mirror of
https://github.com/spalencsar/bearhub.git
synced 2026-07-06 22:54:16 +02:00
65 lines
1.8 KiB
Python
65 lines
1.8 KiB
Python
from datetime import datetime, timedelta
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from threading import Lock
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class Cache:
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def __init__(self, expiration_time: int):
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self.expiration_time = expiration_time
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self._cache = {}
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self.lock = Lock()
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def is_enabled(self):
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return self.expiration_time < 0 or self.expiration_time > 0
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def add(self, key: str, val: object):
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if key and self.is_enabled():
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self.lock.acquire()
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self._add(key, val)
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self.lock.release()
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def _add(self, key: str, val: object):
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if key:
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self._cache[key] = {'val': val, 'expires_at': datetime.utcnow() + timedelta(seconds=self.expiration_time) if self.expiration_time > 0 else None}
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def add_non_existing(self, key: str, val: object):
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if key and self. is_enabled():
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self.lock.acquire()
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cur_val = self.get(key)
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if cur_val is None:
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self._add(key, val)
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self.lock.release()
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def get(self, key: str):
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if key and self.is_enabled():
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val = self._cache.get(key)
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if val:
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expiration = val.get('expires_at')
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if expiration and expiration <= datetime.utcnow():
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self.lock.acquire()
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del self._cache[key]
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self.lock.release()
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return None
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return val['val']
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def delete(self, key):
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if key and self.is_enabled():
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if key in self._cache:
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self.lock.acquire()
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del self._cache[key]
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self.lock.release()
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def keys(self):
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return set(self._cache.keys()) if self.is_enabled() else set()
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def clean_expired(self):
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if self.is_enabled():
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for key in self.keys():
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self.get(key)
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