Using public channels with Python

Using public channels with Python

Public channels do not require authentication. Public channels can be used for features without sensitive information, such as these use cases:

• Notify all users with the e-commerce page loaded when a new product goes on sale.
• Live chat similar to YouTube chat.
• Trigger updates for all clients currently viewing a page when it changes.

Frontend

<html>
    <body>
       <h1>Pusher test</h1> 
      <script>
        document.addEventListener('DOMContentLoaded', function() {
            var pusher = new Pusher("RESSONANCE_APP_ID", {
                cluster: "default",
                wsHost: "websocket.ressonance.com",
                wsPort: 443,                  
                wssPort: 443,                 
                forceTLS: true,               
                disableStats: true,            
                enabledTransports: ["ws", "wss"]
            });

            var channel = pusher.subscribe("public-channel");

            channel.bind("new-release", (data) => {
                alert("New release", data.release);
            });
        });
      </script>
      <script src="https://js.pusher.com/8.3.0/pusher.min.js"></script>  
    </body>
</html>

Backend

pip install pusher

This is a small Python example application.

# File main.py
import json
from http.server import BaseHTTPRequestHandler, HTTPServer
import pusher


pusher_client = pusher.Pusher(
    app_id="RESSONANCE_APP_ID",
    key="RESSONANCE_APP_KEY",
    secret="RESSONANCE_APP_SECRET",
    host="websocket.ressonance.com",
    port=443,
    ssl=True,
)


class Handler(BaseHTTPRequestHandler):
    def send_json(self, status_code, payload):
        self.send_response(status_code)
        self.send_header("Access-Control-Allow-Origin", "*")
        self.send_header("Access-Control-Allow-Methods", "GET,POST,OPTIONS")
        self.send_header("Access-Control-Allow-Headers", "Content-Type")
        self.send_header("Content-Type", "application/json")
        self.end_headers()
        self.wfile.write(json.dumps(payload).encode("utf-8"))

    def do_OPTIONS(self):
        self.send_response(204)
        self.send_header("Access-Control-Allow-Origin", "*")
        self.send_header("Access-Control-Allow-Methods", "GET,POST,OPTIONS")
        self.send_header("Access-Control-Allow-Headers", "Content-Type")
        self.end_headers()

    def do_GET(self):
        if self.path == "/send-public-event":
            pusher_client.trigger("public-channel", "new-release", {"release": "hello world"})
            self.send_json(200, {"message": "Event sent!"})
            return

        self.send_json(404, {"message": "Not found."})


if __name__ == "__main__":
    server = HTTPServer(("0.0.0.0", 5000), Handler)
    server.serve_forever()