Class: ECBRates

Inherits:
Object
  • Object
show all
Defined in:
lib/ecb_rates.rb

Constant Summary collapse

ECB_URL_DAILY =

URLs for daily/90 days/from 1999 response after calling ECB

'http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml'
ECB_URL_90 = 
'http://www.ecb.europa.eu/stats/eurofxref/eurofxref-hist-90d.xml'
ECB_URL_FROM_BEGINNING = 
'https://www.ecb.europa.eu/stats/eurofxref/eurofxref-hist.xml'

Class Method Summary collapse

Class Method Details

.convert(date) ⇒ Object

Convert date from parameters into a version, acceptable by ECB service



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# File 'lib/ecb_rates.rb', line 57

def convert date; date.is_a?(String) ? Date.parse(date).to_s : date.to_s end

.get_rate_for(currency, converted_date) ⇒ Object

Parse xml response from ECB



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# File 'lib/ecb_rates.rb', line 32

def get_rate_for currency, converted_date
  rates_for_period = Hash.from_xml(get_rates_from_ecb)
  rates_for_chosed_date = rates_for_period["Envelope"]["Cube"]["Cube"].detect { |h| h["time"] == converted_date }
  if rates_for_chosed_date
    rate_with_currency = rates_for_chosed_date["Cube"].detect { |h| h["currency"] == currency }
    if rate_with_currency && rate_with_currency["rate"]
      rate_with_currency["rate"].to_f
    else
      puts "######## Service have no such currency. Check it please. ########"
    end
  else
    puts "######## No rate for this date. May be it was a weekend? ########"
  end
end

.get_rates_from_ecb ⇒ Object

Return xml with response from ECB



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# File 'lib/ecb_rates.rb', line 48

def get_rates_from_ecb
  uri = URI.parse ECB_URL_90
  http = Net::HTTP.new uri.host, uri.port
  request = Net::HTTP::Post.new uri.path
  response = http.request request
  response.body
end

.rates_for(currency, date = Date.today) ⇒ Object

Example:

>> ECBRates.rates_for 'usd', 14.09.2015
=> 1.2345

Arguments:

currency: (String)
date: (String)



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# File 'lib/ecb_rates.rb', line 22

def rates_for currency, date = Date.today
  converted_date = convert date
  if converted_date > Date.today.to_s
    puts "######## The date should be in the past. ########"
  else
    get_rate_for currency.upcase, converted_date
  end
end