Replace in-memory TTL cache with Redis

services/zfs.py

@@ -4,11 +4,15 @@ import logging
 import re
 from pathlib import Path
 
+from services.cache import cache_get, cache_set
+
 logger = logging.getLogger(__name__)
 
 # Allow overriding the zpool binary path via env (for bind-mounted host tools)
 ZPOOL_BIN = os.environ.get("ZPOOL_BIN", "zpool")
 
+ZFS_CACHE_TTL = 300
+
 
 async def get_zfs_pool_map() -> dict[str, dict]:
     """Return a dict mapping device names to ZFS pool and vdev info.
@@ -16,6 +20,10 @@ async def get_zfs_pool_map() -> dict[str, dict]:
     e.g. {"sda": {"pool": "tank", "vdev": "raidz2-0"},
           "sdb": {"pool": "fast", "vdev": "mirror-0"}}
     """
+    cached = await cache_get("jbod:zfs_map")
+    if cached is not None:
+        return cached
+
     pool_map = {}
     try:
         # When running in a container with pid:host, use nsenter to run
@@ -94,6 +102,8 @@ async def get_zfs_pool_map() -> dict[str, dict]:
                     pass
     except FileNotFoundError:
         logger.debug("zpool not available")
+
+    await cache_set("jbod:zfs_map", pool_map, ZFS_CACHE_TTL)
     return pool_map