Django - How to check if server is running in ASGI or in WSGI mode?

Question

We are running the same django project in WSGI mode for handling HTTP requests and in ASGI mode for handling WebSockets. For WSGI mode we are using gunicorn3 server:

gunicorn3 --pythonpath . -b 0.0.0.0:8000 chat_bot.wsgi:application

For ASGI mode we are using daphne server:

daphne --root-path . -b 0.0.0.0 -p 8001 chat_bot.asgi:application

How to programatically detect which mode currently is running GreenUnicorn+WSGI or Daphne+ASGI?

Biancabiancha

Answer 1

One possibility:

Inside of your wsgi.py file you can set an environment variable to one value you won't be setting anywhere else:

os.environ.setdefault('SERVER_GATEWAY_INTERFACE', 'Web')

And then inside of asgi.py set it to a different variable:

os.environ.setdefault('SERVER_GATEWAY_INTERFACE', 'Asynchronous')

Then in other parts of your code, just check against the environment variable:

if os.environ.get('SERVER_GATEWAY_INTERFACE') == 'Web':
    # WSGI, do something
else:
    # ASGI, do something else

Adelaadelaida

why an environment variable and not just setting a global python variable in one of the python modules in the project where it makes sense to store this? – Viscus