App Engine (python) skips webapp middleware (like Appstats) in production but works fine on dev server

Question

I'm using App Engine python to host an application and would love to use Appstats and a couple of other libraries that run as middleware. However, when I set up middleware through appengine_config.py (as shown below) it works on the dev server but not in production. Appstats AND gaesessions work like a charm in the dev server and don't work at all in production. Here is my appengine_config.py, located in my root /src dir:

from com.impactpy.gaesessions import SessionMiddleware 
COOKIE_KEY = 'nice try' 
def webapp_add_wsgi_middleware(app): 
    from google.appengine.ext.appstats import recording 
    app = SessionMiddleware(app, cookie_key=COOKIE_KEY) 
    app = recording.appstats_wsgi_middleware(app) 
    return app 

Any ideas?

UPDATE

So I'm bringing this back up as I've tried again to fix it to no avail. I've boiled appengine_config.py down to:

from google.appengine.ext.appstats import recording

def webapp_add_wsgi_middleware(app):
    app = recording.appstats_wsgi_middleware(app)
    return app

and app.yaml includes

builtins:
- datastore_admin: on
- remote_api: on
- appstats: on

My app uses basic webapp, bottom of every request-handling file includes:

application = webapp.WSGIApplication( [
    ('/handler', myHandlerClass)
    ],debug=True)

def main():
    run_wsgi_app(application)

if __name__ == "__main__":
    main()

Deploying works fine. App has been going strong for over a year and sees lots of requests. myapp.appspot.com/_ah/stats comes up showing the GUI with a refresh button, no data, and the message "No requests have been recorded yet" etc. I'm confused!

Answer 1

I think the problem is how you import SessionMiddleware. Try to put gaesessions at the top level of your project directory.

Here is an appengine_config.py I used successfully:

from gaesessions import SessionMiddleware
from google.appengine.ext.appstats import recording

def webapp_add_wsgi_middleware(app):
    app = SessionMiddleware(app, cookie_key="s3cr3t")
    app = recording.appstats_wsgi_middleware(app)
    return app