Handling websockets in python

Question

I am developing a messaging service that uses websockets. And I shall be using python/django as a server side language. There are options such as:

1. Tornado
2. django-websockets-redis
3. Crossbar.io
4. Flask-SocketIO

I am confused by what should I be using for the production environment where the number of active connections is large.

Answer 1

Websockets in tornado are relatively straightforward. This example shows how you can integrate websockets with extremely basic management ( open and on_close methods).

For upstream traffic (browser -> server) you can implement the WebSocketHandler methods:

def on_message(self, message):
    # call message callback

def data_received(self, chunk):
    # do something with chunked data

For downstream traffic, there's WebSocketHandler.write_message :

def broadcast_to_all_websockets(self, message):
    for ws in cl:
        if not ws.ws_connection.stream.socket:
            print "Web socket %s does not exist anymore!" % ws
            cl.remove(ws)
        else:
            ws.write_message(message)

Answer 2

Highly suggest using autobahn|Python . Currently using it right now for a WebSocket project in Python and it's so easy to work with and has a lot of classes already built for you like a WebSocketServer. Let's you choose your implementation too (choice between asyncio and Twisted.)