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29 lines
849 B
Python
29 lines
849 B
Python
"""Process-wide graceful-shutdown flag.
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Raised by ``BoundedDrainUvicornWorker`` when a drain starts and polled by the
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SSE/long-poll generators (which run in a2wsgi threads asyncio can't cancel) so
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they return promptly instead of hanging the worker until the ``--timeout``
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watchdog kills it. Standalone module so the worker can import it without the app.
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"""
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from __future__ import annotations
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import threading
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_shutting_down = threading.Event()
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def begin_shutdown() -> None:
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"""Mark the process as shutting down so streaming generators stop looping."""
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_shutting_down.set()
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def is_shutting_down() -> bool:
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"""Return ``True`` once the server has begun a graceful shutdown."""
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return _shutting_down.is_set()
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def reset_shutdown() -> None:
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"""Clear the shutdown flag. Intended for tests only."""
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_shutting_down.clear()
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