Namespaces can also be assigned to keep things neatly separated, and the send() or emit() functions can be used to send ‘message’ or custom events respectively – see the details on Miguel’s page.
On the client side, a little bit of Java Script wizardry with j Query is used to handle incoming and trigger outgoing events.
In this specific example, we want the server to be continually working in the background generating new information, while at the same time allowing new clients to connect, and pushing new information to connected clients.
For this purpose, we’ll be using the Python threading module to create a thread that generates random numbers regularly, and emits the newest value to all connected clients.
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Hence, in application.py, we define a thread object that will continually create random numbers and emit them using socket IO separately to the main flask process:#Random Number Generator Thread thread = Thread() thread_stop_event = Event() class Random Thread(Thread): def __init__(self): self.delay = 1 super(Random Thread, self).__init__() def random Number Generator(self): """ Generate a random number every 1 second and emit to a socketio instance (broadcast) Ideally to be run in a separate thread?
Flask served web pages that react to events on the server.
For example, allowing events like a continually updating message stream, a notification system, or a specific Twitter monitor / display.
In this post, I show how to develop a bare-bones Python Flask application that updates connected clients with random numbers.
I would really recommend the Java Script path on Code School if you are not familiar with these technologies.
And that, effectively, is the bones of sending messages between client and server.