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♻️ Simplify AsyncExitStackMiddleware as without Python 3.6 AsyncExitStack is always available #9657

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Merged
tiangolo merged 1 commit into from
Jun 11, 2023
Merged

♻️ Simplify AsyncExitStackMiddleware as without Python 3.6 AsyncExitStack is always available #9657

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29 changes: 13 additions & 16 deletions fastapi/middleware/asyncexitstack.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,19 +10,16 @@ def __init__(self, app: ASGIApp, context_name: str = "fastapi_astack") -> None:
self.context_name = context_name

async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
if AsyncExitStack:
dependency_exception: Optional[Exception] = None
async with AsyncExitStack() as stack:
scope[self.context_name] = stack
try:
await self.app(scope, receive, send)
except Exception as e:
dependency_exception = e
raise e
if dependency_exception:
# This exception was possibly handled by the dependency but it should
# still bubble up so that the ServerErrorMiddleware can return a 500
# or the ExceptionMiddleware can catch and handle any other exceptions
raise dependency_exception
else:
await self.app(scope, receive, send) # pragma: no cover
dependency_exception: Optional[Exception] = None
async with AsyncExitStack() as stack:
scope[self.context_name] = stack
try:
await self.app(scope, receive, send)
except Exception as e:
dependency_exception = e
raise e
if dependency_exception:
# This exception was possibly handled by the dependency but it should
# still bubble up so that the ServerErrorMiddleware can return a 500
# or the ExceptionMiddleware can catch and handle any other exceptions
raise dependency_exception