Book Image

Socket.IO Cookbook

By : Tyson Cadenhead
Book Image

Socket.IO Cookbook

By: Tyson Cadenhead

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.

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Socket.IO Cookbook
Tyson Cadenhead
Oct, 2015 | 184 pages
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Table of Contents (15 chapters)
Socket.IO Cookbook
Socket.IO Cookbook
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Wiring It Up
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
2
Creating Real-Time Dashboards
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
3
Having Two-Way Conversations
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
4
Building a Room with a View
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
5
Securing Your Data
Securing Your Data
Introduction
Implementing basic authentication
Performing token-based authentication
Handling server-side validation
Locking down the HTTP referrer
Using secure WebSockets
6
Performing a Load Balancing Act
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
7
Streaming Binary Data
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
8
Integrating with Mobile Applications
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
Index

Handling connection timeouts

When we perform a real-time application development, it is important to be aware of when the server-side WebSocket connection is dropped, and we will no longer be able to communicate with our server. This allows you to provide an offline mode for our apps, where we can keep a record of all the events that need to be emitted to the server once the connection is re-established.

Socket.IO has some really great built-in functionalities to re-establish the connection once it has been dropped. This is accomplished by creating recurring polling requests to the server until a new connection is found or until the number of reconnection attempts we allow are exceeded.

Getting ready

For this recipe, we will use Express to serve our Socket.IO application. Most of the magic in this recipe will take place on the client side, so the server is really not as important as long as it is a functional server that hosts Socket.IO.

How to do it…

To handle connection timeouts in Socket...

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