Add google maps travel time sensor (home-assistant#1987)

* Add travel time sensor

* Throttle update of Time travel sensor

* Rename travel time to google travel time, validate the api key

.coveragerc

@@ -150,6 +150,7 @@ omit =
     homeassistant/components/sensor/eliqonline.py
     homeassistant/components/sensor/forecast.py
     homeassistant/components/sensor/glances.py
+    homeassistant/components/sensor/google_travel_time.py
     homeassistant/components/sensor/gtfs.py
     homeassistant/components/sensor/loopenergy.py
     homeassistant/components/sensor/netatmo.py

homeassistant/components/sensor/google_travel_time.py

@@ -0,0 +1,117 @@
+"""
+Support for Google travel time sensors.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/sensor.google_travel_time/
+"""
+from datetime import datetime
+from datetime import timedelta
+import logging
+import voluptuous as vol
+
+from homeassistant.helpers.entity import Entity
+from homeassistant.const import CONF_API_KEY, TEMP_CELSIUS
+from homeassistant.util import Throttle
+
+_LOGGER = logging.getLogger(__name__)
+
+REQUIREMENTS = ['googlemaps==2.4.3']
+
+# Return cached results if last update was less then this time ago
+MIN_TIME_BETWEEN_UPDATES = timedelta(minutes=5)
+
+CONF_ORIGIN = 'origin'
+CONF_DESTINATION = 'destination'
+CONF_TRAVEL_MODE = 'travel_mode'
+
+PLATFORM_SCHEMA = vol.Schema({
+    vol.Required('platform'): 'google_travel_time',
+    vol.Required(CONF_API_KEY): vol.Coerce(str),
+    vol.Required(CONF_ORIGIN): vol.Coerce(str),
+    vol.Required(CONF_DESTINATION): vol.Coerce(str),
+    vol.Optional(CONF_TRAVEL_MODE, default='driving'):
+        vol.In(["driving", "walking", "bicycling", "transit"])
+})
+
+
+def setup_platform(hass, config, add_devices_callback, discovery_info=None):
+    """Setup the travel time platform."""
+    # pylint: disable=too-many-locals
+
+    is_metric = (hass.config.temperature_unit == TEMP_CELSIUS)
+    api_key = config.get(CONF_API_KEY)
+    origin = config.get(CONF_ORIGIN)
+    destination = config.get(CONF_DESTINATION)
+    travel_mode = config.get(CONF_TRAVEL_MODE)
+
+    sensor = GoogleTravelTimeSensor(api_key, origin, destination,
+                                    travel_mode, is_metric)
+
+    if sensor.valid_api_connection:
+        add_devices_callback([sensor])
+
+
+class GoogleTravelTimeSensor(Entity):
+    """Representation of a tavel time sensor."""
+
+    # pylint: disable=too-many-arguments
+    def __init__(self, api_key, origin, destination, travel_mode, is_metric):
+        """Initialize the sensor."""
+        if is_metric:
+            self._unit = 'metric'
+        else:
+            self._unit = 'imperial'
+        self._origin = origin
+        self._destination = destination
+        self._travel_mode = travel_mode
+        self._matrix = None
+        self.valid_api_connection = True
+
+        import googlemaps
+        self._client = googlemaps.Client(api_key, timeout=10)
+        try:
+            self.update()
+        except googlemaps.exceptions.ApiError as exp:
+            _LOGGER .error(exp)
+            self.valid_api_connection = False
+            return
+
+    @property
+    def state(self):
+        """Return the state of the sensor."""
+        return self._matrix['rows'][0]['elements'][0]['duration']['value']/60.0
+
+    @property
+    def name(self):
+        """Get the name of the sensor."""
+        return "Google Travel time"
+
+    @property
+    def device_state_attributes(self):
+        """Return the state attributes."""
+        res = self._matrix.copy()
+        del res['rows']
+        _data = self._matrix['rows'][0]['elements'][0]
+        if 'duration_in_traffic' in _data:
+            res['duration_in_traffic'] = _data['duration_in_traffic']['text']
+        if 'duration' in _data:
+            res['duration'] = _data['duration']['text']
+        if 'distance' in _data:
+            res['distance'] = _data['distance']['text']
+        return res
+
+    @property
+    def unit_of_measurement(self):
+        """Return the unit this state is expressed in."""
+        return "min"
+
+    @Throttle(MIN_TIME_BETWEEN_UPDATES)
+    def update(self):
+        """Get the latest data from Google."""
+        now = datetime.now()
+        self._matrix = self._client.distance_matrix(self._origin,
+                                                    self._destination,
+                                                    mode=self._travel_mode,
+                                                    units=self._unit,
+                                                    departure_time=now,
+                                                    traffic_model="optimistic")

requirements_all.txt

@@ -62,6 +62,9 @@ fuzzywuzzy==0.8.0
 # homeassistant.components.notify.gntp
 gntp==1.0.3
 
+# homeassistant.components.sensor.google_travel_time
+googlemaps==2.4.3
+
 # homeassistant.components.mqtt.server
 hbmqtt==0.6.3