last_event_id() returns None after SentryAsgiMiddleware.__call__() finished

I’m unable to access last_event_id of SentryAsgiMiddleware on exception handler in Starlette framework.

from sentry_sdk import last_event_id
from sentry_sdk.integrations.asgi import SentryAsgiMiddleware
from starlette.applications import Starlette
from starlette.responses import JSONResponse
from starlette.routing import Route


async def test_endpoint(request):
    raise RuntimeError("test")


def exception_handler(*args, **kwargs):
    return JSONResponse({"last_event_id": last_event_id()})


app = Starlette(
    routes=[Route('/', test_endpoint)],
    exception_handlers={
        Exception: exception_handler,
    }
)
app.add_middleware(SentryAsgiMiddleware)

the problem is probably with usage of Hub’s context manager in SentryAsgiMiddleware._run_app() - after throwing exception you are clearing local ContextVar so last_event_id function tries to access wrong Hub instance.

[untitaker]

Actually I have an idea, give me a couple hours

[kamilglod]

confirm - works fine with double SentryAsgiMiddleware middleware and this fix.