This module is a part of the Martix application responsible for managing customer orders. It integrates with other services (e.g., Product, User, Auth) and ensures scalability, maintainability, and security.
This project is a high-performance, microservices-based order processing system designed to handle payments, order management, and fulfillment with low latency and scalability.
Built with GoLang, it leverages high-performance tools and best practices for fault tolerance, security, and scalability.
✅ Microservices Architecture: Each component (Payments, Orders, Fulfillment) runs independently for scalability.
✅ High-Performance API: Uses Gin for optimized request handling.
✅ Structured Logging: Zap ensures efficient logging with minimal overhead.
✅ Event-Driven Order Processing: Ensures asynchronous and real-time updates using messaging queues.
✅ Security First: OAuth2/JWT authentication with rate-limiting for protection.
✅ Resilient & Fault-Tolerant: Implements retries, circuit breakers, and distributed transactions.
✅ Database Consistency: Uses PostgreSQL/CockroachDB for ACID compliance and strong consistency.
The system uses a hybrid approach combining gRPC, messaging queues, and REST APIs for efficient inter-service communication.
- REST APIs: Public-facing APIs for customer interactions (e.g., placing orders, checking payment status).
- GraphQL (Optional): Provides a single endpoint for querying multiple services efficiently.
- gRPC: Used for high-speed, synchronous communication between critical services (e.g., Payment ↔ Order).
- Message Queue (Kafka/RabbitMQ): Asynchronous processing for event-driven workflows:
- Order Events: Order creation, status updates, inventory updates.
- Payment Events: Payment success/failure, refunds.
- Notification Events: Triggering emails, SMS updates.
- Event Sourcing: Ensures order state consistency in a distributed matrix system.
- CQRS (Command Query Responsibility Segregation):
- Write Operations → Handled by services with event logs.
- Read Operations → Optimized using materialized views.
- Database: PostgreSQL/CockroachDB (Ensures consistency, high availability).
1️⃣ Customer places an order → Order Service validates request.
2️⃣ Payment Service processes the transaction → Communicates via gRPC.
3️⃣ Order Service updates order status → Publishes event to Kafka/RabbitMQ.
4️⃣ Fulfillment Service processes shipping → Listens to order events asynchronously.
5️⃣ Notification Service sends order confirmation via event-driven messaging.
- Authentication & Authorization: OAuth2/JWT for user authentication.
- Rate Limiting & DDoS Protection: API Gateway limits abusive requests.
- Retry Mechanism & Circuit Breakers: Ensures system stability under failures.
- Database Transactions: ACID compliance to avoid race conditions.
- Horizontal Scaling: Microservices auto-scale independently.
- Load Balancing: Uses NGINX or Envoy Proxy for traffic management.
- Caching: Redis used for frequently accessed data (e.g., order history).
1️⃣ Low Latency - gRPC ensures fast, binary communication.
2️⃣ High Availability - Event-driven messaging reduces bottlenecks.
3️⃣ Scalability - Stateless services scale horizontally.
4️⃣ Data Integrity - Event Sourcing + CQRS maintains order consistency.
A list of high-performance tools used in GoLang for efficient logging, routing, server handling, and dependency injection.
| Tool | Company | Purpose | Repository |
|---|---|---|---|
| gin | Fast, easy to use, middleware support | gin | |
| Zap | Uber | High-performance logging | zap |
| FX | Uber | Dependency injection | fx |
| pgx | Fastest PostgreSQL driver in Go. | ||
| Watermill | Kafka/NATS support. | watermill | |
| golang-jwt | OAuth2/JWT Authentication. | ||
| API Gateway & Rate Limiting. | toolboth The Anatomy of an API Gateway in Golang | ||
| Retries, Circuit Breakers, Fault Tolerance. | Writing a circuit breaker in Go | ||
| Distributed Transactions (SAGA Pattern) | https://github.com/itimofeev/go-saga, https://www.codingexplorations.com/blog/implementing-the-saga-pattern-in-go-a-practical-guide , https://dev.to/yedf2/how-to-implement-saga-pattern-in-microservices-2gj3 |
- Order CRUD: Create, retrieve, and manage orders.
- Pagination: Efficient handling of large datasets.
- Messaging: Event-driven architecture with RabbitMQ.
- Authentication: Secure APIs with JWT.
- Database Integration: PostgreSQL with connection pooling and migrations.
📁 order-service/
├── 📁 cmd/
│ └── 📄 main.go # Application entry point
├── 📁 config/
│ ├── 📄 config.go # Configuration structs
│ ├── 📄 mongodb.go # MongoDB setup
│ └── 📄 rabbitmq.go # RabbitMQ setup
├── 📁 internal/
│ ├── 📁 bootstrap/
│ │ └── 📄 app.go # Application bootstrapper
│ ├── 📁 usecase/
│ │ └── 📄 order.go # Order business logic
│ ├── 📁 entity/
│ │ ├── 📄 order.go # Core order entity
│ │ ├── 📄 order_item.go # Order items
│ │ ├── 📄 invoice.go # Invoice generation
│ │ ├── 📄 shipping.go # Shipping details
│ │ ├── 📄 payment.go # Payment information
│ │ └── 📄 notification.go # Notification templates
│ ├── 📁 repository/
│ │ └── 📁 mongodb/
│ │ ├── 📄 order_repo.go
│ │ ├── 📄 invoice_repo.go
│ │ ├── 📄 shipping_repo.go
│ │ └── 📄 payment_repo.go
│ ├── 📁 delivery/ # Communication layers
│ │ ├── 📁 http/ # REST API
│ │ │ ├── 📁 middleware/
│ │ │ │ ├── 📄 auth.go # JWT authentication
│ │ │ │ └── 📄 logger.go # Request logging
│ │ │ ├── 📁 controller/
│ │ │ │ └── 📄 order.go # Order HTTP handlers
│ │ │ └── 📁 route/
│ │ │ └── 📄 route.go # HTTP routes
│ │ ├── 📁 grpc/ # gRPC service
│ │ └── 📁 message/ # Message queue handlers
│ │ ├── 📁 consumer/ # Incoming messages
│ │ │ ├── 📄 payment_events.go # Payment processing
│ │ │ ├── 📄 inventory_events.go # Stock updates
│ │ │ ├── 📄 shipping_events.go # Delivery updates
│ │ │ └── 📄 notification_events.go
│ │ └── 📁 publisher/ # Outgoing messages
│ │ ├── 📄 order_created.go
│ │ ├── 📄 order_updated.go
│ │ └── 📄 order_cancelled.go
│ └── 📁 service/ # Domain services
│ ├── 📄 pricing.go # Price calculations
│ ├── 📄 tax.go # Tax calculations
│ ├── 📄 discount.go # Discount rules
│ └── 📄 fraud.go # Fraud detection
├── 📁 pkg/
│ ├── 📁 utils/
│ │ ├── 📄 logger.go # Logging utility
│ │ └── 📄 validator.go # Input validation
│ └── 📁 messaging/
│ └── 📄 rabbitmq.go # RabbitMQ helper functions
├── 📄 Dockerfile # Service container definition
├── 📄 docker-compose.yml # Multi-container setup
├── 📄 .env # Environment variables
├── 📄 .env.example # Environment template
├── 📄 Makefile # Build automation
└── 📄 README.md # Project documentation
go get -u \
github.com/jackc/pgx/v5 \
github.com/gin-gonic/gin \
go.uber.org/zap \
go.uber.org/fx \
github.com/ThreeDotsLabs/watermill \
github.com/golang-jwt/jwt/v4go mod tidy # Cleans up the go.mod and go.sum files by adding missing dependencies and removing unused ones
go get go.mongodb.org/mongo-driver/mongo