Part-4-B: Apollo federation implementation

api-gateway/.eslintrc.js

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+module.exports = {
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    project: 'tsconfig.json',
+    tsconfigRootDir: __dirname,
+    sourceType: 'module',
+  },
+  plugins: ['@typescript-eslint/eslint-plugin'],
+  extends: [
+    'plugin:@typescript-eslint/recommended',
+    'plugin:prettier/recommended',
+  ],
+  root: true,
+  env: {
+    node: true,
+    jest: true,
+  },
+  ignorePatterns: ['.eslintrc.js'],
+  rules: {
+    '@typescript-eslint/interface-name-prefix': 'off',
+    '@typescript-eslint/explicit-function-return-type': 'off',
+    '@typescript-eslint/explicit-module-boundary-types': 'off',
+    '@typescript-eslint/no-explicit-any': 'off',
+  },
+};

api-gateway/.gitignore

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+# compiled output
+/dist
+/node_modules
+
+# Logs
+logs
+*.log
+npm-debug.log*
+pnpm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# OS
+.DS_Store
+
+# Tests
+/coverage
+/.nyc_output
+
+# IDEs and editors
+/.idea
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# IDE - VSCode
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json

api-gateway/.prettierrc

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+{
+  "singleQuote": true,
+  "trailingComma": "all"
+}

api-gateway/README.md

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+<p align="center">
+  <a href="http://nestjs.com/" target="blank"><img src="https://nestjs.com/img/logo-small.svg" width="200" alt="Nest Logo" /></a>
+</p>
+
+[circleci-image]: https://img.shields.io/circleci/build/github/nestjs/nest/master?token=abc123def456
+[circleci-url]: https://circleci.com/gh/nestjs/nest
+
+  <p align="center">A progressive <a href="http://nodejs.org" target="_blank">Node.js</a> framework for building efficient and scalable server-side applications.</p>
+    <p align="center">
+<a href="https://www.npmjs.com/~nestjscore" target="_blank"><img src="https://img.shields.io/npm/v/@nestjs/core.svg" alt="NPM Version" /></a>
+<a href="https://www.npmjs.com/~nestjscore" target="_blank"><img src="https://img.shields.io/npm/l/@nestjs/core.svg" alt="Package License" /></a>
+<a href="https://www.npmjs.com/~nestjscore" target="_blank"><img src="https://img.shields.io/npm/dm/@nestjs/common.svg" alt="NPM Downloads" /></a>
+<a href="https://circleci.com/gh/nestjs/nest" target="_blank"><img src="https://img.shields.io/circleci/build/github/nestjs/nest/master" alt="CircleCI" /></a>
+<a href="https://coveralls.io/github/nestjs/nest?branch=master" target="_blank"><img src="https://coveralls.io/repos/github/nestjs/nest/badge.svg?branch=master#9" alt="Coverage" /></a>
+<a href="https://discord.gg/G7Qnnhy" target="_blank"><img src="https://img.shields.io/badge/discord-online-brightgreen.svg" alt="Discord"/></a>
+<a href="https://opencollective.com/nest#backer" target="_blank"><img src="https://opencollective.com/nest/backers/badge.svg" alt="Backers on Open Collective" /></a>
+<a href="https://opencollective.com/nest#sponsor" target="_blank"><img src="https://opencollective.com/nest/sponsors/badge.svg" alt="Sponsors on Open Collective" /></a>
+  <a href="https://paypal.me/kamilmysliwiec" target="_blank"><img src="https://img.shields.io/badge/Donate-PayPal-ff3f59.svg"/></a>
+    <a href="https://opencollective.com/nest#sponsor"  target="_blank"><img src="https://img.shields.io/badge/Support%20us-Open%20Collective-41B883.svg" alt="Support us"></a>
+  <a href="https://twitter.com/nestframework" target="_blank"><img src="https://img.shields.io/twitter/follow/nestframework.svg?style=social&label=Follow"></a>
+</p>
+  <!--[![Backers on Open Collective](https://opencollective.com/nest/backers/badge.svg)](https://opencollective.com/nest#backer)
+  [![Sponsors on Open Collective](https://opencollective.com/nest/sponsors/badge.svg)](https://opencollective.com/nest#sponsor)-->
+
+## Description
+
+[Nest](https://github.com/nestjs/nest) framework TypeScript starter repository.
+
+## Installation
+
+```bash
+$ pnpm install
+```
+
+## Running the app
+
+```bash
+# development
+$ pnpm run start
+
+# watch mode
+$ pnpm run start:dev
+
+# production mode
+$ pnpm run start:prod
+```
+
+## Test
+
+```bash
+# unit tests
+$ pnpm run test
+
+# e2e tests
+$ pnpm run test:e2e
+
+# test coverage
+$ pnpm run test:cov
+```
+
+## Support
+
+Nest is an MIT-licensed open source project. It can grow thanks to the sponsors and support by the amazing backers. If you'd like to join them, please [read more here](https://docs.nestjs.com/support).
+
+## Stay in touch
+
+- Author - [Kamil Myśliwiec](https://kamilmysliwiec.com)
+- Website - [https://nestjs.com](https://nestjs.com/)
+- Twitter - [@nestframework](https://twitter.com/nestframework)
+
+## License
+
+Nest is [MIT licensed](LICENSE).

api-gateway/apps/api-gateway/src/app.controller.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { AppController } from './app.controller';
+import { AppService } from './app.service';
+
+describe('AppController', () => {
+  let appController: AppController;
+
+  beforeEach(async () => {
+    const app: TestingModule = await Test.createTestingModule({
+      controllers: [AppController],
+      providers: [AppService],
+    }).compile();
+
+    appController = app.get<AppController>(AppController);
+  });
+
+  describe('root', () => {
+    it('should return "Hello World!"', () => {
+      expect(appController.getHello()).toBe('Hello World!');
+    });
+  });
+});

api-gateway/apps/api-gateway/src/app.controller.ts

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+import { Controller, Get } from '@nestjs/common';
+import { AppService } from './app.service';
+
+@Controller()
+export class AppController {
+  constructor(private readonly appService: AppService) {}
+
+  @Get()
+  getHello(): string {
+    return this.appService.getHello();
+  }
+}

api-gateway/apps/api-gateway/src/app.module.ts

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+import { ApolloGatewayDriver, ApolloGatewayDriverConfig } from '@nestjs/apollo';
+import { Module } from '@nestjs/common';
+import { GraphQLModule } from '@nestjs/graphql';
+import { IntrospectAndCompose, RemoteGraphQLDataSource } from '@apollo/gateway';
+import { AppController } from './app.controller';
+import { AppService } from './app.service';
+import { ConfigModule, ConfigService } from '@nestjs/config';
+
+@Module({
+  imports: [
+    ConfigModule.forRoot({
+      cache: true,
+    }),
+    GraphQLModule.forRootAsync<ApolloGatewayDriverConfig>({
+      driver: ApolloGatewayDriver,
+      imports: [ConfigModule],
+      inject: [ConfigService],
+      useFactory: (configService: ConfigService) => {
+        const options: ApolloGatewayDriverConfig = {
+          gateway: {
+            supergraphSdl: new IntrospectAndCompose({
+              subgraphs: [
+                {
+                  name: 'users',
+                  url: configService.get<string>('USERS_SERVICE_URL'),
+                },
+                {
+                  name: 'books',
+                  url: configService.get<string>('BOOKS_SERVICE_URL'),
+                },
+                {
+                  name: 'authors',
+                  url: configService.get<string>('AUTHORS_SERVICE_URL'),
+                },
+                {
+                  name: 'auth',
+                  url: configService.get<string>('AUTH_SERVICE_URL'),
+                },
+              ],
+            }),
+          },
+        };
+
+        return options;
+      },
+    }),
+  ],
+  controllers: [AppController],
+  providers: [AppService],
+})
+export class AppModule {}

api-gateway/apps/api-gateway/src/app.service.ts

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+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class AppService {
+  getHello(): string {
+    return 'Hello World!';
+  }
+}

api-gateway/apps/api-gateway/src/main.ts

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+import { NestFactory } from '@nestjs/core';
+import { AppModule } from './app.module';
+import * as dotenv from 'dotenv';
+
+async function bootstrap() {
+  dotenv.config();
+  const app = await NestFactory.create(AppModule);
+  await app.listen(process.env.API_GATEWAY_PORT);
+}
+bootstrap();

api-gateway/apps/api-gateway/test/app.e2e-spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { INestApplication } from '@nestjs/common';
+import * as request from 'supertest';
+import { AppModule } from './../src/app.module';
+
+describe('AppController (e2e)', () => {
+  let app: INestApplication;
+
+  beforeEach(async () => {
+    const moduleFixture: TestingModule = await Test.createTestingModule({
+      imports: [AppModule],
+    }).compile();
+
+    app = moduleFixture.createNestApplication();
+    await app.init();
+  });
+
+  it('/ (GET)', () => {
+    return request(app.getHttpServer())
+      .get('/')
+      .expect(200)
+      .expect('Hello World!');
+  });
+});

api-gateway/apps/api-gateway/test/jest-e2e.json

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+{
+  "moduleFileExtensions": ["js", "json", "ts"],
+  "rootDir": ".",
+  "testEnvironment": "node",
+  "testRegex": ".e2e-spec.ts$",
+  "transform": {
+    "^.+\\.(t|j)s$": "ts-jest"
+  }
+}

api-gateway/apps/api-gateway/tsconfig.app.json

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+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "declaration": false,
+    "outDir": "../../dist/apps/api-gateway"
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist", "test", "**/*spec.ts"]
+}

api-gateway/apps/auth/src/auth.module.ts

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+import { Module } from '@nestjs/common';
+import { AuthService } from './auth.service';
+import { AuthResolver } from './auth.resolver';
+// import { UsersModule } from 'apps/users/src/users.module';
+import { JwtModule, JwtModuleOptions, JwtService } from '@nestjs/jwt';
+import { ConfigModule, ConfigService } from '@nestjs/config';
+import { JwtStrategy } from './jwt.strategy';
+import { PassportModule } from '@nestjs/passport';
+import { LocalStrategy } from './local.strategy';
+
+@Module({
+  providers: [
+    AuthService,
+    AuthResolver,
+    JwtService,
+    JwtStrategy,
+    LocalStrategy,
+  ],
+  // We nedd to make sure we've imported the userModule, because we're using it's service
+  imports: [
+    // UsersModule,
+    PassportModule,
+    ConfigModule,
+    JwtModule.registerAsync({
+      inject: [ConfigService],
+      imports: [ConfigModule],
+      useFactory: (configService: ConfigService) => {
+        const properties: JwtModuleOptions = {
+          secret: configService.get<string>('JWT_SECRET'),
+          signOptions: {
+            expiresIn: '24h',
+          },
+        };
+        return properties;
+      },
+    }),
+  ],
+})
+export class AuthModule {}