Issues with Flask-SocketIO + uWSGI + Nginx setup

[schizoprada]

Hello, I am in the process of patching an update to my app, however, I'm running into some issues I wasn't facing during local development. At first I was able to get the client to successfully emit to the server, but not the inverse, all this amidst a see of warning and errors, including handshake failure. After messing around with some stuff in my VM, I got the handshake to start working, and the connection is being upgraded to websocket, but its as if now after the initial connection nothing is sending, either from server to client or vice versa.

Some context:
Im instantiating socketio in my main app file where I register my blueprints, but since I only really need it for one blueprint atm I've wrapped it in a function that takes the socketio as an arg and returns the blueprint before registering it

from blueprints.dialogue import convo
socketio = SocketIO(app, async_mode='gevent_uwsgi', cors_allowed_origins=['https://sss.bot', 'http://localhost:*', 'wss://sss.bot', 'ws://localhost:*'], logger=True, engineio_logger=True)
app.extensions['socketio'] = socketio
dialoguebp = convo(socketio)
app.register_blueprint(dialoguebp, url_prefix='/dialogue')

if __name__ == '__main__':
    socketio.run(app, debug=True, host='0.0.0.0', port=8888)
    app.run(debug=True, host='0.0.0.0', port=8888)

then in the dialogue blueprint, using standard on and emit for example:

    @socketio.on('UsrMsg')
    def User(message):
        logger.log(I, f"{current_user.username} | User Message: {message}")
        session.pop('RecentRun', None) if 'RecentRun' in session else None
        client.beta.threads.messages.create(thread_id=session['thread'], role="user", content=message)
        run = client.beta.threads.runs.create(thread_id=session['thread'], assistant_id=m0d.f4rwrd2()) # run the assistant
        session['RecentRun'] = run.id
        m0d.Poll(run.id)

on the matching dialogue.js ive got:

var socket = io('wss://sss.bot/dialogue', {
  path: '/socket.io/', withCredentials: true, transports: ["websocket", "polling"] 
});

in my uWSGI .ini:

[uwsgi]
module = callcenter:app
master = true
processes = 1
socket = /home/joel/sss/sss.sock
chmod-socket = 666
vacuum = true
die-on-term = true
buffer-size = 32768
gevent = 100
http-websockets = true
http-timeout = 120
socket-timeout = 120
harakiri = 150
logto = /home/joel/sss/logs/uwsgi.log

and In my nginx sites-available:

server {
    listen 80;
    server_name sss.bot www.sss.bot;
    return 301 https://$server_name$request_uri;
}

server {
    listen 443 ssl;
    server_name sss.bot www.sss.bot;

    ssl_certificate /etc/ssl/certs/www_sss_bot.crt;
    ssl_certificate_key /etc/ssl/private/sss.key;
    ssl_trusted_certificate /etc/ssl/certs/www_sss_bot.ca-bundle;

    location ^~ /.well-known/pki-validation/ {
        root /home/joel/sss/static;
        allow all;
    }

    location / {
        include uwsgi_params;
        uwsgi_pass unix:/home/joel/sss/sss.sock;
    }

    location /socket.io {    
        include uwsgi_params;
        uwsgi_pass unix:/home/joel/sss/sss.sock;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-NginX-Proxy true;
        proxy_redirect off;	
    }

}

I would go more into depth about the errors, but ive switched stuff around so much and got so many different kinds of errors (and success) that im genuinely lost. Any and all help would be much appreciated! thanks in advance

[miguelgrinberg]

I believe the uwsgi protocol does not support WebSocket, I suggest you try regular HTTP proxying instead.

[schizoprada]

ok I modified the socket.io location directive in my sites-available file to replace:

    location /socket.io {    
        include uwsgi_params;
        uwsgi_pass unix:/home/joel/sss/sss.sock;

with:

    location /socket.io {    
        proxy_pass http://127.0.0.1:8888;

and now in the web console im seeing:

[Warning] [blocked] The page at https://sss.bot/ai/ was not allowed to run insecure content from ws://localhost:8888/socket.io/?EIO=4&transport=websocket. (socket.io.js, line 1603)

[Error] WebSocket connection error: – Error: websocket error
Error: websocket error
	(anonymous function) (shmooze.js:6)
	(anonymous function) (socket.io.js:636)
	onerror (socket.io.js:3337)
	(anonymous function) (socket.io.js:636)
	(anonymous function) (socket.io.js:4094)
	(anonymous function) (socket.io.js:636)
	onError (socket.io.js:2439)
	(anonymous function) (socket.io.js:636)
	onError (socket.io.js:798)
[Error] Error details: – {message: "websocket error", type: "TransportError", description: Event}
{message: "websocket error", type: "TransportError", description: Event}Object
	(anonymous function) (shmooze.js:7)
	(anonymous function) (socket.io.js:636)
	onerror (socket.io.js:3337)
	(anonymous function) (socket.io.js:636)
	(anonymous function) (socket.io.js:4094)
	(anonymous function) (socket.io.js:636)
	onError (socket.io.js:2439)
	(anonymous function) (socket.io.js:636)
	onError (socket.io.js:798)
[Error] WebSocket connection failed: WebSocket is closed before the connection is established.
	doClose (socket.io.js:1703)
	close (socket.io.js:828)
	onClose (socket.io.js:2457)
	onError (socket.io.js:2440)
	(anonymous function) (socket.io.js:636)
	onError (socket.io.js:798)

[miguelgrinberg]

Why is your client complaining about port 8888? The client should only talk to nginx, it should never connect to your internal services directly.

[schizoprada]

Not sure but managed to get sockets working by switching out Flask-SocketIO for simple-websocket and deploying with gunicorn threads instead of worker-class. Thx for the help