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WEBSOCKETS
Embracing the real-time Web
Rob Hawkes
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Created by Phil Banks (@emirpprime)
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What are WebSockets?
Nothing to do with plugs
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Why use WebSockets?
They’re pretty cool
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Multiplayer Web gaming
Communicating between players
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Live streaming content
Live and instant updates
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Draft-76, Draft-06 & Draft-07
Knowing the difference is important
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Browser support
Pretty decent, but not ideal
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Using WebSockets is easy
You gotta love a simple JavaScript API
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var ws = new WebSocket("ws://127.0.0.1:8080");
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var ws = new MozWebSocket("ws://127.0.0.1:8080");
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var ws = new WebSocket("ws://127.0.0.1:8080");
ws.onopen = function() {
console.log("Connected to WebSocket server");
};
ws.onclose = function() {
console.log("Disconnected");
};
ws.onmessage = function(msg) {
console.log("Message received: "+msg.data);
};
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var ws = new WebSocket("ws://127.0.0.1:8080");
...
ws.send(“Hello, world!”);
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var ws = new WebSocket("ws://127.0.0.1:8080");
...
ws.close();
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WebSockets on the server
You need something to connect to
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npm install websocket
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var WebSocketServer = require("websocket").server;
var http = require("http");
var server = http.createServer(function(request, response) {});
server.listen(8080, function() {
console.log("Server is listening on port 8080");
});
var ws = new WebSocketServer({
httpServer: server,
autoAcceptConnections: true
});
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...
ws.on("connect", function(conn) {
console.log("Connection accepted");
conn.on("message", function(message) {
if (message.type === "utf8") {
console.log("Received Message: "+message.utf8Data);
conn.sendUTF(message.utf8Data);
};
});
conn.on("close", function(conn) {
console.log("Client "+conn.remoteAddress+" disconnected");
});
});
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Fallback for old browsers
Now you can support everyone
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var io = require("socket.io").listen(8080);
io.sockets.on("connection", function (socket) {
socket.on("message", function (data) {
socket.emit(data);
});
});
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Socket.IO is just awesome
It goes beyond the basics
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WebSockets gotchas
These tripped me up the first time
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Using external services
You don’t always have to roll your own
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What WebSockets needs
The future is bright-ish
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Rawkets.com
HTML5 & WebSockets game.
Twitter sentiment analysis
Delving into your soul.
RECENT PROJECTS
Rawkes.com
Personal website and blog
MORE COOL STUFF
ExplicitWeb.co.uk
Web development podcast.
Mozilla Technical Evangelist
My job
ROB HAWKES
@robhawkes
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DEV DERBY
Experimenting with the latest Web technologies
Manipulate video with canvas
DEVELOPER.MOZILLA.ORG/EN-US/DEMOS/DEVDERBY
Every month
This month is HTML5 video
Win prizes (like an Android)
Next month is all about touch
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THANK YOU
Any questions?
Rob Hawkes
@robhawkes