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test.py
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from functools import partial
import redis
import threading
import tornado.web
import tornado.websocket
import tornado.ioloop
import tornado.httpserver
TEMPLATE = """
<!DOCTYPE>
<html>
<head>
<title>Sample test</title>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.4.2.min.js"></script>
</head>
<body>
<h1>Hello world</h1>
<form method='POST' action="./">
<textarea name='data' id="data"></textarea>
<div><input type="submit"></div>
</form>
<div id="log"></div>
<script type="text/javascript" charset="utf-8">
$(document).ready(function(){
$('form').submit(function(event){
var value = $('#data').val();
$.post("./", { data: value }, function(data){
$("#data").val('');
});
return false;
});
if ("WebSocket in window") {
var ws = new WebSocket("ws://localhost:8888/realtime/");
ws.onopen = function() {};
ws.onmessage = function (evt) {
var received_msg = evt.data;
var html = $("#log").html();
html += "<p>"+received_msg+"</p>";
$('#log').html(html);
};
ws.onclose = function () {};
} else {
alert("WebSocket not supported");
}
});
</script>
</body>
</html>
"""
# The listener are the list of WebSocketHandler
LISTENERS = []
def redis_listener():
r = redis.Redis()
ps = r.pubsub()
ps.subscribe('test_realtime')
io_loop = tornado.ioloop.IOLoop.instance()
for message in ps.listen():
for element in LISTENERS:
io_loop.add_callback(partial(element.on_message, message))
class NewMsgHandler(tornado.web.RequestHandler):
def get(self):
self.write(TEMPLATE)
def post(self):
data = self.get_argument('data')
r = redis.Redis()
r.publish('test_realtime', data)
class RealtimeHandler(tornado.websocket.WebSocketHandler):
def open(self):
LISTENERS.append(self)
def on_message(self, message):
self.write_message(message['data'])
def on_close(self):
LISTENERS.remove(self)
settings = {
'auto_reload': True,
}
application = tornado.web.Application([
(r'/', NewMsgHandler),
(r'/realtime/', RealtimeHandler),
], **settings)
if __name__ == "__main__":
threading.Thread(target=redis_listener).start()
http_server = tornado.httpserver.HTTPServer(application)
http_server.listen(8888)
tornado.ioloop.IOLoop.instance().start()