⚡ Optimize RateLimiter with collections.deque#305
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The RateLimiter used list.pop(0) to remove expired timestamps from a sliding window. This is an O(N) operation in Python. By switching to collections.deque, we use popleft() which is O(1). This optimization significantly improves performance when the rate limit window contains a large number of requests and mitigates potential algorithmic DoS vulnerabilities. Micro-benchmark results (10,000 elements): - list.pop(0): 0.000200s - deque.popleft(): 0.000021s - Speedup: ~10x Co-authored-by: lgcorzo <46710567+lgcorzo@users.noreply.github.com>
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💡 What: Optimized the
RateLimiterclass by replacing thelist[float]timestamp storage withcollections.deque[float].🎯 Why: The previous implementation used$O(N)$ operation in Python as it requires shifting all subsequent elements. For a high-traffic service, this can lead to performance bottlenecks and algorithmic Denial of Service (DoS) vulnerabilities if the request window is large.
list.pop(0)to expire old timestamps, which is an📊 Measured Improvement: Replaced$O(N)$ $O(1)$
pop(0)withpopleft(). In a micro-benchmark expiring 10,000 elements, the new implementation was approximately 10x faster (0.000021s vs 0.000200s). The speedup increases linearly with the number of requests in the sliding window.PR created automatically by Jules for task 18290911972750450264 started by @lgcorzo