Refactor multifilesystem

radicale/storage/multifilesystem/meta.py

@@ -0,0 +1,49 @@
+# This file is part of Radicale Server - Calendar Server
+# Copyright © 2014 Jean-Marc Martins
+# Copyright © 2012-2017 Guillaume Ayoub
+# Copyright © 2017-2018 Unrud<unrud@outlook.com>
+#
+# This library is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Radicale.  If not, see <http://www.gnu.org/licenses/>.
+
+import json
+import os
+
+from radicale import item as radicale_item
+
+
+class CollectionMetaMixin:
+    def __init__(self):
+        super().__init__()
+        self._meta_cache = None
+        self._props_path = os.path.join(
+            self._filesystem_path, ".Radicale.props")
+
+    def get_meta(self, key=None):
+        # reuse cached value if the storage is read-only
+        if self._lock.locked == "w" or self._meta_cache is None:
+            try:
+                try:
+                    with open(self._props_path, encoding=self._encoding) as f:
+                        self._meta_cache = json.load(f)
+                except FileNotFoundError:
+                    self._meta_cache = {}
+                radicale_item.check_and_sanitize_props(self._meta_cache)
+            except ValueError as e:
+                raise RuntimeError("Failed to load properties of collection "
+                                   "%r: %s" % (self.path, e)) from e
+        return self._meta_cache.get(key) if key else self._meta_cache
+
+    def set_meta(self, props):
+        with self._atomic_write(self._props_path, "w") as f:
+            json.dump(props, f, sort_keys=True)