Add `maybe_signal_aio_task()` + cause-chain guard
Factor the "deliver an exc to a running aio task" pattern out of
`translate_aio_errors()` + `open_channel_from()` into a shared
`maybe_signal_aio_task()` helper. Add a cause-chain matrix comment
+ relay-echo guard so the final-raise block can't cycle
`trio_err.__cause__` back onto its own derivative relay.
`maybe_signal_aio_task()`,
- Delivers `exc` via `aio_task._fut_waiter.set_exception()` — NOT
`aio_task.set_exception()` which on py3.13+ ALWAYS raises
`RuntimeError("Task does not support set_exception")` (dead code as
a relay mechanism).
- Returns `(delivered: bool, report: str)`. Caller uses `delivered` to
flip `wait_on_aio_task` when delivery failed (avoids hanging on
`_aio_task_complete.wait()`).
- `pre_captured_fut=`: required when the caller crosses a trio
checkpoint between capturing `_fut_waiter` and invoking the helper.
`Task._wakeup` clears `_fut_waiter = None` so re-reading
post-checkpoint loses the ref even though the exc is still in-flight
on the (now-`done()`) original fut.
- `cause=`: sets `exc.__cause__ = cause` so the relay carries
a "trio_err -> caused -> relay" chain through `set_exception()`
→ `Task._wakeup` → coro raise → `wait_on_coro_final_result`
→ `signal_trio_when_done` → `task.result()`-raise.
- `allow_cancel_fallback=True`: opt-in `aio_task.cancel()` for the
narrow case where `_fut_waiter is None` AND task is runnable (sitting
in asyncio's ready queue, not parked on a poke-able future). NEVER
cancels when `_fut_waiter` carries an in-flight exc — that would race
+ mask the real terminating exc.
`translate_aio_errors()`,
- Replace the two ad-hoc `_fut_waiter.set_exception()`
/ `aio_task.set_exception()` call sites w/ the helper.
- Capture `pre_cp_fut = aio_task._fut_waiter` BEFORE the post-shutdown
`trio.lowlevel.checkpoint()` (critical: `_wakeup` clears the ref).
- New "cross-loop cause-chain matrix" comment block on the final-raise
— tabulates every `(trio_err, aio_err, trio_to_raise)` combo into
exactly one terminal `raise X [from Y]` or early `return`. Covers the
sibling `signal_trio_when_done()` resolution + the relay-echo
INVARIANT.
- New relay-echo guard: if `aio_err` is one of OUR OWN signals
(`TrioTaskExited`/`TrioCancelled`) AND `aio_err.__cause__ is
trio_err`, raise the bare `trio_err` instead of `trio_err from
aio_err` (which would CYCLE the cause chain since the relay was itself
caused-by `trio_err`).
- Drop the stale "the `task.set_exception(aio_taskc)` call MUST NOT
EXCEPT or this WILL HANG" warning — the helper handles the failure
path explicitly via `delivered=False` → `wait_on_aio_task = False`.
- Carry `cause=trio_err` on both the cancel-relay (`TrioCancelled`) and
the graceful-exit relay (`TrioTaskExited`) so the aio-side traceback
shows the real root.
`open_channel_from()`,
- Adopt the same helper; drop the dead "SHOULD NEVER GET HERE !?!?"
+ `tractor.pause(shield=True)` panic branch.
- Capture in-flight trio-side exc via `sys.exc_info()[1]` and pass as
`cause=` — non-`None` only when the `try` body raised (graceful exit
→ None).
Other,
- Top-level import: `sys` (for `sys.exc_info()`).
- `run_as_asyncio_guest()`: add commented-out alt `out: Outcome = await
trio_done_fute` next to the shielded version — exploratory note for
the longstanding "why is `.shield()` needed?" TODO.
(this patch was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code
trionics.start_or_cancel
parent
3d9c75b6ed
commit
acd1cbeec4
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@ -27,6 +27,7 @@ from contextlib import asynccontextmanager as acm
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from dataclasses import dataclass
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import inspect
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import platform
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import sys
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import traceback
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from typing import (
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Any,
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@ -810,6 +811,151 @@ def _run_asyncio_task(
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return chan
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def maybe_signal_aio_task(
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aio_task: asyncio.Task,
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exc: BaseException,
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*,
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cause: BaseException|None = None,
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pre_captured_fut: asyncio.Future|None = None,
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allow_cancel_fallback: bool = False,
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) -> tuple[bool, str]:
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'''
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Best-effort delivery of `exc` to a still-running `aio_task`
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via its `_fut_waiter` (the `asyncio.Future` the task is
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currently `await`-ing on).
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Returns `(delivered, report)` where `delivered=True` iff
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either,
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- `fut.set_exception(exc)` was successfully called on an
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un-`done()` `_fut_waiter`, OR
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- the cancel-fallback path fired (only when the caller
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opted-in via `allow_cancel_fallback=True`).
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Why `_fut_waiter.set_exception(exc)` and NOT
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`aio_task.set_exception(exc)`:
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On py3.13+ `asyncio.Task.set_exception()` ALWAYS raises
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`RuntimeError("Task does not support set_exception
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operation")` — so calling it as a relay mechanism is dead
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code. The `_fut_waiter` is a plain `asyncio.Future` and
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its `set_exception()` works on all Python versions; the
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task's `_wakeup` callback then propagates the exc into
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the coro on its next tick.
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Why we PREFER NOT to call `aio_task.cancel()`:
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`Task.cancel()` injects a `CancelledError` that races
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any in-flight exception already queued on `_fut_waiter`
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(e.g. via a prior `set_exception()` from a sibling
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teardown path). The race can mask BOTH the original
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trio-side error and any asyncio-side error the task was
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mid-raising. See the
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`test_trio_closes_early_and_channel_exits` hang TODO
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around the `translate_aio_errors` finally for the
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historical artifact.
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However a caller may have NO OTHER way to terminate the
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task — when `_fut_waiter is None` AND the task is busy
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looping / runnable, neither `set_exception` nor a chan
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close can poke it. In that narrow case `cancel()` is the
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only available termination signal; opt-in via
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`allow_cancel_fallback=True`. The fallback NEVER runs
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when `_fut_waiter` carries an in-flight exc (the
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`fut.done()` branch); only when there's truly no
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`_fut_waiter` ref to poke.
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Pre-checkpoint capture:
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`asyncio.Task._wakeup` clears `_fut_waiter = None` as
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part of the wakeup sequence. If the caller crosses a
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trio checkpoint between fut-capture and this call,
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re-reading `aio_task._fut_waiter` will see `None` even
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though the exc is still in flight on the (now-`done()`)
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original fut. Pass `pre_captured_fut` to use the
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already-captured reference.
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Causal chaining via `cause`:
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Pass the underlying trio-side exc (the *reason* we're
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poking the aio side) via `cause` and the helper sets
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`exc.__cause__ = cause`. The chain travels with `exc`
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through `_fut_waiter.set_exception()` → `Task._wakeup`
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→ coro raise → `wait_on_coro_final_result`'s except →
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`signal_trio_when_done`'s `task.result()`-`raise
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aio_err`. The final traceback then renders as
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"<trio-side exc> -> (direct cause of) -> <relay exc>"
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instead of an opaque, root-cause-detached relay.
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See the "cross-loop cause-chain matrix" comment in
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`translate_aio_errors()`'s final-raise block for how this
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`cause` interacts with every `raise X [from Y]` exit path
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(esp. the relay-echo guard which prevents a cause CYCLE).
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'''
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if cause is not None and exc.__cause__ is None:
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exc.__cause__ = cause
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if aio_task.done():
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return False, (
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f'aio-task already done; nothing to signal\n'
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f' |_{aio_task!r}\n'
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)
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fut: asyncio.Future|None = (
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pre_captured_fut
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if pre_captured_fut is not None
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else aio_task._fut_waiter
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)
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if fut and not fut.done():
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fut.set_exception(exc)
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return True, (
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f'signalled aio-task via `_fut_waiter.set_exception()`\n'
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f'exc: {exc!r}\n'
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f' |_{aio_task!r}\n'
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)
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if fut and fut.done():
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# NEVER cancel here even when `allow_cancel_fallback=True`
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# — the in-flight exc on `fut` will terminate the task
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# on its next tick; injecting `CancelledError` on top
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# would race and mask the real exc.
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return False, (
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f'`_fut_waiter` already signalled with,\n'
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f' |_{fut.exception()!r}\n'
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f'aio-task will exit on next tick via the in-flight exc;\n'
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f'SKIPPING re-signal (would race in-flight delivery).\n'
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f' |_{aio_task!r}\n'
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)
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# fut is None — task is runnable (sitting in asyncio's
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# ready queue), not parked on a future we can poke.
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if allow_cancel_fallback:
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cancel_msg: str = (
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f'\n'
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f'MANUALLY Cancelling `asyncio`-task: '
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f'{aio_task.get_name()}!\n\n'
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f'**THIS CAN SILENTLY SUPPRESS ERRORS FYI\n\n'
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)
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aio_task.cancel(msg=cancel_msg)
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return True, (
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f'aio-task has no `_fut_waiter`; FALLBACK cancel issued\n'
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f'(caller opted-in via `allow_cancel_fallback=True`).\n'
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f'{cancel_msg}'
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f' |_{aio_task!r}\n'
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)
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return False, (
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f'aio-task has no `_fut_waiter`; cannot signal without\n'
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f'`aio_task.cancel()` which can mask errors.\n'
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f'LEAVING AS-IS (caller did NOT opt-in to cancel fallback);\n'
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f'task should exit via chan close / aio-loop teardown\n'
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f'already in flight.\n'
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f' |_{aio_task!r}\n'
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)
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@acm
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async def translate_aio_errors(
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chan: LinkedTaskChannel,
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@ -985,38 +1131,25 @@ async def translate_aio_errors(
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# if isinstance(chan._aio_err, AsyncioTaskExited):
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# await tractor.pause(shield=True)
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# if aio side is still active cancel it due to the trio-side
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# error!
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# if aio side is still active relay the trio-side error
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# to it via `_fut_waiter.set_exception()`.
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# ?TODO, mk `AsyncioCancelled[typeof(trio_err)]` embed the
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# current exc?
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if (
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# not aio_task.cancelled()
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# and
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not aio_task.done() # TODO? only need this one?
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# XXX LOL, so if it's not set it's an error !?
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# yet another good jerb by `ascyncio`..
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# and
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# not aio_task.exception()
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):
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aio_taskc = TrioCancelled(
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f'The `trio`-side task crashed!\n'
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f'{trio_err}'
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)
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# ??TODO? move this into the func that tries to use
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# `Task._fut_waiter: Future` instead??
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#
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# aio_task.set_exception(aio_taskc)
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# wait_on_aio_task = False
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try:
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aio_task.set_exception(aio_taskc)
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except (
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asyncio.InvalidStateError,
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RuntimeError,
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# ^XXX, uhh bc apparently we can't use `.set_exception()`
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# any more XD .. ??
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):
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delivered, report = maybe_signal_aio_task(
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aio_task,
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aio_taskc,
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# so the relay carries a "<trio_err> -> caused ->
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# TrioCancelled" chain when it eventually re-raises
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# on the aio side.
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cause=trio_err,
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)
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if not delivered:
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wait_on_aio_task = False
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log.cancel(report)
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finally:
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# record wtv `trio`-side error transpired
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@ -1099,27 +1232,22 @@ async def translate_aio_errors(
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if _py_313:
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chan._to_aio.shutdown()
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# XXX CRITICAL ordering: capture `_fut_waiter`
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# BEFORE the checkpoint. `asyncio.Task._wakeup`
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# clears `_fut_waiter = None` as part of wakeup,
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# so re-reading after the checkpoint loses the
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# ref even though the exc is still in-flight on
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# the (now-`done()`) original fut. The helper
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# uses `pre_captured_fut` to recover that.
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pre_cp_fut: asyncio.Future|None = aio_task._fut_waiter
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# pump this event-loop (well `Runner` but ya)
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#
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# TODO? is this actually needed?
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# -[ ] theory is this let's the aio side error on
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# next tick and then we sync task states from
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# here onward?
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# so the aio side can error on next tick and we
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# sync task states from here onward.
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await trio.lowlevel.checkpoint()
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# TODO? factor the next 2 branches into a func like
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# `try_terminate_aio_task()` and use it for the taskc
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# case above as well?
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fut: asyncio.Future|None = aio_task._fut_waiter
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if (
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fut
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and
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not fut.done()
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):
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# await tractor.pause()
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if graceful_trio_exit:
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fut.set_exception(
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TrioTaskExited(
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relay_exc = TrioTaskExited(
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f'the `trio.Task` gracefully exited but '
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f'its `asyncio` peer is not done?\n'
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f')>\n'
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@ -1128,31 +1256,30 @@ async def translate_aio_errors(
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f'>>\n'
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f' |_{aio_task!r}\n'
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)
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)
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# TODO? should this need to exist given the equiv
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# `TrioCancelled` equivalent in the be handler
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# above??
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else:
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fut.set_exception(
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TrioTaskExited(
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relay_exc = TrioTaskExited(
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f'The `trio`-side task crashed!\n'
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f'{trio_err}'
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)
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delivered, signal_report = maybe_signal_aio_task(
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aio_task,
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relay_exc,
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pre_captured_fut=pre_cp_fut,
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# XXX historically this branch called
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# `aio_task.cancel()` when `_fut_waiter`
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# was None — required to actually terminate
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# aio tasks that aren't parked on a poke-able
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# future (e.g. the `aio_echo_server` loop in
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# `test_echoserver_detailed_mechanics`). Opt
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# into the fallback so we don't regress.
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allow_cancel_fallback=True,
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# carry the trio-side exc (if any) as the
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# cause so the aio-side relay shows the
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# real root-cause chain when re-raised.
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cause=trio_err,
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)
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else:
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aio_taskc_warn: str = (
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f'\n'
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f'MANUALLY Cancelling `asyncio`-task: {aio_task.get_name()}!\n\n'
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f'**THIS CAN SILENTLY SUPPRESS ERRORS FYI\n\n'
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)
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# await tractor.pause()
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report += aio_taskc_warn
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# TODO XXX, figure out the case where calling this makes the
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# `test_infected_asyncio.py::test_trio_closes_early_and_channel_exits`
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# hang and then don't call it in that case!
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#
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aio_task.cancel(msg=aio_taskc_warn)
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report += signal_report
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log.warning(report)
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@ -1161,10 +1288,11 @@ async def translate_aio_errors(
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# `channel._aio_err/._trio_to_raise`) BEFORE calling
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# `maybe_raise_aio_side_err()` below!
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#
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# XXX WARNING NOTE
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# the `task.set_exception(aio_taskc)` call above MUST NOT
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# EXCEPT or this WILL HANG!! SO, if you get a hang maybe step
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# through and figure out why it erroed out up there!
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# NOTE, `wait_on_aio_task` may have been flipped to `False`
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# by `maybe_signal_aio_task()` above when delivery
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# failed (e.g. `_fut_waiter is None`) — in that case we
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# skip the wait since the aio task won't process our
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# relay exc and `_aio_task_complete` may never set.
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#
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if wait_on_aio_task:
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await chan._aio_task_complete.wait()
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@ -1181,6 +1309,47 @@ async def translate_aio_errors(
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- `run_task()`
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'''
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# ===== cross-loop cause-chain matrix =====
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# How `(trio_err, aio_err, trio_to_raise)` resolve into ONE
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# terminal `raise X [from Y]` (or an early `return`).
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#
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# legend (the possible `X` / `Y` operands):
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# - trio_err : `chan._trio_err`, the trio-side exc.
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# - aio_err : `chan._aio_err`, the aio-side exc.
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# - trio_to_raise : `chan._trio_to_raise`, a tractor-chosen
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# relay exc (`AsyncioCancelled`/`AsyncioTaskExited`).
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# - raise_from : `trio_err if (aio_err is trio_to_raise)
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# else aio_err` (the chosen `__cause__`).
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# - relay-echo : an `aio_err` that is one of OUR OWN
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# `TrioTaskExited|TrioCancelled` signals,
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# synth'd + delivered to the aio-side by
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# `maybe_signal_aio_task()`; its `__cause__`
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# is ALREADY `trio_err`.
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# - "(bare)" : raised with NO explicit `from` clause.
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#
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# this block (final-raise in `translate_aio_errors`):
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# condition => raises from
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# ----------------------------------- ------------- -----------
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# not suppress_graceful_exits => trio_to_raise raise_from
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# AsyncioTaskExited + trio Cancelled/None => return (aio-exit ignored)
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# AsyncioTaskExited + trio EoC => trio_err (bare)
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# AsyncioCancelled + trio Cancelled => return (co-cancel ignored)
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# trio_to_raise match catch-all => trio_to_raise raise_from
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# aio_err is relay-echo ◄── the GUARD => trio_err (bare)
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# aio_err independent (real aio fail) => trio_err aio_err
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# aio_err independent, no trio_err => aio_err (bare)
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# only trio_err => trio_err (bare)
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#
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# sibling block (`signal_trio_when_done()`, the aio done-cb):
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# AsyncioTaskExited relay-out => trio_to_raise aio_err
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# plain aio_err re-raise => aio_err (__cause__ preset)
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#
|
||||
# INVARIANT: a relay-echo must NEVER become `trio_err.__cause__`
|
||||
# (it's ALREADY caused-BY `trio_err`) → doing so would CYCLE
|
||||
# (`trio_err ◄─► relay`). So the guard raises the root
|
||||
# `trio_err` bare; the relay still keeps its own correct
|
||||
# "relay ◄ trio_err" chain for any aio-side inspection.
|
||||
# ===== / cross-loop cause-chain matrix =====
|
||||
aio_err: BaseException|None = chan._aio_err
|
||||
trio_to_raise: (
|
||||
AsyncioCancelled|
|
||||
|
|
@ -1237,6 +1406,32 @@ async def translate_aio_errors(
|
|||
and
|
||||
type(aio_err) is not AsyncioCancelled
|
||||
):
|
||||
# XXX, if `aio_err` is one of OUR OWN relay-signals
|
||||
# (`TrioTaskExited`/`TrioCancelled`) that we delivered
|
||||
# to the aio-side via `maybe_signal_aio_task()`, AND
|
||||
# its `__cause__` already points back at `trio_err`,
|
||||
# then it's just a derivative ECHO of the trio-side
|
||||
# error, NOT an independent asyncio failure.
|
||||
#
|
||||
# Raising `trio_err from aio_err` here would invert
|
||||
# (and cyclically tangle) the cause chain since the
|
||||
# relay was itself caused-by `trio_err`:
|
||||
#
|
||||
# trio_err.__cause__ = aio_err (from `raise .. from`)
|
||||
# aio_err.__cause__ = trio_err (set in `maybe_signal_aio_task`)
|
||||
#
|
||||
# So raise the REAL root `trio_err` alone; the relay's
|
||||
# own `__cause__` chain still correctly reads
|
||||
# "TrioTaskExited <- trio_err" for aio-side inspection.
|
||||
if (
|
||||
trio_err is not None
|
||||
and
|
||||
isinstance(aio_err, (TrioTaskExited, TrioCancelled))
|
||||
and
|
||||
aio_err.__cause__ is trio_err
|
||||
):
|
||||
raise trio_err
|
||||
|
||||
# always raise from any captured asyncio error
|
||||
if trio_err:
|
||||
raise trio_err from aio_err
|
||||
|
|
@ -1353,19 +1548,22 @@ async def open_channel_from(
|
|||
# a `Return`-msg for IPC ctxs)
|
||||
aio_task: asyncio.Task = chan._aio_task
|
||||
if not aio_task.done():
|
||||
fut: asyncio.Future|None = aio_task._fut_waiter
|
||||
if fut:
|
||||
fut.set_exception(
|
||||
# capture the in-flight trio-side exc (if any)
|
||||
# so the relay's `__cause__` chain shows the
|
||||
# real root cause when the aio task re-raises.
|
||||
# `sys.exc_info()[1]` is non-`None` only when
|
||||
# the `try` body raised (graceful exit -> None).
|
||||
trio_exc: BaseException|None = sys.exc_info()[1]
|
||||
_, report = maybe_signal_aio_task(
|
||||
aio_task,
|
||||
TrioTaskExited(
|
||||
f'but the child `asyncio` task is still running?\n'
|
||||
f'>>\n'
|
||||
f' |_{aio_task!r}\n'
|
||||
),
|
||||
cause=trio_exc,
|
||||
)
|
||||
)
|
||||
else:
|
||||
# XXX SHOULD NEVER HAPPEN!
|
||||
log.error("SHOULD NEVER GET HERE !?!?")
|
||||
await tractor.pause(shield=True)
|
||||
log.cancel(report)
|
||||
else:
|
||||
chan._to_trio.close()
|
||||
|
||||
|
|
@ -1602,6 +1800,7 @@ def run_as_asyncio_guest(
|
|||
fute_err: BaseException|None = None
|
||||
try:
|
||||
out: Outcome = await asyncio.shield(trio_done_fute)
|
||||
# out: Outcome = await trio_done_fute
|
||||
# ^TODO still don't really understand why the `.shield()`
|
||||
# is required ... ??
|
||||
# https://docs.python.org/3/library/asyncio-task.html#asyncio.shield
|
||||
|
|
|
|||
Loading…
Reference in New Issue