Initial commit: FastAPI JBOD monitor backend

services/cache.py

@@ -0,0 +1,29 @@
+import time
+from typing import Any
+
+
+class TTLCache:
+    """Simple in-memory TTL cache."""
+
+    def __init__(self, ttl_seconds: int = 60):
+        self._ttl = ttl_seconds
+        self._store: dict[str, tuple[float, Any]] = {}
+
+    def get(self, key: str) -> Any | None:
+        entry = self._store.get(key)
+        if entry is None:
+            return None
+        ts, value = entry
+        if time.monotonic() - ts > self._ttl:
+            del self._store[key]
+            return None
+        return value
+
+    def set(self, key: str, value: Any) -> None:
+        self._store[key] = (time.monotonic(), value)
+
+    def clear(self) -> None:
+        self._store.clear()
+
+
+smart_cache = TTLCache(ttl_seconds=60)