Demo-abandonment on shielded `trio`-side work

Finally this reproduces the issue as it (originally?) exhibited inside
`piker` where the `Actor.lifetime_stack` wasn't closed in cases where
during `infected_aio`-actor cancellation/shutdown `trio` side tasks
which are doing shielded (teardown) work are NOT being watched/waited on
from the `aio_main()` task-closure inside `run_as_asyncio_guest()`!

This is then the root cause of the guest-run being abandoned since if
our `aio_main()` task-closure doesn't know it should allow the run to
finish, it's going to call `loop.close()` eventually resulting in the
`GeneratorExit` thrown into `trio._core._run.unrolled_run()`..

So, this extends the `test_sigint_closes_lifetime_stack()` suite to
include cases for such shielded `trio`-task ops:
- add a new `trio_side_is_shielded: bool` which will toggle whether to
  add a shielded 0.5s `trio.sleep()` loop to `manage_file()` which
  should outlive the `asyncio` event-loop shutdown sequence and result
  in an abandoned guest-run and thus a leaked file.
- parametrize the existing suite with this case resulting in a total 16
  test set B)

This patch demonstrates the problem with our `aio_main()` task-closure
impl via the now 4 failing tests, a fix is coming in a follow up commit!
aio_abandons
Tyler Goodlet 2024-06-26 11:44:31 -04:00
parent 4f1db1ff52
commit 268bd0d8ec
1 changed files with 23 additions and 5 deletions

View File

@ -644,6 +644,7 @@ async def manage_file(
ctx: tractor.Context,
tmp_path_str: str,
send_sigint_to: str,
trio_side_is_shielded: bool = True,
bg_aio_task: bool = False,
):
'''
@ -693,11 +694,6 @@ async def manage_file(
# => ????? honestly i'm lost but it seems to be some issue
# with `asyncio` and SIGINT..
#
# XXX NOTE XXX SO, if this LINE IS UNCOMMENTED and
# `run_as_asyncio_guest()` is written WITHOUT THE
# `.cancel_soon()` soln, both of these tests will pass ??
# so maybe it has something to do with `asyncio` loop init
# state?!?
# honestly, this REALLY reminds me why i haven't used
# `asyncio` by choice in years.. XD
#
@ -715,6 +711,15 @@ async def manage_file(
# os.getpid(),
# signal.SIGINT,
# )
# XXX spend a half sec doing shielded checkpointing to
# ensure that despite the `trio`-side task ignoring the
# SIGINT, the `asyncio` side won't abandon the guest-run!
if trio_side_is_shielded:
with trio.CancelScope(shield=True):
for i in range(5):
await trio.sleep(0.1)
await trio.sleep_forever()
# signalled manually at the OS level (aka KBI) by the parent actor.
@ -726,6 +731,17 @@ async def manage_file(
raise RuntimeError('shoulda received a KBI?')
@pytest.mark.parametrize(
'trio_side_is_shielded',
[
False,
True,
],
ids=[
'trio_side_no_shielding',
'trio_side_does_shielded_work',
],
)
@pytest.mark.parametrize(
'send_sigint_to',
[
@ -768,6 +784,7 @@ def test_sigint_closes_lifetime_stack(
tmp_path: Path,
wait_for_ctx: bool,
bg_aio_task: bool,
trio_side_is_shielded: bool,
debug_mode: bool,
send_sigint_to: str,
):
@ -793,6 +810,7 @@ def test_sigint_closes_lifetime_stack(
tmp_path_str=str(tmp_path),
send_sigint_to=send_sigint_to,
bg_aio_task=bg_aio_task,
trio_side_is_shielded=trio_side_is_shielded,
) as (ctx, first):
path_str, cpid = first