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27 lines
814 B
Python
27 lines
814 B
Python
import time
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class ExpiredDict(dict):
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def __init__(self, expires_in_seconds):
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super().__init__()
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self.expires_in_seconds = expires_in_seconds
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def __getitem__(self, key):
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value, expiry_time = super().__getitem__(key)
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# 如果元素已过期，则从字典中删除该元素并抛出 KeyError 异常
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if time.monotonic() > expiry_time:
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del self[key]
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raise KeyError("expired {}".format(key))
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self.__setitem__(key, value)
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return value
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def __setitem__(self, key, value):
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# 刷新元素缓存时间
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super().__setitem__(key, (value, time.monotonic() + self.expires_in_seconds))
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def get(self, key, default=None):
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try:
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return self[key]
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except KeyError:
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return default
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