public override Empty Sell(SellInput input)
{
Assert(IsValidSymbol(input.Symbol), "Invalid symbol.");
var fromConnector = State.Connectors[input.Symbol];
Assert(fromConnector != null, "Can't find connector.");
var toConnector = State.Connectors[State.BaseTokenSymbol.Value];
var amountToReceive = BancorHelpers.GetReturnFromPaid(
GetSelfBalance(fromConnector), GetWeight(fromConnector),
GetSelfBalance(toConnector), GetWeight(toConnector),
input.Amount
);
var fee = Convert.ToInt64(amountToReceive * GetFeeRate());
var amountToReceiveLessFee = amountToReceive.Sub(fee);
Assert(input.ReceiveLimit == 0 || amountToReceiveLessFee >= input.ReceiveLimit, "Price not good.");
// Pay fee
if (fee > 0)
{
State.TokenContract.Transfer.Send(
new TransferInput()
{
Symbol = State.BaseTokenSymbol.Value,
To = State.FeeReceiverAddress.Value,
Amount = fee
});
}
// Transafer base token
State.TokenContract.Transfer.Send(
new TransferInput()
{
Symbol = State.BaseTokenSymbol.Value,
To = Context.Sender,
Amount = amountToReceiveLessFee
});
// Transafer sold token
State.TokenContract.TransferFrom.Send(
new TransferFromInput()
{
Symbol = input.Symbol,
From = Context.Sender,
To = Context.Self,
Amount = input.Amount
});
Context.Fire(new TokenSold()
{
Symbol = input.Symbol,
SoldAmount = input.Amount,
BaseAmount = amountToReceive,
FeeAmount = fee
});
return(new Empty());
}
private long SellOperation(long paidRes)
{
var getReturnFromPaid = BancorHelpers.GetReturnFromPaid(
_ramConnector.VirtualBalance, Decimal.Parse(_ramConnector.Weight),
_elfConnector.VirtualBalance, Decimal.Parse(_elfConnector.Weight),
paidRes);
return(getReturnFromPaid);
}
public void GetAmountToPay_GetReturnFromPaid_Failed()
{
//fromConnectorBalance <= 0
Should.Throw <InvalidValueException>(() => BancorHelpers.GetAmountToPayFromReturn(0, 1000, 1000, 1000, 1000));
//paidAmount <= 0
Should.Throw <InvalidValueException>(() => BancorHelpers.GetAmountToPayFromReturn(1000, 1000, 1000, 1000, 0));
//toConnectorBalance <= 0
Should.Throw <InvalidValueException>(() => BancorHelpers.GetReturnFromPaid(1000, 1000, 0, 1000, 1000));
//amountToReceive <= 0
Should.Throw <InvalidValueException>(() => BancorHelpers.GetReturnFromPaid(1000, 1000, 1000, 1000, 0));
}
