34 lines
973 B
Python
34 lines
973 B
Python
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from typing import Any, Protocol
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class CacheClient(Protocol):
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async def get(self, key: str) -> Any: ...
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async def set(self, key: str, value: str, ex: int | None = None) -> Any: ...
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class CacheReadResult:
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def __init__(self, value: Any, degraded: bool = False) -> None:
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self.value = value
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self.degraded = degraded
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class MemoryCacheAdapter:
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"""Cache is an optimization; failures must not block MySQL recall."""
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def __init__(self, client: CacheClient) -> None:
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self.client = client
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async def get(self, key: str) -> CacheReadResult:
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try:
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return CacheReadResult(await self.client.get(key))
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except Exception:
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return CacheReadResult(None, degraded=True)
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async def set(self, key: str, value: str, ttl_seconds: int = 300) -> bool:
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try:
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await self.client.set(key, value, ex=ttl_seconds)
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return True
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except Exception:
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return False
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