Redis Cookbook by O'reilly Media Incorporated; Tiago Macedo; Fred Oliveria
Author:O'reilly Media, Incorporated; Tiago Macedo; Fred Oliveria
Language: eng
Format: mobi
Tags: COMPUTERS / General, Computers, General
ISBN: 9781449305048
Publisher: O'Reilly Media
Published: 2011-07-22T04:59:34+00:00
// When we get a message in one of the channels we're subscribed to,
// we send it over to all connected clients.
rc.on("message", function (channel, message) {
console.log("Sending: " + message);
socketio.sockets.emit('message', message);
})
As you can see, our actual Redis code is extremely simple. All we do is listen for messages on a specific channel, and when they arrive, we broadcast them to all clients that are connected to us.
Implementing the client side code
With the server side part completed, all we have to do is create a small page that connects to Node.js, sets up Socket.IO on the client side, and then deals with incoming and outgoing messages. So let’s create a page like that now. Here’s the main trunk for a very simple HTML5 page:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Chat with Redis</title>
</head>
<body>
<ul id="messages">
<!-- chat messages go here -->
</ul>
</body>
</html>
Now we need to include the two main pieces we need to get the functionality working: jQuery and Socket.IO. We’ll grab the first from Google’s CDN, and the second from our Node.js server (Socket.IO takes care of setting this up for you automatically). Insert these two lines in the head section of your page:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script>
<script src="http://localhost:8000/socket.io/socket.io.js"></script>
We’re now ready to connect to Node.js from this page and start listening to and processing messages. Add the following code to your head section:
<script>
var socket = io.connect('localhost', { port: 8000 });
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