"""
Support for Forecast.io weather service.
For more details about this platform, please refer to the documentation at
https://home-assistant.io/components/sensor.forecast/
"""
import logging
from datetime import timedelta
from requests.exceptions import ConnectionError as ConnectError, \
HTTPError, Timeout
from homeassistant.components.sensor import DOMAIN
from homeassistant.const import CONF_API_KEY, TEMP_CELSIUS
from homeassistant.helpers import validate_config
from homeassistant.helpers.entity import Entity
from homeassistant.util import Throttle
REQUIREMENTS = ['python-forecastio==1.3.4']
_LOGGER = logging.getLogger(__name__)
# Sensor types are defined like so:
# Name, si unit, us unit, ca unit, uk unit, uk2 unit
SENSOR_TYPES = {
'summary': ['Summary', None, None, None, None, None],
'minutely_summary': ['Minutely Summary', None, None, None, None, None],
'hourly_summary': ['Hourly Summary', None, None, None, None, None],
'daily_summary': ['Daily Summary', None, None, None, None, None],
'icon': ['Icon', None, None, None, None, None],
'nearest_storm_distance': ['Nearest Storm Distance',
'km', 'm', 'km', 'km', 'm'],
'nearest_storm_bearing': ['Nearest Storm Bearing',
'°', '°', '°', '°', '°'],
'precip_type': ['Precip', None, None, None, None, None],
'precip_intensity': ['Precip Intensity', 'mm', 'in', 'mm', 'mm', 'mm'],
'precip_probability': ['Precip Probability', '%', '%', '%', '%', '%'],
'temperature': ['Temperature', '°C', '°F', '°C', '°C', '°C'],
'apparent_temperature': ['Apparent Temperature',
'°C', '°F', '°C', '°C', '°C'],
'dew_point': ['Dew point', '°C', '°F', '°C', '°C', '°C'],
'wind_speed': ['Wind Speed', 'm/s', 'mph', 'km/h', 'mph', 'mph'],
'wind_bearing': ['Wind Bearing', '°', '°', '°', '°', '°'],
'cloud_cover': ['Cloud Coverage', '%', '%', '%', '%', '%'],
'humidity': ['Humidity', '%', '%', '%', '%', '%'],
'pressure': ['Pressure', 'mbar', 'mbar', 'mbar', 'mbar', 'mbar'],
'visibility': ['Visibility', 'km', 'm', 'km', 'km', 'm'],
'ozone': ['Ozone', 'DU', 'DU', 'DU', 'DU', 'DU'],
}
# Return cached results if last scan was less then this time ago.
MIN_TIME_BETWEEN_UPDATES = timedelta(seconds=120)
def setup_platform(hass, config, add_devices, discovery_info=None):
"""Setup the Forecast.io sensor."""
# Validate the configuration
if None in (hass.config.latitude, hass.config.longitude):
_LOGGER.error("Latitude or longitude not set in Home Assistant config")
return False
elif not validate_config({DOMAIN: config},
{DOMAIN: [CONF_API_KEY]}, _LOGGER):
return False
if 'units' in config:
units = config['units']
elif hass.config.temperature_unit == TEMP_CELSIUS:
units = 'si'
else:
units = 'us'
# Create a data fetcher to support all of the configured sensors. Then make
# the first call to init the data and confirm we can connect.
try:
forecast_data = ForeCastData(
config.get(CONF_API_KEY, None), hass.config.latitude,
hass.config.longitude, units)
forecast_data.update_currently()
except ValueError as error:
_LOGGER.error(error)
return False
# Initialize and add all of the sensors.
sensors = []
for variable in config['monitored_conditions']:
if variable in SENSOR_TYPES:
sensors.append(ForeCastSensor(forecast_data, variable))
else:
_LOGGER.error('Sensor type: "%s" does not exist', variable)
add_devices(sensors)
# pylint: disable=too-few-public-methods
class ForeCastSensor(Entity):
"""Implementation of a Forecast.io sensor."""
def __init__(self, forecast_data, sensor_type):
"""Initialize the sensor."""
self.client_name = 'Weather'
self._name = SENSOR_TYPES[sensor_type][0]
self.forecast_data = forecast_data
self.type = sensor_type
self._state = None
self._unit_of_measurement = None
self.update()
@property
def name(self):
"""Return the name of the sensor."""
return '{} {}'.format(self.client_name, self._name)
@property
def state(self):
"""Return the state of the sensor."""
return self._state
@property
def unit_of_measurement(self):
"""Return the unit of measurement of this entity, if any."""
return self._unit_of_measurement
@property
def unit_system(self):
"""Return the unit system of this entity."""
return self.forecast_data.unit_system
def update_unit_of_measurement(self):
"""Update units based on unit system."""
unit_index = {
'si': 1,
'us': 2,
'ca': 3,
'uk': 4,
'uk2': 5
}.get(self.unit_system, 1)
self._unit_of_measurement = SENSOR_TYPES[self.type][unit_index]
def update(self):
"""Get the latest data from Forecast.io and updates the states."""
# Call the API for new forecast data. Each sensor will re-trigger this
# same exact call, but thats fine. We cache results for a short period
# of time to prevent hitting API limits. Note that forecast.io will
# charge users for too many calls in 1 day, so take care when updating.
self.forecast_data.update()
self.update_unit_of_measurement()
if self.type == 'minutely_summary':
self.forecast_data.update_minutely()
minutely = self.forecast_data.data_minutely
self._state = getattr(minutely, 'summary', '')
elif self.type == 'hourly_summary':
self.forecast_data.update_hourly()
hourly = self.forecast_data.data_hourly
self._state = getattr(hourly, 'summary', '')
elif self.type == 'daily_summary':
self.forecast_data.update_daily()
daily = self.forecast_data.data_daily
self._state = getattr(daily, 'summary', '')
else:
self.forecast_data.update_currently()
currently = self.forecast_data.data_currently
self._state = self.get_currently_state(currently)
def get_currently_state(self, data):
"""
Helper function that returns a new state based on the type.
If the sensor type is unknown, the current state is returned.
"""
lookup_type = convert_to_camel(self.type)
state = getattr(data, lookup_type, 0)
# Some state data needs to be rounded to whole values or converted to
# percentages
if self.type in ['precip_probability', 'cloud_cover', 'humidity']:
return round(state * 100, 1)
elif (self.type in ['dew_point', 'temperature', 'apparent_temperature',
'pressure', 'ozone']):
return round(state, 1)
return state
def convert_to_camel(data):
"""
Convert snake case (foo_bar_bat) to camel case (fooBarBat).
This is not pythonic, but needed for certain situations
"""
components = data.split('_')
return components[0] + "".join(x.title() for x in components[1:])
class ForeCastData(object):
"""Gets the latest data from Forecast.io."""
# pylint: disable=too-many-instance-attributes
def __init__(self, api_key, latitude, longitude, units):
"""Initialize the data object."""
self._api_key = api_key
self.latitude = latitude
self.longitude = longitude
self.units = units
self.data = None
self.unit_system = None
self.data_currently = None
self.data_minutely = None
self.data_hourly = None
self.data_daily = None
self.update()
@Throttle(MIN_TIME_BETWEEN_UPDATES)
def update(self):
"""Get the latest data from Forecast.io."""
import forecastio
try:
self.data = forecastio.load_forecast(self._api_key,
self.latitude,
self.longitude,
units=self.units)
except (ConnectError, HTTPError, Timeout, ValueError) as error:
raise ValueError("Unable to init Forecast.io. - %s", error)
self.unit_system = self.data.json['flags']['units']
@Throttle(MIN_TIME_BETWEEN_UPDATES)
def update_currently(self):
"""Update currently data."""
self.data_currently = self.data.currently()
@Throttle(MIN_TIME_BETWEEN_UPDATES)
def update_minutely(self):
"""Update minutely data."""
self.data_minutely = self.data.minutely()
@Throttle(MIN_TIME_BETWEEN_UPDATES)
def update_hourly(self):
"""Update hourly data."""
self.data_hourly = self.data.hourly()
@Throttle(MIN_TIME_BETWEEN_UPDATES)
def update_daily(self):
"""Update daily data."""
self.data_daily = self.data.daily()