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

@@ -6,115 +6,47 @@ 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(
+async def break_channel_silently_then_error(
     stream: MsgStream,
-    method: str|None = None,
-    pre_close: bool = False,
+):
+    async for msg in stream:
+        await stream.send(msg)
 
-    def_method: str = 'eof',
+        # 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
 
-) -> 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:
+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()
-
-    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 'trans_aclose':
-            await stream._ctx.chan.transport.stream.aclose()
-
-        case 'eof':
-            await stream._ctx.chan.transport.stream.send_eof()
-
-        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}'
-            )
-
-
-async def break_ipc_then_error(
-    stream: MsgStream,
-    break_ipc_with: str|None = None,
-    pre_close: bool = False,
-):
-    await 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)
+        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:
     '''
@@ -129,53 +61,26 @@ async def recv_and_spawn_net_killers(
         async for i in stream:
             print(f'child echoing {i}')
             await stream.send(i)
-
             if (
                 break_ipc_after
-                and
-                i >= break_ipc_after
+                and i > break_ipc_after
             ):
-                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:
 
@@ -186,123 +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?
                     print(f'parent sending {i}')
-                    try:
-                        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
+                    await stream.send(i)
 
-                        # TODO: is this needed or no?
-                        raise
+                    with trio.move_on_after(2) as cs:
 
-                    # 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

@@ -1,119 +0,0 @@
-import asyncio
-
-import trio
-import tractor
-from tractor import to_asyncio
-
-
-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 = False,
-):
-
-    # 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 = False,
-
-) -> None:
-
-    async with tractor.open_nursery(
-        # debug_mode=True,
-    ) as n:
-
-        p = await n.start_actor(
-            'aio_daemon',
-            enable_modules=[__name__],
-            infect_asyncio=True,
-            debug_mode=True,
-            loglevel='cancel',
-        )
-
-        async with p.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 p.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

@@ -32,7 +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/sync_bp.py

@@ -1,73 +0,0 @@
-import trio
-import tractor
-
-
-def sync_pause(
-    use_builtin: bool = True,
-    error: bool = False,
-):
-    if use_builtin:
-        breakpoint()
-
-    else:
-        tractor.pause_from_sync()
-
-    if error:
-        raise RuntimeError('yoyo sync code error')
-
-
-@tractor.context
-async def start_n_sync_pause(
-    ctx: tractor.Context,
-):
-    # sync to requesting peer
-    await ctx.started()
-
-    actor: tractor.Actor = tractor.current_actor()
-    print(f'entering SYNC PAUSE in {actor.uid}')
-    sync_pause()
-    print(f'back from SYNC PAUSE in {actor.uid}')
-
-
-async def main() -> None:
-
-    async with tractor.open_nursery(
-        debug_mode=True,
-    ) as an:
-
-        p: tractor.Portal  = await an.start_actor(
-            'subactor',
-            enable_modules=[__name__],
-            # infect_asyncio=True,
-            debug_mode=True,
-            loglevel='cancel',
-        )
-
-        # TODO: 3 sub-actor usage cases:
-        # -[ ] via a `.run_in_actor()` call
-        # -[ ] via a `.run()`
-        # -[ ] via a `.open_context()`
-        #
-        async with p.open_context(
-            start_n_sync_pause,
-        ) as (ctx, first):
-            assert first is None
-
-            await tractor.pause()
-            sync_pause()
-
-        # TODO: make this work!!
-        await trio.to_thread.run_sync(
-            sync_pause,
-            abandon_on_cancel=False,
-        )
-
-        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

@@ -65,28 +65,21 @@ async def aggregate(seed):
     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)
-    nursery: tractor.ActorNursery
-    async with tractor.open_nursery() as nursery:
+# this is the main actor and *arbiter*
+async def main():
+    # a nursery which spawns "actors"
+    async with tractor.open_nursery(
+        arbiter_addr=('127.0.0.1', 1616)
+    ) as nursery:
 
         seed = int(1e3)
         pre_start = time.time()
 
-        portal: tractor.Portal = await nursery.start_actor(
+        portal = await nursery.start_actor(
             name='aggregator',
             enable_modules=[__name__],
         )
 
-        stream: tractor.MsgStream
         async with portal.open_stream_from(
             aggregate,
             seed=seed,

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:

pyproject.toml

@@ -26,23 +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"

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/test_advanced_faults.py

@@ -3,29 +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,
 )
 
 
 @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',
@@ -70,10 +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
@@ -92,130 +83,70 @@ def test_ipc_channel_break_during_stream(
         # requires the user to do ctl-c to cancel the actor tree.
         expect_final_exc = trio.ClosedResourceError
 
-    mod: ModuleType = import_path(
+    mod = import_path(
         examples_dir() / 'advanced_faults' / 'ipc_failure_during_stream.py',
         root=examples_dir(),
     )
 
-    # 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's 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
-
-    # 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']
-            >
-            ipc_break['break_parent_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
 
-    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:
-            _err = kbi
-            if expect_final_exc is not KeyboardInterrupt:
-                pytest.fail(
-                    'Rxed unexpected KBI !?\n'
-                    f'{repr(kbi)}'
-                )
+    # 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
+        )
 
-            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,
+        # 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.EndOfChannel
+
+    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
@@ -238,29 +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
 
@@ -86,7 +84,7 @@ 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 `.result()` call
@@ -96,10 +94,10 @@ def test_remote_error(reg_addr, args_err):
 
         # ensure boxed errors
         for exc in excinfo.value.exceptions:
-            assert exc.boxed_type == errtype
+            assert exc.type == errtype
 
 
-def test_multierror(reg_addr):
+def test_multierror(arb_addr):
     '''
     Verify we raise a ``BaseExceptionGroup`` out of a nursery where
     more then one actor errors.
@@ -107,7 +105,7 @@ def test_multierror(reg_addr):
     '''
     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')
@@ -117,7 +115,7 @@ def test_multierror(reg_addr):
             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
 
@@ -132,14 +130,14 @@ def test_multierror(reg_addr):
 @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):
@@ -169,7 +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():
@@ -177,20 +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(
@@ -310,7 +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)
@@ -329,11 +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
@@ -412,7 +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,
@@ -422,7 +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,
@@ -437,16 +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

@@ -1,606 +0,0 @@
-'''
-Low-level functional audits for our
-"capability based messaging"-spec feats.
-
-B~)
-
-'''
-from typing import (
-    Any,
-    Type,
-    Union,
-)
-from contextvars import (
-    Context,
-)
-# from inspect import Parameter
-
-from msgspec import (
-    structs,
-    msgpack,
-    # defstruct,
-    Struct,
-    ValidationError,
-)
-import pytest
-import tractor
-from tractor.msg import (
-    _codec,
-    _ctxvar_MsgCodec,
-
-    NamespacePath,
-    MsgCodec,
-    mk_codec,
-    apply_codec,
-    current_codec,
-)
-from tractor.msg import (
-    types,
-)
-from tractor import _state
-from tractor.msg.types import (
-    # PayloadT,
-    Msg,
-    Started,
-    mk_msg_spec,
-)
-import trio
-
-
-def test_msg_spec_xor_pld_spec():
-    '''
-    If the `.msg.types.Msg`-set is overridden, we
-    can't also support a `Msg.pld` spec.
-
-    '''
-    # apply custom hooks and set a `Decoder` which only
-    # loads `NamespacePath` types.
-    with pytest.raises(RuntimeError):
-        mk_codec(
-            ipc_msg_spec=Any,
-            ipc_pld_spec=NamespacePath,
-        )
-
-
-def ex_func(*args):
-    print(f'ex_func({args})')
-
-
-def mk_custom_codec(
-    pld_spec: Union[Type]|Any,
-
-) -> MsgCodec:
-    '''
-    Create custom `msgpack` enc/dec-hooks and set a `Decoder`
-    which only loads `NamespacePath` types.
-
-    '''
-    uid: tuple[str, str] = tractor.current_actor().uid
-
-    # XXX NOTE XXX: despite defining `NamespacePath` as a type
-    # field on our `Msg.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:
-        match obj:
-            case NamespacePath():
-                print(
-                    f'{uid}: `NamespacePath`-Only ENCODE?\n'
-                    f'type: {type(obj)}\n'
-                    f'obj: {obj}\n'
-                )
-
-                return str(obj)
-
-        logmsg: str = (
-            f'{uid}: Encoding `{obj}: <{type(obj)}>` not supported'
-            f'type: {type(obj)}\n'
-            f'obj: {obj}\n'
-        )
-        print(logmsg)
-        raise NotImplementedError(logmsg)
-
-    def dec_nsp(
-        type: Type,
-        obj: Any,
-
-    ) -> Any:
-        print(
-            f'{uid}: CUSTOM DECODE\n'
-            f'input type: {type}\n'
-            f'obj: {obj}\n'
-            f'type(obj): `{type(obj).__class__}`\n'
-        )
-        nsp = None
-
-        # This never seems to hit?
-        if isinstance(obj, Msg):
-            print(f'Msg type: {obj}')
-
-        if (
-            type is NamespacePath
-            and isinstance(obj, str)
-            and ':' in obj
-        ):
-            nsp = NamespacePath(obj)
-
-        if nsp:
-            print(f'Returning NSP instance: {nsp}')
-            return nsp
-
-        logmsg: str = (
-            f'{uid}: Decoding `{obj}: <{type(obj)}>` not supported'
-            f'input type: {type(obj)}\n'
-            f'obj: {obj}\n'
-            f'type(obj): `{type(obj).__class__}`\n'
-        )
-        print(logmsg)
-        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,
-
-        # 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,
-    )
-    return nsp_codec
-
-
-@tractor.context
-async def send_back_nsp(
-    ctx: Context,
-    expect_debug: bool,
-    use_any_spec: bool,
-
-) -> None:
-    '''
-    Setup up a custom codec to load instances of `NamespacePath`
-    and ensure we can round trip a func ref with our parent.
-
-    '''
-    # debug mode sanity check
-    assert expect_debug == _state.debug_mode()
-
-    # task: trio.Task = trio.lowlevel.current_task()
-
-    # TreeVar
-    # curr_codec = _ctxvar_MsgCodec.get_in(task)
-
-    # ContextVar
-    # task_ctx: Context = task.context
-    # assert _ctxvar_MsgCodec not in task_ctx
-
-    curr_codec = _ctxvar_MsgCodec.get()
-    assert curr_codec is _codec._def_tractor_codec
-
-    if use_any_spec:
-        pld_spec = Any
-    else:
-        # NOTE: don't need the |None here since
-        # the parent side will never send `None` like
-        # we do here in the implicit return at the end of this
-        # `@context` body.
-        pld_spec = NamespacePath  # |None
-
-    nsp_codec: MsgCodec = mk_custom_codec(
-        pld_spec=pld_spec,
-    )
-    with apply_codec(nsp_codec) as codec:
-        chk_codec_applied(
-            custom_codec=nsp_codec,
-            enter_value=codec,
-        )
-
-        # ensure roundtripping works locally
-        nsp = NamespacePath.from_ref(ex_func)
-        wire_bytes: bytes = nsp_codec.encode(
-            Started(
-                cid=ctx.cid,
-                pld=nsp
-            )
-        )
-        msg: Started = nsp_codec.decode(wire_bytes)
-        pld = msg.pld
-        assert pld == nsp
-
-        await ctx.started(nsp)
-        async with ctx.open_stream() as ipc:
-            async for msg in ipc:
-
-                if use_any_spec:
-                    assert msg == f'{__name__}:ex_func'
-
-                    # TODO: as per below
-                    # assert isinstance(msg, NamespacePath)
-                    assert isinstance(msg, str)
-                else:
-                    assert isinstance(msg, NamespacePath)
-
-                await ipc.send(msg)
-
-
-def chk_codec_applied(
-    custom_codec: MsgCodec,
-    enter_value: MsgCodec,
-) -> MsgCodec:
-
-    # task: trio.Task = trio.lowlevel.current_task()
-
-    # TreeVar
-    # 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]
-
-    # RunVar
-    curr_codec: MsgCodec = _ctxvar_MsgCodec.get()
-    last_read_codec = _ctxvar_MsgCodec.get()
-    assert curr_codec is last_read_codec
-
-    assert (
-        # returned from `mk_codec()`
-        custom_codec is
-
-        # yielded value from `apply_codec()`
-        enter_value is
-
-        # read from current task's `contextvars.Context`
-        curr_codec is
-
-        # public API for all of the above
-        current_codec()
-
-        # the default `msgspec` settings
-        is not _codec._def_msgspec_codec
-        is not _codec._def_tractor_codec
-    )
-
-
-@pytest.mark.parametrize(
-    'ipc_pld_spec',
-    [
-        # _codec._def_msgspec_codec,
-        Any,
-        # _codec._def_tractor_codec,
-        NamespacePath|None,
-    ],
-    ids=[
-        'any_type',
-        'nsp_type',
-    ]
-)
-def test_codec_hooks_mod(
-    debug_mode: bool,
-    ipc_pld_spec: Union[Type]|Any,
-):
-    '''
-    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():
-
-        # task: trio.Task = trio.lowlevel.current_task()
-
-        # ContextVar
-        # task_ctx: Context = task.context
-        # assert _ctxvar_MsgCodec not in task_ctx
-
-        # TreeVar
-        # def_codec: MsgCodec = _ctxvar_MsgCodec.get_in(task)
-        def_codec = _ctxvar_MsgCodec.get()
-        assert def_codec is _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,
-            )
-            with apply_codec(nsp_codec) as codec:
-                chk_codec_applied(
-                    custom_codec=nsp_codec,
-                    enter_value=codec,
-                )
-
-                async with (
-                    p.open_context(
-                        send_back_nsp,
-                        # TODO: send the original nsp here and
-                        # test with `limit_msg_spec()` above?
-                        expect_debug=debug_mode,
-                        use_any_spec=(ipc_pld_spec==Any),
-
-                    ) as (ctx, first),
-                    ctx.open_stream() as ipc,
-                ):
-                    if ipc_pld_spec is NamespacePath:
-                        assert isinstance(first, NamespacePath)
-
-                    print(
-                        'root: ENTERING CONTEXT BLOCK\n'
-                        f'type(first): {type(first)}\n'
-                        f'first: {first}\n'
-                    )
-                    # ensure codec is still applied across
-                    # `tractor.Context` + its embedded nursery.
-                    chk_codec_applied(
-                        custom_codec=nsp_codec,
-                        enter_value=codec,
-                    )
-
-                    first_nsp = NamespacePath(first)
-
-                    # ensure roundtripping works
-                    wire_bytes: bytes = nsp_codec.encode(
-                        Started(
-                            cid=ctx.cid,
-                            pld=first_nsp
-                        )
-                    )
-                    msg: Started = nsp_codec.decode(wire_bytes)
-                    pld = msg.pld
-                    assert  pld == first_nsp
-
-                    # try a manual decode of the started msg+pld
-
-                    # TODO: actually get the decoder loading
-                    # to native once we spec our SCIPP msgspec
-                    # (structurred-conc-inter-proc-protocol)
-                    # implemented as per,
-                    # https://github.com/goodboy/tractor/issues/36
-                    #
-                    if ipc_pld_spec is NamespacePath:
-                        assert isinstance(first, NamespacePath)
-
-                    # `Any`-payload-spec case
-                    else:
-                        assert isinstance(first, str)
-                        assert first == f'{__name__}:ex_func'
-
-                    await ipc.send(first)
-
-                    with trio.move_on_after(.6):
-                        async for msg in ipc:
-                            print(msg)
-
-                            # TODO: as per above
-                            # assert isinstance(msg, NamespacePath)
-                            assert isinstance(msg, str)
-                            await ipc.send(msg)
-                            await trio.sleep(0.1)
-
-            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 `Msg.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[Msg[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 `Msg[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 types._payload_spec_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: Msg = 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 `Msg`
-            assert chk_pld_type(
-                # Msg,
-                Any,
-                None,
-                expect_roundtrip=True,
-            )
-
-            # TODO: don't need this any more right since
-            # `msgspec>=0.15` has the nice generics stuff yah??
-            #
-            # manually override the type annot of the payload
-            # field and ensure it propagates to all msg-subtypes.
-            # Msg.__annotations__['pld'] = Any
-
-            # verify that a mis-typed payload value won't decode
-            assert not chk_pld_type(
-                # Msg,
-                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(
-                # Msg,
-                CustomPayload,
-                pld='doggy',
-            )
-
-            assert chk_pld_type(
-                # Msg,
-                CustomPayload,
-                pld=CustomPayload(name='doggy', value='urmom')
-            )
-
-            # uhh bc we can `.pause_from_sync()` now! :surfer:
-            # 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_debugger.py

@@ -10,13 +10,12 @@ TODO:
     - wonder if any of it'll work on OS X?
 
 """
-from functools import partial
 import itertools
-# from os import path
+from os import path
 from typing import Optional
 import platform
 import pathlib
-# import sys
+import sys
 import time
 
 import pytest
@@ -26,14 +25,8 @@ from pexpect.exceptions import (
     EOF,
 )
 
-from tractor.devx._debug import (
-    _pause_msg,
-    _crash_msg,
-)
-from tractor._testing import (
-    examples_dir,
-)
 from conftest import (
+    examples_dir,
     _ci_env,
 )
 
@@ -85,7 +78,7 @@ has_nested_actors = pytest.mark.has_nested_actors
 def spawn(
     start_method,
     testdir,
-    reg_addr,
+    arb_addr,
 ) -> 'pexpect.spawn':
 
     if start_method != 'trio':
@@ -130,52 +123,20 @@ def expect(
         raise
 
 
-def in_prompt_msg(
-    prompt: str,
-    parts: list[str],
-
-    pause_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.
-
-    '''
-    for part in parts:
-        if part not in prompt:
-
-            if pause_on_false:
-                import pdbp
-                pdbp.set_trace()
-
-            if print_prompt_on_false:
-                print(prompt)
-
-            return False
-
-    return True
-
 def assert_before(
     child,
     patts: list[str],
 
-    **kwargs,
-
 ) -> None:
 
-    # as in before the prompt end
-    before: str = str(child.before.decode())
-    assert in_prompt_msg(
-        prompt=before,
-        parts=patts,
+    before = str(child.before.decode())
 
-        **kwargs
-    )
+    for patt in patts:
+        try:
+            assert patt in before
+        except AssertionError:
+            print(before)
+            raise
 
 
 @pytest.fixture(
@@ -205,7 +166,7 @@ def 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
+        from tractor._debug import TractorConfig
         TractorConfig.use_pygements = False
 
     yield use_ctlc
@@ -234,10 +195,7 @@ def test_root_actor_error(spawn, user_in_out):
     before = str(child.before.decode())
 
     # make sure expected logging and error arrives
-    assert in_prompt_msg(
-        before,
-        [_crash_msg, "('root'"]
-    )
+    assert "Attaching to pdb in crashed actor: ('root'" in before
     assert 'AssertionError' in before
 
     # send user command
@@ -374,10 +332,7 @@ def test_subactor_error(
     child.expect(PROMPT)
 
     before = str(child.before.decode())
-    assert in_prompt_msg(
-        before,
-        [_crash_msg, "('name_error'"]
-    )
+    assert "Attaching to pdb in crashed actor: ('name_error'" in before
 
     if do_next:
         child.sendline('n')
@@ -398,15 +353,9 @@ def test_subactor_error(
     before = str(child.before.decode())
 
     # root actor gets debugger engaged
-    assert in_prompt_msg(
-        before,
-        [_crash_msg, "('root'"]
-    )
+    assert "Attaching to pdb in crashed actor: ('root'" in before
     # error is a remote error propagated from the subactor
-    assert in_prompt_msg(
-        before,
-        [_crash_msg, "('name_error'"]
-    )
+    assert "RemoteActorError: ('name_error'" in before
 
     # another round
     if ctlc:
@@ -431,10 +380,7 @@ def test_subactor_breakpoint(
     child.expect(PROMPT)
 
     before = str(child.before.decode())
-    assert in_prompt_msg(
-        before,
-        [_pause_msg, "('breakpoint_forever'"]
-    )
+    assert "Attaching pdb to actor: ('breakpoint_forever'" in before
 
     # do some "next" commands to demonstrate recurrent breakpoint
     # entries
@@ -450,10 +396,7 @@ def test_subactor_breakpoint(
         child.sendline('continue')
         child.expect(PROMPT)
         before = str(child.before.decode())
-        assert in_prompt_msg(
-            before,
-            [_pause_msg, "('breakpoint_forever'"]
-        )
+        assert "Attaching pdb to actor: ('breakpoint_forever'" in before
 
         if ctlc:
             do_ctlc(child)
@@ -498,10 +441,7 @@ def test_multi_subactors(
     child.expect(PROMPT)
 
     before = str(child.before.decode())
-    assert in_prompt_msg(
-        before,
-        [_pause_msg, "('breakpoint_forever'"]
-    )
+    assert "Attaching pdb to actor: ('breakpoint_forever'" in before
 
     if ctlc:
         do_ctlc(child)
@@ -521,10 +461,7 @@ def test_multi_subactors(
     # first name_error failure
     child.expect(PROMPT)
     before = str(child.before.decode())
-    assert in_prompt_msg(
-        before,
-        [_crash_msg, "('name_error'"]
-    )
+    assert "Attaching to pdb in crashed actor: ('name_error'" in before
     assert "NameError" in before
 
     if ctlc:
@@ -550,10 +487,7 @@ def test_multi_subactors(
     child.sendline('c')
     child.expect(PROMPT)
     before = str(child.before.decode())
-    assert in_prompt_msg(
-        before,
-        [_pause_msg, "('breakpoint_forever'"]
-    )
+    assert "Attaching pdb to actor: ('breakpoint_forever'" in before
 
     if ctlc:
         do_ctlc(child)
@@ -593,21 +527,17 @@ def test_multi_subactors(
     child.expect(PROMPT)
     before = str(child.before.decode())
 
-    assert_before(
-        child, [
-            # debugger attaches to root
-            # "Attaching to pdb in crashed actor: ('root'",
-            _crash_msg,
-            "('root'",
+    assert_before(child, [
+        # debugger attaches to root
+        "Attaching to pdb in crashed actor: ('root'",
 
-            # expect a multierror with exceptions for each sub-actor
-            "RemoteActorError: ('breakpoint_forever'",
-            "RemoteActorError: ('name_error'",
-            "RemoteActorError: ('spawn_error'",
-            "RemoteActorError: ('name_error_1'",
-            'bdb.BdbQuit',
-        ]
-    )
+        # expect a multierror with exceptions for each sub-actor
+        "RemoteActorError: ('breakpoint_forever'",
+        "RemoteActorError: ('name_error'",
+        "RemoteActorError: ('spawn_error'",
+        "RemoteActorError: ('name_error_1'",
+        'bdb.BdbQuit',
+    ])
 
     if ctlc:
         do_ctlc(child)
@@ -644,22 +574,15 @@ def test_multi_daemon_subactors(
     # the root's tty lock first so anticipate either crash
     # message on the first entry.
 
-    bp_forev_parts = [_pause_msg, "('bp_forever'"]
-    bp_forev_in_msg = partial(
-        in_prompt_msg,
-        parts=bp_forev_parts,
-    )
-
+    bp_forever_msg = "Attaching pdb to actor: ('bp_forever'"
     name_error_msg = "NameError: name 'doggypants' is not defined"
-    name_error_parts = [name_error_msg]
 
     before = str(child.before.decode())
-
-    if bp_forev_in_msg(prompt=before):
-        next_parts = name_error_parts
+    if bp_forever_msg in before:
+        next_msg = name_error_msg
 
     elif name_error_msg in before:
-        next_parts = bp_forev_parts
+        next_msg = bp_forever_msg
 
     else:
         raise ValueError("Neither log msg was found !?")
@@ -676,10 +599,7 @@ def test_multi_daemon_subactors(
 
     child.sendline('c')
     child.expect(PROMPT)
-    assert_before(
-        child,
-        next_parts,
-    )
+    assert_before(child, [next_msg])
 
     # XXX: hooray the root clobbering the child here was fixed!
     # IMO, this demonstrates the true power of SC system design.
@@ -687,7 +607,7 @@ def test_multi_daemon_subactors(
     # now the root actor won't clobber the bp_forever child
     # during it's first access to the debug lock, but will instead
     # wait for the lock to release, by the edge triggered
-    # ``devx._debug.Lock.no_remote_has_tty`` event before sending cancel messages
+    # ``_debug.Lock.no_remote_has_tty`` event before sending cancel messages
     # (via portals) to its underlings B)
 
     # at some point here there should have been some warning msg from
@@ -703,15 +623,9 @@ def test_multi_daemon_subactors(
     child.expect(PROMPT)
 
     try:
-        assert_before(
-            child,
-            bp_forev_parts,
-        )
+        assert_before(child, [bp_forever_msg])
     except AssertionError:
-        assert_before(
-            child,
-            name_error_parts,
-        )
+        assert_before(child, [name_error_msg])
 
     else:
         if ctlc:
@@ -723,10 +637,7 @@ def test_multi_daemon_subactors(
 
         child.sendline('c')
         child.expect(PROMPT)
-        assert_before(
-            child,
-            name_error_parts,
-        )
+        assert_before(child, [name_error_msg])
 
     # wait for final error in root
     # where it crashs with boxed error
@@ -736,7 +647,7 @@ def test_multi_daemon_subactors(
             child.expect(PROMPT)
             assert_before(
                 child,
-                bp_forev_parts
+                [bp_forever_msg]
             )
         except AssertionError:
             break
@@ -745,9 +656,7 @@ def test_multi_daemon_subactors(
         child,
         [
             # boxed error raised in root task
-            # "Attaching to pdb in crashed actor: ('root'",
-            _crash_msg,
-            "('root'",
+            "Attaching to pdb in crashed actor: ('root'",
             "_exceptions.RemoteActorError: ('name_error'",
         ]
     )
@@ -861,7 +770,7 @@ def test_multi_nested_subactors_error_through_nurseries(
 
     child = spawn('multi_nested_subactors_error_up_through_nurseries')
 
-    # timed_out_early: bool = False
+    timed_out_early: bool = False
 
     for send_char in itertools.cycle(['c', 'q']):
         try:
@@ -962,14 +871,11 @@ def test_root_nursery_cancels_before_child_releases_tty_lock(
 
     if not timed_out_early:
         before = str(child.before.decode())
-        assert_before(
-            child,
-            [
-                "tractor._exceptions.RemoteActorError: ('spawner0'",
-                "tractor._exceptions.RemoteActorError: ('name_error'",
-                "NameError: name 'doggypants' is not defined",
-            ],
-        )
+        assert_before(child, [
+            "tractor._exceptions.RemoteActorError: ('spawner0'",
+            "tractor._exceptions.RemoteActorError: ('name_error'",
+            "NameError: name 'doggypants' is not defined",
+        ])
 
 
 def test_root_cancels_child_context_during_startup(
@@ -1003,10 +909,8 @@ def test_different_debug_mode_per_actor(
 
     # only one actor should enter the debugger
     before = str(child.before.decode())
-    assert in_prompt_msg(
-        before,
-        [_crash_msg, "('debugged_boi'", "RuntimeError"],
-    )
+    assert "Attaching to pdb in crashed actor: ('debugged_boi'" in before
+    assert "RuntimeError" in before
 
     if ctlc:
         do_ctlc(child)
@@ -1027,67 +931,3 @@ def test_different_debug_mode_per_actor(
     # instead crashed completely
     assert "tractor._exceptions.RemoteActorError: ('crash_boi'" in before
     assert "RuntimeError" in before
-
-
-
-def test_pause_from_sync(
-    spawn,
-    ctlc: bool
-):
-    '''
-    Verify we can use the `pdbp` REPL from sync functions AND from
-    any thread spawned with `trio.to_thread.run_sync()`.
-
-    `examples/debugging/sync_bp.py`
-
-    '''
-    child = spawn('sync_bp')
-    child.expect(PROMPT)
-    assert_before(
-        child,
-        [
-            '`greenback` portal opened!',
-            # pre-prompt line
-            _pause_msg, "('root'",
-        ]
-    )
-    if ctlc:
-        do_ctlc(child)
-    child.sendline('c')
-    child.expect(PROMPT)
-
-    # XXX shouldn't see gb loaded again
-    before = str(child.before.decode())
-    assert not in_prompt_msg(
-        before,
-        ['`greenback` portal opened!'],
-    )
-    assert_before(
-        child,
-        [_pause_msg, "('root'",],
-    )
-
-    if ctlc:
-        do_ctlc(child)
-    child.sendline('c')
-    child.expect(PROMPT)
-    assert_before(
-        child,
-        [_pause_msg, "('subactor'",],
-    )
-
-    if ctlc:
-        do_ctlc(child)
-    child.sendline('c')
-    child.expect(PROMPT)
-    # non-main thread case
-    # TODO: should we agument the pre-prompt msg in this case?
-    assert_before(
-        child,
-        [_pause_msg, "('root'",],
-    )
-
-    if ctlc:
-        do_ctlc(child)
-    child.sendline('c')
-    child.expect(pexpect.EOF)

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_arbiter(*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_arbiter(*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_arbiter(*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,
 )
 
@@ -20,7 +21,7 @@ from tractor._testing import (
 def run_example_in_subproc(
     loglevel: str,
     testdir,
-    reg_addr: tuple[str, int],
+    arb_addr: tuple[str, int],
 ):
 
     @contextmanager

tests/test_infected_asyncio.py

@@ -8,16 +8,15 @@ import builtins
 import itertools
 import importlib
 
+from exceptiongroup import BaseExceptionGroup
 import pytest
 import trio
 import tractor
 from tractor import (
     to_asyncio,
     RemoteActorError,
-    ContextCancelled,
 )
 from tractor.trionics import BroadcastReceiver
-from tractor._testing import expect_ctxc
 
 
 async def sleep_and_err(
@@ -47,7 +46,7 @@ async def trio_cancels_single_aio_task():
         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.
@@ -55,7 +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,
@@ -68,7 +67,7 @@ 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:
 
@@ -94,7 +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.
@@ -103,7 +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,
@@ -112,26 +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 == 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.
 
@@ -150,7 +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.
@@ -201,12 +189,11 @@ async def trio_ctx(
 
 
 @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,
 ):
     '''
@@ -226,53 +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 == AssertionError
+        assert err.type == AssertionError
 
 
 async def aio_cancel():
@@ -288,7 +248,7 @@ async def aio_cancel():
     await sleep_forever()
 
 
-def test_aio_cancelled_from_aio_causes_trio_cancelled(reg_addr):
+def test_aio_cancelled_from_aio_causes_trio_cancelled(arb_addr):
 
     async def main():
         async with tractor.open_nursery() as n:
@@ -299,22 +259,11 @@ def test_aio_cancelled_from_aio_causes_trio_cancelled(reg_addr):
                 infect_asyncio=True,
             )
 
-    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 = excinfo.value
-    if isinstance(err, ExceptionGroup):
-        err = next(itertools.dropwhile(
-            lambda exc: not isinstance(exc, tractor.RemoteActorError),
-            err.exceptions
-        ))
-        assert err
-
     # ensure boxed error is correct
-    assert err.boxed_type == to_asyncio.AsyncioCancelled
+    assert excinfo.value.type == to_asyncio.AsyncioCancelled
 
 
 # TODO: verify open_channel_from will fail on this..
@@ -436,7 +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(
@@ -450,7 +399,7 @@ def test_basic_interloop_channel_stream(reg_addr, fan_out):
 
 
 # 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(
@@ -466,10 +415,10 @@ def test_trio_error_cancels_intertask_chan(reg_addr):
 
     # ensure boxed errors
     for exc in excinfo.value.exceptions:
-        assert exc.boxed_type == Exception
+        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(
@@ -484,7 +433,7 @@ def test_trio_closes_early_and_channel_exits(reg_addr):
     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(
@@ -500,7 +449,7 @@ def test_aio_errors_and_channel_propagates_and_closes(reg_addr):
 
     # ensure boxed errors
     for exc in excinfo.value.exceptions:
-        assert exc.boxed_type == Exception
+        assert exc.type == Exception
 
 
 @tractor.context
@@ -561,7 +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,
 ):
 
@@ -601,8 +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
@@ -614,37 +562,3 @@ def test_echoserver_detailed_mechanics(
 
     else:
         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():
@@ -55,7 +55,7 @@ async def context_stream(
 
 
 async def stream_from_single_subactor(
-    reg_addr,
+    arb_addr,
     start_method,
     stream_func,
 ):
@@ -64,7 +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:
 
@@ -115,13 +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,
         ),
@@ -225,14 +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...
         """
@@ -240,7 +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
@@ -260,14 +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
@@ -280,7 +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_arbiter(*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_arbiter(*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_arbiter(*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_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

@@ -8,7 +8,7 @@ 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}
 
@@ -16,14 +16,14 @@ 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()
@@ -32,7 +32,8 @@ async def spawn(
 
         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
 
@@ -141,7 +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(
@@ -153,7 +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

@@ -15,50 +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_arbiter as get_arbiter,
-    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_actor,
+    is_root_process,
 )
 from ._exceptions import (
-    RemoteActorError as RemoteActorError,
-    ModuleNotExposed as ModuleNotExposed,
-    ContextCancelled as ContextCancelled,
+    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
@@ -35,6 +37,8 @@ def parse_ipaddr(arg):
     return (str(host), int(port))
 
 
+from ._entry import _trio_main
+
 if __name__ == "__main__":
 
     parser = argparse.ArgumentParser()

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

@@ -15,82 +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
-import warnings
 
-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
+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,
-]:
-    '''
-    Return a portal instance connected to a local or remote
+) -> AsyncGenerator[Union[Portal, LocalPortal], None]:
+    '''Return a portal instance connected to a local or remote
     arbiter.
-
     '''
     actor = current_actor()
 
     if not actor:
         raise RuntimeError("No actor instance has been defined yet?")
 
-    if actor.is_registrar:
+    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:
-        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:
 
-
-# TODO: deprecate and this remove _arbiter form!
-@acm
-async def get_arbiter(*args, **kwargs):
-    warnings.warn(
-        '`tractor.get_arbiter()` is now deprecated!\n'
-        'Use `.get_registry()` instead!',
-        DeprecationWarning,
-        stacklevel=2,
-    )
-    async with get_registry(*args, **kwargs) as to_yield:
-        yield to_yield
+                yield arb_portal
 
 
 @acm
@@ -98,80 +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
+    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,
-    arbiter_sockaddr: tuple[str, int] | None = None,
-    regaddr: tuple[str, int] | None = None,
+    arbiter_sockaddr: Optional[tuple[str, int]] = None,
 
-) -> AsyncGenerator[
-    tuple[str, int] | None,
-    None,
-]:
+) -> AsyncGenerator[tuple[str, int], None]:
     '''
-    Make a transport address lookup for an actor name to a specific
-    registrar.
+    Simple address lookup for a given actor name.
 
-    Returns the (socket) address or ``None`` if no entry under that
-    name exists for the given registrar listening @ `regaddr`.
+    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:
 
-    if arbiter_sockaddr is not None:
-        warnings.warn(
-            '`tractor.query_actor(regaddr=<blah>)` is deprecated.\n'
-            'Use `registry_addrs: list[tuple]` instead!',
-            DeprecationWarning,
-            stacklevel=2,
-        )
-        regaddr: list[tuple[str, int]] = arbiter_sockaddr
-
-    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")
+
+        yield sockaddr if sockaddr else None
 
 
 @acm
 async def find_actor(
     name: str,
-    arbiter_sockaddr: tuple[str, int]|None = None,
-    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.
 
@@ -179,116 +118,39 @@ async def find_actor(
     known to the arbiter.
 
     '''
-    if arbiter_sockaddr is not None:
-        warnings.warn(
-            '`tractor.find_actor(arbiter_sockaddr=<blah>)` is deprecated.\n'
-            'Use `registry_addrs: list[tuple]` instead!',
-            DeprecationWarning,
-            stacklevel=2,
-        )
-        registry_addrs: list[tuple[str, int]] = [arbiter_sockaddr]
-
-    @acm
-    async def maybe_open_portal_from_reg_addr(
-        addr: tuple[str, int],
-    ):
-        async with query_actor(
-            name=name,
-            regaddr=addr,
-        ) as sockaddr:
-            if sockaddr:
-                async with _connect_chan(*sockaddr) as chan:
-                    async with open_portal(chan) as portal:
-                        yield portal
-            else:
-                yield None
-
-    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_from_reg_addr(addr)
-        for addr in registry_addrs
-    )
-
-    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,
-    arbiter_sockaddr: tuple[str, int] | None = None,
-    registry_addr: tuple[str, int] | None = None,
-
+    arbiter_sockaddr: tuple[str, int] | None = None
 ) -> AsyncGenerator[Portal, None]:
-    '''
-    Wait on an actor to register with the arbiter.
+    """Wait on an actor to register with the arbiter.
 
     A portal to the first registered actor is returned.
+    """
+    actor = current_actor()
 
-    '''
-    actor: Actor = current_actor()
-
-    if arbiter_sockaddr is not None:
-        warnings.warn(
-            '`tractor.wait_for_actor(arbiter_sockaddr=<foo>)` is deprecated.\n'
-            'Use `registry_addr: tuple` instead!',
-            DeprecationWarning,
-            stacklevel=2,
-        )
-        registry_addr: tuple[str, int] = arbiter_sockaddr
-
-    # TODO: use `.trionics.gather_contexts()` like
-    # above in `find_actor()` as well?
-    reg_portal: Portal
-    regaddr: tuple[str, int] = registry_addr or actor.reg_addrs[0]
-    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

@@ -47,8 +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,
@@ -77,8 +77,8 @@ def _mp_main(
     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:
@@ -96,7 +96,7 @@ def _mp_main(
 
 def _trio_main(
 
-    actor: Actor,
+    actor: Actor,  # type: ignore
     *,
     parent_addr: tuple[str, int] | None = None,
     infect_asyncio: bool = False,
@@ -106,29 +106,25 @@ def _trio_main(
     Entry point for a `trio_run_in_process` subactor.
 
     '''
+    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)
-        import os
-        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(
-            'Started new trio process:\n'
-            +
-            actor_info
-        )
-
     try:
         if infect_asyncio:
             actor._infected_aio = True
@@ -136,15 +132,7 @@ def _trio_main(
         else:
             trio.run(trio_main)
     except KeyboardInterrupt:
-        log.cancel(
-            'Actor received KBI\n'
-            +
-            actor_info
-        )
+        log.warning(f"Actor {actor.uid} received KBI")
 
     finally:
-        log.info(
-            'Actor terminated\n'
-            +
-            actor_info
-        )
+        log.info(f"Actor {actor.uid} terminated")

tractor/_exceptions.py

@@ -14,34 +14,22 @@
 # 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/>.
 
-'''
+"""
 Our classy exception set.
 
-'''
-from __future__ import annotations
-import builtins
-import importlib
-from pprint import pformat
+"""
 from typing import (
     Any,
+    Optional,
     Type,
-    TYPE_CHECKING,
 )
-import textwrap
+import importlib
+import builtins
 import traceback
 
+import exceptiongroup as eg
 import trio
 
-from tractor._state import current_actor
-from tractor.log import get_logger
-
-if TYPE_CHECKING:
-    from ._context import Context
-    from .log import StackLevelAdapter
-    from ._stream import MsgStream
-    from ._ipc import Channel
-
-log = get_logger('tractor')
 
 _this_mod = importlib.import_module(__name__)
 
@@ -50,381 +38,36 @@ class ActorFailure(Exception):
     "General actor failure"
 
 
-class InternalError(RuntimeError):
-    '''
-    Entirely unexpected internal machinery error indicating
-    a completely invalid state or interface.
-
-    '''
-
-_body_fields: list[str] = [
-    'boxed_type',
-    'src_type',
-    # TODO: format this better if we're going to include it.
-    # 'relay_path',
-    'src_uid',
-
-    # only in sub-types
-    'canceller',
-    'sender',
-]
-
-_msgdata_keys: list[str] = [
-    'boxed_type_str',
-] + _body_fields
-
-
-def get_err_type(type_name: str) -> BaseException|None:
-    '''
-    Look up an exception type by name from the set of locally
-    known namespaces:
-
-    - `builtins`
-    - `tractor._exceptions`
-    - `trio`
-
-    '''
-    for ns in [
-        builtins,
-        _this_mod,
-        trio,
-    ]:
-        if type_ref := getattr(
-            ns,
-            type_name,
-            False,
-        ):
-            return type_ref
-
-
-# TODO: rename to just `RemoteError`?
 class RemoteActorError(Exception):
-    '''
-    A box(ing) type which bundles a remote actor `BaseException` for
-    (near identical, and only if possible,) local object/instance
-    re-construction in the local process memory domain.
-
-    Normally each instance is expected to be constructed from
-    a special "error" IPC msg sent by some remote actor-runtime.
-
-    '''
-    reprol_fields: list[str] = [
-        'src_uid',
-        'relay_path',
-    ]
-
+    # TODO: local recontruction of remote exception deats
+    "Remote actor exception bundled locally"
     def __init__(
         self,
         message: str,
-        boxed_type: Type[BaseException]|None = None,
+        suberror_type: Optional[Type[BaseException]] = None,
         **msgdata
 
     ) -> None:
         super().__init__(message)
 
-        # TODO: maybe a better name?
-        # - .errtype
-        # - .retype
-        # - .boxed_errtype
-        # - .boxed_type
-        # - .remote_type
-        # also pertains to our long long oustanding issue XD
-        # https://github.com/goodboy/tractor/issues/5
-        #
-        # TODO: always set ._boxed_type` as `None` by default
-        # and instead render if from `.boxed_type_str`?
-        self._boxed_type: BaseException = boxed_type
-        self._src_type: BaseException|None = None
-        self.msgdata: dict[str, Any] = msgdata
-
-        # TODO: mask out eventually or place in `pack_error()`
-        # pre-`return` lines?
-        # sanity on inceptions
-        if boxed_type is RemoteActorError:
-            assert self.src_type_str != 'RemoteActorError'
-            assert self.src_uid not in self.relay_path
-
-        # ensure type-str matches and round-tripping from that
-        # str results in same error type.
-        #
-        # TODO NOTE: this is currently exclusively for the
-        # `ContextCancelled(boxed_type=trio.Cancelled)` case as is
-        # used inside `._rpc._invoke()` atm though probably we
-        # should better emphasize that special (one off?) case
-        # either by customizing `ContextCancelled.__init__()` or
-        # through a special factor func?
-        elif boxed_type:
-            if not self.msgdata.get('boxed_type_str'):
-                self.msgdata['boxed_type_str'] = str(
-                    type(boxed_type).__name__
-                )
-
-            assert self.boxed_type_str == self.msgdata['boxed_type_str']
-            assert self.boxed_type is boxed_type
-
-    @property
-    def src_type_str(self) -> str:
-        '''
-        String-name of the source error's type.
-
-        This should be the same as `.boxed_type_str` when unpacked
-        at the first relay/hop's receiving actor.
-
-        '''
-        return self.msgdata['src_type_str']
-
-    @property
-    def src_type(self) -> str:
-        '''
-        Error type raised by original remote faulting actor.
-
-        '''
-        if self._src_type is None:
-            self._src_type = get_err_type(
-                self.msgdata['src_type_str']
-            )
-
-        return self._src_type
-
-    @property
-    def boxed_type_str(self) -> str:
-        '''
-        String-name of the (last hop's) boxed error type.
-
-        '''
-        return self.msgdata['boxed_type_str']
-
-    @property
-    def boxed_type(self) -> str:
-        '''
-        Error type boxed by last actor IPC hop.
-
-        '''
-        if self._boxed_type is None:
-            self._boxed_type = get_err_type(
-                self.msgdata['boxed_type_str']
-            )
-
-        return self._boxed_type
-
-    @property
-    def relay_path(self) -> list[tuple]:
-        '''
-        Return the list of actors which consecutively relayed
-        a boxed `RemoteActorError` the src error up until THIS
-        actor's hop.
-
-        NOTE: a `list` field with the same name is expected to be
-        passed/updated in `.msgdata`.
-
-        '''
-        return self.msgdata['relay_path']
-
-    @property
-    def relay_uid(self) -> tuple[str, str]|None:
-        return tuple(
-            self.msgdata['relay_path'][-1]
-        )
-
-    @property
-    def src_uid(self) -> tuple[str, str]|None:
-        if src_uid := (
-            self.msgdata.get('src_uid')
-        ):
-            return tuple(src_uid)
-        # TODO: use path lookup instead?
-        # return tuple(
-        #     self.msgdata['relay_path'][0]
-        # )
-
-    @property
-    def tb_str(
-        self,
-        indent: str = ' '*3,
-    ) -> str:
-        if remote_tb := self.msgdata.get('tb_str'):
-            return textwrap.indent(
-                remote_tb,
-                prefix=indent,
-            )
-
-        return ''
-
-    def _mk_fields_str(
-        self,
-        fields: list[str],
-        end_char: str = '\n',
-    ) -> str:
-        _repr: str = ''
-        for key in fields:
-            val: Any|None = (
-                getattr(self, key, None)
-                or
-                self.msgdata.get(key)
-            )
-            # TODO: for `.relay_path` on multiline?
-            # if not isinstance(val, str):
-            #     val_str = pformat(val)
-            # else:
-            val_str: str = repr(val)
-
-            if val:
-                _repr += f'{key}={val_str}{end_char}'
-
-        return _repr
-
-    def reprol(self) -> str:
-        '''
-        Represent this error for "one line" display, like in
-        a field of our `Context.__repr__()` output.
-
-        '''
-        # TODO: use this matryoshka emjoi XD
-        # => 🪆
-        reprol_str: str = f'{type(self).__name__}('
-        _repr: str = self._mk_fields_str(
-            self.reprol_fields,
-            end_char=' ',
-        )
-        return (
-            reprol_str
-            +
-            _repr
-        )
-
-    def __repr__(self) -> str:
-        '''
-        Nicely formatted boxed error meta data + traceback.
-
-        '''
-        fields: str = self._mk_fields_str(
-            _body_fields,
-        )
-        fields: str = textwrap.indent(
-            fields,
-            # prefix=' '*2,
-            prefix=' |_',
-        )
-        indent: str = ''*1
-        body: str = (
-            f'{fields}'
-            f'  |\n'
-            f'   ------ - ------\n\n'
-            f'{self.tb_str}\n'
-            f'   ------ - ------\n'
-            f' _|\n'
-        )
-        if indent:
-            body: str = textwrap.indent(
-                body,
-                prefix=indent,
-            )
-        return (
-            f'<{type(self).__name__}(\n'
-            f'{body}'
-            ')>'
-        )
-
-    def unwrap(
-        self,
-    ) -> BaseException:
-        '''
-        Unpack the inner-most source error from it's original IPC msg data.
-
-        We attempt to reconstruct (as best as we can) the original
-        `Exception` from as it would have been raised in the
-        failing actor's remote env.
-
-        '''
-        src_type_ref: Type[BaseException] = self.src_type
-        if not src_type_ref:
-            raise TypeError(
-                'Failed to lookup src error type:\n'
-                f'{self.src_type_str}'
-            )
-
-        # TODO: better tb insertion and all the fancier dunder
-        # metadata stuff as per `.__context__` etc. and friends:
-        # https://github.com/python-trio/trio/issues/611
-        return src_type_ref(self.tb_str)
-
-    # TODO: local recontruction of nested inception for a given
-    # "hop" / relay-node in this error's relay_path?
-    # => so would render a `RAE[RAE[RAE[Exception]]]` instance
-    #   with all inner errors unpacked?
-    # -[ ] if this is useful shouldn't be too hard to impl right?
-    # def unbox(self) -> BaseException:
-    #     '''
-    #     Unbox to the prior relays (aka last boxing actor's)
-    #     inner error.
-
-    #     '''
-    #     if not self.relay_path:
-    #         return self.unwrap()
-
-    #     # TODO..
-    #     # return self.boxed_type(
-    #     #     boxed_type=get_type_ref(..
-    #     raise NotImplementedError
+        self.type = suberror_type
+        self.msgdata = msgdata
 
 
 class InternalActorError(RemoteActorError):
-    '''
-    (Remote) internal `tractor` error indicating failure of some
-    primitive, machinery state or lowlevel task that should never
-    occur.
-
-    '''
-
-
-class ContextCancelled(RemoteActorError):
-    '''
-    Inter-actor task context was cancelled by either a call to
-    ``Portal.cancel_actor()`` or ``Context.cancel()``.
-
-    '''
-    reprol_fields: list[str] = [
-        'canceller',
-    ]
-    @property
-    def canceller(self) -> tuple[str, str]|None:
-        '''
-        Return the (maybe) `Actor.uid` for the requesting-author
-        of this ctxc.
-
-        Emit a warning msg when `.canceller` has not been set,
-        which usually idicates that a `None` msg-loop setinel was
-        sent before expected in the runtime. This can happen in
-        a few situations:
-
-        - (simulating) an IPC transport network outage
-        - a (malicious) pkt sent specifically to cancel an actor's
-          runtime non-gracefully without ensuring ongoing RPC tasks are 
-          incrementally cancelled as is done with:
-          `Actor`
-          |_`.cancel()`
-          |_`.cancel_soon()`
-          |_`._cancel_task()`
-
-        '''
-        value = self.msgdata.get('canceller')
-        if value:
-            return tuple(value)
-
-        log.warning(
-            'IPC Context cancelled without a requesting actor?\n'
-            'Maybe the IPC transport ended abruptly?\n\n'
-            f'{self}'
-        )
-
-    # TODO: to make `.__repr__()` work uniformly?
-    # src_actor_uid = canceller
+    """Remote internal ``tractor`` error indicating
+    failure of some primitive or machinery.
+    """
 
 
 class TransportClosed(trio.ClosedResourceError):
     "Underlying channel transport was closed prior to use"
 
 
+class ContextCancelled(RemoteActorError):
+    "Inter-actor task context cancelled itself on the callee side."
+
+
 class NoResult(RuntimeError):
     "No final result is expected for this actor"
 
@@ -437,22 +80,8 @@ class NoRuntime(RuntimeError):
     "The root actor has not been initialized yet"
 
 
-class StreamOverrun(
-    RemoteActorError,
-    trio.TooSlowError,
-):
-    reprol_fields: list[str] = [
-        'sender',
-    ]
-    '''
-    This stream was overrun by sender
-
-    '''
-    @property
-    def sender(self) -> tuple[str, str] | None:
-        value = self.msgdata.get('sender')
-        if value:
-            return tuple(value)
+class StreamOverrun(trio.TooSlowError):
+    "This stream was overrun by sender"
 
 
 class AsyncioCancelled(Exception):
@@ -463,143 +92,71 @@ class AsyncioCancelled(Exception):
 
     '''
 
-class MessagingError(Exception):
-    'Some kind of unexpected SC messaging dialog issue'
-
 
 def pack_error(
-    exc: BaseException|RemoteActorError,
+    exc: BaseException,
+    tb=None,
 
-    tb: str|None = None,
-    cid: str|None = None,
-
-) -> dict[str, dict]:
-    '''
-    Create an "error message" which boxes a locally caught
-    exception's meta-data and encodes it for wire transport via an
-    IPC `Channel`; expected to be unpacked (and thus unboxed) on
-    the receiver side using `unpack_error()` below.
-
-    '''
+) -> dict[str, Any]:
+    """Create an "error message" for tranmission over
+    a channel (aka the wire).
+    """
     if tb:
         tb_str = ''.join(traceback.format_tb(tb))
     else:
         tb_str = traceback.format_exc()
 
-    error_msg: dict[  # for IPC
-        str,
-        str | tuple[str, str]
-    ] = {}
-    our_uid: tuple = current_actor().uid
-
-    if (
-        isinstance(exc, RemoteActorError)
-    ):
-        error_msg.update(exc.msgdata)
-
-    # an onion/inception we need to pack
-    if (
-        type(exc) is RemoteActorError
-        and (boxed := exc.boxed_type)
-        and boxed != RemoteActorError
-    ):
-        # sanity on source error (if needed when tweaking this)
-        assert (src_type := exc.src_type) != RemoteActorError
-        assert error_msg['src_type_str'] != 'RemoteActorError'
-        assert error_msg['src_type_str'] == src_type.__name__
-        assert error_msg['src_uid'] != our_uid
-
-        # set the boxed type to be another boxed type thus
-        # creating an "inception" when unpacked by
-        # `unpack_error()` in another actor who gets "relayed"
-        # this error Bo
-        #
-        # NOTE on WHY: since we are re-boxing and already
-        # boxed src error, we want to overwrite the original
-        # `boxed_type_str` and instead set it to the type of
-        # the input `exc` type.
-        error_msg['boxed_type_str'] = 'RemoteActorError'
-
-    else:
-        error_msg['src_uid'] = our_uid
-        error_msg['src_type_str'] =  type(exc).__name__
-        error_msg['boxed_type_str'] = type(exc).__name__
-
-    # XXX alawys append us the last relay in error propagation path
-    error_msg.setdefault(
-        'relay_path',
-        [],
-    ).append(our_uid)
-
-    # XXX NOTE: always ensure the traceback-str is from the
-    # locally raised error (**not** the prior relay's boxed
-    # content's `.msgdata`).
-    error_msg['tb_str'] = tb_str
-
-    pkt: dict = {
-        'error': error_msg,
+    return {
+        'error': {
+            'tb_str': tb_str,
+            'type_str': type(exc).__name__,
+        }
     }
-    if cid:
-        pkt['cid'] = cid
-
-    return pkt
 
 
 def unpack_error(
+
     msg: dict[str, Any],
+    chan=None,
+    err_type=RemoteActorError
 
-    chan: Channel|None = None,
-    box_type: RemoteActorError = RemoteActorError,
-
-    hide_tb: bool = True,
-
-) -> None|Exception:
+) -> Exception:
     '''
     Unpack an 'error' message from the wire
-    into a local `RemoteActorError` (subtype).
-
-    NOTE: this routine DOES not RAISE the embedded remote error,
-    which is the responsibilitiy of the caller.
+    into a local ``RemoteActorError``.
 
     '''
-    __tracebackhide__: bool = hide_tb
+    __tracebackhide__ = True
+    error = msg['error']
 
-    error_dict: dict[str, dict] | None
-    if (
-        error_dict := msg.get('error')
-    ) is None:
-        # no error field, nothing to unpack.
-        return None
+    tb_str = error.get('tb_str', '')
+    message = f"{chan.uid}\n" + tb_str
+    type_name = error['type_str']
+    suberror_type: Type[BaseException] = Exception
 
-    # retrieve the remote error's msg encoded details
-    tb_str: str = error_dict.get('tb_str', '')
-    message: str = (
-        f'{chan.uid}\n'
-        +
-        tb_str
-    )
+    if type_name == 'ContextCancelled':
+        err_type = ContextCancelled
+        suberror_type = trio.Cancelled
 
-    # try to lookup a suitable error type from the local runtime
-    # env then use it to construct a local instance.
-    boxed_type_str: str = error_dict['boxed_type_str']
-    boxed_type: Type[BaseException] = get_err_type(boxed_type_str)
+    else:  # try to lookup a suitable local error type
+        for ns in [
+            builtins,
+            _this_mod,
+            eg,
+            trio,
+        ]:
+            try:
+                suberror_type = getattr(ns, type_name)
+                break
+            except AttributeError:
+                continue
 
-    if boxed_type_str == 'ContextCancelled':
-        box_type = ContextCancelled
-        assert boxed_type is box_type
-
-    # TODO: already included by `_this_mod` in else loop right?
-    #
-    # we have an inception/onion-error so ensure
-    # we include the relay_path info and the
-    # original source error.
-    elif boxed_type_str == 'RemoteActorError':
-        assert boxed_type is RemoteActorError
-        assert len(error_dict['relay_path']) >= 1
-
-    exc = box_type(
+    exc = err_type(
         message,
-        **error_dict,
+        suberror_type=suberror_type,
+
+        # unpack other fields into error type init
+        **msg['error'],
     )
 
     return exc
@@ -607,132 +164,14 @@ def unpack_error(
 
 def is_multi_cancelled(exc: BaseException) -> bool:
     '''
-    Predicate to determine if a possible ``BaseExceptionGroup`` contains
+    Predicate to determine if a possible ``eg.BaseExceptionGroup`` contains
     only ``trio.Cancelled`` sub-exceptions (and is likely the result of
     cancelling a collection of subtasks.
 
     '''
-    # if isinstance(exc, eg.BaseExceptionGroup):
-    if isinstance(exc, BaseExceptionGroup):
+    if isinstance(exc, eg.BaseExceptionGroup):
         return exc.subgroup(
             lambda exc: isinstance(exc, trio.Cancelled)
         ) is not None
 
     return False
-
-
-def _raise_from_no_key_in_msg(
-    ctx: Context,
-    msg: dict,
-    src_err: KeyError,
-    log: StackLevelAdapter,  # caller specific `log` obj
-
-    expect_key: str = 'yield',
-    stream: MsgStream | None = None,
-
-    # allow "deeper" tbs when debugging B^o
-    hide_tb: bool = True,
-
-) -> bool:
-    '''
-    Raise an appopriate local error when a
-    `MsgStream` msg arrives which does not
-    contain the expected (at least under normal
-    operation) `'yield'` field.
-
-    `Context` and any embedded `MsgStream` termination,
-    as well as remote task errors are handled in order
-    of priority as:
-
-    - any 'error' msg is re-boxed and raised locally as
-      -> `RemoteActorError`|`ContextCancelled`
-
-    - a `MsgStream` 'stop' msg is constructed, assigned
-      and raised locally as -> `trio.EndOfChannel`
-
-    - All other mis-keyed msgss (like say a "final result"
-      'return' msg, normally delivered from `Context.result()`)
-      are re-boxed inside a `MessagingError` with an explicit
-      exc content describing the missing IPC-msg-key.
-
-    '''
-    __tracebackhide__: bool = hide_tb
-
-    # an internal error should never get here
-    try:
-        cid: str = msg['cid']
-    except KeyError as src_err:
-        raise MessagingError(
-            f'IPC `Context` rx-ed msg without a ctx-id (cid)!?\n'
-            f'cid: {cid}\n\n'
-
-            f'{pformat(msg)}\n'
-        ) from src_err
-
-    # TODO: test that shows stream raising an expected error!!!
-
-    # raise the error message in a boxed exception type!
-    if msg.get('error'):
-        raise unpack_error(
-            msg,
-            ctx.chan,
-            hide_tb=hide_tb,
-
-        ) from None
-
-    # `MsgStream` termination msg.
-    # TODO: does it make more sense to pack 
-    # the stream._eoc outside this in the calleer always?
-    elif (
-        msg.get('stop')
-        or (
-            stream
-            and stream._eoc
-        )
-    ):
-        log.debug(
-            f'Context[{cid}] stream was stopped by remote side\n'
-            f'cid: {cid}\n'
-        )
-
-        # TODO: if the a local task is already blocking on
-        # a `Context.result()` and thus a `.receive()` on the
-        # rx-chan, we close the chan and set state ensuring that
-        # an eoc is raised!
-
-        # XXX: this causes ``ReceiveChannel.__anext__()`` to
-        # raise a ``StopAsyncIteration`` **and** in our catch
-        # block below it will trigger ``.aclose()``.
-        eoc = trio.EndOfChannel(
-            f'Context stream ended due to msg:\n\n'
-            f'{pformat(msg)}\n'
-        )
-        # XXX: important to set so that a new `.receive()`
-        # call (likely by another task using a broadcast receiver)
-        # doesn't accidentally pull the `return` message
-        # value out of the underlying feed mem chan which is
-        # destined for the `Context.result()` call during ctx-exit!
-        stream._eoc: Exception = eoc
-
-        # in case there already is some underlying remote error
-        # that arrived which is probably the source of this stream
-        # closure
-        ctx.maybe_raise()
-
-        raise eoc from src_err
-
-    if (
-        stream
-        and stream._closed
-    ):
-        raise trio.ClosedResourceError('This stream was closed')
-
-
-    # always re-raise the source error if no translation error case
-    # is activated above.
-    _type: str = 'Stream' if stream else 'Context'
-    raise MessagingError(
-        f"{_type} was expecting a '{expect_key}' message"
-        " BUT received a non-error msg:\n"
-        f'{pformat(msg)}'
-    ) from src_err

tractor/_ipc.py

@@ -19,41 +19,34 @@ 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,
 )
 
 from tricycle import BufferedReceiveStream
+import msgspec
 import trio
+from async_generator import asynccontextmanager
 
-from tractor.log import get_logger
-from tractor._exceptions import TransportClosed
-from tractor.msg import (
-    _ctxvar_MsgCodec,
-    MsgCodec,
-    mk_codec,
-)
-
+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:
@@ -119,28 +112,11 @@ class MsgpackTCPStream(MsgTransport):
     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
@@ -156,19 +132,15 @@ class MsgpackTCPStream(MsgTransport):
         # 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.codec: MsgCodec = codec or mk_codec()
+        # 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`.
+        '''Yield packets from the underlying stream.
 
         '''
         import msgspec  # noqa
@@ -204,23 +176,7 @@ class MsgpackTCPStream(MsgTransport):
 
             log.transport(f"received {msg_bytes}")  # type: ignore
             try:
-                # NOTE: lookup the `trio.Task.context`'s var for
-                # the current `MsgCodec`.
-                yield  _ctxvar_MsgCodec.get().decode(msg_bytes)
-
-                # TODO: remove, was only for orig draft impl
-                # testing.
-                #
-                # curr_codec: MsgCodec = _ctxvar_MsgCodec.get()
-                # obj = curr_codec.decode(msg_bytes)
-                # if (
-                #     curr_codec is not
-                #     _codec._def_msgspec_codec
-                # ):
-                #     print(f'OBJ: {obj}\n')
-                #
-                # yield obj
-
+                yield self.decode(msg_bytes)
             except (
                 msgspec.DecodeError,
                 UnicodeDecodeError,
@@ -243,23 +199,10 @@ class MsgpackTCPStream(MsgTransport):
                 else:
                     raise
 
-    async def send(
-        self,
-        msg: Any,
-
-        # hide_tb: bool = False,
-    ) -> None:
-        '''
-        Send a msgpack coded blob-as-msg over TCP.
-
-        '''
-        # __tracebackhide__: bool = hide_tb
+    async def send(self, msg: Any) -> None:
         async with self._send_lock:
 
-            # NOTE: lookup the `trio.Task.context`'s var for
-            # the current `MsgCodec`.
-            bytes_data: bytes = _ctxvar_MsgCodec.get().encode(msg)
-            # bytes_data: bytes = self.codec.encode(msg)
+            bytes_data: bytes = self.encode(msg)
 
             # supposedly the fastest says,
             # https://stackoverflow.com/a/54027962
@@ -324,7 +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'),
 
@@ -342,31 +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._agen = self._aiter_recv()
-        self._exc: Exception|None = None  # set if far end actor errors
+        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(
@@ -377,79 +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
-
-    # TODO: something simliar at the IPC-`Context`
-    # level so as to support 
-    @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
+        type_key = type_key or self._transport_key
+        self.msgstream = get_msg_transport(type_key)(stream)
+        return self.msgstream
 
     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,
@@ -468,42 +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
 
-    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
-        log.transport(
-            '=> send IPC msg:\n\n'
-            f'{pformat(payload)}\n'
-        )  # type: ignore
-        assert self._transport
-
-        await self._transport.send(
-            payload,
-            # hide_tb=hide_tb,
-        )
+        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()
 
         # try:
-        #     return await self._transport.recv()
+        #     return await self.msgstream.recv()
         # except trio.BrokenResourceError:
         #     if self._autorecon:
         #         await self._reconnect()
@@ -516,8 +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):
@@ -568,16 +440,16 @@ class Channel:
         Async iterate items from underlying stream.
 
         '''
-        assert self._transport
+        assert self.msgstream
         while True:
             try:
-                async for item in self._transport:
+                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._transport.send(sent)
+                    #     await self.msgstream.send(sent)
             except trio.BrokenResourceError:
 
                 # if not self._autorecon:
@@ -590,14 +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

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

@@ -15,46 +15,38 @@
 # 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,
+    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 NamespacePath
 from ._exceptions import (
     unpack_error,
     NoResult,
-)
-from ._context import (
-    Context,
-    open_context_from_portal,
+    ContextCancelled,
 )
 from ._streaming import (
+    Context,
     MsgStream,
 )
 
@@ -62,47 +54,34 @@ from ._streaming import (
 log = get_logger(__name__)
 
 
-# TODO: rename to `unwrap_result()` and use
-# `._raise_from_no_key_in_msg()` (after tweak to
-# accept a `chan: Channel` arg) in key block!
 def _unwrap_msg(
     msg: dict[str, Any],
-    channel: Channel,
-
-    hide_tb: bool = True,
+    channel: Channel
 
 ) -> Any:
-    '''
-    Unwrap a final result from a `{return: <Any>}` IPC msg.
-
-    '''
-    __tracebackhide__: bool = hide_tb
-
+    __tracebackhide__ = True
     try:
         return msg['return']
-    except KeyError as ke:
-
+    except KeyError:
         # internal error should never get here
-        assert msg.get('cid'), (
-            "Received internal error at portal?"
-        )
+        assert msg.get('cid'), "Received internal error at portal?"
+        raise unpack_error(msg, channel) from None
 
-        raise unpack_error(
-            msg,
-            channel
-        ) from ke
+
+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
@@ -112,34 +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
+        self.channel = channel
         # during the portal's lifetime
-        self._result_msg: dict|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: Context | None = None
+        self._expect_result: Optional[Context] = None
         self._streams: set[MsgStream] = set()
         self.actor = current_actor()
 
-    @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
-
     async def _submit_for_result(
         self,
         ns: str,
@@ -147,14 +114,14 @@ class Portal:
         **kwargs
     ) -> None:
 
-        assert self._expect_result is None, (
-            "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 = await self.actor.start_remote_task(
             self.channel,
-            nsf=NamespacePath(f'{ns}:{func}'),
-            kwargs=kwargs
+            ns,
+            func,
+            kwargs
         )
 
     async def _return_once(
@@ -164,7 +131,7 @@ class Portal:
     ) -> dict[str, Any]:
 
         assert ctx._remote_func_type == 'asyncfunc'  # single response
-        msg: dict = await ctx._recv_chan.receive()
+        msg = await ctx._recv_chan.receive()
         return msg
 
     async def result(self) -> Any:
@@ -195,10 +162,7 @@ class Portal:
                 self._expect_result
             )
 
-        return _unwrap_msg(
-            self._result_msg,
-            self.channel,
-        )
+        return _unwrap_msg(self._result_msg, self.channel)
 
     async def _cancel_streams(self):
         # terminate all locally running async generator
@@ -229,57 +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.
 
         '''
-        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'`Portal.cancel_actor()` => {self.channel.uid}\n'
-            f' |_{chan}\n'
-        )
         log.cancel(
-            f'Sending runtime `.cancel()` request to peer\n\n'
-            f'{reminfo}'
-        )
+            f"Sending actor cancel request to {self.channel.uid} on "
+            f"{self.channel}")
+
+        self.channel._cancel_called = True
 
-        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
@@ -288,11 +225,9 @@ 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
 
     async def run_from_ns(
@@ -311,33 +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.
 
         '''
-        nsf = NamespacePath(
-            f'{namespace_path}:{function_name}'
-        )
         ctx = await self.actor.start_remote_task(
-            chan=self.channel,
-            nsf=nsf,
-            kwargs=kwargs,
+            self.channel,
+            namespace_path,
+            function_name,
+            kwargs,
         )
         ctx._portal = self
         msg = await self._return_once(ctx)
-        return _unwrap_msg(
-            msg,
-            self.channel,
-        )
+        return _unwrap_msg(msg, self.channel)
 
     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
@@ -356,9 +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 (
@@ -371,12 +299,13 @@ 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,
+            fn_mod_path,
+            fn_name,
+            kwargs,
         )
         ctx._portal = self
         return _unwrap_msg(
@@ -384,7 +313,7 @@ class Portal:
             self.channel,
         )
 
-    @acm
+    @asynccontextmanager
     async def open_stream_from(
         self,
         async_gen_func: Callable,  # typing: ignore
@@ -400,10 +329,13 @@ 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,
+            fn_mod_path,
+            fn_name,
+            kwargs
         )
         ctx._portal = self
 
@@ -413,8 +345,7 @@ class Portal:
         try:
             # deliver receive only stream
             async with MsgStream(
-                ctx=ctx,
-                rx_chan=ctx._recv_chan,
+                ctx, ctx._recv_chan,
             ) as rchan:
                 self._streams.add(rchan)
                 yield rchan
@@ -441,12 +372,175 @@ class Portal:
             # await recv_chan.aclose()
             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
@@ -461,12 +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.
@@ -477,11 +566,11 @@ class LocalPortal:
         return await func(**kwargs)
 
 
-@acm
+@asynccontextmanager
 async def open_portal(
 
     channel: Channel,
-    nursery: trio.Nursery|None = None,
+    nursery: Optional[trio.Nursery] = None,
     start_msg_loop: bool = True,
     shield: bool = False,
 
@@ -506,7 +595,7 @@ 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 nursery.start(

tractor/_root.py

@@ -25,19 +25,19 @@ import logging
 import signal
 import sys
 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
@@ -46,14 +46,8 @@ 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')
@@ -64,54 +58,38 @@ 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,
 
     # 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,
-
-) -> Actor:
+) -> typing.Any:
     '''
     Runtime init entry point for ``tractor``.
 
     '''
-    # 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
-    if (
-        await _debug.maybe_init_greenback(
-            raise_not_found=False,
-        )
-    ):
-        builtin_bp_handler = sys.breakpointhook
-        orig_bp_path: str|None = os.environ.get(
-            'PYTHONBREAKPOINT',
-            None,
-        )
-        os.environ['PYTHONBREAKPOINT'] = (
-            'tractor.devx._debug.pause_from_sync'
-        )
+    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.
@@ -121,11 +99,7 @@ async def open_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(
@@ -141,34 +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.
@@ -186,146 +155,75 @@ async def open_root_actor(
             "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:
-        try:
-            logger.info('Enabling `stackscope` traces on SIGUSR1')
-            from .devx import enable_stack_on_sig
-            enable_stack_on_sig()
-        except ImportError:
-            logger.warning(
-                '`stackscope` not installed for use in debug mode!'
-            )
+    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.warning(f'No actor registry found @ {addr}')
-
-    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
                 )
             )
@@ -337,16 +235,12 @@ async def open_root_actor(
                 BaseExceptionGroup,
             ) as err:
 
-                entered: bool = await _debug._maybe_enter_pm(err)
+                entered = await _debug._maybe_enter_pm(err)
 
-                if (
-                    not entered
-                    and not is_multi_cancelled(err)
-                ):
-                    logger.exception('Root actor crashed:\n')
+                if not entered and not is_multi_cancelled(err):
+                    logger.exception("Root actor crashed:")
 
-                # ALWAYS re-raise any error bubbled up from the
-                # runtime!
+                # always re-raise
                 raise
 
             finally:
@@ -359,15 +253,12 @@ 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
+        # restore breakpoint hook state
         sys.breakpointhook = builtin_bp_handler
         if orig_bp_path is not None:
             os.environ['PYTHONBREAKPOINT'] = orig_bp_path
@@ -383,7 +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,
@@ -407,7 +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 (
@@ -31,28 +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,
 )
-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 .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')
@@ -69,6 +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:
@@ -143,7 +145,7 @@ async def exhaust_portal(
 
         # XXX: streams should never be reaped here since they should
         # always be established and shutdown using a context manager api
-        final: Any = await portal.result()
+        final = await portal.result()
 
     except (
         Exception,
@@ -151,23 +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
 
 
@@ -179,71 +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'|_{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
@@ -254,9 +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()
@@ -272,25 +231,15 @@ 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'|\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[
@@ -300,26 +249,14 @@ 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.cancel_actor()`\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:
         # if cancelled during a soft wait, cancel the child
         # actor before entering the hard reap sequence
@@ -331,29 +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
 
@@ -365,7 +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
 
@@ -377,7 +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
@@ -387,7 +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,
@@ -402,7 +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
     *,
@@ -445,22 +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:
             # TODO: needs ``trio_typing`` patch?
             proc = await trio.lowlevel.open_process(spawn_cmd)
-            log.runtime(
-                'Started new sub-proc\n'
-                f'|_{proc}\n'
-            )
+
+            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
@@ -491,11 +418,12 @@ async def trio_proc(
 
         # send additional init params
         await chan.send({
-            '_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,
+            "_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
@@ -521,7 +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
@@ -529,10 +457,9 @@ async def trio_proc(
 
             # cancel result waiter that may have been spawned in
             # tandem if not done already
-            log.cancel(
-                'Cancelling existing result waiter task for '
-                f'{subactor.uid}'
-            )
+            log.warning(
+                "Cancelling existing result waiter task for "
+                f"{subactor.uid}")
             nursery.cancel_scope.cancel()
 
     finally:
@@ -550,40 +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:
@@ -601,7 +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
     *,
@@ -659,7 +568,7 @@ async def mp_proc(
         target=_mp_main,
         args=(
             subactor,
-            bind_addrs,
+            bind_addr,
             fs_info,
             _spawn_method,
             parent_addr,
@@ -727,7 +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

@@ -18,88 +18,44 @@
 Per process state
 
 """
-from __future__ import annotations
 from typing import (
+    Optional,
     Any,
-    TYPE_CHECKING,
 )
 
-if TYPE_CHECKING:
-    from ._runtime import Actor
+import trio
+
+from ._exceptions import NoRuntime
 
 
-_current_actor: Actor|None = None  # type: ignore # noqa
-_last_actor_terminated: Actor|None = None
+_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': [],
+    '_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'
-        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'
-                'Did you forget to open one of:\n\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'])
 
 

tractor/_streaming.py

@@ -14,38 +14,31 @@
 # 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/>.
 
-'''
+"""
 Message stream types and APIs.
 
-The machinery and types behind ``Context.open_stream()``
-
-'''
+"""
 from __future__ import annotations
-from contextlib import asynccontextmanager as acm
 import inspect
-from pprint import pformat
+from contextlib import asynccontextmanager
+from dataclasses import dataclass
 from typing import (
     Any,
+    Optional,
     Callable,
-    AsyncIterator,
-    TYPE_CHECKING,
+    AsyncGenerator,
+    AsyncIterator
 )
+
 import warnings
 
 import trio
 
-from ._exceptions import (
-    _raise_from_no_key_in_msg,
-    ContextCancelled,
-)
+from ._ipc import Channel
+from ._exceptions import unpack_error, ContextCancelled
+from ._state import current_actor
 from .log import get_logger
-from .trionics import (
-    broadcast_receiver,
-    BroadcastReceiver,
-)
-
-if TYPE_CHECKING:
-    from ._context import Context
+from .trionics import broadcast_receiver, BroadcastReceiver
 
 
 log = get_logger(__name__)
@@ -56,6 +49,7 @@ log = get_logger(__name__)
 #   messages? class ReceiveChannel(AsyncResource, Generic[ReceiveType]):
 # - use __slots__ on ``Context``?
 
+
 class MsgStream(trio.abc.Channel):
     '''
     A bidirectional message stream for receiving logically sequenced
@@ -76,9 +70,9 @@ class MsgStream(trio.abc.Channel):
     '''
     def __init__(
         self,
-        ctx: Context,  # typing: ignore # noqa
+        ctx: 'Context',  # typing: ignore # noqa
         rx_chan: trio.MemoryReceiveChannel,
-        _broadcaster: BroadcastReceiver | None = None,
+        _broadcaster: Optional[BroadcastReceiver] = None,
 
     ) -> None:
         self._ctx = ctx
@@ -86,248 +80,122 @@ class MsgStream(trio.abc.Channel):
         self._broadcaster = _broadcaster
 
         # flag to denote end of stream
-        self._eoc: bool|trio.EndOfChannel = False
-        self._closed: bool|trio.ClosedResourceError = False
+        self._eoc: bool = False
+        self._closed: bool = False
 
     # delegate directly to underlying mem channel
-    def receive_nowait(
-        self,
-        allow_msg_keys: list[str] = ['yield'],
-    ):
-        msg: dict = self._rx_chan.receive_nowait()
-        for (
-            i,
-            key,
-        ) in enumerate(allow_msg_keys):
-            try:
-                return msg[key]
-            except KeyError as kerr:
-                if i < (len(allow_msg_keys) - 1):
-                    continue
+    def receive_nowait(self):
+        msg = self._rx_chan.receive_nowait()
+        return msg['yield']
 
-                _raise_from_no_key_in_msg(
-                    ctx=self._ctx,
-                    msg=msg,
-                    src_err=kerr,
-                    log=log,
-                    expect_key=key,
-                    stream=self,
-                )
-
-    async def receive(
-        self,
-
-        hide_tb: bool = True,
-    ):
-        '''
-        Receive a single msg from the IPC transport, the next in
-        sequence sent by the far end task (possibly in order as
-        determined by the underlying protocol).
+    async def receive(self):
+        '''Async receive a single msg from the IPC transport, the next
+        in sequence for this stream.
 
         '''
-        __tracebackhide__: bool = hide_tb
-
-        # NOTE: `trio.ReceiveChannel` implements
-        # EOC handling as follows (aka uses it
-        # to gracefully exit async for loops):
-        #
-        # async def __anext__(self) -> ReceiveType:
-        #     try:
-        #         return await self.receive()
-        #     except trio.EndOfChannel:
-        #         raise StopAsyncIteration
-        #
         # see ``.aclose()`` for notes on the old behaviour prior to
         # introducing this
         if self._eoc:
-            raise self._eoc
+            raise trio.EndOfChannel
 
         if self._closed:
-            raise self._closed
+            raise trio.ClosedResourceError('This stream was closed')
 
-        src_err: Exception|None = None  # orig tb
         try:
-            try:
-                msg = await self._rx_chan.receive()
-                return msg['yield']
+            msg = await self._rx_chan.receive()
+            return msg['yield']
 
-            except KeyError as kerr:
-                src_err = kerr
+        except KeyError as err:
+            # internal error should never get here
+            assert msg.get('cid'), ("Received internal error at portal?")
 
-                # NOTE: may raise any of the below error types
-                # includg EoC when a 'stop' msg is found.
-                _raise_from_no_key_in_msg(
-                    ctx=self._ctx,
-                    msg=msg,
-                    src_err=kerr,
-                    log=log,
-                    expect_key='yield',
-                    stream=self,
-                )
+            # TODO: handle 2 cases with 3.10 match syntax
+            # - 'stop'
+            # - 'error'
+            # possibly just handle msg['stop'] here!
+
+            if self._closed:
+                raise trio.ClosedResourceError('This stream was closed')
+
+            if msg.get('stop') or self._eoc:
+                log.debug(f"{self} was stopped at remote end")
+
+                # XXX: important to set so that a new ``.receive()``
+                # call (likely by another task using a broadcast receiver)
+                # doesn't accidentally pull the ``return`` message
+                # value out of the underlying feed mem chan!
+                self._eoc = True
+
+                # # when the send is closed we assume the stream has
+                # # terminated and signal this local iterator to stop
+                # await self.aclose()
+
+                # XXX: this causes ``ReceiveChannel.__anext__()`` to
+                # raise a ``StopAsyncIteration`` **and** in our catch
+                # block below it will trigger ``.aclose()``.
+                raise trio.EndOfChannel from err
+
+            # TODO: test that shows stream raising an expected error!!!
+            elif msg.get('error'):
+                # raise the error message
+                raise unpack_error(msg, self._ctx.chan)
+
+            else:
+                raise
 
-        # XXX: the stream terminates on either of:
-        # - via `self._rx_chan.receive()` raising  after manual closure
-        #   by the rpc-runtime OR,
-        # - via a received `{'stop': ...}` msg from remote side.
-        #   |_ NOTE: previously this was triggered by calling
-        #   ``._rx_chan.aclose()`` on the send side of the channel inside
-        #   `Actor._push_result()`, but now the 'stop' message handling
-        #   has been put just above inside `_raise_from_no_key_in_msg()`.
         except (
-            trio.EndOfChannel,
-        ) as eoc:
-            src_err = eoc
-            self._eoc = eoc
+            trio.ClosedResourceError,  # by self._rx_chan
+            trio.EndOfChannel,  # by self._rx_chan or `stop` msg from far end
+        ):
+            # XXX: we close the stream on any of these error conditions:
+
+            # a ``ClosedResourceError`` indicates that the internal
+            # feeder memory receive channel was closed likely by the
+            # runtime after the associated transport-channel
+            # disconnected or broke.
+
+            # an ``EndOfChannel`` indicates either the internal recv
+            # memchan exhausted **or** we raisesd it just above after
+            # receiving a `stop` message from the far end of the stream.
+
+            # Previously this was triggered by calling ``.aclose()`` on
+            # the send side of the channel inside
+            # ``Actor._push_result()`` (should still be commented code
+            # there - which should eventually get removed), but now the
+            # 'stop' message handling has been put just above.
 
             # TODO: Locally, we want to close this stream gracefully, by
             # terminating any local consumers tasks deterministically.
-            # Once we have broadcast support, we **don't** want to be
+            # One we have broadcast support, we **don't** want to be
             # closing this stream and not flushing a final value to
             # remaining (clone) consumers who may not have been
             # scheduled to receive it yet.
-            # try:
-            #     maybe_err_msg_or_res: dict = self._rx_chan.receive_nowait()
-            #     if maybe_err_msg_or_res:
-            #         log.warning(
-            #             'Discarding un-processed msg:\n'
-            #             f'{maybe_err_msg_or_res}'
-            #         )
-            # except trio.WouldBlock:
-            #     # no queued msgs that might be another remote
-            #     # error, so just raise the original EoC
-            #     pass
 
-            # raise eoc
+            # when the send is closed we assume the stream has
+            # terminated and signal this local iterator to stop
+            await self.aclose()
 
-        # a ``ClosedResourceError`` indicates that the internal
-        # feeder memory receive channel was closed likely by the
-        # runtime after the associated transport-channel
-        # disconnected or broke.
-        except trio.ClosedResourceError as cre:  # by self._rx_chan.receive()
-            src_err = cre
-            log.warning(
-                '`Context._rx_chan` was already closed?'
-            )
-            self._closed = cre
+            raise  # propagate
 
-        # when the send is closed we assume the stream has
-        # terminated and signal this local iterator to stop
-        drained: list[Exception|dict] = await self.aclose()
-        if drained:
-            # from .devx import pause
-            # await pause()
-            log.warning(
-                'Drained context msgs during closure:\n'
-                f'{drained}'
-            )
-        # TODO: pass these to the `._ctx._drained_msgs: deque`
-        # and then iterate them as part of any `.result()` call?
-
-        # NOTE XXX: if the context was cancelled or remote-errored
-        # but we received the stream close msg first, we
-        # probably want to instead raise the remote error
-        # over the end-of-stream connection error since likely
-        # the remote error was the source cause?
-        ctx: Context = self._ctx
-        ctx.maybe_raise(
-            raise_ctxc_from_self_call=True,
-        )
-
-        # propagate any error but hide low-level frame details
-        # from the caller by default for debug noise reduction.
-        if (
-            hide_tb
-
-            # XXX NOTE XXX don't reraise on certain
-            # stream-specific internal error types like,
-            #
-            # - `trio.EoC` since we want to use the exact instance
-            #   to ensure that it is the error that bubbles upward
-            #   for silent absorption by `Context.open_stream()`.
-            and not self._eoc
-
-            # - `RemoteActorError` (or `ContextCancelled`) if it gets
-            #   raised from `_raise_from_no_key_in_msg()` since we
-            #   want the same (as the above bullet) for any
-            #   `.open_context()` block bubbled error raised by
-            #   any nearby ctx API remote-failures.
-            # and not isinstance(src_err, RemoteActorError)
-        ):
-            raise type(src_err)(*src_err.args) from src_err
-        else:
-            raise src_err
-
-    async def aclose(self) -> list[Exception|dict]:
+    async def aclose(self):
         '''
         Cancel associated remote actor task and local memory channel on
         close.
 
-        Notes: 
-         - REMEMBER that this is also called by `.__aexit__()` so
-           careful consideration must be made to handle whatever
-           internal stsate is mutated, particuarly in terms of
-           draining IPC msgs!
-
-         - more or less we try to maintain adherance to trio's `.aclose()` semantics:
-           https://trio.readthedocs.io/en/stable/reference-io.html#trio.abc.AsyncResource.aclose
         '''
+        # XXX: keep proper adherance to trio's `.aclose()` semantics:
+        # https://trio.readthedocs.io/en/stable/reference-io.html#trio.abc.AsyncResource.aclose
+        rx_chan = self._rx_chan
 
-        # rx_chan = self._rx_chan
+        if rx_chan._closed:
+            log.cancel(f"{self} is already closed")
 
-        # XXX NOTE XXX
-        # it's SUPER IMPORTANT that we ensure we don't DOUBLE
-        # DRAIN msgs on closure so avoid getting stuck handing on
-        # the `._rx_chan` since we call this method on
-        # `.__aexit__()` as well!!!
-        # => SO ENSURE WE CATCH ALL TERMINATION STATES in this
-        # block including the EoC..
-        if self.closed:
             # this stream has already been closed so silently succeed as
             # per ``trio.AsyncResource`` semantics.
             # https://trio.readthedocs.io/en/stable/reference-io.html#trio.abc.AsyncResource.aclose
-            return []
+            return
 
-        ctx: Context = self._ctx
-        drained: list[Exception|dict] = []
-        while not drained:
-            try:
-                maybe_final_msg = self.receive_nowait(
-                    allow_msg_keys=['yield', 'return'],
-                )
-                if maybe_final_msg:
-                    log.debug(
-                        'Drained un-processed stream msg:\n'
-                        f'{pformat(maybe_final_msg)}'
-                    )
-                    # TODO: inject into parent `Context` buf?
-                    drained.append(maybe_final_msg)
-
-            # NOTE: we only need these handlers due to the
-            # `.receive_nowait()` call above which may re-raise
-            # one of these errors on a msg key error!
-
-            except trio.WouldBlock as be:
-                drained.append(be)
-                break
-
-            except trio.EndOfChannel as eoc:
-                self._eoc: Exception = eoc
-                drained.append(eoc)
-                break
-
-            except trio.ClosedResourceError as cre:
-                self._closed = cre
-                drained.append(cre)
-                break
-
-            except ContextCancelled as ctxc:
-                # log.exception('GOT CTXC')
-                log.cancel(
-                    'Context was cancelled during stream closure:\n'
-                    f'canceller: {ctxc.canceller}\n'
-                    f'{pformat(ctxc.msgdata)}'
-                )
-                break
+        self._eoc = True
 
         # NOTE: this is super subtle IPC messaging stuff:
         # Relay stop iteration to far end **iff** we're
@@ -358,40 +226,26 @@ class MsgStream(trio.abc.Channel):
         except (
             trio.BrokenResourceError,
             trio.ClosedResourceError
-        ) as re:
+        ):
             # the underlying channel may already have been pulled
             # in which case our stop message is meaningless since
             # it can't traverse the transport.
+            ctx = self._ctx
             log.warning(
                 f'Stream was already destroyed?\n'
                 f'actor: {ctx.chan.uid}\n'
                 f'ctx id: {ctx.cid}'
             )
-            drained.append(re)
-            self._closed = re
 
-        # if caught_eoc:
-        #     # from .devx import _debug
-        #     # await _debug.pause()
-        #     with trio.CancelScope(shield=True):
-        #         await rx_chan.aclose()
+        self._closed = True
 
-        if not self._eoc:
-            log.cancel(
-                'Stream closed before it received an EoC?\n'
-                'Setting eoc manually..\n..'
-            )
-            self._eoc: bool = trio.EndOfChannel(
-                f'Context stream closed by {self._ctx.side}\n'
-                f'|_{self}\n'
-            )
-        # ?XXX WAIT, why do we not close the local mem chan `._rx_chan` XXX?
-        # => NO, DEFINITELY NOT! <=
-        # if we're a bi-dir ``MsgStream`` BECAUSE this same
-        # core-msg-loop mem recv-chan is used to deliver the
-        # potential final result from the surrounding inter-actor
-        # `Context` so we don't want to close it until that
-        # context has run to completion.
+        # Do we close the local mem chan ``self._rx_chan`` ??!?
+
+        # NO, DEFINITELY NOT if we're a bi-dir ``MsgStream``!
+        # BECAUSE this same core-msg-loop mem recv-chan is used to deliver
+        # the potential final result from the surrounding inter-actor
+        # `Context` so we don't want to close it until that context has
+        # run to completion.
 
         # XXX: Notes on old behaviour:
         # await rx_chan.aclose()
@@ -420,28 +274,8 @@ class MsgStream(trio.abc.Channel):
         # runtime's closure of ``rx_chan`` in the case where we may
         # still need to consume msgs that are "in transit" from the far
         # end (eg. for ``Context.result()``).
-        # self._closed = True
-        return drained
 
-    @property
-    def closed(self) -> bool:
-
-        rxc: bool = self._rx_chan._closed
-        _closed: bool|Exception = self._closed
-        _eoc: bool|trio.EndOfChannel = self._eoc
-        if rxc or _closed or _eoc:
-            log.runtime(
-                f'`MsgStream` is already closed\n'
-                f'{self}\n'
-                f' |_cid: {self._ctx.cid}\n'
-                f' |_rx_chan._closed: {type(rxc)} = {rxc}\n'
-                f' |_closed: {type(_closed)} = {_closed}\n'
-                f' |_eoc: {type(_eoc)} = {_eoc}'
-            )
-            return True
-        return False
-
-    @acm
+    @asynccontextmanager
     async def subscribe(
         self,
 
@@ -495,61 +329,386 @@ class MsgStream(trio.abc.Channel):
 
     async def send(
         self,
-        data: Any,
-
-        hide_tb: bool = True,
+        data: Any
     ) -> None:
         '''
         Send a message over this stream to the far end.
 
         '''
-        __tracebackhide__: bool = hide_tb
-
-        # raise any alreay known error immediately
-        self._ctx.maybe_raise()
-        if self._eoc:
-            raise self._eoc
+        if self._ctx._error:
+            raise self._ctx._error  # from None
 
         if self._closed:
-            raise self._closed
+            raise trio.ClosedResourceError('This stream was already closed')
 
-        try:
-            await self._ctx.chan.send(
-                payload={
-                    'yield': data,
-                    'cid': self._ctx.cid,
-                },
-                # hide_tb=hide_tb,
+        await self._ctx.chan.send({'yield': data, 'cid': self._ctx.cid})
+
+
+@dataclass
+class Context:
+    '''
+    An inter-actor, ``trio`` task communication context.
+
+    NB: This class should never be instatiated directly, it is delivered
+    by either runtime machinery to a remotely started task or by entering
+    ``Portal.open_context()``.
+
+    Allows maintaining task or protocol specific state between
+    2 communicating actor tasks. A unique context is created on the
+    callee side/end for every request to a remote actor from a portal.
+
+    A context can be cancelled and (possibly eventually restarted) from
+    either side of the underlying IPC channel, open task oriented
+    message streams and acts as an IPC aware inter-actor-task cancel
+    scope.
+
+    '''
+    chan: Channel
+    cid: str
+
+    # these are the "feeder" channels for delivering
+    # message values to the local task from the runtime
+    # msg processing loop.
+    _recv_chan: trio.MemoryReceiveChannel
+    _send_chan: trio.MemorySendChannel
+
+    _remote_func_type: Optional[str] = None
+
+    # only set on the caller side
+    _portal: Optional['Portal'] = None    # type: ignore # noqa
+    _result: Optional[Any] = False
+    _error: Optional[BaseException] = None
+
+    # status flags
+    _cancel_called: bool = False
+    _cancel_msg: Optional[str] = None
+    _enter_debugger_on_cancel: bool = True
+    _started_called: bool = False
+    _started_received: bool = False
+    _stream_opened: bool = False
+
+    # only set on the callee side
+    _scope_nursery: Optional[trio.Nursery] = None
+
+    _backpressure: bool = False
+
+    async def send_yield(self, data: Any) -> None:
+
+        warnings.warn(
+            "`Context.send_yield()` is now deprecated. "
+            "Use ``MessageStream.send()``. ",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        await self.chan.send({'yield': data, 'cid': self.cid})
+
+    async def send_stop(self) -> None:
+        await self.chan.send({'stop': True, 'cid': self.cid})
+
+    async def _maybe_raise_from_remote_msg(
+        self,
+        msg: dict[str, Any],
+
+    ) -> None:
+        '''
+        (Maybe) unpack and raise a msg error into the local scope
+        nursery for this context.
+
+        Acts as a form of "relay" for a remote error raised
+        in the corresponding remote callee task.
+
+        '''
+        error = msg.get('error')
+        if error:
+            # If this is an error message from a context opened by
+            # ``Portal.open_context()`` we want to interrupt any ongoing
+            # (child) tasks within that context to be notified of the remote
+            # error relayed here.
+            #
+            # The reason we may want to raise the remote error immediately
+            # is that there is no guarantee the associated local task(s)
+            # will attempt to read from any locally opened stream any time
+            # soon.
+            #
+            # NOTE: this only applies when
+            # ``Portal.open_context()`` has been called since it is assumed
+            # (currently) that other portal APIs (``Portal.run()``,
+            # ``.run_in_actor()``) do their own error checking at the point
+            # of the call and result processing.
+            log.error(
+                f'Remote context error for {self.chan.uid}:{self.cid}:\n'
+                f'{msg["error"]["tb_str"]}'
             )
-        except (
-            trio.ClosedResourceError,
-            trio.BrokenResourceError,
-            BrokenPipeError,
-        ) as trans_err:
-            if hide_tb:
-                raise type(trans_err)(
-                    *trans_err.args
-                ) from trans_err
-            else:
-                raise
+            error = unpack_error(msg, self.chan)
+            if (
+                isinstance(error, ContextCancelled) and
+                self._cancel_called
+            ):
+                # this is an expected cancel request response message
+                # and we don't need to raise it in scope since it will
+                # potentially override a real error
+                return
 
-    # TODO: msg capability context api1
-    # @acm
-    # async def enable_msg_caps(
-    #     self,
-    #     msg_subtypes: Union[
-    #         list[list[Struct]],
-    #         Protocol,   # hypothetical type that wraps a msg set
-    #     ],
-    # ) -> tuple[Callable, Callable]:  # payload enc, dec pair
-    #     ...
+            self._error = error
+
+            # TODO: tempted to **not** do this by-reraising in a
+            # nursery and instead cancel a surrounding scope, detect
+            # the cancellation, then lookup the error that was set?
+            if self._scope_nursery:
+
+                async def raiser():
+                    raise self._error from None
+
+                # from trio.testing import wait_all_tasks_blocked
+                # await wait_all_tasks_blocked()
+                if not self._scope_nursery._closed:  # type: ignore
+                    self._scope_nursery.start_soon(raiser)
+
+    async def cancel(
+        self,
+        msg: Optional[str] = None,
+
+    ) -> None:
+        '''
+        Cancel this inter-actor-task context.
+
+        Request that the far side cancel it's current linked context,
+        Timeout quickly in an attempt to sidestep 2-generals...
+
+        '''
+        side = 'caller' if self._portal else 'callee'
+        if msg:
+            assert side == 'callee', 'Only callee side can provide cancel msg'
+
+        log.cancel(f'Cancelling {side} side of context to {self.chan.uid}')
+
+        self._cancel_called = True
+
+        if side == 'caller':
+            if not self._portal:
+                raise RuntimeError(
+                    "No portal found, this is likely a callee side context"
+                )
+
+            cid = self.cid
+            with trio.move_on_after(0.5) as cs:
+                cs.shield = True
+                log.cancel(
+                    f"Cancelling stream {cid} to "
+                    f"{self._portal.channel.uid}")
+
+                # NOTE: we're telling the far end actor to cancel a task
+                # corresponding to *this actor*. The far end local channel
+                # instance is passed to `Actor._cancel_task()` implicitly.
+                await self._portal.run_from_ns('self', '_cancel_task', cid=cid)
+
+            if cs.cancelled_caught:
+                # XXX: there's no way to know if the remote task was indeed
+                # cancelled in the case where the connection is broken or
+                # some other network error occurred.
+                # if not self._portal.channel.connected():
+                if not self.chan.connected():
+                    log.cancel(
+                        "May have failed to cancel remote task "
+                        f"{cid} for {self._portal.channel.uid}")
+                else:
+                    log.cancel(
+                        "Timed out on cancelling remote task "
+                        f"{cid} for {self._portal.channel.uid}")
+
+        # callee side remote task
+        else:
+            self._cancel_msg = msg
+
+            # TODO: should we have an explicit cancel message
+            # or is relaying the local `trio.Cancelled` as an
+            # {'error': trio.Cancelled, cid: "blah"} enough?
+            # This probably gets into the discussion in
+            # https://github.com/goodboy/tractor/issues/36
+            assert self._scope_nursery
+            self._scope_nursery.cancel_scope.cancel()
+
+        if self._recv_chan:
+            await self._recv_chan.aclose()
+
+    @asynccontextmanager
+    async def open_stream(
+
+        self,
+        backpressure: Optional[bool] = True,
+        msg_buffer_size: Optional[int] = None,
+
+    ) -> AsyncGenerator[MsgStream, None]:
+        '''
+        Open a ``MsgStream``, a bi-directional stream connected to the
+        cross-actor (far end) task for this ``Context``.
+
+        This context manager must be entered on both the caller and
+        callee for the stream to logically be considered "connected".
+
+        A ``MsgStream`` is currently "one-shot" use, meaning if you
+        close it you can not "re-open" it for streaming and instead you
+        must re-establish a new surrounding ``Context`` using
+        ``Portal.open_context()``.  In the future this may change but
+        currently there seems to be no obvious reason to support
+        "re-opening":
+            - pausing a stream can be done with a message.
+            - task errors will normally require a restart of the entire
+              scope of the inter-actor task context due to the nature of
+              ``trio``'s cancellation system.
+
+        '''
+        actor = current_actor()
+
+        # here we create a mem chan that corresponds to the
+        # far end caller / callee.
+
+        # Likewise if the surrounding context has been cancelled we error here
+        # since it likely means the surrounding block was exited or
+        # killed
+
+        if self._cancel_called:
+            task = trio.lowlevel.current_task().name
+            raise ContextCancelled(
+                f'Context around {actor.uid[0]}:{task} was already cancelled!'
+            )
+
+        if not self._portal and not self._started_called:
+            raise RuntimeError(
+                'Context.started()` must be called before opening a stream'
+            )
+
+        # NOTE: in one way streaming this only happens on the
+        # caller side inside `Actor.start_remote_task()` so if you try
+        # to send a stop from the caller to the callee in the
+        # single-direction-stream case you'll get a lookup error
+        # currently.
+        ctx = actor.get_context(
+            self.chan,
+            self.cid,
+            msg_buffer_size=msg_buffer_size,
+        )
+        ctx._backpressure = backpressure
+        assert ctx is self
+
+        # XXX: If the underlying channel feeder receive mem chan has
+        # been closed then likely client code has already exited
+        # a ``.open_stream()`` block prior or there was some other
+        # unanticipated error or cancellation from ``trio``.
+
+        if ctx._recv_chan._closed:
+            raise trio.ClosedResourceError(
+                'The underlying channel for this stream was already closed!?')
+
+        async with MsgStream(
+            ctx=self,
+            rx_chan=ctx._recv_chan,
+        ) as stream:
+
+            if self._portal:
+                self._portal._streams.add(stream)
+
+            try:
+                self._stream_opened = True
+
+                # XXX: do we need this?
+                # ensure we aren't cancelled before yielding the stream
+                # await trio.lowlevel.checkpoint()
+                yield stream
+
+                # NOTE: Make the stream "one-shot use".  On exit, signal
+                # ``trio.EndOfChannel``/``StopAsyncIteration`` to the
+                # far end.
+                await stream.aclose()
+
+            finally:
+                if self._portal:
+                    try:
+                        self._portal._streams.remove(stream)
+                    except KeyError:
+                        log.warning(
+                            f'Stream was already destroyed?\n'
+                            f'actor: {self.chan.uid}\n'
+                            f'ctx id: {self.cid}'
+                        )
+
+    async def result(self) -> Any:
+        '''
+        From a caller side, wait for and return the final result from
+        the callee side task.
+
+        '''
+        assert self._portal, "Context.result() can not be called from callee!"
+        assert self._recv_chan
+
+        if self._result is False:
+
+            if not self._recv_chan._closed:  # type: ignore
+
+                # wait for a final context result consuming
+                # and discarding any bi dir stream msgs still
+                # in transit from the far end.
+                while True:
+
+                    msg = await self._recv_chan.receive()
+                    try:
+                        self._result = msg['return']
+                        break
+                    except KeyError as msgerr:
+
+                        if 'yield' in msg:
+                            # far end task is still streaming to us so discard
+                            log.warning(f'Discarding stream delivered {msg}')
+                            continue
+
+                        elif 'stop' in msg:
+                            log.debug('Remote stream terminated')
+                            continue
+
+                        # internal error should never get here
+                        assert msg.get('cid'), (
+                            "Received internal error at portal?")
+
+                        raise unpack_error(
+                            msg, self._portal.channel
+                        ) from msgerr
+
+        return self._result
+
+    async def started(
+        self,
+        value: Optional[Any] = None
+
+    ) -> None:
+        '''
+        Indicate to calling actor's task that this linked context
+        has started and send ``value`` to the other side.
+
+        On the calling side ``value`` is the second item delivered
+        in the tuple returned by ``Portal.open_context()``.
+
+        '''
+        if self._portal:
+            raise RuntimeError(
+                f"Caller side context {self} can not call started!")
+
+        elif self._started_called:
+            raise RuntimeError(
+                f"called 'started' twice on context with {self.chan.uid}")
+
+        await self.chan.send({'started': value, 'cid': self.cid})
+        self._started_called = True
+
+    # TODO: do we need a restart api?
+    # async def restart(self) -> None:
+    #     pass
 
 
 def stream(func: Callable) -> Callable:
-    '''
-    Mark an async function as a streaming routine with ``@stream``.
+    """Mark an async function as a streaming routine with ``@stream``.
 
-    '''
+    """
+    # annotate
     # TODO: apply whatever solution ``mypy`` ends up picking for this:
     # https://github.com/python/mypy/issues/2087#issuecomment-769266912
     func._tractor_stream_function = True  # type: ignore
@@ -575,3 +734,22 @@ def stream(func: Callable) -> Callable:
             "(Or ``to_trio`` if using ``asyncio`` in guest mode)."
         )
     return func
+
+
+def context(func: Callable) -> Callable:
+    """Mark an async function as a streaming routine with ``@context``.
+
+    """
+    # annotate
+    # TODO: apply whatever solution ``mypy`` ends up picking for this:
+    # https://github.com/python/mypy/issues/2087#issuecomment-769266912
+    func._tractor_context_function = True  # type: ignore
+
+    sig = inspect.signature(func)
+    params = sig.parameters
+    if 'ctx' not in params:
+        raise TypeError(
+            "The first argument to the context function "
+            f"{func.__name__} must be `ctx: tractor.Context`"
+        )
+    return func

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
@@ -94,7 +94,7 @@ class ActorNursery:
             tuple[
                 Actor,
                 trio.Process | mp.Process,
-                Portal | None,
+                Optional[Portal],
             ]
         ] = {}
         # portals spawned with ``run_in_actor()`` are
@@ -106,24 +106,16 @@ class ActorNursery:
         self.errors = errors
         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
-
     async def start_actor(
         self,
         name: str,
         *,
-        bind_addrs: list[tuple[str, int]] = [_default_bind_addr],
+        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: bool | None = None,
+        debug_mode: Optional[bool] | None = None,
         infect_asyncio: bool = False,
     ) -> Portal:
         '''
@@ -158,16 +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
@@ -177,7 +167,7 @@ class ActorNursery:
                 self,
                 subactor,
                 self.errors,
-                bind_addrs,
+                bind_addr,
                 parent_addr,
                 _rtv,  # run time vars
                 infect_asyncio=infect_asyncio,
@@ -190,8 +180,8 @@ class ActorNursery:
         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
@@ -200,16 +190,14 @@ 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.
-
-        '''
-        mod_path: str = fn.__module__
+        """
+        mod_path = fn.__module__
 
         if name is None:
             # use the explicit function name if not provided
@@ -220,7 +208,7 @@ class ActorNursery:
             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,
@@ -244,37 +232,21 @@ class ActorNursery:
         )
         return portal
 
-    async def cancel(
-        self,
-        hard_kill: bool = False,
-
-    ) -> None:
-        '''
-        Cancel this nursery by instructing each subactor to cancel
+    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.
 
         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
@@ -286,13 +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
@@ -309,24 +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()
 
@@ -366,7 +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,
@@ -375,16 +336,16 @@ 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:
                     errors[actor.uid] = inner_err
@@ -396,60 +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
 
@@ -470,22 +408,18 @@ async def _open_and_supervise_one_cancels_all_nursery(
             # 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'{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
@@ -494,9 +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:
@@ -531,20 +465,19 @@ async def open_nursery(
     which cancellation scopes correspond to each spawned subactor set.
 
     '''
-    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()
@@ -552,42 +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:
-        msg: str = (
-            'Actor-nursery exited\n'
-            f'|_{an}\n'
-        )
+        log.debug("Nursery teardown complete")
 
         # shutdown runtime if it was started
         if implicit_runtime:
-            msg += '=> Shutting down actor runtime <=\n'
-
-        log.info(msg)
+            log.info("Shutting down actor tree")

tractor/_testing/__init__.py

@@ -1,74 +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
-)
-
-
-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'
-
-
-@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/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

@@ -1,37 +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,
-    shield_sigint_handler as shield_sigint_handler,
-    MultiActorPdb as MultiActorPdb,
-    open_crash_handler as open_crash_handler,
-    maybe_open_crash_handler as maybe_open_crash_handler,
-    post_mortem as post_mortem,
-)
-from ._stackscope import (
-    enable_stack_on_sig as enable_stack_on_sig,
-)

tractor/devx/_stackscope.py

@@ -1,84 +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 signal import (
-    signal,
-    SIGUSR1,
-)
-
-import trio
-
-@trio.lowlevel.disable_ki_protection
-def dump_task_tree() -> None:
-    import stackscope
-    from tractor.log import get_console_log
-
-    tree_str: str = str(
-        stackscope.extract(
-            trio.lowlevel.current_root_task(),
-            recurse_child_tasks=True
-        )
-    )
-    log = get_console_log('cancel')
-    log.pdb(
-        f'Dumping `stackscope` tree:\n\n'
-        f'{tree_str}\n'
-    )
-    # 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")
-
-
-def signal_handler(sig: int, frame: object) -> None:
-    import traceback
-    try:
-        trio.lowlevel.current_trio_token(
-        ).run_sync_soon(dump_task_tree)
-    except RuntimeError:
-        # not in async context -- print a normal traceback
-        traceback.print_stack()
-
-
-
-def enable_stack_on_sig(
-    sig: int = SIGUSR1
-) -> None:
-    '''
-    Enable `stackscope` tracing on reception of a signal; by
-    default this is SIGUSR1.
-
-    '''
-    signal(
-        sig,
-        signal_handler,
-    )
-    # NOTE: not the above can be triggered from
-    # a (xonsh) shell using:
-    # kill -SIGUSR1 @$(pgrep -f '<cmd>')

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/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

@@ -48,15 +48,12 @@ LOG_FORMAT = (
 
 DATE_FORMAT = '%b %d %H:%M:%S'
 
-LEVELS: dict[str, int] = {
+LEVELS = {
     'TRANSPORT': 5,
     'RUNTIME': 15,
     'CANCEL': 16,
     'PDB': 500,
 }
-# _custom_levels: set[str] = {
-#     lvlname.lower for lvlname in LEVELS.keys()
-# }
 
 STD_PALETTE = {
     'CRITICAL': 'red',
@@ -85,10 +82,6 @@ class StackLevelAdapter(logging.LoggerAdapter):
         msg: str,
 
     ) -> None:
-        '''
-        IPC level msg-ing.
-
-        '''
         return self.log(5, msg)
 
     def runtime(
@@ -101,57 +94,22 @@ class StackLevelAdapter(logging.LoggerAdapter):
         self,
         msg: str,
     ) -> None:
-        '''
-        Cancellation logging, mostly for runtime reporting.
-
-        '''
-        return self.log(
-            level=16,
-            msg=msg,
-            # stacklevel=4,
-        )
+        return self.log(16, msg)
 
     def pdb(
         self,
         msg: str,
     ) -> None:
-        '''
-        Debugger logging.
-
-        '''
         return self.log(500, 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.
-
-        '''
+        """
         if self.isEnabledFor(level):
-            stacklevel: int = 3
-            if (
-                level in LEVELS.values()
-                # or level in _custom_levels
-            ):
-                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(
@@ -164,15 +122,12 @@ class StackLevelAdapter(logging.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,
@@ -226,39 +181,15 @@ def get_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
@@ -289,19 +220,11 @@ 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 = logging.StreamHandler()
         formatter = colorlog.ColoredFormatter(
@@ -319,7 +242,3 @@ def get_console_log(
 
 def get_loglevel() -> str:
     return _default_loglevel
-
-
-# global module logger for tractor itself
-log = get_logger('tractor')

tractor/msg.py

@@ -15,7 +15,7 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 '''
-IPC-compat cross-mem-boundary object pointer.
+Built-in messaging patterns, types, APIs and helpers.
 
 '''
 
@@ -43,92 +43,38 @@ IPC-compat cross-mem-boundary object pointer.
 # - 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.
+    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 | type | None = None
+    _ref: object = 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:
+    def load_ref(self) -> object:
         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.
+    def to_tuple(
+        self,
 
-        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__')
-
-        elif ismethod(ref):
-            # build out the path manually i guess..?
-            # TODO: better way?
-            name: str = '.'.join([
-                type(ref.__self__).__name__,
-                ref.__func__.__name__,
-            ])
-
-        else:  # object or other?
-            # isinstance(ref, object)
-            # and not isfunction(ref)
-            name: str = type(ref).__name__
-
-        # fully qualified namespace path, tuple.
-        fqnp: tuple[str, str] = (
-            ref.__module__,
-            name,
-        )
-        return fqnp
+    ) -> tuple[str, str]:
+        ref = self.load_ref()
+        return ref.__module__, getattr(ref, '__name__', '')
 
     @classmethod
     def from_ref(
         cls,
-        ref: type | object,
+        ref,
 
     ) -> 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()
-        )
+        return cls(':'.join(
+            (ref.__module__,
+             getattr(ref, '__name__', ''))
+        ))

tractor/msg/__init__.py

@@ -1,55 +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 .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,
-    current_codec as current_codec,
-)
-
-from .types import (
-    Msg as Msg,
-
-    Aid as Aid,
-    SpawnSpec as SpawnSpec,
-
-    Start as Start,
-    StartAck as StartAck,
-
-    Started as Started,
-    Yield as Yield,
-    Stop as Stop,
-    Return as Return,
-
-    Error as Error,
-
-    # full msg spec set
-    __spec__ as __spec__,
-)

tractor/msg/_codec.py

@@ -1,518 +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,
-# )
-from typing import (
-    Any,
-    Callable,
-    Type,
-    Union,
-)
-from types import ModuleType
-
-import msgspec
-from msgspec import msgpack
-from trio.lowlevel import (
-    RunVar,
-    RunVarToken,
-)
-# 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,
-    Msg,
-)
-
-
-# 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: Union[Type[Struct]]|None
-
-    # struct type unions
-    # https://jcristharif.com/msgspec/structs.html#tagged-unions
-    @property
-    def msg_spec(self) -> Union[Type[Struct]]:
-        return self._dec.type
-
-    lib: ModuleType = msgspec
-
-    # TODO: a sub-decoder system as well?
-    # payload_msg_specs: Union[Type[Struct]] = Any
-    # see related comments in `.msg.types`
-    # _payload_decs: (
-    #     dict[
-    #         str,
-    #         msgpack.Decoder,
-    #     ]
-    #     |None
-    # ) = None
-    # OR
-    # ) = {
-    #     # pre-seed decoders for std-py-type-set for use when
-    #     # `Msg.pld == None|Any`.
-    #     None: msgpack.Decoder(Any),
-    #     Any: msgpack.Decoder(Any),
-    # }
-
-    # 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
-
-    def encode(
-        self,
-        py_obj: Any,
-
-    ) -> bytes:
-        '''
-        Encode input python objects to `msgpack` bytes for transfer
-        on a tranport protocol connection.
-
-        '''
-        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)
-
-    # TODO: do we still want to try and support the sub-decoder with
-    # `.Raw` technique in the case that the `Generic` approach gives
-    # future grief?
-    #
-    # -[ ] <NEW-ISSUE-FOR-ThIS-HERE>
-    #  -> https://jcristharif.com/msgspec/api.html#raw
-    #
-    #def mk_pld_subdec(
-    #    self,
-    #    payload_types: Union[Type[Struct]],
-
-    #) -> msgpack.Decoder:
-    #    # TODO: sub-decoder suppor for `.pld: Raw`?
-    #    # => see similar notes inside `.msg.types`..
-    #    #
-    #    # not sure we'll end up needing this though it might have
-    #    # unforeseen advantages in terms of enabling encrypted
-    #    # appliciation layer (only) payloads?
-    #    #
-    #    # register sub-payload decoders to load `.pld: Raw`
-    #    # decoded `Msg`-packets using a dynamic lookup (table)
-    #    # instead of a pre-defined msg-spec via `Generic`
-    #    # parameterization.
-    #    #
-    #    (
-    #        tags,
-    #        payload_dec,
-    #    ) = mk_tagged_union_dec(
-    #        tagged_structs=list(payload_types.__args__),
-    #    )
-    #    # register sub-decoders by tag
-    #    subdecs: dict[str, msgpack.Decoder]|None = self._payload_decs
-    #    for name in tags:
-    #        subdecs.setdefault(
-    #            name,
-    #            payload_dec,
-    #        )
-
-    #    return payload_dec
-
-    # sub-decoders for retreiving embedded
-    # payload data and decoding to a sender
-    # side defined (struct) type.
-    # def dec_payload(
-    #     codec: MsgCodec,
-    #     msg: Msg,
-
-    # ) -> Any|Struct:
-
-    #     msg: Msg = codec.dec.decode(msg)
-    #     payload_tag: str = msg.header.payload_tag
-    #     payload_dec: msgpack.Decoder = codec._payload_decs[payload_tag]
-    #     return payload_dec.decode(msg.pld)
-
-    # def enc_payload(
-    #     codec: MsgCodec,
-    #     payload: Any,
-    #     cid: str,
-
-    # ) -> bytes:
-
-    #     # tag_field: str|None = None
-
-    #     plbytes = codec.enc.encode(payload)
-    #     if b'msg_type' in plbytes:
-    #         assert isinstance(payload, Struct)
-
-    #         # tag_field: str = type(payload).__name__
-    #         payload = msgspec.Raw(plbytes)
-
-    #     msg = Msg(
-    #         cid=cid,
-    #         pld=payload,
-    #         # Header(
-    #         #     payload_tag=tag_field,
-    #         #     # dialog_id,
-    #         # ),
-    #     )
-    #     return codec.enc.encode(msg)
-
-
-
-# TODO: sub-decoded `Raw` fields?
-# -[ ] see `MsgCodec._payload_decs` notes
-#
-# XXX if we wanted something more complex then field name str-keys
-# we might need a header field type to describe the lookup sys?
-# class Header(Struct, tag=True):
-#     '''
-#     A msg header which defines payload properties
-
-#     '''
-#     payload_tag: str|None = None
-
-
- #def mk_tagged_union_dec(
-    # tagged_structs: list[Struct],
-
- #) -> tuple[
-    # list[str],
-    # msgpack.Decoder,
- #]:
-    # '''
-    # Create a `msgpack.Decoder` for an input `list[msgspec.Struct]`
-    # and return a `list[str]` of each struct's `tag_field: str` value
-    # which can be used to "map to" the initialized dec.
-
-    # '''
-    # # See "tagged unions" docs:
-    # # https://jcristharif.com/msgspec/structs.html#tagged-unions
-
-    # # "The quickest way to enable tagged unions is to set tag=True when
-    # # defining every struct type in the union. In this case tag_field
-    # # defaults to "type", and tag defaults to the struct class name
-    # # (e.g. "Get")."
-    # first: Struct = tagged_structs[0]
-    # types_union: Union[Type[Struct]] = Union[
-    #    first
-    # ]|Any
-    # tags: list[str] = [first.__name__]
-
-    # for struct in tagged_structs[1:]:
-    #     types_union |= struct
-    #     tags.append(
-    #         getattr(
-    #             struct,
-    #             struct.__struct_config__.tag_field,
-    #             struct.__name__,
-    #         )
-    #     )
-
-    # dec = msgpack.Decoder(types_union)
-    # return (
-    #     tags,
-    #     dec,
-    # )
-
-
-def mk_codec(
-    ipc_msg_spec: Union[Type[Struct]]|Any|None = None,
-    #
-    # ^TODO^: in the long run, do we want to allow using a diff IPC `Msg`-set?
-    # it would break the runtime, but maybe say if you wanted
-    # to add some kinda field-specific or wholesale `.pld` ecryption?
-
-    # struct type unions set for `Decoder`
-    # https://jcristharif.com/msgspec/structs.html#tagged-unions
-    ipc_pld_spec: Union[Type[Struct]]|Any|None = None,
-
-    # 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]]  # `Msg.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,
-    # ------ - ------
-    **kwargs,
-    #
-    # 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` ;).
-
-    '''
-    if (
-        ipc_msg_spec is not None
-        and ipc_pld_spec
-    ):
-        raise RuntimeError(
-            f'If a payload spec is provided,\n'
-            "the builtin SC-shuttle-protocol's msg set\n"
-            f'(i.e. `{Msg}`) MUST be used!\n\n'
-            f'However both values were passed as => mk_codec(\n'
-            f'   ipc_msg_spec={ipc_msg_spec}`\n'
-            f'   ipc_pld_spec={ipc_pld_spec}`\n)\n'
-        )
-
-    elif (
-        ipc_pld_spec
-        and
-
-        # XXX required for now (or maybe forever?) until
-        # we can dream up a way to allow parameterizing and/or
-        # custom overrides to the `Msg`-spec protocol itself?
-        ipc_msg_spec is None
-    ):
-        # (manually) generate a msg-payload-spec for all relevant
-        # god-boxing-msg subtypes, parameterizing the `Msg.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
-
-    else:
-        ipc_msg_spec = ipc_msg_spec or Any
-
-    enc = msgpack.Encoder(
-       enc_hook=enc_hook,
-    )
-    dec = msgpack.Decoder(
-        type=ipc_msg_spec,  # like `Msg[Any]`
-        dec_hook=dec_hook,
-    )
-
-    codec = MsgCodec(
-        _enc=enc,
-        _dec=dec,
-        pld_spec=ipc_pld_spec,
-        # payload_msg_specs=payload_msg_specs,
-        # **kwargs,
-    )
-
-    # 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_msg_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 `Msg.pld` payload,
-# https://jcristharif.com/msgspec/supported-types.html
-#
-_def_tractor_codec: MsgCodec = mk_codec(
-    ipc_pld_spec=Any,
-)
-# 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.
-#
-
-# TODO: STOP USING THIS, since it's basically a global and won't
-# allow sub-IPC-ctxs to limit the msg-spec however desired..
-_ctxvar_MsgCodec: MsgCodec = RunVar(
-    'msgspec_codec',
-
-    # TODO: move this to our new `Msg`-spec!
-    default=_def_msgspec_codec,
-    # default=_def_tractor_codec,
-)
-
-
-@cm
-def apply_codec(
-    codec: MsgCodec,
-
-) -> MsgCodec:
-    '''
-    Dynamically apply a `MsgCodec` to the current task's
-    runtime context such that all IPC msgs are processed
-    with it for that task.
-
-    Uses a `tricycle.TreeVar` to ensure the scope of the codec
-    matches the `@cm` block and DOES NOT change to the original
-    (default) value in new tasks (as it does for `ContextVar`).
-
-    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
-
-    '''
-    orig: MsgCodec = _ctxvar_MsgCodec.get()
-    assert orig is not codec
-    token: RunVarToken = _ctxvar_MsgCodec.set(codec)
-
-    # TODO: for TreeVar approach, see docs for @cm `.being()` API:
-    # https://tricycle.readthedocs.io/en/latest/reference.html#tree-variables
-    # try:
-    #     with _ctxvar_MsgCodec.being(codec):
-    #         new = _ctxvar_MsgCodec.get()
-    #         assert new is codec
-    #         yield codec
-
-    try:
-        yield _ctxvar_MsgCodec.get()
-    finally:
-        _ctxvar_MsgCodec.reset(token)
-
-    assert _ctxvar_MsgCodec.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_types: 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,
-):
-    '''
-    Apply a `MsgCodec` that will natively decode the SC-msg set's
-    `Msg.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`.
-
-    '''
-    msgspec_codec: MsgCodec = mk_codec(
-        payload_types=payload_types,
-        **codec_kwargs,
-    )
-    with apply_codec(msgspec_codec) as applied_codec:
-        assert applied_codec is msgspec_codec
-        yield msgspec_codec

tractor/msg/pretty_struct.py

@@ -1,274 +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,
-)
-
-# 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,
-        )
-
-
-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
-
-    def pformat(
-        self,
-        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 + self.__class__.__qualname__
-        qtn: str = self.__class__.__qualname__
-
-        obj_str: str = ''  # accumulator
-        fi: structs.FieldInfo
-        k: str
-        v: Any
-        for fi, k, v in iter_fields(self):
-
-            # 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
-                val_str: str = saferepr(v)
-
-            # 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})'
-        )
-
-    # TODO: use a pprint.PrettyPrinter instance around ONLY rendering
-    # inside a known tty?
-    # def __repr__(self) -> str:
-    #     ...
-
-    # __str__ = __repr__ = pformat
-    __repr__ = pformat
-
-    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/types.py

@@ -1,629 +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,
-    Callable,
-    Generic,
-    Literal,
-    Type,
-    TypeVar,
-    Union,
-)
-
-from msgspec import (
-    defstruct,
-    # field,
-    Struct,
-    # UNSET,
-    # UnsetType,
-)
-
-from tractor.msg import (
-    pretty_struct,
-)
-
-# type variable for the boxed payload field `.pld`
-PayloadT = TypeVar('PayloadT')
-
-
-class Msg(
-    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,
-):
-    '''
-    The "god" boxing msg type.
-
-    Boxes user data-msgs in a `.pld` and uses `msgspec`'s tagged
-    unions support to enable a spec from a common msg inheritance
-    tree.
-
-    '''
-    cid: str|None  # 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 msgs "payload" (spelled without vowels):
-    # https://en.wikipedia.org/wiki/Payload_(computing)
-    #
-    # NOTE: inherited from any `Msg` (and maybe overriden
-    # by use of `limit_msg_spec()`), 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.
-    pld: PayloadT
-
-
-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.
-
-    '''
-    _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 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
-
-    kwargs: dict
-    uid: tuple[str, str]  # (calling) actor-id
-
-
-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?
-    ]
-
-    # TODO: as part of the reponse we should report our allowed
-    # msg spec which should be generated from the type-annots as
-    # desired in # https://github.com/goodboy/tractor/issues/365
-    # When this does not match what the starter/caller side
-    # expects we of course raise a `TypeError` just like if
-    # a function had been called using an invalid signature.
-    #
-    # msgspec: MsgSpec
-
-
-class Started(
-    Msg,
-    Generic[PayloadT],
-):
-    '''
-    Packet to shuttle the "first value" delivered by
-    `Context.started(value: Any)` from a `@tractor.context`
-    decorated IPC endpoint.
-
-    '''
-    pld: PayloadT
-
-
-# TODO: instead of using our existing `Start`
-# for this (as we did with the original `{'cmd': ..}` style)
-# class Cancel(Msg):
-#     cid: str
-
-
-class Yield(
-    Msg,
-    Generic[PayloadT],
-):
-    '''
-    Per IPC transmission of a value from `await MsgStream.send(<value>)`.
-
-    '''
-    pld: PayloadT
-
-
-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
-
-
-class Return(
-    Msg,
-    Generic[PayloadT],
-):
-    '''
-    Final `return <value>` from a remotely scheduled
-    func-as-`trio.Task`.
-
-    '''
-    pld: PayloadT
-
-
-class Error(
-    Struct,
-    tag=True,
-    tag_field='msg_type',
-):
-    '''
-    A pkt that wraps `RemoteActorError`s for relay and raising.
-
-    Fields are 1-to-1 meta-data as needed originally by
-    `RemoteActorError.msgdata: dict`.
-
-    '''
-    src_uid: tuple[str, str]
-    src_type_str: str
-    boxed_type_str: str
-    relay_path: list[tuple[str, str]]
-    tb_str: str
-
-    cid: str|None = None
-
-    # TODO: use UNSET or don't include them via
-    #
-    # `ContextCancelled`
-    canceller: tuple[str, str]|None = None
-
-    # `StreamOverrun`
-    sender: tuple[str, str]|None = None
-
-
-# TODO: should be make a msg version of `ContextCancelled?`
-# and/or with a scope field or a full `ActorCancelled`?
-# class Cancelled(Msg):
-#     cid: str
-
-# TODO what about overruns?
-# class Overrun(Msg):
-#     cid: str
-
-
-# built-in SC shuttle protocol msg type set in
-# approx order of the IPC txn-state spaces.
-__spec__: list[Msg] = [
-
-    # identity handshake
-    Aid,
-
-    # spawn specification from parent
-    SpawnSpec,
-
-    # inter-actor RPC initiation
-    Start,
-    StartAck,
-
-    # no-outcome-yet IAC (inter-actor-communication)
-    Started,
-    Yield,
-    Stop,
-
-    # termination outcomes
-    Return,
-    Error,
-]
-
-_runtime_spec_msgs: list[Msg] = [
-    Aid,
-    SpawnSpec,
-    Start,
-    StartAck,
-    Stop,
-    Error,
-]
-_payload_spec_msgs: list[Msg] = [
-    Started,
-    Yield,
-    Return,
-]
-
-
-def mk_msg_spec(
-    payload_type_union: Union[Type] = Any,
-
-    # boxing_msg_set: list[Msg] = _payload_spec_msgs,
-    spec_build_method: Literal[
-        'indexed_generics',  # works
-        'defstruct',
-        'types_new_class',
-
-    ] = 'indexed_generics',
-
-) -> tuple[
-    Union[Type[Msg]],
-    list[Type[Msg]],
-]:
-    '''
-    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 via the `Msg.pld:
-    PayloadT` type var. 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]`.
-
-    '''
-    submsg_types: list[Type[Msg]] = 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 __spec__:
-
-        # 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_spec_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]
-
-    return (
-        pld_spec | runtime_spec,
-        msgtypes_table[spec_build_method] + ipc_msg_types,
-    )
-
-
-# TODO: make something similar to this inside `._codec` such that
-# user can just pass a type table of some sort?
-# 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.
-
-#     '''
-#     def enc_to_dict(msg: Any) -> Any:
-#         '''
-#         Encode `Msg`-structs to `dict` msgs instead
-#         of using `msgspec.msgpack.Decoder.type`-ed
-#         features.
-
-#         '''
-#         match msg:
-#             case Start():
-#                 dctmsg: dict = pretty_struct.Struct.to_dict(
-#                     msg
-#                 )['pld']
-
-#             case Error():
-#                 dctmsg: dict = pretty_struct.Struct.to_dict(
-#                     msg
-#                 )['pld']
-#                 return {'error': dctmsg}
-
-
-#     def dec_from_dict(
-#         type: Type,
-#         obj: Any,
-#     ) -> Any:
-#         '''
-#         Decode to `Msg`-structs from `dict` msgs instead
-#         of using `msgspec.msgpack.Decoder.type`-ed
-#         features.
-
-#         '''
-#         cid: str = obj.get('cid')
-#         match obj:
-#             case {'cmd': pld}:
-#                 return Start(
-#                     cid=cid,
-#                     pld=pld,
-#                 )
-#             case {'functype': pld}:
-#                 return StartAck(
-#                     cid=cid,
-#                     functype=pld,
-#                     # pld=IpcCtxSpec(
-#                     #     functype=pld,
-#                     # ),
-#                 )
-#             case {'started': pld}:
-#                 return Started(
-#                     cid=cid,
-#                     pld=pld,
-#                 )
-#             case {'yield': pld}:
-#                 return Yield(
-#                     cid=obj['cid'],
-#                     pld=pld,
-#                 )
-#             case {'stop': pld}:
-#                 return Stop(
-#                     cid=cid,
-#                 )
-#             case {'return': pld}:
-#                 return Return(
-#                     cid=cid,
-#                     pld=pld,
-#                 )
-
-#             case {'error': pld}:
-#                 return Error(
-#                     cid=cid,
-#                     pld=ErrorData(
-#                         **pld
-#                     ),
-#                 )
-
-#     return (
-#         # enc_to_dict,
-#         dec_from_dict,
-#     )

tractor/to_asyncio.py

@@ -28,19 +28,16 @@ from typing import (
     Callable,
     AsyncIterator,
     Awaitable,
+    Optional,
 )
 
 import trio
 from outcome import Error
 
-from tractor.log import get_logger
-from tractor._state import (
-    current_actor,
-    debug_mode,
-)
-from tractor.devx import _debug
-from tractor._exceptions import AsyncioCancelled
-from tractor.trionics._broadcast import (
+from .log import get_logger
+from ._state import current_actor
+from ._exceptions import AsyncioCancelled
+from .trionics._broadcast import (
     broadcast_receiver,
     BroadcastReceiver,
 )
@@ -68,9 +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()
@@ -162,9 +159,7 @@ def _run_asyncio_task(
     '''
     __tracebackhide__ = True
     if not current_actor().is_infected_aio():
-        raise RuntimeError(
-            "`infect_asyncio` mode is not enabled!?"
-        )
+        raise RuntimeError("`infect_asyncio` mode is not enabled!?")
 
     # ITC (inter task comms), these channel/queue names are mostly from
     # ``asyncio``'s perspective.
@@ -193,7 +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
@@ -222,14 +217,7 @@ def _run_asyncio_task(
         try:
             result = await coro
         except BaseException as aio_err:
-            if isinstance(aio_err, CancelledError):
-                log.runtime(
-                    '`asyncio` task was cancelled..\n'
-                )
-            else:
-                log.exception(
-                    '`asyncio` task errored\n'
-                )
+            log.exception('asyncio task errored')
             chan._aio_err = aio_err
             raise
 
@@ -259,7 +247,7 @@ 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,
@@ -268,18 +256,6 @@ def _run_asyncio_task(
     )
     chan._aio_task = task
 
-    # XXX TODO XXX get this actually workin.. XD
-    # maybe setup `greenback` for `asyncio`-side task REPLing
-    if (
-        debug_mode()
-        and
-        (greenback := _debug.maybe_import_greenback(
-            force_reload=True,
-            raise_not_found=False,
-        ))
-    ):
-        greenback.bestow_portal(task)
-
     def cancel_trio(task: asyncio.Task) -> None:
         '''
         Cancel the calling ``trio`` task on error.
@@ -287,7 +263,7 @@ def _run_asyncio_task(
         '''
         nonlocal chan
         aio_err = chan._aio_err
-        task_err: BaseException|None = None
+        task_err: Optional[BaseException] = None
 
         # only to avoid ``asyncio`` complaining about uncaptured
         # task exceptions
@@ -296,22 +272,12 @@ def _run_asyncio_task(
         except BaseException as terr:
             task_err = terr
 
-            msg: str = (
-                'Infected `asyncio` task {etype_str}\n'
-                f'|_{task}\n'
-            )
             if isinstance(terr, CancelledError):
-                log.cancel(
-                    msg.format(etype_str='cancelled')
-                )
+                log.cancel(f'`asyncio` task cancelled: {task.get_name()}')
             else:
-                log.exception(
-                    msg.format(etype_str='cancelled')
-                )
+                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?
@@ -324,23 +290,19 @@ def _run_asyncio_task(
             # We might want to change this in the future though.
             from_aio.close()
 
-            if task_err is None:
-                assert aio_err
-                aio_err.with_traceback(aio_err.__traceback__)
-                # log.error(
-                #     'infected task errorred'
-                # )
-
-            # TODO: show that the cancellation originated
-            # from the ``trio`` side? right?
-            # elif type(aio_err) is CancelledError:
-            #     log.cancel(
-            #         'infected task was cancelled'
-            #     )
+            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
+                aio_err.with_traceback(aio_err.__traceback__)
+                log.error('infected task errorred')
+
             # XXX: alway cancel the scope on error
             # in case the trio task is blocking
             # on a checkpoint.
@@ -367,11 +329,11 @@ 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 (
@@ -549,16 +511,6 @@ def run_as_asyncio_guest(
         loop = asyncio.get_running_loop()
         trio_done_fut = asyncio.Future()
 
-        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,
-            )
-
         def trio_done_callback(main_outcome):
 
             if isinstance(main_outcome, Error):

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
@@ -168,7 +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:
@@ -456,7 +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

@@ -33,9 +33,10 @@ from typing import (
 )
 
 import trio
+from trio_typing import TaskStatus
 
-from tractor._state import current_actor
-from tractor.log import get_logger
+from .._state import current_actor
+from ..log import get_logger
 
 
 log = get_logger(__name__)
@@ -69,7 +70,6 @@ async def _enter_and_wait(
     unwrapped: dict[int, T],
     all_entered: trio.Event,
     parent_exit: trio.Event,
-    seed: int,
 
 ) -> None:
     '''
@@ -80,10 +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()
@@ -94,13 +91,7 @@ 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, each in
     a separate ``trio`` task and deliver the unwrapped values in the
@@ -113,11 +104,7 @@ async def gather_contexts(
     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()
@@ -129,9 +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:
@@ -142,7 +128,6 @@ async def gather_contexts(
                 unwrapped,
                 all_entered,
                 parent_exit,
-                seed,
             )
 
         # deliver control once all managers have started up
@@ -183,7 +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:
@@ -224,7 +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.
@@ -232,7 +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
@@ -254,7 +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}'
@@ -282,7 +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.
@@ -292,9 +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)