Flask and Gevent Websocket Mashup

Simplest example of Flask and Gevent Websocket used together.

from flask import Flask
from geventwebsocket import WebSocketServer, WebSocketApplication, Resource
 
app = Flask(__name__)
 
class echo(WebSocketApplication):
    def on_message(self, message):
        self.ws.send(message)
 
@app.route('/')
def hello():
    return """<!DOCTYPE html>
<html>
  <head>
    <script>
    window.onload = function() {
      var ws = new WebSocket("ws://localhost:8080/echo");
 
      ws.onmessage = function(evt) {
        var data = evt.data;
        var el = document.getElementById('response');
        el.innerHTML += '<li>' + data + '</li>';
      };
 
      var el = document.getElementById('message');
      el.onkeypress = function (evt) {
        if (evt.which == 13) {
           ws.send(el.value);
           el.value = '';
        }
      };
    };
    </script>
  </head>
  <body>
    <h1>Echo Example</h1>
    <p>Type a message and press enter.</p>
    <input id="message" type="text"></input>
    <ol id="response">
      <li>Responses show here.</li>
    </ol>
  </body>
</html>"""
 
routes = {'/': app,
          '/echo': echo}
 
server = WebSocketServer(('', 8080), Resource(routes), debug=True)
server.serve_forever()

Trace: » C++ Enum Inheritance Example » Link Directory Listing (old) » Tricky Triangle » Python Attribute Dictionary » Python Treap Implementation » Python Binary Search File By Line » Python Multiprocessing Lazy Iterating Map » Python asynchat Chat Example » A Curious Curve » Flask and Gevent Websocket Mashup

random/flask_and_gevent_websocket_mashup.txt · Last modified: 2013/12/19 03:16 by grant