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Use `delay=0` in pump loop.. 

Turns out it does work XD

Prior presumption was from before I had the fute poll-loop so makes
sense we needed more then one sched-tick's worth of context switch vs.
now we can just keep looping-n-pumping as fast possible until the
guest-run's main task completes.

Also,
- minimize the preface commentary (as per todo) now that we have tests
  codifying all the edge cases :finger_crossed:
- parameter-ize the pump-loop-cycle delay and default it to 0.
aio_abandons
Tyler Goodlet 2024-06-27 19:27:59 -04:00
parent 2ac999cc3c
commit 5739e79645
1 changed files with 55 additions and 61 deletions
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116
tractor/to_asyncio.py
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@ -558,6 +558,8 @@ def run_as_asyncio_guest(
# normally `Actor._async_main()` as is passed by some boostrap # normally `Actor._async_main()` as is passed by some boostrap
# entrypoint like `._entry._trio_main()`. # entrypoint like `._entry._trio_main()`.
_sigint_loop_pump_delay: float = 0,
) -> None: ) -> None:
# ^-TODO-^ technically whatever `trio_main` returns.. we should # ^-TODO-^ technically whatever `trio_main` returns.. we should
# try to use func-typevar-params at leaast by 3.13! # try to use func-typevar-params at leaast by 3.13!
@ -598,7 +600,7 @@ def run_as_asyncio_guest(
''' '''
loop = asyncio.get_running_loop() loop = asyncio.get_running_loop()
trio_done_fut = asyncio.Future() trio_done_fute = asyncio.Future()
startup_msg: str = ( startup_msg: str = (
'Starting `asyncio` guest-loop-run\n' 'Starting `asyncio` guest-loop-run\n'
'-> got running loop\n' '-> got running loop\n'
@ -633,13 +635,13 @@ def run_as_asyncio_guest(
f'{error}\n\n' f'{error}\n\n'
f'{tb_str}\n' f'{tb_str}\n'
) )
trio_done_fut.set_exception(error) trio_done_fute.set_exception(error)
# raise inline # raise inline
main_outcome.unwrap() main_outcome.unwrap()
else: else:
trio_done_fut.set_result(main_outcome) trio_done_fute.set_result(main_outcome)
startup_msg += ( startup_msg += (
f'-> created {trio_done_callback!r}\n' f'-> created {trio_done_callback!r}\n'
@ -660,7 +662,7 @@ def run_as_asyncio_guest(
) )
fute_err: BaseException|None = None fute_err: BaseException|None = None
try: try:
out: Outcome = await asyncio.shield(trio_done_fut) out: Outcome = await asyncio.shield(trio_done_fute)
# NOTE will raise (via `Error.unwrap()`) from any # NOTE will raise (via `Error.unwrap()`) from any
# exception packed into the guest-run's `main_outcome`. # exception packed into the guest-run's `main_outcome`.
@ -697,83 +699,75 @@ def run_as_asyncio_guest(
f' |_{actor}.cancel_soon()\n' f' |_{actor}.cancel_soon()\n'
) )
# TODO: reduce this comment bloc since abandon issues are # XXX WARNING XXX the next LOCs are super important, since
# now solved? # without them, we can get guest-run abandonment cases
# where `asyncio` will not schedule or wait on the `trio`
# guest-run task before final shutdown! This is
# particularly true if the `trio` side has tasks doing
# shielded work when a SIGINT condition occurs.
# #
# XXX NOTE XXX the next LOC is super important!!! # We now have the
# => without it, we can get a guest-run abandonment case # `test_infected_asyncio.test_sigint_closes_lifetime_stack()`
# where asyncio will not trigger `trio` in a final event # suite to ensure we do not suffer this issues
# loop cycle! # (hopefully) ever again.
# #
# our test, # The original abandonment issue surfaced as 2 different
# `test_infected_asyncio.test_sigint_closes_lifetime_stack()` # race-condition dependent types scenarios all to do with
# demonstrates how if when we raise a SIGINT-signal in an infected # `asyncio` handling SIGINT from the system:
# child we get a variable race condition outcome where
# either of the following can indeterminately happen,
# #
# - "silent-abandon": `asyncio` abandons the `trio` # - "silent-abandon" (WORST CASE):
# guest-run task silently and no `trio`-guest-run or # `asyncio` abandons the `trio` guest-run task silently
# `tractor`-actor-runtime teardown happens whatsoever.. # and no `trio`-guest-run or `tractor`-actor-runtime
# this is the WORST (race) case outcome. # teardown happens whatsoever..
# #
# - OR, "loud-abandon": the guest run get's abaondoned "loudly" with # - "loud-abandon" (BEST-ish CASE):
# `trio` reporting a console traceback and further tbs of all # the guest run get's abaondoned "loudly" with `trio`
# the failed shutdown routines also show on console.. # reporting a console traceback and further tbs of all
# the (failed) GC-triggered shutdown routines which
# thankfully does get dumped to console..
# #
# our test can thus fail and (has been parametrized for) # The abandonment is most easily reproduced if the `trio`
# the 2 cases: # side has tasks doing shielded work where those tasks
# ignore the normal `Cancelled` condition and continue to
# run, but obviously `asyncio` isn't aware of this and at
# some point bails on the guest-run unless we take manual
# intervention..
# #
# - when the parent raises a KBI just after # To repeat, *WITHOUT THIS* stuff below the guest-run can
# signalling the child, # get race-conditionally abandoned!!
# |_silent-abandon => the `Actor.lifetime_stack` will
# never be closed thus leaking a resource!
# -> FAIL!
# |_loud-abandon => despite the abandonment at least the
# stack will be closed out..
# -> PASS
# #
# - when the parent instead simply waits on `ctx.wait_for_result()` # XXX SOLUTION XXX
# (i.e. DOES not raise a KBI itself), # ------ - ------
# |_silent-abandon => test will just hang and thus the ctx # XXX FIRST PART:
# and actor will never be closed/cancelled/shutdown # ------ - ------
# resulting in leaking a (file) resource since the # the obvious fix to the "silent-abandon" case is to
# `trio`/`tractor` runtime never relays a ctxc back to # explicitly cancel the actor runtime such that no
# the parent; the test's timeout will trigger.. # runtime tasks are even left unaware that the guest-run
# -> FAIL! # should be terminated due to OS cancellation.
# |_loud-abandon => this case seems to never happen??
# #
# XXX FIRST PART XXX, SO, this is a fix to the
# "silent-abandon" case, NOT the `trio`-guest-run
# abandonment issue in general, for which the NEXT LOC
# is apparently a working fix!
actor.cancel_soon() actor.cancel_soon()
# XXX NOTE XXX pump the `asyncio` event-loop to allow # ------ - ------
# XXX SECOND PART:
# ------ - ------
# Pump the `asyncio` event-loop to allow
# `trio`-side to `trio`-guest-run to complete and # `trio`-side to `trio`-guest-run to complete and
# teardown !! # teardown !!
# #
# *WITHOUT THIS* the guest-run can get race-conditionally abandoned!! # oh `asyncio`, how i don't miss you at all XD
# XD while not trio_done_fute.done():
#
await asyncio.sleep(.1) # `delay` can't be 0 either XD
while not trio_done_fut.done():
log.runtime( log.runtime(
'Waiting on main guest-run `asyncio` task to complete..\n' 'Waiting on main guest-run `asyncio` task to complete..\n'
f'|_trio_done_fut: {trio_done_fut}\n' f'|_trio_done_fut: {trio_done_fute}\n'
) )
await asyncio.sleep(.1) await asyncio.sleep(_sigint_loop_pump_delay)
# XXX: don't actually need the shield.. seems to # XXX is there any alt API/approach like the internal
# make no difference (??) and we know it spawns an # call below but that doesn't block indefinitely..?
# internal task..
# await asyncio.shield(asyncio.sleep(.1))
# XXX alt approach but can block indefinitely..
# so don't use?
# loop._run_once() # loop._run_once()
try: try:
return trio_done_fut.result() return trio_done_fute.result()
except asyncio.exceptions.InvalidStateError as state_err: except asyncio.exceptions.InvalidStateError as state_err:
# XXX be super dupere noisy about abandonment issues! # XXX be super dupere noisy about abandonment issues!