flask_socket.io _ problem with running async tasks

Question

I have this configuration on my flask project :

in requrement.txt:

flask_socketio
eventlet

in my app.py :

from flask_socketio import SocketIO
socketio = SocketIO(app, async_mode="eventlet")


@socketio.on('register')
async def register(data):

    await my_asyncfunction(data['machine_id'])

and my_asyncfunction:

async def my_asyncfunction(data):
   ....

and this is my error:

/usr/local/lib/python3.7/threading.py:870: RuntimeWarning: coroutine 'my_asyncfunction' was never awaited self._target(*self._args, **self._kwargs)RuntimeWarning: Enable tracemalloc to get the object allocation traceback

so I tried the option async_mode="eventlet" but same error :(

Miguel Grinberg · Accepted Answer · 2020-12-20 00:05:04Z

2

Neither Flask, Flask-SocketIO nor eventlet support asyncio, you cannot mix regular and async functions in this way.

If your application uses asyncio functions, then you have to drop Flask, Flask-SocketIO and eventlet, and instead use python-socketio, which does support asyncio.

answered Dec 20, 2020 at 0:05

Miguel Grinberg

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2 Comments

Babak Abadkheir Over a year ago

tnx for reply . so the scenario here is. I have flask for HTTP request and socket-io flask for handling tiny microservice workers. which workers connect to my backend. after connection established between worker and server . worker sends the machine-id(mac address) for registration in the cloud(pods in Kubernetes). so this registration have to awaited and response needs to emit to that worker. so how should I handle this problems?

Miguel Grinberg Over a year ago

See the Flask-SocketIO documentation for examples of how to use Socket.IO with Flask. As I said in my answer, you cannot use asyncio in a Flask application.

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