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.
Table of Contents (15 chapters)
Socket.IO Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Pushing up data from the server


Using Socket.IO in a Cordova app is exactly the same as using it on a website. We emit events and listen for events. In the mobile device context, one interesting application is using Socket.IO as an interface over a third-party API. When the mobile device uses Socket.IO to kick off requests to the API, it doesn't have to wait for the request to complete. It will simply get a message when this occurs.

In this recipe, we will use Socket.IO as an interface to make a request to the openweathermap.org API.

Getting ready

To make request to a third-party API, we will use the request library. It can be installed by running npm install request in your command line.

How to do it…

To create a weather app that interfaces with a third-party API, follow these steps:

  1. First, we need to create a new Cordova application. This can be done by running cordova create app com.push.dataPushData in your command line.

  2. Next, add the iOS platform by running cordova platform add ios, and build...