Microservices with NestJS and RabbitMQ

This repository contains an example of building microservices using NestJS, RabbitMQ, and integrating multiple databases such as MySQL and MongoDB.

Prerequisites

• Node.js
• Docker & Docker Compose

Installation

1. Clone the repo

   git clone https://github.com/wardvisual/microservices-nestjs.git

2. Start the databases and RabbitMQ

   docker-compose up -d

3. Install the dependencies

   cd admin && npm install

   cd user && npm install

4. Create .env file in admin directory

   MYSQL_DB_PORT=3307
   MYSQL_DB_USERNAME=root
   MYSQL_DB_PASSWORD=password
   MYSQL_DB_NAME=mn_admin_db
   AMQP_URL=amqp://guest:guest@localhost:5672

5. Create .env file in user directory

   MONGO_URI=mongodb://root:password@localhost:3308/admin
   AMQP_URL=amqp://guest:guest@localhost:5672

Running the Application

1. Start the admin service (runs on port 8000)

   cd admin && npm run start:dev

2. Start the user service (runs on port 8001)

   cd user && npm run start:dev

3. Start the user message listener

   cd user && npm run listen

Architecture

• Admin Service: REST API connected to MySQL database. Emits events to RabbitMQ when products are created, updated, or deleted.
• User Service: REST API connected to MongoDB. Listens for events from RabbitMQ and syncs product data.
• RabbitMQ: Message broker for communication between services using user_queue.

API Endpoints

Admin Service (http://localhost:8000/api)

Method	Endpoint	Description
GET	/products	Get all products
GET	/products/:id	Get product by id
POST	/products	Create a product
PATCH	/products/:id	Update a product
DELETE	/products/:id	Delete a product
PATCH	/products/:id/like	Like a product

User Service (http://localhost:8001/api)

Method	Endpoint	Description
GET	/products	Get all products
PATCH	/products/:id/like	Like a product

Docker Services

Service	Port	Description
MySQL	3307	Admin database
MongoDB	3308	User database
RabbitMQ	5672	Message broker
RabbitMQ	15672	Management UI

License

Distributed under the MIT License. See LICENSE for more information.

Contact

Edward Fernandez: Wardvisual