public override Empty Sell(SellInput input)
{
var fromConnector = State.Connectors[input.Symbol];
Assert(fromConnector != null, "[Sell]Can't find from connector.");
Assert(fromConnector.IsPurchaseEnabled, "can't purchase");
var toConnector = State.Connectors[fromConnector.RelatedSymbol];
Assert(toConnector != null, "[Sell]Can't find to connector.");
var amountToReceive = BancorHelper.GetReturnFromPaid(
GetSelfBalance(fromConnector), GetWeight(fromConnector),
GetSelfBalance(toConnector), GetWeight(toConnector),
input.Amount
);
var fee = Convert.ToInt64(amountToReceive * GetFeeRate());
if (Context.Sender == Context.GetContractAddressByName(SmartContractConstants.TreasuryContractSystemName))
{
fee = 0;
}
var amountToReceiveLessFee = amountToReceive.Sub(fee);
Assert(input.ReceiveLimit == 0 || amountToReceiveLessFee >= input.ReceiveLimit, "Price not good.");
// Pay fee
if (fee > 0)
{
HandleFee(fee);
}
// Transfer base token
State.TokenContract.Transfer.Send(
new TransferInput
{
Symbol = State.BaseTokenSymbol.Value,
To = Context.Sender,
Amount = amountToReceive
});
State.DepositBalance[toConnector.Symbol] =
State.DepositBalance[toConnector.Symbol].Sub(amountToReceive);
// Transfer 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());
}
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());
}
