Alert Component (#5201)

homeassistant/components/alert.py

@@ -0,0 +1,275 @@
+"""
+Support for repeating alerts when conditions are met.
+
+For more details about this component, please refer to the documentation at
+https://home-assistant.io/components/alert/
+"""
+import asyncio
+from datetime import datetime, timedelta
+import logging
+import os
+
+import voluptuous as vol
+
+from homeassistant.core import callback
+from homeassistant.config import load_yaml_config_file
+from homeassistant.const import (CONF_ENTITY_ID, STATE_IDLE, CONF_NAME,
+                                 CONF_STATE, STATE_ON, STATE_OFF,
+                                 SERVICE_TURN_ON, SERVICE_TURN_OFF,
+                                 SERVICE_TOGGLE, ATTR_ENTITY_ID)
+from homeassistant.helpers.entity import ToggleEntity
+from homeassistant.helpers import service, event
+from homeassistant.util.async import run_callback_threadsafe
+import homeassistant.helpers.config_validation as cv
+
+_LOGGER = logging.getLogger(__name__)
+
+DOMAIN = 'alert'
+ENTITY_ID_FORMAT = DOMAIN + '.{}'
+
+CONF_CAN_ACK = 'can_acknowledge'
+CONF_NOTIFIERS = 'notifiers'
+CONF_REPEAT = 'repeat'
+CONF_SKIP_FIRST = 'skip_first'
+
+ALERT_SCHEMA = vol.Schema({
+    vol.Required(CONF_NAME): cv.string,
+    vol.Required(CONF_ENTITY_ID): cv.entity_id,
+    vol.Required(CONF_STATE, default=STATE_ON): cv.string,
+    vol.Required(CONF_REPEAT): vol.All(cv.ensure_list, [vol.Coerce(float)]),
+    vol.Required(CONF_CAN_ACK, default=True): cv.boolean,
+    vol.Required(CONF_SKIP_FIRST, default=False): cv.boolean,
+    vol.Required(CONF_NOTIFIERS): cv.ensure_list})
+
+CONFIG_SCHEMA = vol.Schema({
+    DOMAIN: vol.Schema({
+        cv.slug: ALERT_SCHEMA,
+    }),
+}, extra=vol.ALLOW_EXTRA)
+
+
+ALERT_SERVICE_SCHEMA = vol.Schema({
+    vol.Required(ATTR_ENTITY_ID): cv.entity_ids,
+})
+
+
+def is_on(hass, entity_id):
+    """Return if the alert is firing and not acknowledged."""
+    return hass.states.is_state(entity_id, STATE_ON)
+
+
+def turn_on(hass, entity_id):
+    """Reset the alert."""
+    run_callback_threadsafe(hass.loop, async_turn_on, hass, entity_id)
+
+
+@callback
+def async_turn_on(hass, entity_id):
+    """Async reset the alert."""
+    data = {ATTR_ENTITY_ID: entity_id}
+    hass.async_add_job(
+        hass.services.async_call(DOMAIN, SERVICE_TURN_ON, data))
+
+
+def turn_off(hass, entity_id):
+    """Acknowledge alert."""
+    run_callback_threadsafe(hass.loop, async_turn_off, hass, entity_id)
+
+
+@callback
+def async_turn_off(hass, entity_id):
+    """Async acknowledge the alert."""
+    data = {ATTR_ENTITY_ID: entity_id}
+    hass.async_add_job(
+        hass.services.async_call(DOMAIN, SERVICE_TURN_OFF, data))
+
+
+def toggle(hass, entity_id):
+    """Toggle acknowledgement of alert."""
+    run_callback_threadsafe(hass.loop, async_toggle, hass, entity_id)
+
+
+@callback
+def async_toggle(hass, entity_id):
+    """Async toggle acknowledgement of alert."""
+    data = {ATTR_ENTITY_ID: entity_id}
+    hass.async_add_job(
+        hass.services.async_call(DOMAIN, SERVICE_TOGGLE, data))
+
+
+@asyncio.coroutine
+def async_setup(hass, config):
+    """Setup alert component."""
+    alerts = config.get(DOMAIN)
+    all_alerts = {}
+
+    @asyncio.coroutine
+    def async_handle_alert_service(service_call):
+        """Handle calls to alert services."""
+        alert_ids = service.extract_entity_ids(hass, service_call)
+
+        for alert_id in alert_ids:
+            alert = all_alerts[alert_id]
+            if service_call.service == SERVICE_TURN_ON:
+                yield from alert.async_turn_on()
+            elif service_call.service == SERVICE_TOGGLE:
+                yield from alert.async_toggle()
+            else:
+                yield from alert.async_turn_off()
+
+    # setup alerts
+    for entity_id, alert in alerts.items():
+        entity = Alert(hass, entity_id,
+                       alert[CONF_NAME], alert[CONF_ENTITY_ID],
+                       alert[CONF_STATE], alert[CONF_REPEAT],
+                       alert[CONF_SKIP_FIRST], alert[CONF_NOTIFIERS],
+                       alert[CONF_CAN_ACK])
+        all_alerts[entity.entity_id] = entity
+
+    # read descriptions
+    descriptions = yield from hass.loop.run_in_executor(
+        None, load_yaml_config_file, os.path.join(
+            os.path.dirname(__file__), 'services.yaml'))
+    descriptions = descriptions.get(DOMAIN, {})
+
+    # setup service calls
+    hass.services.async_register(
+        DOMAIN, SERVICE_TURN_OFF, async_handle_alert_service,
+        descriptions.get(SERVICE_TURN_OFF), schema=ALERT_SERVICE_SCHEMA)
+    hass.services.async_register(
+        DOMAIN, SERVICE_TURN_ON, async_handle_alert_service,
+        descriptions.get(SERVICE_TURN_ON), schema=ALERT_SERVICE_SCHEMA)
+    hass.services.async_register(
+        DOMAIN, SERVICE_TOGGLE, async_handle_alert_service,
+        descriptions.get(SERVICE_TOGGLE), schema=ALERT_SERVICE_SCHEMA)
+
+    tasks = [alert.async_update_ha_state() for alert in all_alerts.values()]
+    if tasks:
+        yield from asyncio.wait(tasks, loop=hass.loop)
+
+    return True
+
+
+class Alert(ToggleEntity):
+    """Representation of an alert."""
+
+    def __init__(self, hass, entity_id, name, watched_entity_id, state,
+                 repeat, skip_first, notifiers, can_ack):
+        """Initialize the alert."""
+        self.hass = hass
+        self._name = name
+        self._alert_state = state
+        self._skip_first = skip_first
+        self._notifiers = notifiers
+        self._can_ack = can_ack
+
+        self._delay = [timedelta(minutes=val) for val in repeat]
+        self._next_delay = 0
+
+        self._firing = False
+        self._ack = False
+        self._cancel = None
+        self.entity_id = ENTITY_ID_FORMAT.format(entity_id)
+
+        event.async_track_state_change(hass, watched_entity_id,
+                                       self.watched_entity_change)
+
+    @property
+    def name(self):
+        """Return the name of the alert."""
+        return self._name
+
+    @property
+    def should_poll(self):
+        """HASS need not poll these entities."""
+        return False
+
+    @property
+    def state(self):
+        """Return the alert status."""
+        if self._firing:
+            if self._ack:
+                return STATE_OFF
+            return STATE_ON
+        return STATE_IDLE
+
+    @property
+    def hidden(self):
+        """Hide the alert when it is not firing."""
+        return not self._can_ack or not self._firing
+
+    @asyncio.coroutine
+    def watched_entity_change(self, entity, from_state, to_state):
+        """Determine if the alert should start or stop."""
+        _LOGGER.debug('Watched entity (%s) has changed.', entity)
+        if to_state.state == self._alert_state and not self._firing:
+            yield from self.begin_alerting()
+        if to_state.state != self._alert_state and self._firing:
+            yield from self.end_alerting()
+
+    @asyncio.coroutine
+    def begin_alerting(self):
+        """Begin the alert procedures."""
+        _LOGGER.debug('Beginning Alert: %s', self._name)
+        self._ack = False
+        self._firing = True
+        self._next_delay = 0
+
+        if not self._skip_first:
+            yield from self._notify()
+        else:
+            yield from self._schedule_notify()
+
+        self.hass.async_add_job(self.async_update_ha_state)
+
+    @asyncio.coroutine
+    def end_alerting(self):
+        """End the alert procedures."""
+        _LOGGER.debug('Ending Alert: %s', self._name)
+        self._cancel()
+        self._ack = False
+        self._firing = False
+        self.hass.async_add_job(self.async_update_ha_state)
+
+    @asyncio.coroutine
+    def _schedule_notify(self):
+        """Schedule a notification."""
+        delay = self._delay[self._next_delay]
+        next_msg = datetime.now() + delay
+        self._cancel = \
+            event.async_track_point_in_time(self.hass, self._notify, next_msg)
+        self._next_delay = min(self._next_delay + 1, len(self._delay) - 1)
+
+    @asyncio.coroutine
+    def _notify(self, *args):
+        """Send the alert notification."""
+        if not self._firing:
+            return
+
+        if not self._ack:
+            _LOGGER.info('Alerting: %s', self._name)
+            for target in self._notifiers:
+                yield from self.hass.services.async_call(
+                    'notify', target, {'message': self._name})
+        yield from self._schedule_notify()
+
+    @asyncio.coroutine
+    def async_turn_on(self):
+        """Async Unacknowledge alert."""
+        _LOGGER.debug('Reset Alert: %s', self._name)
+        self._ack = False
+        yield from self.async_update_ha_state()
+
+    @asyncio.coroutine
+    def async_turn_off(self):
+        """Async Acknowledge alert."""
+        _LOGGER.debug('Acknowledged Alert: %s', self._name)
+        self._ack = True
+        yield from self.async_update_ha_state()
+
+    @asyncio.coroutine
+    def async_toggle(self):
+        """Async toggle alert."""
+        if self._ack:
+            return self.async_turn_on()
+        return self.async_turn_off()