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
About the Author
About the Reviewers

Accessing CouchDB changes stream with Cradle

One of CouchDB's most noteworthy features is the _changes API. With it we can view all alterations to a database via HTTP.

For instance, to see all changes made to our quotes database we can make a GET request to http://localhost:5984/quotes/_changes. Even better, if we wanted to hook up to a live stream, we would add the query parameter ?feed=continuous.

Cradle provides an attractive interface to the _changes API, which we'll explore in this recipe.

Getting ready

We'll need a functioning CouchDB database and a way to write to it. We can use the quotes.js example used in Storing data to CouchDB with Cradle, so let's copy that into a new directory and then create a file alongside it called quotes_stream.js.

If we followed the Creating an admin user and Locking all modifying operations to an admin user sections of the previous recipe's There's more... section, we will need to modify the second line of quotes.js in order to continue to insert quotes...