pythonasyncioapiasyncfastapiframeworkjsonjson-schemaopenapiopenapi3pydanticpython-typespython3redocreststarletteswaggerswagger-uiuvicornweb
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47 lines
1.4 KiB
47 lines
1.4 KiB
from typing import Any, Callable
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from starlette.concurrency import iterate_in_threadpool # noqa
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from starlette.concurrency import run_in_threadpool # noqa
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from starlette.concurrency import run_until_first_complete # noqa
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asynccontextmanager_error_message = """
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FastAPI's contextmanager_in_threadpool require Python 3.7 or above,
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or the backport for Python 3.6, installed with:
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pip install async-generator
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"""
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def _fake_asynccontextmanager(func: Callable) -> Callable:
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def raiser(*args: Any, **kwargs: Any) -> Any:
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raise RuntimeError(asynccontextmanager_error_message)
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return raiser
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try:
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from contextlib import asynccontextmanager # type: ignore
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except ImportError:
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try:
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from async_generator import asynccontextmanager # type: ignore
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except ImportError: # pragma: no cover
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asynccontextmanager = _fake_asynccontextmanager
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try:
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from contextlib import AsyncExitStack # type: ignore
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except ImportError:
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try:
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from async_exit_stack import AsyncExitStack # type: ignore
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except ImportError: # pragma: no cover
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AsyncExitStack = None # type: ignore
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@asynccontextmanager
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async def contextmanager_in_threadpool(cm: Any) -> Any:
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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 = 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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