def check_rate_limit(user_id: str, limit: int = 100, window: int = 60) -> bool:
    """
    Sliding window rate limiting with Redis.
    Returns True if request is allowed, False if rate limited.
    """
    key = f"rate_limit:{user_id}"
    now = time.time()
    window_start = now - window

    pipe = redis.pipeline()
    # Remove old requests outside window
    pipe.zremrangebyscore(key, 0, window_start)
    # Count current requests
    pipe.zcard(key)
    # Add current request
    pipe.zadd(key, {str(now): now})
    # Set TTL
    pipe.expire(key, window)
    results = pipe.execute()

    current_count = results[1]
    return current_count < limit

# Usage
if not check_rate_limit(f"user:{user_id}", limit=100, window=60):
    raise TooManyRequestsError("Rate limit exceeded")

Redis — In-Memory Data Store

Redis — In-Memory Data Store

Redis — In-Memory Data Store