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.