30 lines
838 B
Python
30 lines
838 B
Python
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import time
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from collections import OrderedDict
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class MessageDeduplicator:
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def __init__(self, max_size: int = 10000, ttl_seconds: int = 300):
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self._max_size = max_size
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self._ttl_seconds = ttl_seconds
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self._cache: OrderedDict[str, float] = OrderedDict()
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def is_duplicate(self, msg_id: str) -> bool:
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now = time.time()
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self._evict_expired(now)
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if msg_id in self._cache:
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return True
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self._cache[msg_id] = now
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if len(self._cache) > self._max_size:
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self._cache.popitem(last=False)
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return False
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def _evict_expired(self, now: float):
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expire_before = now - self._ttl_seconds
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expired = [mid for mid, ts in self._cache.items() if ts < expire_before]
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for mid in expired:
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self._cache.pop(mid, None)
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