106 lines
2.8 KiB
Python
106 lines
2.8 KiB
Python
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'''
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Complex edge case where during real-time streaming the IPC tranport
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channels are wiped out (purposely in this example though it could have
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been an outage) and we want to ensure that despite being in debug mode
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(or not) the user can sent SIGINT once they notice the hang and the
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actor tree will eventually be cancelled without leaving any zombies.
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'''
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import trio
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from tractor import (
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open_nursery,
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context,
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Context,
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MsgStream,
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)
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async def break_channel_silently_then_error(
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stream: MsgStream,
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):
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async for msg in stream:
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await stream.send(msg)
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# XXX: close the channel right after an error is raised
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# purposely breaking the IPC transport to make sure the parent
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# doesn't get stuck in debug or hang on the connection join.
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# this more or less simulates an infinite msg-receive hang on
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# the other end.
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# if msg > 66:
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await stream._ctx.chan.send(None)
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assert 0
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async def close_stream_and_error(
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stream: MsgStream,
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):
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async for msg in stream:
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await stream.send(msg)
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# wipe out channel right before raising
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await stream._ctx.chan.send(None)
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await stream.aclose()
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assert 0
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@context
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async def recv_and_spawn_net_killers(
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ctx: Context,
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**kwargs,
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) -> None:
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'''
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Receive stream msgs and spawn some IPC killers mid-stream.
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'''
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await ctx.started()
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async with (
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ctx.open_stream() as stream,
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trio.open_nursery() as n,
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):
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for i in range(100):
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await stream.send(i)
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if i > 80:
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n.start_soon(break_channel_silently_then_error, stream)
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n.start_soon(close_stream_and_error, stream)
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async def main(
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debug_mode: bool = True,
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) -> None:
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async with open_nursery(
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# NOTE: even debugger is used we shouldn't get
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# a hang since it never engages due to broken IPC
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debug_mode=debug_mode,
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) as n:
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portal = await n.start_actor(
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'chitty_hijo',
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enable_modules=[__name__],
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)
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async with portal.open_context(
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recv_and_spawn_net_killers,
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) as (ctx, sent):
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async with ctx.open_stream() as stream:
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for i in range(100):
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await stream.send(i)
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with trio.move_on_after(2) as cs:
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rx = await stream.receive()
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print(f'I a mad user and here is what i got {rx}')
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if cs.cancelled_caught:
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# pretend to be a user seeing no streaming action
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# thinking it's a hang, and then hitting ctl-c..
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print("YOO i'm a user and, thingz hangin.. CTL-C CTRL-C..")
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raise KeyboardInterrupt
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if __name__ == '__main__':
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trio.run(main)
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