ecommerce-microservice

An ecommerce api with microservice architecture.

Architecture

This project implements a microservices-based e-commerce application, encompassing user authentication, product management, and order processing. It emphasizes concurrency control, clustering for high availability, and database integration.

• Services:

  • Authentication Service: Manages user registration, login, and access control.
  • Product Service: Handles product creation, retrieval, updates, and deletion.
  • Order Service: Processes order placement, validation, and status updates.
  • API Gateway: Acts as a single entry point for all API requests, routing them to relevant services.

• Technology Stack:

  • Node with Express for microservices.
  • Docker for containerization and deployment.
  • Docker Compose for orchestration.
  • PostgreSQL databases for data storage.
  • RabbitMQ for asynchronous communication.
  • RESTful APIs for communication between services and clients.

Concurrency Control

• Pessimistic Locking: Implemented pessimistic locking to maintain data integrity when multiple users try to order or update a product.

Database Integration

• Databases: Three PostgreSQL databases (auth, product, order) for service-specific data.
• Schema Design: Normalized schema for each database ensures data integrity and efficient querying.

APIs and Communication

• RESTful APIs: Each service exposes well-defined RESTful APIs (e.g., GET, POST, PUT, DELETE) for CRUD operations.
• Authentication: JWT-based authentication for secure access to protected endpoints.
• Authorization: Role-based access control (RBAC) restricts users to their relevant data.
• Communication:
  • Synchronous REST calls for immediate responses.
  • Asynchronous AMQP protocol using RabbitMQ for decoupled interactions.
  • Order service calls product service for details, creates order with pending status, and publishes to product queue for stock update.
  • Product service consumes the product queue, updates stock, and publishes to order queue for status update.

Prerequisites

• Docker installed with docker-compose enabled
• Postman (for API testing)

Installation

Using docker-compose

• Clone the repo
• Run docker-compose build
• Run docker-compose up.
• The APIs are running on http://localhost:5000

Using local configuration

• Clone the repo
• Run npm install in each service folder (auth, product, order, api-gateway)
• Configure 3 postgres databases and rabbitmq locally
• Create .env file for each service according to .env.example and provide required variables
• Run all the services using npm start
• The APIs are running on http://localhost:5000

Testing

Import the Postman collection in repo inside Postman. It contains all the API endpoints along with payload description.