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from typing import Optional
from fastapi.concurrency import AsyncExitStack
from starlette.types import ASGIApp, Receive, Scope, Send
class AsyncExitStackMiddleware:
def __init__(self, app: ASGIApp, context_name: str = "fastapi_astack") -> None:
self.app = app
self.context_name = context_name
async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
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
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