48 lines
1.4 KiB
Python
48 lines
1.4 KiB
Python
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from __future__ import annotations
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import threading
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import time
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from collections import OrderedDict
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from dataclasses import dataclass
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@dataclass
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class DedupeConfig:
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ttl_seconds: float = 300.0
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max_entries: int = 10000
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class MessageDeduplicator:
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def __init__(self, config: DedupeConfig | None = None):
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self._config = config or DedupeConfig()
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self._cache: OrderedDict[str, float] = OrderedDict()
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self._lock = threading.Lock()
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def is_duplicate(self, message_id: str) -> bool:
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now = time.monotonic()
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with self._lock:
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self._evict_expired(now)
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if message_id in self._cache:
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return True
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if len(self._cache) >= self._config.max_entries:
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self._cache.popitem(last=False)
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self._cache[message_id] = now
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self._cache.move_to_end(message_id)
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return False
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def record(self, message_id: str) -> None:
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now = time.monotonic()
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with self._lock:
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self._evict_expired(now)
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self._cache[message_id] = now
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self._cache.move_to_end(message_id)
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def clear(self) -> None:
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with self._lock:
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self._cache.clear()
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def _evict_expired(self, now: float) -> None:
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expired = [k for k, t in self._cache.items() if now - t > self._config.ttl_seconds]
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for k in expired:
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del self._cache[k]
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