Added `application` plugin.

docs/source/platypush/plugins/application.rst

@@ -0,0 +1,5 @@
+``application``
+===============
+
+.. automodule:: platypush.plugins.application
+    :members:

docs/source/plugins.rst

@@ -8,6 +8,7 @@ Plugins
 
     platypush/plugins/adafruit.io.rst
     platypush/plugins/alarm.rst
+    platypush/plugins/application.rst
     platypush/plugins/arduino.rst
     platypush/plugins/assistant.echo.rst
     platypush/plugins/assistant.google.rst

platypush/plugins/application/__init__.py

@@ -0,0 +1,31 @@
+from typing import Optional
+from platypush.commands import CommandStream, RestartCommand, StopCommand
+from platypush.config import Config
+from platypush.plugins import Plugin, action
+
+
+class ApplicationPlugin(Plugin):
+    """
+    This plugin is used to control and inspect the application state.
+    """
+
+    @property
+    def _ctrl_sock(self) -> Optional[str]:
+        """
+        :return: The path to the UNIX socket to control the application.
+        """
+        return Config.get('ctrl_sock')  # type: ignore
+
+    @action
+    def stop(self):
+        """
+        Stop the application.
+        """
+        CommandStream(self._ctrl_sock).write(StopCommand())
+
+    @action
+    def restart(self):
+        """
+        Restart the application.
+        """
+        CommandStream(self._ctrl_sock).write(RestartCommand())

platypush/plugins/application/manifest.yaml

@@ -0,0 +1,6 @@
+manifest:
+  events: {}
+  install:
+    pip: []
+  package: platypush.plugins.application
+  type: plugin