Microservices Architecture — Auth & Product Service

Overview

This project demonstrates a microservices-based architecture using NestJS, RabbitMQ, and MongoDB. It consists of two independent services:

• Auth Service → Handles authentication and user management
• Product Service → Manages product catalog with authorization

Both services communicate asynchronously via RabbitMQ.

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Architecture

Client → Product Service → RabbitMQ → Auth Service

• No direct HTTP communication between services
• All inter-service communication is handled via RabbitMQ

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Tech Stack

• Framework: NestJS
• Messaging Broker: RabbitMQ
• Database: MongoDB (Typegoose)
• Containerization: Docker & Docker Compose
• Authentication: JWT (Access + Refresh Tokens)

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Project Structure (Monorepo)

. ├── auth-service/ │ ├── src/ │ ├── Dockerfile │ └── .env │ ├── product-service/ │ ├── src/ │ ├── Dockerfile │ └── .env │ ├── docker-compose.yml └── README.md

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Auth Service Responsibilities

• User registration & login
• JWT generation (access + refresh tokens)
• Token validation via RabbitMQ
• Emits events (e.g., user.created)

Key Message Patterns

• validate_token → Validates JWT and returns user info

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Product Service Responsibilities

• Product CRUD operations
• Associates products with users
• Validates JWT via Auth Service (RabbitMQ)
• Authorization: only product owners can update/delete

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Inter-Service Communication Flow

Token Validation Flow

1. Client sends request with JWT to Product Service
2. Product Service sends validate_token message via RabbitMQ
3. Auth Service verifies token and responds with user data
4. Product Service proceeds with request

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Running the Project with Docker

1. Clone the repository

git clone https://github.com/protickr/lyxa-assignment.git
cd lyxa-assignment
2. Setup environment variables

Create .env files inside:

auth-service/.env
product-service/.env

(See .env.example below)

3. Run services
docker-compose up --build
4. Access Services
Service	URL
Auth Service	http://localhost:8000

Product Service	http://localhost:8001

RabbitMQ UI	http://localhost:15672

Environment Variables

auth-service/.env
PORT=3000
MONGO_URI=mongodb://mongo-auth:27017/auth-db
JWT_SECRET=supersecret
RABBITMQ_URL=amqp://rabbitmq:5672

product-service/.env
PORT=3001
MONGO_URI=mongodb://mongo-product:27017/product-db
RABBITMQ_URL=amqp://rabbitmq:5672

📬 Example API Flow
1. Register User
POST /auth/register

2. Login User
POST /auth/login

→ Returns JWT

3. Create Product
POST /products

Authorization: Bearer <token>

Features Implemented
Microservices architecture using NestJS
RabbitMQ-based communication
JWT authentication (access token)
Authorization (resource ownership)
Dockerized services
Clean modular structure