├── backend
    ├── requirements.txt
    ├── Dockerfile
    └── app.py
├── frontend
    ├── public
    │   ├── robots.txt
    │   ├── favicon.ico
    │   ├── logo192.png
    │   ├── logo512.png
    │   ├── manifest.json
    │   └── index.html
    ├── src
    │   ├── setupTests.js
    │   ├── App.test.js
    │   ├── index.css
    │   ├── index.js
    │   ├── App.js
    │   ├── App.css
    │   ├── logo.svg
    │   └── serviceWorker.js
    ├── .gitignore
    ├── Dockerfile
    ├── nginx.conf
    ├── Dockerfile-prod
    ├── package.json
    └── README.md
├── README.md
├── LICENSE
├── docker-compose-prod.yml
└── docker-compose.yml


/backend/requirements.txt:
--------------------------------------------------------------------------------
1 | flask==1.1.1
2 | gunicorn==20.0.4
3 | flask-mongoengine


--------------------------------------------------------------------------------
/frontend/public/robots.txt:
--------------------------------------------------------------------------------
1 | # https://www.robotstxt.org/robotstxt.html
2 | User-agent: *
3 | Disallow:
4 | 


--------------------------------------------------------------------------------
/frontend/public/favicon.ico:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/emiljohanssonrise/docker-flaskreactmongodb/HEAD/frontend/public/favicon.ico


--------------------------------------------------------------------------------
/frontend/public/logo192.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/emiljohanssonrise/docker-flaskreactmongodb/HEAD/frontend/public/logo192.png


--------------------------------------------------------------------------------
/frontend/public/logo512.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/emiljohanssonrise/docker-flaskreactmongodb/HEAD/frontend/public/logo512.png


--------------------------------------------------------------------------------
/frontend/src/setupTests.js:
--------------------------------------------------------------------------------
1 | // jest-dom adds custom jest matchers for asserting on DOM nodes.
2 | // allows you to do things like:
3 | // expect(element).toHaveTextContent(/react/i)
4 | // learn more: https://github.com/testing-library/jest-dom
5 | import '@testing-library/jest-dom/extend-expect';
6 | 


--------------------------------------------------------------------------------
/frontend/src/App.test.js:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import { render } from '@testing-library/react';
 3 | import App from './App';
 4 | 
 5 | test('renders learn react link', () => {
 6 |   const { getByText } = render(<App />);
 7 |   const linkElement = getByText(/learn react/i);
 8 |   expect(linkElement).toBeInTheDocument();
 9 | });
10 | 


--------------------------------------------------------------------------------
/frontend/.gitignore:
--------------------------------------------------------------------------------
 1 | # See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
 2 | 
 3 | # dependencies
 4 | /node_modules
 5 | /.pnp
 6 | .pnp.js
 7 | 
 8 | # testing
 9 | /coverage
10 | 
11 | # production
12 | /build
13 | 
14 | # misc
15 | .DS_Store
16 | .env.local
17 | .env.development.local
18 | .env.test.local
19 | .env.production.local
20 | 
21 | npm-debug.log*
22 | yarn-debug.log*
23 | yarn-error.log*
24 | 


--------------------------------------------------------------------------------
/frontend/src/index.css:
--------------------------------------------------------------------------------
 1 | body {
 2 |   margin: 0;
 3 |   font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
 4 |     'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
 5 |     sans-serif;
 6 |   -webkit-font-smoothing: antialiased;
 7 |   -moz-osx-font-smoothing: grayscale;
 8 | }
 9 | 
10 | code {
11 |   font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
12 |     monospace;
13 | }
14 | 


--------------------------------------------------------------------------------
/backend/Dockerfile:
--------------------------------------------------------------------------------
 1 | # For more information, please refer to https://aka.ms/vscode-docker-python
 2 | FROM python:3.8
 3 | 
 4 | EXPOSE 5000
 5 | 
 6 | # Keeps Python from generating .pyc files in the container
 7 | ENV PYTHONDONTWRITEBYTECODE 1
 8 | 
 9 | # Turns off buffering for easier container logging
10 | ENV PYTHONUNBUFFERED 1
11 | 
12 | # Install pip requirements
13 | ADD requirements.txt .
14 | RUN python -m pip install -r requirements.txt
15 | 
16 | WORKDIR /app
17 | ADD . /app


--------------------------------------------------------------------------------
/frontend/src/index.js:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import ReactDOM from 'react-dom';
 3 | import './index.css';
 4 | import App from './App';
 5 | import * as serviceWorker from './serviceWorker';
 6 | 
 7 | ReactDOM.render(
 8 |   <React.StrictMode>
 9 |     <App />
10 |   </React.StrictMode>,
11 |   document.getElementById('root')
12 | );
13 | 
14 | // If you want your app to work offline and load faster, you can change
15 | // unregister() to register() below. Note this comes with some pitfalls.
16 | // Learn more about service workers: https://bit.ly/CRA-PWA
17 | serviceWorker.unregister();
18 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # Set up a React app with a Flask and MongoDB backend using Docker
2 | 
3 | This repository contains example code showing how to to set up and containerize a full stack web application with a React frontend, a Flask RESTful API and a MongoDB database using Docker. It includes one docker-compose file to set up a development environment and a docker-compose-prod file to set up a production environment.
4 | 
5 | Further instructions on how to run the example code can be found in this Medium article: https://medium.com/@lotrproject/how-to-set-up-a-react-app-with-a-flask-and-mongodb-backend-using-docker-19b356180199
6 | 


--------------------------------------------------------------------------------
/frontend/Dockerfile:
--------------------------------------------------------------------------------
 1 | # Pull latest official node image
 2 | FROM node:latest
 3 | 
 4 | # Expose ports
 5 | EXPOSE 3000
 6 | EXPOSE 35729
 7 | 
 8 | # Set working directory
 9 | WORKDIR /app
10 | 
11 | # add `/app/node_modules/.bin` to environment variables
12 | ENV PATH /app/node_modules/.bin:$PATH
13 | 
14 | # Copy package files and install app dependencies
15 | COPY package.json /app/package.json
16 | COPY package-lock.json /app/package-lock.json
17 | RUN npm install
18 | RUN npm install react-scripts -g
19 | 
20 | # Add React app to working directory
21 | ADD . /app
22 | 
23 | # Start the React app
24 | CMD ["npm", "start"]


--------------------------------------------------------------------------------
/frontend/public/manifest.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "short_name": "React App",
 3 |   "name": "Create React App Sample",
 4 |   "icons": [
 5 |     {
 6 |       "src": "favicon.ico",
 7 |       "sizes": "64x64 32x32 24x24 16x16",
 8 |       "type": "image/x-icon"
 9 |     },
10 |     {
11 |       "src": "logo192.png",
12 |       "type": "image/png",
13 |       "sizes": "192x192"
14 |     },
15 |     {
16 |       "src": "logo512.png",
17 |       "type": "image/png",
18 |       "sizes": "512x512"
19 |     }
20 |   ],
21 |   "start_url": ".",
22 |   "display": "standalone",
23 |   "theme_color": "#000000",
24 |   "background_color": "#ffffff"
25 | }
26 | 


--------------------------------------------------------------------------------
/frontend/nginx.conf:
--------------------------------------------------------------------------------
 1 | upstream webapp_api {
 2 |     server api:5000;
 3 | }
 4 | 
 5 | server {
 6 |     listen 80;
 7 |     
 8 |     location /api {
 9 |         proxy_pass http://webapp_api;
10 |         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
11 |         proxy_set_header Host $host;
12 |         proxy_redirect off;
13 |     }
14 |     
15 |     location / {
16 |         root   /usr/share/nginx/html;
17 |         index  index.html index.htm;
18 |         try_files $uri $uri/ /index.html;
19 |     }
20 |     error_page   500 502 503 504  /50x.html;
21 |     location = /50x.html {
22 |         root   /usr/share/nginx/html;
23 |     }
24 | }


--------------------------------------------------------------------------------
/frontend/src/App.js:
--------------------------------------------------------------------------------
 1 | import React from 'react';
 2 | import logo from './logo.svg';
 3 | import './App.css';
 4 | 
 5 | function App() {
 6 |   return (
 7 |     <div className="App">
 8 |       <header className="App-header">
 9 |         <img src={logo} className="App-logo" alt="logo" />
10 |         <p>
11 |           Edit <code>src/App.js</code> and save to reload. bla
12 |         </p>
13 |         <a
14 |           className="App-link"
15 |           href="https://reactjs.org"
16 |           target="_blank"
17 |           rel="noopener noreferrer"
18 |         >
19 |           Learn React
20 |         </a>
21 |       </header>
22 |     </div>
23 |   );
24 | }
25 | 
26 | export default App;
27 | 


--------------------------------------------------------------------------------
/frontend/src/App.css:
--------------------------------------------------------------------------------
 1 | .App {
 2 |   text-align: center;
 3 | }
 4 | 
 5 | .App-logo {
 6 |   height: 40vmin;
 7 |   pointer-events: none;
 8 | }
 9 | 
10 | @media (prefers-reduced-motion: no-preference) {
11 |   .App-logo {
12 |     animation: App-logo-spin infinite 20s linear;
13 |   }
14 | }
15 | 
16 | .App-header {
17 |   background-color: #282c34;
18 |   min-height: 100vh;
19 |   display: flex;
20 |   flex-direction: column;
21 |   align-items: center;
22 |   justify-content: center;
23 |   font-size: calc(10px + 2vmin);
24 |   color: white;
25 | }
26 | 
27 | .App-link {
28 |   color: #61dafb;
29 | }
30 | 
31 | @keyframes App-logo-spin {
32 |   from {
33 |     transform: rotate(0deg);
34 |   }
35 |   to {
36 |     transform: rotate(360deg);
37 |   }
38 | }
39 | 


--------------------------------------------------------------------------------
/frontend/Dockerfile-prod:
--------------------------------------------------------------------------------
 1 | # base image
 2 | FROM node:12.2.0-alpine as build
 3 | 
 4 | # set working directory
 5 | WORKDIR /app
 6 | 
 7 | # add `/app/node_modules/.bin` to $PATH
 8 | ENV PATH /app/node_modules/.bin:$PATH
 9 | 
10 | # install and cache app dependencies
11 | COPY package.json /app/package.json
12 | COPY package-lock.json /app/package-lock.json
13 | RUN npm install
14 | RUN npm install react-scripts -g
15 | 
16 | ADD . /app
17 | 
18 | # start app
19 | RUN npm run build
20 | 
21 | # Stage 1, based on Nginx, to have only the compiled app, ready for production with Nginx
22 | FROM nginx:1.17-alpine
23 | 
24 | COPY --from=build /app/build /usr/share/nginx/html
25 | 
26 | RUN rm /etc/nginx/conf.d/default.conf
27 | COPY nginx.conf /etc/nginx/conf.d
28 | 
29 | EXPOSE 80
30 | 
31 | CMD ["nginx", "-g", "daemon off;"]


--------------------------------------------------------------------------------
/frontend/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "frontend",
 3 |   "version": "0.1.0",
 4 |   "private": true,
 5 |   "dependencies": {
 6 |     "@testing-library/jest-dom": "^4.2.4",
 7 |     "@testing-library/react": "^9.5.0",
 8 |     "@testing-library/user-event": "^7.2.1",
 9 |     "react": "^16.13.1",
10 |     "react-dom": "^16.13.1",
11 |     "react-scripts": "3.4.1"
12 |   },
13 |   "scripts": {
14 |     "start": "react-scripts start",
15 |     "build": "react-scripts build",
16 |     "test": "react-scripts test",
17 |     "eject": "react-scripts eject"
18 |   },
19 |   "eslintConfig": {
20 |     "extends": "react-app"
21 |   },
22 |   "browserslist": {
23 |     "production": [
24 |       ">0.2%",
25 |       "not dead",
26 |       "not op_mini all"
27 |     ],
28 |     "development": [
29 |       "last 1 chrome version",
30 |       "last 1 firefox version",
31 |       "last 1 safari version"
32 |     ]
33 |   }
34 | }
35 | 


--------------------------------------------------------------------------------
/backend/app.py:
--------------------------------------------------------------------------------
 1 | import datetime
 2 | import os
 3 |  
 4 | from flask import Flask, Response, request
 5 | from flask_mongoengine import MongoEngine
 6 | 
 7 | app = Flask(__name__)
 8 | app.config['MONGODB_SETTINGS'] = {
 9 |     'host': os.environ['MONGODB_HOST'],
10 |     'username': os.environ['MONGODB_USERNAME'],
11 |     'password': os.environ['MONGODB_PASSWORD'],
12 |     'db': 'webapp'
13 | }
14 | 
15 | db = MongoEngine()
16 | db.init_app(app)
17 | 
18 | class Todo(db.Document):
19 |     title = db.StringField(max_length=60)
20 |     text = db.StringField()
21 |     done = db.BooleanField(default=False)
22 |     pub_date = db.DateTimeField(default=datetime.datetime.now)
23 | 
24 | @app.route("/api")
25 | def index():
26 |     Todo.objects().delete()
27 |     Todo(title="Simple todo A", text="12345678910").save()
28 |     Todo(title="Simple todo B", text="12345678910").save()
29 |     Todo.objects(title__contains="B").update(set__text="Hello world")
30 |     todos = Todo.objects().to_json()
31 |     return Response(todos, mimetype="application/json", status=200)
32 | 
33 | if __name__ == "__main__":
34 |     app.run(debug=True, port=5000)


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | MIT License
 2 | 
 3 | Copyright (c) 2020 Emil Johansson
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


--------------------------------------------------------------------------------
/docker-compose-prod.yml:
--------------------------------------------------------------------------------
 1 | version: '3.7'
 2 | 
 3 | services:
 4 | 
 5 |     client:
 6 |         build:
 7 |             context: ./frontend
 8 |             dockerfile: Dockerfile-prod
 9 |         ports:
10 |             - "3000:80"
11 |         volumes: 
12 |             - ./frontend:/app
13 |             - /app/node_modules
14 |         networks:
15 |             - frontend
16 | 
17 |     mongodb:
18 |         image: mongo
19 |         container_name: mongo
20 |         restart: unless-stopped
21 |         command: mongod --auth
22 |         environment:
23 |             MONGO_INITDB_ROOT_USERNAME: "admin"
24 |             MONGO_INITDB_ROOT_PASSWORD: "password"
25 |             MONGO_INITDB_DATABASE: webapp
26 |             MONGODB_DATA_DIR: /data/db
27 |         volumes:
28 |             - mongodbdata:/data/db
29 |         networks:
30 |             - backend
31 | 
32 |     api:
33 |         build: 
34 |             context: ./backend
35 |             dockerfile: Dockerfile
36 |         command: gunicorn --bind 0.0.0.0:5000 app:app
37 |         expose:
38 |             - 5000
39 |         environment:
40 |             MONGODB_HOST: mongodb
41 |             MONGODB_USERNAME: "apiuser"
42 |             MONGODB_PASSWORD: "apipassword"
43 |         volumes:
44 |             - appdata:/var/www/
45 |         depends_on: 
46 |             - mongodb
47 |         networks:
48 |             - frontend
49 |             - backend
50 | 
51 | networks:
52 |     frontend:
53 |         driver: bridge
54 |     backend:
55 |         driver: bridge
56 | volumes:
57 |     mongodbdata:
58 |         driver: local
59 |     appdata:
60 |         driver: local


--------------------------------------------------------------------------------
/docker-compose.yml:
--------------------------------------------------------------------------------
 1 | version: '3.7'
 2 | 
 3 | services:
 4 | 
 5 |     client:
 6 |         build:
 7 |             context: ./frontend
 8 |             dockerfile: Dockerfile
 9 |         tty: true
10 |         ports:
11 |             - "3000:3000"
12 |         volumes: 
13 |             - ./frontend:/app
14 |             - /app/node_modules
15 |         networks:
16 |             - frontend
17 | 
18 |     mongodb:
19 |         image: mongo
20 |         container_name: mongo
21 |         restart: unless-stopped
22 |         command: mongod --auth
23 |         environment:
24 |             MONGO_INITDB_ROOT_USERNAME: "admin"
25 |             MONGO_INITDB_ROOT_PASSWORD: "password"
26 |             MONGO_INITDB_DATABASE: webapp
27 |             MONGODB_DATA_DIR: /data/db
28 |         volumes:
29 |         - mongodbdata:/data/db
30 |         networks:
31 |         - backend
32 | 
33 |     api:
34 |         build: 
35 |             context: ./backend
36 |             dockerfile: Dockerfile
37 |         command: gunicorn --bind 0.0.0.0:5000 app:app
38 |         ports:
39 |             - "5000:5000"
40 |         environment:
41 |             MONGODB_HOST: mongodb
42 |             MONGODB_USERNAME: "apiuser"
43 |             MONGODB_PASSWORD: "apipassword"
44 |         volumes:
45 |             - appdata:/var/www/
46 |         depends_on: 
47 |             - mongodb
48 |         networks:
49 |             - frontend
50 |             - backend
51 | 
52 | networks:
53 |     frontend:
54 |         driver: bridge
55 |     backend:
56 |         driver: bridge
57 | volumes:
58 |     mongodbdata:
59 |         driver: local
60 |     appdata:
61 |         driver: local


--------------------------------------------------------------------------------
/frontend/public/index.html:
--------------------------------------------------------------------------------
 1 | <!DOCTYPE html>
 2 | <html lang="en">
 3 |   <head>
 4 |     <meta charset="utf-8" />
 5 |     <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
 6 |     <meta name="viewport" content="width=device-width, initial-scale=1" />
 7 |     <meta name="theme-color" content="#000000" />
 8 |     <meta
 9 |       name="description"
10 |       content="Web site created using create-react-app"
11 |     />
12 |     <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
13 |     <!--
14 |       manifest.json provides metadata used when your web app is installed on a
15 |       user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
16 |     -->
17 |     <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
18 |     <!--
19 |       Notice the use of %PUBLIC_URL% in the tags above.
20 |       It will be replaced with the URL of the `public` folder during the build.
21 |       Only files inside the `public` folder can be referenced from the HTML.
22 | 
23 |       Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
24 |       work correctly both with client-side routing and a non-root public URL.
25 |       Learn how to configure a non-root public URL by running `npm run build`.
26 |     -->
27 |     <title>React App</title>
28 |   </head>
29 |   <body>
30 |     <noscript>You need to enable JavaScript to run this app.</noscript>
31 |     <div id="root"></div>
32 |     <!--
33 |       This HTML file is a template.
34 |       If you open it directly in the browser, you will see an empty page.
35 | 
36 |       You can add webfonts, meta tags, or analytics to this file.
37 |       The build step will place the bundled scripts into the <body> tag.
38 | 
39 |       To begin the development, run `npm start` or `yarn start`.
40 |       To create a production bundle, use `npm run build` or `yarn build`.
41 |     -->
42 |   </body>
43 | </html>
44 | 


--------------------------------------------------------------------------------
/frontend/src/logo.svg:
--------------------------------------------------------------------------------
1 | <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
2 |     <g fill="#61DAFB">
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7 | </svg>
8 | 


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/frontend/README.md:
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 1 | This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
 2 | 
 3 | ## Available Scripts
 4 | 
 5 | In the project directory, you can run:
 6 | 
 7 | ### `npm start`
 8 | 
 9 | Runs the app in the development mode.<br />
10 | Open [http://localhost:3000](http://localhost:3000) to view it in the browser.
11 | 
12 | The page will reload if you make edits.<br />
13 | You will also see any lint errors in the console.
14 | 
15 | ### `npm test`
16 | 
17 | Launches the test runner in the interactive watch mode.<br />
18 | See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
19 | 
20 | ### `npm run build`
21 | 
22 | Builds the app for production to the `build` folder.<br />
23 | It correctly bundles React in production mode and optimizes the build for the best performance.
24 | 
25 | The build is minified and the filenames include the hashes.<br />
26 | Your app is ready to be deployed!
27 | 
28 | See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
29 | 
30 | ### `npm run eject`
31 | 
32 | **Note: this is a one-way operation. Once you `eject`, you can’t go back!**
33 | 
34 | If you aren’t satisfied with the build tool and configuration choices, you can `eject` at any time. This command will remove the single build dependency from your project.
35 | 
36 | Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except `eject` will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own.
37 | 
38 | You don’t have to ever use `eject`. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
39 | 
40 | ## Learn More
41 | 
42 | You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
43 | 
44 | To learn React, check out the [React documentation](https://reactjs.org/).
45 | 
46 | ### Code Splitting
47 | 
48 | This section has moved here: https://facebook.github.io/create-react-app/docs/code-splitting
49 | 
50 | ### Analyzing the Bundle Size
51 | 
52 | This section has moved here: https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size
53 | 
54 | ### Making a Progressive Web App
55 | 
56 | This section has moved here: https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app
57 | 
58 | ### Advanced Configuration
59 | 
60 | This section has moved here: https://facebook.github.io/create-react-app/docs/advanced-configuration
61 | 
62 | ### Deployment
63 | 
64 | This section has moved here: https://facebook.github.io/create-react-app/docs/deployment
65 | 
66 | ### `npm run build` fails to minify
67 | 
68 | This section has moved here: https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify
69 | 


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/frontend/src/serviceWorker.js:
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  1 | // This optional code is used to register a service worker.
  2 | // register() is not called by default.
  3 | 
  4 | // This lets the app load faster on subsequent visits in production, and gives
  5 | // it offline capabilities. However, it also means that developers (and users)
  6 | // will only see deployed updates on subsequent visits to a page, after all the
  7 | // existing tabs open on the page have been closed, since previously cached
  8 | // resources are updated in the background.
  9 | 
 10 | // To learn more about the benefits of this model and instructions on how to
 11 | // opt-in, read https://bit.ly/CRA-PWA
 12 | 
 13 | const isLocalhost = Boolean(
 14 |   window.location.hostname === 'localhost' ||
 15 |     // [::1] is the IPv6 localhost address.
 16 |     window.location.hostname === '[::1]' ||
 17 |     // 127.0.0.0/8 are considered localhost for IPv4.
 18 |     window.location.hostname.match(
 19 |       /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
 20 |     )
 21 | );
 22 | 
 23 | export function register(config) {
 24 |   if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
 25 |     // The URL constructor is available in all browsers that support SW.
 26 |     const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
 27 |     if (publicUrl.origin !== window.location.origin) {
 28 |       // Our service worker won't work if PUBLIC_URL is on a different origin
 29 |       // from what our page is served on. This might happen if a CDN is used to
 30 |       // serve assets; see https://github.com/facebook/create-react-app/issues/2374
 31 |       return;
 32 |     }
 33 | 
 34 |     window.addEventListener('load', () => {
 35 |       const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
 36 | 
 37 |       if (isLocalhost) {
 38 |         // This is running on localhost. Let's check if a service worker still exists or not.
 39 |         checkValidServiceWorker(swUrl, config);
 40 | 
 41 |         // Add some additional logging to localhost, pointing developers to the
 42 |         // service worker/PWA documentation.
 43 |         navigator.serviceWorker.ready.then(() => {
 44 |           console.log(
 45 |             'This web app is being served cache-first by a service ' +
 46 |               'worker. To learn more, visit https://bit.ly/CRA-PWA'
 47 |           );
 48 |         });
 49 |       } else {
 50 |         // Is not localhost. Just register service worker
 51 |         registerValidSW(swUrl, config);
 52 |       }
 53 |     });
 54 |   }
 55 | }
 56 | 
 57 | function registerValidSW(swUrl, config) {
 58 |   navigator.serviceWorker
 59 |     .register(swUrl)
 60 |     .then(registration => {
 61 |       registration.onupdatefound = () => {
 62 |         const installingWorker = registration.installing;
 63 |         if (installingWorker == null) {
 64 |           return;
 65 |         }
 66 |         installingWorker.onstatechange = () => {
 67 |           if (installingWorker.state === 'installed') {
 68 |             if (navigator.serviceWorker.controller) {
 69 |               // At this point, the updated precached content has been fetched,
 70 |               // but the previous service worker will still serve the older
 71 |               // content until all client tabs are closed.
 72 |               console.log(
 73 |                 'New content is available and will be used when all ' +
 74 |                   'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
 75 |               );
 76 | 
 77 |               // Execute callback
 78 |               if (config && config.onUpdate) {
 79 |                 config.onUpdate(registration);
 80 |               }
 81 |             } else {
 82 |               // At this point, everything has been precached.
 83 |               // It's the perfect time to display a
 84 |               // "Content is cached for offline use." message.
 85 |               console.log('Content is cached for offline use.');
 86 | 
 87 |               // Execute callback
 88 |               if (config && config.onSuccess) {
 89 |                 config.onSuccess(registration);
 90 |               }
 91 |             }
 92 |           }
 93 |         };
 94 |       };
 95 |     })
 96 |     .catch(error => {
 97 |       console.error('Error during service worker registration:', error);
 98 |     });
 99 | }
100 | 
101 | function checkValidServiceWorker(swUrl, config) {
102 |   // Check if the service worker can be found. If it can't reload the page.
103 |   fetch(swUrl, {
104 |     headers: { 'Service-Worker': 'script' },
105 |   })
106 |     .then(response => {
107 |       // Ensure service worker exists, and that we really are getting a JS file.
108 |       const contentType = response.headers.get('content-type');
109 |       if (
110 |         response.status === 404 ||
111 |         (contentType != null && contentType.indexOf('javascript') === -1)
112 |       ) {
113 |         // No service worker found. Probably a different app. Reload the page.
114 |         navigator.serviceWorker.ready.then(registration => {
115 |           registration.unregister().then(() => {
116 |             window.location.reload();
117 |           });
118 |         });
119 |       } else {
120 |         // Service worker found. Proceed as normal.
121 |         registerValidSW(swUrl, config);
122 |       }
123 |     })
124 |     .catch(() => {
125 |       console.log(
126 |         'No internet connection found. App is running in offline mode.'
127 |       );
128 |     });
129 | }
130 | 
131 | export function unregister() {
132 |   if ('serviceWorker' in navigator) {
133 |     navigator.serviceWorker.ready
134 |       .then(registration => {
135 |         registration.unregister();
136 |       })
137 |       .catch(error => {
138 |         console.error(error.message);
139 |       });
140 |   }
141 | }
142 | 


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