docs/README.rst

@@ -3,8 +3,8 @@
 |gh_actions|
 |docs|
 
-``tractor`` is a `structured concurrent`_, (optionally
-distributed_) multi-processing_ runtime built on trio_.
+``tractor`` is a `structured concurrent`_, multi-processing_ runtime
+built on trio_.
 
 Fundamentally, ``tractor`` gives you parallelism via
 ``trio``-"*actors*": independent Python processes (aka
@@ -17,20 +17,11 @@ protocol" constructed on top of multiple Pythons each running a ``trio``
 scheduled runtime - a call to ``trio.run()``.
 
 We believe the system adheres to the `3 axioms`_ of an "`actor model`_"
-but likely **does not** look like what **you** probably *think* an "actor
-model" looks like, and that's **intentional**.
+but likely *does not* look like what *you* probably think an "actor
+model" looks like, and that's *intentional*.
 
-
-Where do i start!?
-------------------
-The first step to grok ``tractor`` is to get an intermediate
-knowledge of ``trio`` and **structured concurrency** B)
-
-Some great places to start are,
-- the seminal `blog post`_
-- obviously the `trio docs`_
-- wikipedia's nascent SC_ page
-- the fancy diagrams @ libdill-docs_
+The first step to grok ``tractor`` is to get the basics of ``trio`` down.
+A great place to start is the `trio docs`_ and this `blog post`_.
 
 
 Features
@@ -602,7 +593,6 @@ matrix seems too hip, we're also mostly all in the the `trio gitter
 channel`_!
 
 .. _structured concurrent: https://trio.discourse.group/t/concise-definition-of-structured-concurrency/228
-.. _distributed: https://en.wikipedia.org/wiki/Distributed_computing
 .. _multi-processing: https://en.wikipedia.org/wiki/Multiprocessing
 .. _trio: https://github.com/python-trio/trio
 .. _nurseries: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/#nurseries-a-structured-replacement-for-go-statements
@@ -621,9 +611,8 @@ channel`_!
 .. _trio docs: https://trio.readthedocs.io/en/latest/
 .. _blog post: https://vorpus.org/blog/notes-on-structured-concurrency-or-go-statement-considered-harmful/
 .. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _SC: https://en.wikipedia.org/wiki/Structured_concurrency
-.. _libdill-docs: https://sustrik.github.io/libdill/structured-concurrency.html
 .. _structured chadcurrency: https://en.wikipedia.org/wiki/Structured_concurrency
+.. _structured concurrency: https://en.wikipedia.org/wiki/Structured_concurrency
 .. _unrequirements: https://en.wikipedia.org/wiki/Actor_model#Direct_communication_and_asynchrony
 .. _async generators: https://www.python.org/dev/peps/pep-0525/
 .. _trio-parallel: https://github.com/richardsheridan/trio-parallel

examples/advanced_faults/ipc_failure_during_stream.py

@@ -6,59 +6,53 @@ been an outage) and we want to ensure that despite being in debug mode
 actor tree will eventually be cancelled without leaving any zombies.
 
 '''
-from contextlib import asynccontextmanager as acm
-from functools import partial
-
+import trio
 from tractor import (
     open_nursery,
     context,
     Context,
-    ContextCancelled,
     MsgStream,
-    _testing,
 )
-import trio
-import pytest
 
 
-async def break_ipc_then_error(
+async def break_channel_silently_then_error(
     stream: MsgStream,
-    break_ipc_with: str|None = None,
-    pre_close: bool = False,
-):
-    await _testing.break_ipc(
-        stream=stream,
-        method=break_ipc_with,
-        pre_close=pre_close,
-    )
-    async for msg in stream:
-        await stream.send(msg)
-
-    assert 0
-
-
-async def iter_ipc_stream(
-    stream: MsgStream,
-    break_ipc_with: str|None = None,
-    pre_close: bool = False,
 ):
     async for msg in stream:
         await stream.send(msg)
 
+        # XXX: close the channel right after an error is raised
+        # purposely breaking the IPC transport to make sure the parent
+        # doesn't get stuck in debug or hang on the connection join.
+        # this more or less simulates an infinite msg-receive hang on
+        # the other end.
+        await stream._ctx.chan.send(None)
+        assert 0
+
+
+async def close_stream_and_error(
+    stream: MsgStream,
+):
+    async for msg in stream:
+        await stream.send(msg)
+
+        # wipe out channel right before raising
+        await stream._ctx.chan.send(None)
+        await stream.aclose()
+        assert 0
+
 
 @context
 async def recv_and_spawn_net_killers(
 
     ctx: Context,
-    break_ipc_after: bool|int = False,
-    pre_close: bool = False,
+    break_ipc_after: bool | int = False,
 
 ) -> None:
     '''
     Receive stream msgs and spawn some IPC killers mid-stream.
 
     '''
-    broke_ipc: bool = False
     await ctx.started()
     async with (
         ctx.open_stream() as stream,
@@ -66,58 +60,27 @@ async def recv_and_spawn_net_killers(
     ):
         async for i in stream:
             print(f'child echoing {i}')
-            if not broke_ipc:
-                await stream.send(i)
-            else:
-                await trio.sleep(0.01)
-
+            await stream.send(i)
             if (
                 break_ipc_after
-                and
-                i >= break_ipc_after
+                and i > break_ipc_after
             ):
-                broke_ipc = True
-                n.start_soon(
-                    iter_ipc_stream,
-                    stream,
-                )
-                n.start_soon(
-                    partial(
-                        break_ipc_then_error,
-                        stream=stream,
-                        pre_close=pre_close,
-                    )
-                )
-
-
-@acm
-async def stuff_hangin_ctlc(timeout: float = 1) -> None:
-
-    with trio.move_on_after(timeout) as cs:
-        yield timeout
-
-    if cs.cancelled_caught:
-        # pretend to be a user seeing no streaming action
-        # thinking it's a hang, and then hitting ctl-c..
-        print(
-            f"i'm a user on the PARENT side and thingz hangin "
-            f'after timeout={timeout} ???\n\n'
-            'MASHING CTlR-C..!?\n'
-        )
-        raise KeyboardInterrupt
+                '#################################\n'
+                'Simulating child-side IPC BREAK!\n'
+                '#################################'
+                n.start_soon(break_channel_silently_then_error, stream)
+                n.start_soon(close_stream_and_error, stream)
 
 
 async def main(
     debug_mode: bool = False,
     start_method: str = 'trio',
-    loglevel: str = 'cancel',
 
     # by default we break the parent IPC first (if configured to break
     # at all), but this can be changed so the child does first (even if
     # both are set to break).
-    break_parent_ipc_after: int|bool = False,
-    break_child_ipc_after: int|bool = False,
-    pre_close: bool = False,
+    break_parent_ipc_after: int | bool = False,
+    break_child_ipc_after: int | bool = False,
 
 ) -> None:
 
@@ -128,129 +91,60 @@ async def main(
             # NOTE: even debugger is used we shouldn't get
             # a hang since it never engages due to broken IPC
             debug_mode=debug_mode,
-            loglevel=loglevel,
+            loglevel='warning',
 
         ) as an,
     ):
-        sub_name: str = 'chitty_hijo'
         portal = await an.start_actor(
-            sub_name,
+            'chitty_hijo',
             enable_modules=[__name__],
         )
 
-        async with (
-            stuff_hangin_ctlc(timeout=2) as timeout,
-            _testing.expect_ctxc(
-                yay=(
-                    break_parent_ipc_after
-                    or break_child_ipc_after
-                ),
-                # TODO: we CAN'T remove this right?
-                # since we need the ctxc to bubble up from either
-                # the stream API after the `None` msg is sent
-                # (which actually implicitly cancels all remote
-                # tasks in the hijo) or from simluated
-                # KBI-mash-from-user
-                # or should we expect that a KBI triggers the ctxc
-                # and KBI in an eg?
-                reraise=True,
-            ),
+        async with portal.open_context(
+            recv_and_spawn_net_killers,
+            break_ipc_after=break_child_ipc_after,
 
-            portal.open_context(
-                recv_and_spawn_net_killers,
-                break_ipc_after=break_child_ipc_after,
-                pre_close=pre_close,
-            ) as (ctx, sent),
-        ):
-            rx_eoc: bool = False
-            ipc_break_sent: bool = False
+        ) as (ctx, sent):
             async with ctx.open_stream() as stream:
                 for i in range(1000):
 
                     if (
                         break_parent_ipc_after
-                        and
-                        i > break_parent_ipc_after
-                        and
-                        not ipc_break_sent
+                        and i > break_parent_ipc_after
                     ):
                         print(
                             '#################################\n'
-                            'Simulating PARENT-side IPC BREAK!\n'
-                            '#################################\n'
+                            'Simulating parent-side IPC BREAK!\n'
+                            '#################################'
                         )
-
-                        # TODO: other methods? see break func above.
-                        # await stream._ctx.chan.send(None)
-                        # await stream._ctx.chan.transport.stream.send_eof()
-                        await stream._ctx.chan.transport.stream.aclose()
-                        ipc_break_sent = True
+                        await stream._ctx.chan.send(None)
 
                     # it actually breaks right here in the
-                    # mp_spawn/forkserver backends and thus the
-                    # zombie reaper never even kicks in?
-                    try:
-                        print(f'parent sending {i}')
-                        await stream.send(i)
-                    except ContextCancelled as ctxc:
-                        print(
-                            'parent received ctxc on `stream.send()`\n'
-                            f'{ctxc}\n'
-                        )
-                        assert 'root' in ctxc.canceller
-                        assert sub_name in ctx.canceller
+                    # mp_spawn/forkserver backends and thus the zombie
+                    # reaper never even kicks in?
+                    print(f'parent sending {i}')
+                    await stream.send(i)
 
-                        # TODO: is this needed or no?
-                        raise
+                    with trio.move_on_after(2) as cs:
 
-                    except trio.ClosedResourceError:
-                        # NOTE: don't send if we already broke the
-                        # connection to avoid raising a closed-error
-                        # such that we drop through to the ctl-c
-                        # mashing by user.
-                        await trio.sleep(0.01)
-
-                    # timeout: int = 1
-                    # with trio.move_on_after(timeout) as cs:
-                    async with stuff_hangin_ctlc() as timeout:
-                        print(
-                            f'PARENT `stream.receive()` with timeout={timeout}\n'
-                        )
                         # NOTE: in the parent side IPC failure case this
                         # will raise an ``EndOfChannel`` after the child
                         # is killed and sends a stop msg back to it's
                         # caller/this-parent.
-                        try:
-                            rx = await stream.receive()
-                            print(
-                                "I'm a happy PARENT user and echoed to me is\n"
-                                f'{rx}\n'
-                            )
-                        except trio.EndOfChannel:
-                            rx_eoc: bool = True
-                            print('MsgStream got EoC for PARENT')
-                            raise
+                        rx = await stream.receive()
 
-            print(
-                'Streaming finished and we got Eoc.\n'
-                'Canceling `.open_context()` in root with\n'
-                'CTlR-C..'
-            )
-            if rx_eoc:
-                assert stream.closed
-                try:
-                    await stream.send(i)
-                    pytest.fail('stream not closed?')
-                except (
-                    trio.ClosedResourceError,
-                    trio.EndOfChannel,
-                ) as send_err:
-                    if rx_eoc:
-                        assert send_err is stream._eoc
-                    else:
-                        assert send_err is stream._closed
+                        print(f"I'm a happy user and echoed to me is {rx}")
 
-            raise KeyboardInterrupt
+                    if cs.cancelled_caught:
+                        # pretend to be a user seeing no streaming action
+                        # thinking it's a hang, and then hitting ctl-c..
+                        print("YOO i'm a user anddd thingz hangin..")
+
+                print(
+                    "YOO i'm mad send side dun but thingz hangin..\n"
+                    'MASHING CTlR-C Ctl-c..'
+                )
+                raise KeyboardInterrupt
 
 
 if __name__ == '__main__':

examples/debugging/asyncio_bp.py

@@ -1,122 +0,0 @@
-import asyncio
-
-import trio
-import tractor
-from tractor import (
-    to_asyncio,
-    Portal,
-)
-
-
-async def aio_sleep_forever():
-    await asyncio.sleep(float('inf'))
-
-
-async def bp_then_error(
-    to_trio: trio.MemorySendChannel,
-    from_trio: asyncio.Queue,
-
-    raise_after_bp: bool = True,
-
-) -> None:
-
-    # sync with ``trio``-side (caller) task
-    to_trio.send_nowait('start')
-
-    # NOTE: what happens here inside the hook needs some refinement..
-    # => seems like it's still `._debug._set_trace()` but
-    #    we set `Lock.local_task_in_debug = 'sync'`, we probably want
-    #    some further, at least, meta-data about the task/actoq in debug
-    #    in terms of making it clear it's asyncio mucking about.
-    breakpoint()
-
-    # short checkpoint / delay
-    await asyncio.sleep(0.5)
-
-    if raise_after_bp:
-        raise ValueError('blah')
-
-    # TODO: test case with this so that it gets cancelled?
-    else:
-        # XXX NOTE: this is required in order to get the SIGINT-ignored
-        # hang case documented in the module script section!
-        await aio_sleep_forever()
-
-
-@tractor.context
-async def trio_ctx(
-    ctx: tractor.Context,
-    bp_before_started: bool = True,
-):
-
-    # this will block until the ``asyncio`` task sends a "first"
-    # message, see first line in above func.
-    async with (
-
-        to_asyncio.open_channel_from(
-            bp_then_error,
-            raise_after_bp=not bp_before_started,
-        ) as (first, chan),
-
-        trio.open_nursery() as n,
-    ):
-        assert first == 'start'
-
-        if bp_before_started:
-            await tractor.breakpoint()
-
-        await ctx.started(first)
-
-        n.start_soon(
-            to_asyncio.run_task,
-            aio_sleep_forever,
-        )
-        await trio.sleep_forever()
-
-
-async def main(
-    bps_all_over: bool = True,
-
-) -> None:
-
-    async with tractor.open_nursery(
-        debug_mode=True,
-        maybe_enable_greenback=True,
-        # loglevel='devx',
-    ) as n:
-        ptl: Portal = await n.start_actor(
-            'aio_daemon',
-            enable_modules=[__name__],
-            infect_asyncio=True,
-            debug_mode=True,
-            # loglevel='cancel',
-        )
-
-        async with ptl.open_context(
-            trio_ctx,
-            bp_before_started=bps_all_over,
-        ) as (ctx, first):
-
-            assert first == 'start'
-
-            if bps_all_over:
-                await tractor.breakpoint()
-
-            # await trio.sleep_forever()
-            await ctx.cancel()
-            assert 0
-
-        # TODO: case where we cancel from trio-side while asyncio task
-        # has debugger lock?
-        # await ptl.cancel_actor()
-
-
-if __name__ == '__main__':
-
-    # works fine B)
-    trio.run(main)
-
-    # will hang and ignores SIGINT !!
-    # NOTE: you'll need to send a SIGQUIT (via ctl-\) to kill it
-    # manually..
-    # trio.run(main, True)

examples/debugging/debug_mode_hang.py

@@ -1,9 +0,0 @@
-'''
-Reproduce a bug where enabling debug mode for a sub-actor actually causes
-a hang on teardown...
-
-'''
-import asyncio
-
-import trio
-import tractor

examples/debugging/multi_daemon_subactors.py

@@ -4,15 +4,9 @@ import trio
 
 async def breakpoint_forever():
     "Indefinitely re-enter debugger in child actor."
-    try:
-        while True:
-            yield 'yo'
-            await tractor.breakpoint()
-    except BaseException:
-        tractor.log.get_console_log().exception(
-            'Cancelled while trying to enter pause point!'
-        )
-        raise
+    while True:
+        yield 'yo'
+        await tractor.breakpoint()
 
 
 async def name_error():
@@ -25,8 +19,7 @@ async def main():
     """
     async with tractor.open_nursery(
         debug_mode=True,
-        # loglevel='cancel',
-        # loglevel='devx',
+        loglevel='error',
     ) as n:
 
         p0 = await n.start_actor('bp_forever', enable_modules=[__name__])
@@ -39,7 +32,7 @@ async def main():
             try:
                 await p1.run(name_error)
             except tractor.RemoteActorError as rae:
-                assert rae.boxed_type is NameError
+                assert rae.type is NameError
 
             async for i in stream:
 

examples/debugging/multi_nested_subactors_error_up_through_nurseries.py

@@ -45,7 +45,6 @@ async def spawn_until(depth=0):
             )
 
 
-# TODO: notes on the new boxed-relayed errors through proxy actors
 async def main():
     """The main ``tractor`` routine.
 

examples/debugging/multi_subactors.py

@@ -38,7 +38,6 @@ async def main():
     """
     async with tractor.open_nursery(
         debug_mode=True,
-        # loglevel='runtime',
     ) as n:
 
         # Spawn both actors, don't bother with collecting results

examples/debugging/per_actor_debug.py

@@ -23,6 +23,5 @@ async def main():
             n.start_soon(debug_actor.run, die)
             n.start_soon(crash_boi.run, die)
 
-
 if __name__ == '__main__':
     trio.run(main)

examples/debugging/pm_in_subactor.py

@@ -1,56 +0,0 @@
-import trio
-import tractor
-
-
-@tractor.context
-async def name_error(
-    ctx: tractor.Context,
-):
-    '''
-    Raise a `NameError`, catch it and enter `.post_mortem()`, then
-    expect the `._rpc._invoke()` crash handler to also engage.
-
-    '''
-    try:
-        getattr(doggypants)  # noqa (on purpose)
-    except NameError:
-        await tractor.post_mortem()
-        raise
-
-
-async def main():
-    '''
-    Test 3 `PdbREPL` entries:
-      - one in the child due to manual `.post_mortem()`,
-      - another in the child due to runtime RPC crash handling.
-      - final one here in parent from the RAE.
-
-    '''
-    # XXX NOTE: ideally the REPL arrives at this frame in the parent
-    # ONE UP FROM the inner ctx block below!
-    async with tractor.open_nursery(
-        debug_mode=True,
-        # loglevel='cancel',
-    ) as an:
-        p: tractor.Portal = await an.start_actor(
-            'child',
-            enable_modules=[__name__],
-        )
-
-        # XXX should raise `RemoteActorError[NameError]`
-        # AND be the active frame when REPL enters!
-        try:
-            async with p.open_context(name_error) as (ctx, first):
-                assert first
-        except tractor.RemoteActorError as rae:
-            assert rae.boxed_type is NameError
-
-            # manually handle in root's parent task
-            await tractor.post_mortem()
-            raise
-        else:
-            raise RuntimeError('IPC ctx should have remote errored!?')
-
-
-if __name__ == '__main__':
-    trio.run(main)

examples/debugging/root_actor_breakpoint_forever.py

@@ -2,13 +2,10 @@ import trio
 import tractor
 
 
-async def main(
-    registry_addrs: tuple[str, int]|None = None
-):
+async def main():
 
     async with tractor.open_root_actor(
         debug_mode=True,
-        # loglevel='runtime',
     ):
         while True:
             await tractor.breakpoint()

examples/debugging/shield_hang_in_sub.py

@@ -1,81 +0,0 @@
-'''
-Verify we can dump a `stackscope` tree on a hang.
-
-'''
-import os
-import signal
-
-import trio
-import tractor
-
-@tractor.context
-async def start_n_shield_hang(
-    ctx: tractor.Context,
-):
-    # actor: tractor.Actor = tractor.current_actor()
-
-    # sync to parent-side task
-    await ctx.started(os.getpid())
-
-    print('Entering shield sleep..')
-    with trio.CancelScope(shield=True):
-        await trio.sleep_forever()  # in subactor
-
-    # XXX NOTE ^^^ since this shields, we expect
-    # the zombie reaper (aka T800) to engage on
-    # SIGINT from the user and eventually hard-kill
-    # this subprocess!
-
-
-async def main(
-    from_test: bool = False,
-) -> None:
-
-    async with (
-        tractor.open_nursery(
-            debug_mode=True,
-            enable_stack_on_sig=True,
-            # maybe_enable_greenback=False,
-            loglevel='devx',
-        ) as an,
-    ):
-
-        ptl: tractor.Portal  = await an.start_actor(
-            'hanger',
-            enable_modules=[__name__],
-            debug_mode=True,
-        )
-        async with ptl.open_context(
-            start_n_shield_hang,
-        ) as (ctx, cpid):
-
-            _, proc, _ = an._children[ptl.chan.uid]
-            assert cpid == proc.pid
-
-            print(
-                'Yo my child hanging..?\n'
-                'Sending SIGUSR1 to see a tree-trace!\n'
-            )
-
-            # XXX simulate the wrapping test's "user actions"
-            # (i.e. if a human didn't run this manually but wants to
-            # know what they should do to reproduce test behaviour)
-            if from_test:
-                os.kill(
-                    cpid,
-                    signal.SIGUSR1,
-                )
-
-                # simulate user cancelling program
-                await trio.sleep(0.5)
-                os.kill(
-                    os.getpid(),
-                    signal.SIGINT,
-                )
-            else:
-                # actually let user send the ctl-c
-                await trio.sleep_forever()  # in root
-
-
-if __name__ == '__main__':
-    trio.run(main)

examples/debugging/shielded_pause.py

@@ -1,88 +0,0 @@
-import trio
-import tractor
-
-
-async def cancellable_pause_loop(
-    task_status: trio.TaskStatus[trio.CancelScope] = trio.TASK_STATUS_IGNORED
-):
-    with trio.CancelScope() as cs:
-        task_status.started(cs)
-        for _ in range(3):
-            try:
-                # ON first entry, there is no level triggered
-                # cancellation yet, so this cp does a parent task
-                # ctx-switch so that this scope raises for the NEXT
-                # checkpoint we hit.
-                await trio.lowlevel.checkpoint()
-                await tractor.pause()
-
-                cs.cancel()
-
-                # parent should have called `cs.cancel()` by now
-                await trio.lowlevel.checkpoint()
-
-            except trio.Cancelled:
-                print('INSIDE SHIELDED PAUSE')
-                await tractor.pause(shield=True)
-        else:
-            # should raise it again, bubbling up to parent
-            print('BUBBLING trio.Cancelled to parent task-nursery')
-            await trio.lowlevel.checkpoint()
-
-
-async def pm_on_cancelled():
-    async with trio.open_nursery() as tn:
-        tn.cancel_scope.cancel()
-        try:
-            await trio.sleep_forever()
-        except trio.Cancelled:
-            # should also raise `Cancelled` since
-            # we didn't pass `shield=True`.
-            try:
-                await tractor.post_mortem(hide_tb=False)
-            except trio.Cancelled as taskc:
-
-                # should enter just fine, in fact it should
-                # be debugging the internals of the previous
-                # sin-shield call above Bo
-                await tractor.post_mortem(
-                    hide_tb=False,
-                    shield=True,
-                )
-                raise taskc
-
-        else:
-            raise RuntimeError('Dint cancel as expected!?')
-
-
-async def cancelled_before_pause(
-):
-    '''
-    Verify that using a shielded pause works despite surrounding
-    cancellation called state in the calling task.
-
-    '''
-    async with trio.open_nursery() as tn:
-        cs: trio.CancelScope = await tn.start(cancellable_pause_loop)
-        await trio.sleep(0.1)
-
-    assert cs.cancelled_caught
-
-    await pm_on_cancelled()
-
-
-async def main():
-    async with tractor.open_nursery(
-        debug_mode=True,
-    ) as n:
-        portal: tractor.Portal = await n.run_in_actor(
-            cancelled_before_pause,
-        )
-        await portal.result()
-
-        # ensure the same works in the root actor!
-        await pm_on_cancelled()
-
-
-if __name__ == '__main__':
-    trio.run(main)

examples/debugging/subactor_breakpoint.py

@@ -3,20 +3,17 @@ import tractor
 
 
 async def breakpoint_forever():
-    '''
-    Indefinitely re-enter debugger in child actor.
-
-    '''
+    """Indefinitely re-enter debugger in child actor.
+    """
     while True:
         await trio.sleep(0.1)
-        await tractor.pause()
+        await tractor.breakpoint()
 
 
 async def main():
 
     async with tractor.open_nursery(
         debug_mode=True,
-        loglevel='cancel',
     ) as n:
 
         portal = await n.run_in_actor(

examples/debugging/subactor_error.py

@@ -3,26 +3,16 @@ import tractor
 
 
 async def name_error():
-    getattr(doggypants)  # noqa (on purpose)
+    getattr(doggypants)
 
 
 async def main():
     async with tractor.open_nursery(
         debug_mode=True,
-        # loglevel='transport',
-    ) as an:
+    ) as n:
 
-        # TODO: ideally the REPL arrives at this frame in the parent,
-        # ABOVE the @api_frame of `Portal.run_in_actor()` (which
-        # should eventually not even be a portal method ... XD)
-        # await tractor.pause()
-        p: tractor.Portal = await an.run_in_actor(name_error)
-
-        # with this style, should raise on this line
-        await p.result()
-
-        # with this alt style should raise at `open_nusery()`
-        # return await p.result()
+        portal = await n.run_in_actor(name_error)
+        await portal.result()
 
 
 if __name__ == '__main__':

examples/debugging/sync_bp.py

@@ -1,169 +0,0 @@
-from functools import partial
-import time
-
-import trio
-import tractor
-
-# TODO: only import these when not running from test harness?
-# can we detect `pexpect` usage maybe?
-# from tractor.devx._debug import (
-#     get_lock,
-#     get_debug_req,
-# )
-
-
-def sync_pause(
-    use_builtin: bool = False,
-    error: bool = False,
-    hide_tb: bool = True,
-    pre_sleep: float|None = None,
-):
-    if pre_sleep:
-        time.sleep(pre_sleep)
-
-    if use_builtin:
-        breakpoint(hide_tb=hide_tb)
-
-    else:
-        # TODO: maybe for testing some kind of cm style interface
-        # where the `._set_trace()` call doesn't happen until block
-        # exit?
-        # assert get_lock().ctx_in_debug is None
-        # assert get_debug_req().repl is None
-        tractor.pause_from_sync()
-        # assert get_debug_req().repl is None
-
-    if error:
-        raise RuntimeError('yoyo sync code error')
-
-
-@tractor.context
-async def start_n_sync_pause(
-    ctx: tractor.Context,
-):
-    actor: tractor.Actor = tractor.current_actor()
-
-    # sync to parent-side task
-    await ctx.started()
-
-    print(f'Entering `sync_pause()` in subactor: {actor.uid}\n')
-    sync_pause()
-    print(f'Exited `sync_pause()` in subactor: {actor.uid}\n')
-
-
-async def main() -> None:
-    async with (
-        tractor.open_nursery(
-            debug_mode=True,
-            maybe_enable_greenback=True,
-            enable_stack_on_sig=True,
-            # loglevel='warning',
-            # loglevel='devx',
-        ) as an,
-        trio.open_nursery() as tn,
-    ):
-        # just from root task
-        sync_pause()
-
-        p: tractor.Portal  = await an.start_actor(
-            'subactor',
-            enable_modules=[__name__],
-            # infect_asyncio=True,
-            debug_mode=True,
-        )
-
-        # TODO: 3 sub-actor usage cases:
-        # -[x] via a `.open_context()`
-        # -[ ] via a `.run_in_actor()` call
-        # -[ ] via a `.run()`
-        # -[ ] via a `.to_thread.run_sync()` in subactor
-        async with p.open_context(
-            start_n_sync_pause,
-        ) as (ctx, first):
-            assert first is None
-
-            # TODO: handle bg-thread-in-root-actor special cases!
-            #
-            # there are a couple very subtle situations possible here
-            # and they are likely to become more important as cpython
-            # moves to support no-GIL.
-            #
-            # Cases:
-            # 1. root-actor bg-threads that call `.pause_from_sync()`
-            #   whilst an in-tree subactor also is using ` .pause()`.
-            # |_ since the root-actor bg thread can not
-            #   `Lock._debug_lock.acquire_nowait()` without running
-            #   a `trio.Task`, AND because the
-            #   `PdbREPL.set_continue()` is called from that
-            #   bg-thread, we can not `._debug_lock.release()`
-            #   either!
-            #  |_ this results in no actor-tree `Lock` being used
-            #    on behalf of the bg-thread and thus the subactor's
-            #    task and the thread trying to to use stdio
-            #    simultaneously which results in the classic TTY
-            #    clobbering!
-            #
-            # 2. mutiple sync-bg-threads that call
-            #   `.pause_from_sync()` where one is scheduled via
-            #   `Nursery.start_soon(to_thread.run_sync)` in a bg
-            #   task.
-            #
-            #   Due to the GIL, the threads never truly try to step
-            #   through the REPL simultaneously, BUT their `logging`
-            #   and traceback outputs are interleaved since the GIL
-            #   (seemingly) on every REPL-input from the user
-            #   switches threads..
-            #
-            #   Soo, the context switching semantics of the GIL
-            #   result in a very confusing and messy interaction UX
-            #   since eval and (tb) print output is NOT synced to
-            #   each REPL-cycle (like we normally make it via
-            #   a `.set_continue()` callback triggering the
-            #   `Lock.release()`). Ideally we can solve this
-            #   usability issue NOW because this will of course be
-            #   that much more important when eventually there is no
-            #   GIL!
-
-            # XXX should cause double REPL entry and thus TTY
-            # clobbering due to case 1. above!
-            tn.start_soon(
-                partial(
-                    trio.to_thread.run_sync,
-                    partial(
-                        sync_pause,
-                        use_builtin=False,
-                        # pre_sleep=0.5,
-                    ),
-                    abandon_on_cancel=True,
-                    thread_name='start_soon_root_bg_thread',
-                )
-            )
-
-            await tractor.pause()
-
-            # XXX should cause double REPL entry and thus TTY
-            # clobbering due to case 2. above!
-            await trio.to_thread.run_sync(
-                partial(
-                    sync_pause,
-                    # NOTE this already works fine since in the new
-                    # thread the `breakpoint()` built-in is never
-                    # overloaded, thus NO locking is used, HOWEVER
-                    # the case 2. from above still exists!
-                    use_builtin=True,
-                ),
-                # TODO: with this `False` we can hang!??!
-                # abandon_on_cancel=False,
-                abandon_on_cancel=True,
-                thread_name='inline_root_bg_thread',
-            )
-
-        await ctx.cancel()
-
-        # TODO: case where we cancel from trio-side while asyncio task
-        # has debugger lock?
-        await p.cancel_actor()
-
-
-if __name__ == '__main__':
-    trio.run(main)

examples/full_fledged_streaming_service.py

@@ -1,11 +1,6 @@
 import time
 import trio
 import tractor
-from tractor import (
-    ActorNursery,
-    MsgStream,
-    Portal,
-)
 
 
 # this is the first 2 actors, streamer_1 and streamer_2
@@ -17,18 +12,14 @@ async def stream_data(seed):
 
 # this is the third actor; the aggregator
 async def aggregate(seed):
-    '''
-    Ensure that the two streams we receive match but only stream
+    """Ensure that the two streams we receive match but only stream
     a single set of values to the parent.
-
-    '''
-    an: ActorNursery
-    async with tractor.open_nursery() as an:
-        portals: list[Portal] = []
+    """
+    async with tractor.open_nursery() as nursery:
+        portals = []
         for i in range(1, 3):
-
-            # fork/spawn call
-            portal = await an.start_actor(
+            # fork point
+            portal = await nursery.start_actor(
                 name=f'streamer_{i}',
                 enable_modules=[__name__],
             )
@@ -52,11 +43,7 @@ async def aggregate(seed):
         async with trio.open_nursery() as n:
 
             for portal in portals:
-                n.start_soon(
-                    push_to_chan,
-                    portal,
-                    send_chan.clone(),
-                )
+                n.start_soon(push_to_chan, portal, send_chan.clone())
 
             # close this local task's reference to send side
             await send_chan.aclose()
@@ -73,36 +60,26 @@ async def aggregate(seed):
 
             print("FINISHED ITERATING in aggregator")
 
-        await an.cancel()
+        await nursery.cancel()
         print("WAITING on `ActorNursery` to finish")
     print("AGGREGATOR COMPLETE!")
 
 
-async def main() -> list[int]:
-    '''
-    This is the "root" actor's main task's entrypoint.
-
-    By default (and if not otherwise specified) that root process
-    also acts as a "registry actor" / "registrar" on the localhost
-    for the purposes of multi-actor "service discovery".
-
-    '''
-    # yes, a nursery which spawns `trio`-"actors" B)
-    an: ActorNursery
+# this is the main actor and *arbiter*
+async def main():
+    # a nursery which spawns "actors"
     async with tractor.open_nursery(
-        loglevel='cancel',
-        debug_mode=True,
-    ) as an:
+        arbiter_addr=('127.0.0.1', 1616)
+    ) as nursery:
 
         seed = int(1e3)
         pre_start = time.time()
 
-        portal: Portal = await an.start_actor(
+        portal = await nursery.start_actor(
             name='aggregator',
             enable_modules=[__name__],
         )
 
-        stream: MsgStream
         async with portal.open_stream_from(
             aggregate,
             seed=seed,
@@ -111,12 +88,11 @@ async def main() -> list[int]:
             start = time.time()
             # the portal call returns exactly what you'd expect
             # as if the remote "aggregate" function was called locally
-            result_stream: list[int] = []
+            result_stream = []
             async for value in stream:
                 result_stream.append(value)
 
-        cancelled: bool = await portal.cancel_actor()
-        assert cancelled
+        await portal.cancel_actor()
 
         print(f"STREAM TIME = {time.time() - start}")
         print(f"STREAM + SPAWN TIME = {time.time() - pre_start}")

examples/multihost/client.py

@@ -1,63 +0,0 @@
-import tractor
-import trio
-
-
-log = tractor.log.get_console_log(
-    _root_name='my_app',
-    name='client',
-)
-_loglevel: str = 'cancel'
-
-
-async def client_main():
-
-    # enable console logging for our custom app's logger
-    tractor.log.get_console_log(
-        level=_loglevel,
-        _root_name='my_app',
-        name='client',
-    )
-
-    # presuming you can get a ref to the target server RPC-ctx func,
-    # pass it directly as our rpc-ctx endpoint below.
-    from server import proxy_request
-    #
-    # NOTE, see he equiv note in `server.py` explaining why this will
-    # render more or less to `'server:proxy_request'` according to
-    # `tractor.msg.NamespacePath.from_ref(proxy_request)`
-
-    async with (
-        tractor.open_root_actor(
-            name='web_requester',
-            registry_addrs=[('127.0.0.1', 1616)],
-            enable_modules=[],  # since this isn't a service actor
-            loglevel=_loglevel,
-        ),
-
-        # use discovery api to find the server actor on your net
-        # (NOTE, in which case the below registry addr would have to
-        # be the public IP of that host!)
-        # tractor.find_actor(
-        #     name='web_proxier',
-        #     registry_addrs=[('127.0.0.1', 1616)],
-        # ) as portal,
-
-        tractor.wait_for_actor(
-            name='web_proxier',
-            registry_addr=('127.0.0.1', 1616),
-        ) as portal,
-
-        # open an RPC context with the remote actor, thus spawning
-        # a new task implemented as the function defined in the
-        # server code.
-        portal.open_context(
-            proxy_request,
-            address='https://github.com',
-        ) as (ctx, first),
-    ):
-        resp: dict = await ctx.result()
-        print(resp)
-
-
-if __name__ == '__main__':
-    trio.run(client_main)

examples/multihost/server.py

@@ -1,91 +0,0 @@
-import httpx
-import tractor
-import trio
-
-log = tractor.log.get_console_log(
-    _root_name='my_app',
-    name='server_thingy',
-)
-
-
-@tractor.context
-async def proxy_request(
-    ctx: tractor.Context,
-    address: str,
-):
-    log.info(
-        'Rxed client request\n'
-        f'{address}\n'
-    )
-    async with httpx.AsyncClient() as client:
-        await ctx.started()  # signal the remote task has started its client
-        log.info(
-            'Opened `httpx` client..'
-        )
-
-        resp: httpx.Response = await client.get(address)  # do the proxied request, get response.
-        log.info(
-            'Got response..\n'
-            f'{resp}\n'
-        )
-
-        # only breaking this up to clarify that you didn't have to only return a single result you could have opened
-        # a long lived stream to avoid task spawning overhead in this service actor.. but more on that later..
-        #
-        # NOTEs, cast to `str` here since we can't serialize the
-        # response type for the wire directly, at least no without
-        # a custom `msgspec.Decoder`!!
-        return str(resp)
-
-        # return resp
-        # ^TODO, various typed msging options:
-        # -[ ] try returning just the `resp` verbatim => should raise
-        #    an MTE
-        # -[ ] try defining a custom `Response` msg to proxy the orig
-        #     types fields and/or a decoder to serialize it?
-
-
-async def main():
-
-    # enable console logging for our custom app's logger
-    tractor.log.get_console_log(
-        level='info',
-        _root_name='my_app',
-        name='server_thingy',
-    )
-
-    # since (originally) this is run as a script, we will end up with
-    # `__name__ == '__main__'` so to ensure the rpc request from the
-    # client isn't blocked by `tractor.ModuleNotFound`, we want to just
-    # use the explicit file-as-module name.. why u ask?
-    this_mod: str = 'server'
-    # WELP, when the `Portal.open_context()` api (used in
-    # `client.py`) requests the RPC-ctx ep it will send
-    # a `str`-like-ptr encoding the func-ref in form expected by
-    # `pkgutil.resolve_name()`.
-    #
-    # Since the client's local namespace reference/path to this
-    # `.server.py` mod will be from a direct manual import, that
-    # `proxy_request()`-ref will render as `'server:proxy_request'`
-    # (as delivered from `NamespacePath.from_ref()` since that's how
-    # `.open_context()` serializes the func's-ref for IPC transit).
-    # SO, we need to be sure we "enable" this module name so that the
-    # nsp maps to an enabled module in the `Actor._mods: dict`.
-
-    async with tractor.open_root_actor(
-        name='web_proxier',
-        registry_addrs=[('127.0.0.1', 1616)],
-        enable_modules=[this_mod],
-        loglevel='info',
-    ):
-        # just block waiting for a peer actor to connect and open an
-        # RPC context using the above proxy endpoint.
-        log.info(
-            'proxy server up bby!\n'
-            'waiting to serve some requests..\n'
-        )
-        await trio.sleep_forever()
-
-
-if __name__ == '__main__':
-    trio.run(main)

examples/parallelism/concurrent_actors_primes.py

@@ -8,10 +8,7 @@ This uses no extra threads, fancy semaphores or futures; all we need
 is ``tractor``'s channels.
 
 """
-from contextlib import (
-    asynccontextmanager as acm,
-    aclosing,
-)
+from contextlib import asynccontextmanager
 from typing import Callable
 import itertools
 import math
@@ -19,6 +16,7 @@ import time
 
 import tractor
 import trio
+from async_generator import aclosing
 
 
 PRIMES = [
@@ -46,7 +44,7 @@ async def is_prime(n):
     return True
 
 
-@acm
+@asynccontextmanager
 async def worker_pool(workers=4):
     """Though it's a trivial special case for ``tractor``, the well
     known "worker pool" seems to be the defacto "but, I want this

examples/rpc_bidir_streaming.py

@@ -13,7 +13,7 @@ async def simple_rpc(
 
     '''
     # signal to parent that we're up much like
-    # ``trio.TaskStatus.started()``
+    # ``trio_typing.TaskStatus.started()``
     await ctx.started(data + 1)
 
     async with ctx.open_stream() as stream:

examples/service_discovery.py

@@ -9,7 +9,7 @@ async def main(service_name):
     async with tractor.open_nursery() as an:
         await an.start_actor(service_name)
 
-        async with tractor.get_registry('127.0.0.1', 1616) as portal:
+        async with tractor.get_arbiter('127.0.0.1', 1616) as portal:
             print(f"Arbiter is listening on {portal.channel}")
 
         async with tractor.wait_for_actor(service_name) as sockaddr:

pyproject.toml

@@ -1,72 +1,3 @@
-[build-system]
-requires = ["poetry-core"]
-build-backend = "poetry.core.masonry.api"
-
-# ------ - ------
-
-[tool.poetry]
-name = "tractor"
-version = "0.1.0a6dev0"
-description='structured concurrent `trio`-"actors"'
-authors = ["Tyler Goodlet <goodboy_foss@protonmail.com>"]
-license = "AGPlv3"
-readme = "docs/README.rst"
-
-# TODO: do we need this xontrib loader at all given pep420
-# and xonsh's xontrib global-autoload-via-setuptools?
-# https://xon.sh/tutorial_xontrib.html#authoring-xontribs
-packages = [
-  {include = 'tractor' },
-  # {include = 'tractor.experimental' },
-  # {include = 'tractor.trionics' },
-  # {include = 'tractor.msg' },
-  # {include = 'tractor.devx' },
-]
-
-# ------ - ------
-
-[tool.poetry.dependencies]
-python = "^3.11"
-
-# trio runtime related
-# proper range spec:
-# https://packaging.python.org/en/latest/discussions/install-requires-vs-requirements/#id5
-trio='^0.24'
-tricycle = "^0.4.1"
-trio-typing = "^0.10.0"
-
-msgspec='^0.18.5'  # interchange
-wrapt = "^1.16.0"  # decorators
-colorlog = "^6.8.2"  # logging
-
-# built-in multi-actor `pdb` REPL
-pdbp = "^1.5.0"
-
-
-# TODO: distributed transport using
-# linux kernel networking
-# 'pyroute2
-
-# ------ - ------
-
-[tool.poetry.group.dev]
-optional = false
-[tool.poetry.group.dev.dependencies]
-# testing
-pytest = "^8.2.0"
-pexpect = "^4.9.0"
-
-# .devx tooling
-greenback = "^1.2.1"
-stackscope = "^0.2.2"
-
-# (light) xonsh usage/integration
-xontrib-vox = "^0.0.1"
-prompt-toolkit = "^3.0.43"
-xonsh-vox-tabcomplete = "^0.5"
-
-# ------ - ------
-
 [tool.towncrier]
 package = "tractor"
 filename = "NEWS.rst"
@@ -95,47 +26,3 @@ all_bullets = true
   directory = "trivial"
   name = "Trivial/Internal Changes"
   showcontent = true
-
-# ------ - ------
-
-[tool.pytest.ini_options]
-minversion = '6.0'
-testpaths = [
-  'tests'
-]
-addopts = [
-  # TODO: figure out why this isn't working..
-  '--rootdir=./tests',
-
-  '--import-mode=importlib',
-  # don't show frickin captured logs AGAIN in the report..
-  '--show-capture=no',
-]
-log_cli = false
-
-# TODO: maybe some of these layout choices?
-# https://docs.pytest.org/en/8.0.x/explanation/goodpractices.html#choosing-a-test-layout-import-rules
-# pythonpath = "src"
-
-# ------ - ------
-
-[project]
-keywords = [
-  'trio',
-  'async',
-  'concurrency',
-  'structured concurrency',
-  'actor model',
-  'distributed',
-  'multiprocessing'
-]
-classifiers = [
-  "Development Status :: 3 - Alpha",
-  "Operating System :: POSIX :: Linux",
-  "Framework :: Trio",
-  "License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)",
-  "Programming Language :: Python :: Implementation :: CPython",
-  "Programming Language :: Python :: 3 :: Only",
-  "Programming Language :: Python :: 3.11",
-  "Topic :: System :: Distributed Computing",
-]

requirements-test.txt

@@ -6,4 +6,3 @@ mypy
 trio_typing
 pexpect
 towncrier
-numpy

setup.py

@@ -26,7 +26,7 @@ with open('docs/README.rst', encoding='utf-8') as f:
 setup(
     name="tractor",
     version='0.1.0a6dev0',  # alpha zone
-    description='structured concurrent `trio`-"actors"',
+    description='structured concurrrent `trio`-"actors"',
     long_description=readme,
     license='AGPLv3',
     author='Tyler Goodlet',
@@ -36,44 +36,41 @@ setup(
     platforms=['linux', 'windows'],
     packages=[
         'tractor',
-        'tractor.experimental',  # wacky ideas
-        'tractor.trionics',  # trio extensions
-        'tractor.msg',  # lowlevel data types
-        'tractor.devx',  # "dev-experience"
+        'tractor.experimental',
+        'tractor.trionics',
     ],
     install_requires=[
 
         # trio related
         # proper range spec:
         # https://packaging.python.org/en/latest/discussions/install-requires-vs-requirements/#id5
-        'trio >= 0.24',
-
-        # 'async_generator',  # in stdlib mostly!
-        # 'trio_typing',  # trio==0.23.0 has type hints!
-        # 'exceptiongroup',  # in stdlib as of 3.11!
+        'trio >= 0.22',
+        'async_generator',
+        'trio_typing',
+        'exceptiongroup',
 
         # tooling
-        'stackscope',
         'tricycle',
         'trio_typing',
         'colorlog',
         'wrapt',
 
         # IPC serialization
-        'msgspec>=0.18.5',
+        'msgspec',
 
         # debug mode REPL
         'pdbp',
 
-        # TODO: distributed transport using
-        # linux kernel networking
-        # 'pyroute2',
-
         # pip ref docs on these specs:
         # https://pip.pypa.io/en/stable/reference/requirement-specifiers/#examples
         # and pep:
         # https://peps.python.org/pep-0440/#version-specifiers
 
+        # windows deps workaround for ``pdbpp``
+        # https://github.com/pdbpp/pdbpp/issues/498
+        # https://github.com/pdbpp/fancycompleter/issues/37
+        'pyreadline3 ; platform_system == "Windows"',
+
     ],
     tests_require=['pytest'],
     python_requires=">=3.10",

tests/conftest.py

@@ -7,19 +7,94 @@ import os
 import random
 import signal
 import platform
+import pathlib
 import time
+import inspect
+from functools import partial, wraps
 
 import pytest
+import trio
 import tractor
-from tractor._testing import (
-    examples_dir as examples_dir,
-    tractor_test as tractor_test,
-    expect_ctxc as expect_ctxc,
-)
 
-# TODO: include wtv plugin(s) we build in `._testing.pytest`?
 pytest_plugins = ['pytester']
 
+
+def tractor_test(fn):
+    """
+    Use:
+
+    @tractor_test
+    async def test_whatever():
+        await ...
+
+    If fixtures:
+
+        - ``arb_addr`` (a socket addr tuple where arbiter is listening)
+        - ``loglevel`` (logging level passed to tractor internals)
+        - ``start_method`` (subprocess spawning backend)
+
+    are defined in the `pytest` fixture space they will be automatically
+    injected to tests declaring these funcargs.
+    """
+    @wraps(fn)
+    def wrapper(
+        *args,
+        loglevel=None,
+        arb_addr=None,
+        start_method=None,
+        **kwargs
+    ):
+        # __tracebackhide__ = True
+
+        if 'arb_addr' in inspect.signature(fn).parameters:
+            # injects test suite fixture value to test as well
+            # as `run()`
+            kwargs['arb_addr'] = arb_addr
+
+        if 'loglevel' in inspect.signature(fn).parameters:
+            # allows test suites to define a 'loglevel' fixture
+            # that activates the internal logging
+            kwargs['loglevel'] = loglevel
+
+        if start_method is None:
+            if platform.system() == "Windows":
+                start_method = 'trio'
+
+        if 'start_method' in inspect.signature(fn).parameters:
+            # set of subprocess spawning backends
+            kwargs['start_method'] = start_method
+
+        if kwargs:
+
+            # use explicit root actor start
+
+            async def _main():
+                async with tractor.open_root_actor(
+                    # **kwargs,
+                    arbiter_addr=arb_addr,
+                    loglevel=loglevel,
+                    start_method=start_method,
+
+                    # TODO: only enable when pytest is passed --pdb
+                    # debug_mode=True,
+
+                ):
+                    await fn(*args, **kwargs)
+
+            main = _main
+
+        else:
+            # use implicit root actor start
+            main = partial(fn, *args, **kwargs)
+
+        return trio.run(main)
+
+    return wrapper
+
+
+_arb_addr = '127.0.0.1', random.randint(1000, 9999)
+
+
 # Sending signal.SIGINT on subprocess fails on windows. Use CTRL_* alternatives
 if platform.system() == 'Windows':
     _KILL_SIGNAL = signal.CTRL_BREAK_EVENT
@@ -39,45 +114,41 @@ no_windows = pytest.mark.skipif(
 )
 
 
+def repodir() -> pathlib.Path:
+    '''
+    Return the abspath to the repo directory.
+
+    '''
+    # 2 parents up to step up through tests/<repo_dir>
+    return pathlib.Path(__file__).parent.parent.absolute()
+
+
+def examples_dir() -> pathlib.Path:
+    '''
+    Return the abspath to the examples directory as `pathlib.Path`.
+
+    '''
+    return repodir() / 'examples'
+
+
 def pytest_addoption(parser):
     parser.addoption(
-        "--ll",
-        action="store",
-        dest='loglevel',
+        "--ll", action="store", dest='loglevel',
         default='ERROR', help="logging level to set when testing"
     )
 
     parser.addoption(
-        "--spawn-backend",
-        action="store",
-        dest='spawn_backend',
+        "--spawn-backend", action="store", dest='spawn_backend',
         default='trio',
         help="Processing spawning backend to use for test run",
     )
 
-    parser.addoption(
-        "--tpdb", "--debug-mode",
-        action="store_true",
-        dest='tractor_debug_mode',
-        # default=False,
-        help=(
-            'Enable a flag that can be used by tests to to set the '
-            '`debug_mode: bool` for engaging the internal '
-            'multi-proc debugger sys.'
-        ),
-    )
-
 
 def pytest_configure(config):
     backend = config.option.spawn_backend
     tractor._spawn.try_set_start_method(backend)
 
 
-@pytest.fixture(scope='session')
-def debug_mode(request):
-    return request.config.option.tractor_debug_mode
-
-
 @pytest.fixture(scope='session', autouse=True)
 def loglevel(request):
     orig = tractor.log._default_loglevel
@@ -97,35 +168,14 @@ _ci_env: bool = os.environ.get('CI', False)
 
 @pytest.fixture(scope='session')
 def ci_env() -> bool:
-    '''
-    Detect CI envoirment.
-
-    '''
+    """Detect CI envoirment.
+    """
     return _ci_env
 
 
-# TODO: also move this to `._testing` for now?
-# -[ ] possibly generalize and re-use for multi-tree spawning
-#    along with the new stuff for multi-addrs in distribute_dis
-#    branch?
-#
-# choose randomly at import time
-_reg_addr: tuple[str, int] = (
-    '127.0.0.1',
-    random.randint(1000, 9999),
-)
-
-
 @pytest.fixture(scope='session')
-def reg_addr() -> tuple[str, int]:
-
-    # globally override the runtime to the per-test-session-dynamic
-    # addr so that all tests never conflict with any other actor
-    # tree using the default.
-    from tractor import _root
-    _root._default_lo_addrs = [_reg_addr]
-
-    return _reg_addr
+def arb_addr():
+    return _arb_addr
 
 
 def pytest_generate_tests(metafunc):
@@ -162,40 +212,34 @@ def sig_prog(proc, sig):
     assert ret
 
 
-# TODO: factor into @cm and move to `._testing`?
 @pytest.fixture
 def daemon(
     loglevel: str,
     testdir,
-    reg_addr: tuple[str, int],
+    arb_addr: tuple[str, int],
 ):
     '''
-    Run a daemon root actor as a separate actor-process tree and
-    "remote registrar" for discovery-protocol related tests.
+    Run a daemon actor as a "remote arbiter".
 
     '''
     if loglevel in ('trace', 'debug'):
-        # XXX: too much logging will lock up the subproc (smh)
-        loglevel: str = 'info'
+        # too much logging will lock up the subproc (smh)
+        loglevel = 'info'
 
-    code: str = (
-            "import tractor; "
-            "tractor.run_daemon([], registry_addrs={reg_addrs}, loglevel={ll})"
-    ).format(
-        reg_addrs=str([reg_addr]),
-        ll="'{}'".format(loglevel) if loglevel else None,
-    )
-    cmd: list[str] = [
-        sys.executable,
-        '-c', code,
+    cmdargs = [
+        sys.executable, '-c',
+        "import tractor; tractor.run_daemon([], registry_addr={}, loglevel={})"
+        .format(
+            arb_addr,
+            "'{}'".format(loglevel) if loglevel else None)
     ]
-    kwargs = {}
+    kwargs = dict()
     if platform.system() == 'Windows':
         # without this, tests hang on windows forever
         kwargs['creationflags'] = subprocess.CREATE_NEW_PROCESS_GROUP
 
     proc = testdir.popen(
-        cmd,
+        cmdargs,
         stdout=subprocess.PIPE,
         stderr=subprocess.PIPE,
         **kwargs,

tests/devx/conftest.py

@@ -1,168 +0,0 @@
-'''
-`tractor.devx.*` tooling sub-pkg test space.
-
-'''
-from typing import (
-    Callable,
-)
-
-import pytest
-from pexpect.exceptions import (
-    TIMEOUT,
-)
-from pexpect.spawnbase import SpawnBase
-from tractor._testing import (
-    mk_cmd,
-)
-
-
-@pytest.fixture
-def spawn(
-    start_method,
-    testdir: pytest.Testdir,
-    reg_addr: tuple[str, int],
-
-) -> Callable[[str], None]:
-    '''
-    Use the `pexpect` module shipped via `testdir.spawn()` to
-    run an `./examples/..` script by name.
-
-    '''
-    if start_method != 'trio':
-        pytest.skip(
-            '`pexpect` based tests only supported on `trio` backend'
-        )
-
-    def _spawn(
-        cmd: str,
-        **mkcmd_kwargs,
-    ):
-        return testdir.spawn(
-            cmd=mk_cmd(
-                cmd,
-                **mkcmd_kwargs,
-            ),
-            expect_timeout=3,
-        )
-
-    # such that test-dep can pass input script name.
-    return _spawn
-
-
-@pytest.fixture(
-    params=[False, True],
-    ids='ctl-c={}'.format,
-)
-def ctlc(
-    request,
-    ci_env: bool,
-
-) -> bool:
-
-    use_ctlc = request.param
-
-    node = request.node
-    markers = node.own_markers
-    for mark in markers:
-        if mark.name == 'has_nested_actors':
-            pytest.skip(
-                f'Test {node} has nested actors and fails with Ctrl-C.\n'
-                f'The test can sometimes run fine locally but until'
-                ' we solve' 'this issue this CI test will be xfail:\n'
-                'https://github.com/goodboy/tractor/issues/320'
-            )
-
-    if use_ctlc:
-        # XXX: disable pygments highlighting for auto-tests
-        # since some envs (like actions CI) will struggle
-        # the the added color-char encoding..
-        from tractor.devx._debug import TractorConfig
-        TractorConfig.use_pygements = False
-
-    yield use_ctlc
-
-
-def expect(
-    child,
-
-    # normally a `pdb` prompt by default
-    patt: str,
-
-    **kwargs,
-
-) -> None:
-    '''
-    Expect wrapper that prints last seen console
-    data before failing.
-
-    '''
-    try:
-        child.expect(
-            patt,
-            **kwargs,
-        )
-    except TIMEOUT:
-        before = str(child.before.decode())
-        print(before)
-        raise
-
-
-def in_prompt_msg(
-    child: SpawnBase,
-    parts: list[str],
-
-    pause_on_false: bool = False,
-    err_on_false: bool = False,
-    print_prompt_on_false: bool = True,
-
-) -> bool:
-    '''
-    Predicate check if (the prompt's) std-streams output has all
-    `str`-parts in it.
-
-    Can be used in test asserts for bulk matching expected
-    log/REPL output for a given `pdb` interact point.
-
-    '''
-    __tracebackhide__: bool = False
-
-    before: str = str(child.before.decode())
-    for part in parts:
-        if part not in before:
-            if pause_on_false:
-                import pdbp
-                pdbp.set_trace()
-
-            if print_prompt_on_false:
-                print(before)
-
-            if err_on_false:
-                raise ValueError(
-                    f'Could not find pattern in `before` output?\n'
-                    f'part: {part!r}\n'
-                )
-            return False
-
-    return True
-
-
-# TODO: todo support terminal color-chars stripping so we can match
-# against call stack frame output from the the 'll' command the like!
-# -[ ] SO answer for stipping ANSI codes: https://stackoverflow.com/a/14693789
-def assert_before(
-    child: SpawnBase,
-    patts: list[str],
-
-    **kwargs,
-
-) -> None:
-    __tracebackhide__: bool = False
-
-    assert in_prompt_msg(
-        child=child,
-        parts=patts,
-
-        # since this is an "assert" helper ;)
-        err_on_false=True,
-        **kwargs
-    )

tests/devx/test_tooling.py

@@ -1,120 +0,0 @@
-'''
-That "native" runtime-hackin toolset better be dang useful!
-
-Verify the funtion of a variety of "developer-experience" tools we
-offer from the `.devx` sub-pkg:
-
-- use of the lovely `stackscope` for dumping actor `trio`-task trees
-  during operation and hangs.
-
-TODO:
-- demonstration of `CallerInfo` call stack frame filtering such that
-  for logging and REPL purposes a user sees exactly the layers needed
-  when debugging a problem inside the stack vs. in their app.
-
-'''
-import os
-import signal
-
-from .conftest import (
-    expect,
-    assert_before,
-    # in_prompt_msg,
-)
-
-
-def test_shield_pause(
-    spawn,
-):
-    '''
-    Verify the `tractor.pause()/.post_mortem()` API works inside an
-    already cancelled `trio.CancelScope` and that you can step to the
-    next checkpoint wherein the cancelled will get raised.
-
-    '''
-    child = spawn(
-        'shield_hang_in_sub'
-    )
-    expect(
-        child,
-        'Yo my child hanging..?',
-    )
-    assert_before(
-        child,
-        [
-            'Entering shield sleep..',
-            'Enabling trace-trees on `SIGUSR1` since `stackscope` is installed @',
-        ]
-    )
-
-    print(
-        'Sending SIGUSR1 to see a tree-trace!',
-    )
-    os.kill(
-        child.pid,
-        signal.SIGUSR1,
-    )
-    expect(
-        child,
-        # end-of-tree delimiter
-        "------ \('root', ",
-    )
-
-    assert_before(
-        child,
-        [
-            'Trying to dump `stackscope` tree..',
-            'Dumping `stackscope` tree for actor',
-            "('root'",  # uid line
-
-            # parent block point (non-shielded)
-            'await trio.sleep_forever()  # in root',
-        ]
-    )
-
-    # expect(
-    #     child,
-    #     # relay to the sub should be reported
-    #     'Relaying `SIGUSR1`[10] to sub-actor',
-    # )
-
-    expect(
-        child,
-        # end-of-tree delimiter
-        "------ \('hanger', ",
-    )
-    assert_before(
-        child,
-        [
-            # relay to the sub should be reported
-            'Relaying `SIGUSR1`[10] to sub-actor',
-
-            "('hanger'",  # uid line
-
-            # hanger LOC where it's shield-halted
-            'await trio.sleep_forever()  # in subactor',
-        ]
-    )
-    # breakpoint()
-
-    # simulate the user sending a ctl-c to the hanging program.
-    # this should result in the terminator kicking in since
-    # the sub is shield blocking and can't respond to SIGINT.
-    os.kill(
-        child.pid,
-        signal.SIGINT,
-    )
-    expect(
-        child,
-        'Shutting down actor runtime',
-        timeout=6,
-    )
-    assert_before(
-        child,
-        [
-            'raise KeyboardInterrupt',
-            # 'Shutting down actor runtime',
-            '#T-800 deployed to collect zombie B0',
-            "'--uid', \"('hanger',",
-        ]
-    )

tests/test_advanced_faults.py

@@ -3,30 +3,22 @@ Sketchy network blackoutz, ugly byzantine gens, puedes eschuchar la
 cancelacion?..
 
 '''
-import itertools
 from functools import partial
-from types import ModuleType
 
 import pytest
 from _pytest.pathlib import import_path
 import trio
 import tractor
-from tractor._testing import (
+
+from conftest import (
     examples_dir,
-    break_ipc,
 )
 
 
 @pytest.mark.parametrize(
-    'pre_aclose_msgstream',
-    [
-        False,
-        True,
-    ],
-    ids=[
-        'no_msgstream_aclose',
-        'pre_aclose_msgstream',
-    ],
+    'debug_mode',
+    [False, True],
+    ids=['no_debug_mode', 'debug_mode'],
 )
 @pytest.mark.parametrize(
     'ipc_break',
@@ -71,10 +63,8 @@ from tractor._testing import (
 )
 def test_ipc_channel_break_during_stream(
     debug_mode: bool,
-    loglevel: str,
     spawn_backend: str,
-    ipc_break: dict|None,
-    pre_aclose_msgstream: bool,
+    ipc_break: dict | None,
 ):
     '''
     Ensure we can have an IPC channel break its connection during
@@ -91,152 +81,72 @@ def test_ipc_channel_break_during_stream(
 
         # non-`trio` spawners should never hit the hang condition that
         # requires the user to do ctl-c to cancel the actor tree.
-        # expect_final_exc = trio.ClosedResourceError
-        expect_final_exc = tractor.TransportClosed
+        expect_final_exc = trio.ClosedResourceError
 
-    mod: ModuleType = import_path(
-        examples_dir() / 'advanced_faults'
-        / 'ipc_failure_during_stream.py',
+    mod = import_path(
+        examples_dir() / 'advanced_faults' / 'ipc_failure_during_stream.py',
         root=examples_dir(),
-        consider_namespace_packages=False,
     )
 
-    # by def we expect KBI from user after a simulated "hang
-    # period" wherein the user eventually hits ctl-c to kill the
-    # root-actor tree.
-    expect_final_exc: BaseException = KeyboardInterrupt
+    expect_final_exc = KeyboardInterrupt
+
+    # when ONLY the child breaks we expect the parent to get a closed
+    # resource error on the next `MsgStream.receive()` and then fail out
+    # and cancel the child from there.
     if (
-        # only expect EoC if trans is broken on the child side,
-        ipc_break['break_child_ipc_after'] is not False
-        # AND we tell the child to call `MsgStream.aclose()`.
-        and pre_aclose_msgstream
-    ):
-        # expect_final_exc = trio.EndOfChannel
-        # ^XXX NOPE! XXX^ since now `.open_stream()` absorbs this
-        # gracefully!
-        expect_final_exc = KeyboardInterrupt
 
-    # NOTE when ONLY the child breaks or it breaks BEFORE the
-    # parent we expect the parent to get a closed resource error
-    # on the next `MsgStream.receive()` and then fail out and
-    # cancel the child from there.
-    #
-    # ONLY CHILD breaks
-    if (
-        ipc_break['break_child_ipc_after']
-        and
-        ipc_break['break_parent_ipc_after'] is False
-    ):
-        # NOTE: we DO NOT expect this any more since
-        # the child side's channel will be broken silently
-        # and nothing on the parent side will indicate this!
-        # expect_final_exc = trio.ClosedResourceError
-
-        # NOTE: child will send a 'stop' msg before it breaks
-        # the transport channel BUT, that will be absorbed by the
-        # `ctx.open_stream()` block and thus the `.open_context()`
-        # should hang, after which the test script simulates
-        # a user sending ctl-c by raising a KBI.
-        if pre_aclose_msgstream:
-            expect_final_exc = KeyboardInterrupt
-
-            # XXX OLD XXX
-            # if child calls `MsgStream.aclose()` then expect EoC.
-            # ^ XXX not any more ^ since eoc is always absorbed
-            # gracefully and NOT bubbled to the `.open_context()`
-            # block!
-            # expect_final_exc = trio.EndOfChannel
-
-    # BOTH but, CHILD breaks FIRST
-    elif (
-        ipc_break['break_child_ipc_after'] is not False
-        and (
-            ipc_break['break_parent_ipc_after']
-            > ipc_break['break_child_ipc_after']
-        )
-    ):
-        if pre_aclose_msgstream:
-            expect_final_exc = KeyboardInterrupt
-
-    # NOTE when the parent IPC side dies (even if the child does as well
-    # but the child fails BEFORE the parent) we always expect the
-    # IPC layer to raise a closed-resource, NEVER do we expect
-    # a stop msg since the parent-side ctx apis will error out
-    # IMMEDIATELY before the child ever sends any 'stop' msg.
-    #
-    # ONLY PARENT breaks
-    elif (
-        ipc_break['break_parent_ipc_after']
-        and
-        ipc_break['break_child_ipc_after'] is False
-    ):
-        # expect_final_exc = trio.ClosedResourceError
-        expect_final_exc = tractor.TransportClosed
-
-    # BOTH but, PARENT breaks FIRST
-    elif (
-        ipc_break['break_parent_ipc_after'] is not False
-        and (
+        # only child breaks
+        (
             ipc_break['break_child_ipc_after']
-            >
+            and ipc_break['break_parent_ipc_after'] is False
+        )
+
+        # both break but, parent breaks first
+        or (
+            ipc_break['break_child_ipc_after'] is not False
+            and (
+                ipc_break['break_parent_ipc_after']
+                > ipc_break['break_child_ipc_after']
+            )
+        )
+
+    ):
+        expect_final_exc = trio.ClosedResourceError
+
+    # when the parent IPC side dies (even if the child's does as well
+    # but the child fails BEFORE the parent) we expect the channel to be
+    # sent a stop msg from the child at some point which will signal the
+    # parent that the stream has been terminated.
+    # NOTE: when the parent breaks "after" the child you get this same
+    # case as well, the child breaks the IPC channel with a stop msg
+    # before any closure takes place.
+    elif (
+        # only parent breaks
+        (
             ipc_break['break_parent_ipc_after']
+            and ipc_break['break_child_ipc_after'] is False
+        )
+
+        # both break but, child breaks first
+        or (
+            ipc_break['break_parent_ipc_after'] is not False
+            and (
+                ipc_break['break_child_ipc_after']
+                > ipc_break['break_parent_ipc_after']
+            )
         )
     ):
-        # expect_final_exc = trio.ClosedResourceError
-        expect_final_exc = tractor.TransportClosed
+        expect_final_exc = trio.EndOfChannel
 
-    with pytest.raises(
-        expected_exception=(
-            expect_final_exc,
-            ExceptionGroup,
-        ),
-    ) as excinfo:
-        try:
-            trio.run(
-                partial(
-                    mod.main,
-                    debug_mode=debug_mode,
-                    start_method=spawn_backend,
-                    loglevel=loglevel,
-                    pre_close=pre_aclose_msgstream,
-                    **ipc_break,
-                )
-            )
-        except KeyboardInterrupt as _kbi:
-            kbi = _kbi
-            if expect_final_exc is not KeyboardInterrupt:
-                pytest.fail(
-                    'Rxed unexpected KBI !?\n'
-                    f'{repr(kbi)}'
-                )
-
-            raise
-
-        except tractor.TransportClosed as _tc:
-            tc = _tc
-            if expect_final_exc is KeyboardInterrupt:
-                pytest.fail(
-                    'Unexpected transport failure !?\n'
-                    f'{repr(tc)}'
-                )
-            cause: Exception = tc.__cause__
-            assert (
-                type(cause) is trio.ClosedResourceError
-                and
-                cause.args[0] == 'another task closed this fd'
-            )
-            raise
-
-    # get raw instance from pytest wrapper
-    value = excinfo.value
-    if isinstance(value, ExceptionGroup):
-        value = next(
-            itertools.dropwhile(
-                lambda exc: not isinstance(exc, expect_final_exc),
-                value.exceptions,
+    with pytest.raises(expect_final_exc):
+        trio.run(
+            partial(
+                mod.main,
+                debug_mode=debug_mode,
+                start_method=spawn_backend,
+                **ipc_break,
             )
         )
-        assert value
 
 
 @tractor.context
@@ -245,15 +155,9 @@ async def break_ipc_after_started(
 ) -> None:
     await ctx.started()
     async with ctx.open_stream() as stream:
-
-        # TODO: make a test which verifies the error
-        # for this, i.e. raises a `MsgTypeError`
-        # await ctx.chan.send(None)
-
-        await break_ipc(
-            stream=stream,
-            pre_close=True,
-        )
+        await stream.aclose()
+        await trio.sleep(0.2)
+        await ctx.chan.send(None)
         print('child broke IPC and terminating')
 
 
@@ -265,29 +169,25 @@ def test_stream_closed_right_after_ipc_break_and_zombie_lord_engages():
 
     '''
     async def main():
-        with trio.fail_after(3):
-            async with tractor.open_nursery() as n:
-                portal = await n.start_actor(
-                    'ipc_breaker',
-                    enable_modules=[__name__],
-                )
+        async with tractor.open_nursery() as n:
+            portal = await n.start_actor(
+                'ipc_breaker',
+                enable_modules=[__name__],
+            )
 
-                with trio.move_on_after(1):
-                    async with (
-                        portal.open_context(
-                            break_ipc_after_started
-                        ) as (ctx, sent),
-                    ):
-                        async with ctx.open_stream():
-                            await trio.sleep(0.5)
+            with trio.move_on_after(1):
+                async with (
+                    portal.open_context(
+                        break_ipc_after_started
+                    ) as (ctx, sent),
+                ):
+                    async with ctx.open_stream():
+                        await trio.sleep(0.5)
 
-                        print('parent waiting on context')
+                    print('parent waiting on context')
 
-                print(
-                    'parent exited context\n'
-                    'parent raising KBI..\n'
-                )
-                raise KeyboardInterrupt
+            print('parent exited context')
+            raise KeyboardInterrupt
 
     with pytest.raises(KeyboardInterrupt):
         trio.run(main)

tests/test_advanced_streaming.py

@@ -6,7 +6,6 @@ from collections import Counter
 import itertools
 import platform
 
-import pytest
 import trio
 import tractor
 
@@ -144,16 +143,8 @@ def test_dynamic_pub_sub():
 
     try:
         trio.run(main)
-    except (
-        trio.TooSlowError,
-        ExceptionGroup,
-    ) as err:
-        if isinstance(err, ExceptionGroup):
-            for suberr in err.exceptions:
-                if isinstance(suberr, trio.TooSlowError):
-                    break
-            else:
-                pytest.fail('Never got a `TooSlowError` ?')
+    except trio.TooSlowError:
+        pass
 
 
 @tractor.context
@@ -307,69 +298,44 @@ async def inf_streamer(
 
     async with (
         ctx.open_stream() as stream,
-        trio.open_nursery() as tn,
+        trio.open_nursery() as n,
     ):
-        async def close_stream_on_sentinel():
+        async def bail_on_sentinel():
             async for msg in stream:
                 if msg == 'done':
-                    print(
-                        'streamer RXed "done" sentinel msg!\n'
-                        'CLOSING `MsgStream`!'
-                    )
                     await stream.aclose()
                 else:
                     print(f'streamer received {msg}')
-            else:
-                print('streamer exited recv loop')
 
         # start termination detector
-        tn.start_soon(close_stream_on_sentinel)
+        n.start_soon(bail_on_sentinel)
 
-        cap: int = 10000  # so that we don't spin forever when bug..
-        for val in range(cap):
+        for val in itertools.count():
             try:
-                print(f'streamer sending {val}')
                 await stream.send(val)
-                if val > cap:
-                    raise RuntimeError(
-                        'Streamer never cancelled by setinel?'
-                    )
-                await trio.sleep(0.001)
-
-            # close out the stream gracefully
             except trio.ClosedResourceError:
-                print('transport closed on streamer side!')
-                assert stream.closed
+                # close out the stream gracefully
                 break
-        else:
-            raise RuntimeError(
-                'Streamer not cancelled before finished sending?'
-            )
 
-    print('streamer exited .open_streamer() block')
+    print('terminating streamer')
 
 
-def test_local_task_fanout_from_stream(
-    debug_mode: bool,
-):
+def test_local_task_fanout_from_stream():
     '''
     Single stream with multiple local consumer tasks using the
     ``MsgStream.subscribe()` api.
 
-    Ensure all tasks receive all values after stream completes
-    sending.
+    Ensure all tasks receive all values after stream completes sending.
 
     '''
-    consumers: int = 22
+    consumers = 22
 
     async def main():
 
         counts = Counter()
 
-        async with tractor.open_nursery(
-            debug_mode=debug_mode,
-        ) as tn:
-            p: tractor.Portal = await tn.start_actor(
+        async with tractor.open_nursery() as tn:
+            p = await tn.start_actor(
                 'inf_streamer',
                 enable_modules=[__name__],
             )
@@ -377,6 +343,7 @@ def test_local_task_fanout_from_stream(
                 p.open_context(inf_streamer) as (ctx, _),
                 ctx.open_stream() as stream,
             ):
+
                 async def pull_and_count(name: str):
                     # name = trio.lowlevel.current_task().name
                     async with stream.subscribe() as recver:
@@ -385,7 +352,7 @@ def test_local_task_fanout_from_stream(
                             tractor.trionics.BroadcastReceiver
                         )
                         async for val in recver:
-                            print(f'bx {name} rx: {val}')
+                            # print(f'{name}: {val}')
                             counts[name] += 1
 
                         print(f'{name} bcaster ended')
@@ -395,14 +362,10 @@ def test_local_task_fanout_from_stream(
                 with trio.fail_after(3):
                     async with trio.open_nursery() as nurse:
                         for i in range(consumers):
-                            nurse.start_soon(
-                                pull_and_count,
-                                i,
-                            )
+                            nurse.start_soon(pull_and_count, i)
 
-                        # delay to let bcast consumers pull msgs
                         await trio.sleep(0.5)
-                        print('terminating nursery of bcast rxer consumers!')
+                        print('\nterminating')
                         await stream.send('done')
 
             print('closed stream connection')

tests/test_cancellation.py

@@ -8,13 +8,15 @@ import platform
 import time
 from itertools import repeat
 
+from exceptiongroup import (
+    BaseExceptionGroup,
+    ExceptionGroup,
+)
 import pytest
 import trio
 import tractor
-from tractor._testing import (
-    tractor_test,
-)
-from conftest import no_windows
+
+from conftest import tractor_test, no_windows
 
 
 def is_win():
@@ -45,19 +47,17 @@ async def do_nuthin():
     ],
     ids=['no_args', 'unexpected_args'],
 )
-def test_remote_error(reg_addr, args_err):
-    '''
-    Verify an error raised in a subactor that is propagated
+def test_remote_error(arb_addr, args_err):
+    """Verify an error raised in a subactor that is propagated
     to the parent nursery, contains the underlying boxed builtin
     error type info and causes cancellation and reraising all the
     way up the stack.
-
-    '''
+    """
     args, errtype = args_err
 
     async def main():
         async with tractor.open_nursery(
-            registry_addrs=[reg_addr],
+            arbiter_addr=arb_addr,
         ) as nursery:
 
             # on a remote type error caused by bad input args
@@ -65,9 +65,7 @@ def test_remote_error(reg_addr, args_err):
             # an exception group outside the nursery since the error
             # here and the far end task error are one in the same?
             portal = await nursery.run_in_actor(
-                assert_err,
-                name='errorer',
-                **args
+                assert_err, name='errorer', **args
             )
 
             # get result(s) from main task
@@ -77,7 +75,7 @@ def test_remote_error(reg_addr, args_err):
                 # of this actor nursery.
                 await portal.result()
             except tractor.RemoteActorError as err:
-                assert err.boxed_type == errtype
+                assert err.type == errtype
                 print("Look Maa that actor failed hard, hehh")
                 raise
 
@@ -86,33 +84,20 @@ def test_remote_error(reg_addr, args_err):
         with pytest.raises(tractor.RemoteActorError) as excinfo:
             trio.run(main)
 
-        assert excinfo.value.boxed_type == errtype
+        assert excinfo.value.type == errtype
 
     else:
-        # the root task will also error on the `Portal.result()`
-        # call so we expect an error from there AND the child.
-        # |_ tho seems like on new `trio` this doesn't always
-        #    happen?
-        with pytest.raises((
-            BaseExceptionGroup,
-            tractor.RemoteActorError,
-        )) as excinfo:
+        # the root task will also error on the `.result()` call
+        # so we expect an error from there AND the child.
+        with pytest.raises(BaseExceptionGroup) as excinfo:
             trio.run(main)
 
-        # ensure boxed errors are `errtype`
-        err: BaseException = excinfo.value
-        if isinstance(err, BaseExceptionGroup):
-            suberrs: list[BaseException] = err.exceptions
-        else:
-            suberrs: list[BaseException] = [err]
-
-        for exc in suberrs:
-            assert exc.boxed_type == errtype
+        # ensure boxed errors
+        for exc in excinfo.value.exceptions:
+            assert exc.type == errtype
 
 
-def test_multierror(
-    reg_addr: tuple[str, int],
-):
+def test_multierror(arb_addr):
     '''
     Verify we raise a ``BaseExceptionGroup`` out of a nursery where
     more then one actor errors.
@@ -120,7 +105,7 @@ def test_multierror(
     '''
     async def main():
         async with tractor.open_nursery(
-            registry_addrs=[reg_addr],
+            arbiter_addr=arb_addr,
         ) as nursery:
 
             await nursery.run_in_actor(assert_err, name='errorer1')
@@ -130,7 +115,7 @@ def test_multierror(
             try:
                 await portal2.result()
             except tractor.RemoteActorError as err:
-                assert err.boxed_type == AssertionError
+                assert err.type == AssertionError
                 print("Look Maa that first actor failed hard, hehh")
                 raise
 
@@ -145,14 +130,14 @@ def test_multierror(
 @pytest.mark.parametrize(
     'num_subactors', range(25, 26),
 )
-def test_multierror_fast_nursery(reg_addr, start_method, num_subactors, delay):
+def test_multierror_fast_nursery(arb_addr, start_method, num_subactors, delay):
     """Verify we raise a ``BaseExceptionGroup`` out of a nursery where
     more then one actor errors and also with a delay before failure
     to test failure during an ongoing spawning.
     """
     async def main():
         async with tractor.open_nursery(
-            registry_addrs=[reg_addr],
+            arbiter_addr=arb_addr,
         ) as nursery:
 
             for i in range(num_subactors):
@@ -182,7 +167,7 @@ def test_multierror_fast_nursery(reg_addr, start_method, num_subactors, delay):
 
     for exc in exceptions:
         assert isinstance(exc, tractor.RemoteActorError)
-        assert exc.boxed_type == AssertionError
+        assert exc.type == AssertionError
 
 
 async def do_nothing():
@@ -190,20 +175,15 @@ async def do_nothing():
 
 
 @pytest.mark.parametrize('mechanism', ['nursery_cancel', KeyboardInterrupt])
-def test_cancel_single_subactor(reg_addr, mechanism):
-    '''
-    Ensure a ``ActorNursery.start_actor()`` spawned subactor
+def test_cancel_single_subactor(arb_addr, mechanism):
+    """Ensure a ``ActorNursery.start_actor()`` spawned subactor
     cancels when the nursery is cancelled.
-
-    '''
+    """
     async def spawn_actor():
-        '''
-        Spawn an actor that blocks indefinitely then cancel via
-        either `ActorNursery.cancel()` or an exception raise.
-
-        '''
+        """Spawn an actor that blocks indefinitely.
+        """
         async with tractor.open_nursery(
-            registry_addrs=[reg_addr],
+            arbiter_addr=arb_addr,
         ) as nursery:
 
             portal = await nursery.start_actor(
@@ -323,7 +303,7 @@ async def test_some_cancels_all(num_actors_and_errs, start_method, loglevel):
                         await portal.run(func, **kwargs)
 
                     except tractor.RemoteActorError as err:
-                        assert err.boxed_type == err_type
+                        assert err.type == err_type
                         # we only expect this first error to propogate
                         # (all other daemons are cancelled before they
                         # can be scheduled)
@@ -342,11 +322,11 @@ async def test_some_cancels_all(num_actors_and_errs, start_method, loglevel):
             assert len(err.exceptions) == num_actors
             for exc in err.exceptions:
                 if isinstance(exc, tractor.RemoteActorError):
-                    assert exc.boxed_type == err_type
+                    assert exc.type == err_type
                 else:
                     assert isinstance(exc, trio.Cancelled)
         elif isinstance(err, tractor.RemoteActorError):
-            assert err.boxed_type == err_type
+            assert err.type == err_type
 
         assert n.cancelled is True
         assert not n._children
@@ -425,7 +405,7 @@ async def test_nested_multierrors(loglevel, start_method):
                     elif isinstance(subexc, tractor.RemoteActorError):
                         # on windows it seems we can't exactly be sure wtf
                         # will happen..
-                        assert subexc.boxed_type in (
+                        assert subexc.type in (
                             tractor.RemoteActorError,
                             trio.Cancelled,
                             BaseExceptionGroup,
@@ -435,7 +415,7 @@ async def test_nested_multierrors(loglevel, start_method):
                         for subsub in subexc.exceptions:
 
                             if subsub in (tractor.RemoteActorError,):
-                                subsub = subsub.boxed_type
+                                subsub = subsub.type
 
                             assert type(subsub) in (
                                 trio.Cancelled,
@@ -450,16 +430,16 @@ async def test_nested_multierrors(loglevel, start_method):
                     # we get back the (sent) cancel signal instead
                     if is_win():
                         if isinstance(subexc, tractor.RemoteActorError):
-                            assert subexc.boxed_type in (
+                            assert subexc.type in (
                                 BaseExceptionGroup,
                                 tractor.RemoteActorError
                             )
                         else:
                             assert isinstance(subexc, BaseExceptionGroup)
                     else:
-                        assert subexc.boxed_type is ExceptionGroup
+                        assert subexc.type is ExceptionGroup
                 else:
-                    assert subexc.boxed_type in (
+                    assert subexc.type in (
                         tractor.RemoteActorError,
                         trio.Cancelled
                     )

tests/test_caps_based_msging.py

@@ -1,917 +0,0 @@
-'''
-Low-level functional audits for our
-"capability based messaging"-spec feats.
-
-B~)
-
-'''
-import typing
-from typing import (
-    Any,
-    Type,
-    Union,
-)
-
-from msgspec import (
-    structs,
-    msgpack,
-    Struct,
-    ValidationError,
-)
-import pytest
-
-import tractor
-from tractor import (
-    _state,
-    MsgTypeError,
-    Context,
-)
-from tractor.msg import (
-    _codec,
-    _ctxvar_MsgCodec,
-
-    NamespacePath,
-    MsgCodec,
-    mk_codec,
-    apply_codec,
-    current_codec,
-)
-from tractor.msg.types import (
-    _payload_msgs,
-    log,
-    PayloadMsg,
-    Started,
-    mk_msg_spec,
-)
-import trio
-
-
-def mk_custom_codec(
-    pld_spec: Union[Type]|Any,
-    add_hooks: bool,
-
-) -> MsgCodec:
-    '''
-    Create custom `msgpack` enc/dec-hooks and set a `Decoder`
-    which only loads `pld_spec` (like `NamespacePath`) types.
-
-    '''
-    uid: tuple[str, str] = tractor.current_actor().uid
-
-    # XXX NOTE XXX: despite defining `NamespacePath` as a type
-    # field on our `PayloadMsg.pld`, we still need a enc/dec_hook() pair
-    # to cast to/from that type on the wire. See the docs:
-    # https://jcristharif.com/msgspec/extending.html#mapping-to-from-native-types
-
-    def enc_nsp(obj: Any) -> Any:
-        print(f'{uid} ENC HOOK')
-        match obj:
-            case NamespacePath():
-                print(
-                    f'{uid}: `NamespacePath`-Only ENCODE?\n'
-                    f'obj-> `{obj}`: {type(obj)}\n'
-                )
-                # if type(obj) != NamespacePath:
-                #     breakpoint()
-                return str(obj)
-
-        print(
-            f'{uid}\n'
-            'CUSTOM ENCODE\n'
-            f'obj-arg-> `{obj}`: {type(obj)}\n'
-        )
-        logmsg: str = (
-            f'{uid}\n'
-            'FAILED ENCODE\n'
-            f'obj-> `{obj}: {type(obj)}`\n'
-        )
-        raise NotImplementedError(logmsg)
-
-    def dec_nsp(
-        obj_type: Type,
-        obj: Any,
-
-    ) -> Any:
-        print(
-            f'{uid}\n'
-            'CUSTOM DECODE\n'
-            f'type-arg-> {obj_type}\n'
-            f'obj-arg-> `{obj}`: {type(obj)}\n'
-        )
-        nsp = None
-
-        if (
-            obj_type is NamespacePath
-            and isinstance(obj, str)
-            and ':' in obj
-        ):
-            nsp = NamespacePath(obj)
-            # TODO: we could built a generic handler using
-            # JUST matching the obj_type part?
-            # nsp = obj_type(obj)
-
-        if nsp:
-            print(f'Returning NSP instance: {nsp}')
-            return nsp
-
-        logmsg: str = (
-            f'{uid}\n'
-            'FAILED DECODE\n'
-            f'type-> {obj_type}\n'
-            f'obj-arg-> `{obj}`: {type(obj)}\n\n'
-            f'current codec:\n'
-            f'{current_codec()}\n'
-        )
-        # TODO: figure out the ignore subsys for this!
-        # -[ ] option whether to defense-relay backc the msg
-        #   inside an `Invalid`/`Ignore`
-        # -[ ] how to make this handling pluggable such that a
-        #   `Channel`/`MsgTransport` can intercept and process
-        #   back msgs either via exception handling or some other
-        #   signal?
-        log.warning(logmsg)
-        # NOTE: this delivers the invalid
-        # value up to `msgspec`'s decoding
-        # machinery for error raising.
-        return obj
-        # raise NotImplementedError(logmsg)
-
-    nsp_codec: MsgCodec = mk_codec(
-        ipc_pld_spec=pld_spec,
-
-        # NOTE XXX: the encode hook MUST be used no matter what since
-        # our `NamespacePath` is not any of a `Any` native type nor
-        # a `msgspec.Struct` subtype - so `msgspec` has no way to know
-        # how to encode it unless we provide the custom hook.
-        #
-        # AGAIN that is, regardless of whether we spec an
-        # `Any`-decoded-pld the enc has no knowledge (by default)
-        # how to enc `NamespacePath` (nsp), so we add a custom
-        # hook to do that ALWAYS.
-        enc_hook=enc_nsp if add_hooks else None,
-
-        # XXX NOTE: pretty sure this is mutex with the `type=` to
-        # `Decoder`? so it won't work in tandem with the
-        # `ipc_pld_spec` passed above?
-        dec_hook=dec_nsp if add_hooks else None,
-    )
-    return nsp_codec
-
-
-def chk_codec_applied(
-    expect_codec: MsgCodec,
-    enter_value: MsgCodec|None = None,
-
-) -> MsgCodec:
-    '''
-    buncha sanity checks ensuring that the IPC channel's
-    context-vars are set to the expected codec and that are
-    ctx-var wrapper APIs match the same.
-
-    '''
-    # TODO: play with tricyle again, bc this is supposed to work
-    # the way we want?
-    #
-    # TreeVar
-    # task: trio.Task = trio.lowlevel.current_task()
-    # curr_codec = _ctxvar_MsgCodec.get_in(task)
-
-    # ContextVar
-    # task_ctx: Context = task.context
-    # assert _ctxvar_MsgCodec in task_ctx
-    # curr_codec: MsgCodec = task.context[_ctxvar_MsgCodec]
-
-    # NOTE: currently we use this!
-    # RunVar
-    curr_codec: MsgCodec = current_codec()
-    last_read_codec = _ctxvar_MsgCodec.get()
-    # assert curr_codec is last_read_codec
-
-    assert (
-        (same_codec := expect_codec) is
-        # returned from `mk_codec()`
-
-        # yielded value from `apply_codec()`
-
-        # read from current task's `contextvars.Context`
-        curr_codec is
-        last_read_codec
-
-        # the default `msgspec` settings
-        is not _codec._def_msgspec_codec
-        is not _codec._def_tractor_codec
-    )
-
-    if enter_value:
-        enter_value is same_codec
-
-
-def iter_maybe_sends(
-    send_items: dict[Union[Type], Any] | list[tuple],
-    ipc_pld_spec: Union[Type] | Any,
-    add_codec_hooks: bool,
-
-    codec: MsgCodec|None = None,
-
-) -> tuple[Any, bool]:
-
-    if isinstance(send_items, dict):
-        send_items = send_items.items()
-
-    for (
-        send_type_spec,
-        send_value,
-    ) in send_items:
-
-        expect_roundtrip: bool = False
-
-        # values-to-typespec santiy
-        send_type = type(send_value)
-        assert send_type == send_type_spec or (
-            (subtypes := getattr(send_type_spec, '__args__', None))
-            and send_type in subtypes
-        )
-
-        spec_subtypes: set[Union[Type]] = (
-             getattr(
-                 ipc_pld_spec,
-                 '__args__',
-                 {ipc_pld_spec,},
-             )
-        )
-        send_in_spec: bool = (
-            send_type == ipc_pld_spec
-            or (
-                ipc_pld_spec != Any
-                and  # presume `Union` of types
-                send_type in spec_subtypes
-            )
-            or (
-                ipc_pld_spec == Any
-                and
-                send_type != NamespacePath
-            )
-        )
-        expect_roundtrip = (
-            send_in_spec
-            # any spec should support all other
-            # builtin py values that we send
-            # except our custom nsp type which
-            # we should be able to send as long
-            # as we provide the custom codec hooks.
-            or (
-                ipc_pld_spec == Any
-                and
-                send_type == NamespacePath
-                and
-                add_codec_hooks
-            )
-        )
-
-        if codec is not None:
-            # XXX FIRST XXX ensure roundtripping works
-            # before touching any IPC primitives/APIs.
-            wire_bytes: bytes = codec.encode(
-                Started(
-                    cid='blahblah',
-                    pld=send_value,
-                )
-            )
-            # NOTE: demonstrates the decoder loading
-            # to via our native SCIPP msg-spec
-            # (structurred-conc-inter-proc-protocol)
-            # implemented as per,
-            try:
-                msg: Started = codec.decode(wire_bytes)
-                if not expect_roundtrip:
-                    pytest.fail(
-                        f'NOT-EXPECTED able to roundtrip value given spec:\n'
-                        f'ipc_pld_spec -> {ipc_pld_spec}\n'
-                        f'value -> {send_value}: {send_type}\n'
-                    )
-
-                pld = msg.pld
-                assert pld == send_value
-
-            except ValidationError:
-                if expect_roundtrip:
-                    pytest.fail(
-                        f'EXPECTED to roundtrip value given spec:\n'
-                        f'ipc_pld_spec -> {ipc_pld_spec}\n'
-                        f'value -> {send_value}: {send_type}\n'
-                    )
-
-        yield (
-            str(send_type),
-            send_value,
-            expect_roundtrip,
-        )
-
-
-def dec_type_union(
-    type_names: list[str],
-) -> Type:
-    '''
-    Look up types by name, compile into a list and then create and
-    return a `typing.Union` from the full set.
-
-    '''
-    import importlib
-    types: list[Type] = []
-    for type_name in type_names:
-        for mod in [
-            typing,
-            importlib.import_module(__name__),
-        ]:
-            if type_ref := getattr(
-                mod,
-                type_name,
-                False,
-            ):
-                types.append(type_ref)
-
-    # special case handling only..
-    # ipc_pld_spec: Union[Type] = eval(
-    #     pld_spec_str,
-    #     {},  # globals
-    #     {'typing': typing},  # locals
-    # )
-
-    return Union[*types]
-
-
-def enc_type_union(
-    union_or_type: Union[Type]|Type,
-) -> list[str]:
-    '''
-    Encode a type-union or single type to a list of type-name-strings
-    ready for IPC interchange.
-
-    '''
-    type_strs: list[str] = []
-    for typ in getattr(
-        union_or_type,
-        '__args__',
-        {union_or_type,},
-    ):
-        type_strs.append(typ.__qualname__)
-
-    return type_strs
-
-
-@tractor.context
-async def send_back_values(
-    ctx: Context,
-    expect_debug: bool,
-    pld_spec_type_strs: list[str],
-    add_hooks: bool,
-    started_msg_bytes: bytes,
-    expect_ipc_send: dict[str, tuple[Any, bool]],
-
-) -> None:
-    '''
-    Setup up a custom codec to load instances of `NamespacePath`
-    and ensure we can round trip a func ref with our parent.
-
-    '''
-    uid: tuple = tractor.current_actor().uid
-
-    # debug mode sanity check (prolly superfluous but, meh)
-    assert expect_debug == _state.debug_mode()
-
-    # init state in sub-actor should be default
-    chk_codec_applied(
-        expect_codec=_codec._def_tractor_codec,
-    )
-
-    # load pld spec from input str
-    ipc_pld_spec = dec_type_union(
-        pld_spec_type_strs,
-    )
-    pld_spec_str = str(ipc_pld_spec)
-
-    # same as on parent side config.
-    nsp_codec: MsgCodec = mk_custom_codec(
-        pld_spec=ipc_pld_spec,
-        add_hooks=add_hooks,
-    )
-    with (
-        apply_codec(nsp_codec) as codec,
-    ):
-        chk_codec_applied(
-            expect_codec=nsp_codec,
-            enter_value=codec,
-        )
-
-        print(
-            f'{uid}: attempting `Started`-bytes DECODE..\n'
-        )
-        try:
-            msg: Started = nsp_codec.decode(started_msg_bytes)
-            expected_pld_spec_str: str = msg.pld
-            assert pld_spec_str == expected_pld_spec_str
-
-        # TODO: maybe we should add our own wrapper error so as to
-        # be interchange-lib agnostic?
-        # -[ ] the error type is wtv is raised from the hook so we
-        #   could also require a type-class of errors for
-        #   indicating whether the hook-failure can be handled by
-        #   a nasty-dialog-unprot sub-sys?
-        except ValidationError:
-
-            # NOTE: only in the `Any` spec case do we expect this to
-            # work since otherwise no spec covers a plain-ol'
-            # `.pld: str`
-            if pld_spec_str == 'Any':
-                raise
-            else:
-                print(
-                    f'{uid}: (correctly) unable to DECODE `Started`-bytes\n'
-                    f'{started_msg_bytes}\n'
-                )
-
-        iter_send_val_items = iter(expect_ipc_send.values())
-        sent: list[Any] = []
-        for send_value, expect_send in iter_send_val_items:
-            try:
-                print(
-                    f'{uid}: attempting to `.started({send_value})`\n'
-                    f'=> expect_send: {expect_send}\n'
-                    f'SINCE, ipc_pld_spec: {ipc_pld_spec}\n'
-                    f'AND, codec: {codec}\n'
-                )
-                await ctx.started(send_value)
-                sent.append(send_value)
-                if not expect_send:
-
-                    # XXX NOTE XXX THIS WON'T WORK WITHOUT SPECIAL
-                    # `str` handling! or special debug mode IPC
-                    # msgs!
-                    await tractor.pause()
-
-                    raise RuntimeError(
-                        f'NOT-EXPECTED able to roundtrip value given spec:\n'
-                        f'ipc_pld_spec -> {ipc_pld_spec}\n'
-                        f'value -> {send_value}: {type(send_value)}\n'
-                    )
-
-                break  # move on to streaming block..
-
-            except tractor.MsgTypeError:
-                await tractor.pause()
-
-                if expect_send:
-                    raise RuntimeError(
-                        f'EXPECTED to `.started()` value given spec:\n'
-                        f'ipc_pld_spec -> {ipc_pld_spec}\n'
-                        f'value -> {send_value}: {type(send_value)}\n'
-                    )
-
-        async with ctx.open_stream() as ipc:
-            print(
-                f'{uid}: Entering streaming block to send remaining values..'
-            )
-
-            for send_value, expect_send in iter_send_val_items:
-                send_type: Type = type(send_value)
-                print(
-                    '------ - ------\n'
-                    f'{uid}: SENDING NEXT VALUE\n'
-                    f'ipc_pld_spec: {ipc_pld_spec}\n'
-                    f'expect_send: {expect_send}\n'
-                    f'val: {send_value}\n'
-                    '------ - ------\n'
-                )
-                try:
-                    await ipc.send(send_value)
-                    print(f'***\n{uid}-CHILD sent {send_value!r}\n***\n')
-                    sent.append(send_value)
-
-                    # NOTE: should only raise above on
-                    # `.started()` or a `Return`
-                    # if not expect_send:
-                    #     raise RuntimeError(
-                    #         f'NOT-EXPECTED able to roundtrip value given spec:\n'
-                    #         f'ipc_pld_spec -> {ipc_pld_spec}\n'
-                    #         f'value -> {send_value}: {send_type}\n'
-                    #     )
-
-                except ValidationError:
-                    print(f'{uid} FAILED TO SEND {send_value}!')
-
-                    # await tractor.pause()
-                    if expect_send:
-                        raise RuntimeError(
-                            f'EXPECTED to roundtrip value given spec:\n'
-                            f'ipc_pld_spec -> {ipc_pld_spec}\n'
-                            f'value -> {send_value}: {send_type}\n'
-                        )
-                    # continue
-
-            else:
-                print(
-                    f'{uid}: finished sending all values\n'
-                    'Should be exiting stream block!\n'
-                )
-
-        print(f'{uid}: exited streaming block!')
-
-        # TODO: this won't be true bc in streaming phase we DO NOT
-        # msgspec check outbound msgs!
-        # -[ ] once we implement the receiver side `InvalidMsg`
-        #   then we can expect it here?
-        # assert (
-        #     len(sent)
-        #     ==
-        #     len([val
-        #          for val, expect in
-        #          expect_ipc_send.values()
-        #          if expect is True])
-        # )
-
-
-def ex_func(*args):
-    print(f'ex_func({args})')
-
-
-@pytest.mark.parametrize(
-    'ipc_pld_spec',
-    [
-        Any,
-        NamespacePath,
-        NamespacePath|None,  # the "maybe" spec Bo
-    ],
-    ids=[
-        'any_type',
-        'nsp_type',
-        'maybe_nsp_type',
-    ]
-)
-@pytest.mark.parametrize(
-    'add_codec_hooks',
-    [
-        True,
-        False,
-    ],
-    ids=['use_codec_hooks', 'no_codec_hooks'],
-)
-def test_codec_hooks_mod(
-    debug_mode: bool,
-    ipc_pld_spec: Union[Type]|Any,
-    # send_value: None|str|NamespacePath,
-    add_codec_hooks: bool,
-):
-    '''
-    Audit the `.msg.MsgCodec` override apis details given our impl
-    uses `contextvars` to accomplish per `trio` task codec
-    application around an inter-proc-task-comms context.
-
-    '''
-    async def main():
-        nsp = NamespacePath.from_ref(ex_func)
-        send_items: dict[Union, Any] = {
-            Union[None]: None,
-            Union[NamespacePath]: nsp,
-            Union[str]: str(nsp),
-        }
-
-        # init default state for actor
-        chk_codec_applied(
-            expect_codec=_codec._def_tractor_codec,
-        )
-
-        async with tractor.open_nursery(
-            debug_mode=debug_mode,
-        ) as an:
-            p: tractor.Portal = await an.start_actor(
-                'sub',
-                enable_modules=[__name__],
-            )
-
-            # TODO: 2 cases:
-            # - codec not modified -> decode nsp as `str`
-            # - codec modified with hooks -> decode nsp as
-            #   `NamespacePath`
-            nsp_codec: MsgCodec = mk_custom_codec(
-                pld_spec=ipc_pld_spec,
-                add_hooks=add_codec_hooks,
-            )
-            with apply_codec(nsp_codec) as codec:
-                chk_codec_applied(
-                    expect_codec=nsp_codec,
-                    enter_value=codec,
-                )
-
-                expect_ipc_send: dict[str, tuple[Any, bool]] = {}
-
-                report: str = (
-                    'Parent report on send values with\n'
-                    f'ipc_pld_spec: {ipc_pld_spec}\n'
-                    '       ------ - ------\n'
-                )
-                for val_type_str, val, expect_send in iter_maybe_sends(
-                    send_items,
-                    ipc_pld_spec,
-                    add_codec_hooks=add_codec_hooks,
-                ):
-                    report += (
-                        f'send_value: {val}: {type(val)} '
-                        f'=> expect_send: {expect_send}\n'
-                    )
-                    expect_ipc_send[val_type_str] = (val, expect_send)
-
-                print(
-                    report +
-                    '       ------ - ------\n'
-                )
-                assert len(expect_ipc_send) == len(send_items)
-                # now try over real IPC with a the subactor
-                # expect_ipc_rountrip: bool = True
-                expected_started = Started(
-                    cid='cid',
-                    pld=str(ipc_pld_spec),
-                )
-                # build list of values we expect to receive from
-                # the subactor.
-                expect_to_send: list[Any] = [
-                    val
-                    for val, expect_send in expect_ipc_send.values()
-                    if expect_send
-                ]
-
-                pld_spec_type_strs: list[str] = enc_type_union(ipc_pld_spec)
-
-                # XXX should raise an mte (`MsgTypeError`)
-                # when `add_codec_hooks == False` bc the input
-                # `expect_ipc_send` kwarg has a nsp which can't be
-                # serialized!
-                #
-                # TODO:can we ensure this happens from the
-                # `Return`-side (aka the sub) as well?
-                if not add_codec_hooks:
-                    try:
-                        async with p.open_context(
-                            send_back_values,
-                            expect_debug=debug_mode,
-                            pld_spec_type_strs=pld_spec_type_strs,
-                            add_hooks=add_codec_hooks,
-                            started_msg_bytes=nsp_codec.encode(expected_started),
-
-                            # XXX NOTE bc we send a `NamespacePath` in this kwarg
-                            expect_ipc_send=expect_ipc_send,
-
-                        ) as (ctx, first):
-                            pytest.fail('ctx should fail to open without custom enc_hook!?')
-
-                    # this test passes bc we can go no further!
-                    except MsgTypeError:
-                        # teardown nursery
-                        await p.cancel_actor()
-                        return
-
-                # TODO: send the original nsp here and
-                # test with `limit_msg_spec()` above?
-                # await tractor.pause()
-                print('PARENT opening IPC ctx!\n')
-                async with (
-
-                    # XXX should raise an mte (`MsgTypeError`)
-                    # when `add_codec_hooks == False`..
-                    p.open_context(
-                        send_back_values,
-                        expect_debug=debug_mode,
-                        pld_spec_type_strs=pld_spec_type_strs,
-                        add_hooks=add_codec_hooks,
-                        started_msg_bytes=nsp_codec.encode(expected_started),
-                        expect_ipc_send=expect_ipc_send,
-                    ) as (ctx, first),
-
-                    ctx.open_stream() as ipc,
-                ):
-                    # ensure codec is still applied across
-                    # `tractor.Context` + its embedded nursery.
-                    chk_codec_applied(
-                        expect_codec=nsp_codec,
-                        enter_value=codec,
-                    )
-                    print(
-                        'root: ENTERING CONTEXT BLOCK\n'
-                        f'type(first): {type(first)}\n'
-                        f'first: {first}\n'
-                    )
-                    expect_to_send.remove(first)
-
-                    # TODO: explicit values we expect depending on
-                    # codec config!
-                    # assert first == first_val
-                    # assert first == f'{__name__}:ex_func'
-
-                    async for next_sent in ipc:
-                        print(
-                            'Parent: child sent next value\n'
-                            f'{next_sent}: {type(next_sent)}\n'
-                        )
-                        if expect_to_send:
-                            expect_to_send.remove(next_sent)
-                        else:
-                            print('PARENT should terminate stream loop + block!')
-
-                    # all sent values should have arrived!
-                    assert not expect_to_send
-
-            await p.cancel_actor()
-
-    trio.run(main)
-
-
-def chk_pld_type(
-    payload_spec: Type[Struct]|Any,
-    pld: Any,
-
-    expect_roundtrip: bool|None = None,
-
-) -> bool:
-
-    pld_val_type: Type = type(pld)
-
-    # TODO: verify that the overridden subtypes
-    # DO NOT have modified type-annots from original!
-    # 'Start',  .pld: FuncSpec
-    # 'StartAck',  .pld: IpcCtxSpec
-    # 'Stop',  .pld: UNSEt
-    # 'Error',  .pld: ErrorData
-
-    codec: MsgCodec = mk_codec(
-        # NOTE: this ONLY accepts `PayloadMsg.pld` fields of a specified
-        # type union.
-        ipc_pld_spec=payload_spec,
-    )
-
-    # make a one-off dec to compare with our `MsgCodec` instance
-    # which does the below `mk_msg_spec()` call internally
-    ipc_msg_spec: Union[Type[Struct]]
-    msg_types: list[PayloadMsg[payload_spec]]
-    (
-        ipc_msg_spec,
-        msg_types,
-    ) = mk_msg_spec(
-        payload_type_union=payload_spec,
-    )
-    _enc = msgpack.Encoder()
-    _dec = msgpack.Decoder(
-        type=ipc_msg_spec or Any,  # like `PayloadMsg[Any]`
-    )
-
-    assert (
-        payload_spec
-        ==
-        codec.pld_spec
-    )
-
-    # assert codec.dec == dec
-    #
-    # ^-XXX-^ not sure why these aren't "equal" but when cast
-    # to `str` they seem to match ?? .. kk
-
-    assert (
-        str(ipc_msg_spec)
-        ==
-        str(codec.msg_spec)
-        ==
-        str(_dec.type)
-        ==
-        str(codec.dec.type)
-    )
-
-    # verify the boxed-type for all variable payload-type msgs.
-    if not msg_types:
-        breakpoint()
-
-    roundtrip: bool|None = None
-    pld_spec_msg_names: list[str] = [
-        td.__name__ for td in _payload_msgs
-    ]
-    for typedef in msg_types:
-
-        skip_runtime_msg: bool = typedef.__name__ not in pld_spec_msg_names
-        if skip_runtime_msg:
-            continue
-
-        pld_field = structs.fields(typedef)[1]
-        assert pld_field.type is payload_spec # TODO-^ does this need to work to get all subtypes to adhere?
-
-        kwargs: dict[str, Any] = {
-            'cid': '666',
-            'pld': pld,
-        }
-        enc_msg: PayloadMsg = typedef(**kwargs)
-
-        _wire_bytes: bytes = _enc.encode(enc_msg)
-        wire_bytes: bytes = codec.enc.encode(enc_msg)
-        assert _wire_bytes == wire_bytes
-
-        ve: ValidationError|None = None
-        try:
-            dec_msg = codec.dec.decode(wire_bytes)
-            _dec_msg = _dec.decode(wire_bytes)
-
-            # decoded msg and thus payload should be exactly same!
-            assert (roundtrip := (
-                _dec_msg
-                ==
-                dec_msg
-                ==
-                enc_msg
-            ))
-
-            if (
-                expect_roundtrip is not None
-                and expect_roundtrip != roundtrip
-            ):
-                breakpoint()
-
-            assert (
-                pld
-                ==
-                dec_msg.pld
-                ==
-                enc_msg.pld
-            )
-            # assert (roundtrip := (_dec_msg == enc_msg))
-
-        except ValidationError as _ve:
-            ve = _ve
-            roundtrip: bool = False
-            if pld_val_type is payload_spec:
-                raise ValueError(
-                   'Got `ValidationError` despite type-var match!?\n'
-                    f'pld_val_type: {pld_val_type}\n'
-                    f'payload_type: {payload_spec}\n'
-                ) from ve
-
-            else:
-                # ow we good cuz the pld spec mismatched.
-                print(
-                    'Got expected `ValidationError` since,\n'
-                    f'{pld_val_type} is not {payload_spec}\n'
-                )
-        else:
-            if (
-                payload_spec is not Any
-                and
-                pld_val_type is not payload_spec
-            ):
-                raise ValueError(
-                   'DID NOT `ValidationError` despite expected type match!?\n'
-                    f'pld_val_type: {pld_val_type}\n'
-                    f'payload_type: {payload_spec}\n'
-                )
-
-    # full code decode should always be attempted!
-    if roundtrip is None:
-        breakpoint()
-
-    return roundtrip
-
-
-def test_limit_msgspec():
-
-    async def main():
-        async with tractor.open_root_actor(
-            debug_mode=True
-        ):
-
-            # ensure we can round-trip a boxing `PayloadMsg`
-            assert chk_pld_type(
-                payload_spec=Any,
-                pld=None,
-                expect_roundtrip=True,
-            )
-
-            # verify that a mis-typed payload value won't decode
-            assert not chk_pld_type(
-                payload_spec=int,
-                pld='doggy',
-            )
-
-            # parametrize the boxed `.pld` type as a custom-struct
-            # and ensure that parametrization propagates
-            # to all payload-msg-spec-able subtypes!
-            class CustomPayload(Struct):
-                name: str
-                value: Any
-
-            assert not chk_pld_type(
-                payload_spec=CustomPayload,
-                pld='doggy',
-            )
-
-            assert chk_pld_type(
-                payload_spec=CustomPayload,
-                pld=CustomPayload(name='doggy', value='urmom')
-            )
-
-            # yah, we can `.pause_from_sync()` now!
-            # breakpoint()
-
-    trio.run(main)

tests/test_child_manages_service_nursery.py

@@ -6,15 +6,14 @@ sub-sub-actor daemons.
 '''
 from typing import Optional
 import asyncio
-from contextlib import (
-    asynccontextmanager as acm,
-    aclosing,
-)
+from contextlib import asynccontextmanager as acm
 
 import pytest
 import trio
+from trio_typing import TaskStatus
 import tractor
 from tractor import RemoteActorError
+from async_generator import aclosing
 
 
 async def aio_streamer(
@@ -142,7 +141,7 @@ async def open_actor_local_nursery(
 )
 def test_actor_managed_trio_nursery_task_error_cancels_aio(
     asyncio_mode: bool,
-    reg_addr: tuple,
+    arb_addr
 ):
     '''
     Verify that a ``trio`` nursery created managed in a child actor
@@ -171,4 +170,4 @@ def test_actor_managed_trio_nursery_task_error_cancels_aio(
 
     # verify boxed error
     err = excinfo.value
-    assert err.boxed_type is NameError
+    assert isinstance(err.type(), NameError)

tests/test_clustering.py

@@ -5,7 +5,9 @@ import trio
 import tractor
 from tractor import open_actor_cluster
 from tractor.trionics import gather_contexts
-from tractor._testing import tractor_test
+
+from conftest import tractor_test
+
 
 MESSAGE = 'tractoring at full speed'
 
@@ -47,7 +49,7 @@ async def worker(
     await ctx.started()
 
     async with ctx.open_stream(
-        allow_overruns=True,
+        backpressure=True,
     ) as stream:
 
         # TODO: this with the below assert causes a hang bug?

tests/test_discovery.py

@@ -9,24 +9,25 @@ import itertools
 
 import pytest
 import tractor
-from tractor._testing import tractor_test
 import trio
 
+from conftest import tractor_test
+
 
 @tractor_test
-async def test_reg_then_unreg(reg_addr):
+async def test_reg_then_unreg(arb_addr):
     actor = tractor.current_actor()
     assert actor.is_arbiter
     assert len(actor._registry) == 1  # only self is registered
 
     async with tractor.open_nursery(
-        registry_addrs=[reg_addr],
+        arbiter_addr=arb_addr,
     ) as n:
 
         portal = await n.start_actor('actor', enable_modules=[__name__])
         uid = portal.channel.uid
 
-        async with tractor.get_registry(*reg_addr) as aportal:
+        async with tractor.get_arbiter(*arb_addr) as aportal:
             # this local actor should be the arbiter
             assert actor is aportal.actor
 
@@ -52,27 +53,15 @@ async def hi():
     return the_line.format(tractor.current_actor().name)
 
 
-async def say_hello(
-    other_actor: str,
-    reg_addr: tuple[str, int],
-):
+async def say_hello(other_actor):
     await trio.sleep(1)  # wait for other actor to spawn
-    async with tractor.find_actor(
-        other_actor,
-        registry_addrs=[reg_addr],
-    ) as portal:
+    async with tractor.find_actor(other_actor) as portal:
         assert portal is not None
         return await portal.run(__name__, 'hi')
 
 
-async def say_hello_use_wait(
-    other_actor: str,
-    reg_addr: tuple[str, int],
-):
-    async with tractor.wait_for_actor(
-        other_actor,
-        registry_addr=reg_addr,
-    ) as portal:
+async def say_hello_use_wait(other_actor):
+    async with tractor.wait_for_actor(other_actor) as portal:
         assert portal is not None
         result = await portal.run(__name__, 'hi')
         return result
@@ -80,29 +69,21 @@ async def say_hello_use_wait(
 
 @tractor_test
 @pytest.mark.parametrize('func', [say_hello, say_hello_use_wait])
-async def test_trynamic_trio(
-    func,
-    start_method,
-    reg_addr,
-):
-    '''
-    Root actor acting as the "director" and running one-shot-task-actors
-    for the directed subs.
-
-    '''
+async def test_trynamic_trio(func, start_method, arb_addr):
+    """Main tractor entry point, the "master" process (for now
+    acts as the "director").
+    """
     async with tractor.open_nursery() as n:
         print("Alright... Action!")
 
         donny = await n.run_in_actor(
             func,
             other_actor='gretchen',
-            reg_addr=reg_addr,
             name='donny',
         )
         gretchen = await n.run_in_actor(
             func,
             other_actor='donny',
-            reg_addr=reg_addr,
             name='gretchen',
         )
         print(await gretchen.result())
@@ -150,7 +131,7 @@ async def unpack_reg(actor_or_portal):
 
 
 async def spawn_and_check_registry(
-    reg_addr: tuple,
+    arb_addr: tuple,
     use_signal: bool,
     remote_arbiter: bool = False,
     with_streaming: bool = False,
@@ -158,9 +139,9 @@ async def spawn_and_check_registry(
 ) -> None:
 
     async with tractor.open_root_actor(
-        registry_addrs=[reg_addr],
+        arbiter_addr=arb_addr,
     ):
-        async with tractor.get_registry(*reg_addr) as portal:
+        async with tractor.get_arbiter(*arb_addr) as portal:
             # runtime needs to be up to call this
             actor = tractor.current_actor()
 
@@ -232,19 +213,17 @@ async def spawn_and_check_registry(
 def test_subactors_unregister_on_cancel(
     start_method,
     use_signal,
-    reg_addr,
+    arb_addr,
     with_streaming,
 ):
-    '''
-    Verify that cancelling a nursery results in all subactors
+    """Verify that cancelling a nursery results in all subactors
     deregistering themselves with the arbiter.
-
-    '''
+    """
     with pytest.raises(KeyboardInterrupt):
         trio.run(
             partial(
                 spawn_and_check_registry,
-                reg_addr,
+                arb_addr,
                 use_signal,
                 remote_arbiter=False,
                 with_streaming=with_streaming,
@@ -258,7 +237,7 @@ def test_subactors_unregister_on_cancel_remote_daemon(
     daemon,
     start_method,
     use_signal,
-    reg_addr,
+    arb_addr,
     with_streaming,
 ):
     """Verify that cancelling a nursery results in all subactors
@@ -269,7 +248,7 @@ def test_subactors_unregister_on_cancel_remote_daemon(
         trio.run(
             partial(
                 spawn_and_check_registry,
-                reg_addr,
+                arb_addr,
                 use_signal,
                 remote_arbiter=True,
                 with_streaming=with_streaming,
@@ -283,7 +262,7 @@ async def streamer(agen):
 
 
 async def close_chans_before_nursery(
-    reg_addr: tuple,
+    arb_addr: tuple,
     use_signal: bool,
     remote_arbiter: bool = False,
 ) -> None:
@@ -296,9 +275,9 @@ async def close_chans_before_nursery(
         entries_at_end = 1
 
     async with tractor.open_root_actor(
-        registry_addrs=[reg_addr],
+        arbiter_addr=arb_addr,
     ):
-        async with tractor.get_registry(*reg_addr) as aportal:
+        async with tractor.get_arbiter(*arb_addr) as aportal:
             try:
                 get_reg = partial(unpack_reg, aportal)
 
@@ -350,7 +329,7 @@ async def close_chans_before_nursery(
 def test_close_channel_explicit(
     start_method,
     use_signal,
-    reg_addr,
+    arb_addr,
 ):
     """Verify that closing a stream explicitly and killing the actor's
     "root nursery" **before** the containing nursery tears down also
@@ -360,7 +339,7 @@ def test_close_channel_explicit(
         trio.run(
             partial(
                 close_chans_before_nursery,
-                reg_addr,
+                arb_addr,
                 use_signal,
                 remote_arbiter=False,
             ),
@@ -372,7 +351,7 @@ def test_close_channel_explicit_remote_arbiter(
     daemon,
     start_method,
     use_signal,
-    reg_addr,
+    arb_addr,
 ):
     """Verify that closing a stream explicitly and killing the actor's
     "root nursery" **before** the containing nursery tears down also
@@ -382,7 +361,7 @@ def test_close_channel_explicit_remote_arbiter(
         trio.run(
             partial(
                 close_chans_before_nursery,
-                reg_addr,
+                arb_addr,
                 use_signal,
                 remote_arbiter=True,
             ),

tests/test_docs_examples.py

@@ -11,7 +11,8 @@ import platform
 import shutil
 
 import pytest
-from tractor._testing import (
+
+from conftest import (
     examples_dir,
 )
 
@@ -19,8 +20,8 @@ from tractor._testing import (
 @pytest.fixture
 def run_example_in_subproc(
     loglevel: str,
-    testdir: pytest.Testdir,
-    reg_addr: tuple[str, int],
+    testdir,
+    arb_addr: tuple[str, int],
 ):
 
     @contextmanager

tests/test_infected_asyncio.py

@@ -2,33 +2,21 @@
 The hipster way to force SC onto the stdlib's "async": 'infection mode'.
 
 '''
+from typing import Optional, Iterable, Union
 import asyncio
 import builtins
-from contextlib import ExitStack
 import itertools
 import importlib
-import os
-from pathlib import Path
-import signal
-from typing import (
-    Callable,
-    Iterable,
-    Union,
-)
 
+from exceptiongroup import BaseExceptionGroup
 import pytest
 import trio
 import tractor
 from tractor import (
-    current_actor,
-    Actor,
     to_asyncio,
     RemoteActorError,
-    ContextCancelled,
-    _state,
 )
 from tractor.trionics import BroadcastReceiver
-from tractor._testing import expect_ctxc
 
 
 async def sleep_and_err(
@@ -36,8 +24,8 @@ async def sleep_and_err(
 
     # just signature placeholders for compat with
     # ``to_asyncio.open_channel_from()``
-    to_trio: trio.MemorySendChannel|None = None,
-    from_trio: asyncio.Queue|None = None,
+    to_trio: Optional[trio.MemorySendChannel] = None,
+    from_trio: Optional[asyncio.Queue] = None,
 
 ):
     if to_trio:
@@ -47,7 +35,7 @@ async def sleep_and_err(
     assert 0
 
 
-async def aio_sleep_forever():
+async def sleep_forever():
     await asyncio.sleep(float('inf'))
 
 
@@ -55,10 +43,10 @@ async def trio_cancels_single_aio_task():
 
     # spawn an ``asyncio`` task to run a func and return result
     with trio.move_on_after(.2):
-        await tractor.to_asyncio.run_task(aio_sleep_forever)
+        await tractor.to_asyncio.run_task(sleep_forever)
 
 
-def test_trio_cancels_aio_on_actor_side(reg_addr):
+def test_trio_cancels_aio_on_actor_side(arb_addr):
     '''
     Spawn an infected actor that is cancelled by the ``trio`` side
     task using std cancel scope apis.
@@ -66,7 +54,7 @@ def test_trio_cancels_aio_on_actor_side(reg_addr):
     '''
     async def main():
         async with tractor.open_nursery(
-            registry_addrs=[reg_addr]
+            arbiter_addr=arb_addr
         ) as n:
             await n.run_in_actor(
                 trio_cancels_single_aio_task,
@@ -77,22 +65,14 @@ def test_trio_cancels_aio_on_actor_side(reg_addr):
 
 
 async def asyncio_actor(
+
     target: str,
-    expect_err: Exception|None = None
+    expect_err: Optional[Exception] = None
 
 ) -> None:
 
-    # ensure internal runtime state is consistent
-    actor: Actor = tractor.current_actor()
-    assert (
-        actor.is_infected_aio()
-        and
-        actor._infected_aio
-        and
-        _state._runtime_vars['_is_infected_aio']
-    )
-
-    target: Callable = globals()[target]
+    assert tractor.current_actor().is_infected_aio()
+    target = globals()[target]
 
     if '.' in expect_err:
         modpath, _, name = expect_err.rpartition('.')
@@ -113,7 +93,7 @@ async def asyncio_actor(
         raise
 
 
-def test_aio_simple_error(reg_addr):
+def test_aio_simple_error(arb_addr):
     '''
     Verify a simple remote asyncio error propagates back through trio
     to the parent actor.
@@ -122,7 +102,7 @@ def test_aio_simple_error(reg_addr):
     '''
     async def main():
         async with tractor.open_nursery(
-            registry_addrs=[reg_addr]
+            arbiter_addr=arb_addr
         ) as n:
             await n.run_in_actor(
                 asyncio_actor,
@@ -131,26 +111,15 @@ def test_aio_simple_error(reg_addr):
                 infect_asyncio=True,
             )
 
-    with pytest.raises(
-        expected_exception=(RemoteActorError, ExceptionGroup),
-    ) as excinfo:
+    with pytest.raises(RemoteActorError) as excinfo:
         trio.run(main)
 
     err = excinfo.value
-
-    # might get multiple `trio.Cancelled`s as well inside an inception
-    if isinstance(err, ExceptionGroup):
-        err = next(itertools.dropwhile(
-            lambda exc: not isinstance(exc, tractor.RemoteActorError),
-            err.exceptions
-        ))
-        assert err
-
     assert isinstance(err, RemoteActorError)
-    assert err.boxed_type is AssertionError
+    assert err.type == AssertionError
 
 
-def test_tractor_cancels_aio(reg_addr):
+def test_tractor_cancels_aio(arb_addr):
     '''
     Verify we can cancel a spawned asyncio task gracefully.
 
@@ -159,7 +128,7 @@ def test_tractor_cancels_aio(reg_addr):
         async with tractor.open_nursery() as n:
             portal = await n.run_in_actor(
                 asyncio_actor,
-                target='aio_sleep_forever',
+                target='sleep_forever',
                 expect_err='trio.Cancelled',
                 infect_asyncio=True,
             )
@@ -169,7 +138,7 @@ def test_tractor_cancels_aio(reg_addr):
     trio.run(main)
 
 
-def test_trio_cancels_aio(reg_addr):
+def test_trio_cancels_aio(arb_addr):
     '''
     Much like the above test with ``tractor.Portal.cancel_actor()``
     except we just use a standard ``trio`` cancellation api.
@@ -183,7 +152,7 @@ def test_trio_cancels_aio(reg_addr):
             async with tractor.open_nursery() as n:
                 await n.run_in_actor(
                     asyncio_actor,
-                    target='aio_sleep_forever',
+                    target='sleep_forever',
                     expect_err='trio.Cancelled',
                     infect_asyncio=True,
                 )
@@ -214,18 +183,17 @@ async def trio_ctx(
             # spawn another asyncio task for the cuck of it.
             n.start_soon(
                 tractor.to_asyncio.run_task,
-                aio_sleep_forever,
+                sleep_forever,
             )
             await trio.sleep_forever()
 
 
 @pytest.mark.parametrize(
-    'parent_cancels',
-    ['context', 'actor', False],
+    'parent_cancels', [False, True],
     ids='parent_actor_cancels_child={}'.format
 )
 def test_context_spawns_aio_task_that_errors(
-    reg_addr,
+    arb_addr,
     parent_cancels: bool,
 ):
     '''
@@ -245,53 +213,26 @@ def test_context_spawns_aio_task_that_errors(
                     # debug_mode=True,
                     loglevel='cancel',
                 )
-                async with (
-                    expect_ctxc(
-                        yay=parent_cancels == 'actor',
-                    ),
-                    p.open_context(
-                        trio_ctx,
-                    ) as (ctx, first),
-                ):
+                async with p.open_context(
+                    trio_ctx,
+                ) as (ctx, first):
 
                     assert first == 'start'
 
-                    if parent_cancels == 'actor':
+                    if parent_cancels:
                         await p.cancel_actor()
 
-                    elif parent_cancels == 'context':
-                        await ctx.cancel()
+                    await trio.sleep_forever()
 
-                    else:
-                        await trio.sleep_forever()
-
-                async with expect_ctxc(
-                    yay=parent_cancels == 'actor',
-                ):
-                    await ctx.result()
-
-                if parent_cancels == 'context':
-                    # to tear down sub-acor
-                    await p.cancel_actor()
-
-        return ctx.outcome
+    with pytest.raises(RemoteActorError) as excinfo:
+        trio.run(main)
 
+    err = excinfo.value
+    assert isinstance(err, RemoteActorError)
     if parent_cancels:
-        # bc the parent made the cancel request,
-        # the error is not raised locally but instead
-        # the context is exited silently
-        res = trio.run(main)
-        assert isinstance(res, ContextCancelled)
-        assert 'root' in res.canceller[0]
-
+        assert err.type == trio.Cancelled
     else:
-        expect = RemoteActorError
-        with pytest.raises(expect) as excinfo:
-            trio.run(main)
-
-        err = excinfo.value
-        assert isinstance(err, expect)
-        assert err.boxed_type is AssertionError
+        assert err.type == AssertionError
 
 
 async def aio_cancel():
@@ -300,53 +241,29 @@ async def aio_cancel():
 
     '''
     await asyncio.sleep(0.5)
+    task = asyncio.current_task()
 
     # cancel and enter sleep
-    task = asyncio.current_task()
     task.cancel()
-    await aio_sleep_forever()
+    await sleep_forever()
 
 
-def test_aio_cancelled_from_aio_causes_trio_cancelled(reg_addr):
-    '''
-    When the `asyncio.Task` cancels itself the `trio` side cshould
-    also cancel and teardown and relay the cancellation cross-process
-    to the caller (parent).
+def test_aio_cancelled_from_aio_causes_trio_cancelled(arb_addr):
 
-    '''
     async def main():
-
-        an: tractor.ActorNursery
-        async with tractor.open_nursery() as an:
-            p: tractor.Portal = await an.run_in_actor(
+        async with tractor.open_nursery() as n:
+            await n.run_in_actor(
                 asyncio_actor,
                 target='aio_cancel',
                 expect_err='tractor.to_asyncio.AsyncioCancelled',
                 infect_asyncio=True,
             )
-            # NOTE: normally the `an.__aexit__()` waits on the
-            # portal's result but we do it explicitly here
-            # to avoid indent levels.
-            with trio.fail_after(1):
-                await p.wait_for_result()
 
-    with pytest.raises(
-        expected_exception=(RemoteActorError, ExceptionGroup),
-    ) as excinfo:
+    with pytest.raises(RemoteActorError) as excinfo:
         trio.run(main)
 
-    # might get multiple `trio.Cancelled`s as well inside an inception
-    err: RemoteActorError|ExceptionGroup = excinfo.value
-    if isinstance(err, ExceptionGroup):
-        err = next(itertools.dropwhile(
-            lambda exc: not isinstance(exc, tractor.RemoteActorError),
-            err.exceptions
-        ))
-        assert err
-
-    # relayed boxed error should be our `trio`-task's
-    # cancel-signal-proxy-equivalent of `asyncio.CancelledError`.
-    assert err.boxed_type == to_asyncio.AsyncioCancelled
+    # ensure boxed error is correct
+    assert excinfo.value.type == to_asyncio.AsyncioCancelled
 
 
 # TODO: verify open_channel_from will fail on this..
@@ -387,6 +304,7 @@ async def push_from_aio_task(
 
 
 async def stream_from_aio(
+
     exit_early: bool = False,
     raise_err: bool = False,
     aio_raise_err: bool = False,
@@ -467,7 +385,7 @@ async def stream_from_aio(
     'fan_out', [False, True],
     ids='fan_out_w_chan_subscribe={}'.format
 )
-def test_basic_interloop_channel_stream(reg_addr, fan_out):
+def test_basic_interloop_channel_stream(arb_addr, fan_out):
     async def main():
         async with tractor.open_nursery() as n:
             portal = await n.run_in_actor(
@@ -475,14 +393,13 @@ def test_basic_interloop_channel_stream(reg_addr, fan_out):
                 infect_asyncio=True,
                 fan_out=fan_out,
             )
-            # should raise RAE diectly
             await portal.result()
 
     trio.run(main)
 
 
 # TODO: parametrize the above test and avoid the duplication here?
-def test_trio_error_cancels_intertask_chan(reg_addr):
+def test_trio_error_cancels_intertask_chan(arb_addr):
     async def main():
         async with tractor.open_nursery() as n:
             portal = await n.run_in_actor(
@@ -493,14 +410,15 @@ def test_trio_error_cancels_intertask_chan(reg_addr):
             # should trigger remote actor error
             await portal.result()
 
-    with pytest.raises(RemoteActorError) as excinfo:
+    with pytest.raises(BaseExceptionGroup) as excinfo:
         trio.run(main)
 
-    # ensure boxed error type
-    excinfo.value.boxed_type is Exception
+    # ensure boxed errors
+    for exc in excinfo.value.exceptions:
+        assert exc.type == Exception
 
 
-def test_trio_closes_early_and_channel_exits(reg_addr):
+def test_trio_closes_early_and_channel_exits(arb_addr):
     async def main():
         async with tractor.open_nursery() as n:
             portal = await n.run_in_actor(
@@ -508,14 +426,14 @@ def test_trio_closes_early_and_channel_exits(reg_addr):
                 exit_early=True,
                 infect_asyncio=True,
             )
-            # should raise RAE diectly
+            # should trigger remote actor error
             await portal.result()
 
     # should be a quiet exit on a simple channel exit
     trio.run(main)
 
 
-def test_aio_errors_and_channel_propagates_and_closes(reg_addr):
+def test_aio_errors_and_channel_propagates_and_closes(arb_addr):
     async def main():
         async with tractor.open_nursery() as n:
             portal = await n.run_in_actor(
@@ -523,17 +441,15 @@ def test_aio_errors_and_channel_propagates_and_closes(reg_addr):
                 aio_raise_err=True,
                 infect_asyncio=True,
             )
-            # should trigger RAE directly, not an eg.
+            # should trigger remote actor error
             await portal.result()
 
-    with pytest.raises(
-        # NOTE: bc we directly wait on `Portal.result()` instead
-        # of capturing it inside the `ActorNursery` machinery.
-        expected_exception=RemoteActorError,
-    ) as excinfo:
+    with pytest.raises(BaseExceptionGroup) as excinfo:
         trio.run(main)
 
-    excinfo.value.boxed_type is Exception
+    # ensure boxed errors
+    for exc in excinfo.value.exceptions:
+        assert exc.type == Exception
 
 
 @tractor.context
@@ -594,7 +510,7 @@ async def trio_to_aio_echo_server(
     ids='raise_error={}'.format,
 )
 def test_echoserver_detailed_mechanics(
-    reg_addr,
+    arb_addr,
     raise_error_mid_stream,
 ):
 
@@ -634,8 +550,7 @@ def test_echoserver_detailed_mechanics(
                             pass
                         else:
                             pytest.fail(
-                                'stream not stopped after sentinel ?!'
-                            )
+                                "stream wasn't stopped after sentinel?!")
 
             # TODO: the case where this blocks and
             # is cancelled by kbi or out of task cancellation
@@ -647,273 +562,3 @@ def test_echoserver_detailed_mechanics(
 
     else:
         trio.run(main)
-
-
-
-@tractor.context
-async def manage_file(
-    ctx: tractor.Context,
-    tmp_path_str: str,
-    send_sigint_to: str,
-    trio_side_is_shielded: bool = True,
-    bg_aio_task: bool = False,
-):
-    '''
-    Start an `asyncio` task that just sleeps after registering a context
-    with `Actor.lifetime_stack`. Trigger a SIGINT to kill the actor tree
-    and ensure the stack is closed in the infected mode child.
-
-    To verify the teardown state just write a tmpfile to the `testdir`
-    and delete it on actor close.
-
-    '''
-
-    tmp_path: Path = Path(tmp_path_str)
-    tmp_file: Path = tmp_path / f'{" ".join(ctx._actor.uid)}.file'
-
-    # create a the tmp file and tell the parent where it's at
-    assert not tmp_file.is_file()
-    tmp_file.touch()
-
-    stack: ExitStack = current_actor().lifetime_stack
-    stack.callback(tmp_file.unlink)
-
-    await ctx.started((
-        str(tmp_file),
-        os.getpid(),
-    ))
-
-    # expect to be cancelled from here!
-    try:
-
-        # NOTE: turns out you don't even need to sched an aio task
-        # since the original issue, even though seemingly was due to
-        # the guest-run being abandoned + a `._debug.pause()` inside
-        # `._runtime._async_main()` (which was originally trying to
-        # debug the `.lifetime_stack` not closing), IS NOT actually
-        # the core issue?
-        #
-        # further notes:
-        #
-        # - `trio` only issues the " RuntimeWarning: Trio guest run
-        #   got abandoned without properly finishing... weird stuff
-        #   might happen" IFF you DO run a asyncio task here, BUT
-        # - the original issue of the `.lifetime_stack` not closing
-        #   will still happen even if you don't run an `asyncio` task
-        #   here even though the "abandon" messgage won't be shown..
-        #
-        # => ????? honestly i'm lost but it seems to be some issue
-        #   with `asyncio` and SIGINT..
-        #
-        # honestly, this REALLY reminds me why i haven't used
-        # `asyncio` by choice in years.. XD
-        #
-        async with trio.open_nursery() as tn:
-            if bg_aio_task:
-                tn.start_soon(
-                    tractor.to_asyncio.run_task,
-                    aio_sleep_forever,
-                )
-
-            # XXX don't-need/doesn't-make-a-diff right
-            # since we're already doing it from parent?
-            # if send_sigint_to == 'child':
-            #     os.kill(
-            #         os.getpid(),
-            #         signal.SIGINT,
-            #     )
-
-            # XXX spend a half sec doing shielded checkpointing to
-            # ensure that despite the `trio`-side task ignoring the
-            # SIGINT, the `asyncio` side won't abandon the guest-run!
-            if trio_side_is_shielded:
-                with trio.CancelScope(shield=True):
-                    for i in range(5):
-                        await trio.sleep(0.1)
-
-            await trio.sleep_forever()
-
-    # signalled manually at the OS level (aka KBI) by the parent actor.
-    except KeyboardInterrupt:
-        print('child raised KBI..')
-        assert tmp_file.exists()
-        raise
-
-    raise RuntimeError('shoulda received a KBI?')
-
-
-@pytest.mark.parametrize(
-    'trio_side_is_shielded',
-    [
-        False,
-        True,
-    ],
-    ids=[
-        'trio_side_no_shielding',
-        'trio_side_does_shielded_work',
-    ],
-)
-@pytest.mark.parametrize(
-    'send_sigint_to',
-    [
-        'child',
-        'parent',
-    ],
-    ids='send_SIGINT_to={}'.format,
-)
-@pytest.mark.parametrize(
-    'bg_aio_task',
-    [
-        False,
-
-        # NOTE: (and see notes in `manage_file()` above as well) if
-        # we FOR SURE SPAWN AN AIO TASK in the child it seems the
-        # "silent-abandon" case (as is described in detail in
-        # `to_asyncio.run_as_asyncio_guest()`) does not happen and
-        # `asyncio`'s loop will at least abandon the `trio` side
-        # loudly? .. prolly the state-spot to start looking for
-        # a soln that results in NO ABANDONMENT.. XD
-        True,
-    ],
-    ids=[
-        'bg_aio_task',
-        'just_trio_slee',
-    ],
-)
-@pytest.mark.parametrize(
-    'wait_for_ctx',
-    [
-        False,
-        True,
-    ],
-    ids=[
-        'raise_KBI_in_rent',
-        'wait_for_ctx',
-    ],
-)
-def test_sigint_closes_lifetime_stack(
-    tmp_path: Path,
-    wait_for_ctx: bool,
-    bg_aio_task: bool,
-    trio_side_is_shielded: bool,
-    debug_mode: bool,
-    send_sigint_to: str,
-):
-    '''
-    Ensure that an infected child can use the `Actor.lifetime_stack`
-    to make a file on boot and it's automatically cleaned up by the
-    actor-lifetime-linked exit stack closure.
-
-    '''
-    async def main():
-        try:
-            an: tractor.ActorNursery
-            async with tractor.open_nursery(
-                debug_mode=debug_mode,
-            ) as an:
-                p: tractor.Portal = await an.start_actor(
-                    'file_mngr',
-                    enable_modules=[__name__],
-                    infect_asyncio=True,
-                )
-                async with p.open_context(
-                    manage_file,
-                    tmp_path_str=str(tmp_path),
-                    send_sigint_to=send_sigint_to,
-                    bg_aio_task=bg_aio_task,
-                    trio_side_is_shielded=trio_side_is_shielded,
-                ) as (ctx, first):
-
-                    path_str, cpid = first
-                    tmp_file: Path = Path(path_str)
-                    assert tmp_file.exists()
-
-                    # XXX originally to simulate what (hopefully)
-                    # the below now triggers.. had to manually
-                    # trigger a SIGINT from a ctl-c in the root.
-                    # await trio.sleep_forever()
-
-                    # XXX NOTE XXX signal infected-`asyncio` child to
-                    # OS-cancel with SIGINT; this should trigger the
-                    # bad `asyncio` cancel behaviour that can cause
-                    # a guest-run abandon as was seen causing
-                    # shm-buffer leaks in `piker`'s live quote stream
-                    # susbys!
-                    #
-                    await trio.sleep(.2)
-                    pid: int = (
-                        cpid if send_sigint_to == 'child'
-                        else os.getpid()
-                    )
-                    os.kill(
-                        pid,
-                        signal.SIGINT,
-                    )
-
-                    # XXX CASE 1: without the bug fixed, in
-                    # the non-KBI-raised-in-parent case, this
-                    # timeout should trigger!
-                    if wait_for_ctx:
-                        print('waiting for ctx outcome in parent..')
-                        try:
-                            with trio.fail_after(1):
-                                await ctx.wait_for_result()
-                        except tractor.ContextCancelled as ctxc:
-                            assert ctxc.canceller == ctx.chan.uid
-                            raise
-
-                    # XXX CASE 2: this seems to be the source of the
-                    # original issue which exhibited BEFORE we put
-                    # a `Actor.cancel_soon()` inside
-                    # `run_as_asyncio_guest()`..
-                    else:
-                        raise KeyboardInterrupt
-
-                pytest.fail('should have raised some kinda error?!?')
-
-        except (
-            KeyboardInterrupt,
-            ContextCancelled,
-        ):
-            # XXX CASE 2: without the bug fixed, in the
-            # KBI-raised-in-parent case, the actor teardown should
-            # never get run (silently abaondoned by `asyncio`..) and
-            # thus the file should leak!
-            assert not tmp_file.exists()
-            assert ctx.maybe_error
-
-    trio.run(main)
-
-
-# TODO: debug_mode tests once we get support for `asyncio`!
-#
-# -[ ] need tests to wrap both scripts:
-#   - [ ] infected_asyncio_echo_server.py
-#   - [ ] debugging/asyncio_bp.py
-#  -[ ] consider moving ^ (some of) these ^ to `test_debugger`?
-#
-# -[ ] missing impl outstanding includes:
-#  - [x] for sync pauses we need to ensure we open yet another
-#    `greenback` portal in the asyncio task
-#    => completed using `.bestow_portal(task)` inside
-#     `.to_asyncio._run_asyncio_task()` right?
-#   -[ ] translation func to get from `asyncio` task calling to 
-#     `._debug.wait_for_parent_stdin_hijack()` which does root
-#     call to do TTY locking.
-#
-def test_sync_breakpoint():
-    '''
-    Verify we can do sync-func/code breakpointing using the
-    `breakpoint()` builtin inside infected mode actors.
-
-    '''
-    pytest.xfail('This support is not implemented yet!')
-
-
-def test_debug_mode_crash_handling():
-    '''
-    Verify mult-actor crash handling works with a combo of infected-`asyncio`-mode
-    and normal `trio` actors despite nested process trees.
-
-    '''
-    pytest.xfail('This support is not implemented yet!')

tests/test_legacy_one_way_streaming.py

@@ -9,7 +9,7 @@ import trio
 import tractor
 import pytest
 
-from tractor._testing import tractor_test
+from conftest import tractor_test
 
 
 def test_must_define_ctx():
@@ -38,13 +38,10 @@ async def async_gen_stream(sequence):
     assert cs.cancelled_caught
 
 
-# TODO: deprecated either remove entirely
-# or re-impl in terms of `MsgStream` one-sides
-# wrapper, but at least remove `Portal.open_stream_from()`
 @tractor.stream
 async def context_stream(
     ctx: tractor.Context,
-    sequence: list[int],
+    sequence
 ):
     for i in sequence:
         await ctx.send_yield(i)
@@ -58,7 +55,7 @@ async def context_stream(
 
 
 async def stream_from_single_subactor(
-    reg_addr,
+    arb_addr,
     start_method,
     stream_func,
 ):
@@ -67,7 +64,7 @@ async def stream_from_single_subactor(
     # only one per host address, spawns an actor if None
 
     async with tractor.open_nursery(
-        registry_addrs=[reg_addr],
+        arbiter_addr=arb_addr,
         start_method=start_method,
     ) as nursery:
 
@@ -118,13 +115,13 @@ async def stream_from_single_subactor(
 @pytest.mark.parametrize(
     'stream_func', [async_gen_stream, context_stream]
 )
-def test_stream_from_single_subactor(reg_addr, start_method, stream_func):
+def test_stream_from_single_subactor(arb_addr, start_method, stream_func):
     """Verify streaming from a spawned async generator.
     """
     trio.run(
         partial(
             stream_from_single_subactor,
-            reg_addr,
+            arb_addr,
             start_method,
             stream_func=stream_func,
         ),
@@ -228,14 +225,14 @@ async def a_quadruple_example():
         return result_stream
 
 
-async def cancel_after(wait, reg_addr):
-    async with tractor.open_root_actor(registry_addrs=[reg_addr]):
+async def cancel_after(wait, arb_addr):
+    async with tractor.open_root_actor(arbiter_addr=arb_addr):
         with trio.move_on_after(wait):
             return await a_quadruple_example()
 
 
 @pytest.fixture(scope='module')
-def time_quad_ex(reg_addr, ci_env, spawn_backend):
+def time_quad_ex(arb_addr, ci_env, spawn_backend):
     if spawn_backend == 'mp':
         """no idea but the  mp *nix runs are flaking out here often...
         """
@@ -243,7 +240,7 @@ def time_quad_ex(reg_addr, ci_env, spawn_backend):
 
     timeout = 7 if platform.system() in ('Windows', 'Darwin') else 4
     start = time.time()
-    results = trio.run(cancel_after, timeout, reg_addr)
+    results = trio.run(cancel_after, timeout, arb_addr)
     diff = time.time() - start
     assert results
     return results, diff
@@ -263,14 +260,14 @@ def test_a_quadruple_example(time_quad_ex, ci_env, spawn_backend):
     list(map(lambda i: i/10, range(3, 9)))
 )
 def test_not_fast_enough_quad(
-    reg_addr, time_quad_ex, cancel_delay, ci_env, spawn_backend
+    arb_addr, time_quad_ex, cancel_delay, ci_env, spawn_backend
 ):
     """Verify we can cancel midway through the quad example and all actors
     cancel gracefully.
     """
     results, diff = time_quad_ex
     delay = max(diff - cancel_delay, 0)
-    results = trio.run(cancel_after, delay, reg_addr)
+    results = trio.run(cancel_after, delay, arb_addr)
     system = platform.system()
     if system in ('Windows', 'Darwin') and results is not None:
         # In CI envoirments it seems later runs are quicker then the first
@@ -283,7 +280,7 @@ def test_not_fast_enough_quad(
 
 @tractor_test
 async def test_respawn_consumer_task(
-    reg_addr,
+    arb_addr,
     spawn_backend,
     loglevel,
 ):

tests/test_local.py

@@ -7,7 +7,7 @@ import pytest
 import trio
 import tractor
 
-from tractor._testing import tractor_test
+from conftest import tractor_test
 
 
 @pytest.mark.trio
@@ -24,7 +24,7 @@ async def test_no_runtime():
 
 
 @tractor_test
-async def test_self_is_registered(reg_addr):
+async def test_self_is_registered(arb_addr):
     "Verify waiting on the arbiter to register itself using the standard api."
     actor = tractor.current_actor()
     assert actor.is_arbiter
@@ -34,20 +34,20 @@ async def test_self_is_registered(reg_addr):
 
 
 @tractor_test
-async def test_self_is_registered_localportal(reg_addr):
+async def test_self_is_registered_localportal(arb_addr):
     "Verify waiting on the arbiter to register itself using a local portal."
     actor = tractor.current_actor()
     assert actor.is_arbiter
-    async with tractor.get_registry(*reg_addr) as portal:
+    async with tractor.get_arbiter(*arb_addr) as portal:
         assert isinstance(portal, tractor._portal.LocalPortal)
 
         with trio.fail_after(0.2):
             sockaddr = await portal.run_from_ns(
                     'self', 'wait_for_actor', name='root')
-            assert sockaddr[0] == reg_addr
+            assert sockaddr[0] == arb_addr
 
 
-def test_local_actor_async_func(reg_addr):
+def test_local_actor_async_func(arb_addr):
     """Verify a simple async function in-process.
     """
     nums = []
@@ -55,7 +55,7 @@ def test_local_actor_async_func(reg_addr):
     async def print_loop():
 
         async with tractor.open_root_actor(
-            registry_addrs=[reg_addr],
+            arbiter_addr=arb_addr,
         ):
             # arbiter is started in-proc if dne
             assert tractor.current_actor().is_arbiter

tests/test_multi_program.py

@@ -7,10 +7,8 @@ import time
 import pytest
 import trio
 import tractor
-from tractor._testing import (
-    tractor_test,
-)
 from conftest import (
+    tractor_test,
     sig_prog,
     _INT_SIGNAL,
     _INT_RETURN_CODE,
@@ -30,9 +28,9 @@ def test_abort_on_sigint(daemon):
 
 
 @tractor_test
-async def test_cancel_remote_arbiter(daemon, reg_addr):
+async def test_cancel_remote_arbiter(daemon, arb_addr):
     assert not tractor.current_actor().is_arbiter
-    async with tractor.get_registry(*reg_addr) as portal:
+    async with tractor.get_arbiter(*arb_addr) as portal:
         await portal.cancel_actor()
 
     time.sleep(0.1)
@@ -41,16 +39,16 @@ async def test_cancel_remote_arbiter(daemon, reg_addr):
 
     # no arbiter socket should exist
     with pytest.raises(OSError):
-        async with tractor.get_registry(*reg_addr) as portal:
+        async with tractor.get_arbiter(*arb_addr) as portal:
             pass
 
 
-def test_register_duplicate_name(daemon, reg_addr):
+def test_register_duplicate_name(daemon, arb_addr):
 
     async def main():
 
         async with tractor.open_nursery(
-            registry_addrs=[reg_addr],
+            arbiter_addr=arb_addr,
         ) as n:
 
             assert not tractor.current_actor().is_arbiter

tests/test_pldrx_limiting.py

@@ -1,364 +0,0 @@
-'''
-Audit sub-sys APIs from `.msg._ops`
-mostly for ensuring correct `contextvars`
-related settings around IPC contexts.
-
-'''
-from contextlib import (
-    asynccontextmanager as acm,
-)
-
-from msgspec import (
-    Struct,
-)
-import pytest
-import trio
-
-import tractor
-from tractor import (
-    Context,
-    MsgTypeError,
-    current_ipc_ctx,
-    Portal,
-)
-from tractor.msg import (
-    _ops as msgops,
-    Return,
-)
-from tractor.msg import (
-    _codec,
-)
-from tractor.msg.types import (
-    log,
-)
-
-
-class PldMsg(
-    Struct,
-
-    # TODO: with multiple structs in-spec we need to tag them!
-    # -[ ] offer a built-in `PldMsg` type to inherit from which takes
-    #      case of these details?
-    #
-    # https://jcristharif.com/msgspec/structs.html#tagged-unions
-    # tag=True,
-    # tag_field='msg_type',
-):
-    field: str
-
-
-maybe_msg_spec = PldMsg|None
-
-
-@acm
-async def maybe_expect_raises(
-    raises: BaseException|None = None,
-    ensure_in_message: list[str]|None = None,
-    post_mortem: bool = False,
-    timeout: int = 3,
-) -> None:
-    '''
-    Async wrapper for ensuring errors propagate from the inner scope.
-
-    '''
-    if tractor._state.debug_mode():
-        timeout += 999
-
-    with trio.fail_after(timeout):
-        try:
-            yield
-        except BaseException as _inner_err:
-            inner_err = _inner_err
-            # wasn't-expected to error..
-            if raises is None:
-                raise
-
-            else:
-                assert type(inner_err) is raises
-
-                # maybe check for error txt content
-                if ensure_in_message:
-                    part: str
-                    err_repr: str = repr(inner_err)
-                    for part in ensure_in_message:
-                        for i, arg in enumerate(inner_err.args):
-                            if part in err_repr:
-                                break
-                        # if part never matches an arg, then we're
-                        # missing a match.
-                        else:
-                            raise ValueError(
-                                'Failed to find error message content?\n\n'
-                                f'expected: {ensure_in_message!r}\n'
-                                f'part: {part!r}\n\n'
-                                f'{inner_err.args}'
-                        )
-
-                if post_mortem:
-                    await tractor.post_mortem()
-
-        else:
-            if raises:
-                raise RuntimeError(
-                    f'Expected a {raises.__name__!r} to be raised?'
-                )
-
-
-@tractor.context(
-    pld_spec=maybe_msg_spec,
-)
-async def child(
-    ctx: Context,
-    started_value: int|PldMsg|None,
-    return_value: str|None,
-    validate_pld_spec: bool,
-    raise_on_started_mte: bool = True,
-
-) -> None:
-    '''
-    Call ``Context.started()`` more then once (an error).
-
-    '''
-    expect_started_mte: bool = started_value == 10
-
-    # sanaity check that child RPC context is the current one
-    curr_ctx: Context = current_ipc_ctx()
-    assert ctx is curr_ctx
-
-    rx: msgops.PldRx = ctx._pld_rx
-    curr_pldec: _codec.MsgDec = rx.pld_dec
-
-    ctx_meta: dict = getattr(
-        child,
-        '_tractor_context_meta',
-        None,
-    )
-    if ctx_meta:
-        assert (
-            ctx_meta['pld_spec']
-            is curr_pldec.spec
-            is curr_pldec.pld_spec
-        )
-
-    # 2 cases: hdndle send-side and recv-only validation
-    # - when `raise_on_started_mte == True`, send validate
-    # - else, parent-recv-side only validation
-    mte: MsgTypeError|None = None
-    try:
-        await ctx.started(
-            value=started_value,
-            validate_pld_spec=validate_pld_spec,
-        )
-
-    except MsgTypeError as _mte:
-        mte = _mte
-        log.exception('started()` raised an MTE!\n')
-        if not expect_started_mte:
-            raise RuntimeError(
-                'Child-ctx-task SHOULD NOT HAVE raised an MTE for\n\n'
-                f'{started_value!r}\n'
-            )
-
-        boxed_div: str = '------ - ------'
-        assert boxed_div not in mte._message
-        assert boxed_div not in mte.tb_str
-        assert boxed_div not in repr(mte)
-        assert boxed_div not in str(mte)
-        mte_repr: str = repr(mte)
-        for line in mte.message.splitlines():
-            assert line in mte_repr
-
-        # since this is a *local error* there should be no
-        # boxed traceback content!
-        assert not mte.tb_str
-
-        # propagate to parent?
-        if raise_on_started_mte:
-            raise
-
-    # no-send-side-error fallthrough
-    if (
-        validate_pld_spec
-        and
-        expect_started_mte
-    ):
-        raise RuntimeError(
-            'Child-ctx-task SHOULD HAVE raised an MTE for\n\n'
-            f'{started_value!r}\n'
-        )
-
-    assert (
-        not expect_started_mte
-        or
-        not validate_pld_spec
-    )
-
-    # if wait_for_parent_to_cancel:
-    #     ...
-    #
-    # ^-TODO-^ logic for diff validation policies on each side:
-    #
-    # -[ ] ensure that if we don't validate on the send
-    #   side, that we are eventually error-cancelled by our
-    #   parent due to the bad `Started` payload!
-    # -[ ] the boxed error should be srced from the parent's
-    #   runtime NOT ours!
-    # -[ ] we should still error on bad `return_value`s
-    #   despite the parent not yet error-cancelling us?
-    #   |_ how do we want the parent side to look in that
-    #     case?
-    #     -[ ] maybe the equiv of "during handling of the
-    #       above error another occurred" for the case where
-    #       the parent sends a MTE to this child and while
-    #       waiting for the child to terminate it gets back
-    #       the MTE for this case?
-    #
-
-    # XXX should always fail on recv side since we can't
-    # really do much else beside terminate and relay the
-    # msg-type-error from this RPC task ;)
-    return return_value
-
-
-@pytest.mark.parametrize(
-    'return_value',
-    [
-        'yo',
-        None,
-    ],
-    ids=[
-        'return[invalid-"yo"]',
-        'return[valid-None]',
-    ],
-)
-@pytest.mark.parametrize(
-    'started_value',
-    [
-        10,
-        PldMsg(field='yo'),
-    ],
-    ids=[
-        'Started[invalid-10]',
-        'Started[valid-PldMsg]',
-    ],
-)
-@pytest.mark.parametrize(
-    'pld_check_started_value',
-    [
-        True,
-        False,
-    ],
-    ids=[
-        'check-started-pld',
-        'no-started-pld-validate',
-    ],
-)
-def test_basic_payload_spec(
-    debug_mode: bool,
-    loglevel: str,
-    return_value: str|None,
-    started_value: int|PldMsg,
-    pld_check_started_value: bool,
-):
-    '''
-    Validate the most basic `PldRx` msg-type-spec semantics around
-    a IPC `Context` endpoint start, started-sync, and final return
-    value depending on set payload types and the currently applied
-    pld-spec.
-
-    '''
-    invalid_return: bool = return_value == 'yo'
-    invalid_started: bool = started_value == 10
-
-    async def main():
-        async with tractor.open_nursery(
-            debug_mode=debug_mode,
-            loglevel=loglevel,
-        ) as an:
-            p: Portal = await an.start_actor(
-                'child',
-                enable_modules=[__name__],
-            )
-
-            # since not opened yet.
-            assert current_ipc_ctx() is None
-
-            if invalid_started:
-                msg_type_str: str = 'Started'
-                bad_value: int = 10
-            elif invalid_return:
-                msg_type_str: str = 'Return'
-                bad_value: str = 'yo'
-            else:
-                # XXX but should never be used below then..
-                msg_type_str: str = ''
-                bad_value: str = ''
-
-            maybe_mte: MsgTypeError|None = None
-            should_raise: Exception|None = (
-                MsgTypeError if (
-                    invalid_return
-                    or
-                    invalid_started
-                ) else None
-            )
-            async with (
-                maybe_expect_raises(
-                    raises=should_raise,
-                    ensure_in_message=[
-                        f"invalid `{msg_type_str}` msg payload",
-                        f'{bad_value}',
-                        f'has type {type(bad_value)!r}',
-                        'not match type-spec',
-                        f'`{msg_type_str}.pld: PldMsg|NoneType`',
-                    ],
-                    # only for debug
-                    # post_mortem=True,
-                ),
-                p.open_context(
-                    child,
-                    return_value=return_value,
-                    started_value=started_value,
-                    validate_pld_spec=pld_check_started_value,
-                ) as (ctx, first),
-            ):
-                # now opened with 'child' sub
-                assert current_ipc_ctx() is ctx
-
-                assert type(first) is PldMsg
-                assert first.field == 'yo'
-
-                try:
-                    res: None|PldMsg = await ctx.result(hide_tb=False)
-                    assert res is None
-                except MsgTypeError as mte:
-                    maybe_mte = mte
-                    if not invalid_return:
-                        raise
-
-                    # expected this invalid `Return.pld` so audit
-                    # the error state + meta-data
-                    assert mte.expected_msg_type is Return
-                    assert mte.cid == ctx.cid
-                    mte_repr: str = repr(mte)
-                    for line in mte.message.splitlines():
-                        assert line in mte_repr
-
-                    assert mte.tb_str
-                    # await tractor.pause(shield=True)
-
-                    # verify expected remote mte deats
-                    assert ctx._local_error is None
-                    assert (
-                        mte is
-                        ctx._remote_error is
-                        ctx.maybe_error is
-                        ctx.outcome
-                    )
-
-            if should_raise is None:
-                assert maybe_mte is None
-
-            await p.cancel_actor()
-
-    trio.run(main)

tests/test_pubsub.py

@@ -5,7 +5,8 @@ import pytest
 import trio
 import tractor
 from tractor.experimental import msgpub
-from tractor._testing import tractor_test
+
+from conftest import tractor_test
 
 
 def test_type_checks():
@@ -159,7 +160,7 @@ async def test_required_args(callwith_expecterror):
 )
 def test_multi_actor_subs_arbiter_pub(
     loglevel,
-    reg_addr,
+    arb_addr,
     pub_actor,
 ):
     """Try out the neato @pub decorator system.
@@ -169,7 +170,7 @@ def test_multi_actor_subs_arbiter_pub(
     async def main():
 
         async with tractor.open_nursery(
-            registry_addrs=[reg_addr],
+            arbiter_addr=arb_addr,
             enable_modules=[__name__],
         ) as n:
 
@@ -254,12 +255,12 @@ def test_multi_actor_subs_arbiter_pub(
 
 def test_single_subactor_pub_multitask_subs(
     loglevel,
-    reg_addr,
+    arb_addr,
 ):
     async def main():
 
         async with tractor.open_nursery(
-            registry_addrs=[reg_addr],
+            arbiter_addr=arb_addr,
             enable_modules=[__name__],
         ) as n:
 

tests/test_resource_cache.py

@@ -34,6 +34,7 @@ def test_resource_only_entered_once(key_on):
     global _resource
     _resource = 0
 
+    kwargs = {}
     key = None
     if key_on == 'key_value':
         key = 'some_common_key'
@@ -138,7 +139,7 @@ def test_open_local_sub_to_stream():
     N local tasks using ``trionics.maybe_open_context():``.
 
     '''
-    timeout: float = 3.6 if platform.system() != "Windows" else 10
+    timeout = 3 if platform.system() != "Windows" else 10
 
     async def main():
 

tests/test_rpc.py

@@ -1,8 +1,6 @@
-'''
-RPC (or maybe better labelled as "RTS: remote task scheduling"?)
-related API and error checks.
-
-'''
+"""
+RPC related
+"""
 import itertools
 
 import pytest
@@ -15,19 +13,9 @@ async def sleep_back_actor(
     func_name,
     func_defined,
     exposed_mods,
-    *,
-    reg_addr: tuple,
 ):
     if actor_name:
-        async with tractor.find_actor(
-            actor_name,
-            # NOTE: must be set manually since
-            # the subactor doesn't have the reg_addr
-            # fixture code run in it!
-            # TODO: maybe we should just set this once in the
-            # _state mod and derive to all children?
-            registry_addrs=[reg_addr],
-        ) as portal:
+        async with tractor.find_actor(actor_name) as portal:
             try:
                 await portal.run(__name__, func_name)
             except tractor.RemoteActorError as err:
@@ -36,7 +24,7 @@ async def sleep_back_actor(
                 if not exposed_mods:
                     expect = tractor.ModuleNotExposed
 
-                assert err.boxed_type is expect
+                assert err.type is expect
                 raise
     else:
         await trio.sleep(float('inf'))
@@ -54,25 +42,14 @@ async def short_sleep():
         (['tmp_mod'], 'import doggy', ModuleNotFoundError),
         (['tmp_mod'], '4doggy', SyntaxError),
     ],
-    ids=[
-        'no_mods',
-        'this_mod',
-        'this_mod_bad_func',
-        'fail_to_import',
-        'fail_on_syntax',
-    ],
+    ids=['no_mods', 'this_mod', 'this_mod_bad_func', 'fail_to_import',
+         'fail_on_syntax'],
 )
-def test_rpc_errors(
-    reg_addr,
-    to_call,
-    testdir,
-):
-    '''
-    Test errors when making various RPC requests to an actor
+def test_rpc_errors(arb_addr, to_call, testdir):
+    """Test errors when making various RPC requests to an actor
     that either doesn't have the requested module exposed or doesn't define
     the named function.
-
-    '''
+    """
     exposed_mods, funcname, inside_err = to_call
     subactor_exposed_mods = []
     func_defined = globals().get(funcname, False)
@@ -100,13 +77,8 @@ def test_rpc_errors(
 
         # spawn a subactor which calls us back
         async with tractor.open_nursery(
-            registry_addrs=[reg_addr],
+            arbiter_addr=arb_addr,
             enable_modules=exposed_mods.copy(),
-
-            # NOTE: will halt test in REPL if uncommented, so only
-            # do that if actually debugging subactor but keep it
-            # disabled for the test.
-            # debug_mode=True,
         ) as n:
 
             actor = tractor.current_actor()
@@ -123,7 +95,6 @@ def test_rpc_errors(
                 exposed_mods=exposed_mods,
                 func_defined=True if func_defined else False,
                 enable_modules=subactor_exposed_mods,
-                reg_addr=reg_addr,
             )
 
     def run():
@@ -134,20 +105,18 @@ def test_rpc_errors(
         run()
     else:
         # underlying errors aren't propagated upwards (yet)
-        with pytest.raises(
-            expected_exception=(remote_err, ExceptionGroup),
-        ) as err:
+        with pytest.raises(remote_err) as err:
             run()
 
         # get raw instance from pytest wrapper
         value = err.value
 
         # might get multiple `trio.Cancelled`s as well inside an inception
-        if isinstance(value, ExceptionGroup):
+        if isinstance(value, trio.MultiError):
             value = next(itertools.dropwhile(
                 lambda exc: not isinstance(exc, tractor.RemoteActorError),
                 value.exceptions
             ))
 
         if getattr(value, 'type', None):
-            assert value.boxed_type is inside_err
+            assert value.type is inside_err

tests/test_runtime.py

@@ -8,7 +8,7 @@ import pytest
 import trio
 import tractor
 
-from tractor._testing import tractor_test
+from conftest import tractor_test
 
 
 _file_path: str = ''
@@ -64,8 +64,7 @@ async def test_lifetime_stack_wipes_tmpfile(
 
     except (
         tractor.RemoteActorError,
-        # tractor.BaseExceptionGroup,
-        BaseExceptionGroup,
+        tractor.BaseExceptionGroup,
     ):
         pass
 

tests/test_shm.py

@@ -1,167 +0,0 @@
-"""
-Shared mem primitives and APIs.
-
-"""
-import uuid
-
-# import numpy
-import pytest
-import trio
-import tractor
-from tractor._shm import (
-    open_shm_list,
-    attach_shm_list,
-)
-
-
-@tractor.context
-async def child_attach_shml_alot(
-    ctx: tractor.Context,
-    shm_key: str,
-) -> None:
-
-    await ctx.started(shm_key)
-
-    # now try to attach a boatload of times in a loop..
-    for _ in range(1000):
-        shml = attach_shm_list(
-            key=shm_key,
-            readonly=False,
-        )
-        assert shml.shm.name == shm_key
-        await trio.sleep(0.001)
-
-
-def test_child_attaches_alot():
-    async def main():
-        async with tractor.open_nursery() as an:
-
-            # allocate writeable list in parent
-            key = f'shml_{uuid.uuid4()}'
-            shml = open_shm_list(
-                key=key,
-            )
-
-            portal = await an.start_actor(
-                'shm_attacher',
-                enable_modules=[__name__],
-            )
-
-            async with (
-                portal.open_context(
-                    child_attach_shml_alot,
-                    shm_key=shml.key,
-                ) as (ctx, start_val),
-            ):
-                assert start_val == key
-                await ctx.result()
-
-            await portal.cancel_actor()
-
-    trio.run(main)
-
-
-@tractor.context
-async def child_read_shm_list(
-    ctx: tractor.Context,
-    shm_key: str,
-    use_str: bool,
-    frame_size: int,
-) -> None:
-
-    # attach in child
-    shml = attach_shm_list(
-        key=shm_key,
-        # dtype=str if use_str else float,
-    )
-    await ctx.started(shml.key)
-
-    async with ctx.open_stream() as stream:
-        async for i in stream:
-            print(f'(child): reading shm list index: {i}')
-
-            if use_str:
-                expect = str(float(i))
-            else:
-                expect = float(i)
-
-            if frame_size == 1:
-                val = shml[i]
-                assert expect == val
-                print(f'(child): reading value: {val}')
-            else:
-                frame = shml[i - frame_size:i]
-                print(f'(child): reading frame: {frame}')
-
-
-@pytest.mark.parametrize(
-    'use_str',
-    [False, True],
-    ids=lambda i: f'use_str_values={i}',
-)
-@pytest.mark.parametrize(
-    'frame_size',
-    [1, 2**6, 2**10],
-    ids=lambda i: f'frame_size={i}',
-)
-def test_parent_writer_child_reader(
-    use_str: bool,
-    frame_size: int,
-):
-
-    async def main():
-        async with tractor.open_nursery(
-            # debug_mode=True,
-        ) as an:
-
-            portal = await an.start_actor(
-                'shm_reader',
-                enable_modules=[__name__],
-                debug_mode=True,
-            )
-
-            # allocate writeable list in parent
-            key = 'shm_list'
-            seq_size = int(2 * 2 ** 10)
-            shml = open_shm_list(
-                key=key,
-                size=seq_size,
-                dtype=str if use_str else float,
-                readonly=False,
-            )
-
-            async with (
-                portal.open_context(
-                    child_read_shm_list,
-                    shm_key=key,
-                    use_str=use_str,
-                    frame_size=frame_size,
-                ) as (ctx, sent),
-
-                ctx.open_stream() as stream,
-            ):
-
-                assert sent == key
-
-                for i in range(seq_size):
-
-                    val = float(i)
-                    if use_str:
-                        val = str(val)
-
-                    # print(f'(parent): writing {val}')
-                    shml[i] = val
-
-                    # only on frame fills do we
-                    # signal to the child that a frame's
-                    # worth is ready.
-                    if (i % frame_size) == 0:
-                        print(f'(parent): signalling frame full on {val}')
-                        await stream.send(i)
-                else:
-                    print(f'(parent): signalling final frame on {val}')
-                    await stream.send(i)
-
-            await portal.cancel_actor()
-
-    trio.run(main)

tests/test_spawning.py

@@ -2,15 +2,13 @@
 Spawning basics
 
 """
-from typing import (
-    Any,
-)
+from typing import Optional
 
 import pytest
 import trio
 import tractor
 
-from tractor._testing import tractor_test
+from conftest import tractor_test
 
 data_to_pass_down = {'doggy': 10, 'kitty': 4}
 
@@ -18,21 +16,24 @@ data_to_pass_down = {'doggy': 10, 'kitty': 4}
 async def spawn(
     is_arbiter: bool,
     data: dict,
-    reg_addr: tuple[str, int],
+    arb_addr: tuple[str, int],
 ):
     namespaces = [__name__]
 
     await trio.sleep(0.1)
 
     async with tractor.open_root_actor(
-        arbiter_addr=reg_addr,
+        arbiter_addr=arb_addr,
     ):
+
         actor = tractor.current_actor()
         assert actor.is_arbiter == is_arbiter
         data = data_to_pass_down
 
         if actor.is_arbiter:
-            async with tractor.open_nursery() as nursery:
+
+            async with tractor.open_nursery(
+            ) as nursery:
 
                 # forks here
                 portal = await nursery.run_in_actor(
@@ -40,7 +41,7 @@ async def spawn(
                     is_arbiter=False,
                     name='sub-actor',
                     data=data,
-                    reg_addr=reg_addr,
+                    arb_addr=arb_addr,
                     enable_modules=namespaces,
                 )
 
@@ -54,14 +55,12 @@ async def spawn(
             return 10
 
 
-def test_local_arbiter_subactor_global_state(
-    reg_addr,
-):
+def test_local_arbiter_subactor_global_state(arb_addr):
     result = trio.run(
         spawn,
         True,
         data_to_pass_down,
-        reg_addr,
+        arb_addr,
     )
     assert result == 10
 
@@ -95,9 +94,7 @@ async def test_movie_theatre_convo(start_method):
         await portal.cancel_actor()
 
 
-async def cellar_door(
-    return_value: str|None,
-):
+async def cellar_door(return_value: Optional[str]):
     return return_value
 
 
@@ -107,18 +104,16 @@ async def cellar_door(
 )
 @tractor_test
 async def test_most_beautiful_word(
-    start_method: str,
-    return_value: Any,
-    debug_mode: bool,
+    start_method,
+    return_value
 ):
     '''
     The main ``tractor`` routine.
 
     '''
     with trio.fail_after(1):
-        async with tractor.open_nursery(
-            debug_mode=debug_mode,
-        ) as n:
+        async with tractor.open_nursery() as n:
+
             portal = await n.run_in_actor(
                 cellar_door,
                 return_value=return_value,
@@ -145,7 +140,7 @@ async def check_loglevel(level):
 def test_loglevel_propagated_to_subactor(
     start_method,
     capfd,
-    reg_addr,
+    arb_addr,
 ):
     if start_method == 'mp_forkserver':
         pytest.skip(
@@ -157,7 +152,7 @@ def test_loglevel_propagated_to_subactor(
         async with tractor.open_nursery(
             name='arbiter',
             start_method=start_method,
-            arbiter_addr=reg_addr,
+            arbiter_addr=arb_addr,
 
         ) as tn:
             await tn.run_in_actor(

tests/test_task_broadcasting.py

@@ -66,13 +66,13 @@ async def ensure_sequence(
 async def open_sequence_streamer(
 
     sequence: list[int],
-    reg_addr: tuple[str, int],
+    arb_addr: tuple[str, int],
     start_method: str,
 
 ) -> tractor.MsgStream:
 
     async with tractor.open_nursery(
-        arbiter_addr=reg_addr,
+        arbiter_addr=arb_addr,
         start_method=start_method,
     ) as tn:
 
@@ -86,14 +86,14 @@ async def open_sequence_streamer(
         ) as (ctx, first):
 
             assert first is None
-            async with ctx.open_stream(allow_overruns=True) as stream:
+            async with ctx.open_stream(backpressure=True) as stream:
                 yield stream
 
         await portal.cancel_actor()
 
 
 def test_stream_fan_out_to_local_subscriptions(
-    reg_addr,
+    arb_addr,
     start_method,
 ):
 
@@ -103,7 +103,7 @@ def test_stream_fan_out_to_local_subscriptions(
 
         async with open_sequence_streamer(
             sequence,
-            reg_addr,
+            arb_addr,
             start_method,
         ) as stream:
 
@@ -138,7 +138,7 @@ def test_stream_fan_out_to_local_subscriptions(
     ]
 )
 def test_consumer_and_parent_maybe_lag(
-    reg_addr,
+    arb_addr,
     start_method,
     task_delays,
 ):
@@ -150,7 +150,7 @@ def test_consumer_and_parent_maybe_lag(
 
         async with open_sequence_streamer(
             sequence,
-            reg_addr,
+            arb_addr,
             start_method,
         ) as stream:
 
@@ -211,7 +211,7 @@ def test_consumer_and_parent_maybe_lag(
 
 
 def test_faster_task_to_recv_is_cancelled_by_slower(
-    reg_addr,
+    arb_addr,
     start_method,
 ):
     '''
@@ -225,7 +225,7 @@ def test_faster_task_to_recv_is_cancelled_by_slower(
 
         async with open_sequence_streamer(
             sequence,
-            reg_addr,
+            arb_addr,
             start_method,
 
         ) as stream:
@@ -302,7 +302,7 @@ def test_subscribe_errors_after_close():
 
 
 def test_ensure_slow_consumers_lag_out(
-    reg_addr,
+    arb_addr,
     start_method,
 ):
     '''This is a pure local task test; no tractor
@@ -413,8 +413,8 @@ def test_ensure_slow_consumers_lag_out(
                     seq = brx._state.subs[brx.key]
                     assert seq == len(brx._state.queue) - 1
 
-                # all no_overruns entries in the underlying
-                # channel should have been copied into the bcaster
+                # all backpressured entries in the underlying
+                # channel should have been copied into the caster
                 # queue trailing-window
                 async for i in rx:
                     print(f'bped: {i}')

tests/test_trioisms.py

@@ -5,7 +5,7 @@ want to see changed.
 '''
 import pytest
 import trio
-from trio import TaskStatus
+from trio_typing import TaskStatus
 
 
 @pytest.mark.parametrize(

tractor/__init__.py

@@ -15,53 +15,72 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 """
-tractor: structured concurrent ``trio``-"actors".
+tractor: structured concurrent "actors".
 
 """
-from ._clustering import (
-    open_actor_cluster as open_actor_cluster,
-)
-from ._context import (
-    Context as Context,  # the type
-    context as context,  # a func-decorator
-)
+from exceptiongroup import BaseExceptionGroup
+
+from ._clustering import open_actor_cluster
+from ._ipc import Channel
 from ._streaming import (
-    MsgStream as MsgStream,
-    stream as stream,
+    Context,
+    MsgStream,
+    stream,
+    context,
 )
 from ._discovery import (
-    get_registry as get_registry,
-    find_actor as find_actor,
-    wait_for_actor as wait_for_actor,
-    query_actor as query_actor,
-)
-from ._supervise import (
-    open_nursery as open_nursery,
-    ActorNursery as ActorNursery,
+    get_arbiter,
+    find_actor,
+    wait_for_actor,
+    query_actor,
 )
+from ._supervise import open_nursery
 from ._state import (
-    current_actor as current_actor,
-    is_root_process as is_root_process,
-    current_ipc_ctx as current_ipc_ctx,
+    current_actor,
+    is_root_process,
 )
 from ._exceptions import (
-    ContextCancelled as ContextCancelled,
-    ModuleNotExposed as ModuleNotExposed,
-    MsgTypeError as MsgTypeError,
-    RemoteActorError as RemoteActorError,
-    TransportClosed as TransportClosed,
+    RemoteActorError,
+    ModuleNotExposed,
+    ContextCancelled,
 )
-from .devx import (
-    breakpoint as breakpoint,
-    pause as pause,
-    pause_from_sync as pause_from_sync,
-    post_mortem as post_mortem,
+from ._debug import (
+    breakpoint,
+    post_mortem,
 )
-from . import msg as msg
+from . import msg
 from ._root import (
-    run_daemon as run_daemon,
-    open_root_actor as open_root_actor,
+    run_daemon,
+    open_root_actor,
 )
-from ._ipc import Channel as Channel
-from ._portal import Portal as Portal
-from ._runtime import Actor as Actor
+from ._portal import Portal
+from ._runtime import Actor
+
+
+__all__ = [
+    'Actor',
+    'Channel',
+    'Context',
+    'ContextCancelled',
+    'ModuleNotExposed',
+    'MsgStream',
+    'BaseExceptionGroup',
+    'Portal',
+    'RemoteActorError',
+    'breakpoint',
+    'context',
+    'current_actor',
+    'find_actor',
+    'get_arbiter',
+    'is_root_process',
+    'msg',
+    'open_actor_cluster',
+    'open_nursery',
+    'open_root_actor',
+    'post_mortem',
+    'query_actor',
+    'run_daemon',
+    'stream',
+    'to_asyncio',
+    'wait_for_actor',
+]

tractor/_child.py

@@ -18,6 +18,8 @@
 This is the "bootloader" for actors started using the native trio backend.
 
 """
+import sys
+import trio
 import argparse
 
 from ast import literal_eval
@@ -35,8 +37,9 @@ def parse_ipaddr(arg):
     return (str(host), int(port))
 
 
+from ._entry import _trio_main
+
 if __name__ == "__main__":
-    __tracebackhide__: bool = True
 
     parser = argparse.ArgumentParser()
     parser.add_argument("--uid", type=parse_uid)

tractor/_debug.py

@@ -0,0 +1,922 @@
+# tractor: structured concurrent "actors".
+# Copyright 2018-eternity Tyler Goodlet.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+"""
+Multi-core debugging for da peeps!
+
+"""
+from __future__ import annotations
+import bdb
+import os
+import sys
+import signal
+from functools import (
+    partial,
+    cached_property,
+)
+from contextlib import asynccontextmanager as acm
+from typing import (
+    Any,
+    Optional,
+    Callable,
+    AsyncIterator,
+    AsyncGenerator,
+)
+from types import FrameType
+
+import pdbp
+import tractor
+import trio
+from trio_typing import TaskStatus
+
+from .log import get_logger
+from ._discovery import get_root
+from ._state import (
+    is_root_process,
+    debug_mode,
+)
+from ._exceptions import (
+    is_multi_cancelled,
+    ContextCancelled,
+)
+from ._ipc import Channel
+
+log = get_logger(__name__)
+
+
+__all__ = ['breakpoint', 'post_mortem']
+
+
+class Lock:
+    '''
+    Actor global debug lock state.
+
+    Mostly to avoid a lot of ``global`` declarations for now XD.
+
+    '''
+    repl: MultiActorPdb | None = None
+    # placeholder for function to set a ``trio.Event`` on debugger exit
+    # pdb_release_hook: Optional[Callable] = None
+
+    _trio_handler: Callable[
+        [int, Optional[FrameType]], Any
+    ] | int | None = None
+
+    # actor-wide variable pointing to current task name using debugger
+    local_task_in_debug: str | None = None
+
+    # NOTE: set by the current task waiting on the root tty lock from
+    # the CALLER side of the `lock_tty_for_child()` context entry-call
+    # and must be cancelled if this actor is cancelled via IPC
+    # request-message otherwise deadlocks with the parent actor may
+    # ensure
+    _debugger_request_cs: Optional[trio.CancelScope] = None
+
+    # NOTE: set only in the root actor for the **local** root spawned task
+    # which has acquired the lock (i.e. this is on the callee side of
+    # the `lock_tty_for_child()` context entry).
+    _root_local_task_cs_in_debug: Optional[trio.CancelScope] = None
+
+    # actor tree-wide actor uid that supposedly has the tty lock
+    global_actor_in_debug: Optional[tuple[str, str]] = None
+
+    local_pdb_complete: Optional[trio.Event] = None
+    no_remote_has_tty: Optional[trio.Event] = None
+
+    # lock in root actor preventing multi-access to local tty
+    _debug_lock: trio.StrictFIFOLock = trio.StrictFIFOLock()
+
+    _orig_sigint_handler: Optional[Callable] = None
+    _blocked: set[tuple[str, str]] = set()
+
+    @classmethod
+    def shield_sigint(cls):
+        cls._orig_sigint_handler = signal.signal(
+            signal.SIGINT,
+            shield_sigint_handler,
+        )
+
+    @classmethod
+    def unshield_sigint(cls):
+        # always restore ``trio``'s sigint handler. see notes below in
+        # the pdb factory about the nightmare that is that code swapping
+        # out the handler when the repl activates...
+        signal.signal(signal.SIGINT, cls._trio_handler)
+        cls._orig_sigint_handler = None
+
+    @classmethod
+    def release(cls):
+        try:
+            cls._debug_lock.release()
+        except RuntimeError:
+            # uhhh makes no sense but been seeing the non-owner
+            # release error even though this is definitely the task
+            # that locked?
+            owner = cls._debug_lock.statistics().owner
+            if owner:
+                raise
+
+        # actor-local state, irrelevant for non-root.
+        cls.global_actor_in_debug = None
+        cls.local_task_in_debug = None
+
+        try:
+            # sometimes the ``trio`` might already be terminated in
+            # which case this call will raise.
+            if cls.local_pdb_complete is not None:
+                cls.local_pdb_complete.set()
+        finally:
+            # restore original sigint handler
+            cls.unshield_sigint()
+            cls.repl = None
+
+
+class TractorConfig(pdbp.DefaultConfig):
+    '''
+    Custom ``pdbp`` goodness :surfer:
+
+    '''
+    use_pygments: bool = True
+    sticky_by_default: bool = False
+    enable_hidden_frames: bool = False
+
+    # much thanks @mdmintz for the hot tip!
+    # fixes line spacing issue when resizing terminal B)
+    truncate_long_lines: bool = False
+
+
+class MultiActorPdb(pdbp.Pdb):
+    '''
+    Add teardown hooks to the regular ``pdbp.Pdb``.
+
+    '''
+    # override the pdbp config with our coolio one
+    DefaultConfig = TractorConfig
+
+    # def preloop(self):
+    #     print('IN PRELOOP')
+    #     super().preloop()
+
+    # TODO: figure out how to disallow recursive .set_trace() entry
+    # since that'll cause deadlock for us.
+    def set_continue(self):
+        try:
+            super().set_continue()
+        finally:
+            Lock.release()
+
+    def set_quit(self):
+        try:
+            super().set_quit()
+        finally:
+            Lock.release()
+
+    # XXX NOTE: we only override this because apparently the stdlib pdb
+    # bois likes to touch the SIGINT handler as much as i like to touch
+    # my d$%&.
+    def _cmdloop(self):
+        self.cmdloop()
+
+    @cached_property
+    def shname(self) -> str | None:
+        '''
+        Attempt to return the login shell name with a special check for
+        the infamous `xonsh` since it seems to have some issues much
+        different from std shells when it comes to flushing the prompt?
+
+        '''
+        # SUPER HACKY and only really works if `xonsh` is not used
+        # before spawning further sub-shells..
+        shpath = os.getenv('SHELL', None)
+
+        if shpath:
+            if (
+                os.getenv('XONSH_LOGIN', default=False)
+                or 'xonsh' in shpath
+            ):
+                return 'xonsh'
+
+            return os.path.basename(shpath)
+
+        return None
+
+
+@acm
+async def _acquire_debug_lock_from_root_task(
+    uid: tuple[str, str]
+
+) -> AsyncIterator[trio.StrictFIFOLock]:
+    '''
+    Acquire a root-actor local FIFO lock which tracks mutex access of
+    the process tree's global debugger breakpoint.
+
+    This lock avoids tty clobbering (by preventing multiple processes
+    reading from stdstreams) and ensures multi-actor, sequential access
+    to the ``pdb`` repl.
+
+    '''
+    task_name = trio.lowlevel.current_task().name
+
+    log.runtime(
+        f"Attempting to acquire TTY lock, remote task: {task_name}:{uid}"
+    )
+
+    we_acquired = False
+
+    try:
+        log.runtime(
+            f"entering lock checkpoint, remote task: {task_name}:{uid}"
+        )
+        we_acquired = True
+
+        # NOTE: if the surrounding cancel scope from the
+        # `lock_tty_for_child()` caller is cancelled, this line should
+        # unblock and NOT leave us in some kind of
+        # a "child-locked-TTY-but-child-is-uncontactable-over-IPC"
+        # condition.
+        await Lock._debug_lock.acquire()
+
+        if Lock.no_remote_has_tty is None:
+            # mark the tty lock as being in use so that the runtime
+            # can try to avoid clobbering any connection from a child
+            # that's currently relying on it.
+            Lock.no_remote_has_tty = trio.Event()
+
+        Lock.global_actor_in_debug = uid
+        log.runtime(f"TTY lock acquired, remote task: {task_name}:{uid}")
+
+        # NOTE: critical section: this yield is unshielded!
+
+        # IF we received a cancel during the shielded lock entry of some
+        # next-in-queue requesting task, then the resumption here will
+        # result in that ``trio.Cancelled`` being raised to our caller
+        # (likely from ``lock_tty_for_child()`` below)!  In
+        # this case the ``finally:`` below should trigger and the
+        # surrounding caller side context should cancel normally
+        # relaying back to the caller.
+
+        yield Lock._debug_lock
+
+    finally:
+        if (
+            we_acquired
+            and Lock._debug_lock.locked()
+        ):
+            Lock._debug_lock.release()
+
+        # IFF there are no more requesting tasks queued up fire, the
+        # "tty-unlocked" event thereby alerting any monitors of the lock that
+        # we are now back in the "tty unlocked" state. This is basically
+        # and edge triggered signal around an empty queue of sub-actor
+        # tasks that may have tried to acquire the lock.
+        stats = Lock._debug_lock.statistics()
+        if (
+            not stats.owner
+        ):
+            log.runtime(f"No more tasks waiting on tty lock! says {uid}")
+            if Lock.no_remote_has_tty is not None:
+                Lock.no_remote_has_tty.set()
+                Lock.no_remote_has_tty = None
+
+        Lock.global_actor_in_debug = None
+
+        log.runtime(
+            f"TTY lock released, remote task: {task_name}:{uid}"
+        )
+
+
+@tractor.context
+async def lock_tty_for_child(
+
+    ctx: tractor.Context,
+    subactor_uid: tuple[str, str]
+
+) -> str:
+    '''
+    Lock the TTY in the root process of an actor tree in a new
+    inter-actor-context-task such that the ``pdbp`` debugger console
+    can be mutex-allocated to the calling sub-actor for REPL control
+    without interference by other processes / threads.
+
+    NOTE: this task must be invoked in the root process of the actor
+    tree. It is meant to be invoked as an rpc-task and should be
+    highly reliable at releasing the mutex complete!
+
+    '''
+    task_name = trio.lowlevel.current_task().name
+
+    if tuple(subactor_uid) in Lock._blocked:
+        log.warning(
+            f'Actor {subactor_uid} is blocked from acquiring debug lock\n'
+            f"remote task: {task_name}:{subactor_uid}"
+        )
+        ctx._enter_debugger_on_cancel = False
+        await ctx.cancel(f'Debug lock blocked for {subactor_uid}')
+        return 'pdb_lock_blocked'
+
+    # TODO: when we get to true remote debugging
+    # this will deliver stdin data?
+
+    log.debug(
+        "Attempting to acquire TTY lock\n"
+        f"remote task: {task_name}:{subactor_uid}"
+    )
+
+    log.debug(f"Actor {subactor_uid} is WAITING on stdin hijack lock")
+    Lock.shield_sigint()
+
+    try:
+        with (
+            trio.CancelScope(shield=True) as debug_lock_cs,
+        ):
+            Lock._root_local_task_cs_in_debug = debug_lock_cs
+            async with _acquire_debug_lock_from_root_task(subactor_uid):
+
+                # indicate to child that we've locked stdio
+                await ctx.started('Locked')
+                log.debug(
+                    f"Actor {subactor_uid} acquired stdin hijack lock"
+                )
+
+                # wait for unlock pdb by child
+                async with ctx.open_stream() as stream:
+                    assert await stream.receive() == 'pdb_unlock'
+
+        return "pdb_unlock_complete"
+
+    finally:
+        Lock._root_local_task_cs_in_debug = None
+        Lock.unshield_sigint()
+
+
+async def wait_for_parent_stdin_hijack(
+    actor_uid: tuple[str, str],
+    task_status: TaskStatus[trio.CancelScope] = trio.TASK_STATUS_IGNORED
+):
+    '''
+    Connect to the root actor via a ``Context`` and invoke a task which
+    locks a root-local TTY lock: ``lock_tty_for_child()``; this func
+    should be called in a new task from a child actor **and never the
+    root*.
+
+    This function is used by any sub-actor to acquire mutex access to
+    the ``pdb`` REPL and thus the root's TTY for interactive debugging
+    (see below inside ``_breakpoint()``). It can be used to ensure that
+    an intermediate nursery-owning actor does not clobber its children
+    if they are in debug (see below inside
+    ``maybe_wait_for_debugger()``).
+
+    '''
+    with trio.CancelScope(shield=True) as cs:
+        Lock._debugger_request_cs = cs
+
+        try:
+            async with get_root() as portal:
+
+                # this syncs to child's ``Context.started()`` call.
+                async with portal.open_context(
+
+                    tractor._debug.lock_tty_for_child,
+                    subactor_uid=actor_uid,
+
+                ) as (ctx, val):
+
+                    log.debug('locked context')
+                    assert val == 'Locked'
+
+                    async with ctx.open_stream() as stream:
+                        # unblock local caller
+
+                        try:
+                            assert Lock.local_pdb_complete
+                            task_status.started(cs)
+                            await Lock.local_pdb_complete.wait()
+
+                        finally:
+                            # TODO: shielding currently can cause hangs...
+                            # with trio.CancelScope(shield=True):
+                            await stream.send('pdb_unlock')
+
+                        # sync with callee termination
+                        assert await ctx.result() == "pdb_unlock_complete"
+
+                log.debug('exitting child side locking task context')
+
+        except ContextCancelled:
+            log.warning('Root actor cancelled debug lock')
+            raise
+
+        finally:
+            Lock.local_task_in_debug = None
+            log.debug('Exiting debugger from child')
+
+
+def mk_mpdb() -> tuple[MultiActorPdb, Callable]:
+
+    pdb = MultiActorPdb()
+    # signal.signal = pdbp.hideframe(signal.signal)
+
+    Lock.shield_sigint()
+
+    # XXX: These are the important flags mentioned in
+    # https://github.com/python-trio/trio/issues/1155
+    # which resolve the traceback spews to console.
+    pdb.allow_kbdint = True
+    pdb.nosigint = True
+
+    return pdb, Lock.unshield_sigint
+
+
+async def _breakpoint(
+
+    debug_func,
+
+    # TODO:
+    # shield: bool = False
+
+) -> None:
+    '''
+    Breakpoint entry for engaging debugger instance sync-interaction,
+    from async code, executing in actor runtime (task).
+
+    '''
+    __tracebackhide__ = True
+    actor = tractor.current_actor()
+    pdb, undo_sigint = mk_mpdb()
+    task_name = trio.lowlevel.current_task().name
+
+    # TODO: is it possible to debug a trio.Cancelled except block?
+    # right now it seems like we can kinda do with by shielding
+    # around ``tractor.breakpoint()`` but not if we move the shielded
+    # scope here???
+    # with trio.CancelScope(shield=shield):
+    #     await trio.lowlevel.checkpoint()
+
+    if (
+        not Lock.local_pdb_complete
+        or Lock.local_pdb_complete.is_set()
+    ):
+        Lock.local_pdb_complete = trio.Event()
+
+    # TODO: need a more robust check for the "root" actor
+    if (
+        not is_root_process()
+        and actor._parent_chan  # a connected child
+    ):
+
+        if Lock.local_task_in_debug:
+
+            # Recurrence entry case: this task already has the lock and
+            # is likely recurrently entering a breakpoint
+            if Lock.local_task_in_debug == task_name:
+                # noop on recurrent entry case but we want to trigger
+                # a checkpoint to allow other actors error-propagate and
+                # potetially avoid infinite re-entries in some subactor.
+                await trio.lowlevel.checkpoint()
+                return
+
+            # if **this** actor is already in debug mode block here
+            # waiting for the control to be released - this allows
+            # support for recursive entries to `tractor.breakpoint()`
+            log.warning(f"{actor.uid} already has a debug lock, waiting...")
+
+            await Lock.local_pdb_complete.wait()
+            await trio.sleep(0.1)
+
+        # mark local actor as "in debug mode" to avoid recurrent
+        # entries/requests to the root process
+        Lock.local_task_in_debug = task_name
+
+        # this **must** be awaited by the caller and is done using the
+        # root nursery so that the debugger can continue to run without
+        # being restricted by the scope of a new task nursery.
+
+        # TODO: if we want to debug a trio.Cancelled triggered exception
+        # we have to figure out how to avoid having the service nursery
+        # cancel on this task start? I *think* this works below:
+        # ```python
+        #   actor._service_n.cancel_scope.shield = shield
+        # ```
+        # but not entirely sure if that's a sane way to implement it?
+        try:
+            with trio.CancelScope(shield=True):
+                await actor._service_n.start(
+                    wait_for_parent_stdin_hijack,
+                    actor.uid,
+                )
+                Lock.repl = pdb
+        except RuntimeError:
+            Lock.release()
+
+            if actor._cancel_called:
+                # service nursery won't be usable and we
+                # don't want to lock up the root either way since
+                # we're in (the midst of) cancellation.
+                return
+
+            raise
+
+    elif is_root_process():
+
+        # we also wait in the root-parent for any child that
+        # may have the tty locked prior
+        # TODO: wait, what about multiple root tasks acquiring it though?
+        if Lock.global_actor_in_debug == actor.uid:
+            # re-entrant root process already has it: noop.
+            return
+
+        # XXX: since we need to enter pdb synchronously below,
+        # we have to release the lock manually from pdb completion
+        # callbacks. Can't think of a nicer way then this atm.
+        if Lock._debug_lock.locked():
+            log.warning(
+                'Root actor attempting to shield-acquire active tty lock'
+                f' owned by {Lock.global_actor_in_debug}')
+
+            # must shield here to avoid hitting a ``Cancelled`` and
+            # a child getting stuck bc we clobbered the tty
+            with trio.CancelScope(shield=True):
+                await Lock._debug_lock.acquire()
+        else:
+            # may be cancelled
+            await Lock._debug_lock.acquire()
+
+        Lock.global_actor_in_debug = actor.uid
+        Lock.local_task_in_debug = task_name
+        Lock.repl = pdb
+
+    try:
+        # block here one (at the appropriate frame *up*) where
+        # ``breakpoint()`` was awaited and begin handling stdio.
+        log.debug("Entering the synchronous world of pdb")
+        debug_func(actor, pdb)
+
+    except bdb.BdbQuit:
+        Lock.release()
+        raise
+
+    # XXX: apparently we can't do this without showing this frame
+    # in the backtrace on first entry to the REPL? Seems like an odd
+    # behaviour that should have been fixed by now. This is also why
+    # we scrapped all the @cm approaches that were tried previously.
+    # finally:
+    #     __tracebackhide__ = True
+    #     # frame = sys._getframe()
+    #     # last_f = frame.f_back
+    #     # last_f.f_globals['__tracebackhide__'] = True
+    #     # signal.signal = pdbp.hideframe(signal.signal)
+
+
+def shield_sigint_handler(
+    signum: int,
+    frame: 'frame',  # type: ignore # noqa
+    # pdb_obj: Optional[MultiActorPdb] = None,
+    *args,
+
+) -> None:
+    '''
+    Specialized, debugger-aware SIGINT handler.
+
+    In childred we always ignore to avoid deadlocks since cancellation
+    should always be managed by the parent supervising actor. The root
+    is always cancelled on ctrl-c.
+
+    '''
+    __tracebackhide__ = True
+
+    uid_in_debug = Lock.global_actor_in_debug
+
+    actor = tractor.current_actor()
+    # print(f'{actor.uid} in HANDLER with ')
+
+    def do_cancel():
+        # If we haven't tried to cancel the runtime then do that instead
+        # of raising a KBI (which may non-gracefully destroy
+        # a ``trio.run()``).
+        if not actor._cancel_called:
+            actor.cancel_soon()
+
+        # If the runtime is already cancelled it likely means the user
+        # hit ctrl-c again because teardown didn't full take place in
+        # which case we do the "hard" raising of a local KBI.
+        else:
+            raise KeyboardInterrupt
+
+    any_connected = False
+
+    if uid_in_debug is not None:
+        # try to see if the supposed (sub)actor in debug still
+        # has an active connection to *this* actor, and if not
+        # it's likely they aren't using the TTY lock / debugger
+        # and we should propagate SIGINT normally.
+        chans = actor._peers.get(tuple(uid_in_debug))
+        if chans:
+            any_connected = any(chan.connected() for chan in chans)
+            if not any_connected:
+                log.warning(
+                    'A global actor reported to be in debug '
+                    'but no connection exists for this child:\n'
+                    f'{uid_in_debug}\n'
+                    'Allowing SIGINT propagation..'
+                )
+                return do_cancel()
+
+    # only set in the actor actually running the REPL
+    pdb_obj = Lock.repl
+
+    # root actor branch that reports whether or not a child
+    # has locked debugger.
+    if (
+        is_root_process()
+        and uid_in_debug is not None
+
+        # XXX: only if there is an existing connection to the
+        # (sub-)actor in debug do we ignore SIGINT in this
+        # parent! Otherwise we may hang waiting for an actor
+        # which has already terminated to unlock.
+        and any_connected
+    ):
+        # we are root and some actor is in debug mode
+        # if uid_in_debug is not None:
+
+        if pdb_obj:
+            name = uid_in_debug[0]
+            if name != 'root':
+                log.pdb(
+                    f"Ignoring SIGINT, child in debug mode: `{uid_in_debug}`"
+                )
+
+            else:
+                log.pdb(
+                    "Ignoring SIGINT while in debug mode"
+                )
+    elif (
+        is_root_process()
+    ):
+        if pdb_obj:
+            log.pdb(
+                "Ignoring SIGINT since debug mode is enabled"
+            )
+
+        if (
+            Lock._root_local_task_cs_in_debug
+            and not Lock._root_local_task_cs_in_debug.cancel_called
+        ):
+            Lock._root_local_task_cs_in_debug.cancel()
+
+            # revert back to ``trio`` handler asap!
+            Lock.unshield_sigint()
+
+    # child actor that has locked the debugger
+    elif not is_root_process():
+
+        chan: Channel = actor._parent_chan
+        if not chan or not chan.connected():
+            log.warning(
+                'A global actor reported to be in debug '
+                'but no connection exists for its parent:\n'
+                f'{uid_in_debug}\n'
+                'Allowing SIGINT propagation..'
+            )
+            return do_cancel()
+
+        task = Lock.local_task_in_debug
+        if (
+            task
+            and pdb_obj
+        ):
+            log.pdb(
+                f"Ignoring SIGINT while task in debug mode: `{task}`"
+            )
+
+        # TODO: how to handle the case of an intermediary-child actor
+        # that **is not** marked in debug mode? See oustanding issue:
+        # https://github.com/goodboy/tractor/issues/320
+        # elif debug_mode():
+
+    else:  # XXX: shouldn't ever get here?
+        print("WTFWTFWTF")
+        raise KeyboardInterrupt
+
+    # NOTE: currently (at least on ``fancycompleter`` 0.9.2)
+    # it looks to be that the last command that was run (eg. ll)
+    # will be repeated by default.
+
+    # maybe redraw/print last REPL output to console since
+    # we want to alert the user that more input is expect since
+    # nothing has been done dur to ignoring sigint.
+    if (
+        pdb_obj  # only when this actor has a REPL engaged
+    ):
+        # XXX: yah, mega hack, but how else do we catch this madness XD
+        if pdb_obj.shname == 'xonsh':
+            pdb_obj.stdout.write(pdb_obj.prompt)
+
+        pdb_obj.stdout.flush()
+
+        # TODO: make this work like sticky mode where if there is output
+        # detected as written to the tty we redraw this part underneath
+        # and erase the past draw of this same bit above?
+        # pdb_obj.sticky = True
+        # pdb_obj._print_if_sticky()
+
+        # also see these links for an approach from ``ptk``:
+        # https://github.com/goodboy/tractor/issues/130#issuecomment-663752040
+        # https://github.com/prompt-toolkit/python-prompt-toolkit/blob/c2c6af8a0308f9e5d7c0e28cb8a02963fe0ce07a/prompt_toolkit/patch_stdout.py
+
+        # XXX LEGACY: lol, see ``pdbpp`` issue:
+        # https://github.com/pdbpp/pdbpp/issues/496
+
+
+def _set_trace(
+    actor: tractor.Actor | None = None,
+    pdb: MultiActorPdb | None = None,
+):
+    __tracebackhide__ = True
+    actor = actor or tractor.current_actor()
+
+    # start 2 levels up in user code
+    frame: Optional[FrameType] = sys._getframe()
+    if frame:
+        frame = frame.f_back  # type: ignore
+
+    if (
+        frame
+        and pdb
+        and actor is not None
+    ):
+        log.pdb(f"\nAttaching pdb to actor: {actor.uid}\n")
+        # no f!#$&* idea, but when we're in async land
+        # we need 2x frames up?
+        frame = frame.f_back
+
+    else:
+        pdb, undo_sigint = mk_mpdb()
+
+        # we entered the global ``breakpoint()`` built-in from sync
+        # code?
+        Lock.local_task_in_debug = 'sync'
+
+    pdb.set_trace(frame=frame)
+
+
+breakpoint = partial(
+    _breakpoint,
+    _set_trace,
+)
+
+
+def _post_mortem(
+    actor: tractor.Actor,
+    pdb: MultiActorPdb,
+
+) -> None:
+    '''
+    Enter the ``pdbpp`` port mortem entrypoint using our custom
+    debugger instance.
+
+    '''
+    log.pdb(f"\nAttaching to pdb in crashed actor: {actor.uid}\n")
+
+    # TODO: you need ``pdbpp`` master (at least this commit
+    # https://github.com/pdbpp/pdbpp/commit/b757794857f98d53e3ebbe70879663d7d843a6c2)
+    # to fix this and avoid the hang it causes. See issue:
+    # https://github.com/pdbpp/pdbpp/issues/480
+    # TODO: help with a 3.10+ major release if/when it arrives.
+
+    pdbp.xpm(Pdb=lambda: pdb)
+
+
+post_mortem = partial(
+    _breakpoint,
+    _post_mortem,
+)
+
+
+async def _maybe_enter_pm(err):
+    if (
+        debug_mode()
+
+        # NOTE: don't enter debug mode recursively after quitting pdb
+        # Iow, don't re-enter the repl if the `quit` command was issued
+        # by the user.
+        and not isinstance(err, bdb.BdbQuit)
+
+        # XXX: if the error is the likely result of runtime-wide
+        # cancellation, we don't want to enter the debugger since
+        # there's races between when the parent actor has killed all
+        # comms and when the child tries to contact said parent to
+        # acquire the tty lock.
+
+        # Really we just want to mostly avoid catching KBIs here so there
+        # might be a simpler check we can do?
+        and not is_multi_cancelled(err)
+    ):
+        log.debug("Actor crashed, entering debug mode")
+        try:
+            await post_mortem()
+        finally:
+            Lock.release()
+            return True
+
+    else:
+        return False
+
+
+@acm
+async def acquire_debug_lock(
+    subactor_uid: tuple[str, str],
+) -> AsyncGenerator[None, tuple]:
+    '''
+    Grab root's debug lock on entry, release on exit.
+
+    This helper is for actor's who don't actually need
+    to acquired the debugger but want to wait until the
+    lock is free in the process-tree root.
+
+    '''
+    if not debug_mode():
+        yield None
+        return
+
+    async with trio.open_nursery() as n:
+        cs = await n.start(
+            wait_for_parent_stdin_hijack,
+            subactor_uid,
+        )
+        yield None
+        cs.cancel()
+
+
+async def maybe_wait_for_debugger(
+    poll_steps: int = 2,
+    poll_delay: float = 0.1,
+    child_in_debug: bool = False,
+
+) -> None:
+
+    if (
+        not debug_mode()
+        and not child_in_debug
+    ):
+        return
+
+    if (
+        is_root_process()
+    ):
+        # If we error in the root but the debugger is
+        # engaged we don't want to prematurely kill (and
+        # thus clobber access to) the local tty since it
+        # will make the pdb repl unusable.
+        # Instead try to wait for pdb to be released before
+        # tearing down.
+
+        sub_in_debug = None
+
+        for _ in range(poll_steps):
+
+            if Lock.global_actor_in_debug:
+                sub_in_debug = tuple(Lock.global_actor_in_debug)
+
+            log.debug('Root polling for debug')
+
+            with trio.CancelScope(shield=True):
+                await trio.sleep(poll_delay)
+
+                # TODO: could this make things more deterministic?  wait
+                # to see if a sub-actor task will be scheduled and grab
+                # the tty lock on the next tick?
+                # XXX: doesn't seem to work
+                # await trio.testing.wait_all_tasks_blocked(cushion=0)
+
+                debug_complete = Lock.no_remote_has_tty
+                if (
+                    (debug_complete and
+                     not debug_complete.is_set())
+                ):
+                    log.debug(
+                        'Root has errored but pdb is in use by '
+                        f'child {sub_in_debug}\n'
+                        'Waiting on tty lock to release..')
+
+                    await debug_complete.wait()
+
+                await trio.sleep(poll_delay)
+                continue
+        else:
+            log.debug(
+                    'Root acquired TTY LOCK'
+            )

tractor/_discovery.py

@@ -15,71 +15,50 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 """
-Discovery (protocols) API for automatic addressing and location
-management of (service) actors.
+Actor discovery API.
 
 """
-from __future__ import annotations
 from typing import (
+    Optional,
+    Union,
     AsyncGenerator,
-    AsyncContextManager,
-    TYPE_CHECKING,
 )
 from contextlib import asynccontextmanager as acm
 
-from tractor.log import get_logger
-from .trionics import gather_contexts
 from ._ipc import _connect_chan, Channel
 from ._portal import (
     Portal,
     open_portal,
     LocalPortal,
 )
-from ._state import (
-    current_actor,
-    _runtime_vars,
-)
-
-if TYPE_CHECKING:
-    from ._runtime import Actor
-
-
-log = get_logger(__name__)
+from ._state import current_actor, _runtime_vars
 
 
 @acm
-async def get_registry(
+async def get_arbiter(
+
     host: str,
     port: int,
 
-) -> AsyncGenerator[
-    Portal | LocalPortal | None,
-    None,
-]:
+) -> AsyncGenerator[Union[Portal, LocalPortal], None]:
+    '''Return a portal instance connected to a local or remote
+    arbiter.
     '''
-    Return a portal instance connected to a local or remote
-    registry-service actor; if a connection already exists re-use it
-    (presumably to call a `.register_actor()` registry runtime RPC
-    ep).
+    actor = current_actor()
 
-    '''
-    actor: Actor = current_actor()
-    if actor.is_registrar:
+    if not actor:
+        raise RuntimeError("No actor instance has been defined yet?")
+
+    if actor.is_arbiter:
         # we're already the arbiter
         # (likely a re-entrant call from the arbiter actor)
-        yield LocalPortal(
-            actor,
-            Channel((host, port))
-        )
+        yield LocalPortal(actor, Channel((host, port)))
     else:
-        # TODO: try to look pre-existing connection from
-        # `Actor._peers` and use it instead?
-        async with (
-            _connect_chan(host, port) as chan,
-            open_portal(chan) as regstr_ptl,
-        ):
-            yield regstr_ptl
+        async with _connect_chan(host, port) as chan:
 
+            async with open_portal(chan) as arb_portal:
+
+                yield arb_portal
 
 
 @acm
@@ -87,125 +66,51 @@ async def get_root(
     **kwargs,
 ) -> AsyncGenerator[Portal, None]:
 
-    # TODO: rename mailbox to `_root_maddr` when we finally
-    # add and impl libp2p multi-addrs?
     host, port = _runtime_vars['_root_mailbox']
     assert host is not None
 
-    async with (
-        _connect_chan(host, port) as chan,
-        open_portal(chan, **kwargs) as portal,
-    ):
-        yield portal
-
-
-def get_peer_by_name(
-    name: str,
-    # uuid: str|None = None,
-
-) -> list[Channel]|None:  # at least 1
-    '''
-    Scan for an existing connection (set) to a named actor
-    and return any channels from `Actor._peers`.
-
-    This is an optimization method over querying the registrar for
-    the same info.
-
-    '''
-    actor: Actor = current_actor()
-    to_scan: dict[tuple, list[Channel]] = actor._peers.copy()
-    pchan: Channel|None = actor._parent_chan
-    if pchan:
-        to_scan[pchan.uid].append(pchan)
-
-    for aid, chans in to_scan.items():
-        _, peer_name = aid
-        if name == peer_name:
-            if not chans:
-                log.warning(
-                    'No IPC chans for matching peer {peer_name}\n'
-                )
-                continue
-            return chans
-
-    return None
+    async with _connect_chan(host, port) as chan:
+        async with open_portal(chan, **kwargs) as portal:
+            yield portal
 
 
 @acm
 async def query_actor(
     name: str,
-    regaddr: tuple[str, int]|None = None,
+    arbiter_sockaddr: Optional[tuple[str, int]] = None,
 
-) -> AsyncGenerator[
-    tuple[str, int]|None,
-    None,
-]:
+) -> AsyncGenerator[tuple[str, int], None]:
     '''
-    Lookup a transport address (by actor name) via querying a registrar
-    listening @ `regaddr`.
+    Simple address lookup for a given actor name.
 
-    Returns the transport protocol (socket) address or `None` if no
-    entry under that name exists.
+    Returns the (socket) address or ``None``.
 
     '''
-    actor: Actor = current_actor()
-    if (
-        name == 'registrar'
-        and actor.is_registrar
-    ):
-        raise RuntimeError(
-            'The current actor IS the registry!?'
-        )
+    actor = current_actor()
+    async with get_arbiter(
+        *arbiter_sockaddr or actor._arb_addr
+    ) as arb_portal:
 
-    maybe_peers: list[Channel]|None = get_peer_by_name(name)
-    if maybe_peers:
-        yield maybe_peers[0].raddr
-        return
-
-    reg_portal: Portal
-    regaddr: tuple[str, int] = regaddr or actor.reg_addrs[0]
-    async with get_registry(*regaddr) as reg_portal:
-        # TODO: return portals to all available actors - for now
-        # just the last one that registered
-        sockaddr: tuple[str, int] = await reg_portal.run_from_ns(
+        sockaddr = await arb_portal.run_from_ns(
             'self',
             'find_actor',
             name=name,
         )
-        yield sockaddr
 
+        # TODO: return portals to all available actors - for now just
+        # the last one that registered
+        if name == 'arbiter' and actor.is_arbiter:
+            raise RuntimeError("The current actor is the arbiter")
 
-@acm
-async def maybe_open_portal(
-    addr: tuple[str, int],
-    name: str,
-):
-    async with query_actor(
-        name=name,
-        regaddr=addr,
-    ) as sockaddr:
-        pass
-
-    if sockaddr:
-        async with _connect_chan(*sockaddr) as chan:
-            async with open_portal(chan) as portal:
-                yield portal
-    else:
-        yield None
+        yield sockaddr if sockaddr else None
 
 
 @acm
 async def find_actor(
     name: str,
-    registry_addrs: list[tuple[str, int]]|None = None,
+    arbiter_sockaddr: tuple[str, int] | None = None
 
-    only_first: bool = True,
-    raise_on_none: bool = False,
-
-) -> AsyncGenerator[
-    Portal | list[Portal] | None,
-    None,
-]:
+) -> AsyncGenerator[Optional[Portal], None]:
     '''
     Ask the arbiter to find actor(s) by name.
 
@@ -213,102 +118,39 @@ async def find_actor(
     known to the arbiter.
 
     '''
-    # optimization path, use any pre-existing peer channel
-    maybe_peers: list[Channel]|None = get_peer_by_name(name)
-    if maybe_peers and only_first:
-        async with open_portal(maybe_peers[0]) as peer_portal:
-            yield peer_portal
-            return
-
-    if not registry_addrs:
-        # XXX NOTE: make sure to dynamically read the value on
-        # every call since something may change it globally (eg.
-        # like in our discovery test suite)!
-        from . import _root
-        registry_addrs = (
-            _runtime_vars['_registry_addrs']
-            or
-            _root._default_lo_addrs
-        )
-
-    maybe_portals: list[
-        AsyncContextManager[tuple[str, int]]
-    ] = list(
-        maybe_open_portal(
-            addr=addr,
-            name=name,
-        )
-        for addr in registry_addrs
-    )
-    portals: list[Portal]
-    async with gather_contexts(
-        mngrs=maybe_portals,
-    ) as portals:
-        # log.runtime(
-        #     'Gathered portals:\n'
-        #     f'{portals}'
-        # )
-        # NOTE: `gather_contexts()` will return a
-        # `tuple[None, None, ..., None]` if no contact
-        # can be made with any regstrar at any of the
-        # N provided addrs!
-        if not any(portals):
-            if raise_on_none:
-                raise RuntimeError(
-                    f'No actor "{name}" found registered @ {registry_addrs}'
-                )
-            yield None
-            return
-
-        portals: list[Portal] = list(portals)
-        if only_first:
-            yield portals[0]
+    async with query_actor(
+        name=name,
+        arbiter_sockaddr=arbiter_sockaddr,
+    ) as sockaddr:
 
+        if sockaddr:
+            async with _connect_chan(*sockaddr) as chan:
+                async with open_portal(chan) as portal:
+                    yield portal
         else:
-            # TODO: currently this may return multiple portals
-            # given there are multi-homed or multiple registrars..
-            # SO, we probably need de-duplication logic?
-            yield portals
+            yield None
 
 
 @acm
 async def wait_for_actor(
     name: str,
-    registry_addr: tuple[str, int] | None = None,
-
+    arbiter_sockaddr: tuple[str, int] | None = None
 ) -> AsyncGenerator[Portal, None]:
-    '''
-    Wait on at least one peer actor to register `name` with the
-    registrar, yield a `Portal to the first registree.
+    """Wait on an actor to register with the arbiter.
 
-    '''
-    actor: Actor = current_actor()
+    A portal to the first registered actor is returned.
+    """
+    actor = current_actor()
 
-    # optimization path, use any pre-existing peer channel
-    maybe_peers: list[Channel]|None = get_peer_by_name(name)
-    if maybe_peers:
-        async with open_portal(maybe_peers[0]) as peer_portal:
-            yield peer_portal
-            return
-
-    regaddr: tuple[str, int] = (
-        registry_addr
-        or
-        actor.reg_addrs[0]
-    )
-    # TODO: use `.trionics.gather_contexts()` like
-    # above in `find_actor()` as well?
-    reg_portal: Portal
-    async with get_registry(*regaddr) as reg_portal:
-        sockaddrs = await reg_portal.run_from_ns(
+    async with get_arbiter(
+        *arbiter_sockaddr or actor._arb_addr,
+    ) as arb_portal:
+        sockaddrs = await arb_portal.run_from_ns(
             'self',
             'wait_for_actor',
             name=name,
         )
-
-        # get latest registered addr by default?
-        # TODO: offer multi-portal yields in multi-homed case?
-        sockaddr: tuple[str, int] = sockaddrs[-1]
+        sockaddr = sockaddrs[-1]
 
         async with _connect_chan(*sockaddr) as chan:
             async with open_portal(chan) as portal:

tractor/_entry.py

@@ -20,9 +20,6 @@ Sub-process entry points.
 """
 from __future__ import annotations
 from functools import partial
-import multiprocessing as mp
-import os
-import textwrap
 from typing import (
     Any,
     TYPE_CHECKING,
@@ -35,7 +32,6 @@ from .log import (
     get_logger,
 )
 from . import _state
-from .devx import _debug
 from .to_asyncio import run_as_asyncio_guest
 from ._runtime import (
     async_main,
@@ -51,8 +47,8 @@ log = get_logger(__name__)
 
 def _mp_main(
 
-    actor: Actor,
-    accept_addrs: list[tuple[str, int]],
+    actor: Actor,  # type: ignore
+    accept_addr: tuple[str, int],
     forkserver_info: tuple[Any, Any, Any, Any, Any],
     start_method: SpawnMethodKey,
     parent_addr: tuple[str, int] | None = None,
@@ -60,31 +56,29 @@ def _mp_main(
 
 ) -> None:
     '''
-    The routine called *after fork* which invokes a fresh `trio.run()`
+    The routine called *after fork* which invokes a fresh ``trio.run``
 
     '''
     actor._forkserver_info = forkserver_info
     from ._spawn import try_set_start_method
-    spawn_ctx: mp.context.BaseContext = try_set_start_method(start_method)
-    assert spawn_ctx
+    spawn_ctx = try_set_start_method(start_method)
 
     if actor.loglevel is not None:
         log.info(
-            f'Setting loglevel for {actor.uid} to {actor.loglevel}'
-        )
+            f"Setting loglevel for {actor.uid} to {actor.loglevel}")
         get_console_log(actor.loglevel)
 
-    # TODO: use scops headers like for `trio` below!
-    # (well after we libify it maybe..)
+    assert spawn_ctx
     log.info(
-        f'Started new {spawn_ctx.current_process()} for {actor.uid}'
-    #     f"parent_addr is {parent_addr}"
-    )
-    _state._current_actor: Actor = actor
+        f"Started new {spawn_ctx.current_process()} for {actor.uid}")
+
+    _state._current_actor = actor
+
+    log.debug(f"parent_addr is {parent_addr}")
     trio_main = partial(
         async_main,
-        actor=actor,
-        accept_addrs=accept_addrs,
+        actor,
+        accept_addr,
         parent_addr=parent_addr
     )
     try:
@@ -97,114 +91,12 @@ def _mp_main(
         pass  # handle it the same way trio does?
 
     finally:
-        log.info(
-            f'`mp`-subactor {actor.uid} exited'
-        )
-
-
-# TODO: move this func to some kinda `.devx._conc_lang.py` eventually
-# as we work out our multi-domain state-flow-syntax!
-def nest_from_op(
-    input_op: str,
-    #
-    # ?TODO? an idea for a syntax to the state of concurrent systems
-    # as a "3-domain" (execution, scope, storage) model and using
-    # a minimal ascii/utf-8 operator-set.
-    #
-    # try not to take any of this seriously yet XD
-    #
-    # > is a "play operator" indicating (CPU bound)
-    #   exec/work/ops required at the "lowest level computing"
-    #
-    # execution primititves (tasks, threads, actors..) denote their
-    # lifetime with '(' and ')' since parentheses normally are used
-    # in many langs to denote function calls.
-    #
-    # starting = (
-    # >(  opening/starting; beginning of the thread-of-exec (toe?)
-    # (>  opened/started,  (finished spawning toe)
-    # |_<Task: blah blah..>  repr of toe, in py these look like <objs>
-    #
-    # >) closing/exiting/stopping,
-    # )> closed/exited/stopped,
-    # |_<Task: blah blah..>
-    #   [OR <), )< ?? ]
-    #
-    # ending = )
-    # >c) cancelling to close/exit
-    # c)> cancelled (caused close), OR?
-    #  |_<Actor: ..>
-    #   OR maybe "<c)" which better indicates the cancel being
-    #   "delivered/returned" / returned" to LHS?
-    #
-    # >x)  erroring to eventuall exit
-    # x)>  errored and terminated
-    #  |_<Actor: ...>
-    #
-    # scopes: supers/nurseries, IPC-ctxs, sessions, perms, etc.
-    # >{  opening
-    # {>  opened
-    # }>  closed
-    # >}  closing
-    #
-    # storage: like queues, shm-buffers, files, etc..
-    # >[  opening
-    # [>  opened
-    #  |_<FileObj: ..>
-    #
-    # >]  closing
-    # ]>  closed
-
-    # IPC ops: channels, transports, msging
-    # =>  req msg
-    # <=  resp msg
-    # <=> 2-way streaming (of msgs)
-    # <-  recv 1 msg
-    # ->  send 1 msg
-    #
-    # TODO: still not sure on R/L-HS approach..?
-    # =>(  send-req to exec start (task, actor, thread..)
-    # (<=  recv-req to ^
-    #
-    # (<=  recv-req ^
-    # <=(  recv-resp opened remote exec primitive
-    # <=)  recv-resp closed
-    #
-    # )<=c req to stop due to cancel
-    # c=>) req to stop due to cancel
-    #
-    # =>{  recv-req to open
-    # <={  send-status that it closed
-
-    tree_str: str,
-
-    # NOTE: so move back-from-the-left of the `input_op` by
-    # this amount.
-    back_from_op: int = 0,
-) -> str:
-    '''
-    Depth-increment the input (presumably hierarchy/supervision)
-    input "tree string" below the provided `input_op` execution
-    operator, so injecting a `"\n|_{input_op}\n"`and indenting the
-    `tree_str` to nest content aligned with the ops last char.
-
-    '''
-    return (
-        f'{input_op}\n'
-        +
-        textwrap.indent(
-            tree_str,
-            prefix=(
-                len(input_op)
-                -
-                (back_from_op + 1)
-            ) * ' ',
-        )
-    )
+        log.info(f"Actor {actor.uid} terminated")
 
 
 def _trio_main(
-    actor: Actor,
+
+    actor: Actor,  # type: ignore
     *,
     parent_addr: tuple[str, int] | None = None,
     infect_asyncio: bool = False,
@@ -214,73 +106,33 @@ def _trio_main(
     Entry point for a `trio_run_in_process` subactor.
 
     '''
-    _debug.hide_runtime_frames()
+    log.info(f"Started new trio process for {actor.uid}")
+
+    if actor.loglevel is not None:
+        log.info(
+            f"Setting loglevel for {actor.uid} to {actor.loglevel}")
+        get_console_log(actor.loglevel)
+
+    log.info(
+        f"Started {actor.uid}")
 
     _state._current_actor = actor
+
+    log.debug(f"parent_addr is {parent_addr}")
     trio_main = partial(
         async_main,
         actor,
         parent_addr=parent_addr
     )
 
-    if actor.loglevel is not None:
-        get_console_log(actor.loglevel)
-        actor_info: str = (
-            f'|_{actor}\n'
-            f'  uid: {actor.uid}\n'
-            f'  pid: {os.getpid()}\n'
-            f'  parent_addr: {parent_addr}\n'
-            f'  loglevel: {actor.loglevel}\n'
-        )
-        log.info(
-            'Starting new `trio` subactor:\n'
-            +
-            nest_from_op(
-                input_op='>(',  # see syntax ideas above
-                tree_str=actor_info,
-                back_from_op=1,
-            )
-        )
-    logmeth = log.info
-    exit_status: str = (
-        'Subactor exited\n'
-        +
-        nest_from_op(
-            input_op=')>',  # like a "closed-to-play"-icon from super perspective
-            tree_str=actor_info,
-            back_from_op=1,
-        )
-    )
     try:
         if infect_asyncio:
             actor._infected_aio = True
             run_as_asyncio_guest(trio_main)
         else:
             trio.run(trio_main)
-
     except KeyboardInterrupt:
-        logmeth = log.cancel
-        exit_status: str = (
-            'Actor received KBI (aka an OS-cancel)\n'
-            +
-            nest_from_op(
-                input_op='c)>',  # closed due to cancel (see above)
-                tree_str=actor_info,
-            )
-        )
-    except BaseException as err:
-        logmeth = log.error
-        exit_status: str = (
-            'Main actor task exited due to crash?\n'
-            +
-            nest_from_op(
-                input_op='x)>',  # closed by error
-                tree_str=actor_info,
-            )
-        )
-        # NOTE since we raise a tb will already be shown on the
-        # console, thus we do NOT use `.exception()` above.
-        raise err
+        log.warning(f"Actor {actor.uid} received KBI")
 
     finally:
-        logmeth(exit_status)
+        log.info(f"Actor {actor.uid} terminated")

tractor/_ipc.py

@@ -19,64 +19,38 @@ Inter-process comms abstractions
 
 """
 from __future__ import annotations
+import platform
+import struct
+import typing
 from collections.abc import (
     AsyncGenerator,
     AsyncIterator,
 )
-from contextlib import (
-    asynccontextmanager as acm,
-    contextmanager as cm,
-)
-import platform
-from pprint import pformat
-import struct
-import typing
 from typing import (
     Any,
-    Callable,
     runtime_checkable,
+    Optional,
     Protocol,
     Type,
     TypeVar,
 )
 
-import msgspec
 from tricycle import BufferedReceiveStream
+import msgspec
 import trio
+from async_generator import asynccontextmanager
 
-from tractor.log import get_logger
-from tractor._exceptions import (
-    MsgTypeError,
-    pack_from_raise,
-    TransportClosed,
-    _mk_send_mte,
-    _mk_recv_mte,
-)
-from tractor.msg import (
-    _ctxvar_MsgCodec,
-    # _codec,  XXX see `self._codec` sanity/debug checks
-    MsgCodec,
-    types as msgtypes,
-    pretty_struct,
-)
-
+from .log import get_logger
+from ._exceptions import TransportClosed
 log = get_logger(__name__)
 
+
 _is_windows = platform.system() == 'Windows'
+log = get_logger(__name__)
 
 
-def get_stream_addrs(
-    stream: trio.SocketStream
-) -> tuple[
-    tuple[str, int],  # local
-    tuple[str, int],  # remote
-]:
-    '''
-    Return the `trio` streaming transport prot's socket-addrs for
-    both the local and remote sides as a pair.
-
-    '''
-    # rn, should both be IP sockets
+def get_stream_addrs(stream: trio.SocketStream) -> tuple:
+    # should both be IP sockets
     lsockname = stream.socket.getsockname()
     rsockname = stream.socket.getpeername()
     return (
@@ -85,22 +59,16 @@ def get_stream_addrs(
     )
 
 
-# from tractor.msg.types import MsgType
-# ?TODO? this should be our `Union[*msgtypes.__spec__]` alias now right..?
-# => BLEH, except can't bc prots must inherit typevar or param-spec
-#   vars..
-MsgType = TypeVar('MsgType')
+MsgType = TypeVar("MsgType")
+
+# TODO: consider using a generic def and indexing with our eventual
+# msg definition/types?
+# - https://docs.python.org/3/library/typing.html#typing.Protocol
+# - https://jcristharif.com/msgspec/usage.html#structs
 
 
-# TODO: break up this mod into a subpkg so we can start adding new
-# backends and move this type stuff into a dedicated file.. Bo
-#
 @runtime_checkable
 class MsgTransport(Protocol[MsgType]):
-#
-# ^-TODO-^ consider using a generic def and indexing with our
-# eventual msg definition/types?
-# - https://docs.python.org/3/library/typing.html#typing.Protocol
 
     stream: trio.SocketStream
     drained: list[MsgType]
@@ -135,37 +103,20 @@ class MsgTransport(Protocol[MsgType]):
         ...
 
 
-# TODO: typing oddity.. not sure why we have to inherit here, but it
-# seems to be an issue with `get_msg_transport()` returning
-# a `Type[Protocol]`; probably should make a `mypy` issue?
+# TODO: not sure why we have to inherit here, but it seems to be an
+# issue with ``get_msg_transport()`` returning a ``Type[Protocol]``;
+# probably should make a `mypy` issue?
 class MsgpackTCPStream(MsgTransport):
     '''
     A ``trio.SocketStream`` delivering ``msgpack`` formatted data
     using the ``msgspec`` codec lib.
 
     '''
-    layer_key: int = 4
-    name_key: str = 'tcp'
-
-    # TODO: better naming for this?
-    # -[ ] check how libp2p does naming for such things?
-    codec_key: str = 'msgpack'
-
     def __init__(
         self,
         stream: trio.SocketStream,
         prefix_size: int = 4,
 
-        # XXX optionally provided codec pair for `msgspec`:
-        # https://jcristharif.com/msgspec/extending.html#mapping-to-from-native-types
-        #
-        # TODO: define this as a `Codec` struct which can be
-        # overriden dynamically by the application/runtime?
-        codec: tuple[
-            Callable[[Any], Any]|None,  # coder
-            Callable[[type, Any], Any]|None,  # decoder
-        ]|None = None,
-
     ) -> None:
 
         self.stream = stream
@@ -175,44 +126,30 @@ class MsgpackTCPStream(MsgTransport):
         self._laddr, self._raddr = get_stream_addrs(stream)
 
         # create read loop instance
-        self._aiter_pkts = self._iter_packets()
+        self._agen = self._iter_packets()
         self._send_lock = trio.StrictFIFOLock()
 
         # public i guess?
         self.drained: list[dict] = []
 
-        self.recv_stream = BufferedReceiveStream(
-            transport_stream=stream
-        )
+        self.recv_stream = BufferedReceiveStream(transport_stream=stream)
         self.prefix_size = prefix_size
 
-        # allow for custom IPC msg interchange format
-        # dynamic override Bo
-        self._task = trio.lowlevel.current_task()
-
-        # XXX for ctxvar debug only!
-        # self._codec: MsgCodec = (
-        #     codec
-        #     or
-        #     _codec._ctxvar_MsgCodec.get()
-        # )
+        # TODO: struct aware messaging coders
+        self.encode = msgspec.msgpack.Encoder().encode
+        self.decode = msgspec.msgpack.Decoder().decode  # dict[str, Any])
 
     async def _iter_packets(self) -> AsyncGenerator[dict, None]:
-        '''
-        Yield `bytes`-blob decoded packets from the underlying TCP
-        stream using the current task's `MsgCodec`.
-
-        This is a streaming routine implemented as an async generator
-        func (which was the original design, but could be changed?)
-        and is allocated by a `.__call__()` inside `.__init__()` where
-        it is assigned to the `._aiter_pkts` attr.
+        '''Yield packets from the underlying stream.
 
         '''
+        import msgspec  # noqa
         decodes_failed: int = 0
 
         while True:
             try:
-                header: bytes = await self.recv_stream.receive_exactly(4)
+                header = await self.recv_stream.receive_exactly(4)
+
             except (
                 ValueError,
                 ConnectionResetError,
@@ -221,122 +158,25 @@ class MsgpackTCPStream(MsgTransport):
                 # seem to be getting racy failures here on
                 # arbiter/registry name subs..
                 trio.BrokenResourceError,
-
-            ) as trans_err:
-
-                loglevel = 'transport'
-                match trans_err:
-                    # case (
-                    #     ConnectionResetError()
-                    # ):
-                    #     loglevel = 'transport'
-
-                    # peer actor (graceful??) TCP EOF but `tricycle`
-                    # seems to raise a 0-bytes-read?
-                    case ValueError() if (
-                        'unclean EOF' in trans_err.args[0]
-                    ):
-                        pass
-
-                    # peer actor (task) prolly shutdown quickly due
-                    # to cancellation
-                    case trio.BrokenResourceError() if (
-                        'Connection reset by peer' in trans_err.args[0]
-                    ):
-                        pass
-
-                    # unless the disconnect condition falls under "a
-                    # normal operation breakage" we usualy console warn
-                    # about it.
-                    case _:
-                        loglevel: str = 'warning'
-
-
+            ):
                 raise TransportClosed(
-                    message=(
-                        f'IPC transport already closed by peer\n'
-                        f'x)> {type(trans_err)}\n'
-                        f' |_{self}\n'
-                    ),
-                    loglevel=loglevel,
-                ) from trans_err
-
-            # XXX definitely can happen if transport is closed
-            # manually by another `trio.lowlevel.Task` in the
-            # same actor; we use this in some simulated fault
-            # testing for ex, but generally should never happen
-            # under normal operation!
-            #
-            # NOTE: as such we always re-raise this error from the
-            #       RPC msg loop!
-            except trio.ClosedResourceError as closure_err:
-                raise TransportClosed(
-                    message=(
-                        f'IPC transport already manually closed locally?\n'
-                        f'x)> {type(closure_err)} \n'
-                        f' |_{self}\n'
-                    ),
-                    loglevel='error',
-                    raise_on_report=(
-                        closure_err.args[0] == 'another task closed this fd'
-                        or
-                        closure_err.args[0] in ['another task closed this fd']
-                    ),
-                ) from closure_err
-
-            # graceful TCP EOF disconnect
-            if header == b'':
-                raise TransportClosed(
-                    message=(
-                        f'IPC transport already gracefully closed\n'
-                        f')>\n'
-                        f'|_{self}\n'
-                    ),
-                    loglevel='transport',
-                    # cause=???  # handy or no?
+                    f'transport {self} was already closed prior ro read'
+                )
+
+            if header == b'':
+                raise TransportClosed(
+                    f'transport {self} was already closed prior ro read'
                 )
 
-            size: int
             size, = struct.unpack("<I", header)
 
             log.transport(f'received header {size}')  # type: ignore
-            msg_bytes: bytes = await self.recv_stream.receive_exactly(size)
+
+            msg_bytes = await self.recv_stream.receive_exactly(size)
 
             log.transport(f"received {msg_bytes}")  # type: ignore
             try:
-                # NOTE: lookup the `trio.Task.context`'s var for
-                # the current `MsgCodec`.
-                codec: MsgCodec = _ctxvar_MsgCodec.get()
-
-                # XXX for ctxvar debug only!
-                # if self._codec.pld_spec != codec.pld_spec:
-                #     assert (
-                #         task := trio.lowlevel.current_task()
-                #     ) is not self._task
-                #     self._task = task
-                #     self._codec = codec
-                #     log.runtime(
-                #         f'Using new codec in {self}.recv()\n'
-                #         f'codec: {self._codec}\n\n'
-                #         f'msg_bytes: {msg_bytes}\n'
-                #     )
-                yield codec.decode(msg_bytes)
-
-            # XXX NOTE: since the below error derives from
-            # `DecodeError` we need to catch is specially
-            # and always raise such that spec violations
-            # are never allowed to be caught silently!
-            except msgspec.ValidationError as verr:
-                msgtyperr: MsgTypeError = _mk_recv_mte(
-                    msg=msg_bytes,
-                    codec=codec,
-                    src_validation_error=verr,
-                )
-                # XXX deliver up to `Channel.recv()` where
-                # a re-raise and `Error`-pack can inject the far
-                # end actor `.uid`.
-                yield msgtyperr
-
+                yield self.decode(msg_bytes)
             except (
                 msgspec.DecodeError,
                 UnicodeDecodeError,
@@ -346,95 +186,29 @@ class MsgpackTCPStream(MsgTransport):
                     # do with a channel drop - hope that receiving from the
                     # channel will raise an expected error and bubble up.
                     try:
-                        msg_str: str|bytes = msg_bytes.decode()
+                        msg_str: str | bytes = msg_bytes.decode()
                     except UnicodeDecodeError:
                         msg_str = msg_bytes
 
-                    log.exception(
-                        'Failed to decode msg?\n'
-                        f'{codec}\n\n'
-                        'Rxed bytes from wire:\n\n'
-                        f'{msg_str!r}\n'
+                    log.error(
+                        '`msgspec` failed to decode!?\n'
+                        'dumping bytes:\n'
+                        f'{msg_str!r}'
                     )
                     decodes_failed += 1
                 else:
                     raise
 
-    async def send(
-        self,
-        msg: msgtypes.MsgType,
-
-        strict_types: bool = True,
-        hide_tb: bool = False,
-
-    ) -> None:
-        '''
-        Send a msgpack encoded py-object-blob-as-msg over TCP.
-
-        If `strict_types == True` then a `MsgTypeError` will be raised on any
-        invalid msg type
-
-        '''
-        __tracebackhide__: bool = hide_tb
-
-        # XXX see `trio._sync.AsyncContextManagerMixin` for details
-        # on the `.acquire()`/`.release()` sequencing..
+    async def send(self, msg: Any) -> None:
         async with self._send_lock:
 
-            # NOTE: lookup the `trio.Task.context`'s var for
-            # the current `MsgCodec`.
-            codec: MsgCodec = _ctxvar_MsgCodec.get()
-
-            # XXX for ctxvar debug only!
-            # if self._codec.pld_spec != codec.pld_spec:
-            #     self._codec = codec
-            #     log.runtime(
-            #         f'Using new codec in {self}.send()\n'
-            #         f'codec: {self._codec}\n\n'
-            #         f'msg: {msg}\n'
-            #     )
-
-            if type(msg) not in msgtypes.__msg_types__:
-                if strict_types:
-                    raise _mk_send_mte(
-                        msg,
-                        codec=codec,
-                    )
-                else:
-                    log.warning(
-                        'Sending non-`Msg`-spec msg?\n\n'
-                        f'{msg}\n'
-                    )
-
-            try:
-                bytes_data: bytes = codec.encode(msg)
-            except TypeError as _err:
-                typerr = _err
-                msgtyperr: MsgTypeError = _mk_send_mte(
-                    msg,
-                    codec=codec,
-                    message=(
-                        f'IPC-msg-spec violation in\n\n'
-                        f'{pretty_struct.Struct.pformat(msg)}'
-                    ),
-                    src_type_error=typerr,
-                )
-                raise msgtyperr from typerr
+            bytes_data: bytes = self.encode(msg)
 
             # supposedly the fastest says,
             # https://stackoverflow.com/a/54027962
             size: bytes = struct.pack("<I", len(bytes_data))
-            return await self.stream.send_all(size + bytes_data)
 
-        # ?TODO? does it help ever to dynamically show this
-        # frame?
-        # try:
-        #     <the-above_code>
-        # except BaseException as _err:
-        #     err = _err
-        #     if not isinstance(err, MsgTypeError):
-        #         __tracebackhide__: bool = False
-        #     raise
+            return await self.stream.send_all(size + bytes_data)
 
     @property
     def laddr(self) -> tuple[str, int]:
@@ -445,7 +219,7 @@ class MsgpackTCPStream(MsgTransport):
         return self._raddr
 
     async def recv(self) -> Any:
-        return await self._aiter_pkts.asend(None)
+        return await self._agen.asend(None)
 
     async def drain(self) -> AsyncIterator[dict]:
         '''
@@ -462,7 +236,7 @@ class MsgpackTCPStream(MsgTransport):
                 yield msg
 
     def __aiter__(self):
-        return self._aiter_pkts
+        return self._agen
 
     def connected(self) -> bool:
         return self.stream.socket.fileno() != -1
@@ -493,7 +267,7 @@ class Channel:
     def __init__(
 
         self,
-        destaddr: tuple[str, int]|None,
+        destaddr: Optional[tuple[str, int]],
 
         msg_transport_type_key: tuple[str, str] = ('msgpack', 'tcp'),
 
@@ -511,31 +285,18 @@ class Channel:
 
         # Either created in ``.connect()`` or passed in by
         # user in ``.from_stream()``.
-        self._stream: trio.SocketStream|None = None
-        self._transport: MsgTransport|None = None
+        self._stream: Optional[trio.SocketStream] = None
+        self.msgstream: Optional[MsgTransport] = None
 
         # set after handshake - always uid of far end
-        self.uid: tuple[str, str]|None = None
+        self.uid: Optional[tuple[str, str]] = None
 
-        self._aiter_msgs = self._iter_msgs()
-        self._exc: Exception|None = None  # set if far end actor errors
+        self._agen = self._aiter_recv()
+        self._exc: Optional[Exception] = None  # set if far end actor errors
         self._closed: bool = False
-
-        # flag set by ``Portal.cancel_actor()`` indicating remote
-        # (possibly peer) cancellation of the far end actor
-        # runtime.
-        self._cancel_called: bool = False
-
-    @property
-    def msgstream(self) -> MsgTransport:
-        log.info(
-            '`Channel.msgstream` is an old name, use `._transport`'
-        )
-        return self._transport
-
-    @property
-    def transport(self) -> MsgTransport:
-        return self._transport
+        # flag set on ``Portal.cancel_actor()`` indicating
+        # remote (peer) cancellation of the far end actor runtime.
+        self._cancel_called: bool = False  # set on ``Portal.cancel_actor()``
 
     @classmethod
     def from_stream(
@@ -546,78 +307,37 @@ class Channel:
     ) -> Channel:
 
         src, dst = get_stream_addrs(stream)
-        chan = Channel(
-            destaddr=dst,
-            **kwargs,
-        )
+        chan = Channel(destaddr=dst, **kwargs)
 
         # set immediately here from provided instance
-        chan._stream: trio.SocketStream = stream
+        chan._stream = stream
         chan.set_msg_transport(stream)
         return chan
 
     def set_msg_transport(
         self,
         stream: trio.SocketStream,
-        type_key: tuple[str, str]|None = None,
-
-        # XXX optionally provided codec pair for `msgspec`:
-        # https://jcristharif.com/msgspec/extending.html#mapping-to-from-native-types
-        codec: MsgCodec|None = None,
+        type_key: Optional[tuple[str, str]] = None,
 
     ) -> MsgTransport:
-        type_key = (
-            type_key
-            or
-            self._transport_key
-        )
-        # get transport type, then
-        self._transport = get_msg_transport(
-            type_key
-        # instantiate an instance of the msg-transport
-        )(
-            stream,
-            codec=codec,
-        )
-        return self._transport
+        type_key = type_key or self._transport_key
+        self.msgstream = get_msg_transport(type_key)(stream)
+        return self.msgstream
 
-    @cm
-    def apply_codec(
-        self,
-        codec: MsgCodec,
-
-    ) -> None:
-        '''
-        Temporarily override the underlying IPC msg codec for
-        dynamic enforcement of messaging schema.
-
-        '''
-        orig: MsgCodec = self._transport.codec
-        try:
-            self._transport.codec = codec
-            yield
-        finally:
-            self._transport.codec = orig
-
-    # TODO: do a .src/.dst: str for maddrs?
     def __repr__(self) -> str:
-        if not self._transport:
-            return '<Channel with inactive transport?>'
-
-        return repr(
-            self._transport.stream.socket._sock
-        ).replace(  # type: ignore
-            "socket.socket",
-            "Channel",
-        )
+        if self.msgstream:
+            return repr(
+                self.msgstream.stream.socket._sock).replace(  # type: ignore
+                        "socket.socket", "Channel")
+        return object.__repr__(self)
 
     @property
-    def laddr(self) -> tuple[str, int]|None:
-        return self._transport.laddr if self._transport else None
+    def laddr(self) -> Optional[tuple[str, int]]:
+        return self.msgstream.laddr if self.msgstream else None
 
     @property
-    def raddr(self) -> tuple[str, int]|None:
-        return self._transport.raddr if self._transport else None
+    def raddr(self) -> Optional[tuple[str, int]]:
+        return self.msgstream.raddr if self.msgstream else None
 
     async def connect(
         self,
@@ -636,62 +356,26 @@ class Channel:
             *destaddr,
             **kwargs
         )
-        transport = self.set_msg_transport(stream)
+        msgstream = self.set_msg_transport(stream)
 
         log.transport(
-            f'Opened channel[{type(transport)}]: {self.laddr} -> {self.raddr}'
+            f'Opened channel[{type(msgstream)}]: {self.laddr} -> {self.raddr}'
         )
-        return transport
+        return msgstream
 
-    # TODO: something like,
-    # `pdbp.hideframe_on(errors=[MsgTypeError])`
-    # instead of the `try/except` hack we have rn..
-    # seems like a pretty useful thing to have in general
-    # along with being able to filter certain stack frame(s / sets)
-    # possibly based on the current log-level?
-    async def send(
-        self,
-        payload: Any,
+    async def send(self, item: Any) -> None:
 
-        hide_tb: bool = False,
+        log.transport(f"send `{item}`")  # type: ignore
+        assert self.msgstream
 
-    ) -> None:
-        '''
-        Send a coded msg-blob over the transport.
-
-        '''
-        __tracebackhide__: bool = hide_tb
-        try:
-            log.transport(
-                '=> send IPC msg:\n\n'
-                f'{pformat(payload)}\n'
-            )
-            # assert self._transport  # but why typing?
-            await self._transport.send(
-                payload,
-                hide_tb=hide_tb,
-            )
-        except BaseException as _err:
-            err = _err  # bind for introspection
-            if not isinstance(_err, MsgTypeError):
-                # assert err
-                __tracebackhide__: bool = False
-            else:
-                assert err.cid
-
-            raise
+        await self.msgstream.send(item)
 
     async def recv(self) -> Any:
-        assert self._transport
-        return await self._transport.recv()
+        assert self.msgstream
+        return await self.msgstream.recv()
 
-        # TODO: auto-reconnect features like 0mq/nanomsg?
-        # -[ ] implement it manually with nods to SC prot
-        #      possibly on multiple transport backends?
-        #  -> seems like that might be re-inventing scalability
-        #     prots tho no?
         # try:
-        #     return await self._transport.recv()
+        #     return await self.msgstream.recv()
         # except trio.BrokenResourceError:
         #     if self._autorecon:
         #         await self._reconnect()
@@ -704,8 +388,8 @@ class Channel:
             f'Closing channel to {self.uid} '
             f'{self.laddr} -> {self.raddr}'
         )
-        assert self._transport
-        await self._transport.stream.aclose()
+        assert self.msgstream
+        await self.msgstream.stream.aclose()
         self._closed = True
 
     async def __aenter__(self):
@@ -716,11 +400,8 @@ class Channel:
         await self.aclose(*args)
 
     def __aiter__(self):
-        return self._aiter_msgs
+        return self._agen
 
-    # ?TODO? run any reconnection sequence?
-    # -[ ] prolly should be impl-ed as deco-API?
-    #
     # async def _reconnect(self) -> None:
     #     """Handle connection failures by polling until a reconnect can be
     #     established.
@@ -738,6 +419,7 @@ class Channel:
     #             else:
     #                 log.transport("Stream connection re-established!")
 
+    #                 # TODO: run any reconnection sequence
     #                 # on_recon = self._recon_seq
     #                 # if on_recon:
     #                 #     await on_recon(self)
@@ -751,42 +433,23 @@ class Channel:
     #                     " for re-establishment")
     #             await trio.sleep(1)
 
-    async def _iter_msgs(
+    async def _aiter_recv(
         self
     ) -> AsyncGenerator[Any, None]:
         '''
-        Yield `MsgType` IPC msgs decoded and deliverd from
-        an underlying `MsgTransport` protocol.
-
-        This is a streaming routine alo implemented as an async-gen
-        func (same a `MsgTransport._iter_pkts()`) gets allocated by
-        a `.__call__()` inside `.__init__()` where it is assigned to
-        the `._aiter_msgs` attr.
+        Async iterate items from underlying stream.
 
         '''
-        assert self._transport
+        assert self.msgstream
         while True:
             try:
-                async for msg in self._transport:
-                    match msg:
-                        # NOTE: if transport/interchange delivers
-                        # a type error, we pack it with the far
-                        # end peer `Actor.uid` and relay the
-                        # `Error`-msg upward to the `._rpc` stack
-                        # for normal RAE handling.
-                        case MsgTypeError():
-                            yield pack_from_raise(
-                                local_err=msg,
-                                cid=msg.cid,
-
-                                # XXX we pack it here bc lower
-                                # layers have no notion of an
-                                # actor-id ;)
-                                src_uid=self.uid,
-                            )
-                        case _:
-                            yield msg
-
+                async for item in self.msgstream:
+                    yield item
+                    # sent = yield item
+                    # if sent is not None:
+                    #     # optimization, passing None through all the
+                    #     # time is pointless
+                    #     await self.msgstream.send(sent)
             except trio.BrokenResourceError:
 
                 # if not self._autorecon:
@@ -799,14 +462,12 @@ class Channel:
             #     continue
 
     def connected(self) -> bool:
-        return self._transport.connected() if self._transport else False
+        return self.msgstream.connected() if self.msgstream else False
 
 
-@acm
+@asynccontextmanager
 async def _connect_chan(
-    host: str,
-    port: int
-
+    host: str, port: int
 ) -> typing.AsyncGenerator[Channel, None]:
     '''
     Create and connect a channel with disconnect on context manager
@@ -816,5 +477,4 @@ async def _connect_chan(
     chan = Channel((host, port))
     await chan.connect()
     yield chan
-    with trio.CancelScope(shield=True):
-        await chan.aclose()
+    await chan.aclose()

tractor/_multiaddr.py

@@ -1,151 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-'''
-Multiaddress parser and utils according the spec(s) defined by
-`libp2p` and used in dependent project such as `ipfs`:
-
-- https://docs.libp2p.io/concepts/fundamentals/addressing/
-- https://github.com/libp2p/specs/blob/master/addressing/README.md
-
-'''
-from typing import Iterator
-
-from bidict import bidict
-
-# TODO: see if we can leverage libp2p ecosys projects instead of
-# rolling our own (parser) impls of the above addressing specs:
-# - https://github.com/libp2p/py-libp2p
-# - https://docs.libp2p.io/concepts/nat/circuit-relay/#relay-addresses
-# prots: bidict[int, str] = bidict({
-prots: bidict[int, str] = {
-    'ipv4': 3,
-    'ipv6': 3,
-    'wg': 3,
-
-    'tcp': 4,
-    'udp': 4,
-
-    # TODO: support the next-gen shite Bo
-    # 'quic': 4,
-    # 'ssh': 7,  # via rsyscall bootstrapping
-}
-
-prot_params: dict[str, tuple[str]] = {
-    'ipv4': ('addr',),
-    'ipv6': ('addr',),
-    'wg': ('addr', 'port', 'pubkey'),
-
-    'tcp': ('port',),
-    'udp': ('port',),
-
-    # 'quic': ('port',),
-    # 'ssh': ('port',),
-}
-
-
-def iter_prot_layers(
-    multiaddr: str,
-) -> Iterator[
-    tuple[
-        int,
-        list[str]
-    ]
-]:
-    '''
-    Unpack a libp2p style "multiaddress" into multiple "segments"
-    for each "layer" of the protocoll stack (in OSI terms).
-
-    '''
-    tokens: list[str] = multiaddr.split('/')
-    root, tokens = tokens[0], tokens[1:]
-    assert not root  # there is a root '/' on LHS
-    itokens = iter(tokens)
-
-    prot: str | None = None
-    params: list[str] = []
-    for token in itokens:
-        # every prot path should start with a known
-        # key-str.
-        if token in prots:
-            if prot is None:
-                prot: str = token
-            else:
-                yield prot, params
-                prot = token
-
-            params = []
-
-        elif token not in prots:
-            params.append(token)
-
-    else:
-        yield prot, params
-
-
-def parse_maddr(
-    multiaddr: str,
-) -> dict[str, str | int | dict]:
-    '''
-    Parse a libp2p style "multiaddress" into its distinct protocol
-    segments where each segment is of the form:
-
-        `../<protocol>/<param0>/<param1>/../<paramN>`
-
-    and is loaded into a (order preserving) `layers: dict[str,
-    dict[str, Any]` which holds each protocol-layer-segment of the
-    original `str` path as a separate entry according to its approx
-    OSI "layer number".
-
-    Any `paramN` in the path must be distinctly defined by a str-token in the
-    (module global) `prot_params` table.
-
-    For eg. for wireguard which requires an address, port number and publickey
-    the protocol params are specified as the entry:
-
-        'wg': ('addr', 'port', 'pubkey'),
-
-    and are thus parsed from a maddr in that order:
-        `'/wg/1.1.1.1/51820/<pubkey>'`
-
-    '''
-    layers: dict[str, str | int | dict] = {}
-    for (
-        prot_key,
-        params,
-    ) in iter_prot_layers(multiaddr):
-
-        layer: int = prots[prot_key]  # OSI layer used for sorting
-        ep: dict[str, int | str] = {'layer': layer}
-        layers[prot_key] = ep
-
-        # TODO; validation and resolving of names:
-        # - each param via a validator provided as part of the
-        #   prot_params def? (also see `"port"` case below..)
-        # - do a resolv step that will check addrs against
-        #   any loaded network.resolv: dict[str, str]
-        rparams: list = list(reversed(params))
-        for key in prot_params[prot_key]:
-            val: str | int = rparams.pop()
-
-            # TODO: UGHH, dunno what we should do for validation
-            # here, put it in the params spec somehow?
-            if key == 'port':
-                val = int(val)
-
-            ep[key] = val
-
-    return layers

tractor/_portal.py

@@ -15,70 +15,73 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 '''
-Memory "portal" contruct.
-
-"Memory portals" are both an API and set of IPC wrapping primitives
-for managing structured concurrency "cancel-scope linked" tasks
-running in disparate virtual memory domains - at least in different
-OS processes, possibly on different (hardware) hosts.
+Memory boundary "Portals": an API for structured
+concurrency linked tasks running in disparate memory domains.
 
 '''
 from __future__ import annotations
-from contextlib import asynccontextmanager as acm
 import importlib
 import inspect
 from typing import (
-    Any,
-    Callable,
-    AsyncGenerator,
-    TYPE_CHECKING,
+    Any, Optional,
+    Callable, AsyncGenerator,
+    Type,
 )
 from functools import partial
 from dataclasses import dataclass
+from pprint import pformat
 import warnings
 
 import trio
+from async_generator import asynccontextmanager
 
 from .trionics import maybe_open_nursery
-from ._state import (
-    current_actor,
-)
+from ._state import current_actor
 from ._ipc import Channel
 from .log import get_logger
-from .msg import (
-    # Error,
-    PayloadMsg,
-    NamespacePath,
-    Return,
-)
+from .msg import NamespacePath
 from ._exceptions import (
-    # unpack_error,
+    unpack_error,
     NoResult,
-)
-from ._context import (
-    Context,
-    open_context_from_portal,
+    ContextCancelled,
 )
 from ._streaming import (
+    Context,
     MsgStream,
 )
 
-if TYPE_CHECKING:
-    from ._runtime import Actor
 
 log = get_logger(__name__)
 
 
+def _unwrap_msg(
+    msg: dict[str, Any],
+    channel: Channel
+
+) -> Any:
+    __tracebackhide__ = True
+    try:
+        return msg['return']
+    except KeyError:
+        # internal error should never get here
+        assert msg.get('cid'), "Received internal error at portal?"
+        raise unpack_error(msg, channel) from None
+
+
+class MessagingError(Exception):
+    'Some kind of unexpected SC messaging dialog issue'
+
+
 class Portal:
     '''
-    A 'portal' to a memory-domain-separated `Actor`.
+    A 'portal' to a(n) (remote) ``Actor``.
 
     A portal is "opened" (and eventually closed) by one side of an
     inter-actor communication context. The side which opens the portal
     is equivalent to a "caller" in function parlance and usually is
     either the called actor's parent (in process tree hierarchy terms)
     or a client interested in scheduling work to be done remotely in a
-    process which has a separate (virtual) memory domain.
+    far process.
 
     The portal api allows the "caller" actor to invoke remote routines
     and receive results through an underlying ``tractor.Channel`` as
@@ -88,45 +91,22 @@ class Portal:
     like having a "portal" between the seperate actor memory spaces.
 
     '''
-    # global timeout for remote cancel requests sent to
-    # connected (peer) actors.
-    cancel_timeout: float = 0.5
+    # the timeout for a remote cancel request sent to
+    # a(n) (peer) actor.
+    cancel_timeout = 0.5
 
-    def __init__(
-        self,
-        channel: Channel,
-    ) -> None:
-
-        self._chan: Channel = channel
+    def __init__(self, channel: Channel) -> None:
+        self.channel = channel
         # during the portal's lifetime
-        self._final_result_pld: Any|None = None
-        self._final_result_msg: PayloadMsg|None = None
+        self._result_msg: Optional[dict] = None
 
         # When set to a ``Context`` (when _submit_for_result is called)
         # it is expected that ``result()`` will be awaited at some
         # point.
-        self._expect_result_ctx: Context|None = None
+        self._expect_result: Optional[Context] = None
         self._streams: set[MsgStream] = set()
-        self.actor: Actor = current_actor()
+        self.actor = current_actor()
 
-    @property
-    def chan(self) -> Channel:
-        return self._chan
-
-    @property
-    def channel(self) -> Channel:
-        '''
-        Proxy to legacy attr name..
-
-        Consider the shorter `Portal.chan` instead of `.channel` ;)
-        '''
-        log.debug(
-            'Consider the shorter `Portal.chan` instead of `.channel` ;)'
-        )
-        return self.chan
-
-    # TODO: factor this out into a `.highlevel` API-wrapper that uses
-    # a single `.open_context()` call underneath.
     async def _submit_for_result(
         self,
         ns: str,
@@ -134,34 +114,32 @@ class Portal:
         **kwargs
     ) -> None:
 
-        if self._expect_result_ctx is not None:
-            raise RuntimeError(
-                'A pending main result has already been submitted'
-            )
+        assert self._expect_result is None, \
+                "A pending main result has already been submitted"
 
-        self._expect_result_ctx: Context = await self.actor.start_remote_task(
+        self._expect_result = await self.actor.start_remote_task(
             self.channel,
-            nsf=NamespacePath(f'{ns}:{func}'),
-            kwargs=kwargs,
-            portal=self,
+            ns,
+            func,
+            kwargs
         )
 
-    # TODO: we should deprecate this API right? since if we remove
-    # `.run_in_actor()` (and instead move it to a `.highlevel`
-    # wrapper api (around a single `.open_context()` call) we don't
-    # really have any notion of a "main" remote task any more?
-    #
-    # @api_frame
-    async def wait_for_result(
+    async def _return_once(
         self,
-        hide_tb: bool = True,
-    ) -> Any:
+        ctx: Context,
+
+    ) -> dict[str, Any]:
+
+        assert ctx._remote_func_type == 'asyncfunc'  # single response
+        msg = await ctx._recv_chan.receive()
+        return msg
+
+    async def result(self) -> Any:
         '''
-        Return the final result delivered by a `Return`-msg from the
-        remote peer actor's "main" task's `return` statement.
+        Return the result(s) from the remote actor's "main" task.
 
         '''
-        __tracebackhide__: bool = hide_tb
+        # __tracebackhide__ = True
         # Check for non-rpc errors slapped on the
         # channel for which we always raise
         exc = self.channel._exc
@@ -169,7 +147,7 @@ class Portal:
             raise exc
 
         # not expecting a "main" result
-        if self._expect_result_ctx is None:
+        if self._expect_result is None:
             log.warning(
                 f"Portal for {self.channel.uid} not expecting a final"
                 " result?\nresult() should only be called if subactor"
@@ -177,41 +155,14 @@ class Portal:
             return NoResult
 
         # expecting a "main" result
-        assert self._expect_result_ctx
+        assert self._expect_result
 
-        if self._final_result_msg is None:
-            try:
-                (
-                    self._final_result_msg,
-                    self._final_result_pld,
-                ) = await self._expect_result_ctx._pld_rx.recv_msg_w_pld(
-                    ipc=self._expect_result_ctx,
-                    expect_msg=Return,
-                )
-            except BaseException as err:
-                # TODO: wrap this into `@api_frame` optionally with
-                # some kinda filtering mechanism like log levels?
-                __tracebackhide__: bool = False
-                raise err
+        if self._result_msg is None:
+            self._result_msg = await self._return_once(
+                self._expect_result
+            )
 
-        return self._final_result_pld
-
-    # TODO: factor this out into a `.highlevel` API-wrapper that uses
-    # a single `.open_context()` call underneath.
-    async def result(
-        self,
-        *args,
-        **kwargs,
-    ) -> Any|Exception:
-        typname: str = type(self).__name__
-        log.warning(
-            f'`{typname}.result()` is DEPRECATED!\n'
-            f'Use `{typname}.wait_for_result()` instead!\n'
-        )
-        return await self.wait_for_result(
-            *args,
-            **kwargs,
-        )
+        return _unwrap_msg(self._result_msg, self.channel)
 
     async def _cancel_streams(self):
         # terminate all locally running async generator
@@ -242,60 +193,30 @@ class Portal:
 
     ) -> bool:
         '''
-        Cancel the actor runtime (and thus process) on the far
-        end of this portal.
-
-        **NOTE** THIS CANCELS THE ENTIRE RUNTIME AND THE
-        SUBPROCESS, it DOES NOT just cancel the remote task. If you
-        want to have a handle to cancel a remote ``tri.Task`` look
-        at `.open_context()` and the definition of
-        `._context.Context.cancel()` which CAN be used for this
-        purpose.
+        Cancel the actor on the other end of this portal.
 
         '''
-        __runtimeframe__: int = 1  # noqa
-
-        chan: Channel = self.channel
-        if not chan.connected():
-            log.runtime(
-                'This channel is already closed, skipping cancel request..'
-            )
+        if not self.channel.connected():
+            log.cancel("This channel is already closed can't cancel")
             return False
 
-        reminfo: str = (
-            f'c)=> {self.channel.uid}\n'
-            f'  |_{chan}\n'
-        )
         log.cancel(
-            f'Requesting actor-runtime cancel for peer\n\n'
-            f'{reminfo}'
-        )
+            f"Sending actor cancel request to {self.channel.uid} on "
+            f"{self.channel}")
+
+        self.channel._cancel_called = True
 
-        # XXX the one spot we set it?
-        self.channel._cancel_called: bool = True
         try:
             # send cancel cmd - might not get response
-            # XXX: sure would be nice to make this work with
-            # a proper shield
-            with trio.move_on_after(
-                timeout
-                or
-                self.cancel_timeout
-            ) as cs:
-                cs.shield: bool = True
-                await self.run_from_ns(
-                    'self',
-                    'cancel',
-                )
+            # XXX: sure would be nice to make this work with a proper shield
+            with trio.move_on_after(timeout or self.cancel_timeout) as cs:
+                cs.shield = True
+
+                await self.run_from_ns('self', 'cancel')
                 return True
 
             if cs.cancelled_caught:
-                # may timeout and we never get an ack (obvi racy)
-                # but that doesn't mean it wasn't cancelled.
-                log.debug(
-                    'May have failed to cancel peer?\n'
-                    f'{reminfo}'
-                )
+                log.cancel(f"May have failed to cancel {self.channel.uid}")
 
             # if we get here some weird cancellation case happened
             return False
@@ -304,15 +225,11 @@ class Portal:
             trio.ClosedResourceError,
             trio.BrokenResourceError,
         ):
-            log.debug(
-                'IPC chan for actor already closed or broken?\n\n'
-                f'{self.channel.uid}\n'
-                f' |_{self.channel}\n'
-            )
+            log.cancel(
+                f"{self.channel} for {self.channel.uid} was already "
+                "closed or broken?")
             return False
 
-    # TODO: do we still need this for low level `Actor`-runtime
-    # method calls or can we also remove it?
     async def run_from_ns(
         self,
         namespace_path: str,
@@ -329,35 +246,27 @@ class Portal:
 
         Note::
 
-          A special namespace `self` can be used to invoke `Actor`
-          instance methods in the remote runtime. Currently this
-          should only ever be used for `Actor` (method) runtime
-          internals!
+            A special namespace `self` can be used to invoke `Actor`
+            instance methods in the remote runtime. Currently this
+            should only be used solely for ``tractor`` runtime
+            internals.
 
         '''
-        __runtimeframe__: int = 1  # noqa
-        nsf = NamespacePath(
-            f'{namespace_path}:{function_name}'
-        )
-        ctx: Context = await self.actor.start_remote_task(
-            chan=self.channel,
-            nsf=nsf,
-            kwargs=kwargs,
-            portal=self,
-        )
-        return await ctx._pld_rx.recv_pld(
-            ipc=ctx,
-            expect_msg=Return,
+        ctx = await self.actor.start_remote_task(
+            self.channel,
+            namespace_path,
+            function_name,
+            kwargs,
         )
+        ctx._portal = self
+        msg = await self._return_once(ctx)
+        return _unwrap_msg(msg, self.channel)
 
-    # TODO: factor this out into a `.highlevel` API-wrapper that uses
-    # a single `.open_context()` call underneath.
     async def run(
         self,
         func: str,
-        fn_name: str|None = None,
+        fn_name: Optional[str] = None,
         **kwargs
-
     ) -> Any:
         '''
         Submit a remote function to be scheduled and run by actor, in
@@ -367,8 +276,6 @@ class Portal:
         remote rpc task or a local async generator instance.
 
         '''
-        __runtimeframe__: int = 1  # noqa
-
         if isinstance(func, str):
             warnings.warn(
                 "`Portal.run(namespace: str, funcname: str)` is now"
@@ -378,9 +285,8 @@ class Portal:
                 DeprecationWarning,
                 stacklevel=2,
             )
-            fn_mod_path: str = func
+            fn_mod_path = func
             assert isinstance(fn_name, str)
-            nsf = NamespacePath(f'{fn_mod_path}:{fn_name}')
 
         else:  # function reference was passed directly
             if (
@@ -393,36 +299,27 @@ class Portal:
                 raise TypeError(
                     f'{func} must be a non-streaming async function!')
 
-            nsf = NamespacePath.from_ref(func)
+            fn_mod_path, fn_name = NamespacePath.from_ref(func).to_tuple()
 
         ctx = await self.actor.start_remote_task(
             self.channel,
-            nsf=nsf,
-            kwargs=kwargs,
-            portal=self,
+            fn_mod_path,
+            fn_name,
+            kwargs,
         )
-        return await ctx._pld_rx.recv_pld(
-            ipc=ctx,
-            expect_msg=Return,
+        ctx._portal = self
+        return _unwrap_msg(
+            await self._return_once(ctx),
+            self.channel,
         )
 
-    # TODO: factor this out into a `.highlevel` API-wrapper that uses
-    # a single `.open_context()` call underneath.
-    @acm
+    @asynccontextmanager
     async def open_stream_from(
         self,
         async_gen_func: Callable,  # typing: ignore
         **kwargs,
 
     ) -> AsyncGenerator[MsgStream, None]:
-        '''
-        Legacy one-way streaming API.
-
-        TODO: re-impl on top `Portal.open_context()` + an async gen
-        around `Context.open_stream()`.
-
-        '''
-        __runtimeframe__: int = 1  # noqa
 
         if not inspect.isasyncgenfunction(async_gen_func):
             if not (
@@ -432,12 +329,15 @@ class Portal:
                 raise TypeError(
                     f'{async_gen_func} must be an async generator function!')
 
-        ctx: Context = await self.actor.start_remote_task(
+        fn_mod_path, fn_name = NamespacePath.from_ref(
+            async_gen_func).to_tuple()
+        ctx = await self.actor.start_remote_task(
             self.channel,
-            nsf=NamespacePath.from_ref(async_gen_func),
-            kwargs=kwargs,
-            portal=self,
+            fn_mod_path,
+            fn_name,
+            kwargs
         )
+        ctx._portal = self
 
         # ensure receive-only stream entrypoint
         assert ctx._remote_func_type == 'asyncgen'
@@ -445,14 +345,13 @@ class Portal:
         try:
             # deliver receive only stream
             async with MsgStream(
-                ctx=ctx,
-                rx_chan=ctx._rx_chan,
-            ) as stream:
-                self._streams.add(stream)
-                ctx._stream = stream
-                yield stream
+                ctx, ctx._recv_chan,
+            ) as rchan:
+                self._streams.add(rchan)
+                yield rchan
 
         finally:
+
             # cancel the far end task on consumer close
             # NOTE: this is a special case since we assume that if using
             # this ``.open_fream_from()`` api, the stream is one a one
@@ -471,14 +370,177 @@ class Portal:
 
             # XXX: should this always be done?
             # await recv_chan.aclose()
-            self._streams.remove(stream)
+            self._streams.remove(rchan)
 
-    # NOTE: impl is found in `._context`` mod to make
-    # reading/groking the details simpler code-org-wise. This
-    # method does not have to be used over that `@acm` module func
-    # directly, it is for conventience and from the original API
-    # design.
-    open_context = open_context_from_portal
+    @asynccontextmanager
+    async def open_context(
+
+        self,
+        func: Callable,
+        **kwargs,
+
+    ) -> AsyncGenerator[tuple[Context, Any], None]:
+        '''
+        Open an inter-actor task context.
+
+        This is a synchronous API which allows for deterministic
+        setup/teardown of a remote task. The yielded ``Context`` further
+        allows for opening bidirectional streams, explicit cancellation
+        and synchronized final result collection. See ``tractor.Context``.
+
+        '''
+        # conduct target func method structural checks
+        if not inspect.iscoroutinefunction(func) and (
+            getattr(func, '_tractor_contex_function', False)
+        ):
+            raise TypeError(
+                f'{func} must be an async generator function!')
+
+        fn_mod_path, fn_name = NamespacePath.from_ref(func).to_tuple()
+
+        ctx = await self.actor.start_remote_task(
+            self.channel,
+            fn_mod_path,
+            fn_name,
+            kwargs
+        )
+
+        assert ctx._remote_func_type == 'context'
+        msg = await ctx._recv_chan.receive()
+
+        try:
+            # the "first" value here is delivered by the callee's
+            # ``Context.started()`` call.
+            first = msg['started']
+            ctx._started_called = True
+
+        except KeyError:
+            assert msg.get('cid'), ("Received internal error at context?")
+
+            if msg.get('error'):
+                # raise kerr from unpack_error(msg, self.channel)
+                raise unpack_error(msg, self.channel) from None
+            else:
+                raise MessagingError(
+                    f'Context for {ctx.cid} was expecting a `started` message'
+                    f' but received a non-error msg:\n{pformat(msg)}'
+                )
+
+        _err: Optional[BaseException] = None
+        ctx._portal = self
+
+        uid = self.channel.uid
+        cid = ctx.cid
+        etype: Optional[Type[BaseException]] = None
+
+        # deliver context instance and .started() msg value in open tuple.
+        try:
+            async with trio.open_nursery() as scope_nursery:
+                ctx._scope_nursery = scope_nursery
+
+                # do we need this?
+                # await trio.lowlevel.checkpoint()
+
+                yield ctx, first
+
+        except ContextCancelled as err:
+            _err = err
+            if not ctx._cancel_called:
+                # context was cancelled at the far end but was
+                # not part of this end requesting that cancel
+                # so raise for the local task to respond and handle.
+                raise
+
+            # if the context was cancelled by client code
+            # then we don't need to raise since user code
+            # is expecting this and the block should exit.
+            else:
+                log.debug(f'Context {ctx} cancelled gracefully')
+
+        except (
+            BaseException,
+
+            # more specifically, we need to handle these but not
+            # sure it's worth being pedantic:
+            # Exception,
+            # trio.Cancelled,
+            # KeyboardInterrupt,
+
+        ) as err:
+            etype = type(err)
+            # the context cancels itself on any cancel
+            # causing error.
+
+            if ctx.chan.connected():
+                log.cancel(
+                    'Context cancelled for task, sending cancel request..\n'
+                    f'task:{cid}\n'
+                    f'actor:{uid}'
+                )
+                await ctx.cancel()
+            else:
+                log.warning(
+                    'IPC connection for context is broken?\n'
+                    f'task:{cid}\n'
+                    f'actor:{uid}'
+                )
+
+            raise
+
+        finally:
+            # in the case where a runtime nursery (due to internal bug)
+            # or a remote actor transmits an error we want to be
+            # sure we get the error the underlying feeder mem chan.
+            # if it's not raised here it *should* be raised from the
+            # msg loop nursery right?
+            if ctx.chan.connected():
+                log.info(
+                    'Waiting on final context-task result for\n'
+                    f'task: {cid}\n'
+                    f'actor: {uid}'
+                )
+                result = await ctx.result()
+                log.runtime(
+                    f'Context {fn_name} returned '
+                    f'value from callee `{result}`'
+                )
+
+            # though it should be impossible for any tasks
+            # operating *in* this scope to have survived
+            # we tear down the runtime feeder chan last
+            # to avoid premature stream clobbers.
+            if ctx._recv_chan is not None:
+                # should we encapsulate this in the context api?
+                await ctx._recv_chan.aclose()
+
+            if etype:
+                if ctx._cancel_called:
+                    log.cancel(
+                        f'Context {fn_name} cancelled by caller with\n{etype}'
+                    )
+                elif _err is not None:
+                    log.cancel(
+                        f'Context for task cancelled by callee with {etype}\n'
+                        f'target: `{fn_name}`\n'
+                        f'task:{cid}\n'
+                        f'actor:{uid}'
+                    )
+            # XXX: (MEGA IMPORTANT) if this is a root opened process we
+            # wait for any immediate child in debug before popping the
+            # context from the runtime msg loop otherwise inside
+            # ``Actor._push_result()`` the msg will be discarded and in
+            # the case where that msg is global debugger unlock (via
+            # a "stop" msg for a stream), this can result in a deadlock
+            # where the root is waiting on the lock to clear but the
+            # child has already cleared it and clobbered IPC.
+            from ._debug import maybe_wait_for_debugger
+            await maybe_wait_for_debugger()
+
+            # remove the context from runtime tracking
+            self.actor._contexts.pop(
+                (self.channel.uid, ctx.cid),
+                None,
+            )
 
 
 @dataclass
@@ -493,12 +555,7 @@ class LocalPortal:
     actor: 'Actor'  # type: ignore # noqa
     channel: Channel
 
-    async def run_from_ns(
-        self,
-        ns: str,
-        func_name: str,
-        **kwargs,
-    ) -> Any:
+    async def run_from_ns(self, ns: str, func_name: str, **kwargs) -> Any:
         '''
         Run a requested local function from a namespace path and
         return it's result.
@@ -509,11 +566,11 @@ class LocalPortal:
         return await func(**kwargs)
 
 
-@acm
+@asynccontextmanager
 async def open_portal(
 
     channel: Channel,
-    tn: trio.Nursery|None = None,
+    nursery: Optional[trio.Nursery] = None,
     start_msg_loop: bool = True,
     shield: bool = False,
 
@@ -521,19 +578,15 @@ async def open_portal(
     '''
     Open a ``Portal`` through the provided ``channel``.
 
-    Spawns a background task to handle RPC processing, normally
-    done by the actor-runtime implicitly via a call to
-    `._rpc.process_messages()`. just after connection establishment.
+    Spawns a background task to handle message processing (normally
+    done by the actor-runtime implicitly).
 
     '''
     actor = current_actor()
     assert actor
-    was_connected: bool = False
+    was_connected = False
 
-    async with maybe_open_nursery(
-        tn,
-        shield=shield,
-    ) as tn:
+    async with maybe_open_nursery(nursery, shield=shield) as nursery:
 
         if not channel.connected():
             await channel.connect()
@@ -542,10 +595,10 @@ async def open_portal(
         if channel.uid is None:
             await actor._do_handshake(channel)
 
-        msg_loop_cs: trio.CancelScope|None = None
+        msg_loop_cs: Optional[trio.CancelScope] = None
         if start_msg_loop:
             from ._runtime import process_messages
-            msg_loop_cs = await tn.start(
+            msg_loop_cs = await nursery.start(
                 partial(
                     process_messages,
                     actor,
@@ -562,10 +615,12 @@ async def open_portal(
             await portal.aclose()
 
             if was_connected:
-                await channel.aclose()
+                # gracefully signal remote channel-msg loop
+                await channel.send(None)
+                # await channel.aclose()
 
             # cancel background msg loop task
-            if msg_loop_cs is not None:
+            if msg_loop_cs:
                 msg_loop_cs.cancel()
 
-            tn.cancel_scope.cancel()
+            nursery.cancel_scope.cancel()

tractor/_root.py

@@ -18,28 +18,26 @@
 Root actor runtime ignition(s).
 
 '''
-from contextlib import asynccontextmanager as acm
+from contextlib import asynccontextmanager
 from functools import partial
 import importlib
-import inspect
 import logging
-import os
 import signal
 import sys
-from typing import Callable
+import os
+import typing
 import warnings
 
 
+from exceptiongroup import BaseExceptionGroup
 import trio
 
 from ._runtime import (
     Actor,
     Arbiter,
-    # TODO: rename and make a non-actor subtype?
-    # Arbiter as Registry,
     async_main,
 )
-from .devx import _debug
+from . import _debug
 from . import _spawn
 from . import _state
 from . import log
@@ -48,120 +46,60 @@ from ._exceptions import is_multi_cancelled
 
 
 # set at startup and after forks
-_default_host: str = '127.0.0.1'
-_default_port: int = 1616
-
-# default registry always on localhost
-_default_lo_addrs: list[tuple[str, int]] = [(
-    _default_host,
-    _default_port,
-)]
+_default_arbiter_host: str = '127.0.0.1'
+_default_arbiter_port: int = 1616
 
 
 logger = log.get_logger('tractor')
 
 
-@acm
+@asynccontextmanager
 async def open_root_actor(
 
     *,
     # defaults are above
-    registry_addrs: list[tuple[str, int]]|None = None,
+    arbiter_addr: tuple[str, int] | None = None,
 
     # defaults are above
-    arbiter_addr: tuple[str, int]|None = None,
+    registry_addr: tuple[str, int] | None = None,
 
-    name: str|None = 'root',
+    name: str | None = 'root',
 
     # either the `multiprocessing` start method:
     # https://docs.python.org/3/library/multiprocessing.html#contexts-and-start-methods
     # OR `trio` (the new default).
-    start_method: _spawn.SpawnMethodKey|None = None,
+    start_method: _spawn.SpawnMethodKey | None = None,
 
     # enables the multi-process debugger support
     debug_mode: bool = False,
-    maybe_enable_greenback: bool = True,  # `.pause_from_sync()/breakpoint()` support
-    enable_stack_on_sig: bool = False,
 
     # internal logging
-    loglevel: str|None = None,
+    loglevel: str | None = None,
 
-    enable_modules: list|None = None,
-    rpc_module_paths: list|None = None,
+    enable_modules: list | None = None,
+    rpc_module_paths: list | None = None,
 
-    # NOTE: allow caller to ensure that only one registry exists
-    # and that this call creates it.
-    ensure_registry: bool = False,
-
-    hide_tb: bool = True,
-
-) -> Actor:
+) -> typing.Any:
     '''
     Runtime init entry point for ``tractor``.
 
     '''
-    __tracebackhide__: bool = hide_tb
-    _debug.hide_runtime_frames()
-
-    # TODO: stick this in a `@cm` defined in `devx._debug`?
-    #
     # Override the global debugger hook to make it play nice with
     # ``trio``, see much discussion in:
     # https://github.com/python-trio/trio/issues/1155#issuecomment-742964018
-    builtin_bp_handler: Callable = sys.breakpointhook
-    orig_bp_path: str|None = os.environ.get(
-        'PYTHONBREAKPOINT',
-        None,
-    )
-    if (
-        debug_mode
-        and maybe_enable_greenback
-        and (
-            maybe_mod := await _debug.maybe_init_greenback(
-                raise_not_found=False,
-            )
-        )
-    ):
-        logger.info(
-            f'Found `greenback` installed @ {maybe_mod}\n'
-            'Enabling `tractor.pause_from_sync()` support!\n'
-        )
-        os.environ['PYTHONBREAKPOINT'] = (
-            'tractor.devx._debug._sync_pause_from_builtin'
-        )
-        _state._runtime_vars['use_greenback'] = True
-
-    else:
-        # TODO: disable `breakpoint()` by default (without
-        # `greenback`) since it will break any multi-actor
-        # usage by a clobbered TTY's stdstreams!
-        def block_bps(*args, **kwargs):
-            raise RuntimeError(
-                'Trying to use `breakpoint()` eh?\n\n'
-                'Welp, `tractor` blocks `breakpoint()` built-in calls by default!\n'
-                'If you need to use it please install `greenback` and set '
-                '`debug_mode=True` when opening the runtime '
-                '(either via `.open_nursery()` or `open_root_actor()`)\n'
-            )
-
-        sys.breakpointhook = block_bps
-        # lol ok,
-        # https://docs.python.org/3/library/sys.html#sys.breakpointhook
-        os.environ['PYTHONBREAKPOINT'] = "0"
+    builtin_bp_handler = sys.breakpointhook
+    orig_bp_path: str | None = os.environ.get('PYTHONBREAKPOINT', None)
+    os.environ['PYTHONBREAKPOINT'] = 'tractor._debug._set_trace'
 
     # attempt to retreive ``trio``'s sigint handler and stash it
     # on our debugger lock state.
-    _debug.DebugStatus._trio_handler = signal.getsignal(signal.SIGINT)
+    _debug.Lock._trio_handler = signal.getsignal(signal.SIGINT)
 
     # mark top most level process as root actor
     _state._runtime_vars['_is_root'] = True
 
     # caps based rpc list
-    enable_modules = (
-        enable_modules
-        or
-        []
-    )
+    enable_modules = enable_modules or []
 
     if rpc_module_paths:
         warnings.warn(
@@ -177,34 +115,29 @@ async def open_root_actor(
 
     if arbiter_addr is not None:
         warnings.warn(
-            '`arbiter_addr` is now deprecated\n'
-            'Use `registry_addrs: list[tuple]` instead..',
+            '`arbiter_addr` is now deprecated and has been renamed to'
+            '`registry_addr`.\nUse that instead..',
             DeprecationWarning,
             stacklevel=2,
         )
-        registry_addrs = [arbiter_addr]
 
-    registry_addrs: list[tuple[str, int]] = (
-        registry_addrs
-        or
-        _default_lo_addrs
+    registry_addr = (host, port) = (
+        registry_addr
+        or arbiter_addr
+        or (
+            _default_arbiter_host,
+            _default_arbiter_port,
+        )
     )
-    assert registry_addrs
 
-    loglevel = (
-        loglevel
-        or log._default_loglevel
-    ).upper()
+    loglevel = (loglevel or log._default_loglevel).upper()
 
-    if (
-        debug_mode
-        and _spawn._spawn_method == 'trio'
-    ):
+    if debug_mode and _spawn._spawn_method == 'trio':
         _state._runtime_vars['_debug_mode'] = True
 
-        # expose internal debug module to every actor allowing for
-        # use of ``await tractor.pause()``
-        enable_modules.append('tractor.devx._debug')
+        # expose internal debug module to every actor allowing
+        # for use of ``await tractor.breakpoint()``
+        enable_modules.append('tractor._debug')
 
         # if debug mode get's enabled *at least* use that level of
         # logging for some informative console prompts.
@@ -217,178 +150,97 @@ async def open_root_actor(
         ):
             loglevel = 'PDB'
 
-
     elif debug_mode:
         raise RuntimeError(
             "Debug mode is only supported for the `trio` backend!"
         )
 
-    assert loglevel
-    _log = log.get_console_log(loglevel)
-    assert _log
+    log.get_console_log(loglevel)
 
-    # TODO: factor this into `.devx._stackscope`!!
-    if (
-        debug_mode
-        and
-        enable_stack_on_sig
-    ):
-        from .devx._stackscope import enable_stack_on_sig
-        enable_stack_on_sig()
+    try:
+        # make a temporary connection to see if an arbiter exists,
+        # if one can't be made quickly we assume none exists.
+        arbiter_found = False
 
-    # closed into below ping task-func
-    ponged_addrs: list[tuple[str, int]] = []
+        # TODO: this connect-and-bail forces us to have to carefully
+        # rewrap TCP 104-connection-reset errors as EOF so as to avoid
+        # propagating cancel-causing errors to the channel-msg loop
+        # machinery.  Likely it would be better to eventually have
+        # a "discovery" protocol with basic handshake instead.
+        with trio.move_on_after(1):
+            async with _connect_chan(host, port):
+                arbiter_found = True
 
-    async def ping_tpt_socket(
-        addr: tuple[str, int],
-        timeout: float = 1,
-    ) -> None:
-        '''
-        Attempt temporary connection to see if a registry is
-        listening at the requested address by a tranport layer
-        ping.
+    except OSError:
+        # TODO: make this a "discovery" log level?
+        logger.warning(f"No actor registry found @ {host}:{port}")
 
-        If a connection can't be made quickly we assume none no
-        server is listening at that addr.
-
-        '''
-        try:
-            # TODO: this connect-and-bail forces us to have to
-            # carefully rewrap TCP 104-connection-reset errors as
-            # EOF so as to avoid propagating cancel-causing errors
-            # to the channel-msg loop machinery. Likely it would
-            # be better to eventually have a "discovery" protocol
-            # with basic handshake instead?
-            with trio.move_on_after(timeout):
-                async with _connect_chan(*addr):
-                    ponged_addrs.append(addr)
-
-        except OSError:
-            # TODO: make this a "discovery" log level?
-            logger.info(
-                f'No actor registry found @ {addr}\n'
-            )
-
-    async with trio.open_nursery() as tn:
-        for addr in registry_addrs:
-            tn.start_soon(
-                ping_tpt_socket,
-                tuple(addr),  # TODO: just drop this requirement?
-            )
-
-    trans_bind_addrs: list[tuple[str, int]] = []
-
-    # Create a new local root-actor instance which IS NOT THE
-    # REGISTRAR
-    if ponged_addrs:
-        if ensure_registry:
-            raise RuntimeError(
-                 f'Failed to open `{name}`@{ponged_addrs}: '
-                'registry socket(s) already bound'
-            )
+    # create a local actor and start up its main routine/task
+    if arbiter_found:
 
         # we were able to connect to an arbiter
-        logger.info(
-            f'Registry(s) seem(s) to exist @ {ponged_addrs}'
-        )
+        logger.info(f"Arbiter seems to exist @ {host}:{port}")
 
         actor = Actor(
-            name=name or 'anonymous',
-            registry_addrs=ponged_addrs,
+            name or 'anonymous',
+            arbiter_addr=registry_addr,
             loglevel=loglevel,
             enable_modules=enable_modules,
         )
-        # DO NOT use the registry_addrs as the transport server
-        # addrs for this new non-registar, root-actor.
-        for host, port in ponged_addrs:
-            # NOTE: zero triggers dynamic OS port allocation
-            trans_bind_addrs.append((host, 0))
+        host, port = (host, 0)
 
-    # Start this local actor as the "registrar", aka a regular
-    # actor who manages the local registry of "mailboxes" of
-    # other process-tree-local sub-actors.
     else:
+        # start this local actor as the arbiter (aka a regular actor who
+        # manages the local registry of "mailboxes")
 
-        # NOTE that if the current actor IS THE REGISTAR, the
-        # following init steps are taken:
-        # - the tranport layer server is bound to each (host, port)
-        #   pair defined in provided registry_addrs, or the default.
-        trans_bind_addrs = registry_addrs
-
-        # - it is normally desirable for any registrar to stay up
-        #   indefinitely until either all registered (child/sub)
-        #   actors are terminated (via SC supervision) or,
-        #   a re-election process has taken place. 
-        # NOTE: all of ^ which is not implemented yet - see:
-        # https://github.com/goodboy/tractor/issues/216
-        # https://github.com/goodboy/tractor/pull/348
-        # https://github.com/goodboy/tractor/issues/296
+        # Note that if the current actor is the arbiter it is desirable
+        # for it to stay up indefinitely until a re-election process has
+        # taken place - which is not implemented yet FYI).
 
         actor = Arbiter(
-            name or 'registrar',
-            registry_addrs=registry_addrs,
+            name or 'arbiter',
+            arbiter_addr=registry_addr,
             loglevel=loglevel,
             enable_modules=enable_modules,
         )
 
-    # Start up main task set via core actor-runtime nurseries.
     try:
         # assign process-local actor
         _state._current_actor = actor
 
         # start local channel-server and fake the portal API
         # NOTE: this won't block since we provide the nursery
-        ml_addrs_str: str = '\n'.join(
-            f'@{addr}' for addr in trans_bind_addrs
-        )
-        logger.info(
-            f'Starting local {actor.uid} on the following transport addrs:\n'
-            f'{ml_addrs_str}'
-        )
+        logger.info(f"Starting local {actor} @ {host}:{port}")
 
         # start the actor runtime in a new task
         async with trio.open_nursery() as nursery:
 
-            # ``_runtime.async_main()`` creates an internal nursery
-            # and blocks here until any underlying actor(-process)
-            # tree has terminated thereby conducting so called
-            # "end-to-end" structured concurrency throughout an
-            # entire hierarchical python sub-process set; all
-            # "actor runtime" primitives are SC-compat and thus all
-            # transitively spawned actors/processes must be as
-            # well.
+            # ``_runtime.async_main()`` creates an internal nursery and
+            # thus blocks here until the entire underlying actor tree has
+            # terminated thereby conducting structured concurrency.
+
             await nursery.start(
                 partial(
                     async_main,
                     actor,
-                    accept_addrs=trans_bind_addrs,
+                    accept_addr=(host, port),
                     parent_addr=None
                 )
             )
             try:
                 yield actor
+
             except (
                 Exception,
                 BaseExceptionGroup,
             ) as err:
-                # XXX NOTE XXX see equiv note inside
-                # `._runtime.Actor._stream_handler()` where in the
-                # non-root or root-that-opened-this-mahually case we
-                # wait for the local actor-nursery to exit before
-                # exiting the transport channel handler.
-                entered: bool = await _debug._maybe_enter_pm(
-                    err,
-                    api_frame=inspect.currentframe(),
-                )
-                if (
-                    not entered
-                    and
-                    not is_multi_cancelled(err)
-                ):
-                    logger.exception('Root actor crashed\n')
 
-                # ALWAYS re-raise any error bubbled up from the
-                # runtime!
+                entered = await _debug._maybe_enter_pm(err)
+
+                if not entered and not is_multi_cancelled(err):
+                    logger.exception("Root actor crashed:")
+
+                # always re-raise
                 raise
 
             finally:
@@ -401,29 +253,18 @@ async def open_root_actor(
                 #     for an in nurseries:
                 #         tempn.start_soon(an.exited.wait)
 
-                logger.info(
-                    'Closing down root actor'
-                )
-                await actor.cancel(None)  # self cancel
+                logger.cancel("Shutting down root actor")
+                await actor.cancel()
     finally:
         _state._current_actor = None
-        _state._last_actor_terminated = actor
 
-        # restore built-in `breakpoint()` hook state
-        if (
-            debug_mode
-            and
-            maybe_enable_greenback
-        ):
-            if builtin_bp_handler is not None:
-                sys.breakpointhook = builtin_bp_handler
-
-            if orig_bp_path is not None:
-                os.environ['PYTHONBREAKPOINT'] = orig_bp_path
-
-            else:
-                # clear env back to having no entry
-                os.environ.pop('PYTHONBREAKPOINT', None)
+        # restore breakpoint hook state
+        sys.breakpointhook = builtin_bp_handler
+        if orig_bp_path is not None:
+            os.environ['PYTHONBREAKPOINT'] = orig_bp_path
+        else:
+            # clear env back to having no entry
+            os.environ.pop('PYTHONBREAKPOINT')
 
         logger.runtime("Root actor terminated")
 
@@ -433,7 +274,10 @@ def run_daemon(
 
     # runtime kwargs
     name: str | None = 'root',
-    registry_addrs: list[tuple[str, int]] = _default_lo_addrs,
+    registry_addr: tuple[str, int] = (
+        _default_arbiter_host,
+        _default_arbiter_port,
+    ),
 
     start_method: str | None = None,
     debug_mode: bool = False,
@@ -457,7 +301,7 @@ def run_daemon(
     async def _main():
 
         async with open_root_actor(
-            registry_addrs=registry_addrs,
+            registry_addr=registry_addr,
             name=name,
             start_method=start_method,
             debug_mode=debug_mode,

tractor/_shm.py

@@ -1,833 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-"""
-SC friendly shared memory management geared at real-time
-processing.
-
-Support for ``numpy`` compatible array-buffers is provided but is
-considered optional within the context of this runtime-library.
-
-"""
-from __future__ import annotations
-from sys import byteorder
-import time
-from typing import Optional
-from multiprocessing import shared_memory as shm
-from multiprocessing.shared_memory import (
-    SharedMemory,
-    ShareableList,
-)
-
-from msgspec import Struct
-import tractor
-
-from .log import get_logger
-
-
-_USE_POSIX = getattr(shm, '_USE_POSIX', False)
-if _USE_POSIX:
-    from _posixshmem import shm_unlink
-
-
-try:
-    import numpy as np
-    from numpy.lib import recfunctions as rfn
-    # import nptyping
-except ImportError:
-    pass
-
-
-log = get_logger(__name__)
-
-
-def disable_mantracker():
-    '''
-    Disable all ``multiprocessing``` "resource tracking" machinery since
-    it's an absolute multi-threaded mess of non-SC madness.
-
-    '''
-    from multiprocessing import resource_tracker as mantracker
-
-    # Tell the "resource tracker" thing to fuck off.
-    class ManTracker(mantracker.ResourceTracker):
-        def register(self, name, rtype):
-            pass
-
-        def unregister(self, name, rtype):
-            pass
-
-        def ensure_running(self):
-            pass
-
-    # "know your land and know your prey"
-    # https://www.dailymotion.com/video/x6ozzco
-    mantracker._resource_tracker = ManTracker()
-    mantracker.register = mantracker._resource_tracker.register
-    mantracker.ensure_running = mantracker._resource_tracker.ensure_running
-    mantracker.unregister = mantracker._resource_tracker.unregister
-    mantracker.getfd = mantracker._resource_tracker.getfd
-
-
-disable_mantracker()
-
-
-class SharedInt:
-    '''
-    Wrapper around a single entry shared memory array which
-    holds an ``int`` value used as an index counter.
-
-    '''
-    def __init__(
-        self,
-        shm: SharedMemory,
-    ) -> None:
-        self._shm = shm
-
-    @property
-    def value(self) -> int:
-        return int.from_bytes(self._shm.buf, byteorder)
-
-    @value.setter
-    def value(self, value) -> None:
-        self._shm.buf[:] = value.to_bytes(self._shm.size, byteorder)
-
-    def destroy(self) -> None:
-        if _USE_POSIX:
-            # We manually unlink to bypass all the "resource tracker"
-            # nonsense meant for non-SC systems.
-            name = self._shm.name
-            try:
-                shm_unlink(name)
-            except FileNotFoundError:
-                # might be a teardown race here?
-                log.warning(f'Shm for {name} already unlinked?')
-
-
-class NDToken(Struct, frozen=True):
-    '''
-    Internal represenation of a shared memory ``numpy`` array "token"
-    which can be used to key and load a system (OS) wide shm entry
-    and correctly read the array by type signature.
-
-    This type is msg safe.
-
-    '''
-    shm_name: str  # this servers as a "key" value
-    shm_first_index_name: str
-    shm_last_index_name: str
-    dtype_descr: tuple
-    size: int  # in struct-array index / row terms
-
-    # TODO: use nptyping here on dtypes
-    @property
-    def dtype(self) -> list[tuple[str, str, tuple[int, ...]]]:
-        return np.dtype(
-            list(
-                map(tuple, self.dtype_descr)
-            )
-        ).descr
-
-    def as_msg(self):
-        return self.to_dict()
-
-    @classmethod
-    def from_msg(cls, msg: dict) -> NDToken:
-        if isinstance(msg, NDToken):
-            return msg
-
-        # TODO: native struct decoding
-        # return _token_dec.decode(msg)
-
-        msg['dtype_descr'] = tuple(map(tuple, msg['dtype_descr']))
-        return NDToken(**msg)
-
-
-# _token_dec = msgspec.msgpack.Decoder(NDToken)
-
-# TODO: this api?
-# _known_tokens = tractor.ActorVar('_shm_tokens', {})
-# _known_tokens = tractor.ContextStack('_known_tokens', )
-# _known_tokens = trio.RunVar('shms', {})
-
-# TODO: this should maybe be provided via
-# a `.trionics.maybe_open_context()` wrapper factory?
-# process-local store of keys to tokens
-_known_tokens: dict[str, NDToken] = {}
-
-
-def get_shm_token(key: str) -> NDToken | None:
-    '''
-    Convenience func to check if a token
-    for the provided key is known by this process.
-
-    Returns either the ``numpy`` token or a string for a shared list.
-
-    '''
-    return _known_tokens.get(key)
-
-
-def _make_token(
-    key: str,
-    size: int,
-    dtype: np.dtype,
-
-) -> NDToken:
-    '''
-    Create a serializable token that can be used
-    to access a shared array.
-
-    '''
-    return NDToken(
-        shm_name=key,
-        shm_first_index_name=key + "_first",
-        shm_last_index_name=key + "_last",
-        dtype_descr=tuple(np.dtype(dtype).descr),
-        size=size,
-    )
-
-
-class ShmArray:
-    '''
-    A shared memory ``numpy.ndarray`` API.
-
-    An underlying shared memory buffer is allocated based on
-    a user specified ``numpy.ndarray``. This fixed size array
-    can be read and written to by pushing data both onto the "front"
-    or "back" of a set index range. The indexes for the "first" and
-    "last" index are themselves stored in shared memory (accessed via
-    ``SharedInt`` interfaces) values such that multiple processes can
-    interact with the same array using a synchronized-index.
-
-    '''
-    def __init__(
-        self,
-        shmarr: np.ndarray,
-        first: SharedInt,
-        last: SharedInt,
-        shm: SharedMemory,
-        # readonly: bool = True,
-    ) -> None:
-        self._array = shmarr
-
-        # indexes for first and last indices corresponding
-        # to fille data
-        self._first = first
-        self._last = last
-
-        self._len = len(shmarr)
-        self._shm = shm
-        self._post_init: bool = False
-
-        # pushing data does not write the index (aka primary key)
-        self._write_fields: list[str] | None = None
-        dtype = shmarr.dtype
-        if dtype.fields:
-            self._write_fields = list(shmarr.dtype.fields.keys())[1:]
-
-    # TODO: ringbuf api?
-
-    @property
-    def _token(self) -> NDToken:
-        return NDToken(
-            shm_name=self._shm.name,
-            shm_first_index_name=self._first._shm.name,
-            shm_last_index_name=self._last._shm.name,
-            dtype_descr=tuple(self._array.dtype.descr),
-            size=self._len,
-        )
-
-    @property
-    def token(self) -> dict:
-        """Shared memory token that can be serialized and used by
-        another process to attach to this array.
-        """
-        return self._token.as_msg()
-
-    @property
-    def index(self) -> int:
-        return self._last.value % self._len
-
-    @property
-    def array(self) -> np.ndarray:
-        '''
-        Return an up-to-date ``np.ndarray`` view of the
-        so-far-written data to the underlying shm buffer.
-
-        '''
-        a = self._array[self._first.value:self._last.value]
-
-        # first, last = self._first.value, self._last.value
-        # a = self._array[first:last]
-
-        # TODO: eventually comment this once we've not seen it in the
-        # wild in a long time..
-        # XXX: race where first/last indexes cause a reader
-        # to load an empty array..
-        if len(a) == 0 and self._post_init:
-            raise RuntimeError('Empty array race condition hit!?')
-            # breakpoint()
-
-        return a
-
-    def ustruct(
-        self,
-        fields: Optional[list[str]] = None,
-
-        # type that all field values will be cast to
-        # in the returned view.
-        common_dtype: np.dtype = float,
-
-    ) -> np.ndarray:
-
-        array = self._array
-
-        if fields:
-            selection = array[fields]
-            # fcount = len(fields)
-        else:
-            selection = array
-            # fcount = len(array.dtype.fields)
-
-        # XXX: manual ``.view()`` attempt that also doesn't work.
-        # uview = selection.view(
-        #     dtype='<f16',
-        # ).reshape(-1, 4, order='A')
-
-        # assert len(selection) == len(uview)
-
-        u = rfn.structured_to_unstructured(
-            selection,
-            # dtype=float,
-            copy=True,
-        )
-
-        # unstruct = np.ndarray(u.shape, dtype=a.dtype, buffer=shm.buf)
-        # array[:] = a[:]
-        return u
-        # return ShmArray(
-        #     shmarr=u,
-        #     first=self._first,
-        #     last=self._last,
-        #     shm=self._shm
-        # )
-
-    def last(
-        self,
-        length: int = 1,
-
-    ) -> np.ndarray:
-        '''
-        Return the last ``length``'s worth of ("row") entries from the
-        array.
-
-        '''
-        return self.array[-length:]
-
-    def push(
-        self,
-        data: np.ndarray,
-
-        field_map: Optional[dict[str, str]] = None,
-        prepend: bool = False,
-        update_first: bool = True,
-        start: int | None = None,
-
-    ) -> int:
-        '''
-        Ring buffer like "push" to append data
-        into the buffer and return updated "last" index.
-
-        NB: no actual ring logic yet to give a "loop around" on overflow
-        condition, lel.
-
-        '''
-        length = len(data)
-
-        if prepend:
-            index = (start or self._first.value) - length
-
-            if index < 0:
-                raise ValueError(
-                    f'Array size of {self._len} was overrun during prepend.\n'
-                    f'You have passed {abs(index)} too many datums.'
-                )
-
-        else:
-            index = start if start is not None else self._last.value
-
-        end = index + length
-
-        if field_map:
-            src_names, dst_names = zip(*field_map.items())
-        else:
-            dst_names = src_names = self._write_fields
-
-        try:
-            self._array[
-                list(dst_names)
-            ][index:end] = data[list(src_names)][:]
-
-            # NOTE: there was a race here between updating
-            # the first and last indices and when the next reader
-            # tries to access ``.array`` (which due to the index
-            # overlap will be empty). Pretty sure we've fixed it now
-            # but leaving this here as a reminder.
-            if (
-                prepend
-                and update_first
-                and length
-            ):
-                assert index < self._first.value
-
-            if (
-                index < self._first.value
-                and update_first
-            ):
-                assert prepend, 'prepend=True not passed but index decreased?'
-                self._first.value = index
-
-            elif not prepend:
-                self._last.value = end
-
-            self._post_init = True
-            return end
-
-        except ValueError as err:
-            if field_map:
-                raise
-
-            # should raise if diff detected
-            self.diff_err_fields(data)
-            raise err
-
-    def diff_err_fields(
-        self,
-        data: np.ndarray,
-    ) -> None:
-        # reraise with any field discrepancy
-        our_fields, their_fields = (
-            set(self._array.dtype.fields),
-            set(data.dtype.fields),
-        )
-
-        only_in_ours = our_fields - their_fields
-        only_in_theirs = their_fields - our_fields
-
-        if only_in_ours:
-            raise TypeError(
-                f"Input array is missing field(s): {only_in_ours}"
-            )
-        elif only_in_theirs:
-            raise TypeError(
-                f"Input array has unknown field(s): {only_in_theirs}"
-            )
-
-    # TODO: support "silent" prepends that don't update ._first.value?
-    def prepend(
-        self,
-        data: np.ndarray,
-    ) -> int:
-        end = self.push(data, prepend=True)
-        assert end
-
-    def close(self) -> None:
-        self._first._shm.close()
-        self._last._shm.close()
-        self._shm.close()
-
-    def destroy(self) -> None:
-        if _USE_POSIX:
-            # We manually unlink to bypass all the "resource tracker"
-            # nonsense meant for non-SC systems.
-            shm_unlink(self._shm.name)
-
-        self._first.destroy()
-        self._last.destroy()
-
-    def flush(self) -> None:
-        # TODO: flush to storage backend like markestore?
-        ...
-
-
-def open_shm_ndarray(
-    size: int,
-    key: str | None = None,
-    dtype: np.dtype | None = None,
-    append_start_index: int | None = None,
-    readonly: bool = False,
-
-) -> ShmArray:
-    '''
-    Open a memory shared ``numpy`` using the standard library.
-
-    This call unlinks (aka permanently destroys) the buffer on teardown
-    and thus should be used from the parent-most accessor (process).
-
-    '''
-    # create new shared mem segment for which we
-    # have write permission
-    a = np.zeros(size, dtype=dtype)
-    a['index'] = np.arange(len(a))
-
-    shm = SharedMemory(
-        name=key,
-        create=True,
-        size=a.nbytes
-    )
-    array = np.ndarray(
-        a.shape,
-        dtype=a.dtype,
-        buffer=shm.buf
-    )
-    array[:] = a[:]
-    array.setflags(write=int(not readonly))
-
-    token = _make_token(
-        key=key,
-        size=size,
-        dtype=dtype,
-    )
-
-    # create single entry arrays for storing an first and last indices
-    first = SharedInt(
-        shm=SharedMemory(
-            name=token.shm_first_index_name,
-            create=True,
-            size=4,  # std int
-        )
-    )
-
-    last = SharedInt(
-        shm=SharedMemory(
-            name=token.shm_last_index_name,
-            create=True,
-            size=4,  # std int
-        )
-    )
-
-    # Start the "real-time" append-updated (or "pushed-to") section
-    # after some start index: ``append_start_index``. This allows appending
-    # from a start point in the array which isn't the 0 index and looks
-    # something like,
-    # -------------------------
-    # |              |        i
-    # _________________________
-    # <-------------> <------->
-    #  history         real-time
-    #
-    # Once fully "prepended", the history section will leave the
-    # ``ShmArray._start.value: int = 0`` and the yet-to-be written
-    # real-time section will start at ``ShmArray.index: int``.
-
-    # this sets the index to nearly 2/3rds into the the length of
-    # the buffer leaving at least a "days worth of second samples"
-    # for the real-time section.
-    if append_start_index is None:
-        append_start_index = round(size * 0.616)
-
-    last.value = first.value = append_start_index
-
-    shmarr = ShmArray(
-        array,
-        first,
-        last,
-        shm,
-    )
-
-    assert shmarr._token == token
-    _known_tokens[key] = shmarr.token
-
-    # "unlink" created shm on process teardown by
-    # pushing teardown calls onto actor context stack
-    stack = tractor.current_actor().lifetime_stack
-    stack.callback(shmarr.close)
-    stack.callback(shmarr.destroy)
-
-    return shmarr
-
-
-def attach_shm_ndarray(
-    token: tuple[str, str, tuple[str, str]],
-    readonly: bool = True,
-
-) -> ShmArray:
-    '''
-    Attach to an existing shared memory array previously
-    created by another process using ``open_shared_array``.
-
-    No new shared mem is allocated but wrapper types for read/write
-    access are constructed.
-
-    '''
-    token = NDToken.from_msg(token)
-    key = token.shm_name
-
-    if key in _known_tokens:
-        assert NDToken.from_msg(_known_tokens[key]) == token, "WTF"
-
-    # XXX: ugh, looks like due to the ``shm_open()`` C api we can't
-    # actually place files in a subdir, see discussion here:
-    # https://stackoverflow.com/a/11103289
-
-    # attach to array buffer and view as per dtype
-    _err: Optional[Exception] = None
-    for _ in range(3):
-        try:
-            shm = SharedMemory(
-                name=key,
-                create=False,
-            )
-            break
-        except OSError as oserr:
-            _err = oserr
-            time.sleep(0.1)
-    else:
-        if _err:
-            raise _err
-
-    shmarr = np.ndarray(
-        (token.size,),
-        dtype=token.dtype,
-        buffer=shm.buf
-    )
-    shmarr.setflags(write=int(not readonly))
-
-    first = SharedInt(
-        shm=SharedMemory(
-            name=token.shm_first_index_name,
-            create=False,
-            size=4,  # std int
-        ),
-    )
-    last = SharedInt(
-        shm=SharedMemory(
-            name=token.shm_last_index_name,
-            create=False,
-            size=4,  # std int
-        ),
-    )
-
-    # make sure we can read
-    first.value
-
-    sha = ShmArray(
-        shmarr,
-        first,
-        last,
-        shm,
-    )
-    # read test
-    sha.array
-
-    # Stash key -> token knowledge for future queries
-    # via `maybe_opepn_shm_array()` but only after we know
-    # we can attach.
-    if key not in _known_tokens:
-        _known_tokens[key] = token
-
-    # "close" attached shm on actor teardown
-    tractor.current_actor().lifetime_stack.callback(sha.close)
-
-    return sha
-
-
-def maybe_open_shm_ndarray(
-    key: str,  # unique identifier for segment
-    size: int,
-    dtype: np.dtype | None = None,
-    append_start_index: int = 0,
-    readonly: bool = True,
-
-) -> tuple[ShmArray, bool]:
-    '''
-    Attempt to attach to a shared memory block using a "key" lookup
-    to registered blocks in the users overall "system" registry
-    (presumes you don't have the block's explicit token).
-
-    This function is meant to solve the problem of discovering whether
-    a shared array token has been allocated or discovered by the actor
-    running in **this** process. Systems where multiple actors may seek
-    to access a common block can use this function to attempt to acquire
-    a token as discovered by the actors who have previously stored
-    a "key" -> ``NDToken`` map in an actor local (aka python global)
-    variable.
-
-    If you know the explicit ``NDToken`` for your memory segment instead
-    use ``attach_shm_array``.
-
-    '''
-    try:
-        # see if we already know this key
-        token = _known_tokens[key]
-        return (
-            attach_shm_ndarray(
-                token=token,
-                readonly=readonly,
-            ),
-            False,  # not newly opened
-        )
-    except KeyError:
-        log.warning(f"Could not find {key} in shms cache")
-        if dtype:
-            token = _make_token(
-                key,
-                size=size,
-                dtype=dtype,
-            )
-        else:
-
-            try:
-                return (
-                    attach_shm_ndarray(
-                        token=token,
-                        readonly=readonly,
-                    ),
-                    False,
-                )
-            except FileNotFoundError:
-                log.warning(f"Could not attach to shm with token {token}")
-
-        # This actor does not know about memory
-        # associated with the provided "key".
-        # Attempt to open a block and expect
-        # to fail if a block has been allocated
-        # on the OS by someone else.
-        return (
-            open_shm_ndarray(
-                key=key,
-                size=size,
-                dtype=dtype,
-                append_start_index=append_start_index,
-                readonly=readonly,
-            ),
-            True,
-        )
-
-
-class ShmList(ShareableList):
-    '''
-    Carbon copy of ``.shared_memory.ShareableList`` with a few
-    enhancements:
-
-    - readonly mode via instance var flag  `._readonly: bool`
-    - ``.__getitem__()`` accepts ``slice`` inputs
-    - exposes the underlying buffer "name" as a ``.key: str``
-
-    '''
-    def __init__(
-        self,
-        sequence: list | None = None,
-        *,
-        name: str | None = None,
-        readonly: bool = True
-
-    ) -> None:
-        self._readonly = readonly
-        self._key = name
-        return super().__init__(
-            sequence=sequence,
-            name=name,
-        )
-
-    @property
-    def key(self) -> str:
-        return self._key
-
-    @property
-    def readonly(self) -> bool:
-        return self._readonly
-
-    def __setitem__(
-        self,
-        position,
-        value,
-
-    ) -> None:
-
-        # mimick ``numpy`` error
-        if self._readonly:
-            raise ValueError('assignment destination is read-only')
-
-        return super().__setitem__(position, value)
-
-    def __getitem__(
-        self,
-        indexish,
-    ) -> list:
-
-        # NOTE: this is a non-writeable view (copy?) of the buffer
-        # in a new list instance.
-        if isinstance(indexish, slice):
-            return list(self)[indexish]
-
-        return super().__getitem__(indexish)
-
-    # TODO: should we offer a `.array` and `.push()` equivalent
-    # to the `ShmArray`?
-    # currently we have the following limitations:
-    # - can't write slices of input using traditional slice-assign
-    #   syntax due to the ``ShareableList.__setitem__()`` implementation.
-    # - ``list(shmlist)`` returns a non-mutable copy instead of
-    #   a writeable view which would be handier numpy-style ops.
-
-
-def open_shm_list(
-    key: str,
-    sequence: list | None = None,
-    size: int = int(2 ** 10),
-    dtype: float | int | bool | str | bytes | None = float,
-    readonly: bool = True,
-
-) -> ShmList:
-
-    if sequence is None:
-        default = {
-            float: 0.,
-            int: 0,
-            bool: True,
-            str: 'doggy',
-            None: None,
-        }[dtype]
-        sequence = [default] * size
-
-    shml = ShmList(
-        sequence=sequence,
-        name=key,
-        readonly=readonly,
-    )
-
-    # "close" attached shm on actor teardown
-    try:
-        actor = tractor.current_actor()
-        actor.lifetime_stack.callback(shml.shm.close)
-        actor.lifetime_stack.callback(shml.shm.unlink)
-    except RuntimeError:
-        log.warning('tractor runtime not active, skipping teardown steps')
-
-    return shml
-
-
-def attach_shm_list(
-    key: str,
-    readonly: bool = False,
-
-) -> ShmList:
-
-    return ShmList(
-        name=key,
-        readonly=readonly,
-    )

tractor/_spawn.py

@@ -19,7 +19,6 @@ Machinery for actor process spawning using multiple backends.
 
 """
 from __future__ import annotations
-import multiprocessing as mp
 import sys
 import platform
 from typing import (
@@ -31,32 +30,30 @@ from typing import (
     TYPE_CHECKING,
 )
 
+from exceptiongroup import BaseExceptionGroup
 import trio
-from trio import TaskStatus
+from trio_typing import TaskStatus
 
-from tractor.devx import (
+from ._debug import (
     maybe_wait_for_debugger,
     acquire_debug_lock,
 )
-from tractor._state import (
+from ._state import (
     current_actor,
     is_main_process,
     is_root_process,
     debug_mode,
-    _runtime_vars,
-)
-from tractor.log import get_logger
-from tractor._portal import Portal
-from tractor._runtime import Actor
-from tractor._entry import _mp_main
-from tractor._exceptions import ActorFailure
-from tractor.msg.types import (
-    SpawnSpec,
 )
+from .log import get_logger
+from ._portal import Portal
+from ._runtime import Actor
+from ._entry import _mp_main
+from ._exceptions import ActorFailure
 
 
 if TYPE_CHECKING:
     from ._supervise import ActorNursery
+    import multiprocessing as mp
     ProcessType = TypeVar('ProcessType', mp.Process, trio.Process)
 
 log = get_logger('tractor')
@@ -73,6 +70,7 @@ _spawn_method: SpawnMethodKey = 'trio'
 
 if platform.system() == 'Windows':
 
+    import multiprocessing as mp
     _ctx = mp.get_context("spawn")
 
     async def proc_waiter(proc: mp.Process) -> None:
@@ -143,13 +141,11 @@ async def exhaust_portal(
     '''
     __tracebackhide__ = True
     try:
-        log.debug(
-            f'Waiting on final result from {actor.uid}'
-        )
+        log.debug(f"Waiting on final result from {actor.uid}")
 
         # XXX: streams should never be reaped here since they should
         # always be established and shutdown using a context manager api
-        final: Any = await portal.wait_for_result()
+        final = await portal.result()
 
     except (
         Exception,
@@ -157,23 +153,13 @@ async def exhaust_portal(
     ) as err:
         # we reraise in the parent task via a ``BaseExceptionGroup``
         return err
-
     except trio.Cancelled as err:
         # lol, of course we need this too ;P
         # TODO: merge with above?
-        log.warning(
-            'Cancelled portal result waiter task:\n'
-            f'uid: {portal.channel.uid}\n'
-            f'error: {err}\n'
-        )
+        log.warning(f"Cancelled result waiter for {portal.actor.uid}")
         return err
-
     else:
-        log.debug(
-            f'Returning final result from portal:\n'
-            f'uid: {portal.channel.uid}\n'
-            f'result: {final}\n'
-        )
+        log.debug(f"Returning final result: {final}")
         return final
 
 
@@ -185,75 +171,41 @@ async def cancel_on_completion(
 
 ) -> None:
     '''
-    Cancel actor gracefully once its "main" portal's
+    Cancel actor gracefully once it's "main" portal's
     result arrives.
 
-    Should only be called for actors spawned via the
-    `Portal.run_in_actor()` API.
-
-    => and really this API will be deprecated and should be
-    re-implemented as a `.hilevel.one_shot_task_nursery()`..)
+    Should only be called for actors spawned with `run_in_actor()`.
 
     '''
     # if this call errors we store the exception for later
     # in ``errors`` which will be reraised inside
     # an exception group and we still send out a cancel request
-    result: Any|Exception = await exhaust_portal(
-        portal,
-        actor,
-    )
+    result = await exhaust_portal(portal, actor)
     if isinstance(result, Exception):
-        errors[actor.uid]: Exception = result
-        log.cancel(
-            'Cancelling subactor runtime due to error:\n\n'
-            f'Portal.cancel_actor() => {portal.channel.uid}\n\n'
-            f'error: {result}\n'
+        errors[actor.uid] = result
+        log.warning(
+            f"Cancelling {portal.channel.uid} after error {result}"
         )
 
     else:
         log.runtime(
-            'Cancelling subactor gracefully:\n\n'
-            f'Portal.cancel_actor() => {portal.channel.uid}\n\n'
-            f'result: {result}\n'
-        )
+            f"Cancelling {portal.channel.uid} gracefully "
+            f"after result {result}")
 
     # cancel the process now that we have a final result
     await portal.cancel_actor()
 
 
-async def hard_kill(
+async def do_hard_kill(
     proc: trio.Process,
-
-    terminate_after: int = 1.6,
-    # NOTE: for mucking with `.pause()`-ing inside the runtime
-    # whilst also hacking on it XD
-    # terminate_after: int = 99999,
+    terminate_after: int = 3,
 
 ) -> None:
-    '''
-    Un-gracefully terminate an OS level `trio.Process` after timeout.
-
-    Used in 2 main cases:
-
-    - "unknown remote runtime state": a hanging/stalled actor that
-      isn't responding after sending a (graceful) runtime cancel
-      request via an IPC msg.
-    - "cancelled during spawn": a process who's actor runtime was
-      cancelled before full startup completed (such that
-      cancel-request-handling machinery was never fully
-      initialized) and thus a "cancel request msg" is never going
-      to be handled.
-
-    '''
-    log.cancel(
-        'Terminating sub-proc\n'
-        f'>x)\n'
-        f' |_{proc}\n'
-    )
     # NOTE: this timeout used to do nothing since we were shielding
     # the ``.wait()`` inside ``new_proc()`` which will pretty much
     # never release until the process exits, now it acts as
     # a hard-kill time ultimatum.
+    log.debug(f"Terminating {proc}")
     with trio.move_on_after(terminate_after) as cs:
 
         # NOTE: code below was copied verbatim from the now deprecated
@@ -264,9 +216,6 @@ async def hard_kill(
         # and wait for it to exit. If cancelled, kills the process and
         # waits for it to finish exiting before propagating the
         # cancellation.
-        #
-        # This code was originally triggred by ``proc.__aexit__()``
-        # but now must be called manually.
         with trio.CancelScope(shield=True):
             if proc.stdin is not None:
                 await proc.stdin.aclose()
@@ -282,25 +231,16 @@ async def hard_kill(
                 with trio.CancelScope(shield=True):
                     await proc.wait()
 
-    # XXX NOTE XXX: zombie squad dispatch:
-    # (should ideally never, but) If we do get here it means
-    # graceful termination of a process failed and we need to
-    # resort to OS level signalling to interrupt and cancel the
-    # (presumably stalled or hung) actor. Since we never allow
-    # zombies (as a feature) we ask the OS to do send in the
-    # removal swad as the last resort.
     if cs.cancelled_caught:
-        # TODO: toss in the skynet-logo face as ascii art?
-        log.critical(
-            # 'Well, the #ZOMBIE_LORD_IS_HERE# to collect\n'
-            '#T-800 deployed to collect zombie B0\n'
-            f'>x)\n'
-            f' |_{proc}\n'
-        )
+        # XXX: should pretty much never get here unless we have
+        # to move the bits from ``proc.__aexit__()`` out and
+        # into here.
+        log.critical(f"#ZOMBIE_LORD_IS_HERE: {proc}")
         proc.kill()
 
 
-async def soft_kill(
+async def soft_wait(
+
     proc: ProcessType,
     wait_func: Callable[
         [ProcessType],
@@ -309,40 +249,15 @@ async def soft_kill(
     portal: Portal,
 
 ) -> None:
-    '''
-    Wait for proc termination but **don't yet** teardown
-    std-streams since it will clobber any ongoing pdb REPL
-    session.
-
-    This is our "soft"/graceful, and thus itself also cancellable,
-    join/reap on an actor-runtime-in-process shutdown; it is
-    **not** the same as a "hard kill" via an OS signal (for that
-    see `.hard_kill()`).
-
-    '''
-    uid: tuple[str, str] = portal.channel.uid
+    # Wait for proc termination but **dont' yet** call
+    # ``trio.Process.__aexit__()`` (it tears down stdio
+    # which will kill any waiting remote pdb trace).
+    # This is a "soft" (cancellable) join/reap.
+    uid = portal.channel.uid
     try:
-        log.cancel(
-            'Soft killing sub-actor via portal request\n'
-            f'c)> {portal.chan.uid}\n'
-            f' |_{proc}\n'
-        )
-        # wait on sub-proc to signal termination
+        log.cancel(f'Soft waiting on actor:\n{uid}')
         await wait_func(proc)
-
     except trio.Cancelled:
-        with trio.CancelScope(shield=True):
-            await maybe_wait_for_debugger(
-                child_in_debug=_runtime_vars.get(
-                    '_debug_mode', False
-                ),
-                header_msg=(
-                    'Delaying `soft_kill()` subproc reaper while debugger locked..\n'
-                ),
-                # TODO: need a diff value then default?
-                # poll_steps=9999999,
-            )
-
         # if cancelled during a soft wait, cancel the child
         # actor before entering the hard reap sequence
         # below. This means we try to do a graceful teardown
@@ -353,29 +268,22 @@ async def soft_kill(
 
             async def cancel_on_proc_deth():
                 '''
-                "Cancel-the-cancel" request: if we detect that the
-                underlying sub-process exited prior to
-                a `Portal.cancel_actor()` call completing .
+                Cancel the actor cancel request if we detect that
+                that the process terminated.
 
                 '''
                 await wait_func(proc)
                 n.cancel_scope.cancel()
 
-            # start a task to wait on the termination of the
-            # process by itself waiting on a (caller provided) wait
-            # function which should unblock when the target process
-            # has terminated.
             n.start_soon(cancel_on_proc_deth)
-
-            # send the actor-runtime a cancel request.
             await portal.cancel_actor()
 
             if proc.poll() is None:  # type: ignore
                 log.warning(
-                    'Subactor still alive after cancel request?\n\n'
-                    f'uid: {uid}\n'
-                    f'|_{proc}\n'
+                    'Actor still alive after cancel request:\n'
+                    f'{uid}'
                 )
+
                 n.cancel_scope.cancel()
         raise
 
@@ -387,7 +295,7 @@ async def new_proc(
     errors: dict[tuple[str, str], Exception],
 
     # passed through to actor main
-    bind_addrs: list[tuple[str, int]],
+    bind_addr: tuple[str, int],
     parent_addr: tuple[str, int],
     _runtime_vars: dict[str, Any],  # serialized and sent to _child
 
@@ -399,7 +307,7 @@ async def new_proc(
 ) -> None:
 
     # lookup backend spawning target
-    target: Callable = _methods[_spawn_method]
+    target = _methods[_spawn_method]
 
     # mark the new actor with the global spawn method
     subactor._spawn_method = _spawn_method
@@ -409,7 +317,7 @@ async def new_proc(
         actor_nursery,
         subactor,
         errors,
-        bind_addrs,
+        bind_addr,
         parent_addr,
         _runtime_vars,  # run time vars
         infect_asyncio=infect_asyncio,
@@ -424,7 +332,7 @@ async def trio_proc(
     errors: dict[tuple[str, str], Exception],
 
     # passed through to actor main
-    bind_addrs: list[tuple[str, int]],
+    bind_addr: tuple[str, int],
     parent_addr: tuple[str, int],
     _runtime_vars: dict[str, Any],  # serialized and sent to _child
     *,
@@ -467,21 +375,19 @@ async def trio_proc(
         spawn_cmd.append("--asyncio")
 
     cancelled_during_spawn: bool = False
-    proc: trio.Process|None = None
+    proc: trio.Process | None = None
     try:
         try:
-            proc: trio.Process = await trio.lowlevel.open_process(spawn_cmd)
-            log.runtime(
-                'Started new child\n'
-                f'|_{proc}\n'
-            )
+            # TODO: needs ``trio_typing`` patch?
+            proc = await trio.lowlevel.open_process(spawn_cmd)
+
+            log.runtime(f"Started {proc}")
 
             # wait for actor to spawn and connect back to us
             # channel should have handshake completed by the
             # local actor by the time we get a ref to it
             event, chan = await actor_nursery._actor.wait_for_peer(
-                subactor.uid
-            )
+                subactor.uid)
 
         except trio.Cancelled:
             cancelled_during_spawn = True
@@ -510,20 +416,18 @@ async def trio_proc(
             portal,
         )
 
-        # send a "spawning specification" which configures the
-        # initial runtime state of the child.
-        await chan.send(
-            SpawnSpec(
-                _parent_main_data=subactor._parent_main_data,
-                enable_modules=subactor.enable_modules,
-                reg_addrs=subactor.reg_addrs,
-                bind_addrs=bind_addrs,
-                _runtime_vars=_runtime_vars,
-            )
-        )
+        # send additional init params
+        await chan.send({
+            "_parent_main_data": subactor._parent_main_data,
+            "enable_modules": subactor.enable_modules,
+            "_arb_addr": subactor._arb_addr,
+            "bind_host": bind_addr[0],
+            "bind_port": bind_addr[1],
+            "_runtime_vars": _runtime_vars,
+        })
 
         # track subactor in current nursery
-        curr_actor: Actor = current_actor()
+        curr_actor = current_actor()
         curr_actor._actoruid2nursery[subactor.uid] = actor_nursery
 
         # resume caller at next checkpoint now that child is up
@@ -545,7 +449,7 @@ async def trio_proc(
             # This is a "soft" (cancellable) join/reap which
             # will remote cancel the actor on a ``trio.Cancelled``
             # condition.
-            await soft_kill(
+            await soft_wait(
                 proc,
                 trio.Process.wait,
                 portal
@@ -553,11 +457,9 @@ async def trio_proc(
 
             # cancel result waiter that may have been spawned in
             # tandem if not done already
-            log.cancel(
-                'Cancelling portal result reaper task\n'
-                f'>c)\n'
-                f' |_{subactor.uid}\n'
-            )
+            log.warning(
+                "Cancelling existing result waiter task for "
+                f"{subactor.uid}")
             nursery.cancel_scope.cancel()
 
     finally:
@@ -565,13 +467,9 @@ async def trio_proc(
         # allowed! Do this **after** cancellation/teardown to avoid
         # killing the process too early.
         if proc:
-            log.cancel(
-                f'Hard reap sequence starting for subactor\n'
-                f'>x)\n'
-                f' |_{subactor}@{subactor.uid}\n'
-            )
-
+            log.cancel(f'Hard reap sequence starting for {subactor.uid}')
             with trio.CancelScope(shield=True):
+
                 # don't clobber an ongoing pdb
                 if cancelled_during_spawn:
                     # Try again to avoid TTY clobbering.
@@ -579,40 +477,22 @@ async def trio_proc(
                         with trio.move_on_after(0.5):
                             await proc.wait()
 
-                await maybe_wait_for_debugger(
-                    child_in_debug=_runtime_vars.get(
-                        '_debug_mode', False
-                    ),
-                    header_msg=(
-                        'Delaying subproc reaper while debugger locked..\n'
-                    ),
-
-                    # TODO: need a diff value then default?
-                    # poll_steps=9999999,
-                )
-                # TODO: solve the following issue where we need
-                # to do a similar wait like this but in an
-                # "intermediary" parent actor that itself isn't
-                # in debug but has a child that is, and we need
-                # to hold off on relaying SIGINT until that child
-                # is complete.
-                # https://github.com/goodboy/tractor/issues/320
-                # -[ ] we need to handle non-root parent-actors specially
-                # by somehow determining if a child is in debug and then
-                # avoiding cancel/kill of said child by this
-                # (intermediary) parent until such a time as the root says
-                # the pdb lock is released and we are good to tear down
-                # (our children)..
-                #
-                # -[ ] so maybe something like this where we try to
-                #     acquire the lock and get notified of who has it,
-                #     check that uid against our known children?
-                # this_uid: tuple[str, str] = current_actor().uid
-                # await acquire_debug_lock(this_uid)
+                if is_root_process():
+                    # TODO: solve the following issue where we need
+                    # to do a similar wait like this but in an
+                    # "intermediary" parent actor that itself isn't
+                    # in debug but has a child that is, and we need
+                    # to hold off on relaying SIGINT until that child
+                    # is complete.
+                    # https://github.com/goodboy/tractor/issues/320
+                    await maybe_wait_for_debugger(
+                        child_in_debug=_runtime_vars.get(
+                            '_debug_mode', False),
+                    )
 
                 if proc.poll() is None:
                     log.cancel(f"Attempting to hard kill {proc}")
-                    await hard_kill(proc)
+                    await do_hard_kill(proc)
 
                 log.debug(f"Joined {proc}")
         else:
@@ -630,7 +510,7 @@ async def mp_proc(
     subactor: Actor,
     errors: dict[tuple[str, str], Exception],
     # passed through to actor main
-    bind_addrs: list[tuple[str, int]],
+    bind_addr: tuple[str, int],
     parent_addr: tuple[str, int],
     _runtime_vars: dict[str, Any],  # serialized and sent to _child
     *,
@@ -688,7 +568,7 @@ async def mp_proc(
         target=_mp_main,
         args=(
             subactor,
-            bind_addrs,
+            bind_addr,
             fs_info,
             _spawn_method,
             parent_addr,
@@ -756,7 +636,7 @@ async def mp_proc(
             # This is a "soft" (cancellable) join/reap which
             # will remote cancel the actor on a ``trio.Cancelled``
             # condition.
-            await soft_kill(
+            await soft_wait(
                 proc,
                 proc_waiter,
                 portal

tractor/_state.py

@@ -18,127 +18,46 @@
 Per process state
 
 """
-from __future__ import annotations
-from contextvars import (
-    ContextVar,
-)
 from typing import (
+    Optional,
     Any,
-    TYPE_CHECKING,
 )
 
-from trio.lowlevel import current_task
+import trio
 
-if TYPE_CHECKING:
-    from ._runtime import Actor
-    from ._context import Context
+from ._exceptions import NoRuntime
 
 
-_current_actor: Actor|None = None  # type: ignore # noqa
-_last_actor_terminated: Actor|None = None
-
-# TODO: mk this a `msgspec.Struct`!
+_current_actor: Optional['Actor'] = None  # type: ignore # noqa
 _runtime_vars: dict[str, Any] = {
     '_debug_mode': False,
     '_is_root': False,
-    '_root_mailbox': (None, None),
-    '_registry_addrs': [],
-
-    '_is_infected_aio': False,
-
-    # for `tractor.pause_from_sync()` & `breakpoint()` support
-    'use_greenback': False,
+    '_root_mailbox': (None, None)
 }
 
 
-def last_actor() -> Actor|None:
-    '''
-    Try to return last active `Actor` singleton
-    for this process.
-
-    For case where runtime already exited but someone is asking
-    about the "last" actor probably to get its `.uid: tuple`.
-
-    '''
-    return _last_actor_terminated
-
-
-def current_actor(
-    err_on_no_runtime: bool = True,
-) -> Actor:
-    '''
-    Get the process-local actor instance.
-
-    '''
-    if (
-        err_on_no_runtime
-        and
-        _current_actor is None
-    ):
-        msg: str = 'No local actor has been initialized yet?\n'
-        from ._exceptions import NoRuntime
-
-        if last := last_actor():
-            msg += (
-                f'Apparently the lact active actor was\n'
-                f'|_{last}\n'
-                f'|_{last.uid}\n'
-            )
-        # no actor runtime has (as of yet) ever been started for
-        # this process.
-        else:
-            msg += (
-                # 'No last actor found?\n'
-                '\nDid you forget to call one of,\n'
-                '- `tractor.open_root_actor()`\n'
-                '- `tractor.open_nursery()`\n'
-            )
-
-        raise NoRuntime(msg)
+def current_actor(err_on_no_runtime: bool = True) -> 'Actor':  # type: ignore # noqa
+    """Get the process-local actor instance.
+    """
+    if _current_actor is None and err_on_no_runtime:
+        raise NoRuntime("No local actor has been initialized yet")
 
     return _current_actor
 
 
 def is_main_process() -> bool:
-    '''
-    Bool determining if this actor is running in the top-most process.
-
-    '''
+    """Bool determining if this actor is running in the top-most process.
+    """
     import multiprocessing as mp
     return mp.current_process().name == 'MainProcess'
 
 
 def debug_mode() -> bool:
-    '''
-    Bool determining if "debug mode" is on which enables
+    """Bool determining if "debug mode" is on which enables
     remote subactor pdb entry on crashes.
-
-    '''
+    """
     return bool(_runtime_vars['_debug_mode'])
 
 
 def is_root_process() -> bool:
     return _runtime_vars['_is_root']
-
-
-_ctxvar_Context: ContextVar[Context] = ContextVar(
-    'ipc_context',
-    default=None,
-)
-
-
-def current_ipc_ctx(
-    error_on_not_set: bool = False,
-) -> Context|None:
-    ctx: Context = _ctxvar_Context.get()
-
-    if (
-        not ctx
-        and error_on_not_set
-    ):
-        from ._exceptions import InternalError
-        raise InternalError(
-            'No IPC context has been allocated for this task yet?\n'
-            f'|_{current_task()}\n'
-        )
-    return ctx

tractor/_supervise.py

@@ -21,22 +21,22 @@
 from contextlib import asynccontextmanager as acm
 from functools import partial
 import inspect
-from pprint import pformat
-from typing import TYPE_CHECKING
+from typing import (
+    Optional,
+    TYPE_CHECKING,
+)
 import typing
 import warnings
 
+from exceptiongroup import BaseExceptionGroup
 import trio
 
-from .devx._debug import maybe_wait_for_debugger
+from ._debug import maybe_wait_for_debugger
 from ._state import current_actor, is_main_process
 from .log import get_logger, get_loglevel
 from ._runtime import Actor
 from ._portal import Portal
-from ._exceptions import (
-    is_multi_cancelled,
-    ContextCancelled,
-)
+from ._exceptions import is_multi_cancelled
 from ._root import open_root_actor
 from . import _state
 from . import _spawn
@@ -80,85 +80,54 @@ class ActorNursery:
     '''
     def __init__(
         self,
-        # TODO: maybe def these as fields of a struct looking type?
         actor: Actor,
         ria_nursery: trio.Nursery,
         da_nursery: trio.Nursery,
         errors: dict[tuple[str, str], BaseException],
-
     ) -> None:
         # self.supervisor = supervisor  # TODO
         self._actor: Actor = actor
-
-        # TODO: rename to `._tn` for our conventional "task-nursery"
+        self._ria_nursery = ria_nursery
         self._da_nursery = da_nursery
-
         self._children: dict[
             tuple[str, str],
             tuple[
                 Actor,
                 trio.Process | mp.Process,
-                Portal | None,
+                Optional[Portal],
             ]
         ] = {}
-
+        # portals spawned with ``run_in_actor()`` are
+        # cancelled when their "main" result arrives
+        self._cancel_after_result_on_exit: set = set()
         self.cancelled: bool = False
         self._join_procs = trio.Event()
         self._at_least_one_child_in_debug: bool = False
         self.errors = errors
-        self._scope_error: BaseException|None = None
         self.exited = trio.Event()
 
-        # NOTE: when no explicit call is made to
-        # `.open_root_actor()` by application code,
-        # `.open_nursery()` will implicitly call it to start the
-        # actor-tree runtime. In this case we mark ourselves as
-        # such so that runtime components can be aware for logging
-        # and syncing purposes to any actor opened nurseries.
-        self._implicit_runtime_started: bool = False
-
-        # TODO: remove the `.run_in_actor()` API and thus this 2ndary
-        # nursery when that API get's moved outside this primitive!
-        self._ria_nursery = ria_nursery
-        # portals spawned with ``run_in_actor()`` are
-        # cancelled when their "main" result arrives
-        self._cancel_after_result_on_exit: set = set()
-
     async def start_actor(
         self,
         name: str,
-
         *,
-
-        bind_addrs: list[tuple[str, int]] = [_default_bind_addr],
-        rpc_module_paths: list[str]|None = None,
-        enable_modules: list[str]|None = None,
-        loglevel: str|None = None,  # set log level per subactor
-        debug_mode: bool|None = None,
+        bind_addr: tuple[str, int] = _default_bind_addr,
+        rpc_module_paths: list[str] | None = None,
+        enable_modules: list[str] | None = None,
+        loglevel: str | None = None,  # set log level per subactor
+        nursery: trio.Nursery | None = None,
+        debug_mode: Optional[bool] | None = None,
         infect_asyncio: bool = False,
-
-        # TODO: ideally we can rm this once we no longer have
-        # a `._ria_nursery` since the dependent APIs have been
-        # removed!
-        nursery: trio.Nursery|None = None,
-
     ) -> Portal:
         '''
         Start a (daemon) actor: an process that has no designated
         "main task" besides the runtime.
 
         '''
-        __runtimeframe__: int = 1  # noqa
-        loglevel: str = (
-            loglevel
-            or self._actor.loglevel
-            or get_loglevel()
-        )
+        loglevel = loglevel or self._actor.loglevel or get_loglevel()
 
         # configure and pass runtime state
         _rtv = _state._runtime_vars.copy()
         _rtv['_is_root'] = False
-        _rtv['_is_infected_aio'] = infect_asyncio
 
         # allow setting debug policy per actor
         if debug_mode is not None:
@@ -181,16 +150,14 @@ class ActorNursery:
             # modules allowed to invoked funcs from
             enable_modules=enable_modules,
             loglevel=loglevel,
-
-            # verbatim relay this actor's registrar addresses
-            registry_addrs=current_actor().reg_addrs,
+            arbiter_addr=current_actor()._arb_addr,
         )
         parent_addr = self._actor.accept_addr
         assert parent_addr
 
         # start a task to spawn a process
         # blocks until process has been started and a portal setup
-        nursery: trio.Nursery = nursery or self._da_nursery
+        nursery = nursery or self._da_nursery
 
         # XXX: the type ignore is actually due to a `mypy` bug
         return await nursery.start(  # type: ignore
@@ -200,29 +167,21 @@ class ActorNursery:
                 self,
                 subactor,
                 self.errors,
-                bind_addrs,
+                bind_addr,
                 parent_addr,
                 _rtv,  # run time vars
                 infect_asyncio=infect_asyncio,
             )
         )
 
-    # TODO: DEPRECATE THIS:
-    # -[ ] impl instead as a hilevel wrapper on
-    #   top of a `@context` style invocation.
-    #  |_ dynamic @context decoration on child side
-    #  |_ implicit `Portal.open_context() as (ctx, first):`
-    #    and `return first` on parent side.
-    #  |_ mention how it's similar to `trio-parallel` API?
-    # -[ ] use @api_frame on the wrapper
     async def run_in_actor(
         self,
 
         fn: typing.Callable,
         *,
 
-        name: str | None = None,
-        bind_addrs: tuple[str, int] = [_default_bind_addr],
+        name: Optional[str] = None,
+        bind_addr: tuple[str, int] = _default_bind_addr,
         rpc_module_paths: list[str] | None = None,
         enable_modules: list[str] | None = None,
         loglevel: str | None = None,  # set log level per subactor
@@ -231,28 +190,25 @@ class ActorNursery:
         **kwargs,  # explicit args to ``fn``
 
     ) -> Portal:
-        '''
-        Spawn a new actor, run a lone task, then terminate the actor and
+        """Spawn a new actor, run a lone task, then terminate the actor and
         return its result.
 
         Actors spawned using this method are kept alive at nursery teardown
         until the task spawned by executing ``fn`` completes at which point
         the actor is terminated.
-
-        '''
-        __runtimeframe__: int = 1  # noqa
-        mod_path: str = fn.__module__
+        """
+        mod_path = fn.__module__
 
         if name is None:
             # use the explicit function name if not provided
             name = fn.__name__
 
-        portal: Portal = await self.start_actor(
+        portal = await self.start_actor(
             name,
             enable_modules=[mod_path] + (
                 enable_modules or rpc_module_paths or []
             ),
-            bind_addrs=bind_addrs,
+            bind_addr=bind_addr,
             loglevel=loglevel,
             # use the run_in_actor nursery
             nursery=self._ria_nursery,
@@ -276,42 +232,21 @@ class ActorNursery:
         )
         return portal
 
-    # @api_frame
-    async def cancel(
-        self,
-        hard_kill: bool = False,
+    async def cancel(self, hard_kill: bool = False) -> None:
+        """Cancel this nursery by instructing each subactor to cancel
+        itself and wait for all subactors to terminate.
 
-    ) -> None:
-        '''
-        Cancel this actor-nursery by instructing each subactor's
-        runtime to cancel and wait for all underlying sub-processes
-        to terminate.
-
-        If `hard_kill` is set then kill the processes directly using
-        the spawning-backend's API/OS-machinery without any attempt
-        at (graceful) `trio`-style cancellation using our
-        `Actor.cancel()`.
-
-        '''
-        __runtimeframe__: int = 1  # noqa
+        If ``hard_killl`` is set to ``True`` then kill the processes
+        directly without any far end graceful ``trio`` cancellation.
+        """
         self.cancelled = True
 
-        # TODO: impl a repr for spawn more compact
-        # then `._children`..
-        children: dict = self._children
-        child_count: int = len(children)
-        msg: str = f'Cancelling actor nursery with {child_count} children\n'
+        log.cancel(f"Cancelling nursery in {self._actor.uid}")
         with trio.move_on_after(3) as cs:
-            async with trio.open_nursery() as tn:
 
-                subactor: Actor
-                proc: trio.Process
-                portal: Portal
-                for (
-                    subactor,
-                    proc,
-                    portal,
-                ) in children.values():
+            async with trio.open_nursery() as nursery:
+
+                for subactor, proc, portal in self._children.values():
 
                     # TODO: are we ever even going to use this or
                     # is the spawning backend responsible for such
@@ -323,13 +258,12 @@ class ActorNursery:
                         if portal is None:  # actor hasn't fully spawned yet
                             event = self._actor._peer_connected[subactor.uid]
                             log.warning(
-                                f"{subactor.uid} never 't finished spawning?"
-                            )
+                                f"{subactor.uid} wasn't finished spawning?")
 
                             await event.wait()
 
                             # channel/portal should now be up
-                            _, _, portal = children[subactor.uid]
+                            _, _, portal = self._children[subactor.uid]
 
                             # XXX should be impossible to get here
                             # unless method was called from within
@@ -346,24 +280,14 @@ class ActorNursery:
                         # spawn cancel tasks for each sub-actor
                         assert portal
                         if portal.channel.connected():
-                            tn.start_soon(portal.cancel_actor)
+                            nursery.start_soon(portal.cancel_actor)
 
-                log.cancel(msg)
         # if we cancelled the cancel (we hung cancelling remote actors)
         # then hard kill all sub-processes
         if cs.cancelled_caught:
             log.error(
-                f'Failed to cancel {self}?\n'
-                'Hard killing underlying subprocess tree!\n'
-            )
-            subactor: Actor
-            proc: trio.Process
-            portal: Portal
-            for (
-                subactor,
-                proc,
-                portal,
-            ) in children.values():
+                f"Failed to cancel {self}\nHard killing process tree!")
+            for subactor, proc, portal in self._children.values():
                 log.warning(f"Hard killing process {proc}")
                 proc.terminate()
 
@@ -374,15 +298,11 @@ class ActorNursery:
 @acm
 async def _open_and_supervise_one_cancels_all_nursery(
     actor: Actor,
-    tb_hide: bool = False,
 
 ) -> typing.AsyncGenerator[ActorNursery, None]:
 
-    # normally don't need to show user by default
-    __tracebackhide__: bool = tb_hide
-
-    outer_err: BaseException|None = None
-    inner_err: BaseException|None = None
+    # TODO: yay or nay?
+    __tracebackhide__ = True
 
     # the collection of errors retreived from spawned sub-actors
     errors: dict[tuple[str, str], BaseException] = {}
@@ -392,7 +312,7 @@ async def _open_and_supervise_one_cancels_all_nursery(
     # handling errors that are generated by the inner nursery in
     # a supervisor strategy **before** blocking indefinitely to wait for
     # actors spawned in "daemon mode" (aka started using
-    # `ActorNursery.start_actor()`).
+    # ``ActorNursery.start_actor()``).
 
     # errors from this daemon actor nursery bubble up to caller
     async with trio.open_nursery() as da_nursery:
@@ -407,7 +327,7 @@ async def _open_and_supervise_one_cancels_all_nursery(
             # the above "daemon actor" nursery will be notified.
             async with trio.open_nursery() as ria_nursery:
 
-                an = ActorNursery(
+                anursery = ActorNursery(
                     actor,
                     ria_nursery,
                     da_nursery,
@@ -416,19 +336,18 @@ async def _open_and_supervise_one_cancels_all_nursery(
                 try:
                     # spawning of actors happens in the caller's scope
                     # after we yield upwards
-                    yield an
+                    yield anursery
 
                     # When we didn't error in the caller's scope,
                     # signal all process-monitor-tasks to conduct
                     # the "hard join phase".
                     log.runtime(
-                        'Waiting on subactors to complete:\n'
-                        f'{pformat(an._children)}\n'
+                        f"Waiting on subactors {anursery._children} "
+                        "to complete"
                     )
-                    an._join_procs.set()
+                    anursery._join_procs.set()
 
-                except BaseException as _inner_err:
-                    inner_err = _inner_err
+                except BaseException as inner_err:
                     errors[actor.uid] = inner_err
 
                     # If we error in the root but the debugger is
@@ -438,60 +357,37 @@ async def _open_and_supervise_one_cancels_all_nursery(
                     # Instead try to wait for pdb to be released before
                     # tearing down.
                     await maybe_wait_for_debugger(
-                        child_in_debug=an._at_least_one_child_in_debug
+                        child_in_debug=anursery._at_least_one_child_in_debug
                     )
 
                     # if the caller's scope errored then we activate our
                     # one-cancels-all supervisor strategy (don't
                     # worry more are coming).
-                    an._join_procs.set()
+                    anursery._join_procs.set()
 
-                    # XXX NOTE XXX: hypothetically an error could
-                    # be raised and then a cancel signal shows up
+                    # XXX: hypothetically an error could be
+                    # raised and then a cancel signal shows up
                     # slightly after in which case the `else:`
                     # block here might not complete?  For now,
                     # shield both.
                     with trio.CancelScope(shield=True):
-                        etype: type = type(inner_err)
+                        etype = type(inner_err)
                         if etype in (
                             trio.Cancelled,
-                            KeyboardInterrupt,
+                            KeyboardInterrupt
                         ) or (
                             is_multi_cancelled(inner_err)
                         ):
                             log.cancel(
-                                f'Actor-nursery cancelled by {etype}\n\n'
-
-                                f'{current_actor().uid}\n'
-                                f' |_{an}\n\n'
-
-                                # TODO: show tb str?
-                                # f'{tb_str}'
-                            )
-                        elif etype in {
-                            ContextCancelled,
-                        }:
-                            log.cancel(
-                                'Actor-nursery caught remote cancellation\n\n'
-
-                                f'{inner_err.tb_str}'
-                            )
+                                f"Nursery for {current_actor().uid} "
+                                f"was cancelled with {etype}")
                         else:
                             log.exception(
-                                'Nursery errored with:\n'
-
-                                # TODO: same thing as in
-                                # `._invoke()` to compute how to
-                                # place this div-line in the
-                                # middle of the above msg
-                                # content..
-                                # -[ ] prolly helper-func it too
-                                #   in our `.log` module..
-                                # '------ - ------'
-                            )
+                                f"Nursery for {current_actor().uid} "
+                                f"errored with")
 
                         # cancel all subactors
-                        await an.cancel()
+                        await anursery.cancel()
 
             # ria_nursery scope end
 
@@ -506,30 +402,24 @@ async def _open_and_supervise_one_cancels_all_nursery(
             Exception,
             BaseExceptionGroup,
             trio.Cancelled
-        ) as _outer_err:
-            outer_err = _outer_err
 
-            an._scope_error = outer_err or inner_err
+        ) as err:
 
             # XXX: yet another guard before allowing the cancel
             # sequence in case a (single) child is in debug.
             await maybe_wait_for_debugger(
-                child_in_debug=an._at_least_one_child_in_debug
+                child_in_debug=anursery._at_least_one_child_in_debug
             )
 
             # If actor-local error was raised while waiting on
             # ".run_in_actor()" actors then we also want to cancel all
             # remaining sub-actors (due to our lone strategy:
             # one-cancels-all).
-            if an._children:
-                log.cancel(
-                    'Actor-nursery cancelling due error type:\n'
-                    f'{outer_err}\n'
-                )
+            log.cancel(f"Nursery cancelling due to {err}")
+            if anursery._children:
                 with trio.CancelScope(shield=True):
-                    await an.cancel()
+                    await anursery.cancel()
             raise
-
         finally:
             # No errors were raised while awaiting ".run_in_actor()"
             # actors but those actors may have returned remote errors as
@@ -538,9 +428,9 @@ async def _open_and_supervise_one_cancels_all_nursery(
             # collected in ``errors`` so cancel all actors, summarize
             # all errors and re-raise.
             if errors:
-                if an._children:
+                if anursery._children:
                     with trio.CancelScope(shield=True):
-                        await an.cancel()
+                        await anursery.cancel()
 
                 # use `BaseExceptionGroup` as needed
                 if len(errors) > 1:
@@ -551,19 +441,11 @@ async def _open_and_supervise_one_cancels_all_nursery(
                 else:
                     raise list(errors.values())[0]
 
-            # show frame on any (likely) internal error
-            if (
-                not an.cancelled
-                and an._scope_error
-            ):
-                __tracebackhide__: bool = False
-
         # da_nursery scope end - nursery checkpoint
     # final exit
 
 
 @acm
-# @api_frame
 async def open_nursery(
     **kwargs,
 
@@ -583,21 +465,19 @@ async def open_nursery(
     which cancellation scopes correspond to each spawned subactor set.
 
     '''
-    __tracebackhide__: bool = True
-    implicit_runtime: bool = False
-    actor: Actor = current_actor(err_on_no_runtime=False)
-    an: ActorNursery|None = None
+    implicit_runtime = False
+
+    actor = current_actor(err_on_no_runtime=False)
+
     try:
-        if (
-            actor is None
-            and is_main_process()
-        ):
+        if actor is None and is_main_process():
+
             # if we are the parent process start the
             # actor runtime implicitly
             log.info("Starting actor runtime!")
 
             # mark us for teardown on exit
-            implicit_runtime: bool = True
+            implicit_runtime = True
 
             async with open_root_actor(**kwargs) as actor:
                 assert actor is current_actor()
@@ -605,54 +485,24 @@ async def open_nursery(
                 try:
                     async with _open_and_supervise_one_cancels_all_nursery(
                         actor
-                    ) as an:
-
-                        # NOTE: mark this nursery as having
-                        # implicitly started the root actor so
-                        # that `._runtime` machinery can avoid
-                        # certain teardown synchronization
-                        # blocking/waits and any associated (warn)
-                        # logging when it's known that this
-                        # nursery shouldn't be exited before the
-                        # root actor is.
-                        an._implicit_runtime_started = True
-                        yield an
+                    ) as anursery:
+                        yield anursery
                 finally:
-                    # XXX: this event will be set after the root actor
-                    # runtime is already torn down, so we want to
-                    # avoid any blocking on it.
-                    an.exited.set()
+                    anursery.exited.set()
 
         else:  # sub-nursery case
 
             try:
                 async with _open_and_supervise_one_cancels_all_nursery(
                     actor
-                ) as an:
-                    yield an
+                ) as anursery:
+                    yield anursery
             finally:
-                an.exited.set()
+                anursery.exited.set()
 
     finally:
-        # show frame on any internal runtime-scope error
-        if (
-            an
-            and not an.cancelled
-            and an._scope_error
-        ):
-            __tracebackhide__: bool = False
-
-        msg: str = (
-            'Actor-nursery exited\n'
-            f'|_{an}\n'
-        )
+        log.debug("Nursery teardown complete")
 
+        # shutdown runtime if it was started
         if implicit_runtime:
-            # shutdown runtime if it was started and report noisly
-            # that we're did so.
-            msg += '=> Shutting down actor runtime <=\n'
-            log.info(msg)
-
-        else:
-            # keep noise low during std operation.
-            log.runtime(msg)
+            log.info("Shutting down actor tree")

tractor/_testing/__init__.py

@@ -1,96 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-'''
-Various helpers/utils for auditing your `tractor` app and/or the
-core runtime.
-
-'''
-from contextlib import asynccontextmanager as acm
-import pathlib
-
-import tractor
-from .pytest import (
-    tractor_test as tractor_test
-)
-from .fault_simulation import (
-    break_ipc as break_ipc,
-)
-
-
-def repodir() -> pathlib.Path:
-    '''
-    Return the abspath to the repo directory.
-
-    '''
-    # 2 parents up to step up through tests/<repo_dir>
-    return pathlib.Path(
-        __file__
-
-    # 3 .parents bc:
-    # <._testing-pkg>.<tractor-pkg>.<git-repo-dir>
-    # /$HOME/../<tractor-repo-dir>/tractor/_testing/__init__.py
-    ).parent.parent.parent.absolute()
-
-
-def examples_dir() -> pathlib.Path:
-    '''
-    Return the abspath to the examples directory as `pathlib.Path`.
-
-    '''
-    return repodir() / 'examples'
-
-
-def mk_cmd(
-    ex_name: str,
-    exs_subpath: str = 'debugging',
-) -> str:
-    '''
-    Generate a shell command suitable to pass to ``pexpect.spawn()``.
-
-    '''
-    script_path: pathlib.Path = (
-        examples_dir()
-        / exs_subpath
-        / f'{ex_name}.py'
-    )
-    return ' '.join([
-        'python',
-        str(script_path)
-    ])
-
-
-@acm
-async def expect_ctxc(
-    yay: bool,
-    reraise: bool = False,
-) -> None:
-    '''
-    Small acm to catch `ContextCancelled` errors when expected
-    below it in a `async with ()` block.
-
-    '''
-    if yay:
-        try:
-            yield
-            raise RuntimeError('Never raised ctxc?')
-        except tractor.ContextCancelled:
-            if reraise:
-                raise
-            else:
-                return
-    else:
-        yield

tractor/_testing/fault_simulation.py

@@ -1,92 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-'''
-`pytest` utils helpers and plugins for testing `tractor`'s runtime
-and applications.
-
-'''
-
-from tractor import (
-    MsgStream,
-)
-
-async def break_ipc(
-    stream: MsgStream,
-    method: str|None = None,
-    pre_close: bool = False,
-
-    def_method: str = 'socket_close',
-
-) -> None:
-    '''
-    XXX: close the channel right after an error is raised
-    purposely breaking the IPC transport to make sure the parent
-    doesn't get stuck in debug or hang on the connection join.
-    this more or less simulates an infinite msg-receive hang on
-    the other end.
-
-    '''
-    # close channel via IPC prot msging before
-    # any transport breakage
-    if pre_close:
-        await stream.aclose()
-
-    method: str = method or def_method
-    print(
-        '#################################\n'
-        'Simulating CHILD-side IPC BREAK!\n'
-        f'method: {method}\n'
-        f'pre `.aclose()`: {pre_close}\n'
-        '#################################\n'
-    )
-
-    match method:
-        case 'socket_close':
-            await stream._ctx.chan.transport.stream.aclose()
-
-        case 'socket_eof':
-            # NOTE: `trio` does the following underneath this
-            # call in `src/trio/_highlevel_socket.py`:
-            # `Stream.socket.shutdown(tsocket.SHUT_WR)`
-            await stream._ctx.chan.transport.stream.send_eof()
-
-        # TODO: remove since now this will be invalid with our
-        # new typed msg spec?
-        # case 'msg':
-        #     await stream._ctx.chan.send(None)
-
-        # TODO: the actual real-world simulated cases like
-        # transport layer hangs and/or lower layer 2-gens type
-        # scenarios..
-        #
-        # -[ ] already have some issues for this general testing
-        # area:
-        #  - https://github.com/goodboy/tractor/issues/97
-        #  - https://github.com/goodboy/tractor/issues/124
-        #   - PR from @guille:
-        #     https://github.com/goodboy/tractor/pull/149
-        # case 'hang':
-        # TODO: framework research:
-        #
-        # - https://github.com/GuoTengda1993/pynetem
-        # - https://github.com/shopify/toxiproxy
-        # - https://manpages.ubuntu.com/manpages/trusty/man1/wirefilter.1.html
-
-        case _:
-            raise RuntimeError(
-                f'IPC break method unsupported: {method}'
-            )

tractor/_testing/pytest.py

@@ -1,113 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-'''
-`pytest` utils helpers and plugins for testing `tractor`'s runtime
-and applications.
-
-'''
-from functools import (
-    partial,
-    wraps,
-)
-import inspect
-import platform
-
-import tractor
-import trio
-
-
-def tractor_test(fn):
-    '''
-    Decorator for async test funcs to present them as "native"
-    looking sync funcs runnable by `pytest` using `trio.run()`.
-
-    Use:
-
-    @tractor_test
-    async def test_whatever():
-        await ...
-
-    If fixtures:
-
-        - ``reg_addr`` (a socket addr tuple where arbiter is listening)
-        - ``loglevel`` (logging level passed to tractor internals)
-        - ``start_method`` (subprocess spawning backend)
-
-    are defined in the `pytest` fixture space they will be automatically
-    injected to tests declaring these funcargs.
-    '''
-    @wraps(fn)
-    def wrapper(
-        *args,
-        loglevel=None,
-        reg_addr=None,
-        start_method: str|None = None,
-        debug_mode: bool = False,
-        **kwargs
-    ):
-        # __tracebackhide__ = True
-
-        # NOTE: inject ant test func declared fixture
-        # names by manually checking!
-        if 'reg_addr' in inspect.signature(fn).parameters:
-            # injects test suite fixture value to test as well
-            # as `run()`
-            kwargs['reg_addr'] = reg_addr
-
-        if 'loglevel' in inspect.signature(fn).parameters:
-            # allows test suites to define a 'loglevel' fixture
-            # that activates the internal logging
-            kwargs['loglevel'] = loglevel
-
-        if start_method is None:
-            if platform.system() == "Windows":
-                start_method = 'trio'
-
-        if 'start_method' in inspect.signature(fn).parameters:
-            # set of subprocess spawning backends
-            kwargs['start_method'] = start_method
-
-        if 'debug_mode' in inspect.signature(fn).parameters:
-            # set of subprocess spawning backends
-            kwargs['debug_mode'] = debug_mode
-
-
-        if kwargs:
-
-            # use explicit root actor start
-            async def _main():
-                async with tractor.open_root_actor(
-                    # **kwargs,
-                    registry_addrs=[reg_addr] if reg_addr else None,
-                    loglevel=loglevel,
-                    start_method=start_method,
-
-                    # TODO: only enable when pytest is passed --pdb
-                    debug_mode=debug_mode,
-
-                ):
-                    await fn(*args, **kwargs)
-
-            main = _main
-
-        else:
-            # use implicit root actor start
-            main = partial(fn, *args, **kwargs)
-
-        return trio.run(main)
-
-    return wrapper

tractor/devx/__init__.py

@@ -1,43 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-"""
-Runtime "developer experience" utils and addons to aid our
-(advanced) users and core devs in building distributed applications
-and working with/on the actor runtime.
-
-"""
-from ._debug import (
-    maybe_wait_for_debugger as maybe_wait_for_debugger,
-    acquire_debug_lock as acquire_debug_lock,
-    breakpoint as breakpoint,
-    pause as pause,
-    pause_from_sync as pause_from_sync,
-    sigint_shield as sigint_shield,
-    open_crash_handler as open_crash_handler,
-    maybe_open_crash_handler as maybe_open_crash_handler,
-    maybe_init_greenback as maybe_init_greenback,
-    post_mortem as post_mortem,
-    mk_pdb as mk_pdb,
-)
-from ._stackscope import (
-    enable_stack_on_sig as enable_stack_on_sig,
-)
-from .pformat import (
-    add_div as add_div,
-    pformat_caller_frame as pformat_caller_frame,
-    pformat_boxed_tb as pformat_boxed_tb,
-)

tractor/devx/_frame_stack.py

@@ -1,288 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-'''
-Tools for code-object annotation, introspection and mutation
-as it pertains to improving the grok-ability of our runtime!
-
-'''
-from __future__ import annotations
-from functools import partial
-import inspect
-from types import (
-    FrameType,
-    FunctionType,
-    MethodType,
-    # CodeType,
-)
-from typing import (
-    Any,
-    Callable,
-    Type,
-)
-
-from tractor.msg import (
-    pretty_struct,
-    NamespacePath,
-)
-import wrapt
-
-
-# TODO: yeah, i don't love this and we should prolly just
-# write a decorator that actually keeps a stupid ref to the func
-# obj..
-def get_class_from_frame(fr: FrameType) -> (
-    FunctionType
-    |MethodType
-):
-    '''
-    Attempt to get the function (or method) reference
-    from a given `FrameType`.
-
-    Verbatim from an SO:
-    https://stackoverflow.com/a/2220759
-
-    '''
-    args, _, _, value_dict = inspect.getargvalues(fr)
-
-    # we check the first parameter for the frame function is
-    # named 'self'
-    if (
-        len(args)
-        and
-        # TODO: other cases for `@classmethod` etc..?)
-        args[0] == 'self'
-    ):
-        # in that case, 'self' will be referenced in value_dict
-        instance: object = value_dict.get('self')
-        if instance:
-          # return its class
-          return getattr(
-              instance,
-              '__class__',
-              None,
-          )
-
-    # return None otherwise
-    return None
-
-
-def get_ns_and_func_from_frame(
-    frame: FrameType,
-) -> Callable:
-    '''
-    Return the corresponding function object reference from
-    a `FrameType`, and return it and it's parent namespace `dict`.
-
-    '''
-    ns: dict[str, Any]
-
-    # for a method, go up a frame and lookup the name in locals()
-    if '.' in (qualname := frame.f_code.co_qualname):
-        cls_name, _, func_name = qualname.partition('.')
-        ns = frame.f_back.f_locals[cls_name].__dict__
-
-    else:
-        func_name: str = frame.f_code.co_name
-        ns = frame.f_globals
-
-    return (
-        ns,
-        ns[func_name],
-    )
-
-
-def func_ref_from_frame(
-    frame: FrameType,
-) -> Callable:
-    func_name: str = frame.f_code.co_name
-    try:
-        return frame.f_globals[func_name]
-    except KeyError:
-        cls: Type|None = get_class_from_frame(frame)
-        if cls:
-            return getattr(
-                cls,
-                func_name,
-            )
-
-
-class CallerInfo(pretty_struct.Struct):
-    # https://docs.python.org/dev/reference/datamodel.html#frame-objects
-    # https://docs.python.org/dev/library/inspect.html#the-interpreter-stack
-    _api_frame: FrameType
-
-    @property
-    def api_frame(self) -> FrameType:
-        try:
-            self._api_frame.clear()
-        except RuntimeError:
-            # log.warning(
-            print(
-                f'Frame {self._api_frame} for {self.api_func} is still active!'
-            )
-
-        return self._api_frame
-
-    _api_func: Callable
-
-    @property
-    def api_func(self) -> Callable:
-        return self._api_func
-
-    _caller_frames_up: int|None = 1
-    _caller_frame: FrameType|None = None  # cached after first stack scan
-
-    @property
-    def api_nsp(self) -> NamespacePath|None:
-        func: FunctionType = self.api_func
-        if func:
-            return NamespacePath.from_ref(func)
-
-        return '<unknown>'
-
-    @property
-    def caller_frame(self) -> FrameType:
-
-        # if not already cached, scan up stack explicitly by
-        # configured count.
-        if not self._caller_frame:
-            if self._caller_frames_up:
-                for _ in range(self._caller_frames_up):
-                    caller_frame: FrameType|None = self.api_frame.f_back
-
-                if not caller_frame:
-                    raise ValueError(
-                        'No frame exists {self._caller_frames_up} up from\n'
-                        f'{self.api_frame} @ {self.api_nsp}\n'
-                    )
-
-            self._caller_frame = caller_frame
-
-        return self._caller_frame
-
-    @property
-    def caller_nsp(self) -> NamespacePath|None:
-        func: FunctionType = self.api_func
-        if func:
-            return NamespacePath.from_ref(func)
-
-        return '<unknown>'
-
-
-def find_caller_info(
-    dunder_var: str = '__runtimeframe__',
-    iframes:int = 1,
-    check_frame_depth: bool = True,
-
-) -> CallerInfo|None:
-    '''
-    Scan up the callstack for a frame with a `dunder_var: str` variable
-    and return the `iframes` frames above it.
-
-    By default we scan for a `__runtimeframe__` scope var which
-    denotes a `tractor` API above which (one frame up) is "user
-    app code" which "called into" the `tractor` method or func.
-
-    TODO: ex with `Portal.open_context()`
-
-    '''
-    # TODO: use this instead?
-    # https://docs.python.org/3/library/inspect.html#inspect.getouterframes
-    frames: list[inspect.FrameInfo] = inspect.stack()
-    for fi in frames:
-        assert (
-            fi.function
-            ==
-            fi.frame.f_code.co_name
-        )
-        this_frame: FrameType = fi.frame
-        dunder_val: int|None = this_frame.f_locals.get(dunder_var)
-        if dunder_val:
-            go_up_iframes: int = (
-                dunder_val  # could be 0 or `True` i guess?
-                or
-                iframes
-            )
-            rt_frame: FrameType = fi.frame
-            call_frame = rt_frame
-            for i in range(go_up_iframes):
-                call_frame = call_frame.f_back
-
-            return CallerInfo(
-                _api_frame=rt_frame,
-                _api_func=func_ref_from_frame(rt_frame),
-                _caller_frames_up=go_up_iframes,
-            )
-
-    return None
-
-
-_frame2callerinfo_cache: dict[FrameType, CallerInfo] = {}
-
-
-# TODO: -[x] move all this into new `.devx._code`!
-# -[ ] consider rename to _callstack?
-# -[ ] prolly create a `@runtime_api` dec?
-#   |_ @api_frame seems better?
-# -[ ] ^- make it capture and/or accept buncha optional
-#     meta-data like a fancier version of `@pdbp.hideframe`.
-#
-def api_frame(
-    wrapped: Callable|None = None,
-    *,
-    caller_frames_up: int = 1,
-
-) -> Callable:
-
-    # handle the decorator called WITHOUT () case,
-    # i.e. just @api_frame, NOT @api_frame(extra=<blah>)
-    if wrapped is None:
-        return partial(
-            api_frame,
-            caller_frames_up=caller_frames_up,
-        )
-
-    @wrapt.decorator
-    async def wrapper(
-        wrapped: Callable,
-        instance: object,
-        args: tuple,
-        kwargs: dict,
-    ):
-        # maybe cache the API frame for this call
-        global _frame2callerinfo_cache
-        this_frame: FrameType = inspect.currentframe()
-        api_frame: FrameType = this_frame.f_back
-
-        if not _frame2callerinfo_cache.get(api_frame):
-            _frame2callerinfo_cache[api_frame] = CallerInfo(
-                _api_frame=api_frame,
-                _api_func=wrapped,
-                _caller_frames_up=caller_frames_up,
-            )
-
-        return wrapped(*args, **kwargs)
-
-    # annotate the function as a "api function", meaning it is
-    # a function for which the function above it in the call stack should be
-    # non-`tractor` code aka "user code".
-    #
-    # in the global frame cache for easy lookup from a given
-    # func-instance
-    wrapped._call_infos: dict[FrameType, CallerInfo] = _frame2callerinfo_cache
-    wrapped.__api_func__: bool = True
-    return wrapper(wrapped)

tractor/devx/_stackscope.py

@@ -1,239 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-'''
-The fundamental cross process SC abstraction: an inter-actor,
-cancel-scope linked task "context".
-
-A ``Context`` is very similar to the ``trio.Nursery.cancel_scope`` built
-into each ``trio.Nursery`` except it links the lifetimes of memory space
-disjoint, parallel executing tasks in separate actors.
-
-'''
-from __future__ import annotations
-# from functools import partial
-from threading import (
-    current_thread,
-    Thread,
-    RLock,
-)
-import multiprocessing as mp
-from signal import (
-    signal,
-    getsignal,
-    SIGUSR1,
-)
-# import traceback
-from types import ModuleType
-from typing import (
-    Callable,
-    TYPE_CHECKING,
-)
-
-import trio
-from tractor import (
-    _state,
-    log as logmod,
-)
-
-log = logmod.get_logger(__name__)
-
-
-if TYPE_CHECKING:
-    from tractor._spawn import ProcessType
-    from tractor import (
-        Actor,
-        ActorNursery,
-    )
-
-
-@trio.lowlevel.disable_ki_protection
-def dump_task_tree() -> None:
-    '''
-    Do a classic `stackscope.extract()` task-tree dump to console at
-    `.devx()` level.
-
-    '''
-    import stackscope
-    tree_str: str = str(
-        stackscope.extract(
-            trio.lowlevel.current_root_task(),
-            recurse_child_tasks=True
-        )
-    )
-    actor: Actor = _state.current_actor()
-    thr: Thread = current_thread()
-    log.devx(
-        f'Dumping `stackscope` tree for actor\n'
-        f'{actor.uid}:\n'
-        f'|_{mp.current_process()}\n'
-        f'  |_{thr}\n'
-        f'    |_{actor}\n\n'
-
-        # start-of-trace-tree delimiter (mostly for testing)
-        '------ - ------\n'
-        '\n'
-        +
-        f'{tree_str}\n'
-        +
-        # end-of-trace-tree delimiter (mostly for testing)
-        f'\n'
-        f'------ {actor.uid!r} ------\n'
-    )
-    # TODO: can remove this right?
-    # -[ ] was original code from author
-    #
-    # print(
-    #     'DUMPING FROM PRINT\n'
-    #     +
-    #     content
-    # )
-    # import logging
-    # try:
-    #     with open("/dev/tty", "w") as tty:
-    #         tty.write(tree_str)
-    # except BaseException:
-    #     logging.getLogger(
-    #         "task_tree"
-    #     ).exception("Error printing task tree")
-
-_handler_lock = RLock()
-_tree_dumped: bool = False
-
-
-def dump_tree_on_sig(
-    sig: int,
-    frame: object,
-
-    relay_to_subs: bool = True,
-
-) -> None:
-    global _tree_dumped, _handler_lock
-    with _handler_lock:
-        if _tree_dumped:
-            log.warning(
-                'Already dumped for this actor...??'
-            )
-            return
-
-        _tree_dumped = True
-
-        # actor: Actor = _state.current_actor()
-        log.devx(
-            'Trying to dump `stackscope` tree..\n'
-        )
-        try:
-            dump_task_tree()
-            # await actor._service_n.start_soon(
-            #     partial(
-            #         trio.to_thread.run_sync,
-            #         dump_task_tree,
-            #     )
-            # )
-            # trio.lowlevel.current_trio_token().run_sync_soon(
-            #     dump_task_tree
-            # )
-
-        except RuntimeError:
-            log.exception(
-                'Failed to dump `stackscope` tree..\n'
-            )
-            # not in async context -- print a normal traceback
-            # traceback.print_stack()
-            raise
-
-        except BaseException:
-            log.exception(
-                'Failed to dump `stackscope` tree..\n'
-            )
-            raise
-
-        log.devx(
-            'Supposedly we dumped just fine..?'
-        )
-
-    if not relay_to_subs:
-        return
-
-    an: ActorNursery
-    for an in _state.current_actor()._actoruid2nursery.values():
-        subproc: ProcessType
-        subactor: Actor
-        for subactor, subproc, _ in an._children.values():
-            log.warning(
-                f'Relaying `SIGUSR1`[{sig}] to sub-actor\n'
-                f'{subactor}\n'
-                f' |_{subproc}\n'
-            )
-
-            # bc of course stdlib can't have a std API.. XD
-            match subproc:
-                case trio.Process():
-                    subproc.send_signal(sig)
-
-                case mp.Process():
-                    subproc._send_signal(sig)
-
-
-def enable_stack_on_sig(
-    sig: int = SIGUSR1,
-) -> ModuleType:
-    '''
-    Enable `stackscope` tracing on reception of a signal; by
-    default this is SIGUSR1.
-
-    HOT TIP: a task/ctx-tree dump can be triggered from a shell with
-    fancy cmds.
-
-    For ex. from `bash` using `pgrep` and cmd-sustitution
-    (https://www.gnu.org/software/bash/manual/bash.html#Command-Substitution)
-    you could use:
-
-    >> kill -SIGUSR1 $(pgrep -f '<cmd>')
-
-    Or with with `xonsh` (which has diff capture-from-subproc syntax)
-
-    >> kill -SIGUSR1 @$(pgrep -f '<cmd>')
-
-    '''
-    try:
-        import stackscope
-    except ImportError:
-        log.warning(
-            '`stackscope` not installed for use in debug mode!'
-        )
-        return None
-
-    handler: Callable|int = getsignal(sig)
-    if handler is dump_tree_on_sig:
-        log.devx(
-            'A `SIGUSR1` handler already exists?\n'
-            f'|_ {handler!r}\n'
-        )
-        return
-
-    signal(
-        sig,
-        dump_tree_on_sig,
-    )
-    log.devx(
-        'Enabling trace-trees on `SIGUSR1` '
-        'since `stackscope` is installed @ \n'
-        f'{stackscope!r}\n\n'
-        f'With `SIGUSR1` handler\n'
-        f'|_{dump_tree_on_sig}\n'
-    )
-    return stackscope

tractor/devx/cli.py

@@ -1,129 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-"""
-CLI framework extensions for hacking on the actor runtime.
-
-Currently popular frameworks supported are:
-
-  - `typer` via the `@callback` API
-
-"""
-from __future__ import annotations
-from typing import (
-    Any,
-    Callable,
-)
-from typing_extensions import Annotated
-
-import typer
-
-
-_runtime_vars: dict[str, Any] = {}
-
-
-def load_runtime_vars(
-    ctx: typer.Context,
-    callback: Callable,
-    pdb: bool = False,  # --pdb
-    ll: Annotated[
-        str,
-        typer.Option(
-            '--loglevel',
-            '-l',
-            help='BigD logging level',
-        ),
-    ] = 'cancel',  # -l info
-):
-    '''
-    Maybe engage crash handling with `pdbp` when code inside
-    a `typer` CLI endpoint cmd raises.
-
-    To use this callback simply take your `app = typer.Typer()` instance
-    and decorate this function with it like so:
-
-    .. code:: python
-
-        from tractor.devx import cli
-
-        app = typer.Typer()
-
-        # manual decoration to hook into `click`'s context system!
-        cli.load_runtime_vars = app.callback(
-            invoke_without_command=True,
-        )
-
-    And then you can use the now augmented `click` CLI context as so,
-
-    .. code:: python
-
-        @app.command(
-            context_settings={
-                "allow_extra_args": True,
-                "ignore_unknown_options": True,
-            }
-        )
-        def my_cli_cmd(
-            ctx: typer.Context,
-        ):
-            rtvars: dict = ctx.runtime_vars
-            pdb: bool = rtvars['pdb']
-
-            with tractor.devx.cli.maybe_open_crash_handler(pdb=pdb):
-                trio.run(
-                    partial(
-                        my_tractor_main_task_func,
-                        debug_mode=pdb,
-                        loglevel=rtvars['ll'],
-                    )
-                )
-
-    which will enable log level and debug mode globally for the entire
-    `tractor` + `trio` runtime thereafter!
-
-    Bo
-
-    '''
-    global _runtime_vars
-    _runtime_vars |= {
-        'pdb': pdb,
-        'll': ll,
-    }
-
-    ctx.runtime_vars: dict[str, Any] = _runtime_vars
-    print(
-        f'`typer` sub-cmd: {ctx.invoked_subcommand}\n'
-        f'`tractor` runtime vars: {_runtime_vars}'
-    )
-
-    # XXX NOTE XXX: hackzone.. if no sub-cmd is specified (the
-    # default if the user just invokes `bigd`) then we simply
-    # invoke the sole `_bigd()` cmd passing in the "parent"
-    # typer.Context directly to that call since we're treating it
-    # as a "non sub-command" or wtv..
-    # TODO: ideally typer would have some kinda built-in way to get
-    # this behaviour without having to construct and manually
-    # invoke our own cmd..
-    if (
-        ctx.invoked_subcommand is None
-        or ctx.invoked_subcommand == callback.__name__
-    ):
-        cmd: typer.core.TyperCommand = typer.core.TyperCommand(
-            name='bigd',
-            callback=callback,
-        )
-        ctx.params = {'ctx': ctx}
-        cmd.invoke(ctx)

tractor/devx/pformat.py

@@ -1,168 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-'''
-Pretty formatters for use throughout the code base.
-Mostly handy for logging and exception message content.
-
-'''
-import textwrap
-import traceback
-
-from trio import CancelScope
-
-
-def add_div(
-    message: str,
-    div_str: str = '------ - ------',
-
-) -> str:
-    '''
-    Add a "divider string" to the input `message` with
-    a little math to center it underneath.
-
-    '''
-    div_offset: int = (
-        round(len(message)/2)+1
-        -
-        round(len(div_str)/2)+1
-    )
-    div_str: str = (
-        '\n' + ' '*div_offset + f'{div_str}\n'
-    )
-    return div_str
-
-
-def pformat_boxed_tb(
-    tb_str: str,
-    fields_str: str|None = None,
-    field_prefix: str = ' |_',
-
-    tb_box_indent: int|None = None,
-    tb_body_indent: int = 1,
-
-) -> str:
-    '''
-    Create a "boxed" looking traceback string.
-
-    Useful for emphasizing traceback text content as being an
-    embedded attribute of some other object (like
-    a `RemoteActorError` or other boxing remote error shuttle
-    container).
-
-    Any other parent/container "fields" can be passed in the
-    `fields_str` input along with other prefix/indent settings.
-
-    '''
-    if (
-        fields_str
-        and
-        field_prefix
-    ):
-        fields: str = textwrap.indent(
-            fields_str,
-            prefix=field_prefix,
-        )
-    else:
-        fields = fields_str or ''
-
-    tb_body = tb_str
-    if tb_body_indent:
-        tb_body: str = textwrap.indent(
-            tb_str,
-            prefix=tb_body_indent * ' ',
-        )
-
-    tb_box: str = (
-        f'|\n'
-        f' ------ - ------\n'
-        f'{tb_body}'
-        f' ------ - ------\n'
-        f'_|\n'
-    )
-    tb_box_indent: str = (
-        tb_box_indent
-        or
-        1
-
-        # (len(field_prefix))
-        # ? ^-TODO-^ ? if you wanted another indent level
-    )
-    if tb_box_indent > 0:
-        tb_box: str = textwrap.indent(
-            tb_box,
-            prefix=tb_box_indent * ' ',
-        )
-
-    return (
-        fields
-        +
-        tb_box
-    )
-
-
-def pformat_caller_frame(
-    stack_limit: int = 1,
-    box_tb: bool = True,
-) -> str:
-    '''
-    Capture and return the traceback text content from
-    `stack_limit` call frames up.
-
-    '''
-    tb_str: str = (
-        '\n'.join(
-            traceback.format_stack(limit=stack_limit)
-        )
-    )
-    if box_tb:
-        tb_str: str = pformat_boxed_tb(
-            tb_str=tb_str,
-            field_prefix='  ',
-            indent='',
-        )
-    return tb_str
-
-
-def pformat_cs(
-    cs: CancelScope,
-    var_name: str = 'cs',
-    field_prefix: str = ' |_',
-) -> str:
-    '''
-    Pretty format info about a `trio.CancelScope` including most
-    of its public state and `._cancel_status`.
-
-    The output can be modified to show a "var name" for the
-    instance as a field prefix, just a simple str before each
-    line more or less.
-
-    '''
-
-    fields: str = textwrap.indent(
-        (
-            f'cancel_called = {cs.cancel_called}\n'
-            f'cancelled_caught = {cs.cancelled_caught}\n'
-            f'_cancel_status = {cs._cancel_status}\n'
-            f'shield = {cs.shield}\n'
-        ),
-        prefix=field_prefix,
-    )
-    return (
-        f'{var_name}: {cs}\n'
-        +
-        fields
-    )

tractor/experimental/_pubsub.py

@@ -31,13 +31,13 @@ from typing import (
     Callable,
 )
 from functools import partial
-from contextlib import aclosing
+from async_generator import aclosing
 
 import trio
 import wrapt
 
 from ..log import get_logger
-from .._context import Context
+from .._streaming import Context
 
 
 __all__ = ['pub']
@@ -148,8 +148,7 @@ def pub(
     *,
     tasks: set[str] = set(),
 ):
-    '''
-    Publisher async generator decorator.
+    """Publisher async generator decorator.
 
     A publisher can be called multiple times from different actors but
     will only spawn a finite set of internal tasks to stream values to
@@ -228,8 +227,7 @@ def pub(
     running in a single actor to stream data to an arbitrary number of
     subscribers. If you are ok to have a new task running for every call
     to ``pub_service()`` then probably don't need this.
-
-    '''
+    """
     global _pubtask2lock
 
     # handle the decorator not called with () case

tractor/log.py

@@ -21,11 +21,6 @@ Log like a forester!
 from collections.abc import Mapping
 import sys
 import logging
-from logging import (
-    LoggerAdapter,
-    Logger,
-    StreamHandler,
-)
 import colorlog  # type: ignore
 
 import trio
@@ -53,20 +48,17 @@ LOG_FORMAT = (
 
 DATE_FORMAT = '%b %d %H:%M:%S'
 
-# FYI, ERROR is 40
-# TODO: use a `bidict` to avoid the :155 check?
-CUSTOM_LEVELS: dict[str, int] = {
+LEVELS = {
     'TRANSPORT': 5,
     'RUNTIME': 15,
-    'DEVX': 17,
-    'CANCEL': 22,
+    'CANCEL': 16,
     'PDB': 500,
 }
+
 STD_PALETTE = {
     'CRITICAL': 'red',
     'ERROR': 'red',
     'PDB': 'white',
-    'DEVX': 'cyan',
     'WARNING': 'yellow',
     'INFO': 'green',
     'CANCEL': 'yellow',
@@ -83,18 +75,13 @@ BOLD_PALETTE = {
 
 # TODO: this isn't showing the correct '{filename}'
 # as it did before..
-class StackLevelAdapter(LoggerAdapter):
+class StackLevelAdapter(logging.LoggerAdapter):
 
     def transport(
         self,
         msg: str,
 
     ) -> None:
-        '''
-        IPC transport level msg IO; generally anything below
-        `._ipc.Channel` and friends.
-
-        '''
         return self.log(5, msg)
 
     def runtime(
@@ -107,68 +94,22 @@ class StackLevelAdapter(LoggerAdapter):
         self,
         msg: str,
     ) -> None:
-        '''
-        Cancellation sequencing, mostly for runtime reporting.
-
-        '''
-        return self.log(
-            level=22,
-            msg=msg,
-            # stacklevel=4,
-        )
+        return self.log(16, msg)
 
     def pdb(
         self,
         msg: str,
     ) -> None:
-        '''
-        `pdb`-REPL (debugger) related statuses.
-
-        '''
         return self.log(500, msg)
 
-    def devx(
-        self,
-        msg: str,
-    ) -> None:
-        '''
-        "Developer experience" sub-sys statuses.
-
-        '''
-        return self.log(17, msg)
-
-    def log(
-        self,
-        level,
-        msg,
-        *args,
-        **kwargs,
-    ):
-        '''
+    def log(self, level, msg, *args, **kwargs):
+        """
         Delegate a log call to the underlying logger, after adding
         contextual information from this adapter instance.
-
-        NOTE: all custom level methods (above) delegate to this!
-
-        '''
+        """
         if self.isEnabledFor(level):
-            stacklevel: int = 3
-            if (
-                level in CUSTOM_LEVELS.values()
-            ):
-                stacklevel: int = 4
-
             # msg, kwargs = self.process(msg, kwargs)
-            self._log(
-                level=level,
-                msg=msg,
-                args=args,
-                # NOTE: not sure how this worked before but, it
-                # seems with our custom level methods defined above
-                # we do indeed (now) require another stack level??
-                stacklevel=stacklevel,
-                **kwargs,
-            )
+            self._log(level, msg, args, **kwargs)
 
     # LOL, the stdlib doesn't allow passing through ``stacklevel``..
     def _log(
@@ -181,15 +122,12 @@ class StackLevelAdapter(LoggerAdapter):
         stack_info=False,
 
         # XXX: bit we added to show fileinfo from actual caller.
-        # - this level
-        # - then ``.log()``
-        # - then finally the caller's level..
-        stacklevel=4,
+        # this level then ``.log()`` then finally the caller's level..
+        stacklevel=3,
     ):
-        '''
+        """
         Low-level log implementation, proxied to allow nested logger adapters.
-
-        '''
+        """
         return self.logger._log(
             level,
             msg,
@@ -201,30 +139,8 @@ class StackLevelAdapter(LoggerAdapter):
         )
 
 
-# TODO IDEAs:
-# -[ ] move to `.devx.pformat`?
-# -[ ] do per task-name and actor-name color coding
-# -[ ] unique color per task-id and actor-uuid
-def pformat_task_uid(
-    id_part: str = 'tail'
-):
-    '''
-    Return `str`-ified unique for a `trio.Task` via a combo of its
-    `.name: str` and `id()` truncated output.
-
-    '''
-    task: trio.Task = trio.lowlevel.current_task()
-    tid: str = str(id(task))
-    if id_part == 'tail':
-        tid_part: str = tid[-6:]
-    else:
-        tid_part: str = tid[:6]
-
-    return f'{task.name}[{tid_part}]'
-
-
 _conc_name_getters = {
-    'task': pformat_task_uid,
+    'task': lambda: trio.lowlevel.current_task().name,
     'actor': lambda: current_actor(),
     'actor_name': lambda: current_actor().name,
     'actor_uid': lambda: current_actor().uid[1][:6],
@@ -232,10 +148,7 @@ _conc_name_getters = {
 
 
 class ActorContextInfo(Mapping):
-    '''
-    Dyanmic lookup for local actor and task names.
-
-    '''
+    "Dyanmic lookup for local actor and task names"
     _context_keys = (
         'task',
         'actor',
@@ -266,42 +179,17 @@ def get_logger(
     '''Return the package log or a sub-logger for ``name`` if provided.
 
     '''
-    log: Logger
     log = rlog = logging.getLogger(_root_name)
 
-    if (
-        name
-        and name != _proj_name
-    ):
+    if name and name != _proj_name:
 
-        # NOTE: for handling for modules that use ``get_logger(__name__)``
-        # we make the following stylistic choice:
-        # - always avoid duplicate project-package token
-        #   in msg output: i.e. tractor.tractor _ipc.py in header
-        #   looks ridiculous XD
-        # - never show the leaf module name in the {name} part
-        #   since in python the {filename} is always this same
-        #   module-file.
-
-        sub_name: None | str = None
-        rname, _, sub_name = name.partition('.')
-        pkgpath, _, modfilename = sub_name.rpartition('.')
-
-        # NOTE: for tractor itself never include the last level
-        # module key in the name such that something like: eg.
-        # 'tractor.trionics._broadcast` only includes the first
-        # 2 tokens in the (coloured) name part.
-        if rname == 'tractor':
-            sub_name = pkgpath
-
-        if _root_name in sub_name:
-            duplicate, _, sub_name = sub_name.partition('.')
-
-        if not sub_name:
-            log = rlog
-        else:
-            log = rlog.getChild(sub_name)
+        # handling for modules that use ``get_logger(__name__)`` to
+        # avoid duplicate project-package token in msg output
+        rname, _, tail = name.partition('.')
+        if rname == _root_name:
+            name = tail
 
+        log = rlog.getChild(name)
         log.level = rlog.level
 
     # add our actor-task aware adapter which will dynamically look up
@@ -309,7 +197,7 @@ def get_logger(
     logger = StackLevelAdapter(log, ActorContextInfo())
 
     # additional levels
-    for name, val in CUSTOM_LEVELS.items():
+    for name, val in LEVELS.items():
         logging.addLevelName(val, name)
 
         # ensure customs levels exist as methods
@@ -321,7 +209,7 @@ def get_logger(
 def get_console_log(
     level: str | None = None,
     **kwargs,
-) -> LoggerAdapter:
+) -> logging.LoggerAdapter:
     '''Get the package logger and enable a handler which writes to stderr.
 
     Yeah yeah, i know we can use ``DictConfig``. You do it.
@@ -332,21 +220,13 @@ def get_console_log(
     if not level:
         return log
 
-    log.setLevel(
-        level.upper()
-        if not isinstance(level, int)
-        else level
-    )
+    log.setLevel(level.upper() if not isinstance(level, int) else level)
 
     if not any(
         handler.stream == sys.stderr  # type: ignore
-        for handler in logger.handlers if getattr(
-            handler,
-            'stream',
-            None,
-        )
+        for handler in logger.handlers if getattr(handler, 'stream', None)
     ):
-        handler = StreamHandler()
+        handler = logging.StreamHandler()
         formatter = colorlog.ColoredFormatter(
             LOG_FORMAT,
             datefmt=DATE_FORMAT,
@@ -362,23 +242,3 @@ def get_console_log(
 
 def get_loglevel() -> str:
     return _default_loglevel
-
-
-# global module logger for tractor itself
-log = get_logger('tractor')
-
-
-def at_least_level(
-    log: Logger|LoggerAdapter,
-    level: int|str,
-) -> bool:
-    '''
-    Predicate to test if a given level is active.
-
-    '''
-    if isinstance(level, str):
-        level: int = CUSTOM_LEVELS[level.upper()]
-
-    if log.getEffectiveLevel() <= level:
-        return True
-    return False

tractor/msg.py

@@ -0,0 +1,80 @@
+# tractor: structured concurrent "actors".
+# Copyright 2018-eternity Tyler Goodlet.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+'''
+Built-in messaging patterns, types, APIs and helpers.
+
+'''
+
+# TODO: integration with our ``enable_modules: list[str]`` caps sys.
+
+# ``pkgutil.resolve_name()`` internally uses
+# ``importlib.import_module()`` which can be filtered by inserting
+# a ``MetaPathFinder`` into ``sys.meta_path`` (which we could do before
+# entering the ``_runtime.process_messages()`` loop).
+# - https://github.com/python/cpython/blob/main/Lib/pkgutil.py#L645
+# - https://stackoverflow.com/questions/1350466/preventing-python-code-from-importing-certain-modules
+#   - https://stackoverflow.com/a/63320902
+#   - https://docs.python.org/3/library/sys.html#sys.meta_path
+
+# the new "Implicit Namespace Packages" might be relevant?
+# - https://www.python.org/dev/peps/pep-0420/
+
+# add implicit serialized message type support so that paths can be
+# handed directly to IPC primitives such as streams and `Portal.run()`
+# calls:
+# - via ``msgspec``:
+#   - https://jcristharif.com/msgspec/api.html#struct
+#   - https://jcristharif.com/msgspec/extending.html
+# via ``msgpack-python``:
+# - https://github.com/msgpack/msgpack-python#packingunpacking-of-custom-data-type
+
+from __future__ import annotations
+from pkgutil import resolve_name
+
+
+class NamespacePath(str):
+    '''
+    A serializeable description of a (function) Python object location
+    described by the target's module path and namespace key meant as
+    a message-native "packet" to allows actors to point-and-load objects
+    by absolute reference.
+
+    '''
+    _ref: object = None
+
+    def load_ref(self) -> object:
+        if self._ref is None:
+            self._ref = resolve_name(self)
+        return self._ref
+
+    def to_tuple(
+        self,
+
+    ) -> tuple[str, str]:
+        ref = self.load_ref()
+        return ref.__module__, getattr(ref, '__name__', '')
+
+    @classmethod
+    def from_ref(
+        cls,
+        ref,
+
+    ) -> NamespacePath:
+        return cls(':'.join(
+            (ref.__module__,
+             getattr(ref, '__name__', ''))
+        ))

tractor/msg/__init__.py

@@ -1,73 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-'''
-Built-in messaging patterns, types, APIs and helpers.
-
-'''
-from typing import (
-    TypeAlias,
-)
-from .ptr import (
-    NamespacePath as NamespacePath,
-)
-from .pretty_struct import (
-    Struct as Struct,
-)
-from ._codec import (
-    _def_msgspec_codec as _def_msgspec_codec,
-    _ctxvar_MsgCodec as _ctxvar_MsgCodec,
-
-    apply_codec as apply_codec,
-    mk_codec as mk_codec,
-    MsgCodec as MsgCodec,
-    MsgDec as MsgDec,
-    current_codec as current_codec,
-)
-# currently can't bc circular with `._context`
-# from ._ops import (
-#     PldRx as PldRx,
-#     _drain_to_final_msg as _drain_to_final_msg,
-# )
-
-from .types import (
-    PayloadMsg as PayloadMsg,
-
-    Aid as Aid,
-    SpawnSpec as SpawnSpec,
-
-    Start as Start,
-    StartAck as StartAck,
-
-    Started as Started,
-    Yield as Yield,
-    Stop as Stop,
-    Return as Return,
-    CancelAck as CancelAck,
-
-    Error as Error,
-
-    # type-var for `.pld` field
-    PayloadT as PayloadT,
-
-    # full msg class set from above as list
-    __msg_types__ as __msg_types__,
-
-    # type-alias for union of all msgs
-    MsgType as MsgType,
-)
-
-__msg_spec__: TypeAlias = MsgType

tractor/msg/_codec.py

@@ -1,660 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-'''
-IPC msg interchange codec management.
-
-Supported backend libs:
-- `msgspec.msgpack`
-
-ToDo: backends we prolly should offer:
-
-- see project/lib list throughout GH issue discussion comments:
-  https://github.com/goodboy/tractor/issues/196
-
-- `capnproto`: https://capnproto.org/rpc.html
-   - https://capnproto.org/language.html#language-reference
-
-'''
-from __future__ import annotations
-from contextlib import (
-    contextmanager as cm,
-)
-from contextvars import (
-    ContextVar,
-    Token,
-)
-import textwrap
-from typing import (
-    Any,
-    Callable,
-    Type,
-    TYPE_CHECKING,
-    Union,
-)
-from types import ModuleType
-
-import msgspec
-from msgspec import (
-    msgpack,
-    Raw,
-)
-# TODO: see notes below from @mikenerone..
-# from tricycle import TreeVar
-
-from tractor.msg.pretty_struct import Struct
-from tractor.msg.types import (
-    mk_msg_spec,
-    MsgType,
-)
-from tractor.log import get_logger
-
-if TYPE_CHECKING:
-    from tractor._context import Context
-
-log = get_logger(__name__)
-
-
-# TODO: unify with `MsgCodec` by making `._dec` part this?
-class MsgDec(Struct):
-    '''
-    An IPC msg (payload) decoder.
-
-    Normally used to decode only a payload: `MsgType.pld:
-    PayloadT` field before delivery to IPC consumer code.
-
-    '''
-    _dec: msgpack.Decoder
-
-    @property
-    def dec(self) -> msgpack.Decoder:
-        return self._dec
-
-    def __repr__(self) -> str:
-
-        speclines: str = self.spec_str
-
-        # in multi-typed spec case we stick the list
-        # all on newlines after the |__pld_spec__:,
-        # OW it's prolly single type spec-value
-        # so just leave it on same line.
-        if '\n' in speclines:
-            speclines: str = '\n' + textwrap.indent(
-                speclines,
-                prefix=' '*3,
-            )
-
-        body: str = textwrap.indent(
-            f'|_dec_hook: {self.dec.dec_hook}\n'
-            f'|__pld_spec__: {speclines}\n',
-            prefix=' '*2,
-        )
-        return (
-            f'<{type(self).__name__}(\n'
-            f'{body}'
-            ')>'
-        )
-
-    # struct type unions
-    # https://jcristharif.com/msgspec/structs.html#tagged-unions
-    #
-    # ^-TODO-^: make a wrapper type for this such that alt
-    # backends can be represented easily without a `Union` needed,
-    # AND so that we have better support for wire transport.
-    #
-    # -[ ] maybe `FieldSpec` is a good name since msg-spec
-    #   better applies to a `MsgType[FieldSpec]`?
-    #
-    # -[ ] both as part of the `.open_context()` call AND as part of the
-    #     immediate ack-reponse (see similar below)
-    #     we should do spec matching and fail if anything is awry?
-    #
-    # -[ ] eventually spec should be generated/parsed from the
-    #     type-annots as # desired in GH issue:
-    #     https://github.com/goodboy/tractor/issues/365
-    #
-    # -[ ] semantics of the mismatch case
-    #   - when caller-callee specs we should raise
-    #    a `MsgTypeError` or `MsgSpecError` or similar?
-    #
-    # -[ ] wrapper types for both spec types such that we can easily
-    #     IPC transport them?
-    #     - `TypeSpec: Union[Type]`
-    #      * also a `.__contains__()` for doing `None in
-    #      TypeSpec[None|int]` since rn you need to do it on
-    #      `.__args__` for unions..
-    #     - `MsgSpec: Union[MsgType]
-    #
-    # -[ ] auto-genning this from new (in 3.12) type parameter lists Bo
-    # |_ https://docs.python.org/3/reference/compound_stmts.html#type-params
-    # |_ historical pep 695: https://peps.python.org/pep-0695/
-    # |_ full lang spec: https://typing.readthedocs.io/en/latest/spec/
-    # |_ on annotation scopes:
-    #    https://docs.python.org/3/reference/executionmodel.html#annotation-scopes
-    # |_ 3.13 will have subscriptable funcs Bo
-    #    https://peps.python.org/pep-0718/
-    @property
-    def spec(self) -> Union[Type[Struct]]:
-        # NOTE: defined and applied inside `mk_codec()`
-        return self._dec.type
-
-    # no difference, as compared to a `MsgCodec` which defines the
-    # `MsgType.pld: PayloadT` part of its spec separately
-    pld_spec = spec
-
-    # TODO: would get moved into `FieldSpec.__str__()` right?
-    @property
-    def spec_str(self) -> str:
-        return pformat_msgspec(
-            codec=self,
-            join_char='|',
-        )
-
-    pld_spec_str = spec_str
-
-    def decode(
-        self,
-        raw: Raw|bytes,
-    ) -> Any:
-        return self._dec.decode(raw)
-
-    @property
-    def hook(self) -> Callable|None:
-        return self._dec.dec_hook
-
-
-def mk_dec(
-    spec: Union[Type[Struct]]|Any = Any,
-    dec_hook: Callable|None = None,
-
-) -> MsgDec:
-
-    return MsgDec(
-        _dec=msgpack.Decoder(
-            type=spec,  # like `MsgType[Any]`
-            dec_hook=dec_hook,
-        )
-    )
-
-
-def mk_msgspec_table(
-    dec: msgpack.Decoder,
-    msg: MsgType|None = None,
-
-) -> dict[str, MsgType]|str:
-    '''
-    Fill out a `dict` of `MsgType`s keyed by name
-    for a given input `msgspec.msgpack.Decoder`
-    as defined by its `.type: Union[Type]` setting.
-
-    If `msg` is provided, only deliver a `dict` with a single
-    entry for that type.
-
-    '''
-    msgspec: Union[Type]|Type = dec.type
-
-    if not (msgtypes := getattr(msgspec, '__args__', False)):
-        msgtypes = [msgspec]
-
-    msgt_table: dict[str, MsgType] = {
-        msgt: str(msgt.__name__)
-        for msgt in msgtypes
-    }
-    if msg:
-        msgt: MsgType = type(msg)
-        str_repr: str = msgt_table[msgt]
-        return {msgt: str_repr}
-
-    return msgt_table
-
-
-def pformat_msgspec(
-    codec: MsgCodec|MsgDec,
-    msg: MsgType|None = None,
-    join_char: str = '\n',
-
-) -> str:
-    dec: msgpack.Decoder = getattr(codec, 'dec', codec)
-    return join_char.join(
-        mk_msgspec_table(
-            dec=dec,
-            msg=msg,
-        ).values()
-    )
-
-# TODO: overall IPC msg-spec features (i.e. in this mod)!
-#
-# -[ ] API changes towards being interchange lib agnostic!
-#   -[ ] capnproto has pre-compiled schema for eg..
-#    * https://capnproto.org/language.html
-#    * http://capnproto.github.io/pycapnp/quickstart.html
-#     * https://github.com/capnproto/pycapnp/blob/master/examples/addressbook.capnp
-#
-# -[ ] struct aware messaging coders as per:
-#   -[x] https://github.com/goodboy/tractor/issues/36
-#   -[ ] https://github.com/goodboy/tractor/issues/196
-#   -[ ] https://github.com/goodboy/tractor/issues/365
-#
-class MsgCodec(Struct):
-    '''
-    A IPC msg interchange format lib's encoder + decoder pair.
-
-    Pretty much nothing more then delegation to underlying
-    `msgspec.<interchange-protocol>.Encoder/Decoder`s for now.
-
-    '''
-    _enc: msgpack.Encoder
-    _dec: msgpack.Decoder
-    _pld_spec: Type[Struct]|Raw|Any
-
-    def __repr__(self) -> str:
-        speclines: str = textwrap.indent(
-            pformat_msgspec(codec=self),
-            prefix=' '*3,
-        )
-        body: str = textwrap.indent(
-            f'|_lib = {self.lib.__name__!r}\n'
-            f'|_enc_hook: {self.enc.enc_hook}\n'
-            f'|_dec_hook: {self.dec.dec_hook}\n'
-            f'|_pld_spec: {self.pld_spec_str}\n'
-            # f'|\n'
-            f'|__msg_spec__:\n'
-            f'{speclines}\n',
-            prefix=' '*2,
-        )
-        return (
-            f'<{type(self).__name__}(\n'
-            f'{body}'
-            ')>'
-        )
-
-    @property
-    def pld_spec(self) -> Type[Struct]|Raw|Any:
-        return self._pld_spec
-
-    @property
-    def pld_spec_str(self) -> str:
-
-        # TODO: could also use match: instead?
-        spec: Union[Type]|Type = self.pld_spec
-
-        # `typing.Union` case
-        if getattr(spec, '__args__', False):
-            return str(spec)
-
-        # just a single type
-        else:
-            return spec.__name__
-
-    # struct type unions
-    # https://jcristharif.com/msgspec/structs.html#tagged-unions
-    @property
-    def msg_spec(self) -> Union[Type[Struct]]:
-        # NOTE: defined and applied inside `mk_codec()`
-        return self._dec.type
-
-    # TODO: some way to make `pretty_struct.Struct` use this
-    # wrapped field over the `.msg_spec` one?
-    @property
-    def msg_spec_str(self) -> str:
-        return pformat_msgspec(self.msg_spec)
-
-    lib: ModuleType = msgspec
-
-    # TODO: use `functools.cached_property` for these ?
-    # https://docs.python.org/3/library/functools.html#functools.cached_property
-    @property
-    def enc(self) -> msgpack.Encoder:
-        return self._enc
-
-    # TODO: reusing encode buffer for perf?
-    # https://jcristharif.com/msgspec/perf-tips.html#reusing-an-output-buffer
-    _buf: bytearray = bytearray()
-
-    def encode(
-        self,
-        py_obj: Any,
-
-        use_buf: bool = False,
-        # ^-XXX-^ uhh why am i getting this?
-        # |_BufferError: Existing exports of data: object cannot be re-sized
-
-    ) -> bytes:
-        '''
-        Encode input python objects to `msgpack` bytes for
-        transfer on a tranport protocol connection.
-
-        When `use_buf == True` use the output buffer optimization:
-        https://jcristharif.com/msgspec/perf-tips.html#reusing-an-output-buffer
-
-        '''
-        if use_buf:
-            self._enc.encode_into(py_obj, self._buf)
-            return self._buf
-        else:
-            return self._enc.encode(py_obj)
-
-    @property
-    def dec(self) -> msgpack.Decoder:
-        return self._dec
-
-    def decode(
-        self,
-        msg: bytes,
-    ) -> Any:
-        '''
-        Decode received `msgpack` bytes into a local python object
-        with special `msgspec.Struct` (or other type) handling
-        determined by the 
-
-        '''
-        # https://jcristharif.com/msgspec/usage.html#typed-decoding
-        return self._dec.decode(msg)
-
-
-# [x] TODO: a sub-decoder system as well? => No!
-#
-# -[x] do we still want to try and support the sub-decoder with
-# `.Raw` technique in the case that the `Generic` approach gives
-# future grief?
-# => NO, since we went with the `PldRx` approach instead B)
-#
-# IF however you want to see the code that was staged for this
-# from wayyy back, see the pure removal commit.
-
-
-def mk_codec(
-    # struct type unions set for `Decoder`
-    # https://jcristharif.com/msgspec/structs.html#tagged-unions
-    ipc_pld_spec: Union[Type[Struct]]|Any = Any,
-
-    # TODO: offering a per-msg(-field) type-spec such that
-    # the fields can be dynamically NOT decoded and left as `Raw`
-    # values which are later loaded by a sub-decoder specified
-    # by `tag_field: str` value key?
-    # payload_msg_specs: dict[
-    #     str,  # tag_field value as sub-decoder key
-    #     Union[Type[Struct]]  # `MsgType.pld` type spec
-    # ]|None = None,
-
-    libname: str = 'msgspec',
-
-    # proxy as `Struct(**kwargs)` for ad-hoc type extensions
-    # https://jcristharif.com/msgspec/extending.html#mapping-to-from-native-types
-    # ------ - ------
-    dec_hook: Callable|None = None,
-    enc_hook: Callable|None = None,
-    # ------ - ------
-    #
-    # Encoder:
-    # write_buffer_size=write_buffer_size,
-    #
-    # Decoder:
-    # ext_hook: ext_hook_sig
-
-) -> MsgCodec:
-    '''
-    Convenience factory for creating codecs eventually meant
-    to be interchange lib agnostic (i.e. once we support more then just
-    `msgspec` ;).
-
-    '''
-    # (manually) generate a msg-payload-spec for all relevant
-    # god-boxing-msg subtypes, parameterizing the `PayloadMsg.pld: PayloadT`
-    # for the decoder such that all sub-type msgs in our SCIPP
-    # will automatically decode to a type-"limited" payload (`Struct`)
-    # object (set).
-    (
-        ipc_msg_spec,
-        msg_types,
-    ) = mk_msg_spec(
-        payload_type_union=ipc_pld_spec,
-    )
-    assert len(ipc_msg_spec.__args__) == len(msg_types)
-    assert ipc_msg_spec
-
-    # TODO: use this shim instead?
-    # bc.. unification, err somethin?
-    # dec: MsgDec = mk_dec(
-    #     spec=ipc_msg_spec,
-    #     dec_hook=dec_hook,
-    # )
-
-    dec = msgpack.Decoder(
-        type=ipc_msg_spec,
-        dec_hook=dec_hook,
-    )
-    enc = msgpack.Encoder(
-       enc_hook=enc_hook,
-    )
-
-    codec = MsgCodec(
-        _enc=enc,
-        _dec=dec,
-        _pld_spec=ipc_pld_spec,
-    )
-
-    # sanity on expected backend support
-    assert codec.lib.__name__ == libname
-
-    return codec
-
-
-# instance of the default `msgspec.msgpack` codec settings, i.e.
-# no custom structs, hooks or other special types.
-_def_msgspec_codec: MsgCodec = mk_codec(ipc_pld_spec=Any)
-
-# The built-in IPC `Msg` spec.
-# Our composing "shuttle" protocol which allows `tractor`-app code
-# to use any `msgspec` supported type as the `PayloadMsg.pld` payload,
-# https://jcristharif.com/msgspec/supported-types.html
-#
-_def_tractor_codec: MsgCodec = mk_codec(
-    # TODO: use this for debug mode locking prot?
-    # ipc_pld_spec=Any,
-    ipc_pld_spec=Raw,
-)
-# TODO: IDEALLY provides for per-`trio.Task` specificity of the
-# IPC msging codec used by the transport layer when doing
-# `Channel.send()/.recv()` of wire data.
-
-# ContextVar-TODO: DIDN'T WORK, kept resetting in every new task to default!?
-# _ctxvar_MsgCodec: ContextVar[MsgCodec] = ContextVar(
-
-# TreeVar-TODO: DIDN'T WORK, kept resetting in every new embedded nursery
-# even though it's supposed to inherit from a parent context ???
-#
-# _ctxvar_MsgCodec: TreeVar[MsgCodec] = TreeVar(
-#
-# ^-NOTE-^: for this to work see the mods by @mikenerone from `trio` gitter:
-#
-# 22:02:54 <mikenerone> even for regular contextvars, all you have to do is:
-#    `task: Task = trio.lowlevel.current_task()`
-#    `task.parent_nursery.parent_task.context.run(my_ctx_var.set, new_value)`
-#
-# From a comment in his prop code he couldn't share outright:
-# 1. For every TreeVar set in the current task (which covers what
-#    we need from SynchronizerFacade), walk up the tree until the
-#    root or finding one where the TreeVar is already set, setting
-#    it in all of the contexts along the way.
-# 2. For each of those, we also forcibly set the values that are
-#    pending for child nurseries that have not yet accessed the
-#    TreeVar.
-# 3. We similarly set the pending values for the child nurseries
-#    of the *current* task.
-#
-_ctxvar_MsgCodec: ContextVar[MsgCodec] = ContextVar(
-    'msgspec_codec',
-    default=_def_tractor_codec,
-)
-
-
-@cm
-def apply_codec(
-    codec: MsgCodec,
-
-    ctx: Context|None = None,
-
-) -> MsgCodec:
-    '''
-    Dynamically apply a `MsgCodec` to the current task's runtime
-    context such that all (of a certain class of payload
-    containing i.e. `MsgType.pld: PayloadT`) IPC msgs are
-    processed with it for that task.
-
-    Uses a `contextvars.ContextVar` to ensure the scope of any
-    codec setting matches the current `Context` or
-    `._rpc.process_messages()` feeder task's prior setting without
-    mutating any surrounding scope.
-
-    When a `ctx` is supplied, only mod its `Context.pld_codec`.
-
-    matches the `@cm` block and DOES NOT change to the original
-    (default) value in new tasks (as it does for `ContextVar`).
-
-    '''
-    __tracebackhide__: bool = True
-
-    if ctx is not None:
-        var: ContextVar = ctx._var_pld_codec
-    else:
-        # use IPC channel-connection "global" codec
-        var: ContextVar = _ctxvar_MsgCodec
-
-    orig: MsgCodec = var.get()
-
-    assert orig is not codec
-    if codec.pld_spec is None:
-        breakpoint()
-
-    log.info(
-        'Applying new msg-spec codec\n\n'
-        f'{codec}\n'
-    )
-    token: Token = var.set(codec)
-
-    # ?TODO? for TreeVar approach which copies from the
-    # cancel-scope of the prior value, NOT the prior task
-    # See the docs:
-    # - https://tricycle.readthedocs.io/en/latest/reference.html#tree-variables
-    # - https://github.com/oremanj/tricycle/blob/master/tricycle/_tests/test_tree_var.py
-    #   ^- see docs for @cm `.being()` API
-    # with _ctxvar_MsgCodec.being(codec):
-    #     new = _ctxvar_MsgCodec.get()
-    #     assert new is codec
-    #     yield codec
-
-    try:
-        yield var.get()
-    finally:
-        var.reset(token)
-        log.info(
-            'Reverted to last msg-spec codec\n\n'
-            f'{orig}\n'
-        )
-        assert var.get() is orig
-
-
-def current_codec() -> MsgCodec:
-    '''
-    Return the current `trio.Task.context`'s value
-    for `msgspec_codec` used by `Channel.send/.recv()`
-    for wire serialization.
-
-    '''
-    return _ctxvar_MsgCodec.get()
-
-
-@cm
-def limit_msg_spec(
-    payload_spec: Union[Type[Struct]],
-
-    # TODO: don't need this approach right?
-    # -> related to the `MsgCodec._payload_decs` stuff above..
-    # tagged_structs: list[Struct]|None = None,
-
-    **codec_kwargs,
-
-) -> MsgCodec:
-    '''
-    Apply a `MsgCodec` that will natively decode the SC-msg set's
-    `PayloadMsg.pld: Union[Type[Struct]]` payload fields using
-    tagged-unions of `msgspec.Struct`s from the `payload_types`
-    for all IPC contexts in use by the current `trio.Task`.
-
-    '''
-    __tracebackhide__: bool = True
-    curr_codec: MsgCodec = current_codec()
-    msgspec_codec: MsgCodec = mk_codec(
-        ipc_pld_spec=payload_spec,
-        **codec_kwargs,
-    )
-    with apply_codec(msgspec_codec) as applied_codec:
-        assert applied_codec is msgspec_codec
-        yield msgspec_codec
-
-    assert curr_codec is current_codec()
-
-
-# XXX: msgspec won't allow this with non-struct custom types
-# like `NamespacePath`!@!
-# @cm
-# def extend_msg_spec(
-#     payload_spec: Union[Type[Struct]],
-
-# ) -> MsgCodec:
-#     '''
-#     Extend the current `MsgCodec.pld_spec` (type set) by extending
-#     the payload spec to **include** the types specified by
-#     `payload_spec`.
-
-#     '''
-#     codec: MsgCodec = current_codec()
-#     pld_spec: Union[Type] = codec.pld_spec
-#     extended_spec: Union[Type] = pld_spec|payload_spec
-
-#     with limit_msg_spec(payload_types=extended_spec) as ext_codec:
-#         # import pdbp; pdbp.set_trace()
-#         assert ext_codec.pld_spec == extended_spec
-#         yield ext_codec
-
-
-# TODO: make something similar to this inside `._codec` such that
-# user can just pass a type table of some sort?
-# -[ ] we would need to decode all msgs to `pretty_struct.Struct`
-#     and then call `.to_dict()` on them?
-# -[x] we're going to need to re-impl all the stuff changed in the
-#    runtime port such that it can handle dicts or `Msg`s?
-#
-# def mk_dict_msg_codec_hooks() -> tuple[Callable, Callable]:
-#     '''
-#     Deliver a `enc_hook()`/`dec_hook()` pair which does
-#     manual convertion from our above native `Msg` set
-#     to `dict` equivalent (wire msgs) in order to keep legacy compat
-#     with the original runtime implementation.
-#
-#     Note: this is is/was primarly used while moving the core
-#     runtime over to using native `Msg`-struct types wherein we
-#     start with the send side emitting without loading
-#     a typed-decoder and then later flipping the switch over to
-#     load to the native struct types once all runtime usage has
-#     been adjusted appropriately.
-#
-#     '''
-#     return (
-#         # enc_to_dict,
-#         dec_from_dict,
-#     )

tractor/msg/_ops.py

@@ -1,842 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-'''
-Near-application abstractions for `MsgType.pld: PayloadT|Raw`
-delivery, filtering and type checking as well as generic
-operational helpers for processing transaction flows.
-
-'''
-from __future__ import annotations
-from contextlib import (
-    asynccontextmanager as acm,
-    contextmanager as cm,
-)
-from typing import (
-    Any,
-    Callable,
-    Type,
-    TYPE_CHECKING,
-    Union,
-)
-# ------ - ------
-from msgspec import (
-    msgpack,
-    Raw,
-    Struct,
-    ValidationError,
-)
-import trio
-# ------ - ------
-from tractor.log import get_logger
-from tractor._exceptions import (
-    MessagingError,
-    InternalError,
-    _raise_from_unexpected_msg,
-    MsgTypeError,
-    _mk_recv_mte,
-    pack_error,
-)
-from tractor._state import current_ipc_ctx
-from ._codec import (
-    mk_dec,
-    MsgDec,
-    MsgCodec,
-    current_codec,
-)
-from .types import (
-    CancelAck,
-    Error,
-    MsgType,
-    PayloadT,
-    Return,
-    Started,
-    Stop,
-    Yield,
-    pretty_struct,
-)
-
-
-if TYPE_CHECKING:
-    from tractor._context import Context
-    from tractor._streaming import MsgStream
-
-
-log = get_logger(__name__)
-
-
-_def_any_pldec: MsgDec[Any] = mk_dec()
-
-
-class PldRx(Struct):
-    '''
-    A "msg payload receiver".
-
-    The pairing of a "feeder" `trio.abc.ReceiveChannel` and an
-    interchange-specific (eg. msgpack) payload field decoder. The
-    validation/type-filtering rules are runtime mutable and allow
-    type constraining the set of `MsgType.pld: Raw|PayloadT`
-    values at runtime, per IPC task-context.
-
-    This abstraction, being just below "user application code",
-    allows for the equivalent of our `MsgCodec` (used for
-    typer-filtering IPC dialog protocol msgs against a msg-spec)
-    but with granular control around payload delivery (i.e. the
-    data-values user code actually sees and uses (the blobs that
-    are "shuttled" by the wrapping dialog prot) such that invalid
-    `.pld: Raw` can be decoded and handled by IPC-primitive user
-    code (i.e. that operates on `Context` and `Msgstream` APIs)
-    without knowledge of the lower level `Channel`/`MsgTransport`
-    primitives nor the `MsgCodec` in use. Further, lazily decoding
-    payload blobs allows for topical (and maybe intentionally
-    "partial") encryption of msg field subsets.
-
-    '''
-    # TODO: better to bind it here?
-    # _rx_mc: trio.MemoryReceiveChannel
-    _pld_dec: MsgDec
-    _ctx: Context|None = None
-    _ipc: Context|MsgStream|None = None
-
-    @property
-    def pld_dec(self) -> MsgDec:
-        return self._pld_dec
-
-    # TODO: a better name?
-    # -[ ] when would this be used as it avoids needingn to pass the
-    #   ipc prim to every method
-    @cm
-    def wraps_ipc(
-        self,
-        ipc_prim: Context|MsgStream,
-
-    ) -> PldRx:
-        '''
-        Apply this payload receiver to an IPC primitive type, one
-        of `Context` or `MsgStream`.
-
-        '''
-        self._ipc = ipc_prim
-        try:
-            yield self
-        finally:
-            self._ipc = None
-
-    @cm
-    def limit_plds(
-        self,
-        spec: Union[Type[Struct]],
-        **dec_kwargs,
-
-    ) -> MsgDec:
-        '''
-        Type-limit the loadable msg payloads via an applied
-        `MsgDec` given an input spec, revert to prior decoder on
-        exit.
-
-        '''
-        orig_dec: MsgDec = self._pld_dec
-        limit_dec: MsgDec = mk_dec(
-            spec=spec,
-            **dec_kwargs,
-        )
-        try:
-            self._pld_dec = limit_dec
-            yield limit_dec
-        finally:
-            self._pld_dec = orig_dec
-
-    @property
-    def dec(self) -> msgpack.Decoder:
-        return self._pld_dec.dec
-
-    def recv_pld_nowait(
-        self,
-        # TODO: make this `MsgStream` compat as well, see above^
-        # ipc_prim: Context|MsgStream,
-        ipc: Context|MsgStream,
-
-        ipc_msg: MsgType|None = None,
-        expect_msg: Type[MsgType]|None = None,
-        hide_tb: bool = False,
-        **dec_pld_kwargs,
-
-    ) -> Any|Raw:
-        __tracebackhide__: bool = hide_tb
-
-        msg: MsgType = (
-            ipc_msg
-            or
-
-            # sync-rx msg from underlying IPC feeder (mem-)chan
-            ipc._rx_chan.receive_nowait()
-        )
-        return self.decode_pld(
-            msg,
-            ipc=ipc,
-            expect_msg=expect_msg,
-            hide_tb=hide_tb,
-            **dec_pld_kwargs,
-        )
-
-    async def recv_pld(
-        self,
-        ipc: Context|MsgStream,
-        ipc_msg: MsgType|None = None,
-        expect_msg: Type[MsgType]|None = None,
-        hide_tb: bool = True,
-
-        **dec_pld_kwargs,
-
-    ) -> Any|Raw:
-        '''
-        Receive a `MsgType`, then decode and return its `.pld` field.
-
-        '''
-        __tracebackhide__: bool = hide_tb
-        msg: MsgType = (
-            ipc_msg
-            or
-            # async-rx msg from underlying IPC feeder (mem-)chan
-            await ipc._rx_chan.receive()
-        )
-        return self.decode_pld(
-            msg=msg,
-            ipc=ipc,
-            expect_msg=expect_msg,
-            **dec_pld_kwargs,
-        )
-
-    def decode_pld(
-        self,
-        msg: MsgType,
-        ipc: Context|MsgStream,
-        expect_msg: Type[MsgType]|None,
-
-        raise_error: bool = True,
-        hide_tb: bool = True,
-
-        # XXX for special (default?) case of send side call with
-        # `Context.started(validate_pld_spec=True)`
-        is_started_send_side: bool = False,
-
-    ) -> PayloadT|Raw:
-        '''
-        Decode a msg's payload field: `MsgType.pld: PayloadT|Raw` and
-        return the value or raise an appropriate error.
-
-        '''
-        __tracebackhide__: bool = hide_tb
-        src_err: BaseException|None = None
-        match msg:
-            # payload-data shuttle msg; deliver the `.pld` value
-            # directly to IPC (primitive) client-consumer code.
-            case (
-                Started(pld=pld)  # sync phase
-                |Yield(pld=pld)  # streaming phase
-                |Return(pld=pld)  # termination phase
-            ):
-                try:
-                    pld: PayloadT = self._pld_dec.decode(pld)
-                    log.runtime(
-                        'Decoded msg payload\n\n'
-                        f'{msg}\n'
-                        f'where payload decoded as\n'
-                        f'|_pld={pld!r}\n'
-                    )
-                    return pld
-
-                # XXX pld-value type failure
-                except ValidationError as valerr:
-                    # pack mgterr into error-msg for
-                    # reraise below; ensure remote-actor-err
-                    # info is displayed nicely?
-                    mte: MsgTypeError = _mk_recv_mte(
-                        msg=msg,
-                        codec=self.pld_dec,
-                        src_validation_error=valerr,
-                        is_invalid_payload=True,
-                        expected_msg=expect_msg,
-                    )
-                    # NOTE: just raise the MTE inline instead of all
-                    # the pack-unpack-repack non-sense when this is
-                    # a "send side" validation error.
-                    if is_started_send_side:
-                        raise mte
-
-                    # NOTE: the `.message` is automatically
-                    # transferred into the message as long as we
-                    # define it as a `Error.message` field.
-                    err_msg: Error = pack_error(
-                        exc=mte,
-                        cid=msg.cid,
-                        src_uid=(
-                            ipc.chan.uid
-                            if not is_started_send_side
-                            else ipc._actor.uid
-                        ),
-                    )
-                    mte._ipc_msg = err_msg
-
-                    # XXX override the `msg` passed to
-                    # `_raise_from_unexpected_msg()` (below) so so
-                    # that we're effectively able to use that same
-                    # func to unpack and raise an "emulated remote
-                    # `Error`" of this local MTE.
-                    msg = err_msg
-                    # XXX NOTE: so when the `_raise_from_unexpected_msg()`
-                    # raises the boxed `err_msg` from above it raises
-                    # it from the above caught interchange-lib
-                    # validation error.
-                    src_err = valerr
-
-            # a runtime-internal RPC endpoint response.
-            # always passthrough since (internal) runtime
-            # responses are generally never exposed to consumer
-            # code.
-            case CancelAck(
-                pld=bool(cancelled)
-            ):
-                return cancelled
-
-            case Error():
-                src_err = MessagingError(
-                    'IPC ctx dialog terminated without `Return`-ing a result\n'
-                    f'Instead it raised {msg.boxed_type_str!r}!'
-                )
-                # XXX NOTE XXX another super subtle runtime-y thing..
-                #
-                # - when user code (transitively) calls into this
-                #   func (usually via a `Context/MsgStream` API) we
-                #   generally want errors to propagate immediately
-                #   and directly so that the user can define how it
-                #   wants to handle them.
-                #
-                #  HOWEVER,
-                #
-                # - for certain runtime calling cases, we don't want to
-                #   directly raise since the calling code might have
-                #   special logic around whether to raise the error
-                #   or supress it silently (eg. a `ContextCancelled`
-                #   received from the far end which was requested by
-                #   this side, aka a self-cancel).
-                #
-                # SO, we offer a flag to control this.
-                if not raise_error:
-                    return src_err
-
-            case Stop(cid=cid):
-                ctx: Context = getattr(ipc, 'ctx', ipc)
-                message: str = (
-                    f'{ctx.side!r}-side of ctx received stream-`Stop` from '
-                    f'{ctx.peer_side!r} peer ?\n'
-                    f'|_cid: {cid}\n\n'
-
-                    f'{pretty_struct.pformat(msg)}\n'
-                )
-                if ctx._stream is None:
-                    explain: str = (
-                        f'BUT, no `MsgStream` (was) open(ed) on this '
-                        f'{ctx.side!r}-side of the IPC ctx?\n'
-                        f'Maybe check your code for streaming phase race conditions?\n'
-                    )
-                    log.warning(
-                        message
-                        +
-                        explain
-                    )
-                    # let caller decide what to do when only one
-                    # side opened a stream, don't raise.
-                    return msg
-
-                else:
-                    explain: str = (
-                        'Received a `Stop` when it should NEVER be possible!?!?\n'
-                    )
-                    # TODO: this is constructed inside
-                    # `_raise_from_unexpected_msg()` but maybe we
-                    # should pass it in?
-                    # src_err = trio.EndOfChannel(explain)
-                    src_err = None
-
-            case _:
-                src_err = InternalError(
-                    'Invalid IPC msg ??\n\n'
-                    f'{msg}\n'
-                )
-
-        # TODO: maybe use the new `.add_note()` from 3.11?
-        # |_https://docs.python.org/3.11/library/exceptions.html#BaseException.add_note
-        #
-        # fallthrough and raise from `src_err`
-        try:
-            _raise_from_unexpected_msg(
-                ctx=getattr(ipc, 'ctx', ipc),
-                msg=msg,
-                src_err=src_err,
-                log=log,
-                expect_msg=expect_msg,
-                hide_tb=hide_tb,
-            )
-        except UnboundLocalError:
-            # XXX if there's an internal lookup error in the above
-            # code (prolly on `src_err`) we want to show this frame
-            # in the tb!
-            __tracebackhide__: bool = False
-            raise
-
-    dec_msg = decode_pld
-
-    async def recv_msg_w_pld(
-        self,
-        ipc: Context|MsgStream,
-        expect_msg: MsgType,
-
-        # NOTE: generally speaking only for handling `Stop`-msgs that
-        # arrive during a call to `drain_to_final_msg()` above!
-        passthrough_non_pld_msgs: bool = True,
-        hide_tb: bool = True,
-        **kwargs,
-
-    ) -> tuple[MsgType, PayloadT]:
-        '''
-        Retrieve the next avail IPC msg, decode it's payload, and return
-        the pair of refs.
-
-        '''
-        __tracebackhide__: bool = hide_tb
-        msg: MsgType = await ipc._rx_chan.receive()
-
-        if passthrough_non_pld_msgs:
-            match msg:
-                case Stop():
-                    return msg, None
-
-        # TODO: is there some way we can inject the decoded
-        # payload into an existing output buffer for the original
-        # msg instance?
-        pld: PayloadT = self.decode_pld(
-            msg,
-            ipc=ipc,
-            expect_msg=expect_msg,
-            hide_tb=hide_tb,
-            **kwargs,
-        )
-        return msg, pld
-
-
-@cm
-def limit_plds(
-    spec: Union[Type[Struct]],
-    **dec_kwargs,
-
-) -> MsgDec:
-    '''
-    Apply a `MsgCodec` that will natively decode the SC-msg set's
-    `PayloadMsg.pld: Union[Type[Struct]]` payload fields using
-    tagged-unions of `msgspec.Struct`s from the `payload_types`
-    for all IPC contexts in use by the current `trio.Task`.
-
-    '''
-    __tracebackhide__: bool = True
-    try:
-        curr_ctx: Context = current_ipc_ctx()
-        rx: PldRx = curr_ctx._pld_rx
-        orig_pldec: MsgDec = rx.pld_dec
-
-        with rx.limit_plds(
-            spec=spec,
-            **dec_kwargs,
-        ) as pldec:
-            log.runtime(
-                'Applying payload-decoder\n\n'
-                f'{pldec}\n'
-            )
-            yield pldec
-    finally:
-        log.runtime(
-            'Reverted to previous payload-decoder\n\n'
-            f'{orig_pldec}\n'
-        )
-        # sanity on orig settings
-        assert rx.pld_dec is orig_pldec
-
-
-@acm
-async def maybe_limit_plds(
-    ctx: Context,
-    spec: Union[Type[Struct]]|None = None,
-    dec_hook: Callable|None = None,
-    **kwargs,
-
-) -> MsgDec|None:
-    '''
-    Async compat maybe-payload type limiter.
-
-    Mostly for use inside other internal `@acm`s such that a separate
-    indent block isn't needed when an async one is already being
-    used.
-
-    '''
-    if (
-        spec is None
-        and
-        dec_hook is None
-    ):
-        yield None
-        return
-
-    # sanity check on IPC scoping
-    curr_ctx: Context = current_ipc_ctx()
-    assert ctx is curr_ctx
-
-    with ctx._pld_rx.limit_plds(
-        spec=spec,
-        dec_hook=dec_hook,
-        **kwargs,
-    ) as msgdec:
-        yield msgdec
-
-    # when the applied spec is unwound/removed, the same IPC-ctx
-    # should still be in scope.
-    curr_ctx: Context = current_ipc_ctx()
-    assert ctx is curr_ctx
-
-
-async def drain_to_final_msg(
-    ctx: Context,
-
-    hide_tb: bool = True,
-    msg_limit: int = 6,
-
-) -> tuple[
-    Return|None,
-    list[MsgType]
-]:
-    '''
-    Drain IPC msgs delivered to the underlying IPC context's
-    rx-mem-chan (i.e. from `Context._rx_chan`) in search for a final
-    `Return` or `Error` msg.
-
-    Deliver the `Return` + preceding drained msgs (`list[MsgType]`)
-    as a pair unless an `Error` is found, in which unpack and raise
-    it.
-
-    The motivation here is to always capture any remote error relayed
-    by the remote peer task during a ctxc condition.
-
-    For eg. a ctxc-request may be sent to the peer as part of the
-    local task's (request for) cancellation but then that same task
-    **also errors** before executing the teardown in the
-    `Portal.open_context().__aexit__()` block. In such error-on-exit
-    cases we want to always capture and raise any delivered remote
-    error (like an expected ctxc-ACK) as part of the final
-    `ctx.wait_for_result()` teardown sequence such that the
-    `Context.outcome` related state always reflect what transpired
-    even after ctx closure and the `.open_context()` block exit.
-
-    '''
-    __tracebackhide__: bool = hide_tb
-    raise_overrun: bool = not ctx._allow_overruns
-
-    # wait for a final context result by collecting (but
-    # basically ignoring) any bi-dir-stream msgs still in transit
-    # from the far end.
-    pre_result_drained: list[MsgType] = []
-    result_msg: Return|Error|None = None
-    while not (
-        ctx.maybe_error
-        and not ctx._final_result_is_set()
-    ):
-        try:
-            # receive all msgs, scanning for either a final result
-            # or error; the underlying call should never raise any
-            # remote error directly!
-            msg, pld = await ctx._pld_rx.recv_msg_w_pld(
-                ipc=ctx,
-                expect_msg=Return,
-                raise_error=False,
-                hide_tb=hide_tb,
-            )
-            # ^-TODO-^ some bad ideas?
-            # -[ ] wrap final outcome .receive() in a scope so
-            #     it can be cancelled out of band if needed?
-            # |_with trio.CancelScope() as res_cs:
-            #       ctx._res_scope = res_cs
-            #       msg: dict = await ctx._rx_chan.receive()
-            #   if res_cs.cancelled_caught:
-            #
-            # -[ ] make sure pause points work here for REPLing
-            #   the runtime itself; i.e. ensure there's no hangs!
-            # |_from tractor.devx._debug import pause
-            #   await pause()
-
-        # NOTE: we get here if the far end was
-        # `ContextCancelled` in 2 cases:
-        # 1. we requested the cancellation and thus
-        #    SHOULD NOT raise that far end error,
-        # 2. WE DID NOT REQUEST that cancel and thus
-        #    SHOULD RAISE HERE!
-        except trio.Cancelled as _taskc:
-            taskc: trio.Cancelled = _taskc
-
-            # report when the cancellation wasn't (ostensibly) due to
-            # RPC operation, some surrounding parent cancel-scope.
-            if not ctx._scope.cancel_called:
-                task: trio.lowlevel.Task = trio.lowlevel.current_task()
-                rent_n: trio.Nursery = task.parent_nursery
-                if (
-                    (local_cs := rent_n.cancel_scope).cancel_called
-                ):
-                    log.cancel(
-                        'RPC-ctx cancelled by local-parent scope during drain!\n\n'
-                        f'c}}>\n'
-                        f' |_{rent_n}\n'
-                        f'   |_.cancel_scope = {local_cs}\n'
-                        f'   |_>c}}\n'
-                        f'      |_{ctx.pformat(indent=" "*9)}'
-                        # ^TODO, some (other) simpler repr here?
-                    )
-                    __tracebackhide__: bool = False
-
-            # CASE 2: mask the local cancelled-error(s)
-            # only when we are sure the remote error is
-            # the source cause of this local task's
-            # cancellation.
-            ctx.maybe_raise(
-                hide_tb=hide_tb,
-                from_src_exc=taskc,
-                # ?TODO? when *should* we use this?
-            )
-
-            # CASE 1: we DID request the cancel we simply
-            # continue to bubble up as normal.
-            raise taskc
-
-        match msg:
-
-            # final result arrived!
-            case Return():
-                log.runtime(
-                    'Context delivered final draining msg:\n'
-                    f'{pretty_struct.pformat(msg)}'
-                )
-                ctx._result: Any = pld
-                result_msg = msg
-                break
-
-            # far end task is still streaming to us so discard
-            # and report depending on local ctx state.
-            case Yield():
-                pre_result_drained.append(msg)
-                if (
-                    (ctx._stream.closed
-                     and (reason := 'stream was already closed')
-                    )
-                    or (ctx.cancel_acked
-                        and (reason := 'ctx cancelled other side')
-                    )
-                    or (ctx._cancel_called
-                        and (reason := 'ctx called `.cancel()`')
-                    )
-                    or (len(pre_result_drained) > msg_limit
-                        and (reason := f'"yield" limit={msg_limit}')
-                    )
-                ):
-                    log.cancel(
-                        'Cancelling `MsgStream` drain since '
-                        f'{reason}\n\n'
-                        f'<= {ctx.chan.uid}\n'
-                        f'  |_{ctx._nsf}()\n\n'
-                        f'=> {ctx._task}\n'
-                        f'  |_{ctx._stream}\n\n'
-
-                        f'{pretty_struct.pformat(msg)}\n'
-                    )
-                    break
-
-                # drain up to the `msg_limit` hoping to get
-                # a final result or error/ctxc.
-                else:
-                    log.warning(
-                        'Ignoring "yield" msg during `ctx.result()` drain..\n'
-                        f'<= {ctx.chan.uid}\n'
-                        f'  |_{ctx._nsf}()\n\n'
-                        f'=> {ctx._task}\n'
-                        f'  |_{ctx._stream}\n\n'
-
-                        f'{pretty_struct.pformat(msg)}\n'
-                    )
-                    continue
-
-            # stream terminated, but no result yet..
-            #
-            # TODO: work out edge cases here where
-            # a stream is open but the task also calls
-            # this?
-            # -[ ] should be a runtime error if a stream is open right?
-            # Stop()
-            case Stop():
-                pre_result_drained.append(msg)
-                log.runtime(  # normal/expected shutdown transaction
-                    'Remote stream terminated due to "stop" msg:\n\n'
-                    f'{pretty_struct.pformat(msg)}\n'
-                )
-                continue
-
-            # remote error msg, likely already handled inside
-            # `Context._deliver_msg()`
-            case Error():
-                # TODO: can we replace this with `ctx.maybe_raise()`?
-                # -[ ]  would this be handier for this case maybe?
-                # |_async with maybe_raise_on_exit() as raises:
-                #       if raises:
-                #           log.error('some msg about raising..')
-                #
-                re: Exception|None = ctx._remote_error
-                if re:
-                    assert msg is ctx._cancel_msg
-                    # NOTE: this solved a super duper edge case XD
-                    # this was THE super duper edge case of:
-                    # - local task opens a remote task,
-                    # - requests remote cancellation of far end
-                    #   ctx/tasks,
-                    # - needs to wait for the cancel ack msg
-                    #   (ctxc) or some result in the race case
-                    #   where the other side's task returns
-                    #   before the cancel request msg is ever
-                    #   rxed and processed,
-                    # - here this surrounding drain loop (which
-                    #   iterates all ipc msgs until the ack or
-                    #   an early result arrives) was NOT exiting
-                    #   since we are the edge case: local task
-                    #   does not re-raise any ctxc it receives
-                    #   IFF **it** was the cancellation
-                    #   requester..
-                    #
-                    # XXX will raise if necessary but ow break
-                    # from loop presuming any supressed error
-                    # (ctxc) should terminate the context!
-                    ctx._maybe_raise_remote_err(
-                        re,
-                        # NOTE: obvi we don't care if we
-                        # overran the far end if we're already
-                        # waiting on a final result (msg).
-                        # raise_overrun_from_self=False,
-                        raise_overrun_from_self=raise_overrun,
-                    )
-                    result_msg = msg
-                    break  # OOOOOF, yeah obvi we need this..
-
-                else:
-                    # bubble the original src key error
-                    raise
-
-            # XXX should pretty much never get here unless someone
-            # overrides the default `MsgType` spec.
-            case _:
-                pre_result_drained.append(msg)
-                # It's definitely an internal error if any other
-                # msg type without a`'cid'` field arrives here!
-                report: str = (
-                    f'Invalid or unknown msg type {type(msg)!r}!?\n'
-                )
-                if not msg.cid:
-                    report += (
-                        '\nWhich also has no `.cid` field?\n'
-                    )
-
-                raise MessagingError(
-                    report
-                    +
-                    f'\n{msg}\n'
-                )
-
-    else:
-        log.cancel(
-            'Skipping `MsgStream` drain since final outcome is set\n\n'
-            f'{ctx.outcome}\n'
-        )
-
-    return (
-        result_msg,
-        pre_result_drained,
-    )
-
-
-def validate_payload_msg(
-    pld_msg: Started|Yield|Return,
-    pld_value: PayloadT,
-    ipc: Context|MsgStream,
-
-    raise_mte: bool = True,
-    strict_pld_parity: bool = False,
-    hide_tb: bool = True,
-
-) -> MsgTypeError|None:
-    '''
-    Validate a `PayloadMsg.pld` value with the current
-    IPC ctx's `PldRx` and raise an appropriate `MsgTypeError`
-    on failure.
-
-    '''
-    __tracebackhide__: bool = hide_tb
-    codec: MsgCodec = current_codec()
-    msg_bytes: bytes = codec.encode(pld_msg)
-    try:
-        roundtripped: Started = codec.decode(msg_bytes)
-        ctx: Context = getattr(ipc, 'ctx', ipc)
-        pld: PayloadT = ctx.pld_rx.decode_pld(
-            msg=roundtripped,
-            ipc=ipc,
-            expect_msg=Started,
-            hide_tb=hide_tb,
-            is_started_send_side=True,
-        )
-        if (
-            strict_pld_parity
-            and
-            pld != pld_value
-        ):
-            # TODO: make that one a mod func too..
-            diff = pretty_struct.Struct.__sub__(
-                roundtripped,
-                pld_msg,
-            )
-            complaint: str = (
-                'Started value does not match after roundtrip?\n\n'
-                f'{diff}'
-            )
-            raise ValidationError(complaint)
-
-    # raise any msg type error NO MATTER WHAT!
-    except ValidationError as verr:
-        try:
-            mte: MsgTypeError = _mk_recv_mte(
-                msg=roundtripped,
-                codec=codec,
-                src_validation_error=verr,
-                verb_header='Trying to send ',
-                is_invalid_payload=True,
-            )
-        except BaseException:
-            __tracebackhide__: bool = False
-            raise
-
-        if not raise_mte:
-            return mte
-
-        raise mte from verr

tractor/msg/pretty_struct.py

@@ -1,292 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-'''
-Prettified version of `msgspec.Struct` for easier console grokin.
-
-'''
-from __future__ import annotations
-from collections import UserList
-from typing import (
-    Any,
-    Iterator,
-)
-
-from msgspec import (
-    msgpack,
-    Struct as _Struct,
-    structs,
-)
-from pprint import (
-    saferepr,
-)
-
-from tractor.log import get_logger
-
-log = get_logger()
-# TODO: auto-gen type sig for input func both for
-# type-msgs and logging of RPC tasks?
-# taken and modified from:
-# https://stackoverflow.com/a/57110117
-# import inspect
-# from typing import List
-
-# def my_function(input_1: str, input_2: int) -> list[int]:
-#     pass
-
-# def types_of(func):
-#     specs = inspect.getfullargspec(func)
-#     return_type = specs.annotations['return']
-#     input_types = [t.__name__ for s, t in specs.annotations.items() if s != 'return']
-#     return f'{func.__name__}({": ".join(input_types)}) -> {return_type}'
-
-# types_of(my_function)
-
-
-class DiffDump(UserList):
-    '''
-    Very simple list delegator that repr() dumps (presumed) tuple
-    elements of the form `tuple[str, Any, Any]` in a nice
-    multi-line readable form for analyzing `Struct` diffs.
-
-    '''
-    def __repr__(self) -> str:
-        if not len(self):
-            return super().__repr__()
-
-        # format by displaying item pair's ``repr()`` on multiple,
-        # indented lines such that they are more easily visually
-        # comparable when printed to console when printed to
-        # console.
-        repstr: str = '[\n'
-        for k, left, right in self:
-            repstr += (
-                f'({k},\n'
-                f'\t{repr(left)},\n'
-                f'\t{repr(right)},\n'
-                ')\n'
-            )
-        repstr += ']\n'
-        return repstr
-
-
-def iter_fields(struct: Struct) -> Iterator[
-    tuple[
-        structs.FieldIinfo,
-        str,
-        Any,
-    ]
-]:
-    '''
-    Iterate over all non-@property fields of this struct.
-
-    '''
-    fi: structs.FieldInfo
-    for fi in structs.fields(struct):
-        key: str = fi.name
-        val: Any = getattr(struct, key)
-        yield (
-            fi,
-            key,
-            val,
-        )
-
-
-def pformat(
-    struct: Struct,
-    field_indent: int = 2,
-    indent: int = 0,
-
-) -> str:
-    '''
-    Recursion-safe `pprint.pformat()` style formatting of
-    a `msgspec.Struct` for sane reading by a human using a REPL.
-
-    '''
-    # global whitespace indent
-    ws: str = ' '*indent
-
-    # field whitespace indent
-    field_ws: str = ' '*(field_indent + indent)
-
-    # qtn: str = ws + struct.__class__.__qualname__
-    qtn: str = struct.__class__.__qualname__
-
-    obj_str: str = ''  # accumulator
-    fi: structs.FieldInfo
-    k: str
-    v: Any
-    for fi, k, v in iter_fields(struct):
-
-        # TODO: how can we prefer `Literal['option1',  'option2,
-        # ..]` over .__name__ == `Literal` but still get only the
-        # latter for simple types like `str | int | None` etc..?
-        ft: type = fi.type
-        typ_name: str = getattr(ft, '__name__', str(ft))
-
-        # recurse to get sub-struct's `.pformat()` output Bo
-        if isinstance(v, Struct):
-            val_str: str =  v.pformat(
-                indent=field_indent + indent,
-                field_indent=indent + field_indent,
-            )
-
-        else:  # the `pprint` recursion-safe format:
-            # https://docs.python.org/3.11/library/pprint.html#pprint.saferepr
-            try:
-                val_str: str = saferepr(v)
-            except Exception:
-                log.exception(
-                    'Failed to `saferepr({type(struct)})` !?\n'
-                )
-            return _Struct.__repr__(struct)
-
-        # TODO: LOLOL use `textwrap.indent()` instead dawwwwwg!
-        obj_str += (field_ws + f'{k}: {typ_name} = {val_str},\n')
-
-    return (
-        f'{qtn}(\n'
-        f'{obj_str}'
-        f'{ws})'
-    )
-
-
-class Struct(
-    _Struct,
-
-    # https://jcristharif.com/msgspec/structs.html#tagged-unions
-    # tag='pikerstruct',
-    # tag=True,
-):
-    '''
-    A "human friendlier" (aka repl buddy) struct subtype.
-
-    '''
-    def to_dict(
-        self,
-        include_non_members: bool = True,
-
-    ) -> dict:
-        '''
-        Like it sounds.. direct delegation to:
-        https://jcristharif.com/msgspec/api.html#msgspec.structs.asdict
-
-        BUT, by default we pop all non-member (aka not defined as
-        struct fields) fields by default.
-
-        '''
-        asdict: dict = structs.asdict(self)
-        if include_non_members:
-            return asdict
-
-        # only return a dict of the struct members
-        # which were provided as input, NOT anything
-        # added as type-defined `@property` methods!
-        sin_props: dict = {}
-        fi: structs.FieldInfo
-        for fi, k, v in iter_fields(self):
-            sin_props[k] = asdict[k]
-
-        return sin_props
-
-    pformat = pformat
-    # __repr__ = pformat
-    # __str__ = __repr__ = pformat
-    # TODO: use a pprint.PrettyPrinter instance around ONLY rendering
-    # inside a known tty?
-    # def __repr__(self) -> str:
-    #     ...
-    def __repr__(self) -> str:
-        try:
-            return pformat(self)
-        except Exception:
-            log.exception(
-                f'Failed to `pformat({type(self)})` !?\n'
-            )
-            return _Struct.__repr__(self)
-
-    def copy(
-        self,
-        update: dict | None = None,
-
-    ) -> Struct:
-        '''
-        Validate-typecast all self defined fields, return a copy of
-        us with all such fields.
-
-        NOTE: This is kinda like the default behaviour in
-        `pydantic.BaseModel` except a copy of the object is
-        returned making it compat with `frozen=True`.
-
-        '''
-        if update:
-            for k, v in update.items():
-                setattr(self, k, v)
-
-        # NOTE: roundtrip serialize to validate
-        # - enode to msgpack binary format,
-        # - decode that back to a struct.
-        return msgpack.Decoder(type=type(self)).decode(
-            msgpack.Encoder().encode(self)
-        )
-
-    def typecast(
-        self,
-
-        # TODO: allow only casting a named subset?
-        # fields: set[str] | None = None,
-
-    ) -> None:
-        '''
-        Cast all fields using their declared type annotations
-        (kinda like what `pydantic` does by default).
-
-        NOTE: this of course won't work on frozen types, use
-        ``.copy()`` above in such cases.
-
-        '''
-        # https://jcristharif.com/msgspec/api.html#msgspec.structs.fields
-        fi: structs.FieldInfo
-        for fi in structs.fields(self):
-            setattr(
-                self,
-                fi.name,
-                fi.type(getattr(self, fi.name)),
-            )
-
-    def __sub__(
-        self,
-        other: Struct,
-
-    ) -> DiffDump[tuple[str, Any, Any]]:
-        '''
-        Compare fields/items key-wise and return a ``DiffDump``
-        for easy visual REPL comparison B)
-
-        '''
-        diffs: DiffDump[tuple[str, Any, Any]] = DiffDump()
-        for fi in structs.fields(self):
-            attr_name: str = fi.name
-            ours: Any = getattr(self, attr_name)
-            theirs: Any = getattr(other, attr_name)
-            if ours != theirs:
-                diffs.append((
-                    attr_name,
-                    ours,
-                    theirs,
-                ))
-
-        return diffs

tractor/msg/ptr.py

@@ -1,139 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-'''
-IPC-compat cross-mem-boundary object pointer.
-
-'''
-
-# TODO: integration with our ``enable_modules: list[str]`` caps sys.
-
-# ``pkgutil.resolve_name()`` internally uses
-# ``importlib.import_module()`` which can be filtered by inserting
-# a ``MetaPathFinder`` into ``sys.meta_path`` (which we could do before
-# entering the ``_runtime.process_messages()`` loop).
-# - https://github.com/python/cpython/blob/main/Lib/pkgutil.py#L645
-# - https://stackoverflow.com/questions/1350466/preventing-python-code-from-importing-certain-modules
-#   - https://stackoverflow.com/a/63320902
-#   - https://docs.python.org/3/library/sys.html#sys.meta_path
-
-# the new "Implicit Namespace Packages" might be relevant?
-# - https://www.python.org/dev/peps/pep-0420/
-
-# add implicit serialized message type support so that paths can be
-# handed directly to IPC primitives such as streams and `Portal.run()`
-# calls:
-# - via ``msgspec``:
-#   - https://jcristharif.com/msgspec/api.html#struct
-#   - https://jcristharif.com/msgspec/extending.html
-# via ``msgpack-python``:
-# - https://github.com/msgpack/msgpack-python#packingunpacking-of-custom-data-type
-
-from __future__ import annotations
-from inspect import (
-    isfunction,
-    ismethod,
-)
-from pkgutil import resolve_name
-
-
-class NamespacePath(str):
-    '''
-    A serializeable `str`-subtype implementing a "namespace
-    pointer" to any Python object reference (like a function)
-    using the same format as the built-in `pkgutil.resolve_name()`
-    system.
-
-    A value describes a target's module-path and namespace-key
-    separated by a ':' and thus can be easily used as
-    a IPC-message-native reference-type allowing memory isolated
-    actors to point-and-load objects via a minimal `str` value.
-
-    '''
-    _ref: object | type | None = None
-
-    # TODO: support providing the ns instance in
-    # order to support 'self.<meth>` style to make
-    # `Portal.run_from_ns()` work!
-    # _ns: ModuleType|type|None = None
-
-    def load_ref(self) -> object | type:
-        if self._ref is None:
-            self._ref = resolve_name(self)
-        return self._ref
-
-    @staticmethod
-    def _mk_fqnp(
-        ref: type|object,
-    ) -> tuple[str, str]:
-        '''
-        Generate a minial `str` pair which describes a python
-        object's namespace path and object/type name.
-
-        In more precise terms something like:
-          - 'py.namespace.path:object_name',
-          - eg.'tractor.msg:NamespacePath' will be the ``str`` form
-            of THIS type XD
-
-        '''
-        if isfunction(ref):
-            name: str = getattr(ref, '__name__')
-            mod_name: str = ref.__module__
-
-        elif ismethod(ref):
-            # build out the path manually i guess..?
-            # TODO: better way?
-            name: str = '.'.join([
-                type(ref.__self__).__name__,
-                ref.__func__.__name__,
-            ])
-            mod_name: str = ref.__self__.__module__
-
-        else:  # object or other?
-            # isinstance(ref, object)
-            # and not isfunction(ref)
-            name: str = type(ref).__name__
-            mod_name: str = ref.__module__
-
-        # TODO: return static value direactly?
-        #
-        # fully qualified namespace path, tuple.
-        fqnp: tuple[str, str] = (
-            mod_name,
-            name,
-        )
-        return fqnp
-
-    @classmethod
-    def from_ref(
-        cls,
-        ref: type|object,
-
-    ) -> NamespacePath:
-
-        fqnp: tuple[str, str] = cls._mk_fqnp(ref)
-        return cls(':'.join(fqnp))
-
-    def to_tuple(
-        self,
-
-        # TODO: could this work re `self:<meth>` case from above?
-        # load_ref: bool = True,
-
-    ) -> tuple[str, str]:
-        return self._mk_fqnp(
-            self.load_ref()
-        )

tractor/msg/types.py

@@ -1,730 +0,0 @@
-# tractor: structured concurrent "actors".
-# Copyright 2018-eternity Tyler Goodlet.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-'''
-Define our strictly typed IPC message spec for the SCIPP:
-
-that is,
-
-the "Structurred-Concurrency-Inter-Process-(dialog)-(un)Protocol".
-
-'''
-from __future__ import annotations
-import types
-from typing import (
-    Any,
-    Generic,
-    Literal,
-    Type,
-    TypeVar,
-    TypeAlias,
-    Union,
-)
-
-from msgspec import (
-    defstruct,
-    # field,
-    Raw,
-    Struct,
-    # UNSET,
-    # UnsetType,
-)
-
-from tractor.msg import (
-    pretty_struct,
-)
-from tractor.log import get_logger
-
-
-log = get_logger('tractor.msgspec')
-
-# type variable for the boxed payload field `.pld`
-PayloadT = TypeVar('PayloadT')
-
-
-class PayloadMsg(
-    Struct,
-    Generic[PayloadT],
-
-    # https://jcristharif.com/msgspec/structs.html#tagged-unions
-    tag=True,
-    tag_field='msg_type',
-
-    # https://jcristharif.com/msgspec/structs.html#field-ordering
-    # kw_only=True,
-
-    # https://jcristharif.com/msgspec/structs.html#equality-and-order
-    # order=True,
-
-    # https://jcristharif.com/msgspec/structs.html#encoding-decoding-as-arrays
-    # as_array=True,
-):
-    '''
-    An abstract payload boxing/shuttling IPC msg type.
-
-    Boxes data-values passed to/from user code
-
-    (i.e. any values passed by `tractor` application code using any of
-
-      |_ `._streaming.MsgStream.send/receive()`
-      |_ `._context.Context.started/result()`
-      |_ `._ipc.Channel.send/recv()`
-
-     aka our "IPC primitive APIs")
-
-    as message "payloads" set to the `.pld` field and uses
-    `msgspec`'s "tagged unions" feature to support a subset of our
-    "SC-transitive shuttle protocol" specification with
-    a `msgspec.Struct` inheritance tree.
-
-    '''
-    cid: str  # call/context-id
-    # ^-TODO-^: more explicit type?
-    # -[ ] use UNSET here?
-    #  https://jcristharif.com/msgspec/supported-types.html#unset
-    #
-    # -[ ] `uuid.UUID` which has multi-protocol support
-    #  https://jcristharif.com/msgspec/supported-types.html#uuid
-
-    # The msg's "payload" (spelled without vowels):
-    # https://en.wikipedia.org/wiki/Payload_(computing)
-    pld: Raw
-
-    # ^-NOTE-^ inherited from any `PayloadMsg` (and maybe type
-    # overriden via the `._ops.limit_plds()` API), but by default is
-    # parameterized to be `Any`.
-    #
-    # XXX this `Union` must strictly NOT contain `Any` if
-    # a limited msg-type-spec is intended, such that when
-    # creating and applying a new `MsgCodec` its 
-    # `.decoder: Decoder` is configured with a `Union[Type[Struct]]` which
-    # restricts the allowed payload content (this `.pld` field) 
-    # by type system defined loading constraints B)
-    #
-    # TODO: could also be set to `msgspec.Raw` if the sub-decoders
-    # approach is preferred over the generic parameterization 
-    # approach as take by `mk_msg_spec()` below.
-
-
-# TODO: complete rename
-Msg = PayloadMsg
-
-
-class Aid(
-    Struct,
-    tag=True,
-    tag_field='msg_type',
-):
-    '''
-    Actor-identity msg.
-
-    Initial contact exchange enabling an actor "mailbox handshake"
-    delivering the peer identity (and maybe eventually contact)
-    info.
-
-    Used by discovery protocol to register actors as well as
-    conduct the initial comms (capability) filtering.
-
-    '''
-    name: str
-    uuid: str
-    # TODO: use built-in support for UUIDs?
-    # -[ ] `uuid.UUID` which has multi-protocol support
-    #  https://jcristharif.com/msgspec/supported-types.html#uuid
-
-
-class SpawnSpec(
-    pretty_struct.Struct,
-    tag=True,
-    tag_field='msg_type',
-):
-    '''
-    Initial runtime spec handed down from a spawning parent to its
-    child subactor immediately following first contact via an
-    `Aid` msg.
-
-    '''
-    # TODO: similar to the `Start` kwargs spec needed below, we need
-    # a hard `Struct` def for all of these fields!
-    _parent_main_data: dict
-    _runtime_vars: dict[str, Any]
-
-    # module import capability
-    enable_modules: dict[str, str]
-
-    # TODO: not just sockaddr pairs?
-    # -[ ] abstract into a `TransportAddr` type?
-    reg_addrs: list[tuple[str, int]]
-    bind_addrs: list[tuple[str, int]]
-
-
-# TODO: caps based RPC support in the payload?
-#
-# -[ ] integration with our ``enable_modules: list[str]`` caps sys.
-#   ``pkgutil.resolve_name()`` internally uses
-#   ``importlib.import_module()`` which can be filtered by
-#   inserting a ``MetaPathFinder`` into ``sys.meta_path`` (which
-#   we could do before entering the ``Actor._process_messages()``
-#   loop)?
-#   - https://github.com/python/cpython/blob/main/Lib/pkgutil.py#L645
-#   - https://stackoverflow.com/questions/1350466/preventing-python-code-from-importing-certain-modules
-#   - https://stackoverflow.com/a/63320902
-#   - https://docs.python.org/3/library/sys.html#sys.meta_path
-#
-# -[ ] can we combine .ns + .func into a native `NamespacePath` field?
-#
-# -[ ] better name, like `Call/TaskInput`?
-#
-# -[ ] XXX a debugger lock msg transaction with payloads like,
-#   child -> `.pld: DebugLock` -> root
-#   child <- `.pld: DebugLocked` <- root
-#   child -> `.pld: DebugRelease` -> root
-#
-#   WHY => when a pld spec is provided it might not allow for
-#   debug mode msgs as they currently are (using plain old `pld.
-#   str` payloads) so we only when debug_mode=True we need to
-#   union in this debugger payload set?
-#
-#   mk_msg_spec(
-#       MyPldSpec,
-#       debug_mode=True,
-#   ) -> (
-#       Union[MyPldSpec]
-#      | Union[DebugLock, DebugLocked, DebugRelease]
-#   )
-
-# class Params(
-#     Struct,
-#     Generic[PayloadT],
-# ):
-#     spec: PayloadT|ParamSpec
-#     inputs: InputsT|dict[str, Any]
-
-    # TODO: for eg. we could stringently check the target
-    # task-func's type sig and enforce it?
-    # as an example for an IPTC,
-    # @tractor.context
-    # async def send_back_nsp(
-    #     ctx: Context,
-    #     expect_debug: bool,
-    #     pld_spec_str: str,
-    #     add_hooks: bool,
-    #     started_msg_dict: dict,
-    # ) -> <WhatHere!>:
-
-    # TODO: figure out which of the `typing` feats we want to
-    # support:
-    # - plain ol `ParamSpec`:
-    #   https://docs.python.org/3/library/typing.html#typing.ParamSpec
-    # - new in 3.12 type parameter lists Bo
-    # |_ https://docs.python.org/3/reference/compound_stmts.html#type-params
-    # |_ historical pep 695: https://peps.python.org/pep-0695/
-    # |_ full lang spec: https://typing.readthedocs.io/en/latest/spec/
-    # |_ on annotation scopes:
-    #    https://docs.python.org/3/reference/executionmodel.html#annotation-scopes
-    # spec: ParamSpec[
-    #     expect_debug: bool,
-    #     pld_spec_str: str,
-    #     add_hooks: bool,
-    #     started_msg_dict: dict,
-    # ]
-
-
-# TODO: possibly sub-type for runtime method requests?
-# -[ ] `Runtime(Start)` with a `.ns: str = 'self' or
-#     we can just enforce any such method as having a strict
-#     ns for calling funcs, namely the `Actor` instance?
-class Start(
-    Struct,
-    tag=True,
-    tag_field='msg_type',
-):
-    '''
-    Initial request to remotely schedule an RPC `trio.Task` via
-    `Actor.start_remote_task()`.
-
-    It is called by all the following public APIs:
-
-    - `ActorNursery.run_in_actor()`
-
-    - `Portal.run()`
-          `|_.run_from_ns()`
-          `|_.open_stream_from()`
-          `|_._submit_for_result()`
-
-    - `Context.open_context()`
-
-    '''
-    cid: str
-
-    ns: str
-    func: str
-
-    # TODO: make this a sub-struct which can be further
-    # type-limited, maybe `Inputs`?
-    # => SEE ABOVE <=
-    kwargs: dict[str, Any]
-    uid: tuple[str, str]  # (calling) actor-id
-
-    # TODO: enforcing a msg-spec in terms `Msg.pld`
-    # parameterizable msgs to be used in the appls IPC dialog.
-    # => SEE `._codec.MsgDec` for more <=
-    pld_spec: str = str(Any)
-
-
-class StartAck(
-    Struct,
-    tag=True,
-    tag_field='msg_type',
-):
-    '''
-    Init response to a `Cmd` request indicating the far
-    end's RPC spec, namely its callable "type".
-
-    '''
-    cid: str
-    # TODO: maybe better names for all these?
-    # -[ ] obvi ^ would need sync with `._rpc`
-    functype: Literal[
-        'asyncfunc',
-        'asyncgen',
-        'context',  # TODO: the only one eventually?
-    ]
-
-    # import typing
-    # eval(str(Any), {}, {'typing': typing})
-    # started_spec: str = str(Any)
-    # return_spec
-
-
-class Started(
-    PayloadMsg,
-    Generic[PayloadT],
-):
-    '''
-    Packet to shuttle the "first value" delivered by
-    `Context.started(value: Any)` from a `@tractor.context`
-    decorated IPC endpoint.
-
-    '''
-    pld: PayloadT|Raw
-
-
-# TODO: cancel request dedicated msg?
-# -[ ] instead of using our existing `Start`?
-#
-# class Cancel:
-#     cid: str
-
-
-class Yield(
-    PayloadMsg,
-    Generic[PayloadT],
-):
-    '''
-    Per IPC transmission of a value from `await MsgStream.send(<value>)`.
-
-    '''
-    pld: PayloadT|Raw
-
-
-class Stop(
-    Struct,
-    tag=True,
-    tag_field='msg_type',
-):
-    '''
-    Stream termination signal much like an IPC version 
-    of `StopAsyncIteration`.
-
-    '''
-    cid: str
-    # TODO: do we want to support a payload on stop?
-    # pld: UnsetType = UNSET
-
-
-# TODO: is `Result` or `Out[come]` a better name?
-class Return(
-    PayloadMsg,
-    Generic[PayloadT],
-):
-    '''
-    Final `return <value>` from a remotely scheduled
-    func-as-`trio.Task`.
-
-    '''
-    pld: PayloadT|Raw
-
-
-class CancelAck(
-    PayloadMsg,
-    Generic[PayloadT],
-):
-    '''
-    Deliver the `bool` return-value from a cancellation `Actor`
-    method scheduled via and prior RPC request.
-
-    - `Actor.cancel()`
-       `|_.cancel_soon()`
-       `|_.cancel_rpc_tasks()`
-       `|_._cancel_task()`
-       `|_.cancel_server()`
-
-    RPCs to these methods must **always** be able to deliver a result
-    despite the currently configured IPC msg spec such that graceful
-    cancellation is always functional in the runtime.
-
-    '''
-    pld: bool
-
-
-# TODO: unify this with `._exceptions.RemoteActorError`
-# such that we can have a msg which is both raisable and
-# IPC-wire ready?
-# B~o
-class Error(
-    Struct,
-    tag=True,
-    tag_field='msg_type',
-
-    # TODO may omit defaults?
-    # https://jcristharif.com/msgspec/structs.html#omitting-default-values
-    # omit_defaults=True,
-):
-    '''
-    A pkt that wraps `RemoteActorError`s for relay and raising.
-
-    Fields are 1-to-1 meta-data as needed originally by
-    `RemoteActorError.msgdata: dict` but now are defined here.
-
-    Note: this msg shuttles `ContextCancelled` and `StreamOverrun`
-    as well is used to rewrap any `MsgTypeError` for relay-reponse
-    to bad `Yield.pld` senders during an IPC ctx's streaming dialog
-    phase.
-
-    '''
-    src_uid: tuple[str, str]
-    src_type_str: str
-    boxed_type_str: str
-    relay_path: list[tuple[str, str]]
-
-    # normally either both are provided or just
-    # a message for certain special cases where
-    # we pack a message for a locally raised
-    # mte or ctxc.
-    message: str|None = None
-    tb_str: str = ''
-
-    # TODO: only optionally include sub-type specfic fields?
-    # -[ ] use UNSET or don't include them via `omit_defaults` (see
-    #      inheritance-line options above)
-    #
-    # `ContextCancelled` reports the src cancelling `Actor.uid`
-    canceller: tuple[str, str]|None = None
-
-    # `StreamOverrun`-specific src `Actor.uid`
-    sender: tuple[str, str]|None = None
-
-    # `MsgTypeError` meta-data
-    cid: str|None = None
-    # when the receiver side fails to decode a delivered
-    # `PayloadMsg`-subtype; one and/or both the msg-struct instance
-    # and `Any`-decoded to `dict` of the msg are set and relayed
-    # (back to the sender) for introspection.
-    _bad_msg: Started|Yield|Return|None = None
-    _bad_msg_as_dict: dict|None = None
-
-
-def from_dict_msg(
-    dict_msg: dict,
-
-    msgT: MsgType|None = None,
-    tag_field: str = 'msg_type',
-    use_pretty: bool = False,
-
-) -> MsgType:
-    '''
-    Helper to build a specific `MsgType` struct from a "vanilla"
-    decoded `dict`-ified equivalent of the msg: i.e. if the
-    `msgpack.Decoder.type == Any`, the default when using
-    `msgspec.msgpack` and not "typed decoding" using
-    `msgspec.Struct`.
-
-    '''
-    msg_type_tag_field: str = (
-        msgT.__struct_config__.tag_field
-        if msgT is not None
-        else tag_field
-    )
-    # XXX ensure tag field is removed
-    msgT_name: str = dict_msg.pop(msg_type_tag_field)
-    msgT: MsgType = _msg_table[msgT_name]
-    if use_pretty:
-        msgT = defstruct(
-            name=msgT_name,
-            fields=[
-                (key, fi.type)
-                for fi, key, _
-                in pretty_struct.iter_fields(msgT)
-            ],
-            bases=(
-                pretty_struct.Struct,
-                msgT,
-            ),
-        )
-    return msgT(**dict_msg)
-
-# TODO: should be make a set of cancel msgs?
-# -[ ] a version of `ContextCancelled`?
-#     |_ and/or with a scope field?
-# -[ ] or, a full `ActorCancelled`?
-#
-# class Cancelled(MsgType):
-#     cid: str
-#
-# -[ ] what about overruns?
-#
-# class Overrun(MsgType):
-#     cid: str
-
-_runtime_msgs: list[Struct] = [
-
-    # identity handshake on first IPC `Channel` contact.
-    Aid,
-
-    # parent-to-child spawn specification passed as 2nd msg after
-    # handshake ONLY after child connects back to parent.
-    SpawnSpec,
-
-    # inter-actor RPC initiation
-    Start,  # schedule remote task-as-func
-    StartAck,  # ack the schedule request
-
-    # emission from `MsgStream.aclose()`
-    Stop,
-
-    # `Return` sub-type that we always accept from
-    # runtime-internal cancel endpoints
-    CancelAck,
-
-    # box remote errors, normally subtypes
-    # of `RemoteActorError`.
-    Error,
-]
-
-# the no-outcome-yet IAC (inter-actor-communication) sub-set which
-# can be `PayloadMsg.pld` payload field type-limited by application code
-# using `apply_codec()` and `limit_msg_spec()`.
-_payload_msgs: list[PayloadMsg] = [
-    # first <value> from `Context.started(<value>)`
-    Started,
-
-    # any <value> sent via `MsgStream.send(<value>)`
-    Yield,
-
-    # the final value returned from a `@context` decorated
-    # IPC endpoint.
-    Return,
-]
-
-# built-in SC shuttle protocol msg type set in
-# approx order of the IPC txn-state spaces.
-__msg_types__: list[MsgType] = (
-    _runtime_msgs
-    +
-    _payload_msgs
-)
-
-
-_msg_table: dict[str, MsgType] = {
-    msgT.__name__: msgT
-    for msgT in __msg_types__
-}
-
-# TODO: use new type declaration syntax for msg-type-spec
-# https://docs.python.org/3/library/typing.html#type-aliases
-# https://docs.python.org/3/reference/simple_stmts.html#type
-MsgType: TypeAlias = Union[*__msg_types__]
-
-
-def mk_msg_spec(
-    payload_type_union: Union[Type] = Any,
-
-    spec_build_method: Literal[
-        'indexed_generics',  # works
-        'defstruct',
-        'types_new_class',
-
-    ] = 'indexed_generics',
-
-) -> tuple[
-    Union[MsgType],
-    list[MsgType],
-]:
-    '''
-    Create a payload-(data-)type-parameterized IPC message specification.
-
-    Allows generating IPC msg types from the above builtin set
-    with a payload (field) restricted data-type, the `Msg.pld: PayloadT`.
-
-    This allows runtime-task contexts to use the python type system
-    to limit/filter payload values as determined by the input
-    `payload_type_union: Union[Type]`.
-
-    Notes: originally multiple approaches for constructing the
-    type-union passed to `msgspec` were attempted as selected via the
-    `spec_build_method`, but it turns out only the defaul method
-    'indexed_generics' seems to work reliably in all use cases. As
-    such, the others will likely be removed in the near future.
-
-    '''
-    submsg_types: list[MsgType] = Msg.__subclasses__()
-    bases: tuple = (
-        # XXX NOTE XXX the below generic-parameterization seems to
-        # be THE ONLY way to get this to work correctly in terms
-        # of getting ValidationError on a roundtrip?
-        Msg[payload_type_union],
-        Generic[PayloadT],
-    )
-    defstruct_bases: tuple = (
-        Msg, # [payload_type_union],
-        # Generic[PayloadT],
-        # ^-XXX-^: not allowed? lul..
-    )
-    ipc_msg_types: list[Msg] = []
-
-    idx_msg_types: list[Msg] = []
-    defs_msg_types: list[Msg] = []
-    nc_msg_types: list[Msg] = []
-
-    for msgtype in __msg_types__:
-
-        # for the NON-payload (user api) type specify-able
-        # msgs types, we simply aggregate the def as is
-        # for inclusion in the output type `Union`.
-        if msgtype not in _payload_msgs:
-            ipc_msg_types.append(msgtype)
-            continue
-
-        # check inheritance sanity
-        assert msgtype in submsg_types
-
-        # TODO: wait why do we need the dynamic version here?
-        # XXX ANSWER XXX -> BC INHERITANCE.. don't work w generics..
-        #
-        # NOTE previously bc msgtypes WERE NOT inheritting
-        # directly the `Generic[PayloadT]` type, the manual method
-        # of generic-paraming with `.__class_getitem__()` wasn't
-        # working..
-        #
-        # XXX but bc i changed that to make every subtype inherit
-        # it, this manual "indexed parameterization" method seems
-        # to work?
-        #
-        # -[x] paraming the `PayloadT` values via `Generic[T]`
-        #   does work it seems but WITHOUT inheritance of generics
-        #
-        # -[-] is there a way to get it to work at module level
-        #   just using inheritance or maybe a metaclass?
-        #  => thot that `defstruct` might work, but NOPE, see
-        #   below..
-        #
-        idxed_msg_type: Msg = msgtype[payload_type_union]
-        idx_msg_types.append(idxed_msg_type)
-
-        # TODO: WHY do we need to dynamically generate the
-        # subtype-msgs here to ensure the `.pld` parameterization
-        # propagates as well as works at all in terms of the
-        # `msgpack.Decoder()`..?
-        #
-        # dynamically create the payload type-spec-limited msg set.
-        newclass_msgtype: Type = types.new_class(
-            name=msgtype.__name__,
-            bases=bases,
-            kwds={},
-        )
-        nc_msg_types.append(
-            newclass_msgtype[payload_type_union]
-        )
-
-        # with `msgspec.structs.defstruct`
-        # XXX ALSO DOESN'T WORK
-        defstruct_msgtype = defstruct(
-            name=msgtype.__name__,
-            fields=[
-                ('cid', str),
-
-                # XXX doesn't seem to work..
-                # ('pld', PayloadT),
-
-                ('pld', payload_type_union),
-            ],
-            bases=defstruct_bases,
-        )
-        defs_msg_types.append(defstruct_msgtype)
-
-        # assert index_paramed_msg_type == manual_paramed_msg_subtype
-
-        # paramed_msg_type = manual_paramed_msg_subtype
-
-        # ipc_payload_msgs_type_union |= index_paramed_msg_type
-
-    idx_spec: Union[Type[Msg]] = Union[*idx_msg_types]
-    def_spec: Union[Type[Msg]] = Union[*defs_msg_types]
-    nc_spec: Union[Type[Msg]] = Union[*nc_msg_types]
-
-    specs: dict[str, Union[Type[Msg]]] = {
-        'indexed_generics': idx_spec,
-        'defstruct': def_spec,
-        'types_new_class': nc_spec,
-    }
-    msgtypes_table: dict[str, list[Msg]] = {
-        'indexed_generics': idx_msg_types,
-        'defstruct': defs_msg_types,
-        'types_new_class': nc_msg_types,
-    }
-
-    # XXX lol apparently type unions can't ever
-    # be equal eh?
-    # TODO: grok the diff here better..
-    #
-    # assert (
-    #     idx_spec
-    #     ==
-    #     nc_spec
-    #     ==
-    #     def_spec
-    # )
-    # breakpoint()
-
-    pld_spec: Union[Type] = specs[spec_build_method]
-    runtime_spec: Union[Type] = Union[*ipc_msg_types]
-    ipc_spec = pld_spec | runtime_spec
-    log.runtime(
-        'Generating new IPC msg-spec\n'
-        f'{ipc_spec}\n'
-    )
-    assert (
-        ipc_spec
-        and
-        ipc_spec is not Any
-    )
-    return (
-        ipc_spec,
-        msgtypes_table[spec_build_method]
-        +
-        ipc_msg_types,
-    )

tractor/to_asyncio.py

@@ -18,44 +18,34 @@
 Infection apis for ``asyncio`` loops running ``trio`` using guest mode.
 
 '''
-from __future__ import annotations
 import asyncio
 from asyncio.exceptions import CancelledError
 from contextlib import asynccontextmanager as acm
 from dataclasses import dataclass
 import inspect
-import traceback
 from typing import (
     Any,
     Callable,
     AsyncIterator,
     Awaitable,
+    Optional,
 )
 
-import tractor
-from tractor._exceptions import AsyncioCancelled
-from tractor._state import (
-    debug_mode,
-)
-from tractor.devx import _debug
-from tractor.log import get_logger
-from tractor.trionics._broadcast import (
+import trio
+from outcome import Error
+
+from .log import get_logger
+from ._state import current_actor
+from ._exceptions import AsyncioCancelled
+from .trionics._broadcast import (
     broadcast_receiver,
     BroadcastReceiver,
 )
-import trio
-from outcome import (
-    Error,
-    Outcome,
-)
 
 log = get_logger(__name__)
 
 
-__all__ = [
-    'run_task',
-    'run_as_asyncio_guest',
-]
+__all__ = ['run_task', 'run_as_asyncio_guest']
 
 
 @dataclass
@@ -75,9 +65,9 @@ class LinkedTaskChannel(trio.abc.Channel):
     _trio_exited: bool = False
 
     # set after ``asyncio.create_task()``
-    _aio_task: asyncio.Task|None = None
-    _aio_err: BaseException|None = None
-    _broadcaster: BroadcastReceiver|None = None
+    _aio_task: Optional[asyncio.Task] = None
+    _aio_err: Optional[BaseException] = None
+    _broadcaster: Optional[BroadcastReceiver] = None
 
     async def aclose(self) -> None:
         await self._from_aio.aclose()
@@ -159,20 +149,17 @@ def _run_asyncio_task(
     *,
     qsize: int = 1,
     provide_channels: bool = False,
-    hide_tb: bool = False,
     **kwargs,
 
 ) -> LinkedTaskChannel:
     '''
     Run an ``asyncio`` async function or generator in a task, return
-    or stream the result back to the caller `trio.lowleve.Task`.
+    or stream the result back to ``trio``.
 
     '''
-    __tracebackhide__: bool = hide_tb
-    if not tractor.current_actor().is_infected_aio():
-        raise RuntimeError(
-            "`infect_asyncio` mode is not enabled!?"
-        )
+    __tracebackhide__ = True
+    if not current_actor().is_infected_aio():
+        raise RuntimeError("`infect_asyncio` mode is not enabled!?")
 
     # ITC (inter task comms), these channel/queue names are mostly from
     # ``asyncio``'s perspective.
@@ -180,6 +167,7 @@ def _run_asyncio_task(
     to_trio, from_aio = trio.open_memory_channel(qsize)  # type: ignore
 
     args = tuple(inspect.getfullargspec(func).args)
+
     if getattr(func, '_tractor_steam_function', None):
         # the assumption is that the target async routine accepts the
         # send channel then it intends to yield more then one return
@@ -200,7 +188,7 @@ def _run_asyncio_task(
 
     cancel_scope = trio.CancelScope()
     aio_task_complete = trio.Event()
-    aio_err: BaseException|None = None
+    aio_err: Optional[BaseException] = None
 
     chan = LinkedTaskChannel(
         aio_q,  # asyncio.Queue
@@ -229,15 +217,8 @@ def _run_asyncio_task(
         try:
             result = await coro
         except BaseException as aio_err:
+            log.exception('asyncio task errored')
             chan._aio_err = aio_err
-            if isinstance(aio_err, CancelledError):
-                log.runtime(
-                    '`asyncio` task was cancelled..\n'
-                )
-            else:
-                log.exception(
-                    '`asyncio` task errored\n'
-                )
             raise
 
         else:
@@ -266,69 +247,37 @@ def _run_asyncio_task(
     if not inspect.isawaitable(coro):
         raise TypeError(f"No support for invoking {coro}")
 
-    task: asyncio.Task = asyncio.create_task(
+    task = asyncio.create_task(
         wait_on_coro_final_result(
             to_trio,
             coro,
             aio_task_complete
         )
     )
-    chan._aio_task: asyncio.Task = task
-
-    # XXX TODO XXX get this actually workin.. XD
-    # -[ ] we need logic to setup `greenback` for `asyncio`-side task
-    #     REPLing.. which should normally be nearly the same as for
-    #     `trio`?
-    # -[ ] add to a new `.devx._greenback.maybe_init_for_asyncio()`?
-    if (
-        debug_mode()
-        and
-        (greenback := _debug.maybe_import_greenback(
-            force_reload=True,
-            raise_not_found=False,
-        ))
-    ):
-        greenback.bestow_portal(task)
+    chan._aio_task = task
 
     def cancel_trio(task: asyncio.Task) -> None:
         '''
-        Cancel the calling `trio` task on error.
+        Cancel the calling ``trio`` task on error.
 
         '''
         nonlocal chan
-        aio_err: BaseException|None = chan._aio_err
-        task_err: BaseException|None = None
+        aio_err = chan._aio_err
+        task_err: Optional[BaseException] = None
 
-        # only to avoid `asyncio` complaining about uncaptured
+        # only to avoid ``asyncio`` complaining about uncaptured
         # task exceptions
         try:
-            res: Any = task.result()
+            task.exception()
         except BaseException as terr:
-            task_err: BaseException = terr
+            task_err = terr
 
-            msg: str = (
-                'Infected `asyncio` task {etype_str}\n'
-            )
             if isinstance(terr, CancelledError):
-                msg += (
-                    f'c)>\n'
-                    f' |_{task}\n'
-                )
-                log.cancel(
-                    msg.format(etype_str='cancelled')
-                )
+                log.cancel(f'`asyncio` task cancelled: {task.get_name()}')
             else:
-                msg += (
-                    f'x)>\n'
-                    f' |_{task}\n'
-                )
-                log.exception(
-                    msg.format(etype_str='errored')
-                )
+                log.exception(f'`asyncio` task: {task.get_name()} errored')
 
-            assert type(terr) is type(aio_err), (
-                '`asyncio` task error mismatch?!?'
-            )
+            assert type(terr) is type(aio_err), 'Asyncio task error mismatch?'
 
         if aio_err is not None:
             # XXX: uhh is this true?
@@ -341,47 +290,27 @@ def _run_asyncio_task(
             # We might want to change this in the future though.
             from_aio.close()
 
-            if task_err is None:
+            if type(aio_err) is CancelledError:
+                log.cancel("infected task was cancelled")
+
+                # TODO: show that the cancellation originated
+                # from the ``trio`` side? right?
+                # if cancel_scope.cancelled:
+                #     raise aio_err from err
+
+            elif task_err is None:
                 assert aio_err
-                # wait, wut?
-                # aio_err.with_traceback(aio_err.__traceback__)
+                aio_err.with_traceback(aio_err.__traceback__)
+                log.error('infected task errorred')
 
-            # TODO: show when cancellation originated
-            # from each side more pedantically?
-            # elif (
-            #     type(aio_err) is CancelledError
-            #     and  # trio was the cause?
-            #     cancel_scope.cancel_called
-            # ):
-            #     log.cancel(
-            #         'infected task was cancelled by `trio`-side'
-            #     )
-            #     raise aio_err from task_err
-
-            # XXX: if not already, alway cancel the scope
-            # on a task error in case the trio task is blocking on
-            # a checkpoint.
+            # XXX: alway cancel the scope on error
+            # in case the trio task is blocking
+            # on a checkpoint.
             cancel_scope.cancel()
 
-            if (
-                task_err
-                and
-                aio_err is not task_err
-            ):
-                raise aio_err from task_err
-
-            # raise any `asyncio` side error.
+            # raise any ``asyncio`` side error.
             raise aio_err
 
-        log.info(
-            '`trio` received final result from {task}\n'
-            f'|_{res}\n'
-        )
-        # TODO: do we need this?
-        # if task_err:
-        #     cancel_scope.cancel()
-        #     raise task_err
-
     task.add_done_callback(cancel_trio)
     return chan
 
@@ -400,17 +329,15 @@ async def translate_aio_errors(
     '''
     trio_task = trio.lowlevel.current_task()
 
-    aio_err: BaseException|None = None
+    aio_err: Optional[BaseException] = None
 
     # TODO: make thisi a channel method?
     def maybe_raise_aio_err(
-        err: Exception|None = None
+        err: Optional[Exception] = None
     ) -> None:
         aio_err = chan._aio_err
         if (
-            aio_err is not None
-            and
-            # not isinstance(aio_err, CancelledError)
+            aio_err is not None and
             type(aio_err) != CancelledError
         ):
             # always raise from any captured asyncio error
@@ -442,17 +369,13 @@ async def translate_aio_errors(
     ):
         aio_err = chan._aio_err
         if (
-            task.cancelled()
-            and
+            task.cancelled() and
             type(aio_err) is CancelledError
         ):
-            # if an underlying `asyncio.CancelledError` triggered this
+            # if an underlying ``asyncio.CancelledError`` triggered this
             # channel close, raise our (non-``BaseException``) wrapper
             # error: ``AsyncioCancelled`` from that source error.
-            raise AsyncioCancelled(
-                f'Task cancelled\n'
-                f'|_{task}\n'
-            ) from aio_err
+            raise AsyncioCancelled from aio_err
 
         else:
             raise
@@ -495,8 +418,8 @@ async def run_task(
 
 ) -> Any:
     '''
-    Run an `asyncio` async function or generator in a task, return
-    or stream the result back to `trio`.
+    Run an ``asyncio`` async function or generator in a task, return
+    or stream the result back to ``trio``.
 
     '''
     # simple async func
@@ -554,124 +477,11 @@ async def open_channel_from(
                 chan._to_trio.close()
 
 
-class AsyncioRuntimeTranslationError(RuntimeError):
-    '''
-    We failed to correctly relay runtime semantics and/or maintain SC
-    supervision rules cross-event-loop.
-
-    '''
-
-
-def run_trio_task_in_future(
-    async_fn,
-    *args,
-) -> asyncio.Future:
-    '''
-    Run an async-func as a `trio` task from an `asyncio.Task` wrapped
-    in a `asyncio.Future` which is returned to the caller.
-
-    Another astounding feat by the great @oremanj !!
-
-    Bo
-
-    '''
-    result_future = asyncio.Future()
-    cancel_scope = trio.CancelScope()
-    finished: bool = False
-
-    # monkey-patch the future's `.cancel()` meth to
-    # allow cancellation relay to `trio`-task.
-    cancel_message: str|None = None
-    orig_cancel = result_future.cancel
-
-    def wrapped_cancel(
-        msg: str|None = None,
-    ):
-        nonlocal cancel_message
-        if finished:
-            # We're being called back after the task completed
-            if msg is not None:
-                return orig_cancel(msg)
-            elif cancel_message is not None:
-                return orig_cancel(cancel_message)
-            else:
-                return orig_cancel()
-
-        if result_future.done():
-            return False
-
-        # Forward cancellation to the Trio task, don't mark
-        # future as cancelled until it completes
-        cancel_message = msg
-        cancel_scope.cancel()
-        return True
-
-    result_future.cancel = wrapped_cancel
-
-    async def trio_task() -> None:
-        nonlocal finished
-        try:
-            with cancel_scope:
-                try:
-                    # TODO: type this with new tech in 3.13
-                    result: Any = await async_fn(*args)
-                finally:
-                    finished = True
-
-            # Propagate result or cancellation to the Future
-            if cancel_scope.cancelled_caught:
-                result_future.cancel()
-
-            elif not result_future.cancelled():
-                result_future.set_result(result)
-
-        except BaseException as exc:
-            # the result future gets all the non-Cancelled
-            # exceptions. Any Cancelled need to keep propagating
-            # out of this stack frame in order to reach the cancel
-            # scope for which they're intended.
-            cancelled: BaseException|None
-            rest: BaseException|None
-            if isinstance(exc, BaseExceptionGroup):
-                cancelled, rest = exc.split(trio.Cancelled)
-
-            elif isinstance(exc, trio.Cancelled):
-                cancelled, rest = exc, None
-
-            else:
-                cancelled, rest = None, exc
-
-            if not result_future.cancelled():
-                if rest:
-                    result_future.set_exception(rest)
-                else:
-                    result_future.cancel()
-
-            if cancelled:
-                raise cancelled
-
-    trio.lowlevel.spawn_system_task(
-        trio_task,
-        name=async_fn,
-    )
-    return result_future
-
-
 def run_as_asyncio_guest(
-    trio_main: Callable,
-    # ^-NOTE-^ when spawned with `infected_aio=True` this func is
-    # normally `Actor._async_main()` as is passed by some boostrap
-    # entrypoint like `._entry._trio_main()`.
 
-    _sigint_loop_pump_delay: float = 0,
+    trio_main: Callable,
 
 ) -> None:
-# ^-TODO-^ technically whatever `trio_main` returns.. we should
-# try to use func-typevar-params at leaast by 3.13!
-# -[ ] https://typing.readthedocs.io/en/latest/spec/callables.html#callback-protocols
-# -[ ] https://peps.python.org/pep-0646/#using-type-variable-tuples-in-functions
-# -[ ] https://typing.readthedocs.io/en/latest/spec/callables.html#unpack-for-keyword-arguments
-# -[ ] https://peps.python.org/pep-0718/
     '''
     Entry for an "infected ``asyncio`` actor".
 
@@ -697,213 +507,37 @@ def run_as_asyncio_guest(
     # :)
 
     async def aio_main(trio_main):
-        '''
-        Main `asyncio.Task` which calls
-        `trio.lowlevel.start_guest_run()` to "infect" the `asyncio`
-        event-loop by embedding the `trio` scheduler allowing us to
-        boot the `tractor` runtime and connect back to our parent.
 
-        '''
         loop = asyncio.get_running_loop()
-        trio_done_fute = asyncio.Future()
-        startup_msg: str = (
-            'Starting `asyncio` guest-loop-run\n'
-            '-> got running loop\n'
-            '-> built a `trio`-done future\n'
-        )
-
-        # TODO: shoudn't this be done in the guest-run trio task?
-        # if debug_mode():
-        #     # XXX make it obvi we know this isn't supported yet!
-        #     log.error(
-        #         'Attempting to enter unsupported `greenback` init '
-        #         'from `asyncio` task..'
-        #     )
-        #     await _debug.maybe_init_greenback(
-        #         force_reload=True,
-        #     )
+        trio_done_fut = asyncio.Future()
 
         def trio_done_callback(main_outcome):
-            log.runtime(
-                f'`trio` guest-run finishing with outcome\n'
-                f'>) {main_outcome}\n'
-                f'|_{trio_done_fute}\n'
-            )
 
             if isinstance(main_outcome, Error):
-                error: BaseException = main_outcome.error
+                error = main_outcome.error
+                trio_done_fut.set_exception(error)
 
-                # show an dedicated `asyncio`-side tb from the error
-                tb_str: str = ''.join(traceback.format_exception(error))
-                log.exception(
-                    'Guest-run errored!?\n\n'
-                    f'{main_outcome}\n'
-                    f'{error}\n\n'
-                    f'{tb_str}\n'
-                )
-                trio_done_fute.set_exception(error)
+                # TODO: explicit asyncio tb?
+                # traceback.print_exception(error)
+
+                # XXX: do we need this?
+                # actor.cancel_soon()
 
-                # raise inline
                 main_outcome.unwrap()
-
             else:
-                trio_done_fute.set_result(main_outcome)
-
-            log.info(
-                f'`trio` guest-run finished with outcome\n'
-                f')>\n'
-                f'|_{trio_done_fute}\n'
-            )
-
-        startup_msg += (
-            f'-> created {trio_done_callback!r}\n'
-            f'-> scheduling `trio_main`: {trio_main!r}\n'
-        )
+                trio_done_fut.set_result(main_outcome)
+                log.runtime(f"trio_main finished: {main_outcome!r}")
 
         # start the infection: run trio on the asyncio loop in "guest mode"
-        log.runtime(
-            f'{startup_msg}\n\n'
-            +
-            'Infecting `asyncio`-process with a `trio` guest-run!\n'
-        )
+        log.info(f"Infecting asyncio process with {trio_main}")
 
         trio.lowlevel.start_guest_run(
             trio_main,
             run_sync_soon_threadsafe=loop.call_soon_threadsafe,
             done_callback=trio_done_callback,
         )
-        fute_err: BaseException|None = None
-        try:
-            out: Outcome = await asyncio.shield(trio_done_fute)
-
-            # NOTE will raise (via `Error.unwrap()`) from any
-            # exception packed into the guest-run's `main_outcome`.
-            return out.unwrap()
-
-        except (
-            # XXX special SIGINT-handling is required since
-            # `asyncio.shield()`-ing seems to NOT handle that case as
-            # per recent changes in 3.11:
-            # https://docs.python.org/3/library/asyncio-runner.html#handling-keyboard-interruption
-            #
-            # NOTE: further, apparently ONLY need to handle this
-            # special SIGINT case since all other `asyncio`-side
-            # errors can be processed via our `chan._aio_err`
-            # relaying (right?); SIGINT seems to be totally diff
-            # error path in `asyncio`'s runtime..?
-            asyncio.CancelledError,
-
-        ) as _fute_err:
-            fute_err = _fute_err
-            err_message: str = (
-                'main `asyncio` task '
-            )
-            if isinstance(fute_err, asyncio.CancelledError):
-                err_message += 'was cancelled!\n'
-            else:
-                err_message += f'errored with {out.error!r}\n'
-
-            actor: tractor.Actor = tractor.current_actor()
-            log.exception(
-                err_message
-                +
-                'Cancelling `trio`-side `tractor`-runtime..\n'
-                f'c)>\n'
-                f'  |_{actor}.cancel_soon()\n'
-            )
-
-            # XXX WARNING XXX the next LOCs are super important, since
-            # without them, we can get guest-run abandonment cases
-            # where `asyncio` will not schedule or wait on the `trio`
-            # guest-run task before final shutdown! This is
-            # particularly true if the `trio` side has tasks doing
-            # shielded work when a SIGINT condition occurs.
-            #
-            # We now have the
-            # `test_infected_asyncio.test_sigint_closes_lifetime_stack()`
-            # suite to ensure we do not suffer this issues
-            # (hopefully) ever again.
-            #
-            # The original abandonment issue surfaced as 2 different
-            # race-condition dependent types scenarios all to do with
-            # `asyncio` handling SIGINT from the system:
-            #
-            # - "silent-abandon" (WORST CASE):
-            #  `asyncio` abandons the `trio` guest-run task silently
-            #  and no `trio`-guest-run or `tractor`-actor-runtime
-            #  teardown happens whatsoever..
-            #
-            # - "loud-abandon" (BEST-ish CASE):
-            #   the guest run get's abaondoned "loudly" with `trio`
-            #   reporting a console traceback and further tbs of all
-            #   the (failed) GC-triggered shutdown routines which
-            #   thankfully does get dumped to console..
-            #
-            # The abandonment is most easily reproduced if the `trio`
-            # side has tasks doing shielded work where those tasks
-            # ignore the normal `Cancelled` condition and continue to
-            # run, but obviously `asyncio` isn't aware of this and at
-            # some point bails on the guest-run unless we take manual
-            # intervention..
-            #
-            # To repeat, *WITHOUT THIS* stuff below the guest-run can
-            # get race-conditionally abandoned!!
-            #
-            # XXX SOLUTION XXX
-            # ------ - ------
-            # XXX FIRST PART:
-            # ------ - ------
-            # the obvious fix to the "silent-abandon" case is to
-            # explicitly cancel the actor runtime such that no
-            # runtime tasks are even left unaware that the guest-run
-            # should be terminated due to OS cancellation.
-            #
-            actor.cancel_soon()
-
-            # ------ - ------
-            # XXX SECOND PART:
-            # ------ - ------
-            # Pump the `asyncio` event-loop to allow
-            # `trio`-side to `trio`-guest-run to complete and
-            # teardown !!
-            #
-            # oh `asyncio`, how i don't miss you at all XD
-            while not trio_done_fute.done():
-                log.runtime(
-                    'Waiting on main guest-run `asyncio` task to complete..\n'
-                    f'|_trio_done_fut: {trio_done_fute}\n'
-                )
-                await asyncio.sleep(_sigint_loop_pump_delay)
-
-                # XXX is there any alt API/approach like the internal
-                # call below but that doesn't block indefinitely..?
-                # loop._run_once()
-
-            try:
-                return trio_done_fute.result()
-            except asyncio.exceptions.InvalidStateError as state_err:
-
-                # XXX be super dupere noisy about abandonment issues!
-                aio_task: asyncio.Task = asyncio.current_task()
-                message: str = (
-                    'The `asyncio`-side task likely exited before the '
-                    '`trio`-side guest-run completed!\n\n'
-                )
-                if fute_err:
-                    message += (
-                        f'The main {aio_task}\n'
-                        f'STOPPED due to {type(fute_err)}\n\n'
-                    )
-
-                message += (
-                    f'Likely something inside our guest-run-as-task impl is '
-                    f'not effectively waiting on the `trio`-side to complete ?!\n'
-                    f'This code -> {aio_main!r}\n\n'
-
-                    'Below you will likely see a '
-                    '"RuntimeWarning: Trio guest run got abandoned.." !!\n'
-                )
-                raise AsyncioRuntimeTranslationError(message) from state_err
+        # ``.unwrap()`` will raise here on error
+        return (await trio_done_fut).unwrap()
 
     # might as well if it's installed.
     try:
@@ -911,8 +545,6 @@ def run_as_asyncio_guest(
         loop = uvloop.new_event_loop()
         asyncio.set_event_loop(loop)
     except ImportError:
-        log.runtime('`uvloop` not available..')
+        pass
 
-    return asyncio.run(
-        aio_main(trio_main),
-    )
+    return asyncio.run(aio_main(trio_main))

tractor/trionics/__init__.py

@@ -19,13 +19,22 @@ Sugary patterns for trio + tractor designs.
 
 '''
 from ._mngrs import (
-    gather_contexts as gather_contexts,
-    maybe_open_context as maybe_open_context,
-    maybe_open_nursery as maybe_open_nursery,
+    gather_contexts,
+    maybe_open_context,
+    maybe_open_nursery,
 )
 from ._broadcast import (
-    AsyncReceiver as AsyncReceiver,
-    broadcast_receiver as broadcast_receiver,
-    BroadcastReceiver as BroadcastReceiver,
-    Lagged as Lagged,
+    broadcast_receiver,
+    BroadcastReceiver,
+    Lagged,
 )
+
+
+__all__ = [
+    'gather_contexts',
+    'broadcast_receiver',
+    'BroadcastReceiver',
+    'Lagged',
+    'maybe_open_context',
+    'maybe_open_nursery',
+]

tractor/trionics/_broadcast.py

@@ -25,15 +25,8 @@ from collections import deque
 from contextlib import asynccontextmanager
 from functools import partial
 from operator import ne
-from typing import (
-    Callable,
-    Awaitable,
-    Any,
-    AsyncIterator,
-    Protocol,
-    Generic,
-    TypeVar,
-)
+from typing import Optional, Callable, Awaitable, Any, AsyncIterator, Protocol
+from typing import Generic, TypeVar
 
 import trio
 from trio._core._run import Task
@@ -44,11 +37,6 @@ from tractor.log import get_logger
 
 log = get_logger(__name__)
 
-# TODO: use new type-vars syntax from 3.12
-# https://realpython.com/python312-new-features/#dedicated-type-variable-syntax
-# https://docs.python.org/3/whatsnew/3.12.html#whatsnew312-pep695
-# https://docs.python.org/3/reference/simple_stmts.html#type
-#
 # A regular invariant generic type
 T = TypeVar("T")
 
@@ -114,7 +102,7 @@ class BroadcastState(Struct):
 
     # broadcast event to wake up all sleeping consumer tasks
     # on a newly produced value from the sender.
-    recv_ready: tuple[int, trio.Event]|None = None
+    recv_ready: Optional[tuple[int, trio.Event]] = None
 
     # if a ``trio.EndOfChannel`` is received on any
     # consumer all consumers should be placed in this state
@@ -156,12 +144,11 @@ class BroadcastState(Struct):
 
 class BroadcastReceiver(ReceiveChannel):
     '''
-    A memory receive channel broadcaster which is non-lossy for
-    the fastest consumer.
+    A memory receive channel broadcaster which is non-lossy for the
+    fastest consumer.
 
-    Additional consumer tasks can receive all produced values by
-    registering with ``.subscribe()`` and receiving from the new
-    instance it delivers.
+    Additional consumer tasks can receive all produced values by registering
+    with ``.subscribe()`` and receiving from the new instance it delivers.
 
     '''
     def __init__(
@@ -169,7 +156,7 @@ class BroadcastReceiver(ReceiveChannel):
 
         rx_chan: AsyncReceiver,
         state: BroadcastState,
-        receive_afunc: Callable[[], Awaitable[Any]]|None = None,
+        receive_afunc: Optional[Callable[[], Awaitable[Any]]] = None,
         raise_on_lag: bool = True,
 
     ) -> None:
@@ -457,7 +444,7 @@ def broadcast_receiver(
 
     recv_chan: AsyncReceiver,
     max_buffer_size: int,
-    receive_afunc: Callable[[], Awaitable[Any]]|None = None,
+    receive_afunc: Optional[Callable[[], Awaitable[Any]]] = None,
     raise_on_lag: bool = True,
 
 ) -> BroadcastReceiver:

tractor/trionics/_mngrs.py

@@ -18,12 +18,8 @@
 Async context manager primitives with hard ``trio``-aware semantics
 
 '''
-from __future__ import annotations
-from contextlib import (
-    asynccontextmanager as acm,
-)
+from contextlib import asynccontextmanager as acm
 import inspect
-from types import ModuleType
 from typing import (
     Any,
     AsyncContextManager,
@@ -34,15 +30,13 @@ from typing import (
     Optional,
     Sequence,
     TypeVar,
-    TYPE_CHECKING,
 )
 
 import trio
-from tractor._state import current_actor
-from tractor.log import get_logger
+from trio_typing import TaskStatus
 
-if TYPE_CHECKING:
-    from tractor import ActorNursery
+from .._state import current_actor
+from ..log import get_logger
 
 
 log = get_logger(__name__)
@@ -53,10 +47,8 @@ T = TypeVar("T")
 
 @acm
 async def maybe_open_nursery(
-    nursery: trio.Nursery|ActorNursery|None = None,
+    nursery: trio.Nursery | None = None,
     shield: bool = False,
-    lib: ModuleType = trio,
-
 ) -> AsyncGenerator[trio.Nursery, Any]:
     '''
     Create a new nursery if None provided.
@@ -67,17 +59,17 @@ async def maybe_open_nursery(
     if nursery is not None:
         yield nursery
     else:
-        async with lib.open_nursery() as nursery:
+        async with trio.open_nursery() as nursery:
             nursery.cancel_scope.shield = shield
             yield nursery
 
 
 async def _enter_and_wait(
+
     mngr: AsyncContextManager[T],
     unwrapped: dict[int, T],
     all_entered: trio.Event,
     parent_exit: trio.Event,
-    seed: int,
 
 ) -> None:
     '''
@@ -88,10 +80,7 @@ async def _enter_and_wait(
     async with mngr as value:
         unwrapped[id(mngr)] = value
 
-        if all(
-            val != seed
-            for val in unwrapped.values()
-        ):
+        if all(unwrapped.values()):
             all_entered.set()
 
         await parent_exit.wait()
@@ -99,34 +88,23 @@ async def _enter_and_wait(
 
 @acm
 async def gather_contexts(
+
     mngrs: Sequence[AsyncContextManager[T]],
 
-) -> AsyncGenerator[
-    tuple[
-        T | None,
-        ...
-    ],
-    None,
-]:
+) -> AsyncGenerator[tuple[Optional[T], ...], None]:
     '''
-    Concurrently enter a sequence of async context managers (acms),
-    each from a separate `trio` task and deliver the unwrapped
-    `yield`-ed values in the same order once all managers have entered.
+    Concurrently enter a sequence of async context managers, each in
+    a separate ``trio`` task and deliver the unwrapped values in the
+    same order once all managers have entered. On exit all contexts are
+    subsequently and concurrently exited.
 
-    On exit, all acms are subsequently and concurrently exited.
-
-    This function is somewhat similar to a batch of non-blocking
-    calls to `contextlib.AsyncExitStack.enter_async_context()`
-    (inside a loop) *in combo with* a `asyncio.gather()` to get the
-    `.__aenter__()`-ed values, except the managers are both
-    concurrently entered and exited and *cancellation just works*(R).
+    This function is somewhat similar to common usage of
+    ``contextlib.AsyncExitStack.enter_async_context()`` (in a loop) in
+    combo with ``asyncio.gather()`` except the managers are concurrently
+    entered and exited, and cancellation just works.
 
     '''
-    seed: int = id(mngrs)
-    unwrapped: dict[int, T | None] = {}.fromkeys(
-        (id(mngr) for mngr in mngrs),
-        seed,
-    )
+    unwrapped: dict[int, Optional[T]] = {}.fromkeys(id(mngr) for mngr in mngrs)
 
     all_entered = trio.Event()
     parent_exit = trio.Event()
@@ -138,9 +116,8 @@ async def gather_contexts(
 
     if not mngrs:
         raise ValueError(
-            '`.trionics.gather_contexts()` input mngrs is empty?\n'
-            'Did try to use inline generator syntax?\n'
-            'Use a non-lazy iterator or sequence type intead!'
+            'input mngrs is empty?\n'
+            'Did try to use inline generator syntax?'
         )
 
     async with trio.open_nursery() as n:
@@ -151,7 +128,6 @@ async def gather_contexts(
                 unwrapped,
                 all_entered,
                 parent_exit,
-                seed,
             )
 
         # deliver control once all managers have started up
@@ -192,7 +168,7 @@ class _Cache:
         cls,
         mng,
         ctx_key: tuple,
-        task_status: trio.TaskStatus[T] = trio.TASK_STATUS_IGNORED,
+        task_status: TaskStatus[T] = trio.TASK_STATUS_IGNORED,
 
     ) -> None:
         async with mng as value:
@@ -219,10 +195,9 @@ async def maybe_open_context(
 
 ) -> AsyncIterator[tuple[bool, T]]:
     '''
-    Maybe open an async-context-manager (acm) if there is not already
-    a `_Cached` version for the provided (input) `key` for *this* actor.
-
-    Return the `_Cached` instance on a _Cache hit.
+    Maybe open a context manager if there is not already a _Cached
+    version for the provided ``key`` for *this* actor. Return the
+    _Cached instance on a _Cache hit.
 
     '''
     fid = id(acm_func)
@@ -234,7 +209,6 @@ async def maybe_open_context(
 
     # yielded output
     yielded: Any = None
-    lock_registered: bool = False
 
     # Lock resource acquisition around task racing  / ``trio``'s
     # scheduler protocol.
@@ -242,7 +216,6 @@ async def maybe_open_context(
     # to allow re-entrant use cases where one `maybe_open_context()`
     # wrapped factor may want to call into another.
     lock = _Cache.locks.setdefault(fid, trio.Lock())
-    lock_registered: bool = True
     await lock.acquire()
 
     # XXX: one singleton nursery per actor and we want to
@@ -264,7 +237,7 @@ async def maybe_open_context(
         yielded = _Cache.values[ctx_key]
 
     except KeyError:
-        log.debug(f'Allocating new {acm_func} for {ctx_key}')
+        log.info(f'Allocating new {acm_func} for {ctx_key}')
         mngr = acm_func(**kwargs)
         resources = _Cache.resources
         assert not resources.get(ctx_key), f'Resource exists? {ctx_key}'
@@ -281,16 +254,8 @@ async def maybe_open_context(
         yield False, yielded
 
     else:
+        log.info(f'Reusing _Cached resource for {ctx_key}')
         _Cache.users += 1
-        log.runtime(
-            f'Re-using cached resource for user {_Cache.users}\n\n'
-            f'{ctx_key!r} -> {type(yielded)}\n'
-
-            # TODO: make this work with values but without
-            # `msgspec.Struct` causing frickin crashes on field-type
-            # lookups..
-            # f'{ctx_key!r} -> {yielded!r}\n'
-        )
         lock.release()
         yield True, yielded
 
@@ -300,7 +265,7 @@ async def maybe_open_context(
         if yielded is not None:
             # if no more consumers, teardown the client
             if _Cache.users <= 0:
-                log.debug(f'De-allocating resource for {ctx_key}')
+                log.info(f'De-allocating resource for {ctx_key}')
 
                 # XXX: if we're cancelled we the entry may have never
                 # been entered since the nursery task was killed.
@@ -310,9 +275,4 @@ async def maybe_open_context(
                     _, no_more_users = entry
                     no_more_users.set()
 
-                if lock_registered:
-                    maybe_lock = _Cache.locks.pop(fid, None)
-                    if maybe_lock is None:
-                        log.error(
-                            f'Resource lock for {fid} ALREADY POPPED?'
-                        )
+                _Cache.locks.pop(fid)