.github/workflows/ci.yml

@@ -1,11 +1,6 @@
 name: CI
 
-on:
-  # any time someone pushes a new branch to origin
-  push:
-
-  # Allows you to run this workflow manually from the Actions tab
-  workflow_dispatch:
+on: push
 
 jobs:
 
@@ -20,35 +15,13 @@ jobs:
       - name: Setup python
         uses: actions/setup-python@v2
         with:
-          python-version: '3.10'
+          python-version: '3.9'
 
       - name: Install dependencies
         run: pip install -U . --upgrade-strategy eager -r requirements-test.txt
 
       - name: Run MyPy check
-        run: mypy tractor/ --ignore-missing-imports --show-traceback
-
-  # test that we can generate a software distribution and install it
-  # thus avoid missing file issues after packaging.
-  sdist-linux:
-    name: 'sdist'
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-
-      - name: Setup python
-        uses: actions/setup-python@v2
-        with:
-          python-version: '3.10'
-
-      - name: Build sdist
-        run: python setup.py sdist --formats=zip
-
-      - name: Install sdist from .zips
-        run: python -m pip install dist/*.zip
-
+        run: mypy tractor/ --ignore-missing-imports
 
   testing-linux:
     name: '${{ matrix.os }} Python ${{ matrix.python }} - ${{ matrix.spawn_backend }}'
@@ -59,12 +32,8 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python: ['3.10']
-        spawn_backend: [
-          'trio',
-          'mp_spawn',
-          'mp_forkserver',
-        ]
+        python: ['3.9', '3.10']
+        spawn_backend: ['trio', 'mp']
 
     steps:
 
@@ -79,53 +48,71 @@ jobs:
       - name: Install dependencies
         run: pip install -U . -r requirements-test.txt -r requirements-docs.txt --upgrade-strategy eager
 
-      - name: List dependencies
-        run: pip list
+      - name: Run tests
+        run: pytest tests/ --spawn-backend=${{ matrix.spawn_backend }} -rs
+
+  testing-linux-msgspec:
+    # runs jobs on all OS's but with optional `msgspec` dep installed
+    name: '${{ matrix.os }} Python ${{ matrix.python }} - ${{ matrix.spawn_backend }} - msgspec'
+    timeout-minutes: 10
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        python: ['3.9', '3.10']
+        spawn_backend: ['trio', 'mp']
+
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '${{ matrix.python }}'
+
+      - name: Install dependencies
+        run: pip install -U .[msgspec] -r requirements-test.txt -r requirements-docs.txt --upgrade-strategy eager
 
       - name: Run tests
-        run: pytest tests/ --spawn-backend=${{ matrix.spawn_backend }} -rsx
+        run: pytest tests/ --spawn-backend=${{ matrix.spawn_backend }} -rs
 
-  # We skip 3.10 on windows for now due to not having any collabs to
-  # debug the CI failures. Anyone wanting to hack and solve them is very
-  # welcome, but our primary user base is not using that OS.
+  # We skip 3.10 on windows for now due to
+  # https://github.com/pytest-dev/pytest/issues/8733
+  # some kinda weird `pyreadline` issue..
 
   # TODO: use job filtering to accomplish instead of repeated
   # boilerplate as is above XD:
   # - https://docs.github.com/en/actions/learn-github-actions/managing-complex-workflows
   # - https://docs.github.com/en/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
   # - https://docs.github.com/en/actions/learn-github-actions/workflow-syntax-for-github-actions#jobsjob_idif
-  # testing-windows:
-  #   name: '${{ matrix.os }} Python ${{ matrix.python }} - ${{ matrix.spawn_backend }}'
-  #   timeout-minutes: 12
-  #   runs-on: ${{ matrix.os }}
+  testing-windows:
+    name: '${{ matrix.os }} Python ${{ matrix.python }} - ${{ matrix.spawn_backend }}'
+    timeout-minutes: 12
+    runs-on: ${{ matrix.os }}
 
-  #   strategy:
-  #     fail-fast: false
-  #     matrix:
-  #       os: [windows-latest]
-  #       python: ['3.10']
-  #       spawn_backend: ['trio', 'mp']
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-latest]
+        python: ['3.9']
+        spawn_backend: ['trio', 'mp']
 
-  #   steps:
+    steps:
 
-  #     - name: Checkout
-  #       uses: actions/checkout@v2
+      - name: Checkout
+        uses: actions/checkout@v2
 
-  #     - name: Setup python
-  #       uses: actions/setup-python@v2
-  #       with:
-  #         python-version: '${{ matrix.python }}'
+      - name: Setup python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '${{ matrix.python }}'
 
-  #     - name: Install dependencies
-  #       run: pip install -U . -r requirements-test.txt -r requirements-docs.txt --upgrade-strategy eager
+      - name: Install dependencies
+        run: pip install -U . -r requirements-test.txt -r requirements-docs.txt --upgrade-strategy eager
 
-  #     # TODO: pretty sure this solves debugger deps-issues on windows, but it needs to
-  #     # be verified by someone with a native setup.
-  #     # - name: Force pyreadline3
-  #     #   run: pip uninstall pyreadline; pip install -U pyreadline3
-
-  #     - name: List dependencies
-  #       run: pip list
-
-  #     - name: Run tests
-  #       run: pytest tests/ --spawn-backend=${{ matrix.spawn_backend }} -rsx
+      - name: Run tests
+        run: pytest tests/ --spawn-backend=${{ matrix.spawn_backend }} -rs

MANIFEST.in

@@ -1,2 +0,0 @@
-# https://packaging.python.org/en/latest/guides/using-manifest-in/#using-manifest-in
-include docs/README.rst

NEWS.rst

@@ -4,148 +4,6 @@ Changelog
 
 .. towncrier release notes start
 
-tractor 0.1.0a5 (2022-08-03)
-============================
-
-This is our final release supporting Python 3.9 since we will be moving
-internals to the new `match:` syntax from 3.10 going forward and
-further, we have officially dropped usage of the `msgpack` library and
-happily adopted `msgspec`.
-
-Features
---------
-
-- `#165 <https://github.com/goodboy/tractor/issues/165>`_: Add SIGINT
-  protection to our `pdbpp` based debugger subystem such that for
-  (single-depth) actor trees in debug mode we ignore interrupts in any
-  actor currently holding the TTY lock thus avoiding clobbering IPC
-  connections and/or task and process state when working in the REPL.
-
-  As a big note currently so called "nested" actor trees (trees with
-  actors having more then one parent/ancestor) are not fully supported
-  since we don't yet have a mechanism to relay the debug mode knowledge
-  "up" the actor tree (for eg. when handling a crash in a leaf actor).
-  As such currently there is a set of tests and known scenarios which will
-  result in process cloberring by the zombie repaing machinery and these
-  have been documented in https://github.com/goodboy/tractor/issues/320.
-
-  The implementation details include:
-
-  - utilizing a custom SIGINT handler which we apply whenever an actor's
-    runtime enters the debug machinery, which we also make sure the
-    stdlib's `pdb` configuration doesn't override (which it does by
-    default without special instance config).
-  - litter the runtime with `maybe_wait_for_debugger()` mostly in spots
-    where the root actor should block before doing embedded nursery
-    teardown ops which both cancel potential-children-in-deubg as well
-    as eventually trigger zombie reaping machinery.
-  - hardening of the TTY locking semantics/API both in terms of IPC
-    terminations and cancellation and lock release determinism from
-    sync debugger instance methods.
-  - factoring of locking infrastructure into a new `._debug.Lock` global
-    which encapsulates all details of the ``trio`` sync primitives and
-    task/actor uid management and tracking.
-
-  We also add `ctrl-c` cases throughout the test suite though these are
-  disabled for py3.9 (`pdbpp` UX differences that don't seem worth
-  compensating for, especially since this will be our last 3.9 supported
-  release) and there are a slew of marked cases that aren't expected to
-  work in CI more generally (as mentioned in the "nested" tree note
-  above) despite seemingly working  when run manually on linux.
-
-- `#304 <https://github.com/goodboy/tractor/issues/304>`_: Add a new
-  ``to_asyncio.LinkedTaskChannel.subscribe()`` which gives task-oriented
-  broadcast functionality semantically equivalent to
-  ``tractor.MsgStream.subscribe()`` this makes it possible for multiple
-  ``trio``-side tasks to consume ``asyncio``-side task msgs in tandem.
-
-  Further Improvements to the test suite were added in this patch set
-  including a new scenario test for a sub-actor managed "service nursery"
-  (implementing the basics of a "service manager") including use of
-  *infected asyncio* mode. Further we added a lower level
-  ``test_trioisms.py`` to start to track issues we need to work around in
-  ``trio`` itself which in this case included a bug we were trying to
-  solve related to https://github.com/python-trio/trio/issues/2258.
-
-
-Bug Fixes
----------
-
-- `#318 <https://github.com/goodboy/tractor/issues/318>`_: Fix
-  a previously undetected ``trio``-``asyncio`` task lifetime linking
-  issue with the ``to_asyncio.open_channel_from()`` api where both sides
-  where not properly waiting/signalling termination and it was possible
-  for ``asyncio``-side errors to not propagate due to a race condition.
-
-  The implementation fix summary is:
-  - add state to signal the end of the ``trio`` side task to be
-    read by the ``asyncio`` side and always cancel any ongoing
-    task in such cases.
-  - always wait on the ``asyncio`` task termination from the ``trio``
-    side on error before maybe raising said error.
-  - always close the ``trio`` mem chan on exit to ensure the other
-    side can detect it and follow.
-
-
-Trivial/Internal Changes
-------------------------
-
-- `#248 <https://github.com/goodboy/tractor/issues/248>`_: Adjust the
-  `tractor._spawn.soft_wait()` strategy to avoid sending an actor cancel
-  request (via `Portal.cancel_actor()`) if either the child process is
-  detected as having terminated or the IPC channel is detected to be
-  closed.
-
-  This ensures (even) more deterministic inter-actor cancellation by
-  avoiding the timeout condition where possible when a whild never
-  sucessfully spawned, crashed, or became un-contactable over IPC.
-
-- `#295 <https://github.com/goodboy/tractor/issues/295>`_: Add an
-  experimental ``tractor.msg.NamespacePath`` type for passing Python
-  objects by "reference" through a ``str``-subtype message and using the
-  new ``pkgutil.resolve_name()`` for reference loading.
-
-- `#298 <https://github.com/goodboy/tractor/issues/298>`_: Add a new
-  `tractor.experimental` subpackage for staging new high level APIs and
-  subystems that we might eventually make built-ins.
-
-- `#300 <https://github.com/goodboy/tractor/issues/300>`_: Update to and
-  pin latest ``msgpack`` (1.0.3) and ``msgspec`` (0.4.0) both of which
-  required adjustments for backwards imcompatible API tweaks.
-
-- `#303 <https://github.com/goodboy/tractor/issues/303>`_: Fence off
-  ``multiprocessing`` imports until absolutely necessary in an effort to
-  avoid "resource tracker" spawning side effects that seem to have
-  varying degrees of unreliability per Python release. Port to new
-  ``msgspec.DecodeError``.
-
-- `#305 <https://github.com/goodboy/tractor/issues/305>`_: Add
-  ``tractor.query_actor()`` an addr looker-upper which doesn't deliver
-  a ``Portal`` instance and instead just a socket address ``tuple``.
-
-  Sometimes it's handy to just have a simple way to figure out if
-  a "service" actor is up, so add this discovery helper for that. We'll
-  prolly just leave it undocumented for now until we figure out
-  a longer-term/better discovery system.
-
-- `#316 <https://github.com/goodboy/tractor/issues/316>`_: Run windows
-  CI jobs on python 3.10 after some hacks for ``pdbpp`` dependency
-  issues.
-
-  Issue was to do with the now deprecated `pyreadline` project which
-  should be changed over to `pyreadline3`.
-
-- `#317 <https://github.com/goodboy/tractor/issues/317>`_: Drop use of
-  the ``msgpack`` package and instead move fully to the ``msgspec``
-  codec library.
-
-  We've now used ``msgspec`` extensively in production and there's no
-  reason to not use it as default. Further this change preps us for the up
-  and coming typed messaging semantics (#196), dialog-unprotocol system
-  (#297), and caps-based messaging-protocols (#299) planned before our
-  first beta.
-
-
 tractor 0.1.0a4 (2021-12-18)
 ============================
 

docs/README.rst

@@ -3,20 +3,13 @@
 |gh_actions|
 |docs|
 
-``tractor`` is a `structured concurrent`_, 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
-non-shared-memory threads) which maintain structured
-concurrency (SC) *end-to-end* inside a *supervision tree*.
-
-Cross-process (and thus cross-host) SC is accomplished through the
-combined use of our "actor nurseries_" and an "SC-transitive IPC
-protocol" constructed on top of multiple Pythons each running a ``trio``
+Fundamentally ``tractor`` gives you parallelism via ``trio``-"*actors*":
+our nurseries_ let you spawn new Python processes which each run a ``trio``
 scheduled runtime - a call to ``trio.run()``.
 
-We believe the system adheres to the `3 axioms`_ of an "`actor model`_"
+We believe the system adhere's 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*.
 
@@ -29,10 +22,9 @@ Features
 - **It's just** a ``trio`` API
 - *Infinitely nesteable* process trees
 - Builtin IPC streaming APIs with task fan-out broadcasting
-- A "native" multi-core debugger REPL using `pdbp`_ (a fork & fix of
-  `pdb++`_ thanks to @mdmintz!)
+- A (first ever?) "native" multi-core debugger UX for Python using `pdb++`_
 - Support for a swappable, OS specific, process spawning layer
-- A modular transport stack, allowing for custom serialization (eg. with
+- A modular transport stack, allowing for custom serialization (eg.
   `msgspec`_), communications protocols, and environment specific IPC
   primitives
 - Support for spawning process-level-SC, inter-loop one-to-one-task oriented
@@ -125,7 +117,7 @@ Zombie safe: self-destruct a process tree
             f"running in pid {os.getpid()}"
         )
 
-        await trio.sleep_forever()
+       await trio.sleep_forever()
 
 
     async def main():
@@ -156,7 +148,7 @@ it **is a bug**.
 
 "Native" multi-process debugging
 --------------------------------
-Using the magic of `pdbp`_ and our internal IPC, we've
+Using the magic of `pdb++`_ and our internal IPC, we've
 been able to create a native feeling debugging experience for
 any (sub-)process in your ``tractor`` tree.
 
@@ -497,6 +489,12 @@ From PyPi::
     pip install tractor
 
 
+To try out the (optionally) faster `msgspec`_ codec instead of the
+default ``msgpack`` lib::
+
+    pip install tractor[msgspec]
+
+
 From git::
 
     pip install git+git://github.com/goodboy/tractor.git
@@ -565,22 +563,11 @@ properties of the system.
 
 What's on the TODO:
 -------------------
-Help us push toward the future of distributed `Python`.
+Help us push toward the future.
 
-- Erlang-style supervisors via composed context managers (see `#22
-  <https://github.com/goodboy/tractor/issues/22>`_)
-- Typed messaging protocols (ex. via ``msgspec.Struct``, see `#36
+- Typed messaging protocols (ex. via ``msgspec``, see `#36
   <https://github.com/goodboy/tractor/issues/36>`_)
-- Typed capability-based (dialog) protocols ( see `#196
-  <https://github.com/goodboy/tractor/issues/196>`_ with draft work
-  started in `#311 <https://github.com/goodboy/tractor/pull/311>`_)
-- We **recently disabled CI-testing on windows** and need help getting
-  it running again! (see `#327
-  <https://github.com/goodboy/tractor/pull/327>`_). **We do have windows
-  support** (and have for quite a while) but since no active hacker
-  exists in the user-base to help test on that OS, for now we're not
-  actively maintaining testing due to the added hassle and general
-  latency..
+- Erlang-style supervisors via composed context managers
 
 
 Feel like saying hi?
@@ -592,19 +579,18 @@ say hi, please feel free to reach us in our `matrix channel`_.  If
 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
-.. _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
 .. _actor model: https://en.wikipedia.org/wiki/Actor_model
+.. _trio: https://github.com/python-trio/trio
+.. _multi-processing: https://en.wikipedia.org/wiki/Multiprocessing
 .. _trionic: https://trio.readthedocs.io/en/latest/design.html#high-level-design-principles
 .. _async sandwich: https://trio.readthedocs.io/en/latest/tutorial.html#async-sandwich
+.. _structured concurrent: https://trio.discourse.group/t/concise-definition-of-structured-concurrency/228
 .. _3 axioms: https://www.youtube.com/watch?v=7erJ1DV_Tlo&t=162s
 .. .. _3 axioms: https://en.wikipedia.org/wiki/Actor_model#Fundamental_concepts
 .. _adherance to: https://www.youtube.com/watch?v=7erJ1DV_Tlo&t=1821s
 .. _trio gitter channel: https://gitter.im/python-trio/general
 .. _matrix channel: https://matrix.to/#/!tractor:matrix.org
-.. _pdbp: https://github.com/mdmintz/pdbp
 .. _pdb++: https://github.com/pdbpp/pdbpp
 .. _guest mode: https://trio.readthedocs.io/en/stable/reference-lowlevel.html?highlight=guest%20mode#using-guest-mode-to-run-trio-on-top-of-other-event-loops
 .. _messages: https://en.wikipedia.org/wiki/Message_passing

docs/index.rst

@@ -396,7 +396,7 @@ tasks spawned via multiple RPC calls to an actor can modify
 
 
         # a per process cache
-        _actor_cache: dict[str, bool] = {}
+        _actor_cache: Dict[str, bool] = {}
 
 
         def ping_endpoints(endpoints: List[str]):

examples/advanced_faults/ipc_failure_during_stream.py

@@ -1,151 +0,0 @@
-'''
-Complex edge case where during real-time streaming the IPC tranport
-channels are wiped out (purposely in this example though it could have
-been an outage) and we want to ensure that despite being in debug mode
-(or not) the user can sent SIGINT once they notice the hang and the
-actor tree will eventually be cancelled without leaving any zombies.
-
-'''
-import trio
-from tractor import (
-    open_nursery,
-    context,
-    Context,
-    MsgStream,
-)
-
-
-async def break_channel_silently_then_error(
-    stream: MsgStream,
-):
-    async for msg in stream:
-        await stream.send(msg)
-
-        # XXX: close the channel right after an error is raised
-        # purposely breaking the IPC transport to make sure the parent
-        # doesn't get stuck in debug or hang on the connection join.
-        # this more or less simulates an infinite msg-receive hang on
-        # the other end.
-        await stream._ctx.chan.send(None)
-        assert 0
-
-
-async def close_stream_and_error(
-    stream: MsgStream,
-):
-    async for msg in stream:
-        await stream.send(msg)
-
-        # wipe out channel right before raising
-        await stream._ctx.chan.send(None)
-        await stream.aclose()
-        assert 0
-
-
-@context
-async def recv_and_spawn_net_killers(
-
-    ctx: Context,
-    break_ipc_after: bool | int = False,
-
-) -> None:
-    '''
-    Receive stream msgs and spawn some IPC killers mid-stream.
-
-    '''
-    await ctx.started()
-    async with (
-        ctx.open_stream() as stream,
-        trio.open_nursery() as n,
-    ):
-        async for i in stream:
-            print(f'child echoing {i}')
-            await stream.send(i)
-            if (
-                break_ipc_after
-                and i > break_ipc_after
-            ):
-                '#################################\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',
-
-    # 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,
-
-) -> None:
-
-    async with (
-        open_nursery(
-            start_method=start_method,
-
-            # NOTE: even debugger is used we shouldn't get
-            # a hang since it never engages due to broken IPC
-            debug_mode=debug_mode,
-            loglevel='warning',
-
-        ) as an,
-    ):
-        portal = await an.start_actor(
-            'chitty_hijo',
-            enable_modules=[__name__],
-        )
-
-        async with portal.open_context(
-            recv_and_spawn_net_killers,
-            break_ipc_after=break_child_ipc_after,
-
-        ) 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
-                    ):
-                        print(
-                            '#################################\n'
-                            'Simulating parent-side IPC BREAK!\n'
-                            '#################################'
-                        )
-                        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}')
-                    await stream.send(i)
-
-                    with trio.move_on_after(2) as cs:
-
-                        # 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.
-                        rx = await stream.receive()
-
-                        print(f"I'm a happy user and echoed to me is {rx}")
-
-                    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__':
-    trio.run(main)

examples/debugging/multi_daemon_subactors.py

@@ -27,18 +27,7 @@ async def main():
 
         # retreive results
         async with p0.open_stream_from(breakpoint_forever) as stream:
-
-            # triggers the first name error
-            try:
-                await p1.run(name_error)
-            except tractor.RemoteActorError as rae:
-                assert rae.type is NameError
-
-            async for i in stream:
-
-                # a second time try the failing subactor and this tie
-                # let error propagate up to the parent/nursery.
-                await p1.run(name_error)
+            await p1.run(name_error)
 
 
 if __name__ == '__main__':

examples/debugging/multi_nested_subactors_error_up_through_nurseries.py

@@ -12,31 +12,18 @@ async def breakpoint_forever():
     while True:
         await tractor.breakpoint()
 
-        # NOTE: if the test never sent 'q'/'quit' commands
-        # on the pdb repl, without this checkpoint line the
-        # repl would spin in this actor forever.
-        # await trio.sleep(0)
-
 
 async def spawn_until(depth=0):
     """"A nested nursery that triggers another ``NameError``.
     """
     async with tractor.open_nursery() as n:
         if depth < 1:
-
-            await n.run_in_actor(breakpoint_forever)
-
-            p = await n.run_in_actor(
+            # await n.run_in_actor('breakpoint_forever', breakpoint_forever)
+            await n.run_in_actor(
                 name_error,
                 name='name_error'
             )
-            await trio.sleep(0.5)
-            # rx and propagate error from child
-            await p.result()
-
         else:
-            # recusrive call to spawn another process branching layer of
-            # the tree
             depth -= 1
             await n.run_in_actor(
                 spawn_until,
@@ -66,7 +53,6 @@ async def main():
     """
     async with tractor.open_nursery(
         debug_mode=True,
-        # loglevel='cancel',
     ) as n:
 
         # spawn both actors
@@ -81,16 +67,8 @@ async def main():
             name='spawner1',
         )
 
-        # TODO: test this case as well where the parent don't see
-        # the sub-actor errors by default and instead expect a user
-        # ctrl-c to kill the root.
-        with trio.move_on_after(3):
-            await trio.sleep_forever()
-
         # gah still an issue here.
         await portal.result()
-
-        # should never get here
         await portal1.result()
 
 

examples/debugging/open_ctx_modnofound.py

@@ -1,40 +0,0 @@
-import trio
-import tractor
-
-
-@tractor.context
-async def just_sleep(
-
-    ctx: tractor.Context,
-    **kwargs,
-
-) -> None:
-    '''
-    Start and sleep.
-
-    '''
-    await ctx.started()
-    await trio.sleep_forever()
-
-
-async def main() -> None:
-
-    async with tractor.open_nursery(
-        debug_mode=True,
-    ) as n:
-        portal = await n.start_actor(
-            'ctx_child',
-
-            # XXX: we don't enable the current module in order
-            # to trigger `ModuleNotFound`.
-            enable_modules=[],
-        )
-
-        async with portal.open_context(
-            just_sleep,  # taken from pytest parameterization
-        ) as (ctx, sent):
-            raise KeyboardInterrupt
-
-
-if __name__ == '__main__':
-    trio.run(main)

examples/debugging/restore_builtin_breakpoint.py

@@ -1,24 +0,0 @@
-import os
-import sys
-
-import trio
-import tractor
-
-
-async def main() -> None:
-    async with tractor.open_nursery(debug_mode=True) as an:
-
-        assert os.environ['PYTHONBREAKPOINT'] == 'tractor._debug._set_trace'
-
-        # TODO: an assert that verifies the hook has indeed been, hooked
-        # XD
-        assert sys.breakpointhook is not tractor._debug._set_trace
-
-        breakpoint()
-
-    # TODO: an assert that verifies the hook is unhooked..
-    assert sys.breakpointhook
-    breakpoint()
-
-if __name__ == '__main__':
-    trio.run(main)

examples/debugging/subactor_bp_in_ctx.py

@@ -1,50 +0,0 @@
-import tractor
-import trio
-
-
-async def gen():
-    yield 'yo'
-    await tractor.breakpoint()
-    yield 'yo'
-    await tractor.breakpoint()
-
-
-@tractor.context
-async def just_bp(
-    ctx: tractor.Context,
-) -> None:
-
-    await ctx.started()
-    await tractor.breakpoint()
-
-    # TODO: bps and errors in this call..
-    async for val in gen():
-        print(val)
-
-    # await trio.sleep(0.5)
-
-    # prematurely destroy the connection
-    await ctx.chan.aclose()
-
-    # THIS CAUSES AN UNRECOVERABLE HANG
-    # without latest ``pdbpp``:
-    assert 0
-
-
-
-async def main():
-    async with tractor.open_nursery(
-        debug_mode=True,
-    ) as n:
-        p = await n.start_actor(
-            'bp_boi',
-            enable_modules=[__name__],
-        )
-        async with p.open_context(
-            just_bp,
-        ) as (ctx, first):
-            await trio.sleep_forever()
-
-
-if __name__ == '__main__':
-    trio.run(main)

examples/infected_asyncio_echo_server.py

@@ -13,7 +13,6 @@ import tractor
 async def aio_echo_server(
     to_trio: trio.MemorySendChannel,
     from_trio: asyncio.Queue,
-
 ) -> None:
 
     # a first message must be sent **from** this ``asyncio``

examples/integration/open_context_and_sleep.py

@@ -1,49 +0,0 @@
-import trio
-import click
-import tractor
-import pydantic
-# from multiprocessing import shared_memory
-
-
-@tractor.context
-async def just_sleep(
-
-    ctx: tractor.Context,
-    **kwargs,
-
-) -> None:
-    '''
-    Test a small ping-pong 2-way streaming server.
-
-    '''
-    await ctx.started()
-    await trio.sleep_forever()
-
-
-async def main() -> None:
-
-    proc = await trio.open_process( (
-        'python',
-        '-c',
-        'import trio; trio.run(trio.sleep_forever)',
-    ))
-    await proc.wait()
-    # await trio.sleep_forever()
-    # async with tractor.open_nursery() as n:
-
-    #     portal = await n.start_actor(
-    #         'rpc_server',
-    #         enable_modules=[__name__],
-    #     )
-
-    #     async with portal.open_context(
-    #         just_sleep,  # taken from pytest parameterization
-    #     ) as (ctx, sent):
-    #         await trio.sleep_forever()
-
-
-
-if __name__ == '__main__':
-    import time
-    # time.sleep(999)
-    trio.run(main)

examples/parallelism/concurrent_actors_primes.py

@@ -9,7 +9,7 @@ is ``tractor``'s channels.
 
 """
 from contextlib import asynccontextmanager
-from typing import Callable
+from typing import List, Callable
 import itertools
 import math
 import time
@@ -71,8 +71,8 @@ async def worker_pool(workers=4):
 
         async def _map(
             worker_func: Callable[[int], bool],
-            sequence: list[int]
-        ) -> list[bool]:
+            sequence: List[int]
+        ) -> List[bool]:
 
             # define an async (local) task to collect results from workers
             async def send_result(func, value, portal):

nooz/248.misc.rst

@@ -0,0 +1,8 @@
+Adjust the `tractor._spawn.soft_wait()` strategy to avoid sending an
+actor cancel request (via `Portal.cancel_actor()`) if either the child
+process is detected as having terminated or the IPC channel is detected
+to be closed.
+
+This ensures (even) more deterministic inter-actor cancellation by
+avoiding the timeout condition where possible when a whild never
+sucessfully spawned, crashed, or became un-contactable over IPC.

nooz/322.trivial.rst

@@ -1,16 +0,0 @@
-Strictly support Python 3.10+, start runtime machinery reorg
-
-Since we want to push forward using the new `match:` syntax for our
-internal RPC-msg loops, we officially drop 3.9 support for the next
-release which should coincide well with the first release of 3.11.
-
-This patch set also officially removes the ``tractor.run()`` API (which
-has been deprecated for some time) as well as starts an initial re-org
-of the internal runtime core by:
-- renaming ``tractor._actor`` -> ``._runtime``
-- moving the ``._runtime.ActorActor._process_messages()`` and
-  ``._async_main()`` to be module level singleton-task-functions since
-  they are only started once for each connection and actor spawn
-  respectively; this internal API thus looks more similar to (at the
-  time of writing) the ``trio``-internals in ``trio._core._run``.
-- officially remove ``tractor.run()``, now deprecated for some time.

nooz/324.bugfix.rst

@@ -1,4 +0,0 @@
-Only set `._debug.Lock.local_pdb_complete` if has been created.
-
-This can be triggered by a very rare race condition (and thus we have no
-working test yet) but it is known to exist in (a) consumer project(s).

nooz/333.feature.rst

@@ -1,25 +0,0 @@
-Add support for ``trio >= 0.22`` and support for the new Python 3.11
-``[Base]ExceptionGroup`` from `pep 654`_ via the backported
-`exceptiongroup`_ package and some final fixes to the debug mode
-subsystem.
-
-This port ended up driving some (hopefully) final fixes to our debugger
-subsystem including the solution to all lingering stdstreams locking
-race-conditions and deadlock scenarios. This includes extending the
-debugger tests suite as well as cancellation and ``asyncio`` mode cases.
-Some of the notable details:
-
-- always reverting to the ``trio`` SIGINT handler when leaving debug
-  mode.
-- bypassing child attempts to acquire the debug lock when detected
-  to be amdist actor-runtime-cancellation.
-- allowing the root actor to cancel local but IPC-stale subactor
-  requests-tasks for the debug lock when in a "no IPC peers" state.
-
-Further we refined our ``ActorNursery`` semantics to be more similar to
-``trio`` in the sense that parent task errors are always packed into the
-actor-nursery emitted exception group and adjusted all tests and
-examples accordingly.
-
-.. _pep 654: https://peps.python.org/pep-0654/#handling-exception-groups
-.. _exceptiongroup: https://github.com/python-trio/exceptiongroup

nooz/335.trivial.rst

@@ -1,5 +0,0 @@
-Establish an explicit "backend spawning" method table; use it from CI
-
-More clearly lays out the current set of (3) backends: ``['trio',
-'mp_spawn', 'mp_forkserver']`` and adjusts the ``._spawn.py`` internals
-as well as the test suite to accommodate.

nooz/336.trivial.rst

@@ -1,4 +0,0 @@
-Add ``key: Callable[..., Hashable]`` support to ``.trionics.maybe_open_context()``
-
-Gives users finer grained control over cache hit behaviour using
-a callable which receives the input ``kwargs: dict``.

nooz/337.feature.rst

@@ -1,41 +0,0 @@
-Add support for debug-lock blocking using a ``._debug.Lock._blocked:
-set[tuple]`` and add ids when no-more IPC connections with the
-root actor are detected.
-
-This is an enhancement which (mostly) solves a lingering debugger
-locking race case we needed to handle:
-
-- child crashes acquires TTY lock in root and attaches to ``pdb``
-- child IPC goes down such that all channels to the root are broken
-  / non-functional.
-- root is stuck thinking the child is still in debug even though it
-  can't be contacted and the child actor machinery hasn't been
-  cancelled by its parent.
-- root get's stuck in deadlock with child since it won't send a cancel
-  request until the child is finished debugging (to avoid clobbering
-  a child that is actually using the debugger), but the child can't
-  unlock the debugger bc IPC is down and it can't contact the root.
-
-To avoid this scenario add debug lock blocking list via
-`._debug.Lock._blocked: set[tuple]` which holds actor uids for any actor
-that is detected by the root as having no transport channel connections
-(of which at least one should exist if this sub-actor at some point
-acquired the debug lock). The root consequently checks this list for any
-actor that tries to (re)acquire the lock and blocks with
-a ``ContextCancelled``. Further, when a debug condition is tested in
-``._runtime._invoke``, the context's ``._enter_debugger_on_cancel`` is
-set to `False` if the actor was put on the block list then all
-post-mortem / crash handling will be bypassed for that task.
-
-In theory this approach to block list management may cause problems
-where some nested child actor acquires and releases the lock multiple
-times and it gets stuck on the block list after the first use? If this
-turns out to be an issue we can try changing the strat so blocks are
-only added when the root has zero IPC peers left?
-
-Further, this adds a root-locking-task side cancel scope,
-``Lock._root_local_task_cs_in_debug``, which can be ``.cancel()``-ed by the root
-runtime when a stale lock is detected during the IPC channel testing.
-However, right now we're NOT using this since it seems to cause test
-failures likely due to causing pre-mature cancellation and maybe needs
-a bit more experimenting?

nooz/343.trivial.rst

@@ -1,19 +0,0 @@
-Rework our ``.trionics.BroadcastReceiver`` internals to avoid method
-recursion and approach a design and interface closer to ``trio``'s
-``MemoryReceiveChannel``.
-
-The details of the internal changes include:
-
-- implementing a ``BroadcastReceiver.receive_nowait()`` and using it
-  within the async ``.receive()`` thus avoiding recursion from
-  ``.receive()``.
-- failing over to an internal ``._receive_from_underlying()`` when the
-  ``_nowait()`` call raises ``trio.WouldBlock``
-- adding ``BroadcastState.statistics()`` for debugging and testing both
-  internals and by users.
-- add an internal ``BroadcastReceiver._raise_on_lag: bool`` which can be
-  set to avoid ``Lagged`` raising for possible use cases where a user
-  wants to choose between a [cheap or nasty
-  pattern](https://zguide.zeromq.org/docs/chapter7/#The-Cheap-or-Nasty-Pattern)
-  the the particular stream (we use this in ``piker``'s dark clearing
-  engine to avoid fast feeds breaking during HFT periods).

nooz/344.bugfix.rst

@@ -1,11 +0,0 @@
-Always ``list``-cast the ``mngrs`` input to
-``.trionics.gather_contexts()`` and ensure its size otherwise raise
-a ``ValueError``.
-
-Turns out that trying to pass an inline-style generator comprehension
-doesn't seem to work inside the ``async with`` expression? Further, in
-such a case we can get a hang waiting on the all-entered event
-completion when the internal mngrs iteration is a noop. Instead we
-always greedily check a size and error on empty input; the lazy
-iteration of a generator input is not beneficial anyway since we're
-entering all manager instances in concurrent tasks.

nooz/346.bugfix.rst

@@ -1,15 +0,0 @@
-Fixes to ensure IPC (channel) breakage doesn't result in hung actor
-trees; the zombie reaping and general supervision machinery will always
-clean up and terminate.
-
-This includes not only the (mostly minor) fixes to solve these cases but
-also a new extensive test suite in `test_advanced_faults.py` with an
-accompanying highly configurable example module-script in
-`examples/advanced_faults/ipc_failure_during_stream.py`. Tests ensure we
-never get hang or zombies despite operating in debug mode and attempt to
-simulate all possible IPC transport failure cases for a local-host actor
-tree.
-
-Further we simplify `Context.open_stream.__aexit__()` to just call
-`MsgStream.aclose()` directly more or less avoiding a pure duplicate
-code path.

nooz/349.trivial.rst

@@ -1,10 +0,0 @@
-Always redraw the `pdbpp` prompt on `SIGINT` during REPL use.
-
-There was recent changes todo with Python 3.10 that required us to pin
-to a specific commit in `pdbpp` which have recently been fixed minus
-this last issue with `SIGINT` shielding: not clobbering or not
-showing the `(Pdb++)` prompt on ctlr-c by the user. This repairs all
-that by firstly removing the standard KBI intercepting of the std lib's
-`pdb.Pdb._cmdloop()` as well as ensuring that only the actor with REPL
-control ever reports `SIGINT` handler log msgs and prompt redraws. With
-this we move back to using pypi `pdbpp` release.

nooz/356.trivial.rst

@@ -1,7 +0,0 @@
-Drop `trio.Process.aclose()` usage, copy into our spawning code.
-
-The details are laid out in https://github.com/goodboy/tractor/issues/330.
-`trio` changed is process running quite some time ago, this just copies
-out the small bit we needed (from the old `.aclose()`) for hard kills
-where a soft runtime cancel request fails and our "zombie killer"
-implementation kicks in.

nooz/358.feature.rst

@@ -1,15 +0,0 @@
-Switch to using the fork & fix of `pdb++`, `pdbp`:
-https://github.com/mdmintz/pdbp
-
-Allows us to sidestep a variety of issues that aren't being maintained
-in the upstream project thanks to the hard work of @mdmintz!
-
-We also include some default settings adjustments as per recent
-development on the fork:
-
-- sticky mode is still turned on by default but now activates when
-  a using the `ll` repl command.
-- turn off line truncation by default to avoid inter-line gaps when
-  resizing the terimnal during use.
-- when using the backtrace cmd either by `w` or `bt`, the config
-  automatically switches to non-sticky mode.

pyproject.toml

@@ -1,28 +0,0 @@
-[tool.towncrier]
-package = "tractor"
-filename = "NEWS.rst"
-directory = "nooz/"
-version = "0.1.0a6"
-title_format = "tractor {version} ({project_date})"
-template = "nooz/_template.rst"
-all_bullets = true
-
-  [[tool.towncrier.type]]
-  directory = "feature"
-  name = "Features"
-  showcontent = true
-
-  [[tool.towncrier.type]]
-  directory = "bugfix"
-  name = "Bug Fixes"
-  showcontent = true
-
-  [[tool.towncrier.type]]
-  directory = "doc"
-  name = "Improved Documentation"
-  showcontent = true
-
-  [[tool.towncrier.type]]
-  directory = "trivial"
-  name = "Trivial/Internal Changes"
-  showcontent = true

requirements-test.txt

@@ -1,8 +1,7 @@
 pytest
 pytest-trio
-pytest-timeout
-pdbp
-mypy
-trio_typing
+pdbpp
+mypy<0.920
+trio_typing<0.7.0
 pexpect
 towncrier

setup.py

@@ -1,22 +1,21 @@
 #!/usr/bin/env python
 #
-# tractor: structured concurrent "actors".
+# tractor: a trionic actor model built on `multiprocessing` and `trio`
 #
-# Copyright 2018-eternity Tyler Goodlet.
+# Copyright (C) 2018-2020  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
+# it under the terms of the GNU 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/>.
+# GNU General Public License for more details.
 
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 from setuptools import setup
 
 with open('docs/README.rst', encoding='utf-8') as f:
@@ -25,62 +24,54 @@ with open('docs/README.rst', encoding='utf-8') as f:
 
 setup(
     name="tractor",
-    version='0.1.0a6dev0',  # alpha zone
-    description='structured concurrrent `trio`-"actors"',
+    version='0.1.0a5.dev',  # alpha zone
+    description='structured concurrrent "actors"',
     long_description=readme,
-    license='AGPLv3',
+    license='GPLv3',
     author='Tyler Goodlet',
     maintainer='Tyler Goodlet',
-    maintainer_email='goodboy_foss@protonmail.com',
+    maintainer_email='jgbt@protonmail.com',
     url='https://github.com/goodboy/tractor',
     platforms=['linux', 'windows'],
     packages=[
         'tractor',
-        'tractor.experimental',
         'tractor.trionics',
+        'tractor.testing',
     ],
     install_requires=[
 
         # trio related
-        # proper range spec:
-        # https://packaging.python.org/en/latest/discussions/install-requires-vs-requirements/#id5
-        'trio >= 0.22',
+        'trio>0.8',
         'async_generator',
         'trio_typing',
-        'exceptiongroup',
 
         # tooling
         'tricycle',
         'trio_typing',
+
+        # tooling
         'colorlog',
         'wrapt',
+        'pdbpp',
 
-        # IPC serialization
-        'msgspec',
-
-        # debug mode REPL
-        'pdbp',
-
-        # 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"',
+        # serialization
+        'msgpack',
 
     ],
+    extras_require={
+
+        # serialization
+        'msgspec': ["msgspec >= 0.3.2'; python_version >= '3.9'"],
+
+    },
     tests_require=['pytest'],
-    python_requires=">=3.10",
+    python_requires=">=3.9",
     keywords=[
         'trio',
-        'async',
-        'concurrency',
-        'structured concurrency',
-        'actor model',
-        'distributed',
+        "async",
+        "concurrency",
+        "actor model",
+        "distributed",
         'multiprocessing'
     ],
     classifiers=[
@@ -88,10 +79,11 @@ setup(
         "Operating System :: POSIX :: Linux",
         "Operating System :: Microsoft :: Windows",
         "Framework :: Trio",
-        "License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)",
+        "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: 3 :: Only",
-        "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Intended Audience :: Science/Research",
         "Intended Audience :: Developers",
         "Topic :: System :: Distributed Computing",

tests/conftest.py

@@ -7,91 +7,16 @@ 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
 
+# export for tests
+from tractor.testing import tractor_test  # noqa
+
+
 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)
 
 
@@ -114,21 +39,14 @@ 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 repodir():
+    """Return the abspath to the repo directory.
+    """
+    dirname = os.path.dirname
+    dirpath = os.path.abspath(
+        dirname(dirname(os.path.realpath(__file__)))
+        )
+    return dirpath
 
 
 def pytest_addoption(parser):
@@ -146,7 +64,11 @@ def pytest_addoption(parser):
 
 def pytest_configure(config):
     backend = config.option.spawn_backend
-    tractor._spawn.try_set_start_method(backend)
+
+    if backend == 'mp':
+        tractor._spawn.try_set_start_method('spawn')
+    elif backend == 'trio':
+        tractor._spawn.try_set_start_method(backend)
 
 
 @pytest.fixture(scope='session', autouse=True)
@@ -159,18 +81,15 @@ def loglevel(request):
 
 
 @pytest.fixture(scope='session')
-def spawn_backend(request) -> str:
+def spawn_backend(request):
     return request.config.option.spawn_backend
 
 
-_ci_env: bool = os.environ.get('CI', False)
-
-
 @pytest.fixture(scope='session')
 def ci_env() -> bool:
     """Detect CI envoirment.
     """
-    return _ci_env
+    return os.environ.get('TRAVIS', False) or os.environ.get('CI', False)
 
 
 @pytest.fixture(scope='session')
@@ -180,24 +99,24 @@ def arb_addr():
 
 def pytest_generate_tests(metafunc):
     spawn_backend = metafunc.config.option.spawn_backend
-
     if not spawn_backend:
         # XXX some weird windows bug with `pytest`?
-        spawn_backend = 'trio'
+        spawn_backend = 'mp'
+    assert spawn_backend in ('mp', 'trio')
 
-    # TODO: maybe just use the literal `._spawn.SpawnMethodKey`?
-    assert spawn_backend in (
-        'mp_spawn',
-        'mp_forkserver',
-        'trio',
-    )
-
-    # NOTE: used to be used to dyanmically parametrize tests for when
-    # you just passed --spawn-backend=`mp` on the cli, but now we expect
-    # that cli input to be manually specified, BUT, maybe we'll do
-    # something like this again in the future?
     if 'start_method' in metafunc.fixturenames:
-        metafunc.parametrize("start_method", [spawn_backend], scope='module')
+        if spawn_backend == 'mp':
+            from multiprocessing import get_all_start_methods
+            methods = get_all_start_methods()
+            if 'fork' in methods:
+                # fork not available on windows, so check before
+                # removing XXX: the fork method is in general
+                # incompatible with trio's global scheduler state
+                methods.remove('fork')
+        elif spawn_backend == 'trio':
+            methods = ['trio']
+
+        metafunc.parametrize("start_method", methods, scope='module')
 
 
 def sig_prog(proc, sig):
@@ -213,22 +132,16 @@ def sig_prog(proc, sig):
 
 
 @pytest.fixture
-def daemon(
-    loglevel: str,
-    testdir,
-    arb_addr: tuple[str, int],
-):
-    '''
-    Run a daemon actor as a "remote arbiter".
-
-    '''
+def daemon(loglevel, testdir, arb_addr):
+    """Run a daemon actor as a "remote arbiter".
+    """
     if loglevel in ('trace', 'debug'):
         # too much logging will lock up the subproc (smh)
         loglevel = 'info'
 
     cmdargs = [
         sys.executable, '-c',
-        "import tractor; tractor.run_daemon([], registry_addr={}, loglevel={})"
+        "import tractor; tractor.run_daemon([], arbiter_addr={}, loglevel={})"
         .format(
             arb_addr,
             "'{}'".format(loglevel) if loglevel else None)

tests/test_advanced_faults.py

@@ -1,193 +0,0 @@
-'''
-Sketchy network blackoutz, ugly byzantine gens, puedes eschuchar la
-cancelacion?..
-
-'''
-from functools import partial
-
-import pytest
-from _pytest.pathlib import import_path
-import trio
-import tractor
-
-from conftest import (
-    examples_dir,
-)
-
-
-@pytest.mark.parametrize(
-    'debug_mode',
-    [False, True],
-    ids=['no_debug_mode', 'debug_mode'],
-)
-@pytest.mark.parametrize(
-    'ipc_break',
-    [
-        # no breaks
-        {
-            'break_parent_ipc_after': False,
-            'break_child_ipc_after': False,
-        },
-
-        # only parent breaks
-        {
-            'break_parent_ipc_after': 500,
-            'break_child_ipc_after': False,
-        },
-
-        # only child breaks
-        {
-            'break_parent_ipc_after': False,
-            'break_child_ipc_after': 500,
-        },
-
-        # both: break parent first
-        {
-            'break_parent_ipc_after': 500,
-            'break_child_ipc_after': 800,
-        },
-        # both: break child first
-        {
-            'break_parent_ipc_after': 800,
-            'break_child_ipc_after': 500,
-        },
-
-    ],
-    ids=[
-        'no_break',
-        'break_parent',
-        'break_child',
-        'break_both_parent_first',
-        'break_both_child_first',
-    ],
-)
-def test_ipc_channel_break_during_stream(
-    debug_mode: bool,
-    spawn_backend: str,
-    ipc_break: dict | None,
-):
-    '''
-    Ensure we can have an IPC channel break its connection during
-    streaming and it's still possible for the (simulated) user to kill
-    the actor tree using SIGINT.
-
-    We also verify the type of connection error expected in the parent
-    depending on which side if the IPC breaks first.
-
-    '''
-    if spawn_backend != 'trio':
-        if debug_mode:
-            pytest.skip('`debug_mode` only supported on `trio` spawner')
-
-        # non-`trio` spawners should never hit the hang condition that
-        # requires the user to do ctl-c to cancel the actor tree.
-        expect_final_exc = trio.ClosedResourceError
-
-    mod = import_path(
-        examples_dir() / 'advanced_faults' / 'ipc_failure_during_stream.py',
-        root=examples_dir(),
-    )
-
-    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 child breaks
-        (
-            ipc_break['break_child_ipc_after']
-            and ipc_break['break_parent_ipc_after'] is False
-        )
-
-        # both break but, parent breaks first
-        or (
-            ipc_break['break_child_ipc_after'] is not False
-            and (
-                ipc_break['break_parent_ipc_after']
-                > ipc_break['break_child_ipc_after']
-            )
-        )
-
-    ):
-        expect_final_exc = trio.ClosedResourceError
-
-    # when the parent IPC side dies (even if the child's does as well
-    # but the child fails BEFORE the parent) we expect the channel to be
-    # sent a stop msg from the child at some point which will signal the
-    # parent that the stream has been terminated.
-    # NOTE: when the parent breaks "after" the child you get this same
-    # case as well, the child breaks the IPC channel with a stop msg
-    # before any closure takes place.
-    elif (
-        # only parent breaks
-        (
-            ipc_break['break_parent_ipc_after']
-            and ipc_break['break_child_ipc_after'] is False
-        )
-
-        # both break but, child breaks first
-        or (
-            ipc_break['break_parent_ipc_after'] is not False
-            and (
-                ipc_break['break_child_ipc_after']
-                > ipc_break['break_parent_ipc_after']
-            )
-        )
-    ):
-        expect_final_exc = trio.EndOfChannel
-
-    with pytest.raises(expect_final_exc):
-        trio.run(
-            partial(
-                mod.main,
-                debug_mode=debug_mode,
-                start_method=spawn_backend,
-                **ipc_break,
-            )
-        )
-
-
-@tractor.context
-async def break_ipc_after_started(
-    ctx: tractor.Context,
-) -> None:
-    await ctx.started()
-    async with ctx.open_stream() as stream:
-        await stream.aclose()
-        await trio.sleep(0.2)
-        await ctx.chan.send(None)
-        print('child broke IPC and terminating')
-
-
-def test_stream_closed_right_after_ipc_break_and_zombie_lord_engages():
-    '''
-    Verify that is a subactor's IPC goes down just after bringing up a stream
-    the parent can trigger a SIGINT and the child will be reaped out-of-IPC by
-    the localhost process supervision machinery: aka "zombie lord".
-
-    '''
-    async def main():
-        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)
-
-                    print('parent waiting on context')
-
-            print('parent exited context')
-            raise KeyboardInterrupt
-
-    with pytest.raises(KeyboardInterrupt):
-        trio.run(main)

tests/test_advanced_streaming.py

@@ -5,6 +5,7 @@ Advanced streaming patterns using bidirectional streams and contexts.
 from collections import Counter
 import itertools
 import platform
+from typing import Set, Dict, List
 
 import trio
 import tractor
@@ -14,7 +15,7 @@ def is_win():
     return platform.system() == 'Windows'
 
 
-_registry: dict[str, set[tractor.MsgStream]] = {
+_registry: Dict[str, Set[tractor.ReceiveMsgStream]] = {
     'even': set(),
     'odd': set(),
 }
@@ -76,7 +77,7 @@ async def subscribe(
 
 async def consumer(
 
-    subs: list[str],
+    subs: List[str],
 
 ) -> None:
 

tests/test_cancellation.py

@@ -8,10 +8,6 @@ import platform
 import time
 from itertools import repeat
 
-from exceptiongroup import (
-    BaseExceptionGroup,
-    ExceptionGroup,
-)
 import pytest
 import trio
 import tractor
@@ -60,49 +56,29 @@ def test_remote_error(arb_addr, args_err):
             arbiter_addr=arb_addr,
         ) as nursery:
 
-            # on a remote type error caused by bad input args
-            # this should raise directly which means we **don't** get
-            # 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
             )
 
             # get result(s) from main task
             try:
-                # this means the root actor will also raise a local
-                # parent task error and thus an eg will propagate out
-                # of this actor nursery.
                 await portal.result()
             except tractor.RemoteActorError as err:
                 assert err.type == errtype
                 print("Look Maa that actor failed hard, hehh")
                 raise
 
-    # ensure boxed errors
-    if args:
-        with pytest.raises(tractor.RemoteActorError) as excinfo:
-            trio.run(main)
+    with pytest.raises(tractor.RemoteActorError) as excinfo:
+        trio.run(main)
 
-        assert excinfo.value.type == errtype
-
-    else:
-        # the root task will also error on the `.result()` call
-        # so we expect an error from there AND the child.
-        with pytest.raises(BaseExceptionGroup) as excinfo:
-            trio.run(main)
-
-        # ensure boxed errors
-        for exc in excinfo.value.exceptions:
-            assert exc.type == errtype
+    # ensure boxed error is correct
+    assert excinfo.value.type == errtype
 
 
 def test_multierror(arb_addr):
-    '''
-    Verify we raise a ``BaseExceptionGroup`` out of a nursery where
+    """Verify we raise a ``trio.MultiError`` out of a nursery where
     more then one actor errors.
-
-    '''
+    """
     async def main():
         async with tractor.open_nursery(
             arbiter_addr=arb_addr,
@@ -119,10 +95,10 @@ def test_multierror(arb_addr):
                 print("Look Maa that first actor failed hard, hehh")
                 raise
 
-        # here we should get a ``BaseExceptionGroup`` containing exceptions
+        # here we should get a `trio.MultiError` containing exceptions
         # from both subactors
 
-    with pytest.raises(BaseExceptionGroup):
+    with pytest.raises(trio.MultiError):
         trio.run(main)
 
 
@@ -131,7 +107,7 @@ def test_multierror(arb_addr):
     'num_subactors', range(25, 26),
 )
 def test_multierror_fast_nursery(arb_addr, start_method, num_subactors, delay):
-    """Verify we raise a ``BaseExceptionGroup`` out of a nursery where
+    """Verify we raise a ``trio.MultiError`` out of a nursery where
     more then one actor errors and also with a delay before failure
     to test failure during an ongoing spawning.
     """
@@ -147,11 +123,10 @@ def test_multierror_fast_nursery(arb_addr, start_method, num_subactors, delay):
                     delay=delay
                 )
 
-    # with pytest.raises(trio.MultiError) as exc_info:
-    with pytest.raises(BaseExceptionGroup) as exc_info:
+    with pytest.raises(trio.MultiError) as exc_info:
         trio.run(main)
 
-    assert exc_info.type == ExceptionGroup
+    assert exc_info.type == tractor.MultiError
     err = exc_info.value
     exceptions = err.exceptions
 
@@ -239,8 +214,8 @@ async def test_cancel_infinite_streamer(start_method):
     [
         # daemon actors sit idle while single task actors error out
         (1, tractor.RemoteActorError, AssertionError, (assert_err, {}), None),
-        (2, BaseExceptionGroup, AssertionError, (assert_err, {}), None),
-        (3, BaseExceptionGroup, AssertionError, (assert_err, {}), None),
+        (2, tractor.MultiError, AssertionError, (assert_err, {}), None),
+        (3, tractor.MultiError, AssertionError, (assert_err, {}), None),
 
         # 1 daemon actor errors out while single task actors sleep forever
         (3, tractor.RemoteActorError, AssertionError, (sleep_forever, {}),
@@ -251,7 +226,7 @@ async def test_cancel_infinite_streamer(start_method):
          (do_nuthin, {}), (assert_err, {'delay': 1}, True)),
         # daemon complete quickly delay while single task
         # actors error after brief delay
-        (3, BaseExceptionGroup, AssertionError,
+        (3, tractor.MultiError, AssertionError,
          (assert_err, {'delay': 1}), (do_nuthin, {}, False)),
     ],
     ids=[
@@ -318,7 +293,7 @@ async def test_some_cancels_all(num_actors_and_errs, start_method, loglevel):
         # should error here with a ``RemoteActorError`` or ``MultiError``
 
     except first_err as err:
-        if isinstance(err, BaseExceptionGroup):
+        if isinstance(err, tractor.MultiError):
             assert len(err.exceptions) == num_actors
             for exc in err.exceptions:
                 if isinstance(exc, tractor.RemoteActorError):
@@ -362,7 +337,7 @@ async def spawn_and_error(breadth, depth) -> None:
 @tractor_test
 async def test_nested_multierrors(loglevel, start_method):
     '''
-    Test that failed actor sets are wrapped in `BaseExceptionGroup`s. This
+    Test that failed actor sets are wrapped in `trio.MultiError`s. This
     test goes only 2 nurseries deep but we should eventually have tests
     for arbitrary n-depth actor trees.
 
@@ -390,7 +365,7 @@ async def test_nested_multierrors(loglevel, start_method):
                         breadth=subactor_breadth,
                         depth=depth,
                     )
-        except BaseExceptionGroup as err:
+        except trio.MultiError as err:
             assert len(err.exceptions) == subactor_breadth
             for subexc in err.exceptions:
 
@@ -408,10 +383,10 @@ async def test_nested_multierrors(loglevel, start_method):
                         assert subexc.type in (
                             tractor.RemoteActorError,
                             trio.Cancelled,
-                            BaseExceptionGroup,
+                            trio.MultiError
                         )
 
-                    elif isinstance(subexc, BaseExceptionGroup):
+                    elif isinstance(subexc, trio.MultiError):
                         for subsub in subexc.exceptions:
 
                             if subsub in (tractor.RemoteActorError,):
@@ -419,7 +394,7 @@ async def test_nested_multierrors(loglevel, start_method):
 
                             assert type(subsub) in (
                                 trio.Cancelled,
-                                BaseExceptionGroup,
+                                trio.MultiError,
                             )
                 else:
                     assert isinstance(subexc, tractor.RemoteActorError)
@@ -431,13 +406,13 @@ async def test_nested_multierrors(loglevel, start_method):
                     if is_win():
                         if isinstance(subexc, tractor.RemoteActorError):
                             assert subexc.type in (
-                                BaseExceptionGroup,
+                                trio.MultiError,
                                 tractor.RemoteActorError
                             )
                         else:
-                            assert isinstance(subexc, BaseExceptionGroup)
+                            assert isinstance(subexc, trio.MultiError)
                     else:
-                        assert subexc.type is ExceptionGroup
+                        assert subexc.type is trio.MultiError
                 else:
                     assert subexc.type in (
                         tractor.RemoteActorError,
@@ -460,7 +435,7 @@ def test_cancel_via_SIGINT(
         with trio.fail_after(2):
             async with tractor.open_nursery() as tn:
                 await tn.start_actor('sucka')
-                if 'mp' in spawn_backend:
+                if spawn_backend == 'mp':
                     time.sleep(0.1)
                 os.kill(pid, signal.SIGINT)
                 await trio.sleep_forever()
@@ -499,7 +474,7 @@ def test_cancel_via_SIGINT_other_task(
         with trio.fail_after(timeout):
             async with trio.open_nursery() as n:
                 await n.start(spawn_and_sleep_forever)
-                if 'mp' in spawn_backend:
+                if spawn_backend == 'mp':
                     time.sleep(0.1)
                 os.kill(pid, signal.SIGINT)
 

tests/test_child_manages_service_nursery.py

@@ -1,173 +0,0 @@
-'''
-Test a service style daemon that maintains a nursery for spawning
-"remote async tasks" including both spawning other long living
-sub-sub-actor daemons.
-
-'''
-from typing import Optional
-import asyncio
-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(
-    from_trio: asyncio.Queue,
-    to_trio: trio.abc.SendChannel,
-) -> trio.abc.ReceiveChannel:
-
-    # required first msg to sync caller
-    to_trio.send_nowait(None)
-
-    from itertools import cycle
-    for i in cycle(range(10)):
-        to_trio.send_nowait(i)
-        await asyncio.sleep(0.01)
-
-
-async def trio_streamer():
-    from itertools import cycle
-    for i in cycle(range(10)):
-        yield i
-        await trio.sleep(0.01)
-
-
-async def trio_sleep_and_err(delay: float = 0.5):
-    await trio.sleep(delay)
-    # name error
-    doggy()  # noqa
-
-
-_cached_stream: Optional[
-    trio.abc.ReceiveChannel
-] = None
-
-
-@acm
-async def wrapper_mngr(
-):
-    from tractor.trionics import broadcast_receiver
-    global _cached_stream
-    in_aio = tractor.current_actor().is_infected_aio()
-
-    if in_aio:
-        if _cached_stream:
-
-            from_aio = _cached_stream
-
-            # if we already have a cached feed deliver a rx side clone
-            # to consumer
-            async with broadcast_receiver(from_aio, 6) as from_aio:
-                yield from_aio
-                return
-        else:
-            async with tractor.to_asyncio.open_channel_from(
-                aio_streamer,
-            ) as (first, from_aio):
-                assert not first
-
-                # cache it so next task uses broadcast receiver
-                _cached_stream = from_aio
-
-                yield from_aio
-    else:
-        async with aclosing(trio_streamer()) as stream:
-            # cache it so next task uses broadcast receiver
-            _cached_stream = stream
-            yield stream
-
-
-_nursery: trio.Nursery = None
-
-
-@tractor.context
-async def trio_main(
-    ctx: tractor.Context,
-):
-    # sync
-    await ctx.started()
-
-    # stash a "service nursery" as "actor local" (aka a Python global)
-    global _nursery
-    n = _nursery
-    assert n
-
-    async def consume_stream():
-        async with wrapper_mngr() as stream:
-            async for msg in stream:
-                print(msg)
-
-    # run 2 tasks to ensure broadcaster chan use
-    n.start_soon(consume_stream)
-    n.start_soon(consume_stream)
-
-    n.start_soon(trio_sleep_and_err)
-
-    await trio.sleep_forever()
-
-
-@tractor.context
-async def open_actor_local_nursery(
-    ctx: tractor.Context,
-):
-    global _nursery
-    async with trio.open_nursery() as n:
-        _nursery = n
-        await ctx.started()
-        await trio.sleep(10)
-        # await trio.sleep(1)
-
-        # XXX: this causes the hang since
-        # the caller does not unblock from its own
-        # ``trio.sleep_forever()``.
-
-        # TODO: we need to test a simple ctx task starting remote tasks
-        # that error and then blocking on a ``Nursery.start()`` which
-        # never yields back.. aka a scenario where the
-        # ``tractor.context`` task IS NOT in the service n's cancel
-        # scope.
-        n.cancel_scope.cancel()
-
-
-@pytest.mark.parametrize(
-    'asyncio_mode',
-    [True, False],
-    ids='asyncio_mode={}'.format,
-)
-def test_actor_managed_trio_nursery_task_error_cancels_aio(
-    asyncio_mode: bool,
-    arb_addr
-):
-    '''
-    Verify that a ``trio`` nursery created managed in a child actor
-    correctly relays errors to the parent actor when one of its spawned
-    tasks errors even when running in infected asyncio mode and using
-    broadcast receivers for multi-task-per-actor subscription.
-
-    '''
-    async def main():
-
-        # cancel the nursery shortly after boot
-        async with tractor.open_nursery() as n:
-            p = await n.start_actor(
-                'nursery_mngr',
-                infect_asyncio=asyncio_mode,
-                enable_modules=[__name__],
-            )
-            async with (
-                p.open_context(open_actor_local_nursery) as (ctx, first),
-                p.open_context(trio_main) as (ctx, first),
-            ):
-                await trio.sleep_forever()
-
-    with pytest.raises(RemoteActorError) as excinfo:
-        trio.run(main)
-
-    # verify boxed error
-    err = excinfo.value
-    assert isinstance(err.type(), NameError)

tests/test_clustering.py

@@ -1,6 +1,5 @@
 import itertools
 
-import pytest
 import trio
 import tractor
 from tractor import open_actor_cluster
@@ -12,72 +11,26 @@ from conftest import tractor_test
 MESSAGE = 'tractoring at full speed'
 
 
-def test_empty_mngrs_input_raises() -> None:
-
-    async def main():
-        with trio.fail_after(1):
-            async with (
-                open_actor_cluster(
-                    modules=[__name__],
-
-                    # NOTE: ensure we can passthrough runtime opts
-                    loglevel='info',
-                    # debug_mode=True,
-
-                ) as portals,
-
-                gather_contexts(
-                    # NOTE: it's the use of inline-generator syntax
-                    # here that causes the empty input.
-                    mngrs=(
-                        p.open_context(worker) for p in portals.values()
-                    ),
-                ),
-            ):
-                assert 0
-
-    with pytest.raises(ValueError):
-        trio.run(main)
-
-
 @tractor.context
-async def worker(
-    ctx: tractor.Context,
-
-) -> None:
-
+async def worker(ctx: tractor.Context) -> None:
     await ctx.started()
-
-    async with ctx.open_stream(
-        backpressure=True,
-    ) as stream:
-
-        # TODO: this with the below assert causes a hang bug?
-        # with trio.move_on_after(1):
-
+    async with ctx.open_stream(backpressure=True) as stream:
         async for msg in stream:
             # do something with msg
             print(msg)
             assert msg == MESSAGE
 
-        # TODO: does this ever cause a hang
-        # assert 0
-
 
 @tractor_test
 async def test_streaming_to_actor_cluster() -> None:
-
     async with (
         open_actor_cluster(modules=[__name__]) as portals,
-
         gather_contexts(
             mngrs=[p.open_context(worker) for p in portals.values()],
         ) as contexts,
-
         gather_contexts(
             mngrs=[ctx[0].open_stream() for ctx in contexts],
         ) as streams,
-
     ):
         with trio.move_on_after(1):
             for stream in itertools.cycle(streams):

tests/test_context_stream_semantics.py

@@ -265,44 +265,42 @@ async def test_callee_closes_ctx_after_stream_open():
             enable_modules=[__name__],
         )
 
-        with trio.fail_after(2):
-            async with portal.open_context(
-                close_ctx_immediately,
+        async with portal.open_context(
+            close_ctx_immediately,
 
-                # flag to avoid waiting the final result
-                # cancel_on_exit=True,
+            # flag to avoid waiting the final result
+            # cancel_on_exit=True,
 
-            ) as (ctx, sent):
+        ) as (ctx, sent):
 
-                assert sent is None
+            assert sent is None
 
-                with trio.fail_after(0.5):
-                    async with ctx.open_stream() as stream:
+            with trio.fail_after(0.5):
+                async with ctx.open_stream() as stream:
 
-                        # should fall through since ``StopAsyncIteration``
-                        # should be raised through translation of
-                        # a ``trio.EndOfChannel`` by
-                        # ``trio.abc.ReceiveChannel.__anext__()``
-                        async for _ in stream:
-                            assert 0
-                        else:
+                    # should fall through since ``StopAsyncIteration``
+                    # should be raised through translation of
+                    # a ``trio.EndOfChannel`` by
+                    # ``trio.abc.ReceiveChannel.__anext__()``
+                    async for _ in stream:
+                        assert 0
+                    else:
 
-                            # verify stream is now closed
-                            try:
-                                await stream.receive()
-                            except trio.EndOfChannel:
-                                pass
-
-                # TODO: should be just raise the closed resource err
-                # directly here to enforce not allowing a re-open
-                # of a stream to the context (at least until a time of
-                # if/when we decide that's a good idea?)
-                try:
-                    with trio.fail_after(0.5):
-                        async with ctx.open_stream() as stream:
+                        # verify stream is now closed
+                        try:
+                            await stream.receive()
+                        except trio.EndOfChannel:
                             pass
-                except trio.ClosedResourceError:
+
+            # TODO: should be just raise the closed resource err
+            # directly here to enforce not allowing a re-open
+            # of a stream to the context (at least until a time of
+            # if/when we decide that's a good idea?)
+            try:
+                async with ctx.open_stream() as stream:
                     pass
+            except trio.ClosedResourceError:
+                pass
 
         await portal.cancel_actor()
 
@@ -571,7 +569,7 @@ def test_one_end_stream_not_opened(overrun_by):
 
     '''
     overrunner, buf_size_increase, entrypoint = overrun_by
-    from tractor._runtime import Actor
+    from tractor._actor import Actor
     buf_size = buf_size_increase + Actor.msg_buffer_size
 
     async def main():

tests/test_debugger.py

@@ -1,5 +1,5 @@
 """
-That "native" debug mode better work!
+That native debug better work!
 
 All these tests can be understood (somewhat) by running the equivalent
 `examples/debugging/` scripts manually.
@@ -10,25 +10,15 @@ TODO:
     - wonder if any of it'll work on OS X?
 
 """
-import itertools
-from os import path
-from typing import Optional
-import platform
-import pathlib
-import sys
 import time
+from os import path
+import platform
 
 import pytest
 import pexpect
-from pexpect.exceptions import (
-    TIMEOUT,
-    EOF,
-)
 
-from conftest import (
-    examples_dir,
-    _ci_env,
-)
+from conftest import repodir
+
 
 # TODO: The next great debugger audit could be done by you!
 # - recurrent entry to breakpoint() from single actor *after* and an
@@ -47,31 +37,19 @@ if platform.system() == 'Windows':
     )
 
 
+def examples_dir():
+    """Return the abspath to the examples directory.
+    """
+    return path.join(repodir(), 'examples', 'debugging/')
+
+
 def mk_cmd(ex_name: str) -> str:
-    '''
-    Generate a command suitable to pass to ``pexpect.spawn()``.
-
-    '''
-    script_path: pathlib.Path = examples_dir() / 'debugging' / f'{ex_name}.py'
-    return ' '.join(['python', str(script_path)])
-
-
-# TODO: was trying to this xfail style but some weird bug i see in CI
-# that's happening at collect time.. pretty soon gonna dump actions i'm
-# thinkin...
-# in CI we skip tests which >= depth 1 actor trees due to there
-# still being an oustanding issue with relaying the debug-mode-state
-# through intermediary parents.
-has_nested_actors = pytest.mark.has_nested_actors
-# .xfail(
-#     os.environ.get('CI', False),
-#     reason=(
-#         'This test uses nested actors and fails in CI\n'
-#         'The test seems to run fine locally but until we solve the '
-#         'following issue this CI test will be xfail:\n'
-#         'https://github.com/goodboy/tractor/issues/320'
-#     )
-# )
+    """Generate a command suitable to pass to ``pexpect.spawn()``.
+    """
+    return ' '.join(
+        ['python',
+         path.join(examples_dir(), f'{ex_name}.py')]
+    )
 
 
 @pytest.fixture
@@ -95,83 +73,6 @@ def spawn(
     return _spawn
 
 
-PROMPT = r"\(Pdb\+\)"
-
-
-def expect(
-    child,
-
-    # prompt by default
-    patt: str = PROMPT,
-
-    **kwargs,
-
-) -> None:
-    '''
-    Expect wrapper that prints last seen console
-    data before failing.
-
-    '''
-    try:
-        child.expect(
-            patt,
-            **kwargs,
-        )
-    except TIMEOUT:
-        before = str(child.before.decode())
-        print(before)
-        raise
-
-
-def assert_before(
-    child,
-    patts: list[str],
-
-) -> None:
-
-    before = str(child.before.decode())
-
-    for patt in patts:
-        try:
-            assert patt in before
-        except AssertionError:
-            print(before)
-            raise
-
-
-@pytest.fixture(
-    params=[False, True],
-    ids='ctl-c={}'.format,
-)
-def ctlc(
-    request,
-    ci_env: bool,
-
-) -> bool:
-
-    use_ctlc = request.param
-
-    node = request.node
-    markers = node.own_markers
-    for mark in markers:
-        if mark.name == 'has_nested_actors':
-            pytest.skip(
-                f'Test {node} has nested actors and fails with Ctrl-C.\n'
-                f'The test can sometimes run fine locally but until'
-                ' we solve' 'this issue this CI test will be xfail:\n'
-                'https://github.com/goodboy/tractor/issues/320'
-            )
-
-    if use_ctlc:
-        # XXX: disable pygments highlighting for auto-tests
-        # since some envs (like actions CI) will struggle
-        # the the added color-char encoding..
-        from tractor._debug import TractorConfig
-        TractorConfig.use_pygements = False
-
-    yield use_ctlc
-
-
 @pytest.mark.parametrize(
     'user_in_out',
     [
@@ -181,16 +82,14 @@ def ctlc(
     ids=lambda item: f'{item[0]} -> {item[1]}',
 )
 def test_root_actor_error(spawn, user_in_out):
-    '''
-    Demonstrate crash handler entering pdb from basic error in root actor.
-
-    '''
+    """Demonstrate crash handler entering pdbpp from basic error in root actor.
+    """
     user_input, expect_err_str = user_in_out
 
     child = spawn('root_actor_error')
 
-    # scan for the prompt
-    expect(child, PROMPT)
+    # scan for the pdbpp prompt
+    child.expect(r"\(Pdb\+\+\)")
 
     before = str(child.before.decode())
 
@@ -202,7 +101,7 @@ def test_root_actor_error(spawn, user_in_out):
     child.sendline(user_input)
 
     # process should exit
-    expect(child, EOF)
+    child.expect(pexpect.EOF)
     assert expect_err_str in str(child.before)
 
 
@@ -220,8 +119,8 @@ def test_root_actor_bp(spawn, user_in_out):
     user_input, expect_err_str = user_in_out
     child = spawn('root_actor_breakpoint')
 
-    # scan for the prompt
-    child.expect(PROMPT)
+    # scan for the pdbpp prompt
+    child.expect(r"\(Pdb\+\+\)")
 
     assert 'Error' not in str(child.before)
 
@@ -238,129 +137,56 @@ def test_root_actor_bp(spawn, user_in_out):
         assert expect_err_str in str(child.before)
 
 
-def do_ctlc(
-    child,
-    count: int = 3,
-    delay: float = 0.1,
-    patt: Optional[str] = None,
-
-    # expect repl UX to reprint the prompt after every
-    # ctrl-c send.
-    # XXX: no idea but, in CI this never seems to work even on 3.10 so
-    # needs some further investigation potentially...
-    expect_prompt: bool = not _ci_env,
-
-) -> None:
-
-    # make sure ctl-c sends don't do anything but repeat output
-    for _ in range(count):
-        time.sleep(delay)
-        child.sendcontrol('c')
-
-        # TODO: figure out why this makes CI fail..
-        # if you run this test manually it works just fine..
-        if expect_prompt:
-            before = str(child.before.decode())
-            time.sleep(delay)
-            child.expect(PROMPT)
-            time.sleep(delay)
-
-            if patt:
-                # should see the last line on console
-                assert patt in before
-
-
-def test_root_actor_bp_forever(
-    spawn,
-    ctlc: bool,
-):
+def test_root_actor_bp_forever(spawn):
     "Re-enter a breakpoint from the root actor-task."
     child = spawn('root_actor_breakpoint_forever')
 
     # do some "next" commands to demonstrate recurrent breakpoint
     # entries
     for _ in range(10):
-
-        child.expect(PROMPT)
-
-        if ctlc:
-            do_ctlc(child)
-
         child.sendline('next')
+        child.expect(r"\(Pdb\+\+\)")
 
-    # do one continue which should trigger a
-    # new task to lock the tty
+    # do one continue which should trigger a new task to lock the tty
     child.sendline('continue')
-    child.expect(PROMPT)
-
-    # seems that if we hit ctrl-c too fast the
-    # sigint guard machinery might not kick in..
-    time.sleep(0.001)
-
-    if ctlc:
-        do_ctlc(child)
+    child.expect(r"\(Pdb\+\+\)")
 
     # XXX: this previously caused a bug!
     child.sendline('n')
-    child.expect(PROMPT)
+    child.expect(r"\(Pdb\+\+\)")
 
     child.sendline('n')
-    child.expect(PROMPT)
-
-    # quit out of the loop
-    child.sendline('q')
-    child.expect(pexpect.EOF)
+    child.expect(r"\(Pdb\+\+\)")
 
 
-@pytest.mark.parametrize(
-    'do_next',
-    (True, False),
-    ids='do_next={}'.format,
-)
-def test_subactor_error(
-    spawn,
-    ctlc: bool,
-    do_next: bool,
-):
-    '''
-    Single subactor raising an error
+def test_subactor_error(spawn):
+    "Single subactor raising an error"
 
-    '''
     child = spawn('subactor_error')
 
-    # scan for the prompt
-    child.expect(PROMPT)
+    # scan for the pdbpp prompt
+    child.expect(r"\(Pdb\+\+\)")
 
     before = str(child.before.decode())
     assert "Attaching to pdb in crashed actor: ('name_error'" in before
 
-    if do_next:
-        child.sendline('n')
+    # send user command
+    # (in this case it's the same for 'continue' vs. 'quit')
+    child.sendline('continue')
 
-    else:
-        # make sure ctl-c sends don't do anything but repeat output
-        if ctlc:
-            do_ctlc(
-                child,
-            )
+    # the debugger should enter a second time in the nursery
+    # creating actor
 
-        # send user command and (in this case it's the same for 'continue'
-        # vs. 'quit') the debugger should enter a second time in the nursery
-        # creating actor
-        child.sendline('continue')
+    child.expect(r"\(Pdb\+\+\)")
 
-    child.expect(PROMPT)
     before = str(child.before.decode())
 
     # root actor gets debugger engaged
     assert "Attaching to pdb in crashed actor: ('root'" in before
+
     # error is a remote error propagated from the subactor
     assert "RemoteActorError: ('name_error'" in before
 
-    # another round
-    if ctlc:
-        do_ctlc(child)
-
     child.sendline('c')
     child.expect('\r\n')
 
@@ -368,16 +194,13 @@ def test_subactor_error(
     child.expect(pexpect.EOF)
 
 
-def test_subactor_breakpoint(
-    spawn,
-    ctlc: bool,
-):
+def test_subactor_breakpoint(spawn):
     "Single subactor with an infinite breakpoint loop"
 
     child = spawn('subactor_breakpoint')
 
-    # scan for the prompt
-    child.expect(PROMPT)
+    # scan for the pdbpp prompt
+    child.expect(r"\(Pdb\+\+\)")
 
     before = str(child.before.decode())
     assert "Attaching pdb to actor: ('breakpoint_forever'" in before
@@ -386,34 +209,25 @@ def test_subactor_breakpoint(
     # entries
     for _ in range(10):
         child.sendline('next')
-        child.expect(PROMPT)
-
-        if ctlc:
-            do_ctlc(child)
+        child.expect(r"\(Pdb\+\+\)")
 
     # now run some "continues" to show re-entries
     for _ in range(5):
         child.sendline('continue')
-        child.expect(PROMPT)
+        child.expect(r"\(Pdb\+\+\)")
         before = str(child.before.decode())
         assert "Attaching pdb to actor: ('breakpoint_forever'" in before
 
-        if ctlc:
-            do_ctlc(child)
-
     # finally quit the loop
     child.sendline('q')
 
     # child process should exit but parent will capture pdb.BdbQuit
-    child.expect(PROMPT)
+    child.expect(r"\(Pdb\+\+\)")
 
     before = str(child.before.decode())
     assert "RemoteActorError: ('breakpoint_forever'" in before
     assert 'bdb.BdbQuit' in before
 
-    if ctlc:
-        do_ctlc(child)
-
     # quit the parent
     child.sendline('c')
 
@@ -425,159 +239,110 @@ def test_subactor_breakpoint(
     assert 'bdb.BdbQuit' in before
 
 
-@has_nested_actors
-def test_multi_subactors(
-    spawn,
-    ctlc: bool,
-):
-    '''
-    Multiple subactors, both erroring and
-    breakpointing as well as a nested subactor erroring.
-
-    '''
+def test_multi_subactors(spawn):
+    """
+    Multiple subactors, both erroring and breakpointing as well as
+    a nested subactor erroring.
+    """
     child = spawn(r'multi_subactors')
 
-    # scan for the prompt
-    child.expect(PROMPT)
+    # scan for the pdbpp prompt
+    child.expect(r"\(Pdb\+\+\)")
 
     before = str(child.before.decode())
     assert "Attaching pdb to actor: ('breakpoint_forever'" in before
 
-    if ctlc:
-        do_ctlc(child)
-
     # do some "next" commands to demonstrate recurrent breakpoint
     # entries
     for _ in range(10):
         child.sendline('next')
-        child.expect(PROMPT)
-
-        if ctlc:
-            do_ctlc(child)
+        child.expect(r"\(Pdb\+\+\)")
 
     # continue to next error
     child.sendline('c')
 
     # first name_error failure
-    child.expect(PROMPT)
+    child.expect(r"\(Pdb\+\+\)")
     before = str(child.before.decode())
     assert "Attaching to pdb in crashed actor: ('name_error'" in before
     assert "NameError" in before
 
-    if ctlc:
-        do_ctlc(child)
-
     # continue again
     child.sendline('c')
 
     # 2nd name_error failure
-    child.expect(PROMPT)
-
-    # TODO: will we ever get the race where this crash will show up?
-    # blocklist strat now prevents this crash
-    # assert_before(child, [
-    #     "Attaching to pdb in crashed actor: ('name_error_1'",
-    #     "NameError",
-    # ])
-
-    if ctlc:
-        do_ctlc(child)
+    child.expect(r"\(Pdb\+\+\)")
+    before = str(child.before.decode())
+    assert "Attaching to pdb in crashed actor: ('name_error_1'" in before
+    assert "NameError" in before
 
     # breakpoint loop should re-engage
     child.sendline('c')
-    child.expect(PROMPT)
+    child.expect(r"\(Pdb\+\+\)")
     before = str(child.before.decode())
     assert "Attaching pdb to actor: ('breakpoint_forever'" in before
 
-    if ctlc:
-        do_ctlc(child)
-
     # wait for spawn error to show up
     spawn_err = "Attaching to pdb in crashed actor: ('spawn_error'"
-    start = time.time()
-    while (
-        spawn_err not in before
-        and (time.time() - start) < 3  # timeout eventually
-    ):
+    while spawn_err not in before:
         child.sendline('c')
         time.sleep(0.1)
-        child.expect(PROMPT)
+        child.expect(r"\(Pdb\+\+\)")
         before = str(child.before.decode())
 
-        if ctlc:
-            do_ctlc(child)
-
     # 2nd depth nursery should trigger
-    # (XXX: this below if guard is technically a hack that makes the
-    # nested case seem to work locally on linux but ideally in the long
-    # run this can be dropped.)
-    if not ctlc:
-        assert_before(child, [
-            spawn_err,
-            "RemoteActorError: ('name_error_1'",
-        ])
+    # child.sendline('c')
+    # child.expect(r"\(Pdb\+\+\)")
+    # before = str(child.before.decode())
+    assert spawn_err in before
+    assert "RemoteActorError: ('name_error_1'" in before
 
     # now run some "continues" to show re-entries
     for _ in range(5):
         child.sendline('c')
-        child.expect(PROMPT)
+        child.expect(r"\(Pdb\+\+\)")
 
     # quit the loop and expect parent to attach
     child.sendline('q')
-    child.expect(PROMPT)
+    child.expect(r"\(Pdb\+\+\)")
     before = str(child.before.decode())
-
-    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',
-    ])
-
-    if ctlc:
-        do_ctlc(child)
+    # debugger attaches to root
+    assert "Attaching to pdb in crashed actor: ('root'" in before
+    # expect a multierror with exceptions for each sub-actor
+    assert "RemoteActorError: ('breakpoint_forever'" in before
+    assert "RemoteActorError: ('name_error'" in before
+    assert "RemoteActorError: ('spawn_error'" in before
+    assert "RemoteActorError: ('name_error_1'" in before
+    assert 'bdb.BdbQuit' in before
 
     # process should exit
     child.sendline('c')
     child.expect(pexpect.EOF)
-
     # repeat of previous multierror for final output
-    assert_before(child, [
-        "RemoteActorError: ('breakpoint_forever'",
-        "RemoteActorError: ('name_error'",
-        "RemoteActorError: ('spawn_error'",
-        "RemoteActorError: ('name_error_1'",
-        'bdb.BdbQuit',
-    ])
+    before = str(child.before.decode())
+    assert "RemoteActorError: ('breakpoint_forever'" in before
+    assert "RemoteActorError: ('name_error'" in before
+    assert "RemoteActorError: ('spawn_error'" in before
+    assert "RemoteActorError: ('name_error_1'" in before
+    assert 'bdb.BdbQuit' in before
 
 
-def test_multi_daemon_subactors(
-    spawn,
-    loglevel: str,
-    ctlc: bool
-):
-    '''
-    Multiple daemon subactors, both erroring and breakpointing within a
+def test_multi_daemon_subactors(spawn, loglevel):
+    """Multiple daemon subactors, both erroring and breakpointing within a
     stream.
-
-    '''
+    """
     child = spawn('multi_daemon_subactors')
 
-    child.expect(PROMPT)
+    child.expect(r"\(Pdb\+\+\)")
 
-    # there can be a race for which subactor will acquire
-    # the root's tty lock first so anticipate either crash
-    # message on the first entry.
-
-    bp_forever_msg = "Attaching pdb to actor: ('bp_forever'"
-    name_error_msg = "NameError: name 'doggypants' is not defined"
+    # there is a race for which subactor will acquire
+    # the root's tty lock first
 
     before = str(child.before.decode())
+
+    bp_forever_msg = "Attaching pdb to actor: ('bp_forever'"
+    name_error_msg = "NameError"
+
     if bp_forever_msg in before:
         next_msg = name_error_msg
 
@@ -587,9 +352,6 @@ def test_multi_daemon_subactors(
     else:
         raise ValueError("Neither log msg was found !?")
 
-    if ctlc:
-        do_ctlc(child)
-
     # NOTE: previously since we did not have clobber prevention
     # in the root actor this final resume could result in the debugger
     # tearing down since both child actors would be cancelled and it was
@@ -598,8 +360,10 @@ def test_multi_daemon_subactors(
     # second entry by `bp_forever`.
 
     child.sendline('c')
-    child.expect(PROMPT)
-    assert_before(child, [next_msg])
+    child.expect(r"\(Pdb\+\+\)")
+    before = str(child.before.decode())
+
+    assert next_msg in before
 
     # XXX: hooray the root clobbering the child here was fixed!
     # IMO, this demonstrates the true power of SC system design.
@@ -607,7 +371,7 @@ 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
-    # ``_debug.Lock.no_remote_has_tty`` event before sending cancel messages
+    # ``_debug._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
@@ -615,61 +379,32 @@ def test_multi_daemon_subactors(
     # it seems unreliable in testing here to gnab it:
     # assert "in use by child ('bp_forever'," in before
 
-    if ctlc:
-        do_ctlc(child)
-
-    # expect another breakpoint actor entry
-    child.sendline('c')
-    child.expect(PROMPT)
-
-    try:
-        assert_before(child, [bp_forever_msg])
-    except AssertionError:
-        assert_before(child, [name_error_msg])
-
-    else:
-        if ctlc:
-            do_ctlc(child)
-
-        # should crash with the 2nd name error (simulates
-        # a retry) and then the root eventually (boxed) errors
-        # after 1 or more further bp actor entries.
+    # wait for final error in root
+    while True:
 
         child.sendline('c')
-        child.expect(PROMPT)
-        assert_before(child, [name_error_msg])
-
-    # wait for final error in root
-    # where it crashs with boxed error
-    while True:
+        child.expect(r"\(Pdb\+\+\)")
+        before = str(child.before.decode())
         try:
-            child.sendline('c')
-            child.expect(PROMPT)
-            assert_before(
-                child,
-                [bp_forever_msg]
-            )
-        except AssertionError:
+
+            # root error should be packed as remote error
+            assert "_exceptions.RemoteActorError: ('name_error'" in before
             break
 
-    assert_before(
-        child,
-        [
-            # boxed error raised in root task
-            "Attaching to pdb in crashed actor: ('root'",
-            "_exceptions.RemoteActorError: ('name_error'",
-        ]
-    )
+        except AssertionError:
+            assert bp_forever_msg in before
 
-    child.sendline('c')
-    child.expect(pexpect.EOF)
+    try:
+        child.sendline('c')
+        child.expect(pexpect.EOF)
+
+    except pexpect.exceptions.TIMEOUT:
+        # Failed to exit using continue..?
+        child.sendline('q')
+        child.expect(pexpect.EOF)
 
 
-@has_nested_actors
-def test_multi_subactors_root_errors(
-    spawn,
-    ctlc: bool
-):
+def test_multi_subactors_root_errors(spawn):
     '''
     Multiple subactors, both erroring and breakpointing as well as
     a nested subactor erroring.
@@ -677,87 +412,50 @@ def test_multi_subactors_root_errors(
     '''
     child = spawn('multi_subactor_root_errors')
 
-    # scan for the prompt
-    child.expect(PROMPT)
+    # scan for the pdbpp prompt
+    child.expect(r"\(Pdb\+\+\)")
 
     # at most one subactor should attach before the root is cancelled
     before = str(child.before.decode())
     assert "NameError: name 'doggypants' is not defined" in before
 
-    if ctlc:
-        do_ctlc(child)
-
     # continue again to catch 2nd name error from
     # actor 'name_error_1' (which is 2nd depth).
     child.sendline('c')
-
-    # due to block list strat from #337, this will no longer
-    # propagate before the root errors and cancels the spawner sub-tree.
-    child.expect(PROMPT)
-
-    # only if the blocking condition doesn't kick in fast enough
+    child.expect(r"\(Pdb\+\+\)")
     before = str(child.before.decode())
-    if "Debug lock blocked for ['name_error_1'" not in before:
+    assert "Attaching to pdb in crashed actor: ('name_error_1'" in before
+    assert "NameError" in before
 
-        assert_before(child, [
-            "Attaching to pdb in crashed actor: ('name_error_1'",
-            "NameError",
-        ])
-
-        if ctlc:
-            do_ctlc(child)
-
-        child.sendline('c')
-        child.expect(PROMPT)
-
-    # check if the spawner crashed or was blocked from debug
-    # and if this intermediary attached check the boxed error
+    child.sendline('c')
+    child.expect(r"\(Pdb\+\+\)")
     before = str(child.before.decode())
-    if "Attaching to pdb in crashed actor: ('spawn_error'" in before:
+    assert "Attaching to pdb in crashed actor: ('spawn_error'" in before
+    # boxed error from previous step
+    assert "RemoteActorError: ('name_error_1'" in before
+    assert "NameError" in before
 
-        assert_before(child, [
-            # boxed error from spawner's child
-            "RemoteActorError: ('name_error_1'",
-            "NameError",
-        ])
+    child.sendline('c')
+    child.expect(r"\(Pdb\+\+\)")
+    before = str(child.before.decode())
+    assert "Attaching to pdb in crashed actor: ('root'" in before
+    # boxed error from first level failure
+    assert "RemoteActorError: ('name_error'" in before
+    assert "NameError" in before
 
-        if ctlc:
-            do_ctlc(child)
-
-        child.sendline('c')
-        child.expect(PROMPT)
-
-    # expect a root actor crash
-    assert_before(child, [
-        "RemoteActorError: ('name_error'",
-        "NameError",
-
-        # error from root actor and root task that created top level nursery
-        "Attaching to pdb in crashed actor: ('root'",
-        "AssertionError",
-    ])
+    # warnings assert we probably don't need
+    # assert "Cancelling nursery in ('spawn_error'," in before
 
+    # continue again
     child.sendline('c')
     child.expect(pexpect.EOF)
 
-    assert_before(child, [
-        # "Attaching to pdb in crashed actor: ('root'",
-        # boxed error from previous step
-        "RemoteActorError: ('name_error'",
-        "NameError",
-        "AssertionError",
-        'assert 0',
-    ])
+    before = str(child.before.decode())
+    # error from root actor and root task that created top level nursery
+    assert "AssertionError" in before
 
 
-@has_nested_actors
-def test_multi_nested_subactors_error_through_nurseries(
-    spawn,
-
-    # TODO: address debugger issue for nested tree:
-    # https://github.com/goodboy/tractor/issues/320
-    # ctlc: bool,
-):
+def test_multi_nested_subactors_error_through_nurseries(spawn):
     """Verify deeply nested actors that error trigger debugger entries
     at each actor nurserly (level) all the way up the tree.
 
@@ -772,70 +470,55 @@ def test_multi_nested_subactors_error_through_nurseries(
 
     timed_out_early: bool = False
 
-    for send_char in itertools.cycle(['c', 'q']):
+    for i in range(12):
         try:
-            child.expect(PROMPT)
-            child.sendline(send_char)
-            time.sleep(0.01)
+            child.expect(r"\(Pdb\+\+\)")
+            child.sendline('c')
+            time.sleep(0.1)
 
-        except EOF:
+        except pexpect.exceptions.EOF:
+
+            # race conditions on how fast the continue is sent?
+            print(f"Failed early on {i}?")
+            timed_out_early = True
             break
+    else:
+        child.expect(pexpect.EOF)
 
-    assert_before(child, [
-
-        # boxed source errors
-        "NameError: name 'doggypants' is not defined",
-        "tractor._exceptions.RemoteActorError: ('name_error'",
-        "bdb.BdbQuit",
-
-        # first level subtrees
-        "tractor._exceptions.RemoteActorError: ('spawner0'",
-        # "tractor._exceptions.RemoteActorError: ('spawner1'",
-
-        # propagation of errors up through nested subtrees
-        "tractor._exceptions.RemoteActorError: ('spawn_until_0'",
-        "tractor._exceptions.RemoteActorError: ('spawn_until_1'",
-        "tractor._exceptions.RemoteActorError: ('spawn_until_2'",
-    ])
+    if not timed_out_early:
+        before = str(child.before.decode())
+        assert "NameError" in before
 
 
-@pytest.mark.timeout(15)
-@has_nested_actors
 def test_root_nursery_cancels_before_child_releases_tty_lock(
     spawn,
-    start_method,
-    ctlc: bool,
+    start_method
 ):
-    '''
-    Test that when the root sends a cancel message before a nested child
-    has unblocked (which can happen when it has the tty lock and is
-    engaged in pdb) it is indeed cancelled after exiting the debugger.
-
-    '''
+    """Test that when the root sends a cancel message before a nested
+    child has unblocked (which can happen when it has the tty lock and
+    is engaged in pdb) it is indeed cancelled after exiting the debugger.
+    """
     timed_out_early = False
 
     child = spawn('root_cancelled_but_child_is_in_tty_lock')
 
-    child.expect(PROMPT)
+    child.expect(r"\(Pdb\+\+\)")
 
     before = str(child.before.decode())
     assert "NameError: name 'doggypants' is not defined" in before
     assert "tractor._exceptions.RemoteActorError: ('name_error'" not in before
     time.sleep(0.5)
 
-    if ctlc:
-        do_ctlc(child)
-
     child.sendline('c')
 
     for i in range(4):
         time.sleep(0.5)
         try:
-            child.expect(PROMPT)
+            child.expect(r"\(Pdb\+\+\)")
 
         except (
-            EOF,
-            TIMEOUT,
+            pexpect.exceptions.EOF,
+            pexpect.exceptions.TIMEOUT,
         ):
             # races all over..
 
@@ -850,37 +533,26 @@ def test_root_nursery_cancels_before_child_releases_tty_lock(
         before = str(child.before.decode())
         assert "NameError: name 'doggypants' is not defined" in before
 
-        if ctlc:
-            do_ctlc(child)
-
         child.sendline('c')
-        time.sleep(0.1)
 
-    for i in range(3):
+    while True:
         try:
-            child.expect(pexpect.EOF, timeout=0.5)
+            child.expect(pexpect.EOF)
             break
-        except TIMEOUT:
+        except pexpect.exceptions.TIMEOUT:
             child.sendline('c')
-            time.sleep(0.1)
             print('child was able to grab tty lock again?')
-    else:
-        print('giving up on child releasing, sending `quit` cmd')
-        child.sendline('q')
-        expect(child, EOF)
 
     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 "tractor._exceptions.RemoteActorError: ('spawner0'" in before
+        assert "tractor._exceptions.RemoteActorError: ('name_error'" in before
+        assert "NameError: name 'doggypants' is not defined" in before
 
 
 def test_root_cancels_child_context_during_startup(
     spawn,
-    ctlc: bool,
 ):
     '''Verify a fast fail in the root doesn't lock up the child reaping
     and all while using the new context api.
@@ -888,33 +560,26 @@ def test_root_cancels_child_context_during_startup(
     '''
     child = spawn('fast_error_in_root_after_spawn')
 
-    child.expect(PROMPT)
+    child.expect(r"\(Pdb\+\+\)")
 
     before = str(child.before.decode())
     assert "AssertionError" in before
 
-    if ctlc:
-        do_ctlc(child)
-
     child.sendline('c')
     child.expect(pexpect.EOF)
 
 
 def test_different_debug_mode_per_actor(
     spawn,
-    ctlc: bool,
 ):
     child = spawn('per_actor_debug')
-    child.expect(PROMPT)
+    child.expect(r"\(Pdb\+\+\)")
 
     # only one actor should enter the debugger
     before = str(child.before.decode())
     assert "Attaching to pdb in crashed actor: ('debugged_boi'" in before
     assert "RuntimeError" in before
 
-    if ctlc:
-        do_ctlc(child)
-
     child.sendline('c')
     child.expect(pexpect.EOF)
 

tests/test_discovery.py

@@ -116,26 +116,11 @@ async def stream_from(portal):
             print(value)
 
 
-async def unpack_reg(actor_or_portal):
-    '''
-    Get and unpack a "registry" RPC request from the "arbiter" registry
-    system.
-
-    '''
-    if getattr(actor_or_portal, 'get_registry', None):
-        msg = await actor_or_portal.get_registry()
-    else:
-        msg = await actor_or_portal.run_from_ns('self', 'get_registry')
-
-    return {tuple(key.split('.')): val for key, val in msg.items()}
-
-
 async def spawn_and_check_registry(
     arb_addr: tuple,
     use_signal: bool,
     remote_arbiter: bool = False,
     with_streaming: bool = False,
-
 ) -> None:
 
     async with tractor.open_root_actor(
@@ -149,11 +134,13 @@ async def spawn_and_check_registry(
                 assert not actor.is_arbiter
 
             if actor.is_arbiter:
-                extra = 1  # arbiter is local root actor
-                get_reg = partial(unpack_reg, actor)
 
+                async def get_reg():
+                    return await actor.get_registry()
+
+                extra = 1  # arbiter is local root actor
             else:
-                get_reg = partial(unpack_reg, portal)
+                get_reg = partial(portal.run_from_ns, 'self', 'get_registry')
                 extra = 2  # local root actor + remote arbiter
 
             # ensure current actor is registered
@@ -279,7 +266,7 @@ async def close_chans_before_nursery(
     ):
         async with tractor.get_arbiter(*arb_addr) as aportal:
             try:
-                get_reg = partial(unpack_reg, aportal)
+                get_reg = partial(aportal.run_from_ns, 'self', 'get_registry')
 
                 async with tractor.open_nursery() as tn:
                     portal1 = await tn.start_actor(

tests/test_docs_examples.py

@@ -12,17 +12,17 @@ import shutil
 
 import pytest
 
-from conftest import (
-    examples_dir,
-)
+from conftest import repodir
+
+
+def examples_dir():
+    """Return the abspath to the examples directory.
+    """
+    return os.path.join(repodir(), 'examples')
 
 
 @pytest.fixture
-def run_example_in_subproc(
-    loglevel: str,
-    testdir,
-    arb_addr: tuple[str, int],
-):
+def run_example_in_subproc(loglevel, testdir, arb_addr):
 
     @contextmanager
     def run(script_code):
@@ -32,8 +32,8 @@ def run_example_in_subproc(
             # on windows we need to create a special __main__.py which will
             # be executed with ``python -m <modulename>`` on windows..
             shutil.copyfile(
-                examples_dir() / '__main__.py',
-                str(testdir / '__main__.py'),
+                os.path.join(examples_dir(), '__main__.py'),
+                os.path.join(str(testdir), '__main__.py')
             )
 
             # drop the ``if __name__ == '__main__'`` guard onwards from
@@ -81,15 +81,11 @@ def run_example_in_subproc(
     'example_script',
 
     # walk yields: (dirpath, dirnames, filenames)
-    [
-        (p[0], f) for p in os.walk(examples_dir()) for f in p[2]
+    [(p[0], f) for p in os.walk(examples_dir()) for f in p[2]
 
         if '__' not in f
         and f[0] != '_'
-        and 'debugging' not in p[0]
-        and 'integration' not in p[0]
-        and 'advanced_faults' not in p[0]
-    ],
+        and 'debugging' not in p[0]],
 
     ids=lambda t: t[1],
 )
@@ -117,19 +113,9 @@ def test_example(run_example_in_subproc, example_script):
             # print(f'STDOUT: {out}')
 
             # if we get some gnarly output let's aggregate and raise
-            if err:
-                errmsg = err.decode()
-                errlines = errmsg.splitlines()
-                last_error = errlines[-1]
-                if (
-                    'Error' in last_error
-
-                    # XXX: currently we print this to console, but maybe
-                    # shouldn't eventually once we figure out what's
-                    # a better way to be explicit about aio side
-                    # cancels?
-                    and 'asyncio.exceptions.CancelledError' not in last_error
-                ):
-                    raise Exception(errmsg)
+            errmsg = err.decode()
+            errlines = errmsg.splitlines()
+            if err and 'Error' in errlines[-1]:
+                raise Exception(errmsg)
 
             assert proc.returncode == 0

tests/test_infected_asyncio.py

@@ -2,36 +2,20 @@
 The hipster way to force SC onto the stdlib's "async": 'infection mode'.
 
 '''
-from typing import Optional, Iterable, Union
+from typing import Optional, Iterable
 import asyncio
 import builtins
-import itertools
 import importlib
 
-from exceptiongroup import BaseExceptionGroup
 import pytest
 import trio
 import tractor
-from tractor import (
-    to_asyncio,
-    RemoteActorError,
-)
-from tractor.trionics import BroadcastReceiver
+from tractor import to_asyncio
+from tractor import RemoteActorError
 
 
-async def sleep_and_err(
-    sleep_for: float = 0.1,
-
-    # just signature placeholders for compat with
-    # ``to_asyncio.open_channel_from()``
-    to_trio: Optional[trio.MemorySendChannel] = None,
-    from_trio: Optional[asyncio.Queue] = None,
-
-):
-    if to_trio:
-        to_trio.send_nowait('start')
-
-    await asyncio.sleep(sleep_for)
+async def sleep_and_err():
+    await asyncio.sleep(0.1)
     assert 0
 
 
@@ -160,81 +144,6 @@ def test_trio_cancels_aio(arb_addr):
     trio.run(main)
 
 
-@tractor.context
-async def trio_ctx(
-    ctx: tractor.Context,
-):
-
-    await ctx.started('start')
-
-    # this will block until the ``asyncio`` task sends a "first"
-    # message.
-    with trio.fail_after(2):
-        async with (
-            trio.open_nursery() as n,
-
-            tractor.to_asyncio.open_channel_from(
-                sleep_and_err,
-            ) as (first, chan),
-        ):
-
-            assert first == 'start'
-
-            # spawn another asyncio task for the cuck of it.
-            n.start_soon(
-                tractor.to_asyncio.run_task,
-                sleep_forever,
-            )
-            await trio.sleep_forever()
-
-
-@pytest.mark.parametrize(
-    'parent_cancels', [False, True],
-    ids='parent_actor_cancels_child={}'.format
-)
-def test_context_spawns_aio_task_that_errors(
-    arb_addr,
-    parent_cancels: bool,
-):
-    '''
-    Verify that spawning a task via an intertask channel ctx mngr that
-    errors correctly propagates the error back from the `asyncio`-side
-    task.
-
-    '''
-    async def main():
-
-        with trio.fail_after(2):
-            async with tractor.open_nursery() 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,
-                ) as (ctx, first):
-
-                    assert first == 'start'
-
-                    if parent_cancels:
-                        await p.cancel_actor()
-
-                    await trio.sleep_forever()
-
-    with pytest.raises(RemoteActorError) as excinfo:
-        trio.run(main)
-
-    err = excinfo.value
-    assert isinstance(err, RemoteActorError)
-    if parent_cancels:
-        assert err.type == trio.Cancelled
-    else:
-        assert err.type == AssertionError
-
-
 async def aio_cancel():
     ''''
     Cancel urself boi.
@@ -308,7 +217,6 @@ async def stream_from_aio(
     exit_early: bool = False,
     raise_err: bool = False,
     aio_raise_err: bool = False,
-    fan_out: bool = False,
 
 ) -> None:
     seq = range(100)
@@ -326,38 +234,15 @@ async def stream_from_aio(
 
             assert first is True
 
-            async def consume(
-                chan: Union[
-                    to_asyncio.LinkedTaskChannel,
-                    BroadcastReceiver,
-                ],
-            ):
-                async for value in chan:
-                    print(f'trio received {value}')
-                    pulled.append(value)
+            async for value in chan:
+                print(f'trio received {value}')
+                pulled.append(value)
 
-                    if value == 50:
-                        if raise_err:
-                            raise Exception
-                        elif exit_early:
-                            break
-
-            if fan_out:
-                # start second task that get's the same stream value set.
-                async with (
-
-                    # NOTE: this has to come first to avoid
-                    # the channel being closed before the nursery
-                    # tasks are joined..
-                    chan.subscribe() as br,
-
-                    trio.open_nursery() as n,
-                ):
-                    n.start_soon(consume, br)
-                    await consume(chan)
-
-            else:
-                await consume(chan)
+                if value == 50:
+                    if raise_err:
+                        raise Exception
+                    elif exit_early:
+                        break
     finally:
 
         if (
@@ -365,33 +250,19 @@ async def stream_from_aio(
             not exit_early and
             not aio_raise_err
         ):
-            if fan_out:
-                # we get double the pulled values in the
-                # ``.subscribe()`` fan out case.
-                doubled = list(itertools.chain(*zip(expect, expect)))
-                expect = doubled[:len(pulled)]
-                assert list(sorted(pulled)) == expect
-
-            else:
-                assert pulled == expect
+            assert pulled == expect
         else:
-            assert not fan_out
             assert pulled == expect[:51]
 
         print('trio guest mode task completed!')
 
 
-@pytest.mark.parametrize(
-    'fan_out', [False, True],
-    ids='fan_out_w_chan_subscribe={}'.format
-)
-def test_basic_interloop_channel_stream(arb_addr, fan_out):
+def test_basic_interloop_channel_stream(arb_addr):
     async def main():
         async with tractor.open_nursery() as n:
             portal = await n.run_in_actor(
                 stream_from_aio,
                 infect_asyncio=True,
-                fan_out=fan_out,
             )
             await portal.result()
 
@@ -410,12 +281,11 @@ def test_trio_error_cancels_intertask_chan(arb_addr):
             # should trigger remote actor error
             await portal.result()
 
-    with pytest.raises(BaseExceptionGroup) as excinfo:
+    with pytest.raises(RemoteActorError) as excinfo:
         trio.run(main)
 
-    # ensure boxed errors
-    for exc in excinfo.value.exceptions:
-        assert exc.type == Exception
+    # ensure boxed error is correct
+    assert excinfo.value.type == Exception
 
 
 def test_trio_closes_early_and_channel_exits(arb_addr):
@@ -444,12 +314,11 @@ def test_aio_errors_and_channel_propagates_and_closes(arb_addr):
             # should trigger remote actor error
             await portal.result()
 
-    with pytest.raises(BaseExceptionGroup) as excinfo:
+    with pytest.raises(RemoteActorError) as excinfo:
         trio.run(main)
 
-    # ensure boxed errors
-    for exc in excinfo.value.exceptions:
-        assert exc.type == Exception
+    # ensure boxed error is correct
+    assert excinfo.value.type == Exception
 
 
 @tractor.context
@@ -476,8 +345,6 @@ async def trio_to_aio_echo_server(
                 print('breaking aio echo loop')
                 break
 
-        print('exiting asyncio task')
-
     async with to_asyncio.open_channel_from(
         aio_echo_server,
     ) as (first, chan):

tests/test_local.py

@@ -11,18 +11,25 @@ from conftest import tractor_test
 
 
 @pytest.mark.trio
-async def test_no_runtime():
+async def test_no_arbitter():
     """An arbitter must be established before any nurseries
     can be created.
 
     (In other words ``tractor.open_root_actor()`` must be engaged at
     some point?)
     """
-    with pytest.raises(RuntimeError) :
-        async with tractor.find_actor('doggy'):
+    with pytest.raises(RuntimeError):
+        with tractor.open_nursery():
             pass
 
 
+def test_no_main():
+    """An async function **must** be passed to ``tractor.run()``.
+    """
+    with pytest.raises(TypeError):
+        tractor.run(None)
+
+
 @tractor_test
 async def test_self_is_registered(arb_addr):
     "Verify waiting on the arbiter to register itself using the standard api."

tests/test_pubsub.py

@@ -4,22 +4,20 @@ from itertools import cycle
 import pytest
 import trio
 import tractor
-from tractor.experimental import msgpub
-
-from conftest import tractor_test
+from tractor.testing import tractor_test
 
 
 def test_type_checks():
 
     with pytest.raises(TypeError) as err:
-        @msgpub
+        @tractor.msg.pub
         async def no_get_topics(yo):
             yield
 
     assert "must define a `get_topics`" in str(err.value)
 
     with pytest.raises(TypeError) as err:
-        @msgpub
+        @tractor.msg.pub
         def not_async_gen(yo):
             pass
 
@@ -34,7 +32,7 @@ def is_even(i):
 _get_topics = None
 
 
-@msgpub
+@tractor.msg.pub
 async def pubber(get_topics, seed=10):
 
     # ensure topic subscriptions are as expected
@@ -105,7 +103,7 @@ async def subs(
                 await stream.aclose()
 
 
-@msgpub(tasks=['one', 'two'])
+@tractor.msg.pub(tasks=['one', 'two'])
 async def multilock_pubber(get_topics):
     yield {'doggy': 10}
 

tests/test_runtime.py

@@ -1,73 +0,0 @@
-"""
-Verifying internal runtime state and undocumented extras.
-
-"""
-import os
-
-import pytest
-import trio
-import tractor
-
-from conftest import tractor_test
-
-
-_file_path: str = ''
-
-
-def unlink_file():
-    print('Removing tmp file!')
-    os.remove(_file_path)
-
-
-async def crash_and_clean_tmpdir(
-    tmp_file_path: str,
-    error: bool = True,
-):
-    global _file_path
-    _file_path = tmp_file_path
-
-    actor = tractor.current_actor()
-    actor.lifetime_stack.callback(unlink_file)
-
-    assert os.path.isfile(tmp_file_path)
-    await trio.sleep(0.1)
-    if error:
-        assert 0
-    else:
-        actor.cancel_soon()
-
-
-@pytest.mark.parametrize(
-    'error_in_child',
-    [True, False],
-)
-@tractor_test
-async def test_lifetime_stack_wipes_tmpfile(
-    tmp_path,
-    error_in_child: bool,
-):
-    child_tmp_file = tmp_path / "child.txt"
-    child_tmp_file.touch()
-    assert child_tmp_file.exists()
-    path = str(child_tmp_file)
-
-    try:
-        with trio.move_on_after(0.5):
-            async with tractor.open_nursery() as n:
-                    await (  # inlined portal
-                        await n.run_in_actor(
-                            crash_and_clean_tmpdir,
-                            tmp_file_path=path,
-                            error=error_in_child,
-                        )
-                    ).result()
-
-    except (
-        tractor.RemoteActorError,
-        tractor.BaseExceptionGroup,
-    ):
-        pass
-
-    # tmp file should have been wiped by
-    # teardown stack.
-    assert not child_tmp_file.exists()

tests/test_spawning.py

@@ -1,8 +1,7 @@
 """
 Spawning basics
-
 """
-from typing import Optional
+from typing import Dict, Tuple, Optional
 
 import pytest
 import trio
@@ -15,8 +14,8 @@ data_to_pass_down = {'doggy': 10, 'kitty': 4}
 
 async def spawn(
     is_arbiter: bool,
-    data: dict,
-    arb_addr: tuple[str, int],
+    data: Dict,
+    arb_addr: Tuple[str, int],
 ):
     namespaces = [__name__]
 
@@ -142,7 +141,7 @@ def test_loglevel_propagated_to_subactor(
     capfd,
     arb_addr,
 ):
-    if start_method == 'mp_forkserver':
+    if start_method == 'forkserver':
         pytest.skip(
             "a bug with `capfd` seems to make forkserver capture not work?")
 
@@ -151,13 +150,13 @@ def test_loglevel_propagated_to_subactor(
     async def main():
         async with tractor.open_nursery(
             name='arbiter',
+            loglevel=level,
             start_method=start_method,
             arbiter_addr=arb_addr,
 
         ) as tn:
             await tn.run_in_actor(
                 check_loglevel,
-                loglevel=level,
                 level=level,
             )
 

tests/test_streaming.py

@@ -7,10 +7,9 @@ import platform
 
 import trio
 import tractor
+from tractor.testing import tractor_test
 import pytest
 
-from conftest import tractor_test
-
 
 def test_must_define_ctx():
 
@@ -251,7 +250,7 @@ def test_a_quadruple_example(time_quad_ex, ci_env, spawn_backend):
 
     results, diff = time_quad_ex
     assert results
-    this_fast = 6 if platform.system() in ('Windows', 'Darwin') else 3
+    this_fast = 6 if platform.system() in ('Windows', 'Darwin') else 2.666
     assert diff < this_fast
 
 

tests/test_task_broadcasting.py

@@ -6,16 +6,13 @@ from contextlib import asynccontextmanager
 from functools import partial
 from itertools import cycle
 import time
-from typing import Optional
+from typing import Optional, List, Tuple
 
 import pytest
 import trio
 from trio.lowlevel import current_task
 import tractor
-from tractor.trionics import (
-    broadcast_receiver,
-    Lagged,
-)
+from tractor.trionics import broadcast_receiver, Lagged
 
 
 @tractor.context
@@ -40,7 +37,7 @@ async def echo_sequences(
 
 async def ensure_sequence(
 
-    stream: tractor.MsgStream,
+    stream: tractor.ReceiveMsgStream,
     sequence: list,
     delay: Optional[float] = None,
 
@@ -65,8 +62,8 @@ async def ensure_sequence(
 @asynccontextmanager
 async def open_sequence_streamer(
 
-    sequence: list[int],
-    arb_addr: tuple[str, int],
+    sequence: List[int],
+    arb_addr: Tuple[str, int],
     start_method: str,
 
 ) -> tractor.MsgStream:
@@ -214,8 +211,7 @@ def test_faster_task_to_recv_is_cancelled_by_slower(
     arb_addr,
     start_method,
 ):
-    '''
-    Ensure that if a faster task consuming from a stream is cancelled
+    '''Ensure that if a faster task consuming from a stream is cancelled
     the slower task can continue to receive all expected values.
 
     '''
@@ -464,51 +460,3 @@ def test_first_recver_is_cancelled():
                     assert value == 1
 
     trio.run(main)
-
-
-def test_no_raise_on_lag():
-    '''
-    Run a simple 2-task broadcast where one task is slow but configured
-    so that it does not raise `Lagged` on overruns using
-    `raise_on_lasg=False` and verify that the task does not raise.
-
-    '''
-    size = 100
-    tx, rx = trio.open_memory_channel(size)
-    brx = broadcast_receiver(rx, size)
-
-    async def slow():
-        async with brx.subscribe(
-            raise_on_lag=False,
-        ) as br:
-            async for msg in br:
-                print(f'slow task got: {msg}')
-                await trio.sleep(0.1)
-
-    async def fast():
-        async with brx.subscribe() as br:
-            async for msg in br:
-                print(f'fast task got: {msg}')
-
-    async def main():
-        async with (
-            tractor.open_root_actor(
-                # NOTE: so we see the warning msg emitted by the bcaster
-                # internals when the no raise flag is set.
-                loglevel='warning',
-            ),
-            trio.open_nursery() as n,
-        ):
-            n.start_soon(slow)
-            n.start_soon(fast)
-
-            for i in range(1000):
-                await tx.send(i)
-
-            # simulate user nailing ctl-c after realizing
-            # there's a lag in the slow task.
-            await trio.sleep(1)
-            raise KeyboardInterrupt
-
-    with pytest.raises(KeyboardInterrupt):
-        trio.run(main)

tests/test_trioisms.py

@@ -1,82 +0,0 @@
-'''
-Reminders for oddities in `trio` that we need to stay aware of and/or
-want to see changed.
-
-'''
-import pytest
-import trio
-from trio_typing import TaskStatus
-
-
-@pytest.mark.parametrize(
-    'use_start_soon', [
-        pytest.param(
-            True,
-            marks=pytest.mark.xfail(reason="see python-trio/trio#2258")
-        ),
-        False,
-    ]
-)
-def test_stashed_child_nursery(use_start_soon):
-
-    _child_nursery = None
-
-    async def waits_on_signal(
-        ev: trio.Event(),
-        task_status: TaskStatus[trio.Nursery] = trio.TASK_STATUS_IGNORED,
-    ):
-        '''
-        Do some stuf, then signal other tasks, then yield back to "starter".
-
-        '''
-        await ev.wait()
-        task_status.started()
-
-    async def mk_child_nursery(
-        task_status: TaskStatus = trio.TASK_STATUS_IGNORED,
-    ):
-        '''
-        Allocate a child sub-nursery and stash it as a global.
-
-        '''
-        nonlocal _child_nursery
-
-        async with trio.open_nursery() as cn:
-            _child_nursery = cn
-            task_status.started(cn)
-
-            # block until cancelled by parent.
-            await trio.sleep_forever()
-
-    async def sleep_and_err(
-        ev: trio.Event,
-        task_status: TaskStatus = trio.TASK_STATUS_IGNORED,
-    ):
-        await trio.sleep(0.5)
-        doggy()  # noqa
-        ev.set()
-        task_status.started()
-
-    async def main():
-
-        async with (
-            trio.open_nursery() as pn,
-        ):
-            cn = await pn.start(mk_child_nursery)
-            assert cn
-
-            ev = trio.Event()
-
-            if use_start_soon:
-                # this causes inf hang
-                cn.start_soon(sleep_and_err, ev)
-
-            else:
-                # this does not.
-                await cn.start(sleep_and_err, ev)
-
-            with trio.fail_after(1):
-                await cn.start(waits_on_signal, ev)
-
-    with pytest.raises(NameError):
-        trio.run(main)

towncrier.toml

@@ -0,0 +1,7 @@
+[tool.towncrier]
+package = "tractor"
+filename = "NEWS.rst"
+directory = "nooz/"
+title_format = "tractor {version} ({project_date})"
+version = "0.1.0a4"
+template = "nooz/_template.rst"

tractor/__init__.py

@@ -18,57 +18,39 @@
 tractor: structured concurrent "actors".
 
 """
-from exceptiongroup import BaseExceptionGroup
+from trio import MultiError
 
 from ._clustering import open_actor_cluster
 from ._ipc import Channel
 from ._streaming import (
     Context,
+    ReceiveMsgStream,
     MsgStream,
     stream,
     context,
 )
-from ._discovery import (
-    get_arbiter,
-    find_actor,
-    wait_for_actor,
-    query_actor,
-)
+from ._discovery import get_arbiter, find_actor, wait_for_actor
 from ._supervise import open_nursery
-from ._state import (
-    current_actor,
-    is_root_process,
-)
+from ._state import current_actor, is_root_process
 from ._exceptions import (
     RemoteActorError,
     ModuleNotExposed,
     ContextCancelled,
 )
-from ._debug import (
-    breakpoint,
-    post_mortem,
-)
+from ._debug import breakpoint, post_mortem
 from . import msg
-from ._root import (
-    run_daemon,
-    open_root_actor,
-)
+from ._root import run, run_daemon, open_root_actor
 from ._portal import Portal
-from ._runtime import Actor
 
 
 __all__ = [
-    'Actor',
     'Channel',
     'Context',
-    'ContextCancelled',
     'ModuleNotExposed',
-    'MsgStream',
-    'BaseExceptionGroup',
-    'Portal',
+    'MultiError',
     'RemoteActorError',
+    'ContextCancelled',
     'breakpoint',
-    'context',
     'current_actor',
     'find_actor',
     'get_arbiter',
@@ -77,10 +59,14 @@ __all__ = [
     'open_actor_cluster',
     'open_nursery',
     'open_root_actor',
+    'Portal',
     'post_mortem',
-    'query_actor',
+    'run',
     'run_daemon',
     'stream',
+    'context',
+    'ReceiveMsgStream',
+    'MsgStream',
     'to_asyncio',
     'wait_for_actor',
 ]

tractor/_child.py

@@ -24,7 +24,7 @@ import argparse
 
 from ast import literal_eval
 
-from ._runtime import Actor
+from ._actor import Actor
 from ._entry import _trio_main
 
 

tractor/_clustering.py

@@ -32,12 +32,9 @@ import tractor
 async def open_actor_cluster(
     modules: list[str],
     count: int = cpu_count(),
-    names: list[str] | None = None,
+    names: Optional[list[str]] = None,
+    start_method: Optional[str] = None,
     hard_kill: bool = False,
-
-    # passed through verbatim to ``open_root_actor()``
-    **runtime_kwargs,
-
 ) -> AsyncGenerator[
     dict[str, tractor.Portal],
     None,
@@ -52,9 +49,7 @@ async def open_actor_cluster(
         raise ValueError(
             'Number of names is {len(names)} but count it {count}')
 
-    async with tractor.open_nursery(
-        **runtime_kwargs,
-    ) as an:
+    async with tractor.open_nursery(start_method=start_method) as an:
         async with trio.open_nursery() as n:
             uid = tractor.current_actor().uid
 

tractor/_discovery.py

@@ -18,12 +18,9 @@
 Actor discovery API.
 
 """
-from typing import (
-    Optional,
-    Union,
-    AsyncGenerator,
-)
-from contextlib import asynccontextmanager as acm
+import typing
+from typing import Tuple, Optional, Union
+from async_generator import asynccontextmanager
 
 from ._ipc import _connect_chan, Channel
 from ._portal import (
@@ -34,13 +31,13 @@ from ._portal import (
 from ._state import current_actor, _runtime_vars
 
 
-@acm
+@asynccontextmanager
 async def get_arbiter(
 
     host: str,
     port: int,
 
-) -> AsyncGenerator[Union[Portal, LocalPortal], None]:
+) -> typing.AsyncGenerator[Union[Portal, LocalPortal], None]:
     '''Return a portal instance connected to a local or remote
     arbiter.
     '''
@@ -61,10 +58,10 @@ async def get_arbiter(
                 yield arb_portal
 
 
-@acm
+@asynccontextmanager
 async def get_root(
     **kwargs,
-) -> AsyncGenerator[Portal, None]:
+) -> typing.AsyncGenerator[Portal, None]:
 
     host, port = _runtime_vars['_root_mailbox']
     assert host is not None
@@ -74,56 +71,28 @@ async def get_root(
             yield portal
 
 
-@acm
-async def query_actor(
+@asynccontextmanager
+async def find_actor(
     name: str,
-    arbiter_sockaddr: Optional[tuple[str, int]] = None,
+    arbiter_sockaddr: Tuple[str, int] = None
+) -> typing.AsyncGenerator[Optional[Portal], None]:
+    """Ask the arbiter to find actor(s) by name.
 
-) -> AsyncGenerator[tuple[str, int], None]:
-    '''
-    Simple address lookup for a given actor name.
-
-    Returns the (socket) address or ``None``.
-
-    '''
+    Returns a connected portal to the last registered matching actor
+    known to the arbiter.
+    """
     actor = current_actor()
-    async with get_arbiter(
-        *arbiter_sockaddr or actor._arb_addr
-    ) as arb_portal:
+    async with get_arbiter(*arbiter_sockaddr or actor._arb_addr) as arb_portal:
 
-        sockaddr = await arb_portal.run_from_ns(
-            'self',
-            'find_actor',
-            name=name,
-        )
+        sockaddr = await arb_portal.run_from_ns('self', 'find_actor', name=name)
 
         # 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
+        elif sockaddr:
 
-
-@acm
-async def find_actor(
-    name: str,
-    arbiter_sockaddr: tuple[str, int] | None = None
-
-) -> AsyncGenerator[Optional[Portal], None]:
-    '''
-    Ask the arbiter to find actor(s) by name.
-
-    Returns a connected portal to the last registered matching actor
-    known to the arbiter.
-
-    '''
-    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
@@ -131,25 +100,20 @@ async def find_actor(
             yield None
 
 
-@acm
+@asynccontextmanager
 async def wait_for_actor(
     name: str,
-    arbiter_sockaddr: tuple[str, int] | None = None
-) -> AsyncGenerator[Portal, None]:
+    arbiter_sockaddr: Tuple[str, int] = None
+) -> typing.AsyncGenerator[Portal, None]:
     """Wait on an actor to register with the arbiter.
 
     A portal to the first registered actor is returned.
     """
     actor = current_actor()
 
-    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,
-        )
+    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)
         sockaddr = sockaddrs[-1]
 
         async with _connect_chan(*sockaddr) as chan:

tractor/_entry.py

@@ -18,28 +18,15 @@
 Sub-process entry points.
 
 """
-from __future__ import annotations
 from functools import partial
-from typing import (
-    Any,
-    TYPE_CHECKING,
-)
+from typing import Tuple, Any
+import signal
 
 import trio  # type: ignore
 
-from .log import (
-    get_console_log,
-    get_logger,
-)
+from .log import get_console_log, get_logger
 from . import _state
 from .to_asyncio import run_as_asyncio_guest
-from ._runtime import (
-    async_main,
-    Actor,
-)
-
-if TYPE_CHECKING:
-    from ._spawn import SpawnMethodKey
 
 
 log = get_logger(__name__)
@@ -47,11 +34,11 @@ log = get_logger(__name__)
 
 def _mp_main(
 
-    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,
+    actor: 'Actor',  # type: ignore
+    accept_addr: Tuple[str, int],
+    forkserver_info: Tuple[Any, Any, Any, Any, Any],
+    start_method: str,
+    parent_addr: Tuple[str, int] = None,
     infect_asyncio: bool = False,
 
 ) -> None:
@@ -76,8 +63,7 @@ def _mp_main(
 
     log.debug(f"parent_addr is {parent_addr}")
     trio_main = partial(
-        async_main,
-        actor,
+        actor._async_main,
         accept_addr,
         parent_addr=parent_addr
     )
@@ -96,9 +82,9 @@ def _mp_main(
 
 def _trio_main(
 
-    actor: Actor,  # type: ignore
+    actor: 'Actor',  # type: ignore
     *,
-    parent_addr: tuple[str, int] | None = None,
+    parent_addr: Tuple[str, int] = None,
     infect_asyncio: bool = False,
 
 ) -> None:
@@ -120,8 +106,7 @@ def _trio_main(
 
     log.debug(f"parent_addr is {parent_addr}")
     trio_main = partial(
-        async_main,
-        actor,
+        actor._async_main,
         parent_addr=parent_addr
     )
 

tractor/_exceptions.py

@@ -18,16 +18,11 @@
 Our classy exception set.
 
 """
-from typing import (
-    Any,
-    Optional,
-    Type,
-)
+from typing import Dict, Any, Optional, Type
 import importlib
 import builtins
 import traceback
 
-import exceptiongroup as eg
 import trio
 
 
@@ -53,6 +48,9 @@ class RemoteActorError(Exception):
         self.type = suberror_type
         self.msgdata = msgdata
 
+    # TODO: a trio.MultiError.catch like context manager
+    # for catching underlying remote errors of a particular type
+
 
 class InternalActorError(RemoteActorError):
     """Remote internal ``tractor`` error indicating
@@ -97,7 +95,7 @@ def pack_error(
     exc: BaseException,
     tb=None,
 
-) -> dict[str, Any]:
+) -> Dict[str, Any]:
     """Create an "error message" for tranmission over
     a channel (aka the wire).
     """
@@ -116,17 +114,15 @@ def pack_error(
 
 def unpack_error(
 
-    msg: dict[str, Any],
+    msg: Dict[str, Any],
     chan=None,
     err_type=RemoteActorError
 
 ) -> Exception:
-    '''
-    Unpack an 'error' message from the wire
+    """Unpack an 'error' message from the wire
     into a local ``RemoteActorError``.
 
-    '''
-    __tracebackhide__ = True
+    """
     error = msg['error']
 
     tb_str = error.get('tb_str', '')
@@ -139,12 +135,7 @@ def unpack_error(
         suberror_type = trio.Cancelled
 
     else:  # try to lookup a suitable local error type
-        for ns in [
-            builtins,
-            _this_mod,
-            eg,
-            trio,
-        ]:
+        for ns in [builtins, _this_mod, trio]:
             try:
                 suberror_type = getattr(ns, type_name)
                 break
@@ -163,15 +154,12 @@ def unpack_error(
 
 
 def is_multi_cancelled(exc: BaseException) -> bool:
-    '''
-    Predicate to determine if a possible ``eg.BaseExceptionGroup`` contains
-    only ``trio.Cancelled`` sub-exceptions (and is likely the result of
+    """Predicate to determine if a ``trio.MultiError`` contains only
+    ``trio.Cancelled`` sub-exceptions (and is likely the result of
     cancelling a collection of subtasks.
 
-    '''
-    if isinstance(exc, eg.BaseExceptionGroup):
-        return exc.subgroup(
-            lambda exc: isinstance(exc, trio.Cancelled)
-        ) is not None
-
-    return False
+    """
+    return not trio.MultiError.filter(
+        lambda exc: exc if not isinstance(exc, trio.Cancelled) else None,
+        exc,
+    )

tractor/_ipc.py

@@ -22,21 +22,14 @@ from __future__ import annotations
 import platform
 import struct
 import typing
-from collections.abc import (
-    AsyncGenerator,
-    AsyncIterator,
-)
+from collections.abc import AsyncGenerator, AsyncIterator
 from typing import (
-    Any,
-    runtime_checkable,
-    Optional,
-    Protocol,
-    Type,
-    TypeVar,
+    Any, Tuple, Optional,
+    Type, Protocol, TypeVar,
 )
 
 from tricycle import BufferedReceiveStream
-import msgspec
+import msgpack
 import trio
 from async_generator import asynccontextmanager
 
@@ -49,7 +42,7 @@ _is_windows = platform.system() == 'Windows'
 log = get_logger(__name__)
 
 
-def get_stream_addrs(stream: trio.SocketStream) -> tuple:
+def get_stream_addrs(stream: trio.SocketStream) -> Tuple:
     # should both be IP sockets
     lsockname = stream.socket.getsockname()
     rsockname = stream.socket.getpeername()
@@ -67,7 +60,6 @@ MsgType = TypeVar("MsgType")
 # - https://jcristharif.com/msgspec/usage.html#structs
 
 
-@runtime_checkable
 class MsgTransport(Protocol[MsgType]):
 
     stream: trio.SocketStream
@@ -95,27 +87,22 @@ class MsgTransport(Protocol[MsgType]):
         ...
 
     @property
-    def laddr(self) -> tuple[str, int]:
+    def laddr(self) -> Tuple[str, int]:
         ...
 
     @property
-    def raddr(self) -> tuple[str, int]:
+    def raddr(self) -> Tuple[str, int]:
         ...
 
 
-# TODO: not sure why we have to inherit here, but it seems to be an
-# issue with ``get_msg_transport()`` returning a ``Type[Protocol]``;
-# probably should make a `mypy` issue?
-class MsgpackTCPStream(MsgTransport):
-    '''
-    A ``trio.SocketStream`` delivering ``msgpack`` formatted data
-    using the ``msgspec`` codec lib.
+class MsgpackTCPStream:
+    '''A ``trio.SocketStream`` delivering ``msgpack`` formatted data
+    using ``msgpack-python``.
 
     '''
     def __init__(
         self,
         stream: trio.SocketStream,
-        prefix_size: int = 4,
 
     ) -> None:
 
@@ -132,92 +119,66 @@ class MsgpackTCPStream(MsgTransport):
         # public i guess?
         self.drained: list[dict] = []
 
-        self.recv_stream = BufferedReceiveStream(transport_stream=stream)
-        self.prefix_size = prefix_size
-
-        # 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 packets from the underlying stream.
-
-        '''
-        import msgspec  # noqa
-        decodes_failed: int = 0
-
+        """Yield packets from the underlying stream.
+        """
+        unpacker = msgpack.Unpacker(
+            raw=False,
+            use_list=False,
+            strict_map_key=False
+        )
         while True:
             try:
-                header = await self.recv_stream.receive_exactly(4)
+                data = await self.stream.receive_some(2**10)
 
-            except (
-                ValueError,
-                ConnectionResetError,
+            except trio.BrokenResourceError as err:
+                msg = err.args[0]
 
-                # not sure entirely why we need this but without it we
-                # seem to be getting racy failures here on
-                # arbiter/registry name subs..
-                trio.BrokenResourceError,
-            ):
-                raise TransportClosed(
-                    f'transport {self} was already closed prior ro read'
-                )
+                # XXX: handle connection-reset-by-peer the same as a EOF.
+                # we're currently remapping this since we allow
+                # a quick connect then drop for root actors when
+                # checking to see if there exists an "arbiter"
+                # on the chosen sockaddr (``_root.py:108`` or thereabouts)
+                if (
+                    # nix
+                    '[Errno 104]' in msg or
 
-            if header == b'':
-                raise TransportClosed(
-                    f'transport {self} was already closed prior ro read'
-                )
-
-            size, = struct.unpack("<I", header)
-
-            log.transport(f'received header {size}')  # type: ignore
-
-            msg_bytes = await self.recv_stream.receive_exactly(size)
-
-            log.transport(f"received {msg_bytes}")  # type: ignore
-            try:
-                yield self.decode(msg_bytes)
-            except (
-                msgspec.DecodeError,
-                UnicodeDecodeError,
-            ):
-                if decodes_failed < 4:
-                    # ignore decoding errors for now and assume they have to
-                    # do with a channel drop - hope that receiving from the
-                    # channel will raise an expected error and bubble up.
-                    try:
-                        msg_str: str | bytes = msg_bytes.decode()
-                    except UnicodeDecodeError:
-                        msg_str = msg_bytes
-
-                    log.error(
-                        '`msgspec` failed to decode!?\n'
-                        'dumping bytes:\n'
-                        f'{msg_str!r}'
+                    # on windows it seems there are a variety of errors
+                    # to handle..
+                    _is_windows
+                ):
+                    raise TransportClosed(
+                        f'{self} was broken with {msg}'
                     )
-                    decodes_failed += 1
+
                 else:
                     raise
 
-    async def send(self, msg: Any) -> None:
-        async with self._send_lock:
+            log.transport(f"received {data}")  # type: ignore
 
-            bytes_data: bytes = self.encode(msg)
+            if data == b'':
+                raise TransportClosed(
+                    f'transport {self} was already closed prior to read'
+                )
 
-            # supposedly the fastest says,
-            # https://stackoverflow.com/a/54027962
-            size: bytes = struct.pack("<I", len(bytes_data))
-
-            return await self.stream.send_all(size + bytes_data)
+            unpacker.feed(data)
+            for packet in unpacker:
+                yield packet
 
     @property
-    def laddr(self) -> tuple[str, int]:
+    def laddr(self) -> Tuple[Any, ...]:
         return self._laddr
 
     @property
-    def raddr(self) -> tuple[str, int]:
+    def raddr(self) -> Tuple[Any, ...]:
         return self._raddr
 
+    async def send(self, msg: Any) -> None:
+        async with self._send_lock:
+            return await self.stream.send_all(
+                msgpack.dumps(msg, use_bin_type=True)
+            )
+
     async def recv(self) -> Any:
         return await self._agen.asend(None)
 
@@ -242,14 +203,99 @@ class MsgpackTCPStream(MsgTransport):
         return self.stream.socket.fileno() != -1
 
 
+class MsgspecTCPStream(MsgpackTCPStream):
+    '''
+    A ``trio.SocketStream`` delivering ``msgpack`` formatted data
+    using ``msgspec``.
+
+    '''
+    def __init__(
+        self,
+        stream: trio.SocketStream,
+        prefix_size: int = 4,
+
+    ) -> None:
+        import msgspec
+
+        super().__init__(stream)
+        self.recv_stream = BufferedReceiveStream(transport_stream=stream)
+        self.prefix_size = prefix_size
+
+        # TODO: struct aware messaging coders
+        self.encode = msgspec.Encoder().encode
+        self.decode = msgspec.Decoder().decode  # dict[str, Any])
+
+    async def _iter_packets(self) -> AsyncGenerator[dict, None]:
+        '''Yield packets from the underlying stream.
+
+        '''
+        import msgspec  # noqa
+        last_decode_failed: bool = False
+
+        while True:
+            try:
+                header = await self.recv_stream.receive_exactly(4)
+
+            except (
+                ValueError,
+
+                # not sure entirely why we need this but without it we
+                # seem to be getting racy failures here on
+                # arbiter/registry name subs..
+                trio.BrokenResourceError,
+            ):
+                raise TransportClosed(
+                    f'transport {self} was already closed prior ro read'
+                )
+
+            if header == b'':
+                raise TransportClosed(
+                    f'transport {self} was already closed prior ro read'
+                )
+
+            size, = struct.unpack("<I", header)
+
+            log.transport(f'received header {size}')  # type: ignore
+
+            msg_bytes = await self.recv_stream.receive_exactly(size)
+
+            log.transport(f"received {msg_bytes}")  # type: ignore
+            try:
+                yield self.decode(msg_bytes)
+            except (
+                msgspec.DecodingError,
+                UnicodeDecodeError,
+            ):
+                if not last_decode_failed:
+                    # ignore decoding errors for now and assume they have to
+                    # do with a channel drop - hope that receiving from the
+                    # channel will raise an expected error and bubble up.
+                    log.error('`msgspec` failed to decode!?')
+                    last_decode_failed = True
+                else:
+                    raise
+
+    async def send(self, msg: Any) -> None:
+        async with self._send_lock:
+
+            bytes_data: bytes = self.encode(msg)
+
+            # supposedly the fastest says,
+            # https://stackoverflow.com/a/54027962
+            size: bytes = struct.pack("<I", len(bytes_data))
+
+            return await self.stream.send_all(size + bytes_data)
+
+
 def get_msg_transport(
 
-    key: tuple[str, str],
+    key: Tuple[str, str],
 
 ) -> Type[MsgTransport]:
 
     return {
         ('msgpack', 'tcp'): MsgpackTCPStream,
+        ('msgspec', 'tcp'): MsgspecTCPStream,
     }[key]
 
 
@@ -258,18 +304,16 @@ class Channel:
     An inter-process channel for communication between (remote) actors.
 
     Wraps a ``MsgStream``: transport + encoding IPC connection.
-
     Currently we only support ``trio.SocketStream`` for transport
-    (aka TCP) and the ``msgpack`` interchange format via the ``msgspec``
-    codec libary.
+    (aka TCP).
 
     '''
     def __init__(
 
         self,
-        destaddr: Optional[tuple[str, int]],
+        destaddr: Optional[Tuple[str, int]],
 
-        msg_transport_type_key: tuple[str, str] = ('msgpack', 'tcp'),
+        msg_transport_type_key: Tuple[str, str] = ('msgpack', 'tcp'),
 
         # TODO: optional reconnection support?
         # auto_reconnect: bool = False,
@@ -280,6 +324,14 @@ class Channel:
         # self._recon_seq = on_reconnect
         # self._autorecon = auto_reconnect
 
+        # TODO: maybe expose this through the nursery api?
+        try:
+            # if installed load the msgspec transport since it's faster
+            import msgspec  # noqa
+            msg_transport_type_key = ('msgspec', 'tcp')
+        except ImportError:
+            pass
+
         self._destaddr = destaddr
         self._transport_key = msg_transport_type_key
 
@@ -289,7 +341,7 @@ class Channel:
         self.msgstream: Optional[MsgTransport] = None
 
         # set after handshake - always uid of far end
-        self.uid: Optional[tuple[str, str]] = None
+        self.uid: Optional[Tuple[str, str]] = None
 
         self._agen = self._aiter_recv()
         self._exc: Optional[Exception] = None  # set if far end actor errors
@@ -317,7 +369,7 @@ class Channel:
     def set_msg_transport(
         self,
         stream: trio.SocketStream,
-        type_key: Optional[tuple[str, str]] = None,
+        type_key: Optional[Tuple[str, str]] = None,
 
     ) -> MsgTransport:
         type_key = type_key or self._transport_key
@@ -332,16 +384,16 @@ class Channel:
         return object.__repr__(self)
 
     @property
-    def laddr(self) -> Optional[tuple[str, int]]:
+    def laddr(self) -> Optional[Tuple[str, int]]:
         return self.msgstream.laddr if self.msgstream else None
 
     @property
-    def raddr(self) -> Optional[tuple[str, int]]:
+    def raddr(self) -> Optional[Tuple[str, int]]:
         return self.msgstream.raddr if self.msgstream else None
 
     async def connect(
         self,
-        destaddr: tuple[Any, ...] | None = None,
+        destaddr: Tuple[Any, ...] = None,
         **kwargs
 
     ) -> MsgTransport:

tractor/_mp_fixup_main.py

@@ -18,9 +18,9 @@
 Helpers pulled mostly verbatim from ``multiprocessing.spawn``
 to aid with "fixing up" the ``__main__`` module in subprocesses.
 
-These helpers are needed for any spawing backend that doesn't already
-handle this. For example when using ``trio_run_in_process`` it is needed
-but obviously not when we're already using ``multiprocessing``.
+These helpers are needed for any spawing backend that doesn't already handle this.
+For example when using ``trio_run_in_process`` it is needed but obviously not when
+we're already using ``multiprocessing``.
 
 """
 import os
@@ -28,12 +28,13 @@ import sys
 import platform
 import types
 import runpy
+from typing import Dict
 
 
 ORIGINAL_DIR = os.path.abspath(os.getcwd())
 
 
-def _mp_figure_out_main() -> dict[str, str]:
+def _mp_figure_out_main() -> Dict[str, str]:
     """Taken from ``multiprocessing.spawn.get_preparation_data()``.
 
     Retrieve parent actor `__main__` module data.

tractor/_portal.py

@@ -14,18 +14,16 @@
 # 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/>.
 
-'''
+"""
 Memory boundary "Portals": an API for structured
 concurrency linked tasks running in disparate memory domains.
 
-'''
-from __future__ import annotations
+"""
 import importlib
 import inspect
 from typing import (
     Any, Optional,
-    Callable, AsyncGenerator,
-    Type,
+    Callable, AsyncGenerator
 )
 from functools import partial
 from dataclasses import dataclass
@@ -35,38 +33,58 @@ import warnings
 import trio
 from async_generator import asynccontextmanager
 
-from .trionics import maybe_open_nursery
 from ._state import current_actor
 from ._ipc import Channel
 from .log import get_logger
-from .msg import NamespacePath
 from ._exceptions import (
     unpack_error,
     NoResult,
     ContextCancelled,
 )
-from ._streaming import (
-    Context,
-    MsgStream,
-)
+from ._streaming import Context, ReceiveMsgStream
 
 
 log = get_logger(__name__)
 
 
+@asynccontextmanager
+async def maybe_open_nursery(
+    nursery: trio.Nursery = None,
+    shield: bool = False,
+) -> AsyncGenerator[trio.Nursery, Any]:
+    '''
+    Create a new nursery if None provided.
+
+    Blocks on exit as expected if no input nursery is provided.
+
+    '''
+    if nursery is not None:
+        yield nursery
+    else:
+        async with trio.open_nursery() as nursery:
+            nursery.cancel_scope.shield = shield
+            yield nursery
+
+
+def func_deats(func: Callable) -> tuple[str, str]:
+    return (
+        func.__module__,
+        func.__name__,
+    )
+
+
 def _unwrap_msg(
+
     msg: dict[str, Any],
     channel: Channel
 
 ) -> Any:
-    __tracebackhide__ = True
     try:
         return msg['return']
     except KeyError:
         # internal error should never get here
         assert msg.get('cid'), "Received internal error at portal?"
-        raise unpack_error(msg, channel) from None
-
+        raise unpack_error(msg, channel)
 
 class MessagingError(Exception):
     'Some kind of unexpected SC messaging dialog issue'
@@ -104,7 +122,7 @@ class Portal:
         # it is expected that ``result()`` will be awaited at some
         # point.
         self._expect_result: Optional[Context] = None
-        self._streams: set[MsgStream] = set()
+        self._streams: set[ReceiveMsgStream] = set()
         self.actor = current_actor()
 
     async def _submit_for_result(
@@ -139,7 +157,6 @@ class Portal:
         Return the result(s) from the remote actor's "main" task.
 
         '''
-        # __tracebackhide__ = True
         # Check for non-rpc errors slapped on the
         # channel for which we always raise
         exc = self.channel._exc
@@ -189,7 +206,7 @@ class Portal:
 
     async def cancel_actor(
         self,
-        timeout: float | None = None,
+        timeout: float = None,
 
     ) -> bool:
         '''
@@ -299,7 +316,7 @@ class Portal:
                 raise TypeError(
                     f'{func} must be a non-streaming async function!')
 
-            fn_mod_path, fn_name = NamespacePath.from_ref(func).to_tuple()
+            fn_mod_path, fn_name = func_deats(func)
 
         ctx = await self.actor.start_remote_task(
             self.channel,
@@ -319,7 +336,7 @@ class Portal:
         async_gen_func: Callable,  # typing: ignore
         **kwargs,
 
-    ) -> AsyncGenerator[MsgStream, None]:
+    ) -> AsyncGenerator[ReceiveMsgStream, None]:
 
         if not inspect.isasyncgenfunction(async_gen_func):
             if not (
@@ -329,8 +346,7 @@ class Portal:
                 raise TypeError(
                     f'{async_gen_func} must be an async generator function!')
 
-        fn_mod_path, fn_name = NamespacePath.from_ref(
-            async_gen_func).to_tuple()
+        fn_mod_path, fn_name = func_deats(async_gen_func)
         ctx = await self.actor.start_remote_task(
             self.channel,
             fn_mod_path,
@@ -344,7 +360,7 @@ class Portal:
 
         try:
             # deliver receive only stream
-            async with MsgStream(
+            async with ReceiveMsgStream(
                 ctx, ctx._recv_chan,
             ) as rchan:
                 self._streams.add(rchan)
@@ -396,7 +412,7 @@ class Portal:
             raise TypeError(
                 f'{func} must be an async generator function!')
 
-        fn_mod_path, fn_name = NamespacePath.from_ref(func).to_tuple()
+        fn_mod_path, fn_name = func_deats(func)
 
         ctx = await self.actor.start_remote_task(
             self.channel,
@@ -414,7 +430,7 @@ class Portal:
             first = msg['started']
             ctx._started_called = True
 
-        except KeyError:
+        except KeyError as kerr:
             assert msg.get('cid'), ("Received internal error at context?")
 
             if msg.get('error'):
@@ -429,10 +445,6 @@ class Portal:
         _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:
@@ -464,27 +476,17 @@ class Portal:
             # sure it's worth being pedantic:
             # Exception,
             # trio.Cancelled,
+            # trio.MultiError,
             # KeyboardInterrupt,
 
         ) as err:
-            etype = type(err)
+            _err = err
             # the context cancels itself on any cancel
             # causing error.
+            log.cancel(
+                f'Context to {self.channel.uid} sending cancel request..')
 
-            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}'
-                )
-
+            await ctx.cancel()
             raise
 
         finally:
@@ -493,17 +495,7 @@ class Portal:
             # 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}`'
-                )
+            result = await ctx.result()
 
             # though it should be impossible for any tasks
             # operating *in* this scope to have survived
@@ -513,34 +505,23 @@ class Portal:
                 # should we encapsulate this in the context api?
                 await ctx._recv_chan.aclose()
 
-            if etype:
+            if _err:
                 if ctx._cancel_called:
                     log.cancel(
-                        f'Context {fn_name} cancelled by caller with\n{etype}'
+                        f'Context {fn_name} cancelled by caller with\n{_err}'
                     )
                 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}'
+                        f'Context {fn_name} cancelled by callee with\n{_err}'
                     )
-            # 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()
+            else:
+                log.runtime(
+                    f'Context {fn_name} returned '
+                    f'value from callee `{result}`'
+                )
 
             # remove the context from runtime tracking
-            self.actor._contexts.pop(
-                (self.channel.uid, ctx.cid),
-                None,
-            )
+            self.actor._contexts.pop((self.channel.uid, ctx.cid))
 
 
 @dataclass
@@ -597,11 +578,9 @@ async def open_portal(
 
         msg_loop_cs: Optional[trio.CancelScope] = None
         if start_msg_loop:
-            from ._runtime import process_messages
             msg_loop_cs = await nursery.start(
                 partial(
-                    process_messages,
-                    actor,
+                    actor._process_messages,
                     channel,
                     # if the local task is cancelled we want to keep
                     # the msg loop running until our block ends

tractor/_root.py

@@ -22,21 +22,14 @@ from contextlib import asynccontextmanager
 from functools import partial
 import importlib
 import logging
-import signal
-import sys
 import os
+from typing import Tuple, Optional, List, Any
 import typing
 import warnings
 
-
-from exceptiongroup import BaseExceptionGroup
 import trio
 
-from ._runtime import (
-    Actor,
-    Arbiter,
-    async_main,
-)
+from ._actor import Actor, Arbiter
 from . import _debug
 from . import _spawn
 from . import _state
@@ -56,45 +49,37 @@ logger = log.get_logger('tractor')
 @asynccontextmanager
 async def open_root_actor(
 
-    *,
     # defaults are above
-    arbiter_addr: tuple[str, int] | None = None,
+    arbiter_addr: Optional[Tuple[str, int]] = (
+        _default_arbiter_host,
+        _default_arbiter_port,
+    ),
 
-    # defaults are above
-    registry_addr: tuple[str, int] | None = None,
-
-    name: str | None = 'root',
+    name: Optional[str] = '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: Optional[str] = None,
 
     # enables the multi-process debugger support
     debug_mode: bool = False,
 
     # internal logging
-    loglevel: str | None = None,
+    loglevel: Optional[str] = None,
 
-    enable_modules: list | None = None,
-    rpc_module_paths: list | None = None,
+    enable_modules: Optional[List] = None,
+    rpc_module_paths: Optional[List] = None,
 
 ) -> typing.Any:
-    '''
-    Runtime init entry point for ``tractor``.
+    """Async entry point for ``tractor``.
 
-    '''
+    """
     # Override the global debugger hook to make it play nice with
-    # ``trio``, see much discussion in:
+    # ``trio``, see:
     # https://github.com/python-trio/trio/issues/1155#issuecomment-742964018
-    builtin_bp_handler = sys.breakpointhook
-    orig_bp_path: str | None = os.environ.get('PYTHONBREAKPOINT', None)
     os.environ['PYTHONBREAKPOINT'] = 'tractor._debug._set_trace'
 
-    # attempt to retreive ``trio``'s sigint handler and stash it
-    # on our debugger lock state.
-    _debug.Lock._trio_handler = signal.getsignal(signal.SIGINT)
-
     # mark top most level process as root actor
     _state._runtime_vars['_is_root'] = True
 
@@ -113,24 +98,18 @@ async def open_root_actor(
     if start_method is not None:
         _spawn.try_set_start_method(start_method)
 
-    if arbiter_addr is not None:
-        warnings.warn(
-            '`arbiter_addr` is now deprecated and has been renamed to'
-            '`registry_addr`.\nUse that instead..',
-            DeprecationWarning,
-            stacklevel=2,
-        )
-
-    registry_addr = (host, port) = (
-        registry_addr
-        or arbiter_addr
-        or (
-            _default_arbiter_host,
-            _default_arbiter_port,
-        )
+    arbiter_addr = (host, port) = arbiter_addr or (
+        _default_arbiter_host,
+        _default_arbiter_port,
     )
 
-    loglevel = (loglevel or log._default_loglevel).upper()
+    if loglevel is None:
+        loglevel = log.get_loglevel()
+    else:
+        log._default_loglevel = loglevel
+        log.get_console_log(loglevel)
+
+    assert loglevel
 
     if debug_mode and _spawn._spawn_method == 'trio':
         _state._runtime_vars['_debug_mode'] = True
@@ -145,7 +124,7 @@ async def open_root_actor(
             logging.getLevelName(
                 # lul, need the upper case for the -> int map?
                 # sweet "dynamic function behaviour" stdlib...
-                loglevel,
+                loglevel.upper()
             ) > logging.getLevelName('PDB')
         ):
             loglevel = 'PDB'
@@ -155,25 +134,20 @@ async def open_root_actor(
             "Debug mode is only supported for the `trio` backend!"
         )
 
-    log.get_console_log(loglevel)
+    # make a temporary connection to see if an arbiter exists
+    arbiter_found = False
 
     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
-
         # 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 with _connect_chan(host, port):
+            arbiter_found = True
 
     except OSError:
-        # TODO: make this a "discovery" log level?
-        logger.warning(f"No actor registry found @ {host}:{port}")
+        logger.warning(f"No actor could be found @ {host}:{port}")
 
     # create a local actor and start up its main routine/task
     if arbiter_found:
@@ -183,7 +157,7 @@ async def open_root_actor(
 
         actor = Actor(
             name or 'anonymous',
-            arbiter_addr=registry_addr,
+            arbiter_addr=arbiter_addr,
             loglevel=loglevel,
             enable_modules=enable_modules,
         )
@@ -199,7 +173,7 @@ async def open_root_actor(
 
         actor = Arbiter(
             name or 'arbiter',
-            arbiter_addr=registry_addr,
+            arbiter_addr=arbiter_addr,
             loglevel=loglevel,
             enable_modules=enable_modules,
         )
@@ -215,14 +189,13 @@ async def open_root_actor(
         # start the actor runtime in a new task
         async with trio.open_nursery() as nursery:
 
-            # ``_runtime.async_main()`` creates an internal nursery and
+            # ``Actor._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,
+                    actor._async_main,
                     accept_addr=(host, port),
                     parent_addr=None
                 )
@@ -230,10 +203,7 @@ async def open_root_actor(
             try:
                 yield actor
 
-            except (
-                Exception,
-                BaseExceptionGroup,
-            ) as err:
+            except (Exception, trio.MultiError) as err:
 
                 entered = await _debug._maybe_enter_pm(err)
 
@@ -246,8 +216,7 @@ async def open_root_actor(
             finally:
                 # NOTE: not sure if we'll ever need this but it's
                 # possibly better for even more determinism?
-                # logger.cancel(
-                #     f'Waiting on {len(nurseries)} nurseries in root..')
+                # logger.cancel(f'Waiting on {len(nurseries)} nurseries in root..')
                 # nurseries = actor._actoruid2nursery.values()
                 # async with trio.open_nursery() as tempn:
                 #     for an in nurseries:
@@ -257,40 +226,64 @@ async def open_root_actor(
                 await actor.cancel()
     finally:
         _state._current_actor = None
-
-        # restore breakpoint hook state
-        sys.breakpointhook = builtin_bp_handler
-        if orig_bp_path is not None:
-            os.environ['PYTHONBREAKPOINT'] = orig_bp_path
-        else:
-            # clear env back to having no entry
-            os.environ.pop('PYTHONBREAKPOINT')
-
         logger.runtime("Root actor terminated")
 
 
-def run_daemon(
-    enable_modules: list[str],
+def run(
+
+    # target
+    async_fn: typing.Callable[..., typing.Awaitable],
+    *args,
 
     # runtime kwargs
-    name: str | None = 'root',
-    registry_addr: tuple[str, int] = (
+    name: Optional[str] = 'root',
+    arbiter_addr: Tuple[str, int] = (
         _default_arbiter_host,
         _default_arbiter_port,
     ),
 
-    start_method: str | None = None,
+    start_method: Optional[str] = None,
     debug_mode: bool = False,
-    **kwargs
+    **kwargs,
 
+) -> Any:
+    """Run a trio-actor async function in process.
+
+    This is tractor's main entry and the start point for any async actor.
+    """
+    async def _main():
+
+        async with open_root_actor(
+            arbiter_addr=arbiter_addr,
+            name=name,
+            start_method=start_method,
+            debug_mode=debug_mode,
+            **kwargs,
+        ):
+
+            return await async_fn(*args)
+
+    warnings.warn(
+        "`tractor.run()` is now deprecated. `tractor` now"
+        " implicitly starts the root actor on first actor nursery"
+        " use. If you want to start the root actor manually, use"
+        " `tractor.open_root_actor()`.",
+        DeprecationWarning,
+        stacklevel=2,
+    )
+    return trio.run(_main)
+
+
+def run_daemon(
+    enable_modules: list[str],
+    **kwargs
 ) -> None:
     '''
-    Spawn daemon actor which will respond to RPC; the main task simply
-    starts the runtime and then sleeps forever.
+    Spawn daemon actor which will respond to RPC.
 
-    This is a very minimal convenience wrapper around starting
-    a "run-until-cancelled" root actor which can be started with a set
-    of enabled modules for RPC request handling.
+    This is a convenience wrapper around
+    ``tractor.run(trio.sleep(float('inf')))`` such that the first actor spawned
+    is meant to run forever responding to RPC requests.
 
     '''
     kwargs['enable_modules'] = list(enable_modules)
@@ -298,15 +291,4 @@ def run_daemon(
     for path in enable_modules:
         importlib.import_module(path)
 
-    async def _main():
-
-        async with open_root_actor(
-            registry_addr=registry_addr,
-            name=name,
-            start_method=start_method,
-            debug_mode=debug_mode,
-            **kwargs,
-        ):
-            return await trio.sleep_forever()
-
-    return trio.run(_main)
+    return run(partial(trio.sleep, float('inf')), **kwargs)

tractor/_spawn.py

@@ -18,22 +18,30 @@
 Machinery for actor process spawning using multiple backends.
 
 """
-from __future__ import annotations
 import sys
+import multiprocessing as mp
 import platform
 from typing import (
-    Any,
-    Awaitable,
-    Literal,
-    Callable,
+    Any, Dict, Optional, Callable,
     TypeVar,
-    TYPE_CHECKING,
 )
+from collections.abc import Awaitable
 
-from exceptiongroup import BaseExceptionGroup
 import trio
 from trio_typing import TaskStatus
 
+try:
+    from multiprocessing import semaphore_tracker  # type: ignore
+    resource_tracker = semaphore_tracker
+    resource_tracker._resource_tracker = resource_tracker._semaphore_tracker
+except ImportError:
+    # 3.8 introduces a more general version that also tracks shared mems
+    from multiprocessing import resource_tracker  # type: ignore
+
+from multiprocessing import forkserver  # type: ignore
+from typing import Tuple
+
+from . import _forkserver_override
 from ._debug import (
     maybe_wait_for_debugger,
     acquire_debug_lock,
@@ -44,33 +52,24 @@ from ._state import (
     is_root_process,
     debug_mode,
 )
+
 from .log import get_logger
 from ._portal import Portal
-from ._runtime import Actor
+from ._actor 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')
+ProcessType = TypeVar('ProcessType', mp.Process, trio.Process)
 
 # placeholder for an mp start context if so using that backend
-_ctx: mp.context.BaseContext | None = None
-SpawnMethodKey = Literal[
-    'trio',  # supported on all platforms
-    'mp_spawn',
-    'mp_forkserver',  # posix only
-]
-_spawn_method: SpawnMethodKey = 'trio'
+_ctx: Optional[mp.context.BaseContext] = None
+_spawn_method: str = "trio"
 
 
 if platform.system() == 'Windows':
 
-    import multiprocessing as mp
     _ctx = mp.get_context("spawn")
 
     async def proc_waiter(proc: mp.Process) -> None:
@@ -82,10 +81,7 @@ else:
         await trio.lowlevel.wait_readable(proc.sentinel)
 
 
-def try_set_start_method(
-    key: SpawnMethodKey
-
-) -> mp.context.BaseContext | None:
+def try_set_start_method(name: str) -> Optional[mp.context.BaseContext]:
     '''
     Attempt to set the method for process starting, aka the "actor
     spawning backend".
@@ -96,34 +92,30 @@ def try_set_start_method(
     ``subprocess.Popen``.
 
     '''
-    import multiprocessing as mp
     global _ctx
     global _spawn_method
 
-    mp_methods = mp.get_all_start_methods()
-    if 'fork' in mp_methods:
+    methods = mp.get_all_start_methods()
+    if 'fork' in methods:
         # forking is incompatible with ``trio``s global task tree
-        mp_methods.remove('fork')
+        methods.remove('fork')
 
-    match key:
-        case 'mp_forkserver':
-            from . import _forkserver_override
-            _forkserver_override.override_stdlib()
-            _ctx = mp.get_context('forkserver')
+    # supported on all platforms
+    methods += ['trio']
 
-        case 'mp_spawn':
-            _ctx = mp.get_context('spawn')
+    if name not in methods:
+        raise ValueError(
+            f"Spawn method `{name}` is invalid please choose one of {methods}"
+        )
+    elif name == 'forkserver':
+        _forkserver_override.override_stdlib()
+        _ctx = mp.get_context(name)
+    elif name == 'trio':
+        _ctx = None
+    else:
+        _ctx = mp.get_context(name)
 
-        case 'trio':
-            _ctx = None
-
-        case _:
-            raise ValueError(
-                f'Spawn method `{key}` is invalid!\n'
-                f'Please choose one of {SpawnMethodKey}'
-            )
-
-    _spawn_method = key
+    _spawn_method = name
     return _ctx
 
 
@@ -139,7 +131,6 @@ async def exhaust_portal(
     If the main task is an async generator do our best to consume
     what's left of it.
     '''
-    __tracebackhide__ = True
     try:
         log.debug(f"Waiting on final result from {actor.uid}")
 
@@ -147,11 +138,8 @@ async def exhaust_portal(
         # always be established and shutdown using a context manager api
         final = await portal.result()
 
-    except (
-        Exception,
-        BaseExceptionGroup,
-    ) as err:
-        # we reraise in the parent task via a ``BaseExceptionGroup``
+    except (Exception, trio.MultiError) as err:
+        # we reraise in the parent task via a ``trio.MultiError``
         return err
     except trio.Cancelled as err:
         # lol, of course we need this too ;P
@@ -167,7 +155,7 @@ async def cancel_on_completion(
 
     portal: Portal,
     actor: Actor,
-    errors: dict[tuple[str, str], Exception],
+    errors: Dict[Tuple[str, str], Exception],
 
 ) -> None:
     '''
@@ -179,7 +167,7 @@ async def cancel_on_completion(
     '''
     # 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
+    # a MultiError and we still send out a cancel request
     result = await exhaust_portal(portal, actor)
     if isinstance(result, Exception):
         errors[actor.uid] = result
@@ -199,37 +187,16 @@ async def cancel_on_completion(
 async def do_hard_kill(
     proc: trio.Process,
     terminate_after: int = 3,
-
 ) -> None:
     # 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
-        # (in 0.20.0) ``trio._subrocess.Process.aclose()``, orig doc
-        # string:
-        #
-        # Close any pipes we have to the process (both input and output)
-        # and wait for it to exit. If cancelled, kills the process and
-        # waits for it to finish exiting before propagating the
-        # cancellation.
-        with trio.CancelScope(shield=True):
-            if proc.stdin is not None:
-                await proc.stdin.aclose()
-            if proc.stdout is not None:
-                await proc.stdout.aclose()
-            if proc.stderr is not None:
-                await proc.stderr.aclose()
-        try:
-            await proc.wait()
-        finally:
-            if proc.returncode is None:
-                proc.kill()
-                with trio.CancelScope(shield=True):
-                    await proc.wait()
+        # NOTE: This ``__aexit__()`` shields internally.
+        async with proc:  # calls ``trio.Process.aclose()``
+            log.debug(f"Terminating {proc}")
 
     if cs.cancelled_caught:
         # XXX: should pretty much never get here unless we have
@@ -280,65 +247,29 @@ async def soft_wait(
 
             if proc.poll() is None:  # type: ignore
                 log.warning(
-                    'Actor still alive after cancel request:\n'
-                    f'{uid}'
-                )
+                    f'Process still alive after cancel request:\n{uid}')
 
                 n.cancel_scope.cancel()
         raise
 
 
 async def new_proc(
+
     name: str,
-    actor_nursery: ActorNursery,
+    actor_nursery: 'ActorNursery',  # type: ignore  # noqa
     subactor: Actor,
-    errors: dict[tuple[str, str], Exception],
+    errors: Dict[Tuple[str, str], Exception],
 
     # passed through to actor main
-    bind_addr: tuple[str, int],
-    parent_addr: tuple[str, int],
-    _runtime_vars: dict[str, Any],  # serialized and sent to _child
+    bind_addr: Tuple[str, int],
+    parent_addr: Tuple[str, int],
+    _runtime_vars: Dict[str, Any],  # serialized and sent to _child
 
     *,
 
     infect_asyncio: bool = False,
     task_status: TaskStatus[Portal] = trio.TASK_STATUS_IGNORED
 
-) -> None:
-
-    # lookup backend spawning target
-    target = _methods[_spawn_method]
-
-    # mark the new actor with the global spawn method
-    subactor._spawn_method = _spawn_method
-
-    await target(
-        name,
-        actor_nursery,
-        subactor,
-        errors,
-        bind_addr,
-        parent_addr,
-        _runtime_vars,  # run time vars
-        infect_asyncio=infect_asyncio,
-        task_status=task_status,
-    )
-
-
-async def trio_proc(
-    name: str,
-    actor_nursery: ActorNursery,
-    subactor: Actor,
-    errors: dict[tuple[str, str], Exception],
-
-    # passed through to actor main
-    bind_addr: tuple[str, int],
-    parent_addr: tuple[str, int],
-    _runtime_vars: dict[str, Any],  # serialized and sent to _child
-    *,
-    infect_asyncio: bool = False,
-    task_status: TaskStatus[Portal] = trio.TASK_STATUS_IGNORED
-
 ) -> None:
     '''
     Create a new ``Process`` using a "spawn method" as (configured using
@@ -348,191 +279,188 @@ async def trio_proc(
     here is to be considered the core supervision strategy.
 
     '''
-    spawn_cmd = [
-        sys.executable,
-        "-m",
-        # Hardcode this (instead of using ``_child.__name__`` to avoid a
-        # double import warning: https://stackoverflow.com/a/45070583
-        "tractor._child",
-        # We provide the child's unique identifier on this exec/spawn
-        # line for debugging purposes when viewing the process tree from
-        # the OS; it otherwise can be passed via the parent channel if
-        # we prefer in the future (for privacy).
-        "--uid",
-        str(subactor.uid),
-        # Address the child must connect to on startup
-        "--parent_addr",
-        str(parent_addr)
-    ]
+    # mark the new actor with the global spawn method
+    subactor._spawn_method = _spawn_method
+    uid = subactor.uid
 
-    if subactor.loglevel:
-        spawn_cmd += [
-            "--loglevel",
-            subactor.loglevel
+    if _spawn_method == 'trio':
+        spawn_cmd = [
+            sys.executable,
+            "-m",
+            # Hardcode this (instead of using ``_child.__name__`` to avoid a
+            # double import warning: https://stackoverflow.com/a/45070583
+            "tractor._child",
+            # We provide the child's unique identifier on this exec/spawn
+            # line for debugging purposes when viewing the process tree from
+            # the OS; it otherwise can be passed via the parent channel if
+            # we prefer in the future (for privacy).
+            "--uid",
+            str(subactor.uid),
+            # Address the child must connect to on startup
+            "--parent_addr",
+            str(parent_addr)
         ]
-    # Tell child to run in guest mode on top of ``asyncio`` loop
-    if infect_asyncio:
-        spawn_cmd.append("--asyncio")
 
-    cancelled_during_spawn: bool = False
-    proc: trio.Process | None = None
-    try:
+        if subactor.loglevel:
+            spawn_cmd += [
+                "--loglevel",
+                subactor.loglevel
+            ]
+        # Tell child to run in guest mode on top of ``asyncio`` loop
+        if infect_asyncio:
+            spawn_cmd.append("--asyncio")
+
+        cancelled_during_spawn: bool = False
+        proc: Optional[trio.Process] = None
         try:
-            # TODO: needs ``trio_typing`` patch?
-            proc = await trio.lowlevel.open_process(spawn_cmd)
+            try:
+                proc = await trio.open_process(spawn_cmd)
 
-            log.runtime(f"Started {proc}")
+                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)
+                # 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)
 
-        except trio.Cancelled:
-            cancelled_during_spawn = True
-            # we may cancel before the child connects back in which
-            # case avoid clobbering the pdb tty.
-            if debug_mode():
-                with trio.CancelScope(shield=True):
-                    # don't clobber an ongoing pdb
-                    if is_root_process():
-                        await maybe_wait_for_debugger()
+            except trio.Cancelled:
+                cancelled_during_spawn = True
+                # we may cancel before the child connects back in which
+                # case avoid clobbering the pdb tty.
+                if debug_mode():
+                    with trio.CancelScope(shield=True):
+                        # don't clobber an ongoing pdb
+                        if is_root_process():
+                            await maybe_wait_for_debugger()
 
-                    elif proc is not None:
-                        async with acquire_debug_lock(subactor.uid):
-                            # soft wait on the proc to terminate
-                            with trio.move_on_after(0.5):
-                                await proc.wait()
-            raise
+                        elif proc is not None:
+                            async with acquire_debug_lock(uid):
+                                # soft wait on the proc to terminate
+                                with trio.move_on_after(0.5):
+                                    await proc.wait()
+                raise
 
-        # a sub-proc ref **must** exist now
-        assert proc
+            portal = Portal(chan)
+            actor_nursery._children[subactor.uid] = (
+                subactor, proc, portal)
 
-        portal = Portal(chan)
-        actor_nursery._children[subactor.uid] = (
-            subactor,
-            proc,
-            portal,
-        )
+            # send additional init params
+            await chan.send({
+                "_parent_main_data": subactor._parent_main_data,
+                "enable_modules": subactor.enable_modules,
+                "_arb_addr": subactor._arb_addr,
+                "bind_host": bind_addr[0],
+                "bind_port": bind_addr[1],
+                "_runtime_vars": _runtime_vars,
+            })
 
-        # send additional init params
-        await chan.send({
-            "_parent_main_data": subactor._parent_main_data,
-            "enable_modules": subactor.enable_modules,
-            "_arb_addr": subactor._arb_addr,
-            "bind_host": bind_addr[0],
-            "bind_port": bind_addr[1],
-            "_runtime_vars": _runtime_vars,
-        })
+            # track subactor in current nursery
+            curr_actor = current_actor()
+            curr_actor._actoruid2nursery[subactor.uid] = actor_nursery
 
-        # track subactor in current nursery
-        curr_actor = current_actor()
-        curr_actor._actoruid2nursery[subactor.uid] = actor_nursery
+            # resume caller at next checkpoint now that child is up
+            task_status.started(portal)
 
-        # resume caller at next checkpoint now that child is up
-        task_status.started(portal)
-
-        # wait for ActorNursery.wait() to be called
-        with trio.CancelScope(shield=True):
-            await actor_nursery._join_procs.wait()
-
-        async with trio.open_nursery() as nursery:
-            if portal in actor_nursery._cancel_after_result_on_exit:
-                nursery.start_soon(
-                    cancel_on_completion,
-                    portal,
-                    subactor,
-                    errors
-                )
-
-            # This is a "soft" (cancellable) join/reap which
-            # will remote cancel the actor on a ``trio.Cancelled``
-            # condition.
-            await soft_wait(
-                proc,
-                trio.Process.wait,
-                portal
-            )
-
-            # cancel result waiter that may have been spawned in
-            # tandem if not done already
-            log.warning(
-                "Cancelling existing result waiter task for "
-                f"{subactor.uid}")
-            nursery.cancel_scope.cancel()
-
-    finally:
-        # XXX NOTE XXX: The "hard" reap since no actor zombies are
-        # allowed! Do this **after** cancellation/teardown to avoid
-        # killing the process too early.
-        if proc:
-            log.cancel(f'Hard reap sequence starting for {subactor.uid}')
+            # wait for ActorNursery.wait() to be called
             with trio.CancelScope(shield=True):
+                await actor_nursery._join_procs.wait()
 
-                # don't clobber an ongoing pdb
-                if cancelled_during_spawn:
-                    # Try again to avoid TTY clobbering.
-                    async with acquire_debug_lock(subactor.uid):
-                        with trio.move_on_after(0.5):
-                            await proc.wait()
-
-                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),
+            async with trio.open_nursery() as nursery:
+                if portal in actor_nursery._cancel_after_result_on_exit:
+                    nursery.start_soon(
+                        cancel_on_completion,
+                        portal,
+                        subactor,
+                        errors
                     )
 
-                if proc.poll() is None:
-                    log.cancel(f"Attempting to hard kill {proc}")
-                    await do_hard_kill(proc)
+                # This is a "soft" (cancellable) join/reap which
+                # will remote cancel the actor on a ``trio.Cancelled``
+                # condition.
+                await soft_wait(
+                    proc,
+                    trio.Process.wait,
+                    portal
+                )
 
-                log.debug(f"Joined {proc}")
-        else:
-            log.warning('Nursery cancelled before sub-proc started')
+                # cancel result waiter that may have been spawned in
+                # tandem if not done already
+                log.warning(
+                    "Cancelling existing result waiter task for "
+                    f"{subactor.uid}")
+                nursery.cancel_scope.cancel()
 
-        if not cancelled_during_spawn:
-            # pop child entry to indicate we no longer managing this
-            # subactor
-            actor_nursery._children.pop(subactor.uid)
+        finally:
+            # The "hard" reap since no actor zombies are allowed!
+            # XXX: do this **after** cancellation/tearfown to avoid
+            # killing the process too early.
+            if proc:
+                log.cancel(f'Hard reap sequence starting for {uid}')
+                with trio.CancelScope(shield=True):
+
+                    # don't clobber an ongoing pdb
+                    if cancelled_during_spawn:
+                        # Try again to avoid TTY clobbering.
+                        async with acquire_debug_lock(uid):
+                            with trio.move_on_after(0.5):
+                                await proc.wait()
+
+                    if is_root_process():
+                        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 do_hard_kill(proc)
+
+                    log.debug(f"Joined {proc}")
+            else:
+                log.warning('Nursery cancelled before sub-proc started')
+
+            if not cancelled_during_spawn:
+                # pop child entry to indicate we no longer managing this
+                # subactor
+                actor_nursery._children.pop(subactor.uid)
+
+    else:
+        # `multiprocessing`
+        # async with trio.open_nursery() as nursery:
+        await mp_new_proc(
+            name=name,
+            actor_nursery=actor_nursery,
+            subactor=subactor,
+            errors=errors,
+
+            # passed through to actor main
+            bind_addr=bind_addr,
+            parent_addr=parent_addr,
+            _runtime_vars=_runtime_vars,
+            infect_asyncio=infect_asyncio,
+            task_status=task_status,
+        )
 
 
-async def mp_proc(
+async def mp_new_proc(
+
     name: str,
-    actor_nursery: ActorNursery,  # type: ignore  # noqa
+    actor_nursery: 'ActorNursery',  # type: ignore  # noqa
     subactor: Actor,
-    errors: dict[tuple[str, str], Exception],
+    errors: Dict[Tuple[str, str], Exception],
     # passed through to actor main
-    bind_addr: tuple[str, int],
-    parent_addr: tuple[str, int],
-    _runtime_vars: dict[str, Any],  # serialized and sent to _child
+    bind_addr: Tuple[str, int],
+    parent_addr: Tuple[str, int],
+    _runtime_vars: Dict[str, Any],  # serialized and sent to _child
     *,
     infect_asyncio: bool = False,
     task_status: TaskStatus[Portal] = trio.TASK_STATUS_IGNORED
 
 ) -> None:
 
-    # uggh zone
-    try:
-        from multiprocessing import semaphore_tracker  # type: ignore
-        resource_tracker = semaphore_tracker
-        resource_tracker._resource_tracker = resource_tracker._semaphore_tracker  # noqa
-    except ImportError:
-        # 3.8 introduces a more general version that also tracks shared mems
-        from multiprocessing import resource_tracker  # type: ignore
-
     assert _ctx
     start_method = _ctx.get_start_method()
     if start_method == 'forkserver':
-
-        from multiprocessing import forkserver  # type: ignore
         # XXX do our hackery on the stdlib to avoid multiple
         # forkservers (one at each subproc layer).
         fs = forkserver._forkserver
@@ -544,24 +472,23 @@ async def mp_proc(
             # forkserver.set_forkserver_preload(enable_modules)
             forkserver.ensure_running()
             fs_info = (
-                fs._forkserver_address,  # type: ignore  # noqa
-                fs._forkserver_alive_fd,  # type: ignore  # noqa
+                fs._forkserver_address,
+                fs._forkserver_alive_fd,
                 getattr(fs, '_forkserver_pid', None),
                 getattr(
                     resource_tracker._resource_tracker, '_pid', None),
                 resource_tracker._resource_tracker._fd,
             )
-        else:  # request to forkerserver to fork a new child
+        else:
             assert curr_actor._forkserver_info
             fs_info = (
-                fs._forkserver_address,  # type: ignore  # noqa
-                fs._forkserver_alive_fd,  # type: ignore  # noqa
-                fs._forkserver_pid,  # type: ignore  # noqa
+                fs._forkserver_address,
+                fs._forkserver_alive_fd,
+                fs._forkserver_pid,
                 resource_tracker._resource_tracker._pid,
                 resource_tracker._resource_tracker._fd,
              ) = curr_actor._forkserver_info
     else:
-        # spawn method
         fs_info = (None, None, None, None, None)
 
     proc: mp.Process = _ctx.Process(  # type: ignore
@@ -570,7 +497,7 @@ async def mp_proc(
             subactor,
             bind_addr,
             fs_info,
-            _spawn_method,
+            start_method,
             parent_addr,
             infect_asyncio,
         ),
@@ -664,16 +591,4 @@ async def mp_proc(
         log.debug(f"Joined {proc}")
 
         # pop child entry to indicate we are no longer managing subactor
-        actor_nursery._children.pop(subactor.uid)
-
-        # TODO: prolly report to ``mypy`` how this causes all sorts of
-        # false errors..
-        # subactor, proc, portal = actor_nursery._children.pop(subactor.uid)
-
-
-# proc spawning backend target map
-_methods: dict[SpawnMethodKey, Callable] = {
-    'trio': trio_proc,
-    'mp_spawn': mp_proc,
-    'mp_forkserver': mp_proc,
-}
+        subactor, proc, portal = actor_nursery._children.pop(subactor.uid)

tractor/_state.py

@@ -18,10 +18,9 @@
 Per process state
 
 """
-from typing import (
-    Optional,
-    Any,
-)
+from typing import Optional, Dict, Any
+from collections.abc import Mapping
+import multiprocessing as mp
 
 import trio
 
@@ -29,7 +28,7 @@ from ._exceptions import NoRuntime
 
 
 _current_actor: Optional['Actor'] = None  # type: ignore # noqa
-_runtime_vars: dict[str, Any] = {
+_runtime_vars: Dict[str, Any] = {
     '_debug_mode': False,
     '_is_root': False,
     '_root_mailbox': (None, None)
@@ -45,10 +44,33 @@ def current_actor(err_on_no_runtime: bool = True) -> 'Actor':  # type: ignore #
     return _current_actor
 
 
+_conc_name_getters = {
+    'task': trio.lowlevel.current_task,
+    'actor': current_actor
+}
+
+
+class ActorContextInfo(Mapping):
+    "Dyanmic lookup for local actor and task names"
+    _context_keys = ('task', 'actor')
+
+    def __len__(self):
+        return len(self._context_keys)
+
+    def __iter__(self):
+        return iter(self._context_keys)
+
+    def __getitem__(self, key: str) -> str:
+        try:
+            return _conc_name_getters[key]().name  # type: ignore
+        except RuntimeError:
+            # no local actor/task context initialized yet
+            return f'no {key} context'
+
+
 def is_main_process() -> bool:
     """Bool determining if this actor is running in the top-most process.
     """
-    import multiprocessing as mp
     return mp.current_process().name == 'MainProcess'
 
 

tractor/_streaming.py

@@ -23,10 +23,8 @@ import inspect
 from contextlib import asynccontextmanager
 from dataclasses import dataclass
 from typing import (
-    Any,
-    Optional,
-    Callable,
-    AsyncGenerator,
+    Any, Optional, Callable,
+    AsyncGenerator, Dict,
     AsyncIterator
 )
 
@@ -50,13 +48,12 @@ log = get_logger(__name__)
 # - use __slots__ on ``Context``?
 
 
-class MsgStream(trio.abc.Channel):
+class ReceiveMsgStream(trio.abc.ReceiveChannel):
     '''
-    A bidirectional message stream for receiving logically sequenced
-    values over an inter-actor IPC ``Channel``.
-
-    This is the type returned to a local task which entered either
-    ``Portal.open_stream_from()`` or ``Context.open_stream()``.
+    A IPC message stream for receiving logically sequenced values over
+    an inter-actor ``Channel``. This is the type returned to a local
+    task which entered either ``Portal.open_stream_from()`` or
+    ``Context.open_stream()``.
 
     Termination rules:
 
@@ -98,9 +95,6 @@ class MsgStream(trio.abc.Channel):
         if self._eoc:
             raise trio.EndOfChannel
 
-        if self._closed:
-            raise trio.ClosedResourceError('This stream was closed')
-
         try:
             msg = await self._rx_chan.receive()
             return msg['yield']
@@ -114,9 +108,6 @@ class MsgStream(trio.abc.Channel):
             # - '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")
 
@@ -196,6 +187,7 @@ class MsgStream(trio.abc.Channel):
             return
 
         self._eoc = True
+        self._closed = True
 
         # NOTE: this is super subtle IPC messaging stuff:
         # Relay stop iteration to far end **iff** we're
@@ -212,32 +204,29 @@ class MsgStream(trio.abc.Channel):
 
         # In the bidirectional case, `Context.open_stream()` will create
         # the `Actor._cids2qs` entry from a call to
-        # `Actor.get_context()` and will call us here to send the stop
-        # msg in ``__aexit__()`` on teardown.
-        try:
-            # NOTE: if this call is cancelled we expect this end to
-            # handle as though the stop was never sent (though if it
-            # was it shouldn't matter since it's unlikely a user
-            # will try to re-use a stream after attemping to close
-            # it).
-            with trio.CancelScope(shield=True):
-                await self._ctx.send_stop()
+        # `Actor.get_context()` and will send the stop message in
+        # ``__aexit__()`` on teardown so it **does not** need to be
+        # called here.
+        if not self._ctx._portal:
+            # Only for 2 way streams can we can send stop from the
+            # caller side.
+            try:
+                # NOTE: if this call is cancelled we expect this end to
+                # handle as though the stop was never sent (though if it
+                # was it shouldn't matter since it's unlikely a user
+                # will try to re-use a stream after attemping to close
+                # it).
+                with trio.CancelScope(shield=True):
+                    await self._ctx.send_stop()
 
-        except (
-            trio.BrokenResourceError,
-            trio.ClosedResourceError
-        ):
-            # 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}'
-            )
-
-        self._closed = True
+            except (
+                trio.BrokenResourceError,
+                trio.ClosedResourceError
+            ):
+                # the underlying channel may already have been pulled
+                # in which case our stop message is meaningless since
+                # it can't traverse the transport.
+                log.debug(f'Channel for {self} was already closed')
 
         # Do we close the local mem chan ``self._rx_chan`` ??!?
 
@@ -280,8 +269,7 @@ class MsgStream(trio.abc.Channel):
         self,
 
     ) -> AsyncIterator[BroadcastReceiver]:
-        '''
-        Allocate and return a ``BroadcastReceiver`` which delegates
+        '''Allocate and return a ``BroadcastReceiver`` which delegates
         to this message stream.
 
         This allows multiple local tasks to receive each their own copy
@@ -318,15 +306,15 @@ class MsgStream(trio.abc.Channel):
         async with self._broadcaster.subscribe() as bstream:
             assert bstream.key != self._broadcaster.key
             assert bstream._recv == self._broadcaster._recv
-
-            # NOTE: we patch on a `.send()` to the bcaster so that the
-            # caller can still conduct 2-way streaming using this
-            # ``bstream`` handle transparently as though it was the msg
-            # stream instance.
-            bstream.send = self.send  # type: ignore
-
             yield bstream
 
+
+class MsgStream(ReceiveMsgStream, trio.abc.Channel):
+    '''
+    Bidirectional message stream for use within an inter-actor actor
+    ``Context```.
+
+    '''
     async def send(
         self,
         data: Any
@@ -381,8 +369,6 @@ class Context:
 
     # 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
@@ -407,7 +393,7 @@ class Context:
 
     async def _maybe_raise_from_remote_msg(
         self,
-        msg: dict[str, Any],
+        msg: Dict[str, Any],
 
     ) -> None:
         '''
@@ -464,11 +450,7 @@ class Context:
                 if not self._scope_nursery._closed:  # type: ignore
                     self._scope_nursery.start_soon(raiser)
 
-    async def cancel(
-        self,
-        msg: Optional[str] = None,
-
-    ) -> None:
+    async def cancel(self) -> None:
         '''
         Cancel this inter-actor-task context.
 
@@ -477,8 +459,6 @@ class Context:
 
         '''
         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}')
 
@@ -515,10 +495,8 @@ class Context:
                     log.cancel(
                         "Timed out on cancelling remote task "
                         f"{cid} for {self._portal.channel.uid}")
-
-        # callee side remote task
         else:
-            self._cancel_msg = msg
+            # callee side remote task
 
             # TODO: should we have an explicit cancel message
             # or is relaying the local `trio.Cancelled` as an
@@ -603,38 +581,30 @@ class Context:
         async with MsgStream(
             ctx=self,
             rx_chan=ctx._recv_chan,
-        ) as stream:
+        ) as rchan:
 
             if self._portal:
-                self._portal._streams.add(stream)
+                self._portal._streams.add(rchan)
 
             try:
                 self._stream_opened = True
 
-                # XXX: do we need this?
-                # ensure we aren't cancelled before yielding the stream
+                # ensure we aren't cancelled before delivering
+                # the stream
                 # await trio.lowlevel.checkpoint()
-                yield stream
+                yield rchan
 
-                # NOTE: Make the stream "one-shot use".  On exit, signal
+                # XXX: Make the stream "one-shot use".  On exit, signal
                 # ``trio.EndOfChannel``/``StopAsyncIteration`` to the
                 # far end.
-                await stream.aclose()
+                await self.send_stop()
 
             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}'
-                        )
+                    self._portal._streams.remove(rchan)
 
     async def result(self) -> Any:
-        '''
-        From a caller side, wait for and return the final result from
+        '''From a caller side, wait for and return the final result from
         the callee side task.
 
         '''

tractor/_supervise.py

@@ -18,23 +18,20 @@
 ``trio`` inspired apis and helpers
 
 """
-from contextlib import asynccontextmanager as acm
 from functools import partial
 import inspect
-from typing import (
-    Optional,
-    TYPE_CHECKING,
-)
+import multiprocessing as mp
+from typing import Tuple, List, Dict, Optional
 import typing
 import warnings
 
-from exceptiongroup import BaseExceptionGroup
 import trio
+from async_generator import asynccontextmanager
 
 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 ._actor import Actor
 from ._portal import Portal
 from ._exceptions import is_multi_cancelled
 from ._root import open_root_actor
@@ -42,12 +39,9 @@ from . import _state
 from . import _spawn
 
 
-if TYPE_CHECKING:
-    import multiprocessing as mp
-
 log = get_logger(__name__)
 
-_default_bind_addr: tuple[str, int] = ('127.0.0.1', 0)
+_default_bind_addr: Tuple[str, int] = ('127.0.0.1', 0)
 
 
 class ActorNursery:
@@ -83,19 +77,15 @@ class ActorNursery:
         actor: Actor,
         ria_nursery: trio.Nursery,
         da_nursery: trio.Nursery,
-        errors: dict[tuple[str, str], BaseException],
+        errors: Dict[Tuple[str, str], Exception],
     ) -> None:
         # self.supervisor = supervisor  # TODO
         self._actor: Actor = actor
         self._ria_nursery = ria_nursery
         self._da_nursery = da_nursery
-        self._children: dict[
-            tuple[str, str],
-            tuple[
-                Actor,
-                trio.Process | mp.Process,
-                Optional[Portal],
-            ]
+        self._children: Dict[
+            Tuple[str, str],
+            Tuple[Actor, mp.Process, Optional[Portal]]
         ] = {}
         # portals spawned with ``run_in_actor()`` are
         # cancelled when their "main" result arrives
@@ -110,12 +100,12 @@ class ActorNursery:
         self,
         name: str,
         *,
-        bind_addr: tuple[str, int] = _default_bind_addr,
-        rpc_module_paths: list[str] | None = None,
-        enable_modules: list[str] | None = None,
-        loglevel: str | None = None,  # set log level per subactor
-        nursery: trio.Nursery | None = None,
-        debug_mode: Optional[bool] | None = None,
+        bind_addr: Tuple[str, int] = _default_bind_addr,
+        rpc_module_paths: List[str] = None,
+        enable_modules: List[str] = None,
+        loglevel: str = None,  # set log level per subactor
+        nursery: trio.Nursery = None,
+        debug_mode: Optional[bool] = None,
         infect_asyncio: bool = False,
     ) -> Portal:
         '''
@@ -181,10 +171,10 @@ class ActorNursery:
         *,
 
         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
+        bind_addr: Tuple[str, int] = _default_bind_addr,
+        rpc_module_paths: Optional[List[str]] = None,
+        enable_modules: List[str] = None,
+        loglevel: str = None,  # set log level per subactor
         infect_asyncio: bool = False,
 
         **kwargs,  # explicit args to ``fn``
@@ -295,17 +285,13 @@ class ActorNursery:
         self._join_procs.set()
 
 
-@acm
+@asynccontextmanager
 async def _open_and_supervise_one_cancels_all_nursery(
     actor: Actor,
-
 ) -> typing.AsyncGenerator[ActorNursery, None]:
 
-    # TODO: yay or nay?
-    __tracebackhide__ = True
-
     # the collection of errors retreived from spawned sub-actors
-    errors: dict[tuple[str, str], BaseException] = {}
+    errors: Dict[Tuple[str, str], Exception] = {}
 
     # This is the outermost level "deamon actor" nursery. It is awaited
     # **after** the below inner "run in actor nursery". This allows for
@@ -338,17 +324,19 @@ async def _open_and_supervise_one_cancels_all_nursery(
                     # after we yield upwards
                     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(
                         f"Waiting on subactors {anursery._children} "
                         "to complete"
                     )
+
+                    # Last bit before first nursery block ends in the case
+                    # where we didn't error in the caller's scope
+
+                    # signal all process monitor tasks to conduct
+                    # hard join phase.
                     anursery._join_procs.set()
 
-                except BaseException as inner_err:
-                    errors[actor.uid] = inner_err
+                except BaseException as err:
 
                     # If we error in the root but the debugger is
                     # engaged we don't want to prematurely kill (and
@@ -365,42 +353,49 @@ async def _open_and_supervise_one_cancels_all_nursery(
                     # worry more are coming).
                     anursery._join_procs.set()
 
-                    # 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(inner_err)
-                        if etype in (
-                            trio.Cancelled,
-                            KeyboardInterrupt
-                        ) or (
-                            is_multi_cancelled(inner_err)
-                        ):
-                            log.cancel(
-                                f"Nursery for {current_actor().uid} "
-                                f"was cancelled with {etype}")
-                        else:
-                            log.exception(
-                                f"Nursery for {current_actor().uid} "
-                                f"errored with")
+                    try:
+                        # 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(err)
+                            if etype in (
+                                trio.Cancelled,
+                                KeyboardInterrupt
+                            ) or (
+                                is_multi_cancelled(err)
+                            ):
+                                log.cancel(
+                                    f"Nursery for {current_actor().uid} "
+                                    f"was cancelled with {etype}")
+                            else:
+                                log.exception(
+                                    f"Nursery for {current_actor().uid} "
+                                    f"errored with {err}, ")
 
-                        # cancel all subactors
-                        await anursery.cancel()
+                            # cancel all subactors
+                            await anursery.cancel()
 
-            # ria_nursery scope end
+                    except trio.MultiError as merr:
+                        # If we receive additional errors while waiting on
+                        # remaining subactors that were cancelled,
+                        # aggregate those errors with the original error
+                        # that triggered this teardown.
+                        if err not in merr.exceptions:
+                            raise trio.MultiError(merr.exceptions + [err])
+                    else:
+                        raise
 
-        # TODO: this is the handler around the ``.run_in_actor()``
-        # nursery. Ideally we can drop this entirely in the future as
-        # the whole ``.run_in_actor()`` API should be built "on top of"
-        # this lower level spawn-request-cancel "daemon actor" API where
-        # a local in-actor task nursery is used with one-to-one task
-        # + `await Portal.run()` calls and the results/errors are
-        # handled directly (inline) and errors by the local nursery.
+                # ria_nursery scope end
+
+        # XXX: do we need a `trio.Cancelled` catch here as well?
+        # this is the catch around the ``.run_in_actor()`` nursery
         except (
+
             Exception,
-            BaseExceptionGroup,
+            trio.MultiError,
             trio.Cancelled
 
         ) as err:
@@ -432,20 +427,18 @@ async def _open_and_supervise_one_cancels_all_nursery(
                     with trio.CancelScope(shield=True):
                         await anursery.cancel()
 
-                # use `BaseExceptionGroup` as needed
+                # use `MultiError` as needed
                 if len(errors) > 1:
-                    raise BaseExceptionGroup(
-                        'tractor.ActorNursery errored with',
-                        tuple(errors.values()),
-                    )
+                    raise trio.MultiError(tuple(errors.values()))
                 else:
                     raise list(errors.values())[0]
 
-        # da_nursery scope end - nursery checkpoint
-    # final exit
+        # ria_nursery scope end - nursery checkpoint
+
+    # after nursery exit
 
 
-@acm
+@asynccontextmanager
 async def open_nursery(
     **kwargs,
 

tractor/experimental/_pubsub.py

@@ -1,332 +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/>.
-
-"""
-Single target entrypoint, remote-task, dynamic (no push if no consumer)
-pubsub API using async an generator which muli-plexes to consumers by
-key.
-
-NOTE: this module is likely deprecated by the new bi-directional streaming
-support provided by ``tractor.Context.open_stream()`` and friends.
-
-"""
-from __future__ import annotations
-import inspect
-import typing
-from typing import (
-    Any,
-    Callable,
-)
-from functools import partial
-from async_generator import aclosing
-
-import trio
-import wrapt
-
-from ..log import get_logger
-from .._streaming import Context
-
-
-__all__ = ['pub']
-
-log = get_logger('messaging')
-
-
-async def fan_out_to_ctxs(
-    pub_async_gen_func: typing.Callable,  # it's an async gen ... gd mypy
-    topics2ctxs: dict[str, list],
-    packetizer: typing.Callable | None = None,
-) -> None:
-    '''
-    Request and fan out quotes to each subscribed actor channel.
-
-    '''
-
-    def get_topics():
-        return tuple(topics2ctxs.keys())
-
-    agen = pub_async_gen_func(get_topics=get_topics)
-
-    async with aclosing(agen) as pub_gen:
-
-        async for published in pub_gen:
-
-            ctx_payloads: list[tuple[Context, Any]] = []
-
-            for topic, data in published.items():
-                log.debug(f"publishing {topic, data}")
-
-                # build a new dict packet or invoke provided packetizer
-                if packetizer is None:
-                    packet = {topic: data}
-
-                else:
-                    packet = packetizer(topic, data)
-
-                for ctx in topics2ctxs.get(topic, list()):
-                    ctx_payloads.append((ctx, packet))
-
-            if not ctx_payloads:
-                log.debug(f"Unconsumed values:\n{published}")
-
-            # deliver to each subscriber (fan out)
-            if ctx_payloads:
-                for ctx, payload in ctx_payloads:
-                    try:
-                        await ctx.send_yield(payload)
-                    except (
-                        # That's right, anything you can think of...
-                        trio.ClosedResourceError, ConnectionResetError,
-                        ConnectionRefusedError,
-                    ):
-                        log.warning(f"{ctx.chan} went down?")
-                        for ctx_list in topics2ctxs.values():
-                            try:
-                                ctx_list.remove(ctx)
-                            except ValueError:
-                                continue
-
-            if not get_topics():
-                log.warning(f"No subscribers left for {pub_gen}")
-                break
-
-
-def modify_subs(
-
-    topics2ctxs: dict[str, list[Context]],
-    topics: set[str],
-    ctx: Context,
-
-) -> None:
-    """Absolute symbol subscription list for each quote stream.
-
-    Effectively a symbol subscription api.
-    """
-    log.info(f"{ctx.chan.uid} changed subscription to {topics}")
-
-    # update map from each symbol to requesting client's chan
-    for topic in topics:
-        topics2ctxs.setdefault(topic, list()).append(ctx)
-
-    # remove any existing symbol subscriptions if symbol is not
-    # found in ``symbols``
-    # TODO: this can likely be factored out into the pub-sub api
-    for topic in filter(
-        lambda topic: topic not in topics, topics2ctxs.copy()
-    ):
-        ctx_list = topics2ctxs.get(topic)
-        if ctx_list:
-            try:
-                ctx_list.remove(ctx)
-            except ValueError:
-                pass
-
-        if not ctx_list:
-            # pop empty sets which will trigger bg quoter task termination
-            topics2ctxs.pop(topic)
-
-
-_pub_state: dict[str, dict] = {}
-_pubtask2lock: dict[str, trio.StrictFIFOLock] = {}
-
-
-def pub(
-    wrapped: typing.Callable | None = None,
-    *,
-    tasks: set[str] = set(),
-):
-    """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
-    each caller. The ``tasks: set[str]`` argument to the decorator
-    specifies the names of the mutex set of publisher tasks.  When the
-    publisher function is called, an argument ``task_name`` must be
-    passed to specify which task (of the set named in ``tasks``) should
-    be used. This allows for using the same publisher with different
-    input (arguments) without allowing more concurrent tasks then
-    necessary.
-
-    Values yielded from the decorated async generator must be
-    ``dict[str, dict[str, Any]]`` where the fist level key is the topic
-    string and determines which subscription the packet will be
-    delivered to and the value is a packet ``dict[str, Any]`` by default
-    of the form:
-
-    .. ::python
-
-        {topic: str: value: Any}
-
-    The caller can instead opt to pass a ``packetizer`` callback who's
-    return value will be delivered as the published response.
-
-    The decorated async generator function must accept an argument
-    :func:`get_topics` which dynamically returns the tuple of current
-    subscriber topics:
-
-    .. code:: python
-
-        from tractor.msg import pub
-
-        @pub(tasks={'source_1', 'source_2'})
-        async def pub_service(get_topics):
-            data = await web_request(endpoints=get_topics())
-            for item in data:
-                yield data['key'], data
-
-
-    The publisher must be called passing in the following arguments:
-    - ``topics: set[str]`` the topic sequence or "subscriptions"
-    - ``task_name: str`` the task to use (if ``tasks`` was passed)
-    - ``ctx: Context`` the tractor context (only needed if calling the
-      pub func without a nursery, otherwise this is provided implicitly)
-    - packetizer: ``Callable[[str, Any], Any]`` a callback who receives
-      the topic and value from the publisher function each ``yield`` such that
-      whatever is returned is sent as the published value to subscribers of
-      that topic.  By default this is a dict ``{topic: str: value: Any}``.
-
-    As an example, to make a subscriber call the above function:
-
-    .. code:: python
-
-        from functools import partial
-        import tractor
-
-        async with tractor.open_nursery() as n:
-            portal = n.run_in_actor(
-                'publisher',  # actor name
-                partial(      # func to execute in it
-                    pub_service,
-                    topics=('clicks', 'users'),
-                    task_name='source1',
-                )
-            )
-            async for value in await portal.result():
-                print(f"Subscriber received {value}")
-
-
-    Here, you don't need to provide the ``ctx`` argument since the
-    remote actor provides it automatically to the spawned task. If you
-    were to call ``pub_service()`` directly from a wrapping function you
-    would need to provide this explicitly.
-
-    Remember you only need this if you need *a finite set of tasks*
-    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
-    if wrapped is None:
-        return partial(pub, tasks=tasks)
-
-    task2lock: dict[str, trio.StrictFIFOLock] = {}
-
-    for name in tasks:
-        task2lock[name] = trio.StrictFIFOLock()
-
-    @wrapt.decorator
-    async def wrapper(agen, instance, args, kwargs):
-
-        # XXX: this is used to extract arguments properly as per the
-        # `wrapt` docs
-        async def _execute(
-            ctx: Context,
-            topics: set[str],
-            *args,
-            # *,
-            task_name: str | None = None,  # default: only one task allocated
-            packetizer: Callable | None = None,
-            **kwargs,
-        ):
-            if task_name is None:
-                task_name = trio.lowlevel.current_task().name
-
-            if tasks and task_name not in tasks:
-                raise TypeError(
-                    f"{agen} must be called with a `task_name` named "
-                    f"argument with a value from {tasks}")
-
-            elif not tasks and not task2lock:
-                # add a default root-task lock if none defined
-                task2lock[task_name] = trio.StrictFIFOLock()
-
-            _pubtask2lock.update(task2lock)
-
-            topics = set(topics)
-            lock = _pubtask2lock[task_name]
-
-            all_subs = _pub_state.setdefault('_subs', {})
-            topics2ctxs = all_subs.setdefault(task_name, {})
-
-            try:
-                modify_subs(topics2ctxs, topics, ctx)
-                # block and let existing feed task deliver
-                # stream data until it is cancelled in which case
-                # the next waiting task will take over and spawn it again
-                async with lock:
-                    # no data feeder task yet; so start one
-                    respawn = True
-                    while respawn:
-                        respawn = False
-                        log.info(
-                            f"Spawning data feed task for {funcname}")
-                        try:
-                            # unblocks when no more symbols subscriptions exist
-                            # and the streamer task terminates
-                            await fan_out_to_ctxs(
-                                pub_async_gen_func=partial(
-                                    agen, *args, **kwargs),
-                                topics2ctxs=topics2ctxs,
-                                packetizer=packetizer,
-                            )
-                            log.info(
-                                f"Terminating stream task {task_name or ''}"
-                                f" for {agen.__name__}")
-                        except trio.BrokenResourceError:
-                            log.exception("Respawning failed data feed task")
-                            respawn = True
-            finally:
-                # remove all subs for this context
-                modify_subs(topics2ctxs, set(), ctx)
-
-                # if there are truly no more subscriptions with this broker
-                # drop from broker subs dict
-                if not any(topics2ctxs.values()):
-                    log.info(
-                        f"No more subscriptions for publisher {task_name}")
-
-        # invoke it
-        await _execute(*args, **kwargs)
-
-    funcname = wrapped.__name__
-    if not inspect.isasyncgenfunction(wrapped):
-        raise TypeError(
-            f"Publisher {funcname} must be an async generator function"
-        )
-    if 'get_topics' not in inspect.signature(wrapped).parameters:
-        raise TypeError(
-            f"Publisher async gen {funcname} must define a "
-            "`get_topics` argument"
-        )
-
-    # XXX: manually monkey the wrapped function since
-    # ``wrapt.decorator`` doesn't seem to want to play nice with its
-    # whole "adapter" thing...
-    wrapped._tractor_stream_function = True  # type: ignore
-
-    return wrapper(wrapped)

tractor/log.py

@@ -18,14 +18,12 @@
 Log like a forester!
 
 """
-from collections.abc import Mapping
 import sys
 import logging
 import colorlog  # type: ignore
+from typing import Optional
 
-import trio
-
-from ._state import current_actor
+from ._state import ActorContextInfo
 
 
 _proj_name: str = 'tractor'
@@ -38,8 +36,7 @@ LOG_FORMAT = (
     # "{bold_white}{log_color}{asctime}{reset}"
     "{log_color}{asctime}{reset}"
     " {bold_white}{thin_white}({reset}"
-    "{thin_white}{actor_name}[{actor_uid}], "
-    "{process}, {task}){reset}{bold_white}{thin_white})"
+    "{thin_white}{actor}, {process}, {task}){reset}{bold_white}{thin_white})"
     " {reset}{log_color}[{reset}{bold_log_color}{levelname}{reset}{log_color}]"
     " {log_color}{name}"
     " {thin_white}{filename}{log_color}:{reset}{thin_white}{lineno}{log_color}"
@@ -139,40 +136,9 @@ class StackLevelAdapter(logging.LoggerAdapter):
         )
 
 
-_conc_name_getters = {
-    'task': lambda: trio.lowlevel.current_task().name,
-    'actor': lambda: current_actor(),
-    'actor_name': lambda: current_actor().name,
-    'actor_uid': lambda: current_actor().uid[1][:6],
-}
-
-
-class ActorContextInfo(Mapping):
-    "Dyanmic lookup for local actor and task names"
-    _context_keys = (
-        'task',
-        'actor',
-        'actor_name',
-        'actor_uid',
-    )
-
-    def __len__(self):
-        return len(self._context_keys)
-
-    def __iter__(self):
-        return iter(self._context_keys)
-
-    def __getitem__(self, key: str) -> str:
-        try:
-            return _conc_name_getters[key]()
-        except RuntimeError:
-            # no local actor/task context initialized yet
-            return f'no {key} context'
-
-
 def get_logger(
 
-    name: str | None = None,
+    name: str = None,
     _root_name: str = _proj_name,
 
 ) -> StackLevelAdapter:
@@ -207,7 +173,7 @@ def get_logger(
 
 
 def get_console_log(
-    level: str | None = None,
+    level: str = None,
     **kwargs,
 ) -> logging.LoggerAdapter:
     '''Get the package logger and enable a handler which writes to stderr.

tractor/msg.py

@@ -14,67 +14,309 @@
 # 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.
+"""
+Messaging pattern APIs and helpers.
 
-'''
+NOTE: this module is likely deprecated by the new bi-directional streaming
+support provided by ``tractor.Context.open_stream()`` and friends.
 
-# TODO: integration with our ``enable_modules: list[str]`` caps sys.
+"""
+import inspect
+import typing
+from typing import Dict, Any, Set, Callable, List, Tuple
+from functools import partial
+from async_generator import aclosing
 
-# ``pkgutil.resolve_name()`` internally uses
-# ``importlib.import_module()`` which can be filtered by inserting
-# a ``MetaPathFinder`` into ``sys.meta_path`` (which we could do before
-# entering the ``_runtime.process_messages()`` loop).
-# - https://github.com/python/cpython/blob/main/Lib/pkgutil.py#L645
-# - https://stackoverflow.com/questions/1350466/preventing-python-code-from-importing-certain-modules
-#   - https://stackoverflow.com/a/63320902
-#   - https://docs.python.org/3/library/sys.html#sys.meta_path
+import trio
+import wrapt
 
-# the new "Implicit Namespace Packages" might be relevant?
-# - https://www.python.org/dev/peps/pep-0420/
+from .log import get_logger
+from ._streaming import Context
 
-# add implicit serialized message type support so that paths can be
-# handed directly to IPC primitives such as streams and `Portal.run()`
-# calls:
-# - via ``msgspec``:
-#   - https://jcristharif.com/msgspec/api.html#struct
-#   - https://jcristharif.com/msgspec/extending.html
-# via ``msgpack-python``:
-# - https://github.com/msgpack/msgpack-python#packingunpacking-of-custom-data-type
+__all__ = ['pub']
 
-from __future__ import annotations
-from pkgutil import resolve_name
+log = get_logger('messaging')
 
 
-class NamespacePath(str):
-    '''
-    A serializeable description of a (function) Python object location
-    described by the target's module path and namespace key meant as
-    a message-native "packet" to allows actors to point-and-load objects
-    by absolute reference.
+async def fan_out_to_ctxs(
+    pub_async_gen_func: typing.Callable,  # it's an async gen ... gd mypy
+    topics2ctxs: Dict[str, list],
+    packetizer: typing.Callable = None,
+) -> None:
+    """Request and fan out quotes to each subscribed actor channel.
+    """
+    def get_topics():
+        return tuple(topics2ctxs.keys())
 
-    '''
-    _ref: object = None
+    agen = pub_async_gen_func(get_topics=get_topics)
 
-    def load_ref(self) -> object:
-        if self._ref is None:
-            self._ref = resolve_name(self)
-        return self._ref
+    async with aclosing(agen) as pub_gen:
 
-    def to_tuple(
-        self,
+        async for published in pub_gen:
 
-    ) -> tuple[str, str]:
-        ref = self.load_ref()
-        return ref.__module__, getattr(ref, '__name__', '')
+            ctx_payloads: List[Tuple[Context, Any]] = []
 
-    @classmethod
-    def from_ref(
-        cls,
-        ref,
+            for topic, data in published.items():
+                log.debug(f"publishing {topic, data}")
 
-    ) -> NamespacePath:
-        return cls(':'.join(
-            (ref.__module__,
-             getattr(ref, '__name__', ''))
-        ))
+                # build a new dict packet or invoke provided packetizer
+                if packetizer is None:
+                    packet = {topic: data}
+
+                else:
+                    packet = packetizer(topic, data)
+
+                for ctx in topics2ctxs.get(topic, list()):
+                    ctx_payloads.append((ctx, packet))
+
+            if not ctx_payloads:
+                log.debug(f"Unconsumed values:\n{published}")
+
+            # deliver to each subscriber (fan out)
+            if ctx_payloads:
+                for ctx, payload in ctx_payloads:
+                    try:
+                        await ctx.send_yield(payload)
+                    except (
+                        # That's right, anything you can think of...
+                        trio.ClosedResourceError, ConnectionResetError,
+                        ConnectionRefusedError,
+                    ):
+                        log.warning(f"{ctx.chan} went down?")
+                        for ctx_list in topics2ctxs.values():
+                            try:
+                                ctx_list.remove(ctx)
+                            except ValueError:
+                                continue
+
+            if not get_topics():
+                log.warning(f"No subscribers left for {pub_gen}")
+                break
+
+
+def modify_subs(
+
+    topics2ctxs: Dict[str, List[Context]],
+    topics: Set[str],
+    ctx: Context,
+
+) -> None:
+    """Absolute symbol subscription list for each quote stream.
+
+    Effectively a symbol subscription api.
+    """
+    log.info(f"{ctx.chan.uid} changed subscription to {topics}")
+
+    # update map from each symbol to requesting client's chan
+    for topic in topics:
+        topics2ctxs.setdefault(topic, list()).append(ctx)
+
+    # remove any existing symbol subscriptions if symbol is not
+    # found in ``symbols``
+    # TODO: this can likely be factored out into the pub-sub api
+    for topic in filter(
+        lambda topic: topic not in topics, topics2ctxs.copy()
+    ):
+        ctx_list = topics2ctxs.get(topic)
+        if ctx_list:
+            try:
+                ctx_list.remove(ctx)
+            except ValueError:
+                pass
+
+        if not ctx_list:
+            # pop empty sets which will trigger bg quoter task termination
+            topics2ctxs.pop(topic)
+
+
+_pub_state: Dict[str, dict] = {}
+_pubtask2lock: Dict[str, trio.StrictFIFOLock] = {}
+
+
+def pub(
+    wrapped: typing.Callable = None,
+    *,
+    tasks: Set[str] = set(),
+):
+    """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
+    each caller. The ``tasks: Set[str]`` argument to the decorator
+    specifies the names of the mutex set of publisher tasks.  When the
+    publisher function is called, an argument ``task_name`` must be
+    passed to specify which task (of the set named in ``tasks``) should
+    be used. This allows for using the same publisher with different
+    input (arguments) without allowing more concurrent tasks then
+    necessary.
+
+    Values yielded from the decorated async generator must be
+    ``Dict[str, Dict[str, Any]]`` where the fist level key is the topic
+    string and determines which subscription the packet will be
+    delivered to and the value is a packet ``Dict[str, Any]`` by default
+    of the form:
+
+    .. ::python
+
+        {topic: str: value: Any}
+
+    The caller can instead opt to pass a ``packetizer`` callback who's
+    return value will be delivered as the published response.
+
+    The decorated async generator function must accept an argument
+    :func:`get_topics` which dynamically returns the tuple of current
+    subscriber topics:
+
+    .. code:: python
+
+        from tractor.msg import pub
+
+        @pub(tasks={'source_1', 'source_2'})
+        async def pub_service(get_topics):
+            data = await web_request(endpoints=get_topics())
+            for item in data:
+                yield data['key'], data
+
+
+    The publisher must be called passing in the following arguments:
+    - ``topics: Set[str]`` the topic sequence or "subscriptions"
+    - ``task_name: str`` the task to use (if ``tasks`` was passed)
+    - ``ctx: Context`` the tractor context (only needed if calling the
+      pub func without a nursery, otherwise this is provided implicitly)
+    - packetizer: ``Callable[[str, Any], Any]`` a callback who receives
+      the topic and value from the publisher function each ``yield`` such that
+      whatever is returned is sent as the published value to subscribers of
+      that topic.  By default this is a dict ``{topic: str: value: Any}``.
+
+    As an example, to make a subscriber call the above function:
+
+    .. code:: python
+
+        from functools import partial
+        import tractor
+
+        async with tractor.open_nursery() as n:
+            portal = n.run_in_actor(
+                'publisher',  # actor name
+                partial(      # func to execute in it
+                    pub_service,
+                    topics=('clicks', 'users'),
+                    task_name='source1',
+                )
+            )
+            async for value in await portal.result():
+                print(f"Subscriber received {value}")
+
+
+    Here, you don't need to provide the ``ctx`` argument since the
+    remote actor provides it automatically to the spawned task. If you
+    were to call ``pub_service()`` directly from a wrapping function you
+    would need to provide this explicitly.
+
+    Remember you only need this if you need *a finite set of tasks*
+    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
+    if wrapped is None:
+        return partial(pub, tasks=tasks)
+
+    task2lock: Dict[str, trio.StrictFIFOLock] = {}
+
+    for name in tasks:
+        task2lock[name] = trio.StrictFIFOLock()
+
+    @wrapt.decorator
+    async def wrapper(agen, instance, args, kwargs):
+
+        # XXX: this is used to extract arguments properly as per the
+        # `wrapt` docs
+        async def _execute(
+            ctx: Context,
+            topics: Set[str],
+            *args,
+            # *,
+            task_name: str = None,  # default: only one task allocated
+            packetizer: Callable = None,
+            **kwargs,
+        ):
+            if task_name is None:
+                task_name = trio.lowlevel.current_task().name
+
+            if tasks and task_name not in tasks:
+                raise TypeError(
+                    f"{agen} must be called with a `task_name` named "
+                    f"argument with a value from {tasks}")
+
+            elif not tasks and not task2lock:
+                # add a default root-task lock if none defined
+                task2lock[task_name] = trio.StrictFIFOLock()
+
+            _pubtask2lock.update(task2lock)
+
+            topics = set(topics)
+            lock = _pubtask2lock[task_name]
+
+            all_subs = _pub_state.setdefault('_subs', {})
+            topics2ctxs = all_subs.setdefault(task_name, {})
+
+            try:
+                modify_subs(topics2ctxs, topics, ctx)
+                # block and let existing feed task deliver
+                # stream data until it is cancelled in which case
+                # the next waiting task will take over and spawn it again
+                async with lock:
+                    # no data feeder task yet; so start one
+                    respawn = True
+                    while respawn:
+                        respawn = False
+                        log.info(
+                            f"Spawning data feed task for {funcname}")
+                        try:
+                            # unblocks when no more symbols subscriptions exist
+                            # and the streamer task terminates
+                            await fan_out_to_ctxs(
+                                pub_async_gen_func=partial(
+                                    agen, *args, **kwargs),
+                                topics2ctxs=topics2ctxs,
+                                packetizer=packetizer,
+                            )
+                            log.info(
+                                f"Terminating stream task {task_name or ''}"
+                                f" for {agen.__name__}")
+                        except trio.BrokenResourceError:
+                            log.exception("Respawning failed data feed task")
+                            respawn = True
+            finally:
+                # remove all subs for this context
+                modify_subs(topics2ctxs, set(), ctx)
+
+                # if there are truly no more subscriptions with this broker
+                # drop from broker subs dict
+                if not any(topics2ctxs.values()):
+                    log.info(
+                        f"No more subscriptions for publisher {task_name}")
+
+        # invoke it
+        await _execute(*args, **kwargs)
+
+    funcname = wrapped.__name__
+    if not inspect.isasyncgenfunction(wrapped):
+        raise TypeError(
+            f"Publisher {funcname} must be an async generator function"
+        )
+    if 'get_topics' not in inspect.signature(wrapped).parameters:
+        raise TypeError(
+            f"Publisher async gen {funcname} must define a "
+            "`get_topics` argument"
+        )
+
+    # XXX: manually monkey the wrapped function since
+    # ``wrapt.decorator`` doesn't seem to want to play nice with its
+    # whole "adapter" thing...
+    wrapped._tractor_stream_function = True  # type: ignore
+
+    return wrapper(wrapped)

tractor/testing/__init__.py

@@ -14,16 +14,4 @@
 # 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/>.
 
-'''
-Experimental APIs and subsystems not yet validated to be included as
-built-ins.
-
-This is a staging area for ``tractor.builtin``.
-
-'''
-from ._pubsub import pub as msgpub
-
-
-__all__ = [
-    'msgpub',
-]
+from ._tractor_test import tractor_test

tractor/testing/_tractor_test.py

@@ -0,0 +1,104 @@
+# 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/>.
+
+import inspect
+import platform
+from functools import partial, wraps
+
+import trio
+import tractor
+
+
+__all__ = ['tractor_test']
+
+
+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 = 'spawn'
+            else:
+                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,
+
+                ) as actor:
+                    await fn(*args, **kwargs)
+
+            main = _main
+
+        else:
+            # use implicit root actor start
+            main = partial(fn, *args, **kwargs)
+
+        return trio.run(main)
+            # arbiter_addr=arb_addr,
+            # loglevel=loglevel,
+            # start_method=start_method,
+        # )
+
+    return wrapper

tractor/to_asyncio.py

@@ -32,15 +32,10 @@ from typing import (
 )
 
 import trio
-from outcome import Error
 
 from .log import get_logger
 from ._state import current_actor
 from ._exceptions import AsyncioCancelled
-from .trionics._broadcast import (
-    broadcast_receiver,
-    BroadcastReceiver,
-)
 
 log = get_logger(__name__)
 
@@ -62,35 +57,19 @@ class LinkedTaskChannel(trio.abc.Channel):
 
     _trio_cs: trio.CancelScope
     _aio_task_complete: trio.Event
-    _trio_exited: bool = False
 
     # set after ``asyncio.create_task()``
     _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()
 
     async def receive(self) -> Any:
-        async with translate_aio_errors(
-            self,
-
-            # XXX: obviously this will deadlock if an on-going stream is
-            # being procesed.
-            # wait_on_aio_task=False,
-        ):
-
-            # TODO: do we need this to guarantee asyncio code get's
-            # cancelled in the case where the trio side somehow creates
-            # a state where the asyncio cycle-task isn't getting the
-            # cancel request sent by (in theory) the last checkpoint
-            # cycle on the trio side?
-            # await trio.lowlevel.checkpoint()
-
+        async with translate_aio_errors(self):
             return await self._from_aio.receive()
 
-    async def wait_asyncio_complete(self) -> None:
+    async def wait_ayncio_complete(self) -> None:
         await self._aio_task_complete.wait()
 
     # def cancel_asyncio_task(self) -> None:
@@ -105,43 +84,6 @@ class LinkedTaskChannel(trio.abc.Channel):
         '''
         self._to_aio.put_nowait(item)
 
-    def closed(self) -> bool:
-        return self._from_aio._closed  # type: ignore
-
-    # TODO: shoud we consider some kind of "decorator" system
-    # that checks for structural-typing compatibliity and then
-    # automatically adds this ctx-mngr-as-method machinery?
-    @acm
-    async def subscribe(
-        self,
-
-    ) -> AsyncIterator[BroadcastReceiver]:
-        '''
-        Allocate and return a ``BroadcastReceiver`` which delegates
-        to this inter-task channel.
-
-        This allows multiple local tasks to receive each their own copy
-        of this message stream.
-
-        See ``tractor._streaming.MsgStream.subscribe()`` for further
-        similar details.
-        '''
-        if self._broadcaster is None:
-
-            bcast = self._broadcaster = broadcast_receiver(
-                self,
-                # use memory channel size by default
-                self._from_aio._state.max_buffer_size,  # type: ignore
-                receive_afunc=self.receive,
-            )
-
-            self.receive = bcast.receive  # type: ignore
-
-        async with self._broadcaster.subscribe() as bstream:
-            assert bstream.key != self._broadcaster.key
-            assert bstream._recv == self._broadcaster._recv
-            yield bstream
-
 
 def _run_asyncio_task(
 
@@ -157,7 +99,6 @@ def _run_asyncio_task(
     or stream the result back to ``trio``.
 
     '''
-    __tracebackhide__ = True
     if not current_actor().is_infected_aio():
         raise RuntimeError("`infect_asyncio` mode is not enabled!?")
 
@@ -217,7 +158,6 @@ def _run_asyncio_task(
         try:
             result = await coro
         except BaseException as aio_err:
-            log.exception('asyncio task errored')
             chan._aio_err = aio_err
             raise
 
@@ -241,7 +181,6 @@ def _run_asyncio_task(
                 to_trio.close()
 
             aio_task_complete.set()
-            log.runtime(f'`asyncio` task: {task.get_name()} is complete')
 
     # start the asyncio task we submitted from trio
     if not inspect.isawaitable(coro):
@@ -263,25 +202,20 @@ def _run_asyncio_task(
         '''
         nonlocal chan
         aio_err = chan._aio_err
-        task_err: Optional[BaseException] = None
 
         # only to avoid ``asyncio`` complaining about uncaptured
         # task exceptions
         try:
             task.exception()
         except BaseException as terr:
-            task_err = terr
-
-            if isinstance(terr, CancelledError):
-                log.cancel(f'`asyncio` task cancelled: {task.get_name()}')
-            else:
-                log.exception(f'`asyncio` task: {task.get_name()} errored')
-
             assert type(terr) is type(aio_err), 'Asyncio task error mismatch?'
 
         if aio_err is not None:
-            # XXX: uhh is this true?
-            # assert task_err, f'Asyncio task {task.get_name()} discrepancy!?'
+            if type(aio_err) is CancelledError:
+                log.cancel("infected task was cancelled")
+            else:
+                aio_err.with_traceback(aio_err.__traceback__)
+                log.exception("infected task errorred:")
 
             # NOTE: currently mem chan closure may act as a form
             # of error relay (at least in the ``asyncio.CancelledError``
@@ -290,28 +224,8 @@ def _run_asyncio_task(
             # We might want to change this in the future though.
             from_aio.close()
 
-            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.
-            cancel_scope.cancel()
-
-            # raise any ``asyncio`` side error.
-            raise aio_err
-
     task.add_done_callback(cancel_trio)
+
     return chan
 
 
@@ -319,7 +233,6 @@ def _run_asyncio_task(
 async def translate_aio_errors(
 
     chan: LinkedTaskChannel,
-    wait_on_aio_task: bool = False,
 
 ) -> AsyncIterator[None]:
     '''
@@ -327,11 +240,8 @@ async def translate_aio_errors(
     appropriately translates errors and cancels into ``trio`` land.
 
     '''
-    trio_task = trio.lowlevel.current_task()
-
     aio_err: Optional[BaseException] = None
 
-    # TODO: make thisi a channel method?
     def maybe_raise_aio_err(
         err: Optional[Exception] = None
     ) -> None:
@@ -350,22 +260,10 @@ async def translate_aio_errors(
     assert task
     try:
         yield
-
-    except (
-        trio.Cancelled,
-    ):
-        # relay cancel through to called ``asyncio`` task
-        assert chan._aio_task
-        chan._aio_task.cancel(
-            msg=f'the `trio` caller task was cancelled: {trio_task.name}'
-        )
-        raise
-
     except (
         # NOTE: see the note in the ``cancel_trio()`` asyncio task
         # termination callback
         trio.ClosedResourceError,
-        # trio.BrokenResourceError,
     ):
         aio_err = chan._aio_err
         if (
@@ -379,32 +277,14 @@ async def translate_aio_errors(
 
         else:
             raise
-
     finally:
-        if (
-            # NOTE: always cancel the ``asyncio`` task if we've made it
-            # this far and it's not done.
-            not task.done() and aio_err
-
-            # or the trio side has exited it's surrounding cancel scope
-            # indicating the lifetime of the ``asyncio``-side task
-            # should also be terminated.
-            or chan._trio_exited
-        ):
-            log.runtime(
-                f'Cancelling `asyncio`-task: {task.get_name()}'
-            )
+        # always cancel the ``asyncio`` task if we've made it this far
+        # and it's not done.
+        if not task.done() and aio_err:
             # assert not aio_err, 'WTF how did asyncio do this?!'
             task.cancel()
 
-        # Required to sync with the far end ``asyncio``-task to ensure
-        # any error is captured (via monkeypatching the
-        # ``channel._aio_err``) before calling ``maybe_raise_aio_err()``
-        # below!
-        if wait_on_aio_task:
-            await chan._aio_task_complete.wait()
-
-        # NOTE: if any ``asyncio`` error was caught, raise it here inline
+        # if any ``asyncio`` error was caught, raise it here inline
         # here in the ``trio`` task
         maybe_raise_aio_err()
 
@@ -429,10 +309,8 @@ async def run_task(
         **kwargs,
     )
     with chan._from_aio:
-        async with translate_aio_errors(
-            chan,
-            wait_on_aio_task=True,
-        ):
+        # try:
+        async with translate_aio_errors(chan):
             # return single value that is the output from the
             # ``asyncio`` function-as-task. Expect the mem chan api to
             # do the job of handling cross-framework cancellations
@@ -460,21 +338,13 @@ async def open_channel_from(
         **kwargs,
     )
     async with chan._from_aio:
-        async with translate_aio_errors(
-            chan,
-            wait_on_aio_task=True,
-        ):
+        async with translate_aio_errors(chan):
             # sync to a "started()"-like first delivered value from the
             # ``asyncio`` task.
-            try:
-                with chan._trio_cs:
-                    first = await chan.receive()
+            first = await chan.receive()
 
-                    # deliver stream handle upward
-                    yield first, chan
-            finally:
-                chan._trio_exited = True
-                chan._to_trio.close()
+            # stream values upward
+            yield first, chan
 
 
 def run_as_asyncio_guest(
@@ -491,18 +361,16 @@ def run_as_asyncio_guest(
     SC semantics.
 
     '''
-    # Uh, oh.
-    #
-    # :o
+    # Uh, oh. :o
 
     # It looks like your event loop has caught a case of the ``trio``s.
 
     # :()
 
-    # Don't worry, we've heard you'll barely notice. You might
-    # hallucinate a few more propagating errors and feel like your
-    # digestion has slowed but if anything get's too bad your parents
-    # will know about it.
+    # Don't worry, we've heard you'll barely notice. You might hallucinate
+    # a few more propagating errors and feel like your digestion has
+    # slowed but if anything get's too bad your parents will know about
+    # it.
 
     # :)
 
@@ -513,20 +381,8 @@ def run_as_asyncio_guest(
 
         def trio_done_callback(main_outcome):
 
-            if isinstance(main_outcome, Error):
-                error = main_outcome.error
-                trio_done_fut.set_exception(error)
-
-                # TODO: explicit asyncio tb?
-                # traceback.print_exception(error)
-
-                # XXX: do we need this?
-                # actor.cancel_soon()
-
-                main_outcome.unwrap()
-            else:
-                trio_done_fut.set_result(main_outcome)
-                log.runtime(f"trio_main finished: {main_outcome!r}")
+            print(f"trio_main finished: {main_outcome!r}")
+            trio_done_fut.set_result(main_outcome)
 
         # start the infection: run trio on the asyncio loop in "guest mode"
         log.info(f"Infecting asyncio process with {trio_main}")
@@ -536,7 +392,6 @@ def run_as_asyncio_guest(
             run_sync_soon_threadsafe=loop.call_soon_threadsafe,
             done_callback=trio_done_callback,
         )
-        # ``.unwrap()`` will raise here on error
         return (await trio_done_fut).unwrap()
 
     # might as well if it's installed.

tractor/trionics/__init__.py

@@ -21,7 +21,6 @@ Sugary patterns for trio + tractor designs.
 from ._mngrs import (
     gather_contexts,
     maybe_open_context,
-    maybe_open_nursery,
 )
 from ._broadcast import (
     broadcast_receiver,
@@ -36,5 +35,4 @@ __all__ = [
     'BroadcastReceiver',
     'Lagged',
     'maybe_open_context',
-    'maybe_open_nursery',
 ]

tractor/trionics/_broadcast.py

@@ -23,6 +23,7 @@ from __future__ import annotations
 from abc import abstractmethod
 from collections import deque
 from contextlib import asynccontextmanager
+from dataclasses import dataclass
 from functools import partial
 from operator import ne
 from typing import Optional, Callable, Awaitable, Any, AsyncIterator, Protocol
@@ -32,10 +33,7 @@ import trio
 from trio._core._run import Task
 from trio.abc import ReceiveChannel
 from trio.lowlevel import current_task
-from msgspec import Struct
-from tractor.log import get_logger
 
-log = get_logger(__name__)
 
 # A regular invariant generic type
 T = TypeVar("T")
@@ -88,7 +86,8 @@ class Lagged(trio.TooSlowError):
     '''
 
 
-class BroadcastState(Struct):
+@dataclass
+class BroadcastState:
     '''
     Common state to all receivers of a broadcast.
 
@@ -111,35 +110,7 @@ class BroadcastState(Struct):
     eoc: bool = False
 
     # If the broadcaster was cancelled, we might as well track it
-    cancelled: dict[int, Task] = {}
-
-    def statistics(self) -> dict[str, Any]:
-        '''
-        Return broadcast receiver group "statistics" like many of
-        ``trio``'s internal task-sync primitives.
-
-        '''
-        key: int | None
-        ev: trio.Event | None
-
-        subs = self.subs
-        if self.recv_ready is not None:
-            key, ev = self.recv_ready
-        else:
-            key = ev = None
-
-        qlens: dict[int, int] = {}
-        for tid, sz in subs.items():
-            qlens[tid] = sz if sz != -1 else 0
-
-        return {
-            'open_consumers': len(subs),
-            'queued_len_by_task': qlens,
-            'max_buffer_size': self.maxlen,
-            'tasks_waiting': ev.statistics().tasks_waiting if ev else 0,
-            'tasks_cancelled': self.cancelled,
-            'next_value_receiver_id': key,
-        }
+    cancelled: bool = False
 
 
 class BroadcastReceiver(ReceiveChannel):
@@ -157,40 +128,23 @@ class BroadcastReceiver(ReceiveChannel):
         rx_chan: AsyncReceiver,
         state: BroadcastState,
         receive_afunc: Optional[Callable[[], Awaitable[Any]]] = None,
-        raise_on_lag: bool = True,
 
     ) -> None:
 
         # register the original underlying (clone)
         self.key = id(self)
         self._state = state
-
-        # each consumer has an int count which indicates
-        # which index contains the next value that the task has not yet
-        # consumed and thus should read. In the "up-to-date" case the
-        # consumer task must wait for a new value from the underlying
-        # receiver and we use ``-1`` as the sentinel for this state.
         state.subs[self.key] = -1
 
         # underlying for this receiver
         self._rx = rx_chan
         self._recv = receive_afunc or rx_chan.receive
         self._closed: bool = False
-        self._raise_on_lag = raise_on_lag
 
-    def receive_nowait(
-        self,
-        _key: int | None = None,
-        _state: BroadcastState | None = None,
+    async def receive(self) -> ReceiveType:
 
-    ) -> Any:
-        '''
-        Sync version of `.receive()` which does all the low level work
-        of receiving from the underlying/wrapped receive channel.
-
-        '''
-        key = _key or self.key
-        state = _state or self._state
+        key = self.key
+        state = self._state
 
         # TODO: ideally we can make some way to "lock out" the
         # underlying receive channel in some way such that if some task
@@ -223,173 +177,128 @@ class BroadcastReceiver(ReceiveChannel):
                 # return this value."
                 # https://docs.rs/tokio/1.11.0/tokio/sync/broadcast/index.html#lagging
 
-                mxln = state.maxlen
-                lost = seq - mxln
-
                 # decrement to the last value and expect
                 # consumer to either handle the ``Lagged`` and come back
                 # or bail out on its own (thus un-subscribing)
-                state.subs[key] = mxln - 1
+                state.subs[key] = state.maxlen - 1
 
                 # this task was overrun by the producer side
                 task: Task = current_task()
-                msg = f'Task `{task.name}` overrun and dropped `{lost}` values'
-
-                if self._raise_on_lag:
-                    raise Lagged(msg)
-                else:
-                    log.warning(msg)
-                    return self.receive_nowait(_key, _state)
+                raise Lagged(f'Task {task.name} was overrun')
 
             state.subs[key] -= 1
             return value
 
-        raise trio.WouldBlock
+        # current task already has the latest value **and** is the
+        # first task to begin waiting for a new one
+        if state.recv_ready is None:
 
-    async def _receive_from_underlying(
-        self,
-        key: int,
-        state: BroadcastState,
+            if self._closed:
+                raise trio.ClosedResourceError
 
-    ) -> ReceiveType:
+            event = trio.Event()
+            state.recv_ready = key, event
 
-        if self._closed:
-            raise trio.ClosedResourceError
-
-        event = trio.Event()
-        assert state.recv_ready is None
-        state.recv_ready = key, event
-
-        try:
             # if we're cancelled here it should be
             # fine to bail without affecting any other consumers
             # right?
-            value = await self._recv()
+            try:
+                value = await self._recv()
 
-            # items with lower indices are "newer"
-            # NOTE: ``collections.deque`` implicitly takes care of
-            # trucating values outside our ``state.maxlen``. In the
-            # alt-backend-array-case we'll need to make sure this is
-            # implemented in similar ringer-buffer-ish style.
-            state.queue.appendleft(value)
+                # items with lower indices are "newer"
+                # NOTE: ``collections.deque`` implicitly takes care of
+                # trucating values outside our ``state.maxlen``. In the
+                # alt-backend-array-case we'll need to make sure this is
+                # implemented in similar ringer-buffer-ish style.
+                state.queue.appendleft(value)
 
-            # broadcast new value to all subscribers by increasing
-            # all sequence numbers that will point in the queue to
-            # their latest available value.
+                # broadcast new value to all subscribers by increasing
+                # all sequence numbers that will point in the queue to
+                # their latest available value.
 
-            # don't decrement the sequence for this task since we
-            # already retreived the last value
+                # don't decrement the sequence for this task since we
+                # already retreived the last value
 
-            # XXX: which of these impls is fastest?
-            # subs = state.subs.copy()
-            # subs.pop(key)
+                # XXX: which of these impls is fastest?
 
-            for sub_key in filter(
-                # lambda k: k != key, state.subs,
-                partial(ne, key), state.subs,
+                # subs = state.subs.copy()
+                # subs.pop(key)
+
+                for sub_key in filter(
+                    # lambda k: k != key, state.subs,
+                    partial(ne, key), state.subs,
+                ):
+                    state.subs[sub_key] += 1
+
+                # NOTE: this should ONLY be set if the above task was *NOT*
+                # cancelled on the `._recv()` call.
+                event.set()
+                return value
+
+            except trio.EndOfChannel:
+                # if any one consumer gets an EOC from the underlying
+                # receiver we need to unblock and send that signal to
+                # all other consumers.
+                self._state.eoc = True
+                if event.statistics().tasks_waiting:
+                    event.set()
+                raise
+
+            except (
+                trio.Cancelled,
             ):
-                state.subs[sub_key] += 1
+                # handle cancelled specially otherwise sibling
+                # consumers will be awoken with a sequence of -1
+                # and will potentially try to rewait the underlying
+                # receiver instead of just cancelling immediately.
+                self._state.cancelled = True
+                if event.statistics().tasks_waiting:
+                    event.set()
+                raise
 
-            # NOTE: this should ONLY be set if the above task was *NOT*
-            # cancelled on the `._recv()` call.
-            event.set()
-            return value
+            finally:
 
-        except trio.EndOfChannel:
-            # if any one consumer gets an EOC from the underlying
-            # receiver we need to unblock and send that signal to
-            # all other consumers.
-            self._state.eoc = True
-            if event.statistics().tasks_waiting:
-                event.set()
-            raise
-
-        except (
-            trio.Cancelled,
-        ):
-            # handle cancelled specially otherwise sibling
-            # consumers will be awoken with a sequence of -1
-            # and will potentially try to rewait the underlying
-            # receiver instead of just cancelling immediately.
-            self._state.cancelled[key] = current_task()
-            if event.statistics().tasks_waiting:
-                event.set()
-            raise
-
-        finally:
-            # Reset receiver waiter task event for next blocking condition.
-            # this MUST be reset even if the above ``.recv()`` call
-            # was cancelled to avoid the next consumer from blocking on
-            # an event that won't be set!
-            state.recv_ready = None
-
-    async def receive(self) -> ReceiveType:
-        key = self.key
-        state = self._state
-
-        try:
-            return self.receive_nowait(
-                _key=key,
-                _state=state,
-            )
-        except trio.WouldBlock:
-            pass
-
-        # current task already has the latest value **and** is the
-        # first task to begin waiting for a new one so we begin blocking
-        # until rescheduled with the a new value from the underlying.
-        if state.recv_ready is None:
-            return await self._receive_from_underlying(key, state)
+                # Reset receiver waiter task event for next blocking condition.
+                # this MUST be reset even if the above ``.recv()`` call
+                # was cancelled to avoid the next consumer from blocking on
+                # an event that won't be set!
+                state.recv_ready = None
 
         # This task is all caught up and ready to receive the latest
-        # value, so queue/schedule it to be woken on the next internal
-        # event.
+        # value, so queue sched it on the internal event.
         else:
-            while state.recv_ready is not None:
-                # seq = state.subs[key]
-                # assert seq == -1  # sanity
-                _, ev = state.recv_ready
-                await ev.wait()
-                try:
-                    return self.receive_nowait(
-                        _key=key,
-                        _state=state,
-                    )
-                except trio.WouldBlock:
-                    if self._closed:
-                        raise trio.ClosedResourceError
+            seq = state.subs[key]
+            assert seq == -1  # sanity
+            _, ev = state.recv_ready
+            await ev.wait()
 
-                    subs = state.subs
-                    if (
-                        len(subs) == 1
-                        and key in subs
-                        # or cancelled
-                    ):
-                        # XXX: we are the last and only user of this BR so
-                        # likely it makes sense to unwind back to the
-                        # underlying?
-                        # import tractor
-                        # await tractor.breakpoint()
-                        log.warning(
-                            f'Only one sub left for {self}?\n'
-                            'We can probably unwind from breceiver?'
-                        )
+            # NOTE: if we ever would like the behaviour where if the
+            # first task to recv on the underlying is cancelled but it
+            # still DOES trigger the ``.recv_ready``, event we'll likely need
+            # this logic:
 
-                    # XXX: In the case where the first task to allocate the
-                    # ``.recv_ready`` event is cancelled we will be woken
-                    # with a non-incremented sequence number (the ``-1``
-                    # sentinel) and thus will read the oldest value if we
-                    # use that. Instead we need to detect if we have not
-                    # been incremented and then receive again.
-                    # return await self.receive()
+            if seq > -1:
+                # stuff from above..
+                seq = state.subs[key]
 
-            return await self._receive_from_underlying(key, state)
+                value = state.queue[seq]
+                state.subs[key] -= 1
+                return value
+
+            elif seq == -1:
+                # XXX: In the case where the first task to allocate the
+                # ``.recv_ready`` event is cancelled we will be woken with
+                # a non-incremented sequence number and thus will read the
+                # oldest value if we use that. Instead we need to detect if
+                # we have not been incremented and then receive again.
+                return await self.receive()
+
+            else:
+                raise ValueError(f'Invalid sequence {seq}!?')
 
     @asynccontextmanager
     async def subscribe(
         self,
-        raise_on_lag: bool = True,
-
     ) -> AsyncIterator[BroadcastReceiver]:
         '''
         Subscribe for values from this broadcast receiver.
@@ -407,7 +316,6 @@ class BroadcastReceiver(ReceiveChannel):
             rx_chan=self._rx,
             state=state,
             receive_afunc=self._recv,
-            raise_on_lag=raise_on_lag,
         )
         # assert clone in state.subs
         assert br.key in state.subs
@@ -444,8 +352,7 @@ def broadcast_receiver(
 
     recv_chan: AsyncReceiver,
     max_buffer_size: int,
-    receive_afunc: Optional[Callable[[], Awaitable[Any]]] = None,
-    raise_on_lag: bool = True,
+    **kwargs,
 
 ) -> BroadcastReceiver:
 
@@ -456,6 +363,5 @@ def broadcast_receiver(
             maxlen=max_buffer_size,
             subs={},
         ),
-        receive_afunc=receive_afunc,
-        raise_on_lag=raise_on_lag,
+        **kwargs,
     )

tractor/trionics/_mngrs.py

@@ -19,7 +19,6 @@ Async context manager primitives with hard ``trio``-aware semantics
 
 '''
 from contextlib import asynccontextmanager as acm
-import inspect
 from typing import (
     Any,
     AsyncContextManager,
@@ -35,8 +34,8 @@ from typing import (
 import trio
 from trio_typing import TaskStatus
 
-from .._state import current_actor
 from ..log import get_logger
+from .._state import current_actor
 
 
 log = get_logger(__name__)
@@ -45,25 +44,6 @@ log = get_logger(__name__)
 T = TypeVar("T")
 
 
-@acm
-async def maybe_open_nursery(
-    nursery: trio.Nursery | None = None,
-    shield: bool = False,
-) -> AsyncGenerator[trio.Nursery, Any]:
-    '''
-    Create a new nursery if None provided.
-
-    Blocks on exit as expected if no input nursery is provided.
-
-    '''
-    if nursery is not None:
-        yield nursery
-    else:
-        async with trio.open_nursery() as nursery:
-            nursery.cancel_scope.shield = shield
-            yield nursery
-
-
 async def _enter_and_wait(
 
     mngr: AsyncContextManager[T],
@@ -91,7 +71,7 @@ async def gather_contexts(
 
     mngrs: Sequence[AsyncContextManager[T]],
 
-) -> AsyncGenerator[tuple[Optional[T], ...], None]:
+) -> AsyncGenerator[tuple[T, ...], None]:
     '''
     Concurrently enter a sequence of async context managers, each in
     a separate ``trio`` task and deliver the unwrapped values in the
@@ -101,25 +81,14 @@ async def gather_contexts(
     This function is somewhat similar to common usage of
     ``contextlib.AsyncExitStack.enter_async_context()`` (in a loop) in
     combo with ``asyncio.gather()`` except the managers are concurrently
-    entered and exited, and cancellation just works.
+    entered and exited cancellation just works.
 
     '''
-    unwrapped: dict[int, Optional[T]] = {}.fromkeys(id(mngr) for mngr in mngrs)
+    unwrapped = {}.fromkeys(id(mngr) for mngr in mngrs)
 
     all_entered = trio.Event()
     parent_exit = trio.Event()
 
-    # XXX: ensure greedy sequence of manager instances
-    # since a lazy inline generator doesn't seem to work
-    # with `async with` syntax.
-    mngrs = list(mngrs)
-
-    if not mngrs:
-        raise ValueError(
-            'input mngrs is empty?\n'
-            'Did try to use inline generator syntax?'
-        )
-
     async with trio.open_nursery() as n:
         for mngr in mngrs:
             n.start_soon(
@@ -133,13 +102,11 @@ async def gather_contexts(
         # deliver control once all managers have started up
         await all_entered.wait()
 
-        try:
-            yield tuple(unwrapped.values())
-        finally:
-            # NOTE: this is ABSOLUTELY REQUIRED to avoid
-            # the following wacky bug:
-            # <tractorbugurlhere>
-            parent_exit.set()
+        yield tuple(unwrapped.values())
+
+        # we don't need a try/finally since cancellation will be triggered
+        # by the surrounding nursery on error.
+        parent_exit.set()
 
 
 # Per actor task caching helpers.
@@ -152,15 +119,13 @@ class _Cache:
     a kept-alive-while-in-use async resource.
 
     '''
-    service_n: Optional[trio.Nursery] = None
-    locks: dict[Hashable, trio.Lock] = {}
+    lock = trio.Lock()
     users: int = 0
     values: dict[Any,  Any] = {}
     resources: dict[
         Hashable,
         tuple[trio.Nursery, trio.Event]
     ] = {}
-    # nurseries: dict[int, trio.Nursery] = {}
     no_more_users: Optional[trio.Event] = None
 
     @classmethod
@@ -191,7 +156,7 @@ async def maybe_open_context(
     # XXX: used as cache key after conversion to tuple
     # and all embedded values must also be hashable
     kwargs: dict = {},
-    key: Hashable | Callable[..., Hashable] = None,
+    key: Hashable = None,
 
 ) -> AsyncIterator[tuple[bool, T]]:
     '''
@@ -200,69 +165,51 @@ async def maybe_open_context(
     _Cached instance on a _Cache hit.
 
     '''
-    fid = id(acm_func)
+    # lock resource acquisition around task racing  / ``trio``'s
+    # scheduler protocol
+    await _Cache.lock.acquire()
 
-    if inspect.isfunction(key):
-        ctx_key = (fid, key(**kwargs))
-    else:
-        ctx_key = (fid, key or tuple(kwargs.items()))
-
-    # yielded output
-    yielded: Any = None
-
-    # Lock resource acquisition around task racing  / ``trio``'s
-    # scheduler protocol.
-    # NOTE: the lock is target context manager func specific in order
-    # 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())
-    await lock.acquire()
-
-    # XXX: one singleton nursery per actor and we want to
-    # have it not be closed until all consumers have exited (which is
-    # currently difficult to implement any other way besides using our
-    # pre-allocated runtime instance..)
-    service_n: trio.Nursery = current_actor()._service_n
-
-    # TODO: is there any way to allocate
-    # a 'stays-open-till-last-task-finshed nursery?
-    # service_n: trio.Nursery
-    # async with maybe_open_nursery(_Cache.service_n) as service_n:
-    #     _Cache.service_n = service_n
+    ctx_key = (id(acm_func), key or tuple(kwargs.items()))
+    value = None
 
     try:
         # **critical section** that should prevent other tasks from
         # checking the _Cache until complete otherwise the scheduler
         # may switch and by accident we create more then one resource.
-        yielded = _Cache.values[ctx_key]
+        value = _Cache.values[ctx_key]
 
     except KeyError:
         log.info(f'Allocating new {acm_func} for {ctx_key}')
+
         mngr = acm_func(**kwargs)
+        # TODO: avoid pulling from ``tractor`` internals and
+        # instead offer a "root nursery" in piker actors?
+        service_n = current_actor()._service_n
+
+        # TODO: does this need to be a tractor "root nursery"?
         resources = _Cache.resources
         assert not resources.get(ctx_key), f'Resource exists? {ctx_key}'
-        resources[ctx_key] = (service_n, trio.Event())
+        ln, _ = resources[ctx_key] = (service_n, trio.Event())
 
-        # sync up to the mngr's yielded value
-        yielded = await service_n.start(
+        value = await ln.start(
             _Cache.run_ctx,
             mngr,
             ctx_key,
         )
         _Cache.users += 1
-        lock.release()
-        yield False, yielded
+        _Cache.lock.release()
+        yield False, value
 
     else:
         log.info(f'Reusing _Cached resource for {ctx_key}')
         _Cache.users += 1
-        lock.release()
-        yield True, yielded
+        _Cache.lock.release()
+        yield True, value
 
     finally:
         _Cache.users -= 1
 
-        if yielded is not None:
+        if value is not None:
             # if no more consumers, teardown the client
             if _Cache.users <= 0:
                 log.info(f'De-allocating resource for {ctx_key}')
@@ -274,5 +221,3 @@ async def maybe_open_context(
                 if entry:
                     _, no_more_users = entry
                     no_more_users.set()
-
-                _Cache.locks.pop(fid)