chfw/tornado websocket brodcasting minimal example

## tornado websocket brodcasting minimal example
from tornado.websocket import WebSocketHandler
from tornado.web import Application, RequestHandler
from tornado.ioloop import IOLoop


HTML = """
<html>
<div id="messages"></div>
<script>
var ws = new WebSocket("ws://localhost:8888/websocket");
ws.onopen = function() {
   ws.send("Hello, world");
};
ws.onmessage = function (evt) {
   var the_div = document.getElementById("messages");
   the_div.innerHTML = evt.data + "<br>" +  the_div.innerHTML;
};
</script>
</html>

"""


class MainHandler(RequestHandler):
    def get(self):
        self.write(HTML)


class EchoWebSocket(WebSocketHandler):
    clients = []

    def open(self):
        self.clients.append(self)
        print("WebSocket opened")

    def on_message(self, message):
        for client in self.clients:
            client.write_message("You said:" + message)

    def on_close(self):
        print("WebSocket closed")


def make_app():
    return Application([
        (r"/websocket", EchoWebSocket),
        (r"/", MainHandler),
    ])


if __name__ == "__main__":
    app = make_app()
    app.listen(8888)
    IOLoop.current().start()
	from tornado.websocket import WebSocketHandler
	from tornado.web import Application, RequestHandler
	from tornado.ioloop import IOLoop


	HTML = """
	<html>
	<div id="messages"></div>
	<script>
	var ws = new WebSocket("ws://localhost:8888/websocket");
	ws.onopen = function() {
	ws.send("Hello, world");
	};
	ws.onmessage = function (evt) {
	var the_div = document.getElementById("messages");
	the_div.innerHTML = evt.data + "<br>" + the_div.innerHTML;
	};
	</script>
	</html>

	"""


	class MainHandler(RequestHandler):
	def get(self):
	self.write(HTML)


	class EchoWebSocket(WebSocketHandler):
	clients = []

	def open(self):
	self.clients.append(self)
	print("WebSocket opened")

	def on_message(self, message):
	for client in self.clients:
	client.write_message("You said:" + message)

	def on_close(self):
	print("WebSocket closed")


	def make_app():
	return Application([
	(r"/websocket", EchoWebSocket),
	(r"/", MainHandler),
	])


	if __name__ == "__main__":
	app = make_app()
	app.listen(8888)
	IOLoop.current().start()