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Node stop paths cancelled their background task and then caught CancelledError around the await, which swallows a cancellation aimed at the caller — the trap Supervisor._cancel already documents. One shared Node._cancel_task now waits the way the supervisor does; mqtt's publisher and subscription and delay's cron call it. The api container also collected zombie python workers: orphaned when --reload replaces the process holding their handle, they reparent onto a PID 1 that reaps nothing but its own. `init: true` on the backend service.
32 lines
946 B
Python
32 lines
946 B
Python
"""Tearing a node down must not swallow a cancellation meant for the caller."""
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import asyncio
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import pytest
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from fluksio.flow.nodes import DelayNode
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def test_stop_cron_lets_the_callers_cancellation_through():
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async def stubborn() -> None:
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"""A loop whose shutdown does not answer the first cancellation."""
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try:
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await asyncio.sleep(3600)
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except asyncio.CancelledError:
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await asyncio.sleep(3600)
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async def scenario() -> None:
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node = DelayNode(params={"cron": "* * * * *"})
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node._stop_cron = asyncio.Event()
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node._cron_task = asyncio.create_task(stubborn())
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stopping = asyncio.create_task(node.stop_cron())
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await asyncio.sleep(0.05) # let it reach the await on the cron task
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stopping.cancel()
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with pytest.raises(asyncio.CancelledError):
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await stopping
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node._cron_task.cancel()
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asyncio.run(scenario())
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