starting light template component

homeassistant/components/light/template.py

@@ -0,0 +1,192 @@
+"""
+Support for Template lights.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/light.template/
+"""
+import logging
+import asyncio
+
+import voluptuous as vol
+
+from homeassistant.core import callback
+from homeassistant.components.light import (
+    ATTR_BRIGHTNESS, ENTITY_ID_FORMAT, Light, SUPPORT_BRIGHTNESS,
+    PLATFORM_SCHEMA)
+from homeassistant.const import (
+    CONF_VALUE_TEMPLATE, ATTR_ENTITY_ID, ATTR_FRIENDLY_NAME, STATE_ON,
+    STATE_OFF, EVENT_HOMEASSISTANT_START
+)
+from homeassistant.helpers.config_validation import PLATFORM_SCHEMA
+from homeassistant.exceptions import TemplateError
+import homeassistant.helpers.config_validation as cv
+from homeassistant.helpers.entity import async_generate_entity_id
+from homeassistant.helpers.event import async_track_state_change
+from homeassistant.helpers.restore_state import async_get_last_state
+from homeassistant.helpers.script import Script
+
+_LOGGER = logging.getLogger(__name__)
+_VALID_STATES = [STATE_ON, STATE_OFF, 'true', 'false']
+
+CONF_LIGHTS = 'lights'
+ON_ACTION = 'turn_on'
+OFF_ACTION = 'turn_off'
+LEVEL_ACTION = 'set_level'
+LEVEL_TEMPLATE = 'level_template'
+
+
+LIGHT_SCHEMA = vol.Schema({
+    vol.Required(ON_ACTION): cv.SCRIPT_SCHEMA,
+    vol.Required(OFF_ACTION): cv.SCRIPT_SCHEMA,
+    vol.Optional(CONF_VALUE_TEMPLATE, default=None): cv.template,
+    vol.Optional(LEVEL_ACTION, default=None): cv.SCRIPT_SCHEMA,
+    vol.Optional(LEVEL_TEMPLATE, default=None): cv.template,
+    vol.Optional(ATTR_FRIENDLY_NAME, default=None): cv.string,
+    vol.Optional(ATTR_ENTITY_ID): cv.entity_ids
+})
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_LIGHTS): vol.Schema({cv.slug: LIGHT_SCHEMA}),
+})
+
+@asyncio.coroutine
+def async_setup_platform(hass, config, async_add_devices, discovery_info=None):
+    """Set up Template Lights."""
+    lights = []
+    
+    for device, device_config in config[CONF_LIGHTS].items():
+        friendly_name = device_config.get(ATTR_FRIENDLY_NAME, device)
+        state_template = device_config[CONF_VALUE_TEMPLATE]
+        on_action = device_config[ON_ACTION]
+        off_action = device_config[OFF_ACTION]
+        level_action = device_config[LEVEL_ACTION]
+        level_template = device_config[LEVEL_TEMPLATE]
+        entity_ids = []
+        if state_template is not None:
+            entity_ids = (device_config.get(ATTR_ENTITY_ID) or
+                          state_template.extract_entities())
+            state_template.hass = hass
+
+        lights.append(
+            LightTemplate(
+                hass, device, friendly_name, state_template,
+                on_action, off_action, level_action, level_template,
+                entity_ids)
+        )
+
+    if not lights:
+        _LOGGER.error("No lights added");
+        return False
+    
+    async_add_devices(lights, True)
+    return True
+
+
+class LightTemplate(Light):
+    """Representation of a templated Light, including dimmable."""
+
+    def __init__(self, hass, device_id, friendly_name, state_template,
+                 on_action, off_action, level_action, level_template,
+                 entity_ids):
+        """Initialize the light."""
+        self.hass = hass
+        self.entity_id = async_generate_entity_id(
+            ENTITY_ID_FORMAT, device_id, hass=hass)
+        self._name = friendly_name
+        self._template = state_template
+        self._on_script = Script(hass, on_action)
+        self._off_script = Script(hass, off_action)
+        self._level_script = Script(hass, level_action)
+        self._level_template = level_template
+        self._state = False
+        self._brightness = 0
+        self._entities = entity_ids
+
+        if self._template is not None:
+          self._template.hass = self.hass
+        if self._level_template is not None:
+          self._level_template.hass = self.hass
+
+    @asyncio.coroutine
+    def async_added_to_hass(self):
+        """Register callbacks."""
+        state = yield from async_get_last_state(self.hass, self.entity_id)
+        if state:
+            self._state = state.state == STATE_ON
+
+        @callback
+        def template_switch_state_listener(entity, old_state, new_state):
+            """Handle target device state changes."""
+            self.hass.async_add_job(self.async_update_ha_state(True))
+
+        @callback
+        def template_switch_startup(event):
+            """Update template on startup."""
+            async_track_state_change(
+                self.hass, self._entities, template_switch_state_listener)
+
+            self.hass.async_add_job(self.async_update_ha_state(True))
+
+        self.hass.bus.async_listen_once(
+            EVENT_HOMEASSISTANT_START, template_switch_startup)
+
+    @property
+    def brightness(self):
+        """Return the brightness of the light."""
+        if self._level_template is None:
+            return None
+        return self._brightness
+
+    @property
+    def supported_features(self):
+        """Flag supported features."""
+        if self._level_script is not None: 
+            return SUPPORT_BRIGHTNESS
+
+        return 0
+
+    @asyncio.coroutine
+    def async_turn_on(self, **kwargs):
+        """Turn the light on."""
+        if ATTR_BRIGHTNESS in kwargs and self._level_script:
+            self.hass.async_add_job(self._level_script.async_run(
+                {"brightness": kwargs[ATTR_BRIGHTNESS]}))
+        else:
+            self.hass.async_add_job(self._on_script.async_run())
+
+        self._state = True
+        self.schedule_update_ha_state(True)
+
+    @asyncio.coroutine
+    def async_turn_off(self, **kwargs):
+        """Turn the light off."""
+        self.hass.async_add_job(self._off_script.async_run())
+        self._state = False
+        self.schedule_update_ha_state()
+
+    @property
+    def is_on(self):
+        """Return true if device is on."""
+        return self._state
+
+    @asyncio.coroutine
+    def async_update(self):
+        """Update the state from the template."""
+        try:
+            if self._template is not None:
+                state = self._template.async_render().lower()
+
+                if state in _VALID_STATES:
+                    self._state = state in ('true', STATE_ON)
+                else:
+                    _LOGGER.error(
+                        'Received invalid switch is_on state: %s. Expected: %s',
+                        state, ', '.join(_VALID_STATES))
+                    self._state = None
+
+            if self._level_template is not None:
+                self._brightness = self._level_template.async_render()
+
+        except TemplateError as ex:
+            _LOGGER.error(ex)
+            self._state = None