55 lines
1.4 KiB
Python
55 lines
1.4 KiB
Python
# retoor <retoor@molodetz.nl>
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import threading
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import time
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class TTLCache:
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def __init__(self, ttl=60, max_size=1000):
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self.ttl = ttl
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self.max_size = max_size
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self._data = {}
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self._lock = threading.Lock()
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def get(self, key, default=None):
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if self.ttl <= 0:
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return default
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with self._lock:
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item = self._data.get(key)
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if item is None:
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return default
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expires, value = item
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if expires < time.monotonic():
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self._data.pop(key, None)
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return default
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return value
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def set(self, key, value):
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if self.ttl <= 0:
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return
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with self._lock:
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if len(self._data) >= self.max_size:
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self._evict()
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self._data[key] = (time.monotonic() + self.ttl, value)
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def pop(self, key):
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with self._lock:
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self._data.pop(key, None)
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def clear(self):
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with self._lock:
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self._data.clear()
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def __contains__(self, key):
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return self.get(key, _MISSING) is not _MISSING
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def _evict(self):
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now = time.monotonic()
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expired = [k for k, (exp, _) in self._data.items() if exp < now]
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for key in expired:
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self._data.pop(key, None)
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while len(self._data) >= self.max_size:
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self._data.pop(next(iter(self._data)))
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_MISSING = object()
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