Heroku websocket to websocket communication

Question

I'm trying to implement an invite system for my game using Heroku and websockets. I have tried the official Heroku example but it doesn't work.

Here is the basic app:

from flask import Flask
from flask-sock import Sock

app = Flask(__name__)
sock = Sock(app)

messages = []

@app.route('/')
def index():
    return "Nothing here..."

@sock.route("/submit")
def inbox(ws):
    while True:
        msg = ws.receive()
        ws.send("Message received.")
        messages.append(msg)

@sock.route("/receive")
def outbox(ws):
    while True:
        for msg in messages:
            ws.send(msg)

Even something as simple as that doesn't work, and from the tests I've run it seems like it's because each websocket connection is getting it's own instance of messages , and it seems like in the Heroku example it's the same deal with self.clients .

Here's my requirements.txt:

click==8.1.3
colorama==0.4.5
Flask==2.2.2
flask-sock==0.5.2
gunicorn==20.1.0
h11==0.13.0
importlib-metadata==4.12.0
itsdangerous==2.1.2
Jinja2==3.1.2
MarkupSafe==2.1.1
passlib==1.7.4
psycopg2-binary==2.9.3
simple-websocket==0.8.0
Werkzeug==2.2.2
wsproto==1.1.0
zipp==3.8.1
requests==2.26.0
redis==4.3.4
gevent==21.12.0

and my Procfile:

web: gunicorn app:app --timeout 200

and my runtime.txt:

python-3.9.6

What I want is essentially a way to send data from one websocket to another without having to query a database constantly. Any help is greatly appreciated.

Answer 1

You have imported flask_sock package not flask_socket package. this is confusing ik there are other packages websockets, socketio and they have similar syntaxes. try making the backenf from websockets to deploy it easily on heroku.