Class: Ubea::CurrencyConverter::FreeCurrencyConverterAPI

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

Constant Summary collapse

URL = 
"http://www.freecurrencyconverterapi.com/api/v2/convert?q=%s_%s&compact=y".freeze

Class Method Summary collapse

Class Method Details

.get_json(url, from, to) ⇒ Object 



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# File 'lib/ubea/currency_converter.rb', line 77

def self.get_json(url, from, to)
  Retryable.retryable(tries: 3, sleep: 1) do
    json = open(url).read
    JSON.parse(json)["#{from}_#{to}"]["val"].to_s
  end
end

.get_rate(from, to) ⇒ Object 



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# File 'lib/ubea/currency_converter.rb', line 61

def self.get_rate(from, to)
  url = URL % [from, to]
  string = get_json(url, from, to)
  rate = BigDecimal.new(string)

  if rate <= 1E-3
    Log.warn "Cannot retrieve exchange rate for #{from}#{to}, not enough precision, using the opposite pair"

    url = URL % [to, from]
    string = get_json(url, to, from)
    rate = BigDecimal.new(1) / BigDecimal.new(string)
  end

  rate
end