#🔒 Asyncio Server Problem

107 messages · Page 1 of 1 (latest)

median daggerBOT
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@frosty grove

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frosty grove
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Once again, server runs fine, 0 issues. Suddenly, i'll see it stops receving incoming connections for no apparent reason.

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When i cntrl C, no unhandled exceptions or anything unexpected

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@trail raven

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Dont wanna bother u, but ur smart

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and im on the verge of a meltdown

dawn plover
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    asyncio.create_task(tick()), await asyncio.Event().wait()
``` you should probably hold a strong reference to the tick task
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or use a TaskGroup

frosty grove
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for no i need to know whats causing this problem

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and thats not it

dawn plover
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having blank excepts will prevent exceptions from propagating

dawn plover
frosty grove
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cus i just added that

dawn plover
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the GC could be collecting that task and killing everything

frosty grove
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and it was different before

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it was different before

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and had same issues

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it was this before

frosty grove
hearty spruce
frosty grove
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i used to do that

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also didnt change much

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but i'll add it anyways

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just to see

hearty spruce
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I just assume there's some resource leak, if it's 'fails after n minutes', so look at any cleanup.

frosty grove
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thanks man, any help is so good rn

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cus im so tired

frosty grove
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i have a feeling it has something to do with start

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idk

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all i know is the coroutine isnt being cancelled.

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its super strange man

frosty grove
hearty spruce
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I'll refer you to nedbat's wisdom: #python-discussion message

frosty grove
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i dont wanna be rude to him.

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oh u mean the message

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lmao

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i thought u meant him

trail raven
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what seems to be the prob

frosty grove
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I should add that it once actually died like less than a minute after running

trail raven
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did you add the canary task like I asked you to?

frosty grove
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no

trail raven
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why?

frosty grove
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cus idk what that is

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and im not sure if its needed

trail raven
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I explained it to you

frosty grove
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often the mistakes i make are stupid

trail raven
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and why you need it

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you need it so that when it stops outputting text, you know the event loop is stuck

frosty grove
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will canary task show me exactly where it when wrong

trail raven
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no, but it will confirm that the event loop is stuck

frosty grove
frosty grove
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im waiting for something to go wrong again

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and ill see

trail raven
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well, there is a way to get a stack trace from another thread

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so if you detect, from another thread, that the event loop is stuck, you can use this technique to find out what the event loop thread is doing

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do you have your current code up somewhere?

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sys._current_frames() is the key function here

frosty grove
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^

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@trail raven

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ok ye

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@trail raven

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its the event loop altogether

trail raven
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that's your old code, from when you opened this help channel?

frosty grove
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see

trail raven
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it's still spawning threads

frosty grove
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i dont use threads

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at all

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btw

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for this

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or threading

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i removed it like u told me to

trail raven
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well, I just opened the pastes you linked to

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and there are threads

frosty grove
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send pic

trail raven
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that picture tells me nothing

frosty grove
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for what tho

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for dns servers

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yes

trail raven
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I want to see what we're working with

frosty grove
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thats unrelated

frosty grove
trail raven
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what do I mean? you have a problem with code, so maybe let me see what that code looks like?

frosty grove
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here

trail raven
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you really should either store the tasks somewhere or use a task group

frosty grove
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bro

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im trying to figure out whats going on with these event loop rn

trail raven
frosty grove
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oh

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lols

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see

trail raven
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reading the docs helps, sometimes

frosty grove
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dumb mistake

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this doesnt include asyncio.run()?

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right

trail raven
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right

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task groups make this easy

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and they also ensure that exceptions aren't lost

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if you can't upgrade to Python 3.12 (where asyncio.TaskGroupis available), you can use AnyIO and its create_task_group()

frosty grove
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Thank you so much btw

trail raven
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np

median daggerBOT
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🔒 Asyncio Server Problem