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    <p>On my search for exactly the same thing I found this <a href="http://reminiscential.wordpress.com/2012/04/07/realtime-notification-delivery-using-rabbitmq/">blog post of Kevin Jing Qiu</a>.</p> <p>I went the rabbitmq hole a bit further to give every websocket his own set of channel and queues.</p> <p>The extract from my project can be found below. A tornado application bound to RabbitMQ consists of these parts:</p> <ol> <li>The Tornado Application that will handle web requests. I only see long lived websockets here, but you can do so with short lived http requests as well. </li> <li>A (one) RabbitMQ connection hold by the PikaClient Instance</li> <li>a web connection that defines its channels, queues and exchanges when the open method is triggered.</li> </ol> <p>Now a websocket connection can receive data from tornado (data from the browser) via on_message and send it to RabbitMQ. </p> <p>The websocket connection will receive data from RabbitMQ via basic_consume. </p> <p>This is not fully functional, but you should get the idea.</p> <pre><code>class PikaClient(object): def __init__(self, io_loop): logger.info('PikaClient: __init__') self.io_loop = io_loop self.connected = False self.connecting = False self.connection = None self.channel = None self.message_count = 0 """ Pika-Tornado connection setup The setup process is a series of callback methods. connect:connect to rabbitmq and build connection to tornado io loop -&gt; on_connected: create a channel to rabbitmq -&gt; on_channel_open: declare queue tornado, bind that queue to exchange chatserver_out and start consuming messages. """ def connect(self): if self.connecting: #logger.info('PikaClient: Already connecting to RabbitMQ') return #logger.info('PikaClient: Connecting to RabbitMQ') self.connecting = True cred = pika.PlainCredentials('guest', 'guest') param = pika.ConnectionParameters( host='localhost', port=5672, virtual_host='/', credentials=cred ) self.connection = TornadoConnection(param, on_open_callback=self.on_connected,stop_ioloop_on_close=False) self.connection.add_on_close_callback(self.on_closed) def on_connected(self, connection): logger.info('PikaClient: connected to RabbitMQ') self.connected = True self.connection = connection # now you are able to call the pika api to do things # this could be exchange setup for websocket connections to # basic_publish to later. self.connection.channel(self.on_channel_open) def on_channel_open(self, channel): logger.info('PikaClient: Channel %s open, Declaring exchange' % channel) self.channel = channel def on_closed(self, connection): logger.info('PikaClient: rabbit connection closed') self.io_loop.stop() class MyWebSocketHandler(websocket.WebSocketHandler): def __init__(self): self.status = 'not connected yet' def open(self, *args, **kwargs): self.status = "ws open" self.rabbit_connect() # connect this websocket object to rabbitmq def rabbit_connect(): self.application.pc.connection.channel(self.rabbit_channel_in_ok) def rabbit_channel_in_ok(self,channel): self.channel_in = channel self.channel_in.queue_declare(self.rabbit_declare_ok, exclusive=True,auto_delete=True) # and so on... handlers = [ your_definitions_here_like_websockets_or_such ] settings = { your_settings_here } application = tornado.web.Application(handlers,**settings) def main(): io_loop = tornado.ioloop.IOLoop.instance() # PikaClient is our rabbitmq consumer pc = PikaClient(io_loop) application.pc = pc application.pc.connect() application.listen(config.tornadoport) try: io_loop.start() except KeyboardInterrupt: io_loop.stop() if __name__ == '__main__': main() </code></pre>
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    1. POHow to communicate RabbitMQ(Pika library) in tornado application
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