ConfigUnit: fix static class variable inheritance

include/py/homekit/config/config.py

@@ -52,6 +52,8 @@ class BaseConfigUnit(ABC):
     def load_from(self, path: str):
         with open(path, 'r') as fd:
             self._data = yaml.safe_load(fd)
+            if self._data is None:
+                raise TypeError(f'config file {path} is empty')
 
     def get(self,
             key: Optional[str] = None,
@@ -78,6 +80,10 @@ class ConfigUnit(BaseConfigUnit):
 
     _instance = None
 
+    def __init_subclass__(cls, **kwargs):
+        super().__init_subclass__(**kwargs)
+        cls._instance = None
+
     def __new__(cls, *args, **kwargs):
         if cls._instance is None:
             cls._instance = super(ConfigUnit, cls).__new__(cls, *args, **kwargs)
@@ -200,7 +206,7 @@ class AppConfigUnit(ConfigUnit):
     def logging_get_fmt(self) -> Optional[str]:
         try:
             return self['logging']['default_fmt']
-        except KeyError:
+        except (KeyError, TypeError):
             return self._logging_fmt
 
     def logging_set_file(self, file: str) -> None:
@@ -209,7 +215,7 @@ class AppConfigUnit(ConfigUnit):
     def logging_get_file(self) -> Optional[str]:
         try:
             return self['logging']['file']
-        except KeyError:
+        except (KeyError, TypeError):
             return self._logging_file
 
     def logging_set_verbose(self):
@@ -218,7 +224,7 @@ class AppConfigUnit(ConfigUnit):
     def logging_is_verbose(self) -> bool:
         try:
             return bool(self['logging']['verbose'])
-        except KeyError:
+        except (KeyError, TypeError):
             return self._logging_verbose
 
 
@@ -271,7 +277,9 @@ class Config:
                 and not isinstance(name, bool) \
                 and issubclass(name, AppConfigUnit) or name == AppConfigUnit:
             self.app_name = name.NAME
+            print(self.app_config)
             self.app_config = name()
+            print(self.app_config)
             app_config = self.app_config
         else:
             self.app_name = name if isinstance(name, str) else None