handle deletions in the top layer

owrx/config/__init__.py

@@ -37,3 +37,7 @@ class Config(PropertyStack):
     def __setitem__(self, key, value):
         # in the config, all writes go to the json layer
         return self.storableConfig.__setitem__(key, value)
+
+    def __delitem__(self, key):
+        # all deletes go to the json layer, too
+        return self.storableConfig.__delitem__(key)

owrx/config/dynamic.py

@@ -6,6 +6,8 @@ import json
 
 
 class DynamicConfig(PropertyLayer):
+    _deleted = object()
+
     def __init__(self):
         super().__init__()
         try:
@@ -39,3 +41,21 @@ class DynamicConfig(PropertyLayer):
         jsonContent = json.dumps(self.__dict__(), indent=4, cls=Encoder)
         with open(DynamicConfig._getSettingsFile(), "w") as file:
             file.write(jsonContent)
+
+    def __delitem__(self, key):
+        self.__setitem__(key, DynamicConfig._deleted)
+
+    def __contains__(self, item):
+        if not super().__contains__(item):
+            return False
+        if super().__getitem__(item) is DynamicConfig._deleted:
+            return False
+        return True
+
+    def __getitem__(self, item):
+        if self.__contains__(item):
+            return super().__getitem__(item)
+        raise KeyError('Key "{key}" does not exist'.format(key=item))
+
+    def __dict__(self):
+        return {k: v for k, v in super().__dict__().items() if v is not DynamicConfig._deleted}