feat: add usecase Nest microservices

Author: Skippia

Nest-microservices/.eslintrc.js

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+module.exports = {
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    project: 'tsconfig.json',
+    sourceType: 'module',
+  },
+  plugins: ['@typescript-eslint/eslint-plugin'],
+  extends: [
+    'plugin:@typescript-eslint/recommended',
+    'prettier/@typescript-eslint',
+    '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',
+  },
+};

Nest-microservices/.gitignore

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+# compiled output
+/dist
+/node_modules
+
+# Logs
+logs
+*.log
+npm-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

Nest-microservices/.prettierrc

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

Nest-microservices/apps/common/AllExceptionFilter.ts

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+
+import {
+	ExceptionFilter,
+	Catch,
+	ArgumentsHost,
+	HttpException,
+	HttpStatus,
+} from '@nestjs/common';
+import { HttpAdapterHost } from '@nestjs/core';
+
+@Catch()
+export class AllExceptionsFilter implements ExceptionFilter {
+	constructor(private readonly httpAdapterHost: HttpAdapterHost) { }
+
+	catch(exception: unknown, host: ArgumentsHost): void {
+		// In certain situations `httpAdapter` might not be available in the
+		// constructor method, thus we should resolve it here.
+		const { httpAdapter } = this.httpAdapterHost;
+
+		const ctx = host.switchToHttp();
+
+		console.log('INTERCEPT CONTEXT', ctx)
+		const httpStatus =
+			exception instanceof HttpException
+				? exception.getStatus()
+				: HttpStatus.INTERNAL_SERVER_ERROR;
+
+		const responseBody = {
+			statusCode: httpStatus,
+			timestamp: new Date().toISOString(),
+			path: httpAdapter.getRequestUrl(ctx.getRequest()),
+		};
+
+		httpAdapter.reply(ctx.getResponse(), responseBody, httpStatus);
+	}
+}

Nest-microservices/apps/gateway/Dockerfile

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+FROM node:alpine
+
+WORKDIR /usr/src/app
+
+COPY package*.json ./
+
+RUN npm install
+
+COPY . .
+
+RUN npm run build gateway

Nest-microservices/apps/gateway/src/app.controller.ts

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+import { Controller, Get } from '@nestjs/common';
+import { v4 as uuid } from 'uuid';
+import { AmqpConnection } from '@golevelup/nestjs-rabbitmq';
+
+@Controller()
+export class AppController {
+  constructor(private readonly amqpConnection: AmqpConnection) {
+  }
+
+  @Get('create-stock')
+  async createStock() {
+
+    const backResponse = await this.amqpConnection.request({
+      exchange: 'stock',
+      routingKey: 'stock-route',
+      payload: { stockId: uuid(), quantity: 5, name: 'Jaffa Cake' }
+    });
+
+    console.log('1. msg published', 'stock', 'stock-route')
+
+    console.log('3 Result back:', backResponse)
+
+    return backResponse
+
+
+  }
+}

Nest-microservices/apps/gateway/src/app.module.ts

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+import { RabbitMQModule } from '@golevelup/nestjs-rabbitmq';
+import { Module } from '@nestjs/common';
+import { AppController } from './app.controller';
+
+@Module({
+  imports: [
+    RabbitMQModule.forRoot(RabbitMQModule, {
+      exchanges: [
+        {
+          name: 'stock',
+          type: 'topic',
+        },
+      ],
+      uri: 'amqp://user:password@rabbitmq:5672',
+      connectionInitOptions: { wait: true },
+    }),
+    AppModule,
+  ],
+  controllers: [AppController],
+})
+export class AppModule { }

Nest-microservices/apps/gateway/src/main.ts

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+import { HttpAdapterHost, NestFactory } from '@nestjs/core';
+import { AppModule } from './app.module';
+import { AllExceptionsFilter } from 'apps/common/AllExceptionFilter';
+
+async function bootstrap() {
+  const app = await NestFactory.create(AppModule);
+  
+  await app.listen(3000);
+}
+
+bootstrap();

Nest-microservices/apps/gateway/tsconfig.app.json

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

Nest-microservices/apps/service-stock/Dockerfile

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+FROM node:alpine
+
+WORKDIR /usr/src/app
+
+COPY package*.json ./
+
+RUN npm install
+
+COPY . .
+
+RUN npm run build service-stock