Improve: avoid automatically invalid cache on upgrade in case no change on cache structure

CHANGELOG.md

@@ -9,6 +9,7 @@
 * Add: option [storage] use_cache_subfolder_for_synctoken for storing 'sync-token' cache outside collection-root
 * Add: option [storage] folder_umask for configuration of umask (overwrite system-default)
 * Fix: also remove 'item' from cache on delete
+* Improve: avoid automatically invalid cache on upgrade in case no change on cache structure
 
 ## 3.3.1
 

radicale/storage/__init__.py

@@ -32,20 +32,22 @@ from typing import (Callable, ContextManager, Iterable, Iterator, Mapping,
 import vobject
 
 from radicale import config
+from radicale.log import logger
 from radicale import item as radicale_item
 from radicale import types, utils
 from radicale.item import filter as radicale_filter
 
 INTERNAL_TYPES: Sequence[str] = ("multifilesystem", "multifilesystem_nolock",)
 
-CACHE_DEPS: Sequence[str] = ("radicale", "vobject")
-CACHE_VERSION: bytes = "".join(
-    "%s=%s;" % (pkg, utils.package_version(pkg))
-    for pkg in CACHE_DEPS).encode()
+# NOTE: change only if cache structure is modified to avoid cache invalidation on update
+CACHE_VERSION_RADICALE = "3.3.1"
+
+CACHE_VERSION: bytes = ("%s=%s;%s=%s;" % ("radicale", CACHE_VERSION_RADICALE, "vobject", utils.package_version("vobject"))).encode()
 
 
 def load(configuration: "config.Configuration") -> "BaseStorage":
     """Load the storage module chosen in configuration."""
+    logger.debug("storage cache version: %r", str(CACHE_VERSION))
     return utils.load_plugin(INTERNAL_TYPES, "storage", "Storage", BaseStorage,
                              configuration)