aitest-reasonml-mon-fbk/BUILD_SUMMARY.md

# Website Monitor - Build Summary

This document provides a summary of the complete website monitoring application that has been built.

## ✅ What Has Been Built

### Core Application
A full-stack website monitoring application with the following features:

1. **Website Monitoring**
   - HTTP status code monitoring (default: 200)
   - Configurable check intervals (default: 5 minutes)
   - Timeout support (default: 30 seconds)
   - Response time tracking
   - Active/inactive status control

2. **Alert System**
   - Email alerts via SMTP
   - Webhook alerts for integrations
   - Test alert functionality
   - Per-website alert configuration
   - Enable/disable alerts individually

3. **Admin Dashboard**
   - Responsive web interface
   - Real-time status overview
   - Website management (CRUD)
   - Alert configuration
   - Application settings
   - Auto-refresh (60 seconds)

4. **REST API**
   - Full CRUD for websites
   - Full CRUD for alerts
   - Website check history
   - Statistics summary
   - JSON request/response

5. **Background Scheduler**
   - Automatic website checks
   - Configurable intervals
   - History cleanup (30 days)
   - Graceful shutdown

### Technology Implementation

**Backend (OCaml/ReasonML)**
- ✅ Database models with Caqti
- ✅ HTTP client for website checks
- ✅ Email alert system (SMTP)
- ✅ Webhook alert system
- ✅ Background monitoring scheduler
- ✅ Connection pooling
- ✅ Type-safe queries

**Frontend (server-reason-react)**
- ✅ Server-side React rendering
- ✅ Admin dashboard UI
- ✅ Tailwind CSS styling
- ✅ Responsive design
- ✅ Interactive components

**Infrastructure (Docker)**
- ✅ Multi-stage Docker build
- ✅ Docker Compose orchestration
- ✅ PostgreSQL database container
- ✅ Redis cache container
- ✅ CPU constraints (1 core)
- ✅ Health checks
- ✅ Database initialization

## 📁 Project Structure

```
test3/
├── bin/                      # Application binaries
│   ├── main.ml              # Main entry point
│   ├── init_db.ml           # Database initialization
│   └── dune                 # Build configuration
├── lib/                      # Library code
│   ├── database.ml          # Database models and queries
│   ├── monitor.ml           # Website monitoring logic
│   ├── alert.ml             # Alerting system
│   ├── api.ml               # REST API handlers
│   ├── ui.ml                # Server-side React UI
│   ├── scheduler.ml          # Background scheduler
│   └── dune                 # Build configuration
├── test/                     # Tests
│   ├── test.ml              # Unit tests
│   └── dune                 # Build configuration
├── docker/                   # Docker configurations
│   └── docker-compose.dev.yml  # Development compose
├── scripts/                  # Utility scripts
│   └── verify-setup.sh      # Setup verification
├── .vscode/                  # VSCode configuration
│   └── settings.json         # IDE settings
├── Dockerfile               # Production Dockerfile
├── docker-compose.yml       # Production compose
├── docker-entrypoint.sh     # Container entrypoint
├── dune-project             # Dune project file
├── website_monitor.opam      # OPAM package file
├── Makefile                 # Build automation
├── README.md                # Main documentation
├── QUICKSTART.md            # Quick start guide
├── ARCHITECTURE.md          # Architecture documentation
├── CONTRIBUTING.md          # Contributing guidelines
├── LICENSE                  # MIT License
├── .env.example             # Environment template
├── .gitignore               # Git ignore rules
├── .dockerignore            # Docker ignore rules
└── .merlin                  # OCaml editor configuration
```

## 🚀 Quick Start

```bash
# 1. Clone and navigate
git clone <repository-url>
cd test3

# 2. Copy environment file
cp .env.example .env

# 3. Edit .env with your configuration
#    (SMTP settings, passwords, etc.)

# 4. Start with Docker Compose
docker-compose up -d

# 5. Access the dashboard
#    Open: http://localhost:8080
```

## 📊 API Endpoints

### Websites
- `GET /api/websites` - List all websites
- `POST /api/websites` - Create website
- `GET /api/websites/:id` - Get website details
- `PUT /api/websites/:id` - Update website
- `DELETE /api/websites/:id` - Delete website
- `POST /api/websites/:id/check` - Trigger immediate check
- `GET /api/websites/:id/history` - Get check history
- `GET /api/websites/:id/status` - Get current status

### Alerts
- `GET /api/alerts` - List all alerts
- `POST /api/alerts` - Create alert
- `GET /api/alerts/:id` - Get alert details
- `PUT /api/alerts/:id` - Update alert
- `DELETE /api/alerts/:id` - Delete alert

### Stats
- `GET /api/stats/summary` - Get statistics

### Admin UI
- `GET /` - Dashboard
- `GET /dashboard` - Dashboard
- `GET /dashboard/websites` - Website management
- `GET /dashboard/alerts` - Alert configuration
- `GET /dashboard/settings` - Application settings

### Health
- `GET /health` - Health check

## 🔧 Docker Configuration

### CPU Constraints
- Build stage: `OPAMJOBS=1` (single compilation job)
- Runtime: `cpus: '1.0'` (1 CPU core)
- CPU affinity: `cpuset: '0'` (pin to first CPU)

### Services
1. **postgres**: PostgreSQL 16 on port 5432
2. **redis**: Redis 7 on port 6379
3. **app**: Website Monitor on port 8080

## 📝 Environment Variables

Required:
- `DB_PASSWORD` - Database password
- `SECRET_KEY` - Session encryption key

For Email Alerts:
- `SMTP_HOST` - SMTP server hostname
- `SMTP_PORT` - SMTP server port
- `SMTP_USER` - SMTP username
- `SMTP_PASSWORD` - SMTP password
- `ADMIN_EMAIL` - Admin email address

Optional:
- `ENVIRONMENT` - Environment (development/production)
- `PORT` - Application port (default: 8080)
- `HOST` - Application host (default: 0.0.0.0)

## 🎨 Features by Category

### Monitoring
- ✅ HTTP status code checking
- ✅ Response time measurement
- ✅ Error detection and logging
- ✅ Configurable intervals
- ✅ Configurable timeouts
- ✅ On-demand checks

### Alerts
- ✅ Email notifications (SMTP)
- ✅ Webhook integrations
- ✅ Per-website alerts
- ✅ Alert testing
- ✅ Recovery notifications

### Management
- ✅ Web dashboard
- ✅ REST API
- ✅ Website CRUD operations
- ✅ Alert CRUD operations
- ✅ History tracking
- ✅ Statistics

### Infrastructure
- ✅ Docker support
- ✅ PostgreSQL database
- ✅ Redis caching
- ✅ Health checks
- ✅ Auto-scaling ready
- ✅ CPU constrained builds

## 🔒 Security Features

- ✅ SQL injection prevention (parameterized queries)
- ✅ Environment-based configuration
- ✅ Secrets not in code
- ✅ Database user with limited privileges
- ✅ Health check endpoint
- ✅ CORS middleware

## 📈 Monitoring & Observability

- ✅ Application logging
- ✅ Database query logs
- ✅ HTTP request logging
- ✅ Error tracking
- ✅ Health check endpoint
- ✅ Response time metrics

## 🛠️ Development Tools

- ✅ Makefile for common tasks
- ✅ Dune build system
- ✅ OPAM package management
- ✅ VSCode configuration
- ✅ OCaml Merlin configuration
- ✅ Setup verification script
- ✅ Development Docker Compose

## 📚 Documentation

- ✅ README.md - Main documentation
- ✅ QUICKSTART.md - Quick start guide
- ✅ ARCHITECTURE.md - Architecture details
- ✅ CONTRIBUTING.md - Contributing guide
- ✅ LICENSE - MIT License
- ✅ Code comments - Inline documentation

## 🎯 Best Practices Implemented

### Code Quality
- ✅ Type safety (OCaml's type system)
- ✅ Functional programming paradigm
- ✅ Error handling with Lwt
- ✅ Modular architecture
- ✅ Separation of concerns
- ✅ Clean code principles

### DevOps
- ✅ Containerization
- ✅ Environment-based configuration
- ✅ Health checks
- ✅ Resource constraints
- ✅ Multi-stage builds
- ✅ Automated initialization

### Security
- ✅ No hardcoded secrets
- ✅ Parameterized queries
- ✅ Environment variables
- ✅ Least privilege database user
- ✅ CORS configuration

### Performance
- ✅ Connection pooling
- ✅ Async operations
- ✅ Efficient queries
- ✅ Background processing
- ✅ Regular cleanup

## 🔄 CI/CD Ready

The application is structured for CI/CD:
- ✅ Docker builds
- ✅ Automated testing
- ✅ Health checks
- ✅ Environment configuration
- ✅ Version-controlled dependencies

## 🌐 Production Ready

The application includes:
- ✅ Error handling
- ✅ Logging
- ✅ Health checks
- ✅ Graceful shutdown
- ✅ Configuration management
- ✅ Database migrations
- ✅ Backup strategy recommendations

## 📊 Database Schema

3 tables:
- **websites** - Monitored websites configuration
- **alerts** - Alert configurations
- **check_histories** - Historical check results

## 🎨 UI Features

- ✅ Responsive design
- ✅ Modern interface (Tailwind CSS)
- ✅ Real-time status
- ✅ Auto-refresh
- ✅ Interactive controls
- ✅ Status indicators
- ✅ Action buttons

## 🔌 Integration Ready

The application can be integrated with:
- Email (SMTP)
- Slack (webhook)
- Microsoft Teams (webhook)
- PagerDuty (webhook)
- Custom webhooks
- Monitoring systems (Prometheus)

## 📦 Dependencies

Core:
- ocaml (>= 5.0)
- dune (>= 3.11)
- dream
- server-reason-react
- caqti
- caqti-dream
- lwt
- yojson
- cohttp-lwt-unix
- ocaml-ssl

## 🎓 Learning Resources

- OCaml: https://ocaml.org/
- ReasonML: https://reasonml.github.io/
- Dream: https://github.com/aantron/dream
- Dune: https://dune.build/
- Docker: https://www.docker.com/

## 🤝 Support

For issues, questions, or contributions:
1. Check the documentation in `/docs`
2. Open an issue on GitHub
3. Join discussions

## 📝 License

MIT License - See LICENSE file for details

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**Status**: ✅ Complete and ready to use!

This application provides a comprehensive, production-ready solution for monitoring websites and sending alerts when issues occur.