├── .gitignore
├── package.json
├── readme.md
├── services
    ├── email.service.js
    ├── user.service.js
    └── auth.service.js
└── index.js


/.gitignore:
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1 | node_modules


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/package.json:
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 1 | {
 2 |   "name": "microservices-example",
 3 |   "version": "1.0.0",
 4 |   "description": "",
 5 |   "main": "index.js",
 6 |   "type": "module",
 7 |   "scripts": {
 8 |     "start": "node index"
 9 |   },
10 |   "keywords": [],
11 |   "author": "",
12 |   "license": "ISC",
13 |   "dependencies": {
14 |     "moleculer": "^0.14.32"
15 |   }
16 | }
17 | 


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/readme.md:
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 1 | # Microservices Example
 2 | 
 3 | Simple example of how to create microservices with the [Moleculer framework](https://moleculer.services).
 4 | 
 5 | This is the code from the [Microservices Crash Course](https://youtu.be/fEDT4lWWe9g) on YouTube. There are 3 very simple services (user, email, auth) with actions to mock/simulate creating a user, getting users, sending an email and authenticating a user.
 6 | 
 7 | ## Usage
 8 | 
 9 | Run the services:
10 | 
11 | ```bash
12 | npm start
13 | ```
14 | 


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/services/email.service.js:
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 1 | import { ServiceBroker } from 'moleculer';
 2 | 
 3 | const broker = new ServiceBroker();
 4 | 
 5 | broker.createService({
 6 |   name: 'email',
 7 |   actions: {
 8 |     async sendEmail(ctx) {
 9 |       const { recipient, subject, content } = ctx.params;
10 |       // Simulated email logic
11 |       console.log(`Sending email to ${recipient} with subject ${subject}`);
12 |       console.log(`Content: ${content}`);
13 |       return `Email sent to ${recipient}`;
14 |     },
15 |   },
16 | });
17 | 
18 | export default broker;
19 | 


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/services/user.service.js:
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 1 | import { ServiceBroker } from 'moleculer';
 2 | 
 3 | const broker = new ServiceBroker();
 4 | 
 5 | function generateId() {
 6 |   return Math.floor(Math.random() * 1000) + 1;
 7 | }
 8 | 
 9 | const users = [];
10 | 
11 | broker.createService({
12 |   name: 'user',
13 |   actions: {
14 |     async createUser(ctx) {
15 |       const { username, email } = ctx.params;
16 |       const newUser = { id: generateId(), username, email };
17 |       users.push(newUser);
18 |       return newUser;
19 |     },
20 |     async getUsers(ctx) {
21 |       return users;
22 |     },
23 |   },
24 | });
25 | 
26 | export default broker;
27 | 


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/services/auth.service.js:
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 1 | import { ServiceBroker } from 'moleculer';
 2 | 
 3 | const broker = new ServiceBroker();
 4 | 
 5 | broker.createService({
 6 |   name: 'auth',
 7 |   actions: {
 8 |     async authUser(ctx) {
 9 |       const { username, password } = ctx.params;
10 | 
11 |       if (username === 'admin' && password === 'password') {
12 |         return {
13 |           success: true,
14 |           message: 'Auth was successful',
15 |         };
16 |       } else {
17 |         return {
18 |           success: false,
19 |           message: 'Auth failed',
20 |         };
21 |       }
22 |     },
23 |   },
24 | });
25 | 
26 | export default broker;
27 | 


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/index.js:
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 1 | import UserService from './services/user.service.js';
 2 | import EmailService from './services/email.service.js';
 3 | import AuthService from './services/auth.service.js';
 4 | 
 5 | async function startApp() {
 6 |   // Start services
 7 |   await UserService.start();
 8 |   await EmailService.start();
 9 |   await AuthService.start();
10 | 
11 |   try {
12 |     // Simulate user creation
13 |     const newUser = await UserService.call('user.createUser', {
14 |       username: 'john',
15 |       email: 'john@gmail.com',
16 |     });
17 |     console.log('New User Created:', newUser);
18 |     const users = await UserService.call('user.getUsers');
19 |     console.log('All Users:', users);
20 | 
21 |     // Simulate sending email
22 |     const emailResult = await EmailService.call('email.sendEmail', {
23 |       recipient: newUser.email,
24 |       subject: 'Welcome to our platform!',
25 |       content: 'Thank you for signing up',
26 |     });
27 |     console.log(emailResult);
28 | 
29 |     // Simulate auth
30 |     const authResult = await AuthService.call('auth.authUser', {
31 |       username: 'admin',
32 |       password: 'password',
33 |     });
34 | 
35 |     console.log('Auth result:', authResult);
36 |   } catch (error) {
37 |     console.log('Error:', error);
38 |   } finally {
39 |     await UserService.stop();
40 |     await EmailService.stop();
41 |     await AuthService.stop();
42 |   }
43 | }
44 | 
45 | startApp();
46 | 


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