1 files changed, 70 insertions, 0 deletions
diff --git a/qvisqve/file_store.py b/qvisqve/file_store.py
new file mode 100644
index 0000000..3fd5186
--- /dev/null
+++ b/qvisqve/file_store.py
@@ -0,0 +1,70 @@
+# Copyright (C) 2018  Lars Wirzenius
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+import os
+
+import yaml
+
+
+class FileStore:
+
+    def __init__(self, dirname):
+        self._dirname = dirname
+
+    def _typedir(self, resource_type):
+        return os.path.join(self._dirname, resource_type)
+
+    def _filename(self, resource_type, resource_id):
+        dirname = self._typedir(resource_type)
+        return os.path.join(dirname, resource_id)
+
+    def list(self, resource_type):
+        dirname = self._typedir(resource_type)
+        if not os.path.isdir(dirname):
+            return []
+        return [
+            x
+            for x in sorted(os.listdir(self._typedir(resource_type)))
+        ]
+
+    def get(self, resource_type, resource_id):
+        filename = self._filename(resource_type, resource_id)
+        if os.path.exists(filename):
+            with open(filename) as f:
+                return yaml.safe_load(f)
+        raise ResourceDoesNotExist(resource_type, resource_id)
+
+    def create(self, resource_type, resource_id, resource):
+        dirname = self._typedir(resource_type)
+        if not os.path.exists(dirname):
+            os.mkdir(dirname)
+
+        filename = self._filename(resource_type, resource_id)
+        with open(filename, 'w') as f:
+            yaml.safe_dump(resource, stream=f)
+
+
+class ResourceStoreError(Exception):
+
+    pass
+
+
+class ResourceDoesNotExist(ResourceStoreError):
+
+    def __init__(self, resource_type, resource_id):
+        super().__init__(
+            'Resource does not exist: {}:{}'.format(
+                resource_type, resource_id))