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45 lines
1.2 KiB
Python
45 lines
1.2 KiB
Python
5 years ago
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import asyncio
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import collections
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from typing import Any, Optional
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try:
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from typing import Deque
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except ImportError:
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from typing_extensions import Deque # noqa
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class EventResultOrError:
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"""
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This class wrappers the Event asyncio lock allowing either awake the
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locked Tasks without any error or raising an exception.
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thanks to @vorpalsmith for the simple design.
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"""
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def __init__(self, loop: asyncio.AbstractEventLoop) -> None:
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self._loop = loop
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self._exc = None # type: Optional[BaseException]
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self._event = asyncio.Event(loop=loop)
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self._waiters = collections.deque() # type: Deque[asyncio.Future[Any]]
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def set(self, exc: Optional[BaseException]=None) -> None:
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self._exc = exc
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self._event.set()
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async def wait(self) -> Any:
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waiter = self._loop.create_task(self._event.wait())
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self._waiters.append(waiter)
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try:
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val = await waiter
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finally:
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self._waiters.remove(waiter)
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if self._exc is not None:
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raise self._exc
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return val
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def cancel(self) -> None:
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""" Cancel all waiters """
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for waiter in self._waiters:
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waiter.cancel()
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