CancelledError when instrumenting FastAPI streaming endpoint running with Granian

[WaterKnight1998]

Describe your environment

OS: (e.g, Ubuntu): macOs Sequoia 15.3.1
Python version: 3.11.9
Packages version:

opentelemetry-api 1.30.0
opentelemetry-exporter-otlp 1.30.0
opentelemetry-exporter-otlp-proto-common 1.30.0
opentelemetry-exporter-otlp-proto-grpc 1.30.0
opentelemetry-exporter-otlp-proto-http 1.30.0
opentelemetry-instrumentation 0.51b0
opentelemetry-instrumentation-asgi 0.51b0
opentelemetry-instrumentation-dbapi 0.51b0
opentelemetry-instrumentation-django 0.51b0
opentelemetry-instrumentation-fastapi 0.51b0
opentelemetry-instrumentation-flask 0.51b0
opentelemetry-instrumentation-psycopg2 0.51b0
opentelemetry-instrumentation-requests 0.51b0
opentelemetry-instrumentation-urllib 0.51b0
opentelemetry-instrumentation-urllib3 0.51b0
opentelemetry-instrumentation-wsgi 0.51b0
opentelemetry-proto 1.30.0
opentelemetry-resource-detector-azure 0.1.5
opentelemetry-sdk 1.30.0
opentelemetry-semantic-conventions 0.51b0
opentelemetry-util-http 0.51b0

granian 1.7.6

What happened?

[INFO] Starting granian (main PID: 93606)
[INFO] Listening at: http://127.0.0.1:8000
[INFO] Spawning worker-1 with pid: 93608
[INFO] Started worker-1
[INFO] Started worker-1 runtime-1
[ERROR] Application callable raised an exception
Traceback (most recent call last):
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/granian/_futures.py", line 11, in future_watcher
    await inner(watcher.scope, watcher.proto)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/fastapi/applications.py", line 1054, in __call__
    await super().__call__(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/applications.py", line 123, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/middleware/errors.py", line 164, in __call__
    await self.app(scope, receive, _send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/opentelemetry/instrumentation/asgi/__init__.py", line 743, in __call__
    await self.app(scope, otel_receive, otel_send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/middleware/exceptions.py", line 65, in __call__
    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    await app(scope, receive, sender)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/routing.py", line 756, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/routing.py", line 776, in app
    await route.handle(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/routing.py", line 297, in handle
    await self.app(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/routing.py", line 77, in app
    await wrap_app_handling_exceptions(app, request)(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    await app(scope, receive, sender)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/routing.py", line 75, in app
    await response(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/responses.py", line 258, in __call__
    async with anyio.create_task_group() as task_group:
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/anyio/_backends/_asyncio.py", line 771, in __aexit__
    raise exc_val
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/responses.py", line 265, in __call__
    await wrap(partial(self.listen_for_disconnect, receive))
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/responses.py", line 261, in wrap
    await func()
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/responses.py", line 238, in listen_for_disconnect
    message = await receive()
              ^^^^^^^^^^^^^^^
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/opentelemetry/instrumentation/asgi/__init__.py", line 816, in otel_receive
    message = await receive()
              ^^^^^^^^^^^^^^^
CancelledError: Future cancelled.

Steps to Reproduce

import asyncio

from fastapi import FastAPI
from fastapi.responses import StreamingResponse
from opentelemetry.instrumentation.fastapi import FastAPIInstrumentor

app = FastAPI()


def number_stream():
    async def generator():
        for i in range(10):
            yield f"{i}\n"
            await asyncio.sleep(1)

    return generator()


@app.get("/stream")
def stream():
    return StreamingResponse(number_stream(), media_type="text/plain")


FastAPIInstrumentor.instrument_app(app)

curl -X GET 'http://127.0.0.1:8000/stream'

Expected Result

No errors

Actual Result

[INFO] Starting granian (main PID: 93606)
[INFO] Listening at: http://127.0.0.1:8000
[INFO] Spawning worker-1 with pid: 93608
[INFO] Started worker-1
[INFO] Started worker-1 runtime-1
[ERROR] Application callable raised an exception
Traceback (most recent call last):
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/granian/_futures.py", line 11, in future_watcher
    await inner(watcher.scope, watcher.proto)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/fastapi/applications.py", line 1054, in __call__
    await super().__call__(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/applications.py", line 123, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/middleware/errors.py", line 164, in __call__
    await self.app(scope, receive, _send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/opentelemetry/instrumentation/asgi/__init__.py", line 743, in __call__
    await self.app(scope, otel_receive, otel_send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/middleware/exceptions.py", line 65, in __call__
    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    await app(scope, receive, sender)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/routing.py", line 756, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/routing.py", line 776, in app
    await route.handle(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/routing.py", line 297, in handle
    await self.app(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/routing.py", line 77, in app
    await wrap_app_handling_exceptions(app, request)(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/_exception_handler.py", line 53, in wrapped_app
    await app(scope, receive, sender)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/routing.py", line 75, in app
    await response(scope, receive, send)
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/responses.py", line 258, in __call__
    async with anyio.create_task_group() as task_group:
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/anyio/_backends/_asyncio.py", line 771, in __aexit__
    raise exc_val
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/responses.py", line 265, in __call__
    await wrap(partial(self.listen_for_disconnect, receive))
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/responses.py", line 261, in wrap
    await func()
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/starlette/responses.py", line 238, in listen_for_disconnect
    message = await receive()
              ^^^^^^^^^^^^^^^
  File "/Users/waterknight1998/Documents/granian-test/.venv/lib/python3.11/site-packages/opentelemetry/instrumentation/asgi/__init__.py", line 816, in otel_receive
    message = await receive()
              ^^^^^^^^^^^^^^^
CancelledError: Future cancelled.

Additional context

No response

Would you like to implement a fix?

None