Add media_player.sonos_group_players service (#2087)

Sonos platform supports a `party mode` feature that groups all
available players into a single group, of which the calling player
will be the coordinator.

homeassistant/components/media_player/services.yaml

@@ -145,3 +145,11 @@ select_source:
     source:
       description: Name of the source to switch to. Platform dependent.
       example: 'video1'
+
+sonos_group_players:
+  description: Send Sonos media player the command for grouping all players into one (party mode).
+
+  fields:
+    entity_id:
+      description: Name(s) of entites that will coordinate the grouping. Platform dependent.
+      example: 'media_player.living_room_sonos'

homeassistant/components/media_player/sonos.py

@@ -7,13 +7,15 @@ https://home-assistant.io/components/media_player.sonos/
 import datetime
 import logging
 import socket
+from os import path
 
 from homeassistant.components.media_player import (
-    ATTR_MEDIA_ENQUEUE, MEDIA_TYPE_MUSIC, SUPPORT_NEXT_TRACK, SUPPORT_PAUSE,
-    SUPPORT_PLAY_MEDIA, SUPPORT_PREVIOUS_TRACK, SUPPORT_SEEK,
+    ATTR_MEDIA_ENQUEUE, DOMAIN, MEDIA_TYPE_MUSIC, SUPPORT_NEXT_TRACK,
+    SUPPORT_PAUSE, SUPPORT_PLAY_MEDIA, SUPPORT_PREVIOUS_TRACK, SUPPORT_SEEK,
     SUPPORT_VOLUME_MUTE, SUPPORT_VOLUME_SET, MediaPlayerDevice)
 from homeassistant.const import (
     STATE_IDLE, STATE_PAUSED, STATE_PLAYING, STATE_UNKNOWN, STATE_OFF)
+from homeassistant.config import load_yaml_config_file
 
 REQUIREMENTS = ['SoCo==0.11.1']
 
@@ -31,6 +33,8 @@ SUPPORT_SONOS = SUPPORT_PAUSE | SUPPORT_VOLUME_SET | SUPPORT_VOLUME_MUTE |\
     SUPPORT_PREVIOUS_TRACK | SUPPORT_NEXT_TRACK | SUPPORT_PLAY_MEDIA |\
     SUPPORT_SEEK
 
+SERVICE_GROUP_PLAYERS = 'sonos_group_players'
+
 
 # pylint: disable=unused-argument
 def setup_platform(hass, config, add_devices, discovery_info=None):
@@ -62,9 +66,31 @@ def setup_platform(hass, config, add_devices, discovery_info=None):
         _LOGGER.warning('No Sonos speakers found.')
         return False
 
-    add_devices(SonosDevice(hass, p) for p in players)
+    devices = [SonosDevice(hass, p) for p in players]
+    add_devices(devices)
     _LOGGER.info('Added %s Sonos speakers', len(players))
 
+    def group_players_service(service):
+        """Group media players, use player as coordinator."""
+        entity_id = service.data.get('entity_id')
+
+        if entity_id:
+            _devices = [device for device in devices
+                        if device.entity_id == entity_id]
+        else:
+            _devices = devices
+
+        for device in _devices:
+            device.group_players()
+            device.update_ha_state(True)
+
+    descriptions = load_yaml_config_file(
+        path.join(path.dirname(__file__), 'services.yaml'))
+
+    hass.services.register(DOMAIN, SERVICE_GROUP_PLAYERS,
+                           group_players_service,
+                           descriptions.get(SERVICE_GROUP_PLAYERS))
+
     return True
 
 
@@ -113,7 +139,7 @@ class SonosDevice(MediaPlayerDevice):
 
     @property
     def should_poll(self):
-        """No polling needed."""
+        """Polling needed."""
         return True
 
     def update_sonos(self, now):
@@ -284,6 +310,11 @@ class SonosDevice(MediaPlayerDevice):
         else:
             self._player.play_uri(media_id)
 
+    @only_if_coordinator
+    def group_players(self):
+        """Group all players under this coordinator."""
+        self._player.partymode()
+
     @property
     def available(self):
         """Return True if player is reachable, False otherwise."""