def get_context_data(self, **kwargs):
# validated by URL pattern
amount = Decimal(self.kwargs.pop("amount"))
depth = mtgox.market(USD).getDepth()
orders = self.get_orders(depth)
sought = Amount(amount, BTC)
obtained = Amount(0, BTC)
orders_from = []
order_idx = 0
# get all of the orders we could be purchasing from
while obtained < sought:
order = orders[order_idx]
xrt = order.exchange_rate
# we're always trying to buy/sell BTC, so make sure the amounts
# are consistent
order_btc_amount = xrt.convert(order.to_amount, BTC)
obtained = obtained + order_btc_amount
orders_from.append(order)
# get average of all orders from which the purchase will be constructed
# as a Decimal
avg = self.get_avg(orders=orders_from)
total = float(amount * avg)
# add commission
value = (total * settings.BTCX_COMMISSION) + total
ctx = {"rate": {"value": value, "currency": "USD", "amount": float(amount)}}
return ctx
def get_xrt(self):
xrt = mtgox.market(USD).getTicker().sell
# returns a Decimal type
return xrt.exchange_rate
