AttributeError: 'types.SimpleNamespace' object has no attribute '__START_TIME__'

[vtdat]

I'm facing this issue with latest sanic-prometheus. It happens when I accessed a non-existed page..

[ERROR] Exception occurred in one of response middleware handlers
Traceback (most recent call last):
  File "/home/.../lib/python3.6/site-packages/sanic/app.py", line 977, in handle_request
    request, response, request_name=name
  File "/home/.../lib/python3.6/site-packages/sanic/app.py", line 1281, in _run_response_middleware
    _response = await _response
  File "/home/.../lib/python3.6/site-packages/sanic_prometheus/__init__.py", line 125, in before_response
    metrics.after_request_handler(request, response, get_endpoint)
  File "/home/.../lib/python3.6/site-packages/sanic_prometheus/metrics.py", line 56, in after_request_handler
    lat = time.time() - request.ctx.__START_TIME__
AttributeError: 'types.SimpleNamespace' object has no attribute '__START_TIME__'

Running:

Ubuntu 20.04
Python 3.6.9
sanic 20.6.3
sanic-prometheus 0.2.1

[dhensen]

I'm experiencing the same thing on sanic 20.12.1 and sanic-prometheus 0.2.1.

Hmmm... I'm 99% sure this happens because I have a request middleware that response early (it conditionally returns a 403 json response).

I think your request-middleware then does not add the START_TIME and then your response-middleware errors out.

(So my case is different, I'm not visiting a non-existent page.)

[vtdat]

I'm experiencing the same thing on sanic 20.12.1 and sanic-prometheus 0.2.1.

Hmmm... I'm 99% sure this happens because I have a request middleware that response early (it conditionally returns a 403 json response).

I think your request-middleware then does not add the START_TIME and then your response-middleware errors out.

(So my case is different, I'm not visiting a non-existent page.)

I think that might be the case here. A PR to fix this would be awesome.

However, you should not assign lat = 0 or it will add 404 requests to metrics.