83 lines
2.8 KiB
Python
83 lines
2.8 KiB
Python
"""路由缓存"""
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import asyncio
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import time
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from collections import OrderedDict
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from dataclasses import dataclass
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from typing import Any
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@dataclass
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class _CacheEntry:
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value: Any
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timestamp: float
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class RouteCache:
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"""基于 OrderedDict 的进程内 LRU 缓存，上限 4000 条，默认 TTL 60 秒。
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使用 asyncio.Lock 保护并发访问；批量失效时收集待删除 key 后统一移除。
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"""
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def __init__(self, maxsize: int = 4000, ttl_seconds: float = 60) -> None:
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self.maxsize = max(maxsize, 1)
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self.ttl = ttl_seconds
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self._data: OrderedDict[str, _CacheEntry] = OrderedDict()
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self._lock = asyncio.Lock()
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def _is_expired(self, entry: _CacheEntry) -> bool:
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return time.time() - entry.timestamp > self.ttl
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async def get(self, key: str) -> Any | None:
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async with self._lock:
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entry = self._data.get(key)
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if entry is None:
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return None
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if self._is_expired(entry):
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self._data.pop(key, None)
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return None
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self._data.move_to_end(key)
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return entry.value
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async def set(self, key: str, value: Any) -> None:
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async with self._lock:
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if key in self._data:
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self._data.move_to_end(key)
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else:
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while len(self._data) >= self.maxsize:
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self._data.popitem(last=False)
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self._data[key] = _CacheEntry(value=value, timestamp=time.time())
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async def clear(self) -> None:
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async with self._lock:
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self._data.clear()
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async def invalidate_by_channel(self, channel_type: str) -> int:
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"""移除所有以 `channel_type:` 开头的缓存条目，返回移除数量。"""
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prefix = f"{channel_type}:"
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async with self._lock:
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keys_to_remove = [k for k in self._data if k.startswith(prefix)]
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for k in keys_to_remove:
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self._data.pop(k, None)
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return len(keys_to_remove)
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async def invalidate_by_account(self, channel_type: str, account_id: str) -> int:
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"""移除所有以 `channel_type:account_id:` 开头的缓存条目，返回移除数量。"""
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prefix = f"{channel_type}:{account_id}:"
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async with self._lock:
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keys_to_remove = [k for k in self._data if k.startswith(prefix)]
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for k in keys_to_remove:
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self._data.pop(k, None)
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return len(keys_to_remove)
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_default_route_cache: RouteCache | None = None
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def get_default_route_cache() -> RouteCache:
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"""返回全局共享的默认路由缓存实例。"""
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global _default_route_cache
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if _default_route_cache is None:
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_default_route_cache = RouteCache(maxsize=4000, ttl_seconds=60)
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return _default_route_cache
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