marcosferr/chatroom

copied from https://github.com/reflex-dev/reflex-examples/tree/main/chatroom

running this service

• pip install reflex
• reflex init
• reflex run

chatroom

A multi-client chat room.

broadcast_event

This function iterates through all states in the app, applying the Event payload against each state instance. The resulting change list is passed off to pynecone.app.EventNamespace.emit() directly.

Either event handlers or other out-of-band callbacks can use this API to emit Events from the server as if they originated from the client. This preserves the simple State and Event Handler conceptual model, while allowing server-to-client communication and state updates at will.

send_message

broadcast_event is used in the send_message event handler, which broadcasts the state.incoming_message event to all connected clients, with the details of the message. This in itself doesn't trigger any network traffic, unless the state update creates a delta.

nick_change

When the user sets or changes their nick, the event handler first updates the local state, as usual. Then it awaits, broadcast_nicks which collects the full nick list from the State instance of each connected client by iterating over app.state_manager.states values.

The same broadcast_event mechanism described above is then used to pass the nick list via the state.set_nicks event to all connected clients.