Book Image

Mastering Node.js

By : Sandro Pasquali
Book Image

Mastering Node.js

By: Sandro Pasquali

Overview of this book

Node.js is a modern development stack focused on providing an easy way to build scalable network software. Backed by a growing number of large companies and a rapidly increasing developer base, Node is revolutionizing the way that software is being built today. Powered by Google's V8 engine and built out of C++ modules, this is a JavaScript environment for the enterprise.Mastering Node.js will take the reader deep into this exciting development environment. Beginning with a comprehensive breakdown of its innovative non-blocking evented design, Node's structure is explained in detail, laying out how its blazingly fast I/O performance simplifies the creation of fast servers, scalable architectures, and responsive web applications.Mastering Node.js takes you through a concise yet thorough tour of Node's innovative evented non-blocking design, showing you how to build professional applications with the help of detailed examples.Learn how to integrate your applications with Facebook and Twitter, Amazon and Google, creating social apps and programs reaching thousands of collaborators on the cloud. See how the Express and Path frameworks make the creation of professional web applications painless. Set up one, two, or an entire server cluster with just a few lines of code, ready to scale as soon as you're ready to launch. Move data seamlessly between databases and file systems, between clients, and across network protocols, using a beautifully designed, consistent, and predictable set of tools.Mastering Node.js contains all of the examples and explanations you'll need to build applications in a short amount of time and at a low cost, running on a scale and speed that would have been nearly impossible just a few years ago.
Table of Contents (20 chapters)
Mastering Node.js
Credits
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
Index

Handling sessions


How does a server know if the current client request is part of a chain of previous requests? Web applications engage with clients through long transactional chains—the shopping cart containing items to buy will still be there even if a shopper navigates away to do some comparison-shopping. We will call this a session, which may contain any number of KV pairs, such as a username, product list, or the user's login history.

How are sessions started, ended, and tracked? There are many ways to attack this problem, depending on many factors existing in different ways on different architectures. In particular, if more than one server is being used to handle clients, how is session data shared between them?

We will use cookies to store session IDs for clients, while building a simple long-polling server. Keep in mind that as applications grow in complexity this simple system will need to be extended. As well, long-polling as a technology is giving ground to the more powerful socket...