Book Image

Node Cookbook

By : David Mark Clements
Book Image

Node Cookbook

By: David Mark Clements

Overview of this book

The principles of asynchronous event-driven programming are perfect for today's web, where efficient real-time applications and scalability are at the forefront. Server-side JavaScript has been here since the 90's but Node got it right. With a thriving community and interest from Internet giants, it could be the PHP of tomorrow. "Node Cookbook" shows you how to transfer your JavaScript skills to server side programming. With simple examples and supporting code, "Node Cookbook" talks you through various server side scenarios often saving you time, effort, and trouble by demonstrating best practices and showing you how to avoid security faux pas. Beginning with making your own web server, the practical recipes in this cookbook are designed to smoothly progress you to making full web applications, command line applications, and Node modules. Node Cookbook takes you through interfacing with various database backends such as MySQL, MongoDB and Redis, working with web sockets, and interfacing with network protocols, such as SMTP. Additionally, there are recipes on correctly performing heavy computations, security implementations, writing, your own Node modules and different ways to take your apps live.
Table of Contents (16 chapters)
Node Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface

Implementing PubSub with Redis


Redis exposes a Publish-Subscribe messaging pattern (not so dissimilar to the CouchDB changes stream), which can be used to listen to specific data change events. Data from these events could be passed between processes to, for instance, instantly update a web app with fresh new data.

With PubSub, we publish a message to a specific channel, this channel can then be picked up by any amount of subscribers. The publishing mechanism doesn't care who's listening or how many, it chats away regardless.

In this recipe, we will create a publishing process and a subscribing process. For publishing, we'll extend our quotes.js file from the previous recipe Storing and retrieving data with Redis, and we'll write the code to a new file for the subscription mechanism.

Getting ready

Let's create a new directory, copy quotes.js from the previous recipe, and rename it to quotes_publish.js. We will also create a file called quotes_subscribe.js. We'll need to ensure that Redis is...