Initial commit

full_updater/backend/cache.py

@@ -0,0 +1,44 @@
+import json
+import os
+import shutil
+from datetime import datetime
+from typing import Any
+
+CACHE_DIR = "/tmp/full-updater-cache"
+
+
+def ensure_cache_dir() -> None:
+    if os.path.exists(CACHE_DIR):
+        shutil.rmtree(CACHE_DIR)
+    os.makedirs(CACHE_DIR, exist_ok=True)
+
+
+def write_cache(target_id: str, data: dict[str, Any]) -> None:
+    ensure_cache_dir()
+    path = os.path.join(CACHE_DIR, f"{target_id}.json")
+    with open(path, "w", encoding="utf-8") as f:
+        json.dump(data, f, indent=2)
+
+
+def read_cache(target_id: str) -> dict[str, Any] | None:
+    path = os.path.join(CACHE_DIR, f"{target_id}.json")
+    if not os.path.exists(path):
+        return None
+    with open(path, "r", encoding="utf-8") as f:
+        return json.load(f)
+
+
+def get_cache_timestamp(target_id: str) -> str:
+    path = os.path.join(CACHE_DIR, f"{target_id}.json")
+    if not os.path.exists(path):
+        return ""
+    try:
+        with open(path, "r", encoding="utf-8") as f:
+            data = json.load(f)
+        ts = data.get("timestamp", "")
+        if ts:
+            dt = datetime.fromisoformat(ts)
+            return dt.strftime("%H:%M:%S")
+    except Exception:
+        pass
+    return ""