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