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🧠 Technical Breakdown: BookStore Microservices Architecture

🧱 Microservices Structure

This system is built using a modular microservices approach, where each service is self-contained, independently deployable, and communicates via HTTP or message queues.

🔐 Authentication Service (Django + JWT)

1. Built with Django REST Framework
2. Handles user registration, login, logout, and token-based authentication using JWT
3. Secured endpoints issue and validate access tokens and refresh tokens
4. Role-based access control (optional) can be easily extended

📚 Catalog Service (Flask)

1. Manages book records and inventory data

2. Exposes RESTful endpoints for CRUD operations

3. Processes stock updates via RabbitMQ messages from the Order service

4. Lightweight and easy to scale independently

📦 Order Service (Node.js)

1. Written in Express.js, this service manages:

   • Order placement

   • Order status tracking

   • Stock deduction logic

2. Publishes messages to RabbitMQ (e.g., “Order Placed”), which the Catalog service subscribes to

🚪 API Gateway (Golang)

1. A lightweight custom-built API Gateway in Go

2. Acts as the single entry point for all client requests

3. Handles:

   • Routing to underlying services

   • JWT validation for protected endpoints

   • Basic load-balancing logic

4. Decouples frontend and backend services while maintaining security and central control

📨 RabbitMQ – Message Broker

1. Used for asynchronous inter-service communication

2. Ensures reliable delivery of events like:

   • Order placed → Update catalog stock

   • Future-ready for scalability (e.g., email notifications, analytics)

3. Services use publish/subscribe (Pub/Sub) pattern

🐳 Dockerized Setup

1. Each service has its own Dockerfile

2. A docker-compose.yml file is used during development for:

   • Spinning up all services locally

   • Managing networks and environment variables

3. Ensures environment consistency across development, testing, and staging

☸️ Kubernetes Deployment

1. Each service is containerized and deployed via Kubernetes

2. Uses:

   • Deployments for managing pods

   • Services (ClusterIP, LoadBalancer) for internal and external access

   • Secrets & ConfigMaps for secure and flexible configuration

3. Horizontal scaling can be added to high-load services like Order or Gateway

✅ Security Highlights

1. JWT for secure, stateless authentication

2. API Gateway enforces access control

3. Internal services communicate over a private network using Docker/Kubernetes

📁 Tech Stack Summary