After adding socketio.RedisManager, the connection is not successful.

[JuneDan]

I am a Python beginner and I am experiencing some issues while using this library. Can you please help me? Thank you very much.

python socketIO server ：

import eventlet
import socketio

mgr = socketio.RedisManager()
sio = socketio.Server(client_manager=mgr, logger=True, engineio_logger=True)
app = socketio.WSGIApp(sio)

@sio.event
def connect(sid, environ):
    print('New connection',sid)

@sio.event
def my_message(sid: str, question: str):
    sio.emit('on_serve_msg',‘ok’)
    

@sio.event
def disconnect(sid):
    print('disconnect ', sid)

if __name__ == '__main__':
    eventlet.wsgi.server(eventlet.listen(('', 5000)), app)

python socketIO client ：

import socketio
sio = socketio.Client(logger=True, engineio_logger=True)

@sio.event
def connect():
    while True:
        string = input('>>')
        my_message(string)

@sio.event
def my_message(data):
    sio.emit('my_message', data)

@sio.event
def disconnect():
    print('disconnected from server')

sio.connect('ws://localhost:5000')
sio.wait()

error（client）：

Attempting polling connection to http://localhost:5000/socket.io/?transport=polling&EIO=4
HTTP GET request to http://localhost:5000/socket.io/?transport=polling&EIO=4&t=1686195897.0514188 failed with error HTTPConnectionPool(host='localhost', port=5000): Read timed out. (read timeout=5).
Traceback (most recent call last):
  File "C:\Users\10351\Desktop\superGPT\gpt_langchain_py\testConnect\eventletSocketIOc.py", line 30, in <module>
    sio.connect('ws://localhost:5000')
  File "C:\Program Files\python\Lib\site-packages\socketio\client.py", line 338, in connect
    raise exceptions.ConnectionError(exc.args[0]) from None
socketio.exceptions.ConnectionError: HTTPConnectionPool(host='localhost', port=5000): Read timed out. (read timeout=5)

[miguelgrinberg]

Did you look at your server logs for clues?

[JuneDan]

May I ask if I need to provide more detailed code?

[JuneDan]

I forgot to mention that Redis is running in Docker, and the mapped port is also 6379.

[miguelgrinberg]

I would suggest adding logs for your web server (passing log_output=True I think, assuming this is eventlet's WSGI server), so that there is more information on your server logs. The logs that you shared indicate a successful connection, not a connection error.

[JuneDan]

Thank you very much for the suggestion, but the server still did not generate any error logs. However, I have solved this problem. I added eventlet.monkey_patch() in the SocketIO server , and the connection was successful. It's amazing, and I'm not sure why. If you know the reason, please let me know. Thank you very much.

[miguelgrinberg]

This is correct. Monkey patching is required when you use eventlet and redis combined. This is mentioned in the documentation, and there is also a runtime error that occurs when monkey patching is not detected:

RuntimeError: Redis requires a monkey patched socket library to work with eventlet

I have tested the above example code you provided and I do get the error. Not sure why you did not see this on your side.