Add wunderground module
This module tries to use as much of the same variable naming conventions that the ``weather`` module uses as possible, to make transitioning easier in the future in case we decide to make a base class for all modules which provide weather data. An API key is required to use this module, information on obtaining one can be found in the docstring.
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Erik Johnson
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i3pystatus/wunderground.py
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219
i3pystatus/wunderground.py
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from i3pystatus import IntervalModule
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from i3pystatus.core.util import user_open, internet, require
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from datetime import datetime
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from urllib.request import urlopen
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import json
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import re
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GEOLOOKUP_URL = 'http://api.wunderground.com/api/%s/geolookup%s/q/%s.json'
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STATION_LOOKUP_URL = 'http://api.wunderground.com/api/%s/conditions/q/%s.json'
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class Wunderground(IntervalModule):
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'''
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This module retrieves weather from the Weather Underground API.
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.. note::
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A Weather Underground API key is required to use this module, you can
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sign up for one for a developer API key free at
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https://www.wunderground.com/weather/api/
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A developer API key is allowed 500 queries per day.
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Valid values for ``location_code`` include:
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* **State/City_Name** - CA/San_Francisco
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* **Country/City** - France/Paris
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* **Geolocation by IP** - autoip
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* **Zip or Postal Code** - 60616
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* **ICAO Airport Code** - icao:LAX
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* **Latitude/Longitude** - 41.8301943,-87.6342619
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* **Personal Weather Station (PWS)** - pws:KILCHICA30
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When not using a PWS, the location will be queried, and the closest
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station will be used. When possible, it is recommended to use a PWS
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location, as this will result in fewer API calls.
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.. rubric:: Available formatters
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* `{city}` — Location of weather observation
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* `{conditon}` — Current condition (Rain, Snow, Overcast, etc.)
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* `{observation_time}` — Time of weather observation (supports strftime format flags)
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* `{current_temp}` — Current temperature, excluding unit
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* `{degrees}` — ``°C`` if ``units`` is set to ``metric``, otherwise ``°F``
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* `{feelslike}` — Wunderground "Feels Like" temperature, excluding unit
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* `{current_wind}` — Wind speed in mph/kph, excluding unit
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* `{current_wind_direction}` — Wind direction
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* `{current_wind_gust}` — Speed of wind gusts in mph/kph, excluding unit
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* `{pressure_in}` — Barometric pressure (in inches), excluding unit
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* `{pressure_mb}` — Barometric pressure (in millibars), excluding unit
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* `{pressure_trend}` — ``+`` (rising) or ``-`` (falling)
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* `{visibility}` — Visibility in mi/km, excluding unit
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* `{humidity}` — Current humidity, excluding percentage symbol
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* `{dewpoint}` — Dewpoint temperature, excluding unit
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* `{uv_index}` — UV Index
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'''
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interval = 300
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settings = (
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('api_key', 'Weather Underground API key'),
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('location_code', 'Location code from www.weather.com'),
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('units', 'Celsius (metric) or Fahrenheit (imperial)'),
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('use_pws', 'Set to False to use only airport stations'),
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('error_log', 'If set, tracebacks will be logged to this file'),
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'format',
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)
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required = ('api_key', 'location_code')
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api_key = None
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location_code = None
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units = "metric"
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format = "{current_temp}{degrees}"
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use_pws = True
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error_log = None
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station_id = None
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forecast_url = None
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on_leftclick = 'open_wunderground'
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def open_wunderground(self):
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'''
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Open the forecast URL, if one was retrieved
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'''
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if self.forecast_url and self.forecast_url != 'N/A':
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user_open(self.forecast_url)
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def api_request(self, url):
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'''
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Execute an HTTP POST to the specified URL and return the content
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'''
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with urlopen(url) as content:
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try:
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content_type = dict(content.getheaders())['Content-Type']
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charset = re.search(r'charset=(.*)', content_type).group(1)
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except AttributeError:
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charset = 'utf-8'
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response = json.loads(content.read().decode(charset))
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try:
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raise Exception(response['response']['error']['description'])
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except KeyError:
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pass
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return response
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def geolookup(self):
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'''
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Use the location_code to perform a geolookup and find the closest
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station. If the location is a pws or icao station ID, no lookup will be
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peformed.
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'''
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if self.station_id is None:
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try:
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for no_lookup in ('pws', 'icao'):
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sid = self.location_code.partition(no_lookup + ':')[-1]
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if sid:
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self.station_id = self.location_code
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return
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except AttributeError:
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# Numeric or some other type, either way we'll just stringify
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# it below and perform a lookup.
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pass
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extra_opts = '/pws:0' if not self.use_pws else ''
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api_url = GEOLOOKUP_URL % (self.api_key,
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extra_opts,
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self.location_code)
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response = self.api_request(api_url)
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station_type = 'pws' if self.use_pws else 'airport'
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try:
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stations = response['location']['nearby_weather_stations']
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nearest = stations[station_type]['station'][0]
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except (KeyError, IndexError):
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raise Exception('No locations matched location_code %s'
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% self.location_code)
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if self.use_pws:
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nearest_pws = nearest.get('id', '')
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if not nearest_pws:
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raise Exception('No id entry for station')
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self.station_id = 'pws:%s' % nearest_pws
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else:
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nearest_airport = nearest.get('icao', '')
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if not nearest_airport:
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raise Exception('No icao entry for station')
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self.station_id = 'icao:%s' % nearest_airport
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def query_station(self):
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'''
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Query a specific station
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'''
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# If necessary, do a geolookup to set the station_id
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self.geolookup()
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query_url = STATION_LOOKUP_URL % (self.api_key, self.station_id)
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try:
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response = self.api_request(query_url)['current_observation']
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self.forecast_url = response.pop('forecast_url', None)
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except KeyError:
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raise Exception('No weather data found for %s' % self.station_id)
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def _find(key, data=None):
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data = data or response
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return data.get(key, 'N/A')
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if self.units == 'metric':
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temp_unit = 'c'
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speed_unit = 'kph'
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distance_unit = 'km'
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else:
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temp_unit = 'f'
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speed_unit = 'mph'
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distance_unit = 'mi'
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try:
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observation_time = int(_find('observation_epoch'))
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except TypeError:
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observation_time = 0
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return dict(
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forecast_url=_find('forecast_url'),
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city=_find('city', response['observation_location']),
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condition=_find('weather'),
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observation_time=datetime.fromtimestamp(observation_time),
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current_temp=_find('temp_' + temp_unit),
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feelslike=_find('feelslike_' + temp_unit),
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current_wind=_find('wind_' + speed_unit),
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current_wind_direction=_find('wind_dir'),
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current_wind_gust=_find('wind_gust_' + speed_unit),
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pressure_in=_find('pressure_in'),
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pressure_mb=_find('pressure_mb'),
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pressure_trend=_find('pressure_trend'),
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visibility=_find('visibility_' + distance_unit),
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humidity=_find('relative_humidity').rstrip('%'),
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dewpoint=_find('dewpoint_' + temp_unit),
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uv_index=_find('uv'),
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)
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@require(internet)
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def run(self):
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try:
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result = self.query_station()
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except Exception as exc:
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if self.error_log:
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import traceback
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with open(self.error_log, 'a') as f:
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f.write('%s : An exception was raised:\n' %
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datetime.isoformat(datetime.now()))
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f.write(''.join(traceback.format_exc()))
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f.write(80 * '-' + '\n')
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raise
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result['degrees'] = '°%s' % ('C' if self.units == 'metric' else 'F')
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self.output = {
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"full_text": self.format.format(**result),
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# "color": self.color # TODO: add some sort of color effect
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}
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