Socket.IO Cookbook

Socket.IO Cookbook

By : Tyson Cadenhead

Buy this Book

Socket.IO Cookbook

By: Tyson Cadenhead

Buy this Book

Overview of this book

Socket.IO is a JavaScript library that provides you with the ability to implement real-time analytics, binary streaming, instant messaging, and document collaboration. It has two parts: a client-side library that runs in the browser, and a server-side library for node.js. Socket.IO is event-driven and primarily uses the WebSocket protocol that allows us to emit data bi-directionally from the server and the client. Socket.IO This book is a complete resource, covering topics from webSocket security to scaling the server-side of a Socket.IO application and everything in between. This book will provide real-world examples of how secure bi-directional, full-duplex connections that can be created using Socket.IO for different environments. It will also explain how the connection vulnerabilities can be resolved for large numbers of users and huge amounts of data/messages. By the end of the book, you will be a competent Socket.IO developer. With the help of the examples and real-world solutions,you will learn to create fast, scalable, and dynamic real-time apps by creating efficient messaging systems between the server side and the client side using Socket.IO.

Socket.IO Cookbook

Credits

About the Author

About the Reviewers

www.PacktPub.com

Preface

Free Chapter

Wiring It Up

Introduction

Creating a Node HTTP server with Socket.IO

Creating an Express server with Socket.IO

Using Socket.IO as a cross-browser WebSocket

Debugging on the client

Debugging on the server

Creating Real-Time Dashboards

Introduction

Loading static data from the server

Creating a server-side clock

Loading data from MongoDB

Real-time analytics

Handling connection timeouts

Having Two-Way Conversations

Introduction

Creating a simple chat room

Managing the socket life cycle

Emitting a private message to another socket

Sending messages to all the sockets, except for the sender

Building a multiplayer tic-tac-toe game

Building a Room with a View

Introduction

Creating chat channels with namespaces

Joining rooms

Leaving rooms

Listing rooms the socket is in

Creating private rooms

Setting up a default room

Securing Your Data

Introduction

Implementing basic authentication

Performing token-based authentication

Handling server-side validation

Locking down the HTTP referrer

Using secure WebSockets

Performing a Load Balancing Act

Introduction

Performing load balancing with the Nginx server

Using the Node.js cluster

Using Redis to pass events between nodes

Using Memcached to manage multiple nodes

Using RabbitMQ to message events across nodes

Streaming Binary Data

Introduction

Broadcasting an image to other sockets

Uploading an image to the filesystem

Uploading an image to Amazon S3

Streaming audio

Streaming live video

Integrating with Mobile Applications

Introduction

Throwing an alert when the socket connects

Pushing up data from the server

Responding to tap events from the device

Doing server-side pagination

Triggering hot deploys

Index

Customer Reviews

5 star

4 star

3 star

2 star

1 star

Managing the socket life cycle

If our server maintains a list of our connected sockets, it should always be mindful of when a socket disconnects.

A socket can disconnect for any number of reasons:

The user may navigate away from the web page that the WebSocket connection is on
The user's Internet may go down

When these things happen, we can tap into the disconnect event to notify the client side that the socket is no longer available.

How to do it…

To remove references from disconnected sockets, follow these steps:

First, listen for the socket disconnect event on the server side. When this occurs, we will emit an event back to the clients with the ID of the socket that was disconnected. Socket.IO associates every socket with a unique ID, which we can use to manage our sockets. Here is the server-side code:
```
io.on('connection', function (socket) {
io.emit('user.add', socket.id);

socket.on('disconnect', function () {
io.emit('user.remove', socket.id)
    });
});
```
Then, add an element to your view that...

Socket.IO Cookbook

By : Tyson Cadenhead

Socket.IO Cookbook

By: Tyson Cadenhead

Overview of this book

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Socket.IO Cookbook

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