Chat

A websockets based, real-time chat app written in TypeScript.

• Includes creating and joining a room, a profanity filter, anti-spam, and the ability to use Markdown (i.e bold text, emojis, and links).
• Uses Socket.io for event-driven, bi-directional communication, with Redis pub/sub.
• Uses Redis queues for persisting the 10 most recent messages, and hashmaps for storing the rooms and users.
• Uses HAProxy for load balancing and SSL/HTTPS
• Due to Redis pub/sub and HAProxy horizontal scaling is possible by scaling up the number of Docker containers and adding them to the haproxy.cfg file.
• Uses Node and Express for the server.
• Deployed to AWS EC2 using Terraform, the GitHub Actions workflow builds the Docker image, pushes it, and then pulls it on the EC2 instance.