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Home > Web Development > Web Programming > Modern JavaScript Applications
Modern JavaScript Applications
Modern JavaScript Applications

Modern JavaScript Applications: Keep abreast of the practical uses of modern JavaScript

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Modern JavaScript Applications

Chapter 2. Building a Coupon Site

The best way to understand Seneca and microservices architecture is by building a server-side application that would benefit from the microservices architecture. In previous chapter, we saw how large and complex server-side application benefits from the microservices architecture and why enterprises use microservices architecture. In this chapter, we will build a coupon website to practically demonstrate the benefits of using microservices architecture and Seneca to create a server-side application. While building this coupon site, you will also learn how to design a server-side application using the microservices architecture from scratch, how to split the functionality of the application into services, how a client can directly communicate with the services, and many other things.

Some of the things that we will cover in this chapter, apart from things related to Seneca and microservices architecture, are as follows:

  • Using the seneca-mongo-store...

Getting started

The coupon site that we will build will allow users to submit coupons. For the coupon to be publicly visible, the administrator of the site should accept the coupon. Every coupon will have an image attached to it that will be stored and served by an image storage server.

We will be using MongoDB to store the coupons. Before you continue further, make sure that you have MongoDB installed and running. I am assuming that you have basic knowledge of MongoDB.

The exercise files contain two directories: Initial and Final. Inside the Final directory, you will find the complete coupon site source code. In the Initial directory, you will find the HTML code and directories for the monolithic core, services, image storage server, and so on. You will put code related to them in their respective directories. The Initial directory will help you quickly get started with building the coupon site.

We won't get into designing the frontend of our coupon site. We will only be concentrating...

Architecture of our site

Our server-side application will be composed of a monolithic core, three services, MongoDB server, and image storage server.

The monolithic core will serve pages to the site visitors and administrators.

The three services are database service, URL configuration service, and upload service. The following is what each of these services do:

  • Database service: Adding, retrieving, updating, and deleting coupons in MongoDB is done through database service. The monolithic core retrieves coupons from MongoDB through database service, and upload service stores coupons through database service.
  • Upload service: When a user submits a coupon, the HTML form is submitted to the upload service. The upload service then sends the image to the image storage server and adds metadata about the coupon to the database using the database service. We moved these operations to a different service, because if we are resizing and converting the uploaded image, then it will consume more memory and...

Creating the services

Let's first build the services before building the image storage server and monolithic core.

We will build the database service first, as it only depends on the MongoDB server, which is already running. The upload service and monolithic core depend on it, therefore it needs to be built before these.

Database service

The database service will provide actions to add coupons, list verified coupons, list unverified coupons, verify a coupon, and delete a coupon. These actions will be used by the upload service and monolithic core.

Open the Initial/database-service directory. Inside the directory, you will find a package.json file and an app.js file. The app.js file is where you will write the code, and package.json lists the dependencies for the database service. The database service is dependent on the seneca and seneca-mongo-store plugins. Run the npm install command inside Initial/database-service to install the dependencies locally.

Here is the code to import the seneca...

Creating the image upload server

We have finished building the services. Now let's build the image storage server. The image storage server defines the routes using which an image can be stored, deleted, or retrieved.

Open the Initial/image-storage directory. Inside the directory, you will find a package.json file and an app.js file. The app.js file is where you will write the code, and package.json lists the dependencies for the image storage server. The upload service is dependent on express, connect-multiparty, path, and fs. Run the npm install command inside Initial/image-storage to install the dependencies locally.

The following is the code to import the modules:

var express = require("express");
var app = express();
var fs = require("fs");
var multipart = require("connect-multiparty")();

Now let's define the route using which the upload service can store images in the image storage server. The upload service makes the POST request to the /store...

Getting started

The coupon site that we will build will allow users to submit coupons. For the coupon to be publicly visible, the administrator of the site should accept the coupon. Every coupon will have an image attached to it that will be stored and served by an image storage server.

We will be using MongoDB to store the coupons. Before you continue further, make sure that you have MongoDB installed and running. I am assuming that you have basic knowledge of MongoDB.

The exercise files contain two directories: Initial and Final. Inside the Final directory, you will find the complete coupon site source code. In the Initial directory, you will find the HTML code and directories for the monolithic core, services, image storage server, and so on. You will put code related to them in their respective directories. The Initial directory will help you quickly get started with building the coupon site.

We won't get into designing the frontend of our coupon site. We will only be concentrating on building...

Architecture of our site

Our server-side application will be composed of a monolithic core, three services, MongoDB server, and image storage server.

The monolithic core will serve pages to the site visitors and administrators.

The three services are database service, URL configuration service, and upload service. The following is what each of these services do:

  • Database service: Adding, retrieving, updating, and deleting coupons in MongoDB is done through database service. The monolithic core retrieves coupons from MongoDB through database service, and upload service stores coupons through database service.

  • Upload service: When a user submits a coupon, the HTML form is submitted to the upload service. The upload service then sends the image to the image storage server and adds metadata about the coupon to the database using the database service. We moved these operations to a different service, because if we are resizing and converting the uploaded image, then it will consume more memory...

Creating the services

Let's first build the services before building the image storage server and monolithic core.

We will build the database service first, as it only depends on the MongoDB server, which is already running. The upload service and monolithic core depend on it, therefore it needs to be built before these.

Database service

The database service will provide actions to add coupons, list verified coupons, list unverified coupons, verify a coupon, and delete a coupon. These actions will be used by the upload service and monolithic core.

Open the Initial/database-service directory. Inside the directory, you will find a package.json file and an app.js file. The app.js file is where you will write the code, and package.json lists the dependencies for the database service. The database service is dependent on the seneca and seneca-mongo-store plugins. Run the npm install command inside Initial/database-service to install the dependencies locally.

Here is the code to import the seneca module...

Creating the image upload server

We have finished building the services. Now let's build the image storage server. The image storage server defines the routes using which an image can be stored, deleted, or retrieved.

Open the Initial/image-storage directory. Inside the directory, you will find a package.json file and an app.js file. The app.js file is where you will write the code, and package.json lists the dependencies for the image storage server. The upload service is dependent on express, connect-multiparty, path, and fs. Run the npm install command inside Initial/image-storage to install the dependencies locally.

The following is the code to import the modules:

var express = require("express");
var app = express();
var fs = require("fs");
var multipart = require("connect-multiparty")();

Now let's define the route using which the upload service can store images in the image storage server. The upload service makes the POST request to the /store URL path to store the image. Here is the...

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Key benefits

  • Explore the new features of ECMAScript 6 and how they can be incorporated to build cutting edge web applications
  • Learn about modern web architectures and build real-world apps on top of them
  • Make use of modern JavaScript tools, techniques and frameworks to enhance your web development skills

Description

Over the years, JavaScript has become vital to the development of a wide range of applications with different architectures. But JS moves lightning fast, and it’s easy to fall behind. Modern JavaScript Applications is designed to get you exploring the latest features of JavaScript and how they can be applied to develop high-quality applications with different architectures. Begin by creating a single page application that builds on the innovative MVC approach using AngularJS, then move forward to develop an enterprise-level application with the microservices architecture using Node to build web services. After that, shift your focus to network programming concepts as you build a real-time web application with websockets. Learn to build responsive, declarative UIs with React and Bootstrap, and see how the performance of web applications can be enhanced using Functional Reactive Programming (FRP). Along the way, explore how the power of JavaScript can be increased multi-fold with high performance techniques. By the end of the book, you’ll be a skilled JavaScript developer with a solid knowledge of the latest JavaScript techniques, tools, and architecture to build modern web apps.

Who is this book for?

This book is for existing JavaScript developers who want to explore some of the modern JavaScript features, techniques, and architectures to develop cutting edge web applications.

What you will learn

  • Learn to create single page websites
  • Gain expertise in responsive and dynamic website design
  • Enable Real-time communications between client-client and client-server/server-client
  • Create APIs for large-scale applications
  • Write complete applications using functional reactive programming

Product Details

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Publication date : Jul 25, 2016
Length: 330 pages
Edition : 1st
Language : English
ISBN-13 : 9781785880278
Category :
Web Development
Languages :
JavaScript
Concepts :
Web Programming
Tools :
Node.js

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Product Details

Publication date : Jul 25, 2016
Length: 330 pages
Edition : 1st
Language : English
ISBN-13 : 9781785880278
Category :
Web Development
Languages :
JavaScript
Concepts :
Web Programming
Tools :
Node.js

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Table of Contents

15 Chapters
1. Breaking into Microservices Architecture Chevron down icon Chevron up icon
1. Breaking into Microservices Architecture
What is monolithic architecture?
Microservices architecture to the rescue
Implementing microservices using Seneca
Summary
2. Building a Coupon Site Chevron down icon Chevron up icon
2. Building a Coupon Site
Getting started
Architecture of our site
Creating the services
Creating the image upload server
Creating the monolithic core
Website walkthrough
Further improvements to the site
Summary
3. Communication between Browsers in Real Time Chevron down icon Chevron up icon
3. Communication between Browsers in Real Time
Terminologies
Introduction to WebRTC
WebRTC applications using PeerJS
Miscellaneous
Summary
4. Building a Chatroulette Chevron down icon Chevron up icon
4. Building a Chatroulette
Creating your own PeerServer
Creating a chatroulette
Summary
5. Bidirectional Communication in Real Time Chevron down icon Chevron up icon
5. Bidirectional Communication in Real Time
Introducing WebSocket
Introduction to Socket.IO
Summary
6. Building a Live Score Site Chevron down icon Chevron up icon
6. Building a Live Score Site
Building the backend
Building the frontend
Testing the website
Summary
7. Functional Reactive Programming Chevron down icon Chevron up icon
7. Functional Reactive Programming
Introduction to reactive programming
Functional programming in a nutshell
Getting started with FRP
FRP using Bacon.js
Summary
8. Building an Advanced Profile Search Widget Chevron down icon Chevron up icon
8. Building an Advanced Profile Search Widget
Errors in Bacon.js
Handling exceptions
Constant properties
An overview of buses
Subscribing to the end of EventStreams and properties
Unplugging subscribers
Combining and zipping
Lazy evaluation
Building the profile search widget
Summary
9. New Features of Bootstrap 4 Chevron down icon Chevron up icon
9. New Features of Bootstrap 4
Downloading Bootstrap 4
Browser and device support
Understanding the rem and em CSS units
The grid system
Global margin reset
Spacing utility classes
Display headings
Inverse tables
The card component
Outline buttons
Moving from Less to Sass
Text alignment and float utility classes
Reboot
Flexbox support
JavaScript improvements
Adding Tether
The 21:9 aspect ratio class
Customizing Bootstrap 4
Glyphicons dropped
Summary
10. Building User Interfaces Using React Chevron down icon Chevron up icon
10. Building User Interfaces Using React
Introducing React
Getting started with JSX
Digging into components
Reconciliation
Default component property values
Component life cycle methods
Mixins
Using Refs
ReactDOMServer.renderToStaticMarkup
Summary
11. Building an RSS Reader Using React and Flux Chevron down icon Chevron up icon
11. Building an RSS Reader Using React and Flux
Understanding Flux
Using Flux.js
Using MicroEvent.js
Introduction to React Router
Creating the RSS feed reader
Summary
12. New Features of Angular 2 Chevron down icon Chevron up icon
12. New Features of Angular 2
The Angular 2 architecture
Introducing web components
Setting up an Angular 2 project
Angular 2 fundamentals
Styling components and shadow DOM
Angular 2 change detection
Understanding view children and content children
Component lifecycle methods
Writing templates
Outputs
Understanding providers
The difference between providers and the viewProviders property
Summary
13. Building a Search Engine Template Using AngularJS 2 Chevron down icon Chevron up icon
13. Building a Search Engine Template Using AngularJS 2
Setting up the project
Configuring routes and bootstrapping the app
Generating random search results
Creating route components
Testing the template
Routing life cycle methods
Production mode versus development mode
Summary
14. Securing and Scaling Node.js Applications Chevron down icon Chevron up icon
14. Securing and Scaling Node.js Applications
Common vulnerabilities in applications
Non-vulnerability based attacks
Using secure packages
Scaling Node.js servers
Summary
Index Chevron down icon Chevron up icon
Index

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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Full star icon 5
(1 Ratings)
5 star 100%
4 star 0%
3 star 0%
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1 star 0%
Olivier Pons Aug 05, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
It's just state-of-the-art technology.You'll learn what :- microservices are... and how they are used in a real life application (a coupon site),- WebRTC and PeerJS are... and how they are used in a real life application (chat-roulette like),- Functional Reactive Programming is (even though I hate this, I know what it is now and how it works),- ReactJS is and how to use it with Flux in a real life application (RSS reader),...And above all: you'll learn about all the new features of Boostrap 4 and the basics and principles of Angular 2.Well all in all here's how I see the book: either I spend 2 days learning on the Web, trying and trying everything, and this has a big cost, or I buy a book like this and stay up to date with new technologies. My choice is made and I dont regret it.Only one thing to keep in mind: it's not for beginners.
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About the author

Profile icon Narayan Prusty
Narayan Prusty
Narayan Prusty is a full-stack developer. He works as a consultant for various start-ups around the world. He has worked on various technologies and programming languages but is very passionate about JavaScript, WordPress, Ethereum, Solr, React, Cordova, MongoDB, and AWS. Apart from consulting for various start-ups, he also runs a blog titled QNimate and a video tutorial site titled QScutter, where he shares information about a lot of the technologies he works on.
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Our eBooks are currently available in a variety of formats such as PDF and ePubs. In the future, this may well change with trends and development in technology, but please note that our PDFs are not Adobe eBook Reader format, which has greater restrictions on security.

You will need to use Adobe Reader v9 or later in order to read Packt's PDF eBooks.

What are the benefits of eBooks? Chevron down icon Chevron up icon
  • You can get the information you need immediately
  • You can easily take them with you on a laptop
  • You can download them an unlimited number of times
  • You can print them out
  • They are copy-paste enabled
  • They are searchable
  • There is no password protection
  • They are lower price than print
  • They save resources and space
What is an eBook? Chevron down icon Chevron up icon

Packt eBooks are a complete electronic version of the print edition, available in PDF and ePub formats. Every piece of content down to the page numbering is the same. Because we save the costs of printing and shipping the book to you, we are able to offer eBooks at a lower cost than print editions.

When you have purchased an eBook, simply login to your account and click on the link in Your Download Area. We recommend you saving the file to your hard drive before opening it.

For optimal viewing of our eBooks, we recommend you download and install the free Adobe Reader version 9.