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Scalable Chat Application

This repository outlines the architecture for a scalable chat application using multiple WebSocket servers with a Publish-Subscribe (Pub-Sub) model. This design allows multiple users to connect to different WebSocket servers and subscribe to the same room, ensuring seamless message delivery across the network.

Technology Stack

  • Node.js: JavaScript runtime environment.
  • TypeScript: Superset of JavaScript with static typing.
  • Redis: In-memory data structure store, used here for Pub-Sub messaging.

Architecture Overview

Key Components

  1. WebSocket Servers:

    • Handle client connections.
    • Manage subscriptions to rooms.
    • Publish messages to subscribed clients.

  2. Pub-Sub System:

    • Manages message distribution.
    • Propagates messages to all WebSocket servers with clients subscribed to the room.

  3. Rooms:

    • Virtual channels for group communication.
    • Broadcast messages to all subscribers.