[Solved] Tornado – Listen to multiple clients simultaneously over websockets
I want to use Tornado for creating a websocket server in Python. Here is the API: http://tornado.readthedocs.org/en/latest/websocket.html
In the APIs, I do not see an option to get a handle for the client. How do I handle multiple client connections at the same time?
on_message(self, message) method directly gives the message. Doesn’t contain any handle for the client who has connected.
I would want to receive client requests, do some processing (which might take a long time), and then reply back to the client. I am looking for a client handle which I can use to reply back at a later time.
As I understand you want something like this:
class MyWebSocketHandler(tornado.websocket.WebSocketHandler): # other methods def on_message(self, message): # do some stuff with the message that takes a long time self.write_message(response)
Every websocket connection has its own object from your subclassed WebSocketHandler.
You can even save the connection and use it elsewhere:
ws_clients =  class MyWebSocketHandler(tornado.websocket.WebSocketHandler): # other methods def open(self): if self not in ws_clients: ws_clients.append(self) def on_close(self): if self in ws_clients: ws_clients.remove(self) def send_message_to_all(self, message): for c in ws_clients: c.write_message(message)