• copy from: go-clean-template

Go Dev Kit template

Godev Kit template for Golang services

Contact

If you implement a new feature or need support running the project, please contact me!

• Email: [email protected]
• FB: https://www.facebook.com/phucducdev
• Linkedin: https://www.linkedin.com/in/phucducktpm/
• Or open an issue or pull request on GitHub.

Overview

GoDev Kit is a modular, production-ready template for building robust Golang microservices and backend applications. It provides a clean architecture foundation, best practices, and ready-to-use integrations for common infrastructure components, allowing you to focus on your business logic instead of boilerplate setup.

🆕 New Feature: Auto Payment System

The latest addition to GoDev Kit is a complete Auto Payment System for electric bills with:

• RESTful API: Register payments via HTTP endpoints
• Database Persistence: PostgreSQL for payment data storage
• Asynchronous Processing: Kafka-based payment processing
• Real-time Status: Payment status tracking and updates
• User Management: Payment history per user
• Swagger Documentation: Complete API documentation
• Production Ready: Error handling, logging, and monitoring

This demonstrates how to build a complete business feature following clean architecture principles with proper separation of concerns, database integration, message queuing, and comprehensive documentation.

Key Features

• Clean Architecture: Separation of concerns between controllers, use cases, repositories, and entities.
• Configurable: Centralized configuration via YAML and environment variables.
• Database Integration: Built-in support for PostgreSQL, Redis, and migration scripts.
• Kafka Integration: Easily produce and consume messages with built-in Kafka support.
• NATS Integration: Built-in support for NATS messaging for event-driven architectures.
• Redis Integration: Use Redis for caching or fast key-value storage with ready-to-use modules.
• User Login Module: Includes JWT-based authentication and user management out of the box.
• Payment System: Complete auto payment system for electric bills with Kafka processing.
• API Ready: HTTP and gRPC server templates, with Swagger/OpenAPI documentation.
• Observability: Prometheus metrics and structured logging out of the box.
• Extensible: Easily add new features, endpoints, or infrastructure components.
• Developer Experience: Makefile tasks, Docker support, and example code for rapid development.

Use Cases

• Rapidly bootstrap new Go microservices or backend APIs.
• Learn and apply best practices for scalable Go service design.
• Serve as a reference implementation for clean, maintainable Go codebases.

Table of Contents

• Quick Start
• Features
  • Configuration
    • Environment Variables
    • YAML Configuration
  • Prometheus Metrics
    • Enable/Disable Metrics
    • Configure Skip Paths
    • Example Output
  • Swagger Documentation
    • Installation
    • Generate Documentation
    • Access Swagger UI
    • Writing Annotations
    • Available Endpoints
    • Update Documentation
    • Swagger UI Features
  • Kafka Integration
  • Redis Integration
  • User Login Module
  • Payment System
    • Overview
    • Architecture
    • API Endpoints
    • Database Schema
    • Kafka Processing
    • Setup and Usage
  • VietQR Integration
• Project Structure
• API Documentation
• Development
  • Prerequisites
  • Building
  • Running
  • Testing
• Deployment
• NATS Integration
  • Running a NATS Server
  • Configuring NATS
  • NATS API Usage
• Contributing
• License

Content

Payment System

A complete auto payment system for electric bills with RESTful API, PostgreSQL database, Kafka processing, and Swagger documentation.

Key Features:

• ✅ Payment registration via HTTP API
• ✅ PostgreSQL database with migrations
• ✅ Kafka asynchronous processing
• ✅ Real-time status tracking
• ✅ User payment history
• ✅ Complete Swagger documentation

API Endpoints:

• POST /v1/payments - Register a new payment
• GET /v1/payments/{id} - Get payment by ID
• GET /v1/users/{user_id}/payments - Get user payment history

Quick Start:

# Run database migrations
make migrate-up

# Start application
go run cmd/app/main.go

# Access Swagger UI
http://localhost:10000/swagger/index.html

📖 Detailed Documentation:

• PAYMENT_SYSTEM.md - System architecture and overview
• PAYMENT_SETUP.md - Complete setup instructions
• SWAGGER_GUIDE.md - Swagger UI usage guide
• PAYMENT_SUMMARY.md - Implementation summary
• examples/payment_demo.go - Usage examples

Quick start

Feature

Config data:

• handle load env from yaml file.
  • config struct into file config/config.go
  • value yaml into file config/config.yaml

Prometheus Metrics:

1. On|off metrics

METRICS:
  ENABLED: true|false

2. Config bypass route api.

METRICS:
  ...
  SKIP_PATHS: "/swagger/*;/metrics"

• Remove some paths from metrics with sep ";"

prometheus.SetSkipPaths(strings.Split(cfg.Metrics.SetSkipPaths, ";"))

3. Code example: https://github.com/ansrivas/fiberprometheus
4. Output:

• access browser: http://127.0.0.1:8080/metrics

# HELP http_request_duration_seconds Duration of all HTTP requests by status code, method and path.
# TYPE http_request_duration_seconds histogram
http_request_duration_seconds_bucket{method="GET",path="/metrics",service="godev-kit",status_code="200",le="1e-09"} 0
http_request_duration_seconds_bucket{method="GET",path="/metrics",service="godev-kit",status_code="200",le="60"} 1
http_request_duration_seconds_bucket{method="GET",path="/metrics",service="godev-kit",status_code="200",le="+Inf"} 1
http_request_duration_seconds_sum{method="GET",path="/metrics",service="godev-kit",status_code="200"} 0.000803375
http_request_duration_seconds_count{method="GET",path="/metrics",service="godev-kit",status_code="200"} 1
# HELP http_requests_in_progress_total All the requests in progress
# TYPE http_requests_in_progress_total gauge
http_requests_in_progress_total{method="GET",service="godev-kit"} 1
# HELP http_requests_total Count all http requests by status code, method and path.
# TYPE http_requests_total counter
http_requests_total{method="GET",path="/metrics",service="godev-kit",status_code="200"} 1

Swagger

1. On|Off

SWAGGER:
  ENABLED: true|false

2. Installation

# Install Swagger CLI tool
go install github.com/swaggo/swag/cmd/swag@latest

# Verify installation
swag --version

3. Generate Documentation

# Generate or update Swagger docs (OpenAPI)
swag init -g internal/controller/http/router.go
# This will update docs/swagger.json, docs/swagger.yaml, and docs/docs.go

4. Access Swagger UI If enabled in your config, you can view the interactive API docs at:

http://localhost:8080/swagger/index.html

5. Writing Annotations

• Use swaggo/swag annotations in your handler functions for automatic doc generation.
• See existing handlers in internal/controller/http/v1/ for examples.

6. Update Documentation

• Re-run the swag init command after adding or changing API endpoints or annotations.

Available Endpoints

• All available endpoints are documented in the Swagger UI and OpenAPI files.
• New: GET /v1/redis/shipper/location/:shipper_id — Get the latest location of a shipper (cache-aside pattern).
• Payment System: Complete payment endpoints for electric bill processing:
  • POST /v1/payments — Register a new payment
  • GET /v1/payments/{id} — Get payment by ID
  • GET /v1/users/{user_id}/payments — Get payments by user ID

API Documentation

• The OpenAPI/Swagger spec is always available in docs/swagger.json and docs/swagger.yaml.
• To regenerate after code changes, run:

  swag init -g cmd/app/main.go

• For interactive docs, visit /swagger/index.html when running the service.
• Payment System Documentation: Complete Swagger documentation for payment endpoints is available at http://localhost:10000/swagger/index.html

Development

Prerequisites

• Go 1.20 or higher
• Docker (for local development)
• Make (for building and running)
• Git (for version control)

Building

# Build the application
make build

# Build the Docker image
make docker-build

Running

# Run the application locally
make run

# Run the application in Docker
make docker-run

Testing

# Run tests
make test

# Run tests with coverage
make test-coverage

Deployment

Prerequisites

• A Kubernetes cluster (e.g., Minikube, Kind, EKS, GKE)
• kubectl (for Kubernetes commands)
• Helm (for deploying with Helm charts)
• Docker (for building images)

Steps

1. Build and Push Images:

   # Build and push the application image
   make docker-build-push

2. Deploy to Kubernetes:

   # Create namespace (if not exists)
   kubectl create namespace godev-kit
   
   # Apply Helm chart
   helm install godev-kit ./helm/godev-kit

3. Expose Services:

   # Expose the application using Ingress or Service
   kubectl expose deployment godev-kit --type=LoadBalancer --port=80 --target-port=8080

4. Access the Application:

   # Get the external IP
   kubectl get svc godev-kit

NATS Integration

Running a NATS Server

# Start a NATS server locally
nats-server

Configuring NATS

NATS:
  URL: nats://localhost:4222
  CLUSTER:
    NAME: godev-kit
    PEERS:
      - nats://localhost:4223
      - nats://localhost:4224
  AUTH:
    USER: godev-kit
    PASSWORD: godev-kit

NATS API Usage

• The NATS server exposes a gRPC interface for managing JetStream streams and consumers.
• You can use the nats CLI tool or a gRPC client to interact with it.
• Example:

  # List streams
  nats stream ls
  
  # Create a stream
  nats stream add my_stream --subjects="my.subject" --storage=file --file="nats://localhost:4222/jetstream/my_stream"

Payment System Files

New Files Created: 14 files including core components, database migrations, and documentation
Modified Files: 5 existing files for integration
Total: ~2000+ lines of code

📁 File Structure: See PAYMENT_SUMMARY.md for complete file listing and implementation details.

Contributing

1. Fork the repository.
2. Create a new branch for your feature.
3. Make your changes and commit them.
4. Push to your branch.
5. Create a pull request.

License

This project is licensed under the MIT License - see the LICENSE file for details.