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33 lines
1.1 KiB
33 lines
1.1 KiB
2 years ago
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import sys
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from typing import AsyncGenerator, ContextManager, TypeVar
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from starlette.concurrency import iterate_in_threadpool as iterate_in_threadpool # noqa
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from starlette.concurrency import run_in_threadpool as run_in_threadpool # noqa
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from starlette.concurrency import ( # noqa
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run_until_first_complete as run_until_first_complete,
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)
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if sys.version_info >= (3, 7):
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from contextlib import AsyncExitStack as AsyncExitStack
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from contextlib import asynccontextmanager as asynccontextmanager
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else:
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from contextlib2 import AsyncExitStack as AsyncExitStack # noqa
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from contextlib2 import asynccontextmanager as asynccontextmanager # noqa
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_T = TypeVar("_T")
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@asynccontextmanager
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async def contextmanager_in_threadpool(
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cm: ContextManager[_T],
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) -> AsyncGenerator[_T, None]:
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try:
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yield await run_in_threadpool(cm.__enter__)
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except Exception as e:
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ok: bool = await run_in_threadpool(cm.__exit__, type(e), e, None)
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if not ok:
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raise e
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else:
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await run_in_threadpool(cm.__exit__, None, None, None)
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