WIP: Migrate scene to async + homeassistant scene async (#4665)

* Migrate scene to async + homeassistant scene async

* fix lint

* Update state.py

* Fix tests

homeassistant/components/scene/__init__.py

@@ -4,6 +4,7 @@ Allow users to set and activate scenes.
 For more details about this component, please refer to the documentation at
 https://home-assistant.io/components/scene/
 """
+import asyncio
 import logging
 from collections import namedtuple
 
@@ -39,7 +40,8 @@ def activate(hass, entity_id=None):
     hass.services.call(DOMAIN, SERVICE_TURN_ON, data)
 
 
-def setup(hass, config):
+@asyncio.coroutine
+def async_setup(hass, config):
     """Setup scenes."""
     logger = logging.getLogger(__name__)
 
@@ -59,17 +61,21 @@ def setup(hass, config):
 
     component = EntityComponent(logger, DOMAIN, hass)
 
-    component.setup(config)
+    yield from component.async_setup(config)
 
-    def handle_scene_service(service):
+    @asyncio.coroutine
+    def async_handle_scene_service(service):
         """Handle calls to the switch services."""
-        target_scenes = component.extract_from_service(service)
+        target_scenes = component.async_extract_from_service(service)
+        print(target_scenes)
+        print(component.entities)
+        tasks = [scene.async_activate() for scene in target_scenes]
+        if tasks:
+            yield from asyncio.wait(tasks, loop=hass.loop)
 
-        for scene in target_scenes:
-            scene.activate()
-
-    hass.services.register(DOMAIN, SERVICE_TURN_ON, handle_scene_service,
-                           schema=SCENE_SERVICE_SCHEMA)
+    hass.services.async_register(
+        DOMAIN, SERVICE_TURN_ON, async_handle_scene_service,
+        schema=SCENE_SERVICE_SCHEMA)
 
     return True
 
@@ -89,4 +95,12 @@ class Scene(Entity):
 
     def activate(self):
         """Activate scene. Try to get entities into requested state."""
-        raise NotImplementedError
+        raise NotImplementedError()
+
+    @asyncio.coroutine
+    def async_activate(self):
+        """Activate scene. Try to get entities into requested state.
+
+        This method is a coroutine.
+        """
+        yield from self.hass.loop.run_in_executor(None, self.activate)