Simple WebSocket Server with Redis Pub/Sub

This project implements a WebSocket server with Redis Pub/Sub functionality, allowing real-time communication across multiple server instances.

Key Features

1. Dual WebSocket Servers: Runs two WebSocket servers on ports 8080 and 8081.
2. Redis Integration: Uses Redis for pub/sub messaging between server instances.
3. Room-based Messaging: Supports subscribing to and sending messages within specific rooms.
4. Scalable Architecture: Designed to work across multiple server instances.

Code Structure

• Redis Setup:

  • Creates separate Redis clients for publishing and subscribing.
  • Implements a connectToRedis function for establishing connections.

• WebSocket Server Setup:

  • Creates two WebSocket servers using the ws library.
  • Implements a setupWebSocketServer function to handle WebSocket logic.

• Subscription Management:

  • Maintains a subscription object to track user connections and room subscriptions.
  • Generates unique IDs for each connection using genRandomNum.

• Message Handling:

  • Supports three types of messages: "SUBSCRIEB", "UNSUBSCRIEB", and "sendMessage".
  • Implements room subscription/unsubscription logic.
  • Uses Redis pub/sub for message broadcasting.

• Helper Functions:

  • oneUserSubscribedTo: Checks if a user is the first to subscribe to a room.
  • lastPersonLeftRoom: Checks if the last person has left a room.

This implementation provides a solid foundation for a scalable, real-time messaging system using WebSockets and Redis.