Class: WeatherFetcher::Provider::WorldWeatherOnline

Inherits:
HtmlBasedProvider show all
Defined in:
lib/weather_fetcher/providers/html_based/world_weather_online.rb

Constant Summary

Constants inherited from HtmlBasedProvider

HtmlBasedProvider::TYPE, HtmlBasedProvider::USER_AGENT

Constants inherited from WeatherFetcher::Provider

HOUR, TYPE

Instance Attribute Summary

Attributes inherited from WeatherFetcher::Provider

#defs, #logger, #weathers

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from HtmlBasedProvider

#fetch_and_process_single, #fetch_url, #fetch_url_old

Methods inherited from WeatherFetcher::Provider

#fetch, #fetch_and_process_single, #provider_name, #provider_params, short_class_name, #short_class_name, #store_city_definition, #store_time_costs, #unix_time_today

Constructor Details

#initialize(*args) ⇒ WorldWeatherOnline

Create an instance, definitions can be set here



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# File 'lib/weather_fetcher/providers/html_based/world_weather_online.rb', line 27

def initialize(*args)
  super(*args)

  # set api key if exists
  self.defs.each do |d|
    if d and d[:classes] and d[:classes][self.class.provider_name] and d[:classes][self.class.provider_name][:key]
      self.class.api = d[:classes][self.class.provider_name][:key]
    end
  end
end

Class Method Details

.api ⇒ Object 



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# File 'lib/weather_fetcher/providers/html_based/world_weather_online.rb', line 21

def self.api
  return nil unless defined?(@@api)
  @@api
end

.api=(_api) ⇒ Object

This provider required API key



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# File 'lib/weather_fetcher/providers/html_based/world_weather_online.rb', line 17

def self.api=(_api)
  @@api = _api unless _api.to_s == ""
end

.provider_name ⇒ Object 



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# File 'lib/weather_fetcher/providers/html_based/world_weather_online.rb', line 7

def self.provider_name
  "WorldWeatherOnline"
end

.weather_updated_every ⇒ Object

How often weather is updated



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# File 'lib/weather_fetcher/providers/html_based/world_weather_online.rb', line 12

def self.weather_updated_every
  12*HOUR - 240
end

Instance Method Details

#can_fetch?(p) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/weather_fetcher/providers/html_based/world_weather_online.rb', line 43

def can_fetch?(p)
  return false if not defined? @@api

  begin
    url(p).nil? == false
  rescue
    false
  end
end

#process(string) ⇒ Object 



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# File 'lib/weather_fetcher/providers/html_based/world_weather_online.rb', line 53

def process(string)
  result = JSON.parse(string)

  # weather archives as processing output
  weather_archives = Array.new

  # fix for empty response
  return if result.nil? or result["data"].nil? or result["data"]["current_condition"].nil?

  # current conditions
  current = result["data"]["current_condition"].first
  current_time = Time.create_time_from_string_12_utc(nil, current["observation_time"])

  h = process_node(current)
  hc = h.clone.merge(
    {
      :wwo_type => :current,
      :time_created => Time.now,
      :time_from => current_time - 3600,
      :time_to => current_time
    }
  )
  weather_archives << hc

  # prediction
  predictions = result["data"]["weather"]
  # example, there is no prediction on Antarctica
  if predictions and predictions.kind_of?(Array)
    predictions.each do |p|
      h = process_node(p)

      # is always 0
      [:pressure, :cloud_cover, :humidity, :visibility].each do |k|
        h.delete(k)
      end

      # create 2 records using tempMinC and tempMaxC
      hl = h.clone.merge(
        {
          :wwo_type => :prediction_temp_low,
          :time_created => Time.now,
          :time_from => Time.create_time_from_string(p["date"], "0:00") - 4 * 3600,
          :time_to => Time.create_time_from_string(p["date"], "0:00") + 8 * 3600,
          :temperature => p["tempMinC"].to_i
        }
      )
      weather_archives << hl

      # and high
      hh = h.clone.merge(
        {
          :wwo_type => :prediction_temp_high,
          :time_created => Time.now,
          :time_from => Time.create_time_from_string(p["date"], "0:00") + 8 * 3600,
          :time_to => Time.create_time_from_string(p["date"], "0:00") + 20 * 3600,
          :temperature => p["tempMaxC"].to_i
        }
      )
      weather_archives << hh

    end
  end

  return WeatherData.factory(weather_archives)

end

#process_node(node) ⇒ Object

Process json node to Hash for AR



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# File 'lib/weather_fetcher/providers/html_based/world_weather_online.rb', line 122

def process_node(node)
  # http://www.worldweatheronline.com/marine-weather-api.aspx
  return {
    :temperature => node["temp_C"].to_i,
    :wind => node["windspeedKmph"].to_f / 3.6,
    :pressure => node["pressure"].to_f,
    :rain => node["precipMM"].to_f,
    :snow => nil,
    :provider => self.class.provider_name,

    :cloud_cover => node["cloudcover"].to_f,
    :humidity => node["humidity"].to_f,
    :visibility => node["visibility"].to_f,
  }
end

#url(p) ⇒ Object

Url for current provider



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# File 'lib/weather_fetcher/providers/html_based/world_weather_online.rb', line 39

def url(p)
  "http://api.worldweatheronline.com/free/v1/weather.ashx?q=#{p[:coords][:lat]},#{p[:coords][:lon]}&format=json&num_of_days=5&key=#{@@api}"
end