Replace in-memory TTL cache with Redis

services/smart.py

@@ -1,10 +1,11 @@
 import asyncio
 import json
 import logging
+import os
 import re
 import shutil
 
-from services.cache import smart_cache
+from services.cache import cache_get, cache_set
 
 logger = logging.getLogger(__name__)
 
@@ -17,6 +18,8 @@ ATTR_PENDING = 197
 ATTR_UNCORRECTABLE = 198
 ATTR_WEAR_LEVELING = 177  # SSD wear leveling
 
+SMART_CACHE_TTL = int(os.environ.get("SMART_CACHE_TTL", "120"))
+
 
 def smartctl_available() -> bool:
     return shutil.which("smartctl") is not None
@@ -26,19 +29,22 @@ def sg_ses_available() -> bool:
     return shutil.which("sg_ses") is not None
 
 
-async def get_smart_data(device: str) -> dict:
-    """Run smartctl -a -j against a device, with caching."""
+async def get_smart_data(device: str) -> tuple[dict, bool]:
+    """Run smartctl -a -j against a device, with caching.
+
+    Returns (data, cache_hit) tuple.
+    """
     # Sanitize device name: only allow alphanumeric and hyphens
     if not re.match(r"^[a-zA-Z0-9\-]+$", device):
         raise ValueError(f"Invalid device name: {device}")
 
-    cached = smart_cache.get(device)
+    cached = await cache_get(f"jbod:smart:{device}")
     if cached is not None:
-        return cached
+        return (cached, True)
 
     result = await _run_smartctl(device)
-    smart_cache.set(device, result)
-    return result
+    await cache_set(f"jbod:smart:{device}", result, SMART_CACHE_TTL)
+    return (result, False)
 
 
 async def _run_smartctl(device: str) -> dict: