init

app/services/cache.py

@@ -0,0 +1,30 @@
+from __future__ import annotations
+
+import time
+from dataclasses import dataclass
+from typing import Generic, TypeVar
+
+T = TypeVar("T")
+
+
+@dataclass
+class CacheItem(Generic[T]):
+    value: T
+    expires_at: float
+
+
+class TTLCache(Generic[T]):
+    def __init__(self) -> None:
+        self._store: dict[str, CacheItem[T]] = {}
+
+    def get(self, key: str) -> T | None:
+        item = self._store.get(key)
+        if item is None:
+            return None
+        if item.expires_at < time.time():
+            self._store.pop(key, None)
+            return None
+        return item.value
+
+    def set(self, key: str, value: T, ttl_seconds: int) -> None:
+        self._store[key] = CacheItem(value=value, expires_at=time.time() + ttl_seconds)