AttributeError in opentelemetry-instrumentation-aiohttp-server

Describe your environment

OS: Ubuntu 22.04
Python version: 3.10.12
Package version: 0.47b0

What happened?

I have a web app written with aiohttp and followed the installation instructions of the opentelemetry SDK.

I did not see the app misbehave, but I noticed an exception that

1. was printed to STDOUT and
2. was sent to the otel collector

Steps to Reproduce

• I started SigNoz locally (with the default docker-compose file).
• I started with an already existing web app based on aiohttp.
• I installed the OTEL SDK and ran opentelemetry-bootstrap.
• I defined some env. vars and ran the server.

$ cat .env2
OTEL_PYTHON_LOGGING_AUTO_INSTRUMENTATION_ENABLED="true"
OTEL_SERVICE_NAME="demo"
OTEL_EXPORTER_OTLP_ENDPOINT="http://localhost:4318"
OTEL_PYTHON_LOG_CORRELATION="true"
OTEL_PYTHON_LOG_LEVEL="debug"
OTEL_METRICS_EXPORTER="otlp"
OTEL_METRIC_INTERVAL=5000
$ . .env2
$ opentelemetry-instrument --service_name demo gunicorn demo:app --bind 0.0.0.0:8080 --worker-class aiohttp.GunicornWebWorker

Unfortunately, I'm uncertain about the steps until noticing the traceback, but SigNoz suggests that the traceback was printed from a trace/span that was handling a websocket connection.

Expected Result

I would expect to see no traceback

Actual Result

Traceback on STDOUT

[2024-10-11 15:07:40 +0200] [86402] [ERROR] Error handling request
Traceback (most recent call last):
  File "/home/andi/virtualenvs/checkers/lib/python3.10/site-packages/aiohttp/web_protocol.py", line 477, in _handle_request
    resp = await request_handler(request)
  File "/home/andi/virtualenvs/checkers/lib/python3.10/site-packages/aiohttp/web_app.py", line 559, in _handle
    return await handler(request)
  File "/home/andi/virtualenvs/checkers/lib/python3.10/site-packages/aiohttp/web_middlewares.py", line 117, in impl
    return await handler(request)
  File "/home/andi/virtualenvs/checkers/lib/python3.10/site-packages/opentelemetry/instrumentation/aiohttp_server/__init__.py", line 231, in middleware
    set_status_code(span, resp.status)
AttributeError: 'NoneType' object has no attribute 'status'

Traceback in SigNoz

Traceback (most recent call last):
  File "/home/andi/virtualenvs/checkers/lib/python3.10/site-packages/opentelemetry/trace/__init__.py", line 583, in use_span
    yield span
  File "/home/andi/virtualenvs/checkers/lib/python3.10/site-packages/opentelemetry/sdk/trace/__init__.py", line 1108, in start_as_current_span
    yield span
  File "/home/andi/virtualenvs/checkers/lib/python3.10/site-packages/opentelemetry/instrumentation/aiohttp_server/__init__.py", line 231, in middleware
    set_status_code(span, resp.status)
AttributeError: 'NoneType' object has no attribute 'status'

Additional context

No response

Would you like to implement a fix?

None

Start in opentelemetry/instrumentation/aiohttp_server/init.py at the middleware around line 231, then reproduce the reported aiohttp setup with the websocket scenario described. Done means the request completes without the NoneType traceback being printed or sent to the collector.