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29 lines
1.2 KiB
29 lines
1.2 KiB
3 years ago
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from typing import Optional
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from fastapi.concurrency import AsyncExitStack
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from starlette.types import ASGIApp, Receive, Scope, Send
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class AsyncExitStackMiddleware:
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def __init__(self, app: ASGIApp, context_name: str = "fastapi_astack") -> None:
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self.app = app
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self.context_name = context_name
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async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
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if AsyncExitStack:
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dependency_exception: Optional[Exception] = None
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async with AsyncExitStack() as stack:
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scope[self.context_name] = stack
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try:
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await self.app(scope, receive, send)
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except Exception as e:
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dependency_exception = e
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raise e
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if dependency_exception:
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# This exception was possibly handled by the dependency but it should
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# still bubble up so that the ServerErrorMiddleware can return a 500
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# or the ExceptionMiddleware can catch and handle any other exceptions
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raise dependency_exception
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else:
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await self.app(scope, receive, send) # pragma: no cover
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