The Scheduler
a42b1ff04e
Issue Manager / issue-manager (push) Has been cancelled
Build Docs / changes (push) Has been cancelled
Build Docs / langs (push) Has been cancelled
Build Docs / build-docs (push) Has been cancelled
Build Docs / docs-all-green (push) Has been cancelled
Conflict detector / main (push) Has been cancelled
Test Redistribute / test-redistribute (fastapi) (push) Has been cancelled
Test Redistribute / test-redistribute (fastapi-slim) (push) Has been cancelled
Test Redistribute / test-redistribute-alls-green (push) Has been cancelled
Test / lint (push) Has been cancelled
Test / test (pydantic-v1, 3.10) (push) Has been cancelled
Test / test (pydantic-v1, 3.11) (push) Has been cancelled
Test / test (pydantic-v1, 3.13) (push) Has been cancelled
Test / test (pydantic-v1, 3.8) (push) Has been cancelled
Test / test (pydantic-v1, 3.9) (push) Has been cancelled
Test / test (pydantic-v2, 3.10) (push) Has been cancelled
Test / test (pydantic-v2, 3.11) (push) Has been cancelled
Test / test (pydantic-v2, 3.12) (push) Has been cancelled
Test / test (pydantic-v2, 3.13) (push) Has been cancelled
Test / test (pydantic-v2, 3.14) (push) Has been cancelled
Test / test (pydantic-v2, 3.8) (push) Has been cancelled
Test / test (pydantic-v2, 3.9) (push) Has been cancelled
Test / coverage-combine (push) Has been cancelled
Test / check (push) Has been cancelled
Label Approved / label-approved (push) Has been cancelled
FastAPI People Contributors / job (push) Has been cancelled
FastAPI People Sponsors / job (push) Has been cancelled
Update Topic Repos / topic-repos (push) Has been cancelled
FastAPI People / job (push) Has been cancelled
Test / test (pydantic-v1, 3.12) (push) Has been cancelled
40 lines
1.4 KiB
Python
40 lines
1.4 KiB
Python
from contextlib import asynccontextmanager as asynccontextmanager
|
|
from typing import AsyncGenerator, ContextManager, TypeVar
|
|
|
|
import anyio.to_thread
|
|
from anyio import CapacityLimiter
|
|
from starlette.concurrency import iterate_in_threadpool as iterate_in_threadpool # noqa
|
|
from starlette.concurrency import run_in_threadpool as run_in_threadpool # noqa
|
|
from starlette.concurrency import ( # noqa
|
|
run_until_first_complete as run_until_first_complete,
|
|
)
|
|
|
|
_T = TypeVar("_T")
|
|
|
|
|
|
@asynccontextmanager
|
|
async def contextmanager_in_threadpool(
|
|
cm: ContextManager[_T],
|
|
) -> AsyncGenerator[_T, None]:
|
|
# blocking __exit__ from running waiting on a free thread
|
|
# can create race conditions/deadlocks if the context manager itself
|
|
# has its own internal pool (e.g. a database connection pool)
|
|
# to avoid this we let __exit__ run without a capacity limit
|
|
# since we're creating a new limiter for each call, any non-zero limit
|
|
# works (1 is arbitrary)
|
|
exit_limiter = CapacityLimiter(1)
|
|
try:
|
|
yield await run_in_threadpool(cm.__enter__)
|
|
except Exception as e:
|
|
ok = bool(
|
|
await anyio.to_thread.run_sync(
|
|
cm.__exit__, type(e), e, e.__traceback__, limiter=exit_limiter
|
|
)
|
|
)
|
|
if not ok:
|
|
raise e
|
|
else:
|
|
await anyio.to_thread.run_sync(
|
|
cm.__exit__, None, None, None, limiter=exit_limiter
|
|
)
|