Redux Cluster 2.0

A modern TypeScript library for synchronizing Redux stores across multiple processes and machines using TCP, Unix Domain Sockets, and IPC.

🌐 Need WebSocket support for browsers? Check out redux-cluster-ws - our companion package that extends Redux Cluster with WebSocket transport for browser clients.

🌟 Key Features

• 🔄 Real-time State Synchronization across multiple processes/machines
• 🌐 Multiple Transport Options: TCP, Unix Domain Sockets, IPC
• 🌍 WebSocket Support: Available via redux-cluster-ws
• 📡 Bidirectional Communication - any node can dispatch actions
• 🔒 Built-in Security with authentication and IP banning
• ⚡ High Performance with optimized networking and compression
• 🏗️ Master-Slave Architecture with automatic leader election
• 🔧 TypeScript First with comprehensive type definitions
• 🎯 Redux Compatible - works with existing Redux ecosystem

🏛️ Architecture Overview

Redux Cluster implements a master-slave architecture where one server manages the authoritative state and distributes updates to all connected clients:

┌─────────────────────────────────────────────────────────────────┐
│                        Redux Cluster Network                    │
├─────────────────────────────────────────────────────────────────┤
│                                                                 │
│  ┌─────────────┐         TCP/Socket          ┌─────────────┐    │
│  │   Client A  │◄───────────────────────────►│   Server    │    │
│  │  (Worker)   │                             │  (Master)   │    │
│  └─────────────┘                             │             │    │
│                                              │             │    │
│  ┌─────────────┐         TCP/Socket          │             │    │
│  │   Client B  │◄───────────────────────────►│             │    │
│  │  (Worker)   │                             │             │    │
│  └─────────────┘                             └─────────────┘    │
│                                                       │         │
│  ┌─────────────┐         TCP/Socket                   │         │
│  │   Client C  │◄─────────────────────────────────────┘         │
│  │  (Worker)   │                                                │
│  └─────────────┘                                                │
│                                                                 │
└─────────────────────────────────────────────────────────────────┘

Data Flow

┌─────────────┐    1. Action     ┌─────────────┐    2. Process   ┌─────────────┐
│   Client    │─────────────────►│   Server    │────────────────►│    Redux    │
│             │                  │  (Master)   │                 │   Store     │
└─────────────┘                  └─────────────┘                 └─────────────┘
       ▲                                │                               │
       │                                ▼                               │
       │         4. State Update  ┌─────────────┐    3. State Changed   │
       └──────────────────────────│  Broadcast  │◄──────────────────────┘
                                  │   Engine    │
                                  └─────────────┘
                                         │
                                         ▼
                              ┌─────────────────────┐
                              │    All Clients      │
                              │   (Auto-sync)       │
                              └─────────────────────┘

🚀 Quick Start

1. Installation

npm install redux-cluster redux

2. Basic TCP Example

Server (Master):

const { createStore } = require('redux-cluster');

// Simple counter reducer
const counterReducer = (state = { counter: 0 }, action) => {
  switch (action.type) {
    case 'INCREMENT': return { counter: state.counter + 1 };
    case 'DECREMENT': return { counter: state.counter - 1 };
    default: return state;
  }
};

// Create store and server
const store = createStore(counterReducer);
const server = store.createServer({ port: 8080 });

console.log('Server started on port 8080');

// Server can dispatch actions
store.dispatch({ type: 'INCREMENT' });

Client (Worker):

const { createStore } = require('redux-cluster');

const store = createStore(counterReducer);
const client = store.createClient({ 
  host: 'localhost', 
  port: 8080 
});

// Client receives all state updates automatically
store.subscribe(() => {
  console.log('New state:', store.getState());
});

// Client can also dispatch actions
store.dispatch({ type: 'INCREMENT' });

🌐 Transport Options

Redux Cluster supports multiple transport mechanisms:

TCP (Network)

// Server
const server = store.createServer({ 
  host: 'localhost',
  port: 8080 
});

// Client  
const client = store.createClient({ 
  host: 'localhost',
  port: 8080 
});

Unix Domain Sockets (Local)

// Server
const server = store.createServer({ 
  path: '/tmp/redux-cluster.sock' 
});

// Client
const client = store.createClient({ 
  path: '/tmp/redux-cluster.sock' 
});

IPC (Node.js Cluster)

import cluster from 'cluster';

if (cluster.isMaster) {
  const store = createStore(reducer);
  cluster.fork(); // Start worker
} else {
  const store = createStore(reducer);
  // IPC automatically enabled in cluster workers
}

🔧 Configuration Options

Server Configuration

const server = store.createServer({
  host: 'localhost',     // TCP host
  port: 8080,           // TCP port  
  path: '/tmp/app.sock', // Unix socket path
  logins: {             // Authentication
    'user1': 'password1',
    'user2': 'password2'
  }
});

Client Configuration

const client = store.createClient({
  host: 'localhost',     // TCP host
  port: 8080,           // TCP port
  path: '/tmp/app.sock', // Unix socket path
  login: 'user1',       // Authentication
  password: 'password1'
});

Store Configuration

const store = createStore(reducer, {
  mode: 'action',           // 'action' | 'snapshot'
  serializationMode: 'json', // 'json' | 'protoobject'
  debug: false,             // Enable debug logging
  resync: 30000            // Resync interval (ms)
});

📊 Synchronization Modes

Action Mode (Default)

Actions are distributed and replayed on all nodes:

Client A: dispatch(ACTION) ──► Server ──► broadcast(ACTION) ──► All Clients
                                  │
                                  ▼
                              Apply ACTION to master state

Snapshot Mode

Complete state snapshots are distributed:

Client A: dispatch(ACTION) ──► Server ──► calculate new state ──► broadcast(STATE) ──► All Clients

🔒 Security Features

Authentication

const server = store.createServer({
  logins: {
    'api-service': 'secret-key-123',
    'worker-pool': 'another-secret'
  }
});

const client = store.createClient({
  login: 'api-service',
  password: 'secret-key-123'
});

IP Banning

Automatic IP banning after failed authentication attempts:

• 5+ failed attempts = 3 hour ban
• Automatic cleanup of expired bans
• Configurable ban policies

🎮 Examples

See the examples/ directory for complete working examples:

• TCP Transport - Network communication
• File Socket - Local IPC via Unix sockets
• Basic Store - Local Redux store without networking

🌐 WebSocket Examples: For browser integration examples with WebSocket transport, visit the redux-cluster-ws examples.

Each example includes a README with step-by-step instructions.

📦 Related Packages

redux-cluster-ws

WebSocket transport layer for Redux Cluster, enabling browser client support:

npm install redux-cluster-ws

Features:

• 🌐 WebSocket server and client
• 🔗 Seamless integration with Redux Cluster
• 🖥️ Browser support for web applications
• 📱 Real-time state synchronization to browsers
• 🔒 Same security features as core package

Links:

• 📋 NPM Package
• 📖 Documentation
• 🎯 Examples

🧪 Testing

# Run all tests
npm test

# Run specific test suites
npm run test:unit       # Unit tests
npm run test:transport  # Transport integration tests

# Build and test
npm run build
npm run lint

# Run full integration tests (includes Docker)
npm run test:integration-full

📈 Performance

Redux Cluster is optimized for high-throughput scenarios:

• Compression: gzip compression for all network traffic
• Binary Protocol: Efficient binary serialization options
• Connection Pooling: Reuse connections where possible
• Minimal Overhead: < 1ms latency for local sockets

Benchmark results:

• TCP: ~10,000 actions/sec
• Unix Sockets: ~50,000 actions/sec
• IPC: ~100,000 actions/sec

🗺️ Roadmap

• Redis Transport - Redis pub/sub for clustering
• WebSocket Transport - Available in redux-cluster-ws
• Conflict Resolution - CRDT-based conflict resolution
• Persistence Layer - Automatic state persistence
• Monitoring Dashboard - Real-time cluster monitoring
• Load Balancing - Multiple master support

🤝 Contributing

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

Development Setup

git clone https://github.com/siarheidudko/redux-cluster.git
cd redux-cluster
npm install
npm run build
npm test

📄 License

MIT License - see LICENSE file for details.

🆘 Support

• 📝 Issues: GitHub Issues
• 💬 Discussions: GitHub Discussions
• 📧 Email: siarhei@dudko.dev

💝 Support This Project

If Redux Cluster helps you build amazing applications, consider supporting its development:

• ☕ Buy me a coffee
• 💳 PayPal
• 🎯 Patreon
• 🌐 More options

Your support helps maintain and improve Redux Cluster for the entire community!

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Made with ❤️ by Siarhei Dudko