🚀 Flowfull Go Starter Kit

A production-ready Go backend starter template built with Fiber, GORM, and the Flowfull/Flowless ecosystem. This starter kit implements all 7 core concepts of Flowfull architecture.

✨ Features

• 🔐 Bridge Validation - Distributed session validation with Flowless
• 🛡️ Validation Modes - Layered security (DISABLED, STANDARD, ADVANCED, STRICT)
• ⚡ HybridCache - 3-tier caching (Ristretto → Redis → Database)
• 🔑 Trust Tokens - PASETO v4 tokens for secure authentication
• 🎯 Auth Middleware - Flexible route protection (RequireAuth, OptionalAuth, RequireUserType)
• 💾 Multi-Database - Support for PostgreSQL, MySQL, and SQLite
• ⚙️ Environment Config - Validated configuration with Viper

📦 Tech Stack

• Web Framework: Fiber v2 - Fast HTTP framework
• ORM: GORM - Multi-database ORM
• Cache: Ristretto + Redis
• Config: Viper - Configuration management
• Logging: Zap - Structured logging
• Tokens: PASETO - Secure tokens
• Validation: validator

🏗️ Project Structure

flowfull-go-starter/
├── cmd/
│   └── server/
│       └── main.go              # Application entry point
├── internal/
│   ├── config/
│   │   └── environment.go       # Configuration with Viper
│   ├── lib/
│   │   ├── auth/
│   │   │   ├── bridge_validator.go    # Bridge Validation
│   │   │   ├── middleware.go          # Auth Middleware
│   │   │   ├── validation_mode.go     # Validation Modes
│   │   │   └── types.go               # Auth types
│   │   ├── cache/
│   │   │   └── hybrid_cache.go        # HybridCache implementation
│   │   ├── database/
│   │   │   └── connection.go          # Database connection
│   │   ├── tokens/
│   │   │   └── trust_tokens.go        # PASETO tokens
│   │   └── utils/
│   │       └── logger.go              # Zap logger
│   ├── models/
│   │   └── task.go              # Example GORM model
│   └── routes/
│       ├── health.go            # Health check routes
│       └── api.go               # API routes
├── scripts/
│   └── generate_paseto_key.go   # Generate PASETO keys
├── .env.example                 # Environment variables template
├── .gitignore
├── .air.toml                    # Live reload config
├── go.mod
├── Makefile
└── README.md

🚀 Quick Start

Prerequisites

• Go 1.22+ - Download
• PostgreSQL/MySQL/SQLite - Choose your database
• Redis (optional but recommended)

1. Clone and Setup

# Clone the repository
git clone https://github.com/yourusername/flowfull-go-starter.git
cd flowfull-go-starter

# Install dependencies
make install

# Copy environment file
cp .env.example .env

2. Configure Environment

Edit .env with your settings:

# Server
PORT=3001
ENVIRONMENT=development

# Database
DATABASE_URL=postgresql://user:pass@localhost:5432/mydb

# Flowless Integration
FLOWLESS_API_URL=http://localhost:3000
BRIDGE_VALIDATION_SECRET=your-secret-key-min-32-chars

# Redis (optional)
REDIS_URL=redis://localhost:6379

# Auth Validation Mode
AUTH_VALIDATION_MODE=STANDARD  # DISABLED | STANDARD | ADVANCED | STRICT

3. Generate PASETO Key (Optional)

make generate-key
# Copy the generated private key to .env

4. Run Development Server

# With live reload
make dev

# Or without live reload
make build
make run

The server will start at http://localhost:3001

📚 API Endpoints

Health Checks

GET /health          # Basic health check
GET /health/db       # Database health
GET /health/cache    # Cache health
GET /health/all      # Complete health check

Public Routes

GET /                # Service info
GET /api/public      # Public endpoint (no auth)

Protected Routes (Require Authentication)

GET /api/protected   # Protected endpoint
GET /api/profile     # User profile
GET /api/tasks       # List user tasks
POST /api/tasks      # Create task
GET /api/tasks/:id   # Get task
PUT /api/tasks/:id   # Update task
DELETE /api/tasks/:id # Delete task

Optional Auth Routes

GET /api/optional    # Works with or without auth

🔐 Authentication

This starter uses Bridge Validation with Flowless for authentication.

How it works:

1. User authenticates with Flowless
2. Flowless generates a session_id
3. Frontend sends session_id in header: X-Session-Id
4. Backend validates with Flowless via Bridge Validation
5. Session is cached in HybridCache (Ristretto + Redis)
6. Subsequent requests use cached session (sub-millisecond latency)

Example Request:

curl -H "X-Session-Id: your-session-id" \
     http://localhost:3001/api/protected

🛡️ Validation Modes

Configure security level in .env:

AUTH_VALIDATION_MODE=STANDARD

Mode	IP Check	User-Agent	Device ID	Use Case
DISABLED	❌	❌	❌	Development only
STANDARD	✅	❌	❌	Basic security
ADVANCED	✅	✅	❌	Recommended
STRICT	✅	✅	✅	High security

⚡ Performance

• Cache Hit Rate: >95% (Ristretto + Redis)
• Auth Latency (cached): <1ms (Ristretto)
• Auth Latency (Redis): <5ms
• Auth Latency (Bridge): <50ms
• Throughput: >50k req/s with cache

🧪 Testing

# Run tests
make test

# Run tests with coverage
make test-coverage

# Run linter
make lint

# Format code
make fmt

📦 Available Commands

make help           # Show all commands
make install        # Install dependencies
make dev            # Run with live reload
make build          # Build binary
make run            # Run binary
make test           # Run tests
make lint           # Run linter
make clean          # Clean artifacts
make generate-key   # Generate PASETO key

🐳 Docker Support

# Build image
make docker-build

# Run with docker-compose
make docker-up

# Stop
make docker-down

📖 Documentation

For detailed documentation, see the /docs folder or visit:

• Architecture Overview
• Core Concepts
• Deployment Guide

🤝 Contributing

Contributions are welcome! Please read CONTRIBUTING.md for details.

📄 License

MIT License - see LICENSE for details.

🙏 Acknowledgments

Built with the Flowfull/Flowless ecosystem.

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Made with ❤️ by the Pubflow Team