65 lines
1.5 KiB
Python
65 lines
1.5 KiB
Python
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from __future__ import annotations
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from typing import List, Optional
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try:
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import redis
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except Exception:
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redis = None
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class CacheBase:
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"""缓存接口"""
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def get(self, key: str) -> Optional[str]:
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raise NotImplementedError
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def set(self, key: str, value: str, ttl: int = None) -> None:
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raise NotImplementedError
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def delete(self, key: str) -> None:
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raise NotImplementedError
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def keys(self, pattern: str) -> List[str]:
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raise NotImplementedError
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class NoopCache(CacheBase):
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"""空实现缓存"""
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def get(self, key: str) -> Optional[str]:
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return None
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def set(self, key: str, value: str, ttl: int = None) -> None:
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return None
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def delete(self, key: str) -> None:
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return None
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def keys(self, pattern: str) -> List[str]:
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return []
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class RedisCache(CacheBase):
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"""Redis 缓存实现"""
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def __init__(self, url: str, db: int = 0):
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if redis is None:
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raise ImportError("未安装 redis 依赖")
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self._client = redis.Redis.from_url(url, db=db, decode_responses=True)
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def get(self, key: str) -> Optional[str]:
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return self._client.get(key)
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def set(self, key: str, value: str, ttl: int = None) -> None:
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if ttl:
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self._client.set(key, value, ex=ttl)
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else:
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self._client.set(key, value)
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def delete(self, key: str) -> None:
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self._client.delete(key)
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def keys(self, pattern: str) -> List[str]:
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return self._client.keys(pattern)
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