WebSocket server with Tornado

websocket_server.py

#!/usr/bin/python
# -*- coding: utf-8 -*-
# Copyright : (c) SAEKI Yoshiyasu
# License   : MIT-style license
#             <http://www.opensource.org/licenses/mit-license.php>
# last updated: 2010/11/25

import tornado.httpserver
import tornado.ioloop
import tornado.web
import tornado.websocket

connections = []


class Balls(tornado.websocket.WebSocketHandler):
    def open(self):
        print("WebSocket opened")
        if not (self in connections):
            connections.append(self)

    def on_message(self, data):
        for con in connections:
            if con != self:
                print data
                con.write_message(data)

    def on_close(self):
        print("WebSocket closed")
        if self in connections:
            connections.remove(self)

application = tornado.web.Application([
  (r"/balls", Balls),
])


def main():
    http_server = tornado.httpserver.HTTPServer(application)
    http_server.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

if __name__ == "__main__":
    main()