Expose the wrapped function in `@action`.

Added a `wrapped` "hidden" parameter to the function returned by the
`@action` decorator.

We need this to access the underlying decorated function when e.g. we
need to access its specs or decorators.

platypush/plugins/__init__.py

@@ -56,6 +56,8 @@ def action(f: Callable[..., Any]) -> Callable[..., Response]:
 
     # Propagate the docstring
     _execute_action.__doc__ = f.__doc__
+    # Expose the wrapped function
+    _execute_action.wrapped = f  # type: ignore
     return _execute_action
 
 
@@ -64,6 +66,7 @@ class Plugin(EventGenerator, ExtensionWithManifest):  # lgtm [py/missing-call-to
 
     def __init__(self, **kwargs):
         super().__init__()
+
         self.logger = logging.getLogger(
             'platypush:plugin:' + get_plugin_name_by_class(self.__class__)
         )
@@ -264,6 +267,7 @@ class AsyncRunnablePlugin(RunnablePlugin, ABC):
         """
         Initialize an event loop and run the listener as a task.
         """
+        assert self._loop, 'The loop is not initialized'
         asyncio.set_event_loop(self._loop)
 
         self._task = self._loop.create_task(self._listen())

platypush/utils/__init__.py

@@ -107,7 +107,7 @@ def get_plugin_class_by_name(plugin_name) -> Optional[type]:
         return None
 
 
-def get_plugin_name_by_class(plugin) -> Optional[str]:
+def get_plugin_name_by_class(plugin) -> str:
     """Gets the common name of a plugin (e.g. "music.mpd" or "media.vlc") given its class."""
 
     from platypush.plugins import Plugin