145 lines
3.7 KiB
Python
145 lines
3.7 KiB
Python
"""
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缓存服务
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提供数据缓存功能（使用内存缓存）
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"""
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import time
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from typing import Optional, Any, Dict
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from app.utils.logger import logger
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class CacheService:
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"""内存缓存服务类"""
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def __init__(self):
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"""初始化内存缓存"""
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self._cache: Dict[str, tuple[Any, float]] = {} # key: (value, expire_time)
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logger.info("内存缓存初始化成功")
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def get(self, key: str) -> Optional[Any]:
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"""
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获取缓存数据
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Args:
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key: 缓存键
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Returns:
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缓存的数据，不存在或过期返回None
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"""
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try:
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if key in self._cache:
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value, expire_time = self._cache[key]
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# 检查是否过期
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if time.time() < expire_time:
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return value
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else:
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# 删除过期数据
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del self._cache[key]
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return None
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except Exception as e:
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logger.error(f"获取缓存失败: {e}")
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return None
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def set(self, key: str, value: Any, ttl: int = 3600) -> bool:
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"""
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设置缓存数据
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Args:
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key: 缓存键
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value: 要缓存的数据
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ttl: 过期时间（秒）
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Returns:
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是否成功
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"""
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try:
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expire_time = time.time() + ttl
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self._cache[key] = (value, expire_time)
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return True
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except Exception as e:
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logger.error(f"设置缓存失败: {e}")
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return False
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def delete(self, key: str) -> bool:
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"""
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删除缓存
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Args:
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key: 缓存键
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Returns:
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是否成功
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"""
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try:
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if key in self._cache:
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del self._cache[key]
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return True
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except Exception as e:
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logger.error(f"删除缓存失败: {e}")
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return False
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def exists(self, key: str) -> bool:
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"""
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检查缓存是否存在
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Args:
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key: 缓存键
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Returns:
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是否存在
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"""
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try:
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if key in self._cache:
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_, expire_time = self._cache[key]
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if time.time() < expire_time:
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return True
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else:
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del self._cache[key]
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return False
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except Exception as e:
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logger.error(f"检查缓存失败: {e}")
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return False
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def clear_pattern(self, pattern: str) -> int:
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"""
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清除匹配模式的所有缓存
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Args:
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pattern: 键模式（如 "stock:*"）
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Returns:
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删除的键数量
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"""
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try:
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# 简单的模式匹配（支持*通配符）
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pattern = pattern.replace('*', '')
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keys_to_delete = [k for k in self._cache.keys() if pattern in k]
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for key in keys_to_delete:
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del self._cache[key]
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return len(keys_to_delete)
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except Exception as e:
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logger.error(f"清除缓存失败: {e}")
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return 0
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def clear_expired(self):
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"""清除所有过期的缓存"""
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try:
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current_time = time.time()
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expired_keys = [
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key for key, (_, expire_time) in self._cache.items()
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if current_time >= expire_time
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]
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for key in expired_keys:
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del self._cache[key]
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if expired_keys:
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logger.info(f"清除了{len(expired_keys)}个过期缓存")
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except Exception as e:
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logger.error(f"清除过期缓存失败: {e}")
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# 创建全局实例
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cache_service = CacheService()
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