🔄 CDC Stream

Real-time database change notifications - No Docker, No Kafka, Just Python!

CDC Stream captures database changes (INSERT, UPDATE, DELETE) and sends notifications to Slack, Email, Webhooks, or REST APIs.

✨ Features

• 🚀 Simple Setup: Just pip install and start
• 🐘 PostgreSQL Support: Native trigger-based CDC
• 📡 Multiple Notification Channels: Slack, Email, Webhook, REST API
• 🎯 Flexible Rules: Filter and route events based on conditions
• 🌐 Web UI: Beautiful dashboard for configuration
• 🐍 Pure Python: No Docker, Kafka, or external dependencies required

🚀 Quick Start

# Install
pip install cdc-stream

# Start (that's it!)
python -m cdc_stream start

# Open http://localhost:5858 in your browser

📦 Installation

From PyPI (Recommended)

pip install cdc-stream

From Source

git clone https://github.com/yourusername/cdc-stream.git
cd cdc-stream
pip install -e .

🎯 How It Works

┌─────────────────────────────────────────────────────────────┐
│                      Your Database                          │
│  ┌─────────────────────────────────────────────────────┐   │
│  │  INSERT/UPDATE/DELETE on your tables                │   │
│  └──────────────────────┬──────────────────────────────┘   │
│                         │ TRIGGER (auto-installed)         │
│                         ▼                                   │
│              pg_notify('cdc_stream_events')                │
└─────────────────────────┼───────────────────────────────────┘
                          │
                          ▼
┌─────────────────────────────────────────────────────────────┐
│                    CDC Stream Worker                        │
│  ┌─────────────────────────────────────────────────────┐   │
│  │  LISTEN → Filter → Rule Check → Send Notification   │   │
│  └─────────────────────────────────────────────────────┘   │
│         │              │              │              │      │
│         ▼              ▼              ▼              ▼      │
│     📧 Email      💬 Slack      🔗 Webhook     🌐 REST     │
└─────────────────────────────────────────────────────────────┘

🖥️ Web UI

Open http://localhost:5858 after starting CDC Stream:

1. Add Connection: Configure your PostgreSQL database
2. Create Alert: Select table, define filters, choose notification channel
3. Watch Live: Real-time event stream visualization

📋 CLI Commands

# Start everything (web UI + worker)
python -m cdc_stream start

# Start with custom port
python -m cdc_stream start --port 8080

# Start only web server
python -m cdc_stream webserver

# Start only worker
python -m cdc_stream worker

# Check status
python -m cdc_stream status

# Show version
python -m cdc_stream version

# Manage triggers
python -m cdc_stream triggers <datasource_id> list
python -m cdc_stream triggers <datasource_id> sync
python -m cdc_stream triggers <datasource_id> remove

# Test listener
python -m cdc_stream test-listener <datasource_id>

🔔 Notification Channels

Slack

{
  "webhook_url": "https://hooks.slack.com/services/..."
}

Email (SMTP)

{
  "smtp_host": "smtp.gmail.com",
  "smtp_port": 587,
  "smtp_user": "your@email.com",
  "smtp_password": "app-password",
  "from_email": "alerts@yourcompany.com",
  "to_emails": ["team@yourcompany.com"]
}

Webhook

{
  "url": "https://your-api.com/webhook",
  "method": "POST",
  "headers": {"Authorization": "Bearer token"}
}

REST API

{
  "method": "POST",
  "url": "https://api.example.com/events",
  "auth_type": "bearer",
  "auth_token": "your-token",
  "headers": {},
  "body": "{\"event\": \"{{data}}\"}"
}

🎯 Filter & Rule Examples

Filters (Pre-condition)

Only process events matching these conditions:

[
  {"field": "status", "operator": "==", "value": "active"},
  {"field": "amount", "operator": ">", "value": 1000}
]

Rules (Alert condition)

Send notification when these conditions are met:

[
  {"field": "priority", "operator": "==", "value": "critical"}
]

🔧 Configuration

Environment Variables

# Optional: Change default ports
CDC_STREAM_PORT=5858
CDC_STREAM_DB_PATH=./cdc_stream.db

Database Requirements

CDC Stream requires PostgreSQL 10+ with these settings (usually default):

-- Check your settings
SHOW wal_level;  -- Should work with any value

Note: Unlike traditional CDC tools, CDC Stream uses trigger-based capture which works without changing wal_level.

📊 System Requirements

• Python: 3.9+
• Database: PostgreSQL 10+
• RAM: ~50MB
• Disk: ~10MB

🔒 Security

• Credentials stored locally in SQLite
• No external services required
• All communication stays within your infrastructure

🐛 Troubleshooting

Worker not receiving events

1. Check if triggers are installed:

python -m cdc_stream triggers <datasource_id> list

2. Sync triggers with alerts:

python -m cdc_stream triggers <datasource_id> sync

Connection issues

1. Verify database is accessible
2. Check firewall settings
3. Ensure user has CREATE TRIGGER permission

📝 License

MIT License - see LICENSE file for details.

🤝 Contributing

Contributions are welcome! Please read our contributing guidelines first.

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