Implement Rate Limiting Middleware and Update Redis Integration

[saurabh-wednesday]

This PR introduces a new rate-limiting middleware to the FastAPI application and updates the Redis integration to be compatible with aioredis version 2.x. The rate-limiting middleware restricts the number of requests a client can make within a specified time window, enhancing the API's robustness against potential abuse or excessive traffic.

Changes

1. Rate Limiting Middleware:

   • Added a new RateLimitMiddleware class in middlewares/rate_limiter_middleware.py.
   • The middleware limits requests based on client IP and uses Redis to track request counts and enforce limits.
   • Clients exceeding the rate limit will receive a 429 Too Many Requests response.

2. Redis Integration Update:

   • Updated Redis client creation to use aioredis.from_url, aligning with aioredis version 2.x API changes.
   • Removed explicit connection pool closing, as aioredis v2.x handles connection pooling automatically.
   • Ensured proper decoding of Redis responses by setting decode_responses=True.

3. Configuration:

   • Redis URL and other configurations are managed via environment variables, allowing flexibility for different deployment environments.

Deployment Notes

• Ensure that the Redis server is accessible at the configured URL in production.
• Monitor the application logs for any unusual patterns or errors post-deployment.

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