Merge pull request #35 from jdrouet/react-rust

create a react-rust-postgres example

README.md

@@ -58,6 +58,8 @@ docker-compose down
   application with a Spring backend and a MySQL database
 - [`React / Express / MySQL`](react-express-mysql) -- sample React
   application with a NodeJS backend and a MySQL database
+- [`React / Rust / PostgreSQL`](react-rust-postgres) -- sample React
+  application with a Rust backend and a Postgres database
 - [`Spring / PostgreSQL`](spring-postgres) -- sample Java application
   with Spring framework and a Postgres database
 

react-rust-postgres/backend/.dockerignore

@@ -0,0 +1,2 @@
+target
+Cargo.lock

react-rust-postgres/backend/.gitignore

@@ -0,0 +1,2 @@
+target
+Cargo.lock

react-rust-postgres/backend/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "react-rust-postgres"
+version = "0.1.0"
+authors = ["Jérémie Drouet <jeremie.drouet@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+diesel_migrations = "1.4.0"
+rocket = "0.4.4"
+serde = "1.0"
+serde_json = "1.0"
+serde_derive = "1.0"
+
+[dependencies.diesel]
+version = "1.0.0"
+features = ["postgres"]
+
+[dependencies.rocket_contrib]
+version = "0.4.4"
+default-features = false
+features = ["json", "diesel_postgres_pool"]

react-rust-postgres/backend/Dockerfile

@@ -0,0 +1,35 @@
+FROM jdrouet/rust-nightly:buster-slim AS base
+
+RUN apt-get update \
+  && apt-get install -y libpq-dev \
+  && rm -rf /var/lib/apt/lists/*
+
+ENV USER=root
+ENV ROCKET_ADDRESS=0.0.0.0
+ENV ROCKET_ENV=development
+
+WORKDIR /code
+RUN cargo init
+COPY Cargo.toml /code/Cargo.toml
+RUN cargo fetch
+COPY . /code
+
+FROM base AS development
+
+EXPOSE 8000
+
+CMD [ "cargo", "run", "--offline" ]
+
+FROM base AS builder
+
+RUN cargo build --release --offline
+
+FROM debian:buster-slim
+
+ENV ROCKET_ENV=production
+
+EXPOSE 8000
+
+COPY --from=builder /code/target/release/react-rust-postgres /react-rust-postgres
+
+CMD [ "/react-rust-postgres" ]

react-rust-postgres/backend/diesel.toml

@@ -0,0 +1,5 @@
+# For documentation on how to configure this file,
+# see diesel.rs/guides/configuring-diesel-cli
+
+[print_schema]
+file = "src/schema.rs"

react-rust-postgres/backend/migrations/00000000000000_diesel_initial_setup/down.sql

@@ -0,0 +1,6 @@
+-- This file was automatically created by Diesel to setup helper functions
+-- and other internal bookkeeping. This file is safe to edit, any future
+-- changes will be added to existing projects as new migrations.
+
+DROP FUNCTION IF EXISTS diesel_manage_updated_at(_tbl regclass);
+DROP FUNCTION IF EXISTS diesel_set_updated_at();

react-rust-postgres/backend/migrations/00000000000000_diesel_initial_setup/up.sql

@@ -0,0 +1,36 @@
+-- This file was automatically created by Diesel to setup helper functions
+-- and other internal bookkeeping. This file is safe to edit, any future
+-- changes will be added to existing projects as new migrations.
+
+
+
+
+-- Sets up a trigger for the given table to automatically set a column called
+-- `updated_at` whenever the row is modified (unless `updated_at` was included
+-- in the modified columns)
+--
+-- # Example
+--
+-- ```sql
+-- CREATE TABLE users (id SERIAL PRIMARY KEY, updated_at TIMESTAMP NOT NULL DEFAULT NOW());
+--
+-- SELECT diesel_manage_updated_at('users');
+-- ```
+CREATE OR REPLACE FUNCTION diesel_manage_updated_at(_tbl regclass) RETURNS VOID AS $$
+BEGIN
+    EXECUTE format('CREATE TRIGGER set_updated_at BEFORE UPDATE ON %s
+                    FOR EACH ROW EXECUTE PROCEDURE diesel_set_updated_at()', _tbl);
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE OR REPLACE FUNCTION diesel_set_updated_at() RETURNS trigger AS $$
+BEGIN
+    IF (
+        NEW IS DISTINCT FROM OLD AND
+        NEW.updated_at IS NOT DISTINCT FROM OLD.updated_at
+    ) THEN
+        NEW.updated_at := current_timestamp;
+    END IF;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;

react-rust-postgres/backend/migrations/2020-03-26-084736_create_people/down.sql

@@ -0,0 +1 @@
+DROP TABLE users;

react-rust-postgres/backend/migrations/2020-03-26-084736_create_people/up.sql

@@ -0,0 +1,4 @@
+CREATE TABLE users (
+  id SERIAL PRIMARY KEY,
+  login TEXT UNIQUE NOT NULL
+);

react-rust-postgres/backend/readme.md

@@ -0,0 +1,4 @@
+# Backend
+
+This backend is made with Rust using [Rocket](https://rocket.rs/) as a web server and [Diesel](https://diesel.rs/) as an ORM.
+

react-rust-postgres/backend/src/main.rs

@@ -0,0 +1,96 @@
+#![feature(proc_macro_hygiene, decl_macro)]
+
+#[macro_use]
+extern crate diesel;
+#[macro_use]
+extern crate diesel_migrations;
+#[macro_use]
+extern crate rocket;
+#[macro_use]
+extern crate serde_derive;
+#[macro_use]
+extern crate rocket_contrib;
+
+mod schema;
+mod user;
+
+use rocket::config::{Config, Environment, Value};
+use rocket::fairing::AdHoc;
+use rocket_contrib::json::Json;
+use std::collections::HashMap;
+use std::env;
+
+// This macro from `diesel_migrations` defines an `embedded_migrations` module
+// containing a function named `run`. This allows the example to be run and
+// tested without any outside setup of the database.
+embed_migrations!();
+
+#[database("my_db")]
+struct MyDBConn(diesel::PgConnection);
+
+#[derive(Serialize)]
+struct HelloMessage {
+    message: String,
+}
+
+#[get("/")]
+fn index(conn: MyDBConn) -> Json<HelloMessage> {
+    let result = match user::User::all(&*conn) {
+        Ok(res) => res.len(),
+        Err(_) => 0,
+    };
+
+    Json(HelloMessage {
+        message: format!("Hello with {} users", result),
+    })
+}
+
+fn get_config() -> Config {
+    let mut database_config = HashMap::new();
+    let mut databases = HashMap::new();
+
+    let env_address = env::var("ROCKET_ADDRESS")
+        .or::<String>(Ok(String::from("localhost")))
+        .unwrap();
+
+    let env_mode = env::var("ROCKET_ENV")
+        .or(Ok(String::from("development")))
+        .and_then(|value| value.parse::<Environment>())
+        .unwrap();
+
+    let database_url = match env::var("DATABASE_URL") {
+        Ok(value) => value,
+        Err(_) => String::from("postgres://localhost/postgres"),
+    };
+
+    database_config.insert("url", Value::from(database_url));
+    databases.insert("my_db", Value::from(database_config));
+
+    let config = Config::build(env_mode)
+        .address(env_address)
+        .extra("databases", databases)
+        .finalize()
+        .unwrap();
+
+    config
+}
+
+fn run_db_migrations(r: rocket::Rocket) -> Result<rocket::Rocket, rocket::Rocket> {
+    let conn = MyDBConn::get_one(&r).expect("database connection");
+    match embedded_migrations::run(&*conn) {
+        Ok(()) => Ok(r),
+        Err(e) => {
+            println!("Failed to run database migrations: {:?}", e);
+            Err(r)
+        }
+    }
+}
+
+fn main() {
+    let config = get_config();
+    rocket::custom(config)
+        .attach(MyDBConn::fairing())
+        .attach(AdHoc::on_attach("Database Migrations", run_db_migrations))
+        .mount("/", routes![index])
+        .launch();
+}

react-rust-postgres/backend/src/schema.rs

@@ -0,0 +1,6 @@
+table! {
+    users (id) {
+        id -> Int4,
+        login -> Text,
+    }
+}

react-rust-postgres/backend/src/user.rs

@@ -0,0 +1,18 @@
+#![allow(proc_macro_derive_resolution_fallback)]
+
+use diesel;
+use diesel::prelude::*;
+use super::schema::users;
+
+#[derive(Queryable, AsChangeset, Serialize, Deserialize)]
+#[table_name = "users"]
+pub struct User {
+    pub id: i32,
+    pub login: String,
+}
+
+impl User {
+    pub fn all(connection: &PgConnection) -> QueryResult<Vec<User>> {
+        users::table.load::<User>(&*connection)
+    }
+}

react-rust-postgres/docker-compose.yaml

@@ -0,0 +1,43 @@
+version: "3.7"
+services:
+  frontend:
+    build:
+      context: frontend
+      target: development
+    networks:
+      - client-side
+    ports:
+      - 3000:3000
+    volumes:
+      - ./frontend/src:/code/src:ro
+  backend:
+    build:
+      context: backend
+      target: development
+    environment:
+      - DATABASE_URL=postgres://postgres:mysecretpassword@db/postgres
+    networks:
+      - client-side
+      - server-side
+    volumes:
+      - ./backend/src:/code/src
+      - backend-cache:/code/target
+    depends_on:
+      - db
+  db:
+    image: postgres:12-alpine
+    restart: always
+    environment:
+      - POSTGRES_PASSWORD=mysecretpassword
+    networks:
+      - server-side
+    ports:
+      - 5432:5432
+    volumes:
+      - db-data:/var/lib/postgresql/data
+networks:
+  client-side: {}
+  server-side: {}
+volumes:
+  backend-cache: {}
+  db-data: {}

react-rust-postgres/frontend/.dockerignore

@@ -0,0 +1,2 @@
+node_modules
+build

react-rust-postgres/frontend/.gitignore

@@ -0,0 +1,23 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

react-rust-postgres/frontend/Dockerfile

@@ -0,0 +1,20 @@
+FROM node:lts AS development
+
+ENV CI=true
+ENV PORT=3000
+
+WORKDIR /code
+COPY package.json /code/package.json
+COPY package-lock.json /code/package-lock.json
+RUN npm ci
+COPY . /code
+
+CMD [ "npm", "start" ]
+
+FROM development AS builder
+
+RUN npm run build
+
+FROM nginx:1.13-alpine
+
+COPY --from=builder /code/build /usr/share/nginx/html

react-rust-postgres/frontend/README.md

@@ -0,0 +1,68 @@
+This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+
+## Available Scripts
+
+In the project directory, you can run:
+
+### `npm start`
+
+Runs the app in the development mode.<br />
+Open [http://localhost:3000](http://localhost:3000) to view it in the browser.
+
+The page will reload if you make edits.<br />
+You will also see any lint errors in the console.
+
+### `npm test`
+
+Launches the test runner in the interactive watch mode.<br />
+See the section about [running tests](https://facebook.github.io/create-react-app/docs/running-tests) for more information.
+
+### `npm run build`
+
+Builds the app for production to the `build` folder.<br />
+It correctly bundles React in production mode and optimizes the build for the best performance.
+
+The build is minified and the filenames include the hashes.<br />
+Your app is ready to be deployed!
+
+See the section about [deployment](https://facebook.github.io/create-react-app/docs/deployment) for more information.
+
+### `npm run eject`
+
+**Note: this is a one-way operation. Once you `eject`, you can’t go back!**
+
+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.
+
+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.
+
+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.
+
+## Learn More
+
+You can learn more in the [Create React App documentation](https://facebook.github.io/create-react-app/docs/getting-started).
+
+To learn React, check out the [React documentation](https://reactjs.org/).
+
+### Code Splitting
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/code-splitting
+
+### Analyzing the Bundle Size
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size
+
+### Making a Progressive Web App
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app
+
+### Advanced Configuration
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/advanced-configuration
+
+### Deployment
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/deployment
+
+### `npm run build` fails to minify
+
+This section has moved here: https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify

react-rust-postgres/frontend/package.json

@@ -0,0 +1,37 @@
+{
+  "name": "frontend",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@testing-library/jest-dom": "^4.2.4",
+    "@testing-library/react": "^9.5.0",
+    "@testing-library/user-event": "^7.2.1",
+    "react": "^16.13.1",
+    "react-dom": "^16.13.1",
+    "react-scripts": "3.4.1"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": "react-app"
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  },
+  "devDependencies": {
+    "http-proxy-middleware": "^1.0.3"
+  }
+}

react-rust-postgres/frontend/public/index.html

@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta
+      name="description"
+      content="Web site created using create-react-app"
+    />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <!--
+      manifest.json provides metadata used when your web app is installed on a
+      user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
+    -->
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <!--
+      Notice the use of %PUBLIC_URL% in the tags above.
+      It will be replaced with the URL of the `public` folder during the build.
+      Only files inside the `public` folder can be referenced from the HTML.
+
+      Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
+      work correctly both with client-side routing and a non-root public URL.
+      Learn how to configure a non-root public URL by running `npm run build`.
+    -->
+    <title>React App</title>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+    <!--
+      This HTML file is a template.
+      If you open it directly in the browser, you will see an empty page.
+
+      You can add webfonts, meta tags, or analytics to this file.
+      The build step will place the bundled scripts into the <body> tag.
+
+      To begin the development, run `npm start` or `yarn start`.
+      To create a production bundle, use `npm run build` or `yarn build`.
+    -->
+  </body>
+</html>

react-rust-postgres/frontend/public/manifest.json

@@ -0,0 +1,25 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

react-rust-postgres/frontend/public/robots.txt

@@ -0,0 +1,3 @@
+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:

react-rust-postgres/frontend/src/App.css

@@ -0,0 +1,38 @@
+.App {
+  text-align: center;
+}
+
+.App-logo {
+  height: 40vmin;
+  pointer-events: none;
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  .App-logo {
+    animation: App-logo-spin infinite 20s linear;
+  }
+}
+
+.App-header {
+  background-color: #282c34;
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  font-size: calc(10px + 2vmin);
+  color: white;
+}
+
+.App-link {
+  color: #61dafb;
+}
+
+@keyframes App-logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}

react-rust-postgres/frontend/src/App.js

@@ -0,0 +1,34 @@
+import React, { useEffect, useState } from "react";
+import logo from "./logo.svg";
+import "./App.css";
+
+function App() {
+  const [message, setMessage] = useState();
+  useEffect(() => {
+    fetch("/api/")
+      .then(res => res.json())
+      .then(res => setMessage(res.message))
+      .catch(console.error);
+  }, [setMessage]);
+  return (
+    <div className="App">
+      <header className="App-header">
+        <img src={logo} className="App-logo" alt="logo" />
+        <p>{message || "Loading..."}</p>
+        <p>
+          Edit <code>src/App.js</code> and save to reload.
+        </p>
+        <a
+          className="App-link"
+          href="https://reactjs.org"
+          target="_blank"
+          rel="noopener noreferrer"
+        >
+          Learn React
+        </a>
+      </header>
+    </div>
+  );
+}
+
+export default App;

react-rust-postgres/frontend/src/App.test.js

@@ -0,0 +1,9 @@
+import React from 'react';
+import { render } from '@testing-library/react';
+import App from './App';
+
+test('renders learn react link', () => {
+  const { getByText } = render(<App />);
+  const linkElement = getByText(/learn react/i);
+  expect(linkElement).toBeInTheDocument();
+});

react-rust-postgres/frontend/src/index.css

@@ -0,0 +1,13 @@
+body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
+    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
+    sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+code {
+  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
+    monospace;
+}

react-rust-postgres/frontend/src/index.js

@@ -0,0 +1,17 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import './index.css';
+import App from './App';
+import * as serviceWorker from './serviceWorker';
+
+ReactDOM.render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+  document.getElementById('root')
+);
+
+// If you want your app to work offline and load faster, you can change
+// unregister() to register() below. Note this comes with some pitfalls.
+// Learn more about service workers: https://bit.ly/CRA-PWA
+serviceWorker.unregister();

react-rust-postgres/frontend/src/logo.svg

@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
+    <g fill="#61DAFB">
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react-rust-postgres/frontend/src/serviceWorker.js

@@ -0,0 +1,141 @@
+// This optional code is used to register a service worker.
+// register() is not called by default.
+
+// This lets the app load faster on subsequent visits in production, and gives
+// it offline capabilities. However, it also means that developers (and users)
+// will only see deployed updates on subsequent visits to a page, after all the
+// existing tabs open on the page have been closed, since previously cached
+// resources are updated in the background.
+
+// To learn more about the benefits of this model and instructions on how to
+// opt-in, read https://bit.ly/CRA-PWA
+
+const isLocalhost = Boolean(
+  window.location.hostname === 'localhost' ||
+    // [::1] is the IPv6 localhost address.
+    window.location.hostname === '[::1]' ||
+    // 127.0.0.0/8 are considered localhost for IPv4.
+    window.location.hostname.match(
+      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
+    )
+);
+
+export function register(config) {
+  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
+    // The URL constructor is available in all browsers that support SW.
+    const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
+    if (publicUrl.origin !== window.location.origin) {
+      // Our service worker won't work if PUBLIC_URL is on a different origin
+      // from what our page is served on. This might happen if a CDN is used to
+      // serve assets; see https://github.com/facebook/create-react-app/issues/2374
+      return;
+    }
+
+    window.addEventListener('load', () => {
+      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
+
+      if (isLocalhost) {
+        // This is running on localhost. Let's check if a service worker still exists or not.
+        checkValidServiceWorker(swUrl, config);
+
+        // Add some additional logging to localhost, pointing developers to the
+        // service worker/PWA documentation.
+        navigator.serviceWorker.ready.then(() => {
+          console.log(
+            'This web app is being served cache-first by a service ' +
+              'worker. To learn more, visit https://bit.ly/CRA-PWA'
+          );
+        });
+      } else {
+        // Is not localhost. Just register service worker
+        registerValidSW(swUrl, config);
+      }
+    });
+  }
+}
+
+function registerValidSW(swUrl, config) {
+  navigator.serviceWorker
+    .register(swUrl)
+    .then(registration => {
+      registration.onupdatefound = () => {
+        const installingWorker = registration.installing;
+        if (installingWorker == null) {
+          return;
+        }
+        installingWorker.onstatechange = () => {
+          if (installingWorker.state === 'installed') {
+            if (navigator.serviceWorker.controller) {
+              // At this point, the updated precached content has been fetched,
+              // but the previous service worker will still serve the older
+              // content until all client tabs are closed.
+              console.log(
+                'New content is available and will be used when all ' +
+                  'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
+              );
+
+              // Execute callback
+              if (config && config.onUpdate) {
+                config.onUpdate(registration);
+              }
+            } else {
+              // At this point, everything has been precached.
+              // It's the perfect time to display a
+              // "Content is cached for offline use." message.
+              console.log('Content is cached for offline use.');
+
+              // Execute callback
+              if (config && config.onSuccess) {
+                config.onSuccess(registration);
+              }
+            }
+          }
+        };
+      };
+    })
+    .catch(error => {
+      console.error('Error during service worker registration:', error);
+    });
+}
+
+function checkValidServiceWorker(swUrl, config) {
+  // Check if the service worker can be found. If it can't reload the page.
+  fetch(swUrl, {
+    headers: { 'Service-Worker': 'script' },
+  })
+    .then(response => {
+      // Ensure service worker exists, and that we really are getting a JS file.
+      const contentType = response.headers.get('content-type');
+      if (
+        response.status === 404 ||
+        (contentType != null && contentType.indexOf('javascript') === -1)
+      ) {
+        // No service worker found. Probably a different app. Reload the page.
+        navigator.serviceWorker.ready.then(registration => {
+          registration.unregister().then(() => {
+            window.location.reload();
+          });
+        });
+      } else {
+        // Service worker found. Proceed as normal.
+        registerValidSW(swUrl, config);
+      }
+    })
+    .catch(() => {
+      console.log(
+        'No internet connection found. App is running in offline mode.'
+      );
+    });
+}
+
+export function unregister() {
+  if ('serviceWorker' in navigator) {
+    navigator.serviceWorker.ready
+      .then(registration => {
+        registration.unregister();
+      })
+      .catch(error => {
+        console.error(error.message);
+      });
+  }
+}

react-rust-postgres/frontend/src/setupProxy.js

@@ -0,0 +1,11 @@
+const { createProxyMiddleware } = require("http-proxy-middleware");
+
+module.exports = function(app) {
+  app.use(
+    "/api",
+    createProxyMiddleware({
+      target: "http://backend:8000",
+      pathRewrite: { "^/api": "" }
+    })
+  );
+};

react-rust-postgres/frontend/src/setupTests.js

@@ -0,0 +1,5 @@
+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom/extend-expect';

react-rust-postgres/readme.md

@@ -0,0 +1,76 @@
+## Compose sample application
+
+### React application with a Rust backend and a Postgresql database
+
+Project structure:
+```
+.
+├── backend
+│   ├── Dockerfile
+│   ...
+├── docker-compose.yaml
+├── frontend
+│   ├── ...
+│   └── Dockerfile
+└── README.md
+```
+
+[_docker-compose.yaml_](docker-compose.yaml)
+```
+services:
+  backend:
+    build: backend
+    ...
+  db:
+    image: postgres:12-alpine
+    ...
+  frontend:
+    build: frontend
+    ports:
+    - 3000:3000
+    ...
+```
+The compose file defines an application with three services `frontend`, `backend` and `db`.
+When deploying the application, docker-compose maps port 3000 of the frontend service container to port 3000 of the host as specified in the file.
+Make sure port 3000 on the host is not already being in use.
+
+## Deploy with docker-compose
+
+```
+$ docker-compose up -d
+Creating network "react-rust-postgres_default" with the default driver
+Building backend
+...
+Successfully tagged react-rust-postgres_frontend:latest
+WARNING: Image for service frontend was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
+Creating react-rust-postgres_frontend_1 ... done
+Creating react-rust-postgres_db_1       ... done
+Creating react-rust-postgres_backend_1  ... done
+```
+
+## Expected result
+
+Listing containers must show three containers running and the port mapping as below:
+```
+$ docker ps
+CONTAINER ID        IMAGE                          COMMAND                  CREATED             STATUS              PORTS                    NAMES
+30b7d9dc4898        react-rust-postgres_backend    "cargo run --offline"    37 seconds ago      Up 35 seconds       8000/tcp                 react-rust-postgres_backend_1
+0bca0cb682b8        react-rust-postgres_frontend   "docker-entrypoint.s…"   42 seconds ago      Up 41 seconds       0.0.0.0:3000->3000/tcp   react-rust-postgres_frontend_1
+1611961bf3d1        postgres:12-alpine             "docker-entrypoint.s…"   42 seconds ago      Up 36 seconds       0.0.0.0:5432->5432/tcp   react-rust-postgres_db_1
+```
+
+After the application starts, navigate to `http://localhost:3000` in your web browser to get a colorful message.
+
+![page](./capture.png)
+
+Stop and remove the containers
+```
+$ docker-compose down
+Stopping react-rust-postgres_backend_1  ... done
+Stopping react-rust-postgres_frontend_1 ... done
+Stopping react-rust-postgres_db_1       ... done
+Removing react-rust-postgres_backend_1  ... done
+Removing react-rust-postgres_frontend_1 ... done
+Removing react-rust-postgres_db_1       ... done
+Removing network react-rust-postgres_default
+```