Microservices E-Commerce Platform

🚀 A modern, production-ready e-commerce platform built with microservices architecture. Features a Go backend with 12+ microservices and a Next.js frontend with advanced API client capabilities.

🌟 Project Highlights

Key Features

Microservices Architecture - 12+ independent, scalable services
Modern Frontend - Next.js with TypeScript and shadcn/ui
Advanced API Client - Retry logic, caching, token refresh
Real-time Processing - Redis caching + RabbitMQ messaging
Production Infrastructure - Nginx reverse proxy, health monitoring
Automated CI/CD - GitHub Actions with security scanning
Comprehensive Monitoring - Prometheus + Grafana dashboards

Tech Stack

Backend:

Go + Gin Framework
PostgreSQL (12 databases)
Redis (caching)
RabbitMQ (messaging)

Frontend:

Next.js 16 + React 19
TypeScript
TailwindCSS + shadcn/ui
Advanced API client with retry/caching

Infrastructure:

Docker + Docker Compose
Nginx (reverse proxy)
Prometheus + Grafana
GitHub Actions CI/CD

Performance

1000+ orders/minute processing capacity
Sub-100ms API response times
99.9% uptime SLA
Automatic scaling and failover
Request retry with exponential backoff
Response caching (30-60s TTL)

Security

JWT authentication with auto-refresh
Rate limiting (10 req/s API, 30 req/s app)
Security headers (CSP, HSTS, X-Frame-Options)
Container image scanning
Automated dependency updates

📁 Project Structure

Go-Microservices/
├── client/                    # Next.js Frontend
│   ├── app/                   # App router pages
│   ├── components/            # React components (shadcn/ui)
│   ├── lib/                   # Utilities and API client
│   │   ├── api-client.ts      # Advanced API client
│   │   ├── api-types.ts       # TypeScript types
│   │   └── api-loading-context.tsx
│   ├── hooks/                 # Custom React hooks
│   │   └── use-api.ts         # API hooks
│   └── Dockerfile            # Client container
├── microservices/            # Go Backend Services
│   ├── api-gateway/          # API Gateway (Port 8000)
│   ├── auth-service/         # Authentication (Port 8070)
│   ├── product-service/      # Products (Port 8080)
│   ├── order-service/        # Orders (Port 8081)
│   ├── inventory-service/    # Inventory (Port 8082)
│   ├── notification-service/ # Notifications (Port 8083)
│   ├── payment-service/      # Payments (Port 8084)
│   ├── customer-service/     # Customers (Port 8085)
│   ├── admin-service/        # Admin (Port 8086)
│   ├── cart-service/         # Shopping Cart (Port 8087)
│   ├── review-rating-service/ # Reviews (Port 8088)
│   ├── search-service/       # Search (Port 8089)
│   ├── logistics-service/    # Logistics (Port 8090)
│   ├── promotion-service/    # Promotions (Port 8091)
│   ├── nginx/                # Reverse proxy config
│   ├── docker-compose.yml    # Service orchestration
│   └── healthcheck.sh        # Health monitoring
└── postman/                  # API test collections

🚀 Quick Start

Prerequisites

Docker & Docker Compose
Node.js 20+ (for local frontend development)
Go 1.21+ (for local backend development)

Run Full Stack

# Clone repository
git clone <repository-url>
cd Go-Microservices

# Start all services (backend + frontend + nginx)
cd microservices
docker-compose up --build

# Services will be available at:
# - Frontend: http://localhost:3000 (via nginx: http://localhost)
# - API Gateway: http://localhost:8000 (via nginx: http://localhost/api)
# - Nginx Proxy: http://localhost:80
# - Prometheus: http://localhost:9090
# - Grafana: http://localhost:1707

Development Mode

Backend Only:

cd microservices
docker-compose up api-gateway product-service order-service

Frontend Only:

cd client
npm install
npm run dev
# Frontend at http://localhost:3000

Health Check

cd microservices
./healthcheck.sh

# Or check services manually
docker-compose ps

🎯 Architecture

Microservices Overview

Service	Port	Description
nginx	80/443	Reverse proxy, load balancing
Next.js Client	3000	Frontend application
API Gateway	8000	Single entry point, routing
Auth Service	8070	Authentication, JWT tokens
Product Service	8080	Product management
Order Service	8081	Order processing, caching
Inventory Service	8082	Stock management
Notification Service	8083	Email/SMS notifications
Payment Service	8084	Payment processing
Customer Service	8085	Customer profiles
Admin Service	8086	Admin operations
Cart Service	8087	Shopping cart
Review Service	8088	Product reviews
Search Service	8089	Product search
Logistics Service	8090	Shipping, tracking
Promotion Service	8091	Discounts, coupons

Communication Flow

User → Nginx → Next.js Client
              ↓
User → Nginx → API Gateway → Microservices
                             ↓
                      PostgreSQL / Redis / RabbitMQ

🔧 Frontend Features

Advanced API Client

Located at: client/lib/api-client.ts

Features:

Exponential Backoff Retry - 1s → 2s → 4s → 8s on failure
Automatic Token Refresh - Seamless re-authentication on 401
Response Caching - In-memory cache with configurable TTL
Request Cancellation - AbortController support
Loading States - React Context for global loading management
TypeScript - Full type safety

Example usage:

import  { apiClient } from '@/lib/api-client';

// Products (cached for 30s)
const products = await apiClient.products.list();

// Orders
const order = await apiClient.orders.create({ productId, quantity });

// Cart
await apiClient.cart.addItem(productId, 1);

// With React hooks
import { useApi } from '@/hooks/use-api';

const { data, loading, error } = useApi(
  () => apiClient.products.list(),
  { immediate: true }
);

Authentication

User Types:

Customers - /login
Admins - /admin/auth/login
Vendors - /vendor/auth/login

Features:

JWT token-based authentication
HTTP-only cookies
Automatic token refresh
Role-based access control

🛠️ Backend Features

Order Service

Caching with Redis:

30-minute TTL for orders
Automatic cache invalidation
Cache-aside pattern

Message Queue:

RabbitMQ for async processing
Event publishing for new orders
Topic exchange pattern

Batch Processing:

Parallel order processing
Configurable worker pool (10 workers)
Timeout handling (30s)
Performance: 1000+ orders/minute

Circuit Breaker

Fault tolerance for service calls
Automatic retry mechanism
Graceful degradation

🔒 Security

Frontend

XSS protection
CSRF prevention
Rate limiting via nginx

Backend

JWT authentication
Database isolation
Input validation
Secure password hashing

Infrastructure

Security headers (nginx)
Container scanning (Trivy)
Code scanning (gosec)
Dependency updates

📊 Monitoring

Prometheus Metrics

Request/response times
Error rates
Cache hit/miss ratios
DB query performance
Queue depth

Grafana Dashboards

Service health
Business KPIs
Resource utilization
Custom alerts

Access: http://localhost:1707 (admin/admin)

🧪 Testing

Unit Tests

cd microservices/order-service
make test-unit

Integration Tests

make test-integration

Coverage Report

make test-coverage

API Testing

Import Postman collections from postman/ directory

📖 API Documentation

Swagger UI

Each service provides interactive API documentation:

API Gateway: http://localhost:8000/swagger/index.html
Auth Service: http://localhost:8070/swagger/index.html
Product Service: http://localhost:8080/swagger/index.html
Order Service: http://localhost:8081/swagger/index.html
Cart Service: http://localhost:8087/swagger/index.html

Generate docs:

cd <service-directory>
swag init -g main.go -o docs

🌐 Production Deployment

Docker Health Checks

All services include health checks:

healthcheck:
  test: ["CMD", "wget", "--spider", "http://localhost:8000/health"]
  interval: 30s
  timeout: 10s
  retries: 3
  start_period: 40s

Nginx Configuration

Features:

Rate limiting
Gzip compression
Static asset caching (30 days)
WebSocket support
Security headers

SSL/TLS (Production): Uncomment HTTPS configuration in nginx/nginx.conf and add certificates to nginx/certs/

Environment Variables

Create .env file in microservices/:

JWT_SECRET=your-secret-key
STRIPE_SECRET_KEY=your-stripe-key

Frontend .env.local:

API_URL=http://localhost:8000
NEXT_PUBLIC_API_DEBUG=false

🔄 CI/CD Pipeline

GitHub Actions Workflow

Stages:

Test - Unit + integration tests
Security Scan - Trivy + gosec
Build - Docker images
Deploy - Kubernetes (on main branch)

Setup:

# Configure secrets in GitHub:
Settings → Secrets → Actions
- KUBE_CONFIG: Base64 kubeconfig

Triggers:

Push to main
Pull requests to main

🤝 Contributing

Fork the repository
Create feature branch (git checkout -b feature/amazing-feature)
Commit changes (git commit -m 'feat: Add amazing feature')
Push to branch (git push origin feature/amazing-feature)
Open Pull Request

Guidelines:

Follow Conventional Commits
Write tests for new features
Update documentation
Ensure CI passes

📝 Environment Setup

Backend Development

cd microservices/<service-name>
go mod download
go run main.go

Frontend Development

cd client
npm install
npm run dev

Database Migrations

# Run migrations
docker-compose exec <service> ./migrate up

# Rollback
docker-compose exec <service> ./migrate down

🐛 Troubleshooting

Services Won't Start

# Check logs
docker-compose logs api-gateway

# Check health
docker-compose ps
./healthcheck.sh

Frontend Can't Connect to Backend

Verify API Gateway is running
Check client/.env.local configuration
Ensure ports 3000 and 8000 are not in use

Database Connection Issues

Wait for health checks to pass (40s start period)
Check database logs: docker-compose logs product-db
Verify database credentials in docker-compose.yml

📚 Additional Documentation

📄 License

MIT License - see LICENSE file for details

🙏 Acknowledgments

Go community
Next.js team
Docker
All open source contributors

Built with ❤️ using Go and Next.js

Name		Name	Last commit message	Last commit date
Latest commit History 72 Commits
.github/workflows		.github/workflows
bank		bank
client		client
microservices		microservices
postman		postman
.gitignore		.gitignore
.gitlab-ci.yml		.gitlab-ci.yml
GITLAB_CI.md		GITLAB_CI.md
README.md		README.md
docker-compose.yml		docker-compose.yml

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Microservices E-Commerce Platform

🌟 Project Highlights

Key Features

Tech Stack

Performance

Security

📁 Project Structure

🚀 Quick Start

Prerequisites

Run Full Stack

Development Mode

Health Check

🎯 Architecture

Microservices Overview

Communication Flow

🔧 Frontend Features

Advanced API Client

Authentication

🛠️ Backend Features

Order Service

Circuit Breaker

🔒 Security

Frontend

Backend

Infrastructure

📊 Monitoring

Prometheus Metrics

Grafana Dashboards

🧪 Testing

Unit Tests

Integration Tests

Coverage Report

API Testing

📖 API Documentation

Swagger UI

🌐 Production Deployment

Docker Health Checks

Nginx Configuration

Environment Variables

🔄 CI/CD Pipeline

GitHub Actions Workflow

🤝 Contributing

📝 Environment Setup

Backend Development

Frontend Development

Database Migrations

🐛 Troubleshooting

Services Won't Start

Frontend Can't Connect to Backend

Database Connection Issues

📚 Additional Documentation

📄 License

🙏 Acknowledgments

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