Class: Money::Bank::MNB

Inherits:
VariableExchange
  • Object
show all
Defined in:
lib/money/bank/mnb.rb

Constant Summary collapse

WSDL_URL = 
'http://www.mnb.hu/arfolyamok.asmx?WSDL'
VERSION = 
File.read(File.expand_path('../../../VERSION', File.dirname(__FILE__)))

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#rates ⇒ Object (readonly)

Returns the value of attribute rates.



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# File 'lib/money/bank/mnb.rb', line 12

def rates
  @rates
end

Instance Method Details

#currencies ⇒ Object 



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# File 'lib/money/bank/mnb.rb', line 73

def currencies
  @currencies ||= []
  return @currencies unless @currencies.empty?

  doc = Nokogiri::XML.parse fetch_currencies_from_wsdl
  @currencies = doc.css('Curr').collect(&:text)
  @currencies << 'HUF'
  
  @currencies
end

#fetch_currencies_from_wsdl ⇒ Object

Raises:

  • (UnknownRate) 


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# File 'lib/money/bank/mnb.rb', line 96

def fetch_currencies_from_wsdl
  rsp = mnb_client.call :get_info

  raise UnknownRate, "Bank returned with an error response" unless rsp.success?

  rsp.body[:get_info_response][:get_info_result]
end

#fetch_rate(from, to) ⇒ Object

Raises:

  • (UnknownRate) 


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# File 'lib/money/bank/mnb.rb', line 38

def fetch_rate(from, to)
  from, to = Currency.wrap(from).iso_code.to_s, Currency.wrap(to).iso_code.to_s
  
  # Providing usable error messages
  raise UnknownRate, "Source currency '#{from}' is not known by this module" unless currencies.include?(from)
  raise UnknownRate, "Target currency '#{to}' is not known by this module" unless currencies.include?(to)
  
  rsp = fetch_rates_from_wsdl

  doc = Nokogiri::XML.parse(rsp)

  ## Rates are specified in HUF, so we have to lookup both side before convert
  ## If any currency is HUF then it will be constant 1
  from_rate = from == 'HUF' ? 1 : 0
  to_rate = to == 'HUF' ? 1 : 0

  doc.css('Rate').each do |rate|
    curr = rate['curr']
    next unless [from, to].include?(curr)

    ## XXX Bank provides exchange rates in hungarian number notation form!
    value = rate.text.sub(',', '.').to_f

    unit = rate['unit'].to_i

    if curr == from
      from_rate = value / unit
    else
      to_rate = value / unit
    end
  end
  
  from_rate / to_rate
end

#fetch_rates_from_wsdl ⇒ Object

Raises:

  • (UnknownRate) 


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# File 'lib/money/bank/mnb.rb', line 88

def fetch_rates_from_wsdl
  rsp = mnb_client.call :get_current_exchange_rates

  raise UnknownRate, "Bank returned with an error response" unless rsp.success?
  
  rsp.body[:get_current_exchange_rates_response][:get_current_exchange_rates_result]
end

#flush_rate(from, to) ⇒ Object 



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# File 'lib/money/bank/mnb.rb', line 25

def flush_rate(from, to)
  key = rate_key_for(from, to)
  mutex.synchronize do
    @rates.delete(key)
  end
end

#flush_rates ⇒ Object 



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# File 'lib/money/bank/mnb.rb', line 19

def flush_rates
  mutex.synchronize do
    @rates = {}
  end
end

#get_rate(from, to) ⇒ Object 



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# File 'lib/money/bank/mnb.rb', line 32

def get_rate(from, to)
  mutex.synchronize do
    @rates[rate_key_for(from, to)] ||= fetch_rate(from, to)
  end
end

#mnb_client ⇒ Object 



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# File 'lib/money/bank/mnb.rb', line 84

def mnb_client
  @client ||= Savon.client(:wsdl => WSDL_URL, :log => false)
end

#setup ⇒ Object 



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# File 'lib/money/bank/mnb.rb', line 14

def setup
  HTTPI.log = false
  @rates = {}
end