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‎.babelrc

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{
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"presets": ["react", "es2015", "stage-2"]
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}

‎.eslintrc

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{
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"parser": "babel-eslint",
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"extends": "airbnb",
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"rules": {
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"react/prefer-stateless-function": 0,
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"react/jsx-filename-extension": [1, { "extensions": [".js", ".jsx"] }],
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"no-useless-constructor": 0,
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"comma-dangle": ["error", "never"],
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"class-methods-use-this": 0,
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"react/forbid-prop-types": 0
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},
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"env": {
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"browser": true,
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"mocha": true
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}
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}

‎.gitignore

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# Logs
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logs
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*.log
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npm-debug.log*
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# Runtime data
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pids
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*.pid
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*.seed
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# Directory for instrumented libs generated by jscoverage/JSCover
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lib-cov
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# Coverage directory used by tools like istanbul
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coverage
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# nyc test coverage
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.nyc_output
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# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
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.grunt
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# node-waf configuration
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.lock-wscript
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# Compiled binary addons (http://nodejs.org/api/addons.html)
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build/Release
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# Dependency directories
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node_modules
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jspm_packages
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# Optional npm cache directory
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.npm
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# Optional REPL history
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.node_repl_history
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# Build
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dist

‎LICENSE

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MIT License
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Copyright (c) 2016 Tushar Arora
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎README.md

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# react-flux-chat (whatsapp-web-demo)
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## Installation
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```
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npm install
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```
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## Launch
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```
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npm start
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```
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Visit [http://localhost:8080](http://localhost:8080)
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## Test
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```
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npm test
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```
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## Technologies Used
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* [ReactJS](https://facebook.github.io/react/) ([Flux](https://facebook.github.io/flux/))
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* [Bootstrap](http://getbootstrap.com/)
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* [Webpack](https://webpack.github.io/) (Module bundler)
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* [Eslint](http://eslint.org/) (Linting ES6 and ReactJS)
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* [Babel](https://babeljs.io/) (ES6 transpilation)
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* [Mocha](https://mochajs.org/) (Test runner)
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* [Enzyme](http://airbnb.io/enzyme/) (Test utility for ReactJS)
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* [Chai](http://chaijs.com/) (Assertions)
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* [Sinon](http://sinonjs.org/) (Test Spy)
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* Websockets
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* [DexieJS](http://dexie.org/) (IndexedDB wrapper library)
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## Thought Process
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1. I started with setting up a basic build system for **React** and **ES6** using **babel** and **webpack**. It involved basic housekeeping and moving some files from src to dist.
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2. Then I focused on getting a single component on the screen to look and feel like a chat application with two column layout.
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3. Looked for some lightweight css library or framework. After looking at multiple options like Skeleton and Cardinal, I settled for **Bootstrap** (Even though it has a lot of components which I did not want but it's possible to compile whichever less or sass components we need for the project) for its simplicity and my previous experience using it.
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4. Started writing css for the component. At first I took css classnames as whatever looked appropriate at that time, then renamed them afterwards according to the layout and semantics.
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5. Made sure that layouts worked on mobile and tablet devices and wrote media queries for that. (Only 2-3 media queries were required to be manually written, rest were handled by bootstrap).
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6. Then I thought about breaking that single component into pieces. Now, there is one main component 'App'. It has two child components as 'ThreadPanel' as the left column and 'ChatPanel' as the right column. These two components have their own child components as well.
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7. Wrote APIUtils as POJO Singletons so that instance need not be created before use.
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8. Then I reasoned about Flux architecture and how to integrate it to the application to ensure unidirectional data flow.
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9. Meanwhile I setup the test environment using **Mocha**. Used **chai** for assertions, **sinon** for spying on functions and **jsdom** for mocking browser like enviromnment. Among testing utilities I compared between Jest and Enzyme and found Enzyme's API more expressive and simpler to use.
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10. Started writing components and their respective tests. Had to refactor and rewrite code multiple times to create components with featurs like single responsiblity and easy to test.
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11. Worked on setting up unidirectional data flow using **Flux**. Setup **Dispatcher**, **Action Creators**, **Stores** and made sure that components are receiving the appropriate data and dispatched events.
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12. Started looking for client side storage solutions. I was familiar with cookies/localStorage/sessionStorage but wanted to try out some something more structured. IndexedDB was my first choice (supports indexes) but it would have taken some time to setup low level stuff, so I used **DexieJS** which is a wrapper library for cross browser IndexedDB implementation.
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13. Wrote **WebSockets** and **Dexie** utils (POJO Singletons) for getting echoed response and saving data to IndexedDB respectively. Created basic schema for message object.
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14. Improved upon build process by moving frontend resources to be installed as node_modules and made sure that css, html and other resources bundling was automated.
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## Structure
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![React-Flux-Demo-Structure](https://github.com/tushararora/react-flux-chat/blob/master/structure.png "react-flux-chat structure")
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## Parameters for choice of technologies
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1. Does it follow the current direction of web? (Web Components, Web Views)
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2. Does it have good documentation and community support?
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3. Is it actively maintained?
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4. Does it have simple and expressive API?
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5. Is it ready to use?
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## Notes
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1. Tested on latest versions of Firefox and Chrome on Ubuntu 14.04
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2. Used Node.js v6.7.0 and npm v3.10.3

‎package.json

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{
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"name": "react-flux-chat",
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"version": "1.0.0",
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"description": "React-Flux-Chat example inspired by whatsapp web",
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"main": "index.js",
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"scripts": {
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"start": "npm run build",
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"build": "webpack -d && webpack-dev-server --hot --inline --progress --colors --watch --display-error-details --display-cached --content-base dist/ ",
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"test": "mocha test/.setup.js ./test/ --recursive --reporter progress"
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},
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"keywords": [
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"reactjs",
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"flux",
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"chat",
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"webpack",
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"mocha",
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"chai",
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"sinon",
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"babel"
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],
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"author": "Tushar Arora",
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"license": "MIT",
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"dependencies": {
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"bootstrap": "^3.3.7",
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"chai": "^3.5.0",
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"classnames": "^2.2.5",
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"dexie": "^1.4.2",
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"dirty-chai": "^1.2.2",
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"enzyme": "^2.4.1",
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"eslint-plugin-chai-expect": "^1.1.1",
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"eslint-plugin-import": "^2.0.0",
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"extract-text-webpack-plugin": "^1.0.1",
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"fbemitter": "^2.1.1",
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"flux": "^3.0.0",
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"font-awesome": "^4.6.3",
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"html-webpack-plugin": "^2.22.0",
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"keymirror": "^0.1.1",
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"object-assign": "^4.1.0",
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"react": "^15.3.2",
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"react-dom": "^15.3.2",
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"react-timeago": "^3.1.3",
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"sinon": "^1.17.6",
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"webpack": "^1.13.2"
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},
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"devDependencies": {
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"babel-eslint": "^7.0.0",
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"babel-loader": "^6.2.5",
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"babel-preset-es2015": "^6.16.0",
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"babel-preset-react": "^6.16.0",
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"babel-preset-stage-2": "^6.16.0",
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"babel-register": "^6.16.3",
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"css-loader": "^0.25.0",
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"eslint": "^3.7.0",
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"eslint-config-airbnb": "^12.0.0",
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"eslint-loader": "^1.5.0",
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"eslint-plugin-import": "^1.16.0",
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"eslint-plugin-jsx-a11y": "^2.2.2",
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"eslint-plugin-react": "^6.3.0",
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"file-loader": "^0.9.0",
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"html-webpack-plugin": "^2.22.0",
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"jsdom": "^9.5.0",
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"mocha": "^3.1.0",
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"react-addons-test-utils": "^15.3.2",
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"style-loader": "^0.13.1",
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"url-loader": "^0.5.7",
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"webpack-dev-server": "^1.16.1"
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}
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}

‎src/app/App.js

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import React, { Component } from 'react';
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import ReactDOM from 'react-dom';
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import ThreadPanel from './components/ThreadPanel';
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import ChatPanel from './components/ChatPanel';
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import APIUtils from './utils/APIUtils';
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import WebSocketUtils from './utils/WebSocketUtils';
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import DBUtils from './utils/DBUtils';
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/* Require css resources to be bundled with html */
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require('bootstrap/dist/css/bootstrap.min.css');
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require('font-awesome/css/font-awesome.min.css');
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require('../assets/css/style.css');
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/* Hardcoded current user passed on to child components */
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const currentUser = {
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name: 'FooBar'
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};
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/**
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* Class representing entry point
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* @extends Component
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*/
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class App extends Component {
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render() {
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return (
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<div className="container">
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<div className="row">
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<ThreadPanel />
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<ChatPanel currentUser={currentUser} />
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</div>
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</div>
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);
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}
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}
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/* Initialize utils */
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APIUtils.fetchAllThreads();
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WebSocketUtils.init();
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DBUtils.init();
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/* Render App component to root */
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ReactDOM.render(<App />, document.getElementById('root'));
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export default App;

‎src/app/actions/MessageActionCreators.js

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import AppDispatcher from '../dispatcher/AppDispatcher';
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import AppConstants from '../constants/AppConstants';
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import APIUtils from '../utils/APIUtils';
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import MessageUtils from '../utils/MessageUtils';
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const ACTION_TYPES = AppConstants.ACTION_TYPES;
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/* MessageActionCreators for message actions */
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const MessageActionCreators = {
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/**
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* Create message and dispatch to MessageStore
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* @param {string} text
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* @param {number} currentThreadId
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* @param {string} author
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*/
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createMessage(text, currentThreadId, author) {
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AppDispatcher.dispatch({
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type: ACTION_TYPES.CREATE_MESSAGE,
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text,
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currentThreadId,
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author
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});
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const message = MessageUtils.getCreatedMessageData(text, currentThreadId, author);
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APIUtils.createMessage(message);
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},
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/**
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* Receive messages and dispatch to MessageStore
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* @param {array} messages
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*/
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receiveAllMessages(messages) {
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AppDispatcher.dispatch({
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type: ACTION_TYPES.RECEIVE_MESSAGES,
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messages
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});
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},
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/**
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* Receive message and dispatch to MessageStore
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* @param {string} text
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*/
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receiveMessage(text) {
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AppDispatcher.dispatch({
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type: ACTION_TYPES.RECEIVE_MESSAGE,
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text
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});
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}
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};
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export default MessageActionCreators;

‎src/app/actions/ThreadActionCreators.js

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import AppDispatcher from '../dispatcher/AppDispatcher';
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import AppConstants from '../constants/AppConstants';
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import APIUtils from '../utils/APIUtils';
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const ACTION_TYPES = AppConstants.ACTION_TYPES;
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/* ThreadActionCreators for thread actions */
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const ThreadActionCreators = {
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/**
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* Click thread and dispatch to ThreadStore
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* @param {number} threadId
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*/
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clickThread(threadId) {
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AppDispatcher.dispatch({
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type: ACTION_TYPES.CLICK_THREAD,
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threadId
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});
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APIUtils.fetchAllMessages(threadId);
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},
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/**
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* Recieve threads and dispatch to ThreadStore
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* @param {array} threads
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*/
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receiveAllThreads(threads) {
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AppDispatcher.dispatch({
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type: ACTION_TYPES.RECEIVE_ALL_THREADS,
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threads
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});
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}
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};
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export default ThreadActionCreators;

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