lib/exchange_rate.py

   1 import decimal
   2 import httplib
   3 import json
   4
   5 class Exchanger:
   6
   7     def __init__(self, quote_currencies, refresh_balance):
   8         self.refresh_balance = refresh_balance
   9         self.quote_currencies = {}
  10
  11     def exchange(self, btc_amount, quote_currency):
  12         return btc_amount * self.quote_currencies[quote_currency]
  13
  14     def discovery(self):
  15         connection = httplib.HTTPSConnection('intersango.com')
  16         connection.request("GET", "/api/ticker.php")
  17         response = connection.getresponse()
  18         if response.status == 404:
  19             return
  20         response = json.loads(response.read())
  21         # 1 = BTC:GBP
  22         # 2 = BTC:EUR
  23         # 3 = BTC:USD
  24         # 4 = BTC:PLN
  25         try:
  26             self.quote_currencies["GBP"] = self.lookup_rate(response, 1)
  27             self.quote_currencies["EUR"] = self.lookup_rate(response, 2)
  28             self.quote_currencies["USD"] = self.lookup_rate(response, 3)
  29             self.refresh_balance()
  30         except KeyError:
  31             pass
  32
  33     def lookup_rate(self, response, quote_id):
  34         return decimal.Decimal(response[str(quote_id)]["last"])
  35
  36 if __name__ == "__main__":
  37     exch = Exchanger(("EUR", "USD", "GBP"))
  38     print exch.exchange(1, "EUR")
  39