Distributed Rate Limiter (Go + Redis)

A high-performance, distributed rate limiter built in Go. It uses Redis Lua scripts to ensure atomicity and prevent race conditions in concurrent environments.

Key Features

• Distributed State: Uses Redis as the backend, allowing multiple API instances to share the same rate limits.
• Atomic Operations: Implements the "Fixed Window" algorithm via custom Lua scripts to guarantee thread safety.
• Concurrency Safe: Proven to handle concurrent requests without "leaking" excess traffic.
• Dockerized: Ready to run with a single command.

Tech Stack

• Language: Go (Golang)
• Database: Redis (Alpine)
• Containerization: Docker & Docker Compose
• Testing: Custom concurrent load generator

How to Run

1. Start Redis:

   docker-compose up -d

2. Run the Server:

   go run main.go

   Server will start on :8080.

3. Run the Load Test:

   go run load_test/attack.go

Performance Proof

Load test results simulating 20 concurrent requests (Limit: 5/10s):

🚀 Starting Load Test...
✅ Request 10: ALLOWED
✅ Request 9: ALLOWED
✅ Request 1: ALLOWED
✅ Request 6: ALLOWED
✅ Request 7: ALLOWED
⛔ Request 14: BLOCKED
... (All subsequent requests blocked)
Test finished in 19.69ms