Bartosz Zaczyński (Grand Parade Poland) - WebSocket for Dummies
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Presentation created by Bartosz Zaczyński from Grand Parade Poland. Prepared for Startup LAB #6 - Real Time Web apps, event hosted by Business Link Kraków.
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Bartosz Zaczyński (Grand Parade Poland) - WebSocket for Dummies
- 9. Example: Betradar TCP/SSL @tornado.gen.coroutine def receive(self): """Read CRLF-delimited messages and push them onto the queue.""" try: if not self.iostream.closed(): message_body = yield self.iostream.read_until('rnrn') logger.debug('Received message: %s', message_body.strip()) received_at = datetime.datetime.utcnow() message = parser.parse(message_body, received_at) if message is not None: if self.is_whitelisted(message): self.messages.enqueue(message) self.log(message) self.ioloop.add_callback(self.receive) except tornado.iostream.StreamClosedError: if not self._closing: logger.error('Betradar connection closed by remote endpoint') self.heartbeat.stop() if self.on_closed: self.on_closed()
- 13. WebSocket: JavaScript API <!DOCTYPE html> <html> <head> <title>WebSocket Demo</title> <script> var ws = new WebSocket("ws://localhost:8080/websocket"); ws.onopen = function(event) { console.log("open"); }; ws.onclose = function(event) { console.log("closed"); }; ws.onerror = function(event) { console.log("error"); }; ws.onmessage = function(event) { console.log(event.data); }; function onButtonClick() { ws.send(document.getElementById("message").value) } </script> </head> <body> <input type="text" id="message"> <button type="button" onclick="onButtonClick();">Send</button> </body> </html>
- 14. WebSocket: JavaScript libs var ws = STOMP.over(new SockJS("/websocket")); var ws = io.connect("http://localhost:8080/websocket");
- 16. Debugging