Simple open_weather implementation - used to collect temperature data for Nest stats website until sep 2019 when Lennox system installed

open_weather.rb

require 'httparty'

def outside_temp_f zip
  # Only read the temp every ten minutes, or if no current-temperature-file established.
  #
  curr_temperature_fname = 'current-temperature-file'

  if File.exists? curr_temperature_fname
    age_in_seconds = DateTime.now.to_time.to_i - File.stat(curr_temperature_fname).mtime.to_time.to_i
    # Is file less than ten minutes old?
    if age_in_seconds < 600
      return File.read(curr_temperature_fname).strip.to_f
    end
  end


  uri = 'http://api.openweathermap.org/data/2.5/weather'
  appid = ENV['OPEN_WEATHER_APPID']
  response = HTTParty.get "#{uri}?APPID=#{appid}&zip=#{zip}"

  # Kelvin to Fahrenheit ...
  temp_f = (JSON.parse(response.body)['main']['temp'] * 1.8) - 459.67
  File.open(curr_temperature_fname, 'w') do |f|
    puts "#{DateTime.now} - initializing or updating current-temperature-file with '#{temp_f}'..."
    f.write temp_f.to_s
  end
  temp_f.to_f
end