public override async Task <decimal> GetRewardForRedeemAsync(
decimal maxRewardPercent,
decimal maxRewardPercentInBase,
string feeCurrencyToBaseSymbol,
decimal feeCurrencyToBasePrice,
string feeCurrencySymbol = null,
decimal feeCurrencyPrice = 0,
CancellationToken cancellationToken = default)
{
var rewardForRedeemInEth = await base.GetRewardForRedeemAsync(
maxRewardPercent : maxRewardPercent,
maxRewardPercentInBase : maxRewardPercentInBase,
feeCurrencyToBaseSymbol : feeCurrencyToBaseSymbol,
feeCurrencyToBasePrice : feeCurrencyToBasePrice,
feeCurrencySymbol : feeCurrencySymbol,
feeCurrencyPrice : feeCurrencyPrice,
cancellationToken : cancellationToken);
if (feeCurrencySymbol == null || feeCurrencyPrice == 0)
{
return(0m);
}
return(AmountHelper.RoundDown(feeCurrencySymbol.IsBaseCurrency(Name)
? rewardForRedeemInEth / feeCurrencyPrice
: rewardForRedeemInEth *feeCurrencyPrice, DigitsMultiplier));
}
private decimal RequiredAmountInTokens(Swap swap, Erc20Config erc20)
{
var requiredAmountInERC20 = AmountHelper.QtyToSellAmount(swap.Side, swap.Qty, swap.Price, erc20.DigitsMultiplier);
// maker network fee
if (swap.MakerNetworkFee > 0 && swap.MakerNetworkFee < requiredAmountInERC20) // network fee size check
{
requiredAmountInERC20 += AmountHelper.RoundDown(swap.MakerNetworkFee, erc20.DigitsMultiplier);
}
return(requiredAmountInERC20);
}
public static decimal CalculateRewardForRedeem(
decimal redeemFee,
string redeemFeeCurrency,
decimal redeemFeeDigitsMultiplier,
decimal maxRewardPercent,
decimal maxRewardPercentValue,
string feeCurrencyToBaseSymbol,
decimal feeCurrencyToBasePrice,
decimal baseDigitsMultiplier = 2)
{
var redeemFeeInBase = AmountHelper.RoundDown(feeCurrencyToBaseSymbol.IsBaseCurrency(redeemFeeCurrency)
? redeemFee * feeCurrencyToBasePrice
: redeemFee / feeCurrencyToBasePrice, baseDigitsMultiplier);
var k = maxRewardPercentValue / (decimal)Math.Log((double)((1 - maxRewardPercent) / MaxRewardForRedeemDeviation));
var p = (1 - maxRewardPercent) / (decimal)Math.Exp((double)(redeemFeeInBase / k)) + maxRewardPercent;
return(AmountHelper.RoundDown(redeemFee * (1 + p), redeemFeeDigitsMultiplier));
}
protected virtual async Task <EthereumTransaction> CreatePaymentTxAsync(
Swap swap,
int lockTimeInSeconds,
CancellationToken cancellationToken = default)
{
var ethConfig = EthConfig;
Log.Debug("Create payment transaction from address {@address} for swap {@swapId}", swap.FromAddress, swap.Id);
var requiredAmountInEth = AmountHelper.QtyToSellAmount(swap.Side, swap.Qty, swap.Price, ethConfig.DigitsMultiplier);
// maker network fee
if (swap.MakerNetworkFee > 0 && swap.MakerNetworkFee < requiredAmountInEth) // network fee size check
{
requiredAmountInEth += AmountHelper.RoundDown(swap.MakerNetworkFee, ethConfig.DigitsMultiplier);
}
var refundTimeStampUtcInSec = new DateTimeOffset(swap.TimeStamp.ToUniversalTime().AddSeconds(lockTimeInSeconds)).ToUnixTimeSeconds();
var rewardForRedeemInEth = swap.PartyRewardForRedeem;
var walletAddress = await _account
.GetAddressAsync(swap.FromAddress, cancellationToken)
.ConfigureAwait(false);
var gasPrice = await ethConfig
.GetGasPriceAsync(cancellationToken)
.ConfigureAwait(false);
var balanceInEth = walletAddress.Balance;
Log.Debug("Available balance: {@balance}", balanceInEth);
var feeAmountInEth = rewardForRedeemInEth == 0
? ethConfig.InitiateFeeAmount(gasPrice)
: ethConfig.InitiateWithRewardFeeAmount(gasPrice);
if (balanceInEth < feeAmountInEth + requiredAmountInEth)
{
Log.Warning(
"Insufficient funds at {@address}. Balance: {@balance}, required: {@required}, " +
"feeAmount: {@feeAmount}, missing: {@result}.",
walletAddress.Address,
balanceInEth,
requiredAmountInEth,
feeAmountInEth,
balanceInEth - feeAmountInEth - requiredAmountInEth);
return(null);
}
var nonceResult = await((IEthereumBlockchainApi)ethConfig.BlockchainApi)
.GetTransactionCountAsync(walletAddress.Address, pending: false, cancellationToken)
.ConfigureAwait(false);
if (nonceResult.HasError)
{
Log.Error($"Getting nonce error: {nonceResult.Error.Description}");
return(null);
}
TransactionInput txInput;
var message = new InitiateFunctionMessage
{
HashedSecret = swap.SecretHash,
Participant = swap.PartyAddress,
RefundTimestamp = refundTimeStampUtcInSec,
AmountToSend = EthereumConfig.EthToWei(requiredAmountInEth),
FromAddress = walletAddress.Address,
GasPrice = EthereumConfig.GweiToWei(gasPrice),
Nonce = nonceResult.Value,
RedeemFee = EthereumConfig.EthToWei(rewardForRedeemInEth)
};
var initiateGasLimit = rewardForRedeemInEth == 0
? ethConfig.InitiateGasLimit
: ethConfig.InitiateWithRewardGasLimit;
message.Gas = await EstimateGasAsync(message, new BigInteger(initiateGasLimit))
.ConfigureAwait(false);
txInput = message.CreateTransactionInput(ethConfig.SwapContractAddress);
return(new EthereumTransaction(ethConfig.Name, txInput)
{
Type = BlockchainTransactionType.Output | BlockchainTransactionType.SwapPayment
});
}
public static Task <SwapPriceEstimation> EstimateSwapPriceAsync(
decimal amount,
AmountType amountType,
CurrencyConfig fromCurrency,
CurrencyConfig toCurrency,
IAccount account,
IAtomexClient atomexClient,
ISymbolsProvider symbolsProvider,
CancellationToken cancellationToken = default)
{
return(Task.Run(() =>
{
if (fromCurrency == null)
{
return null;
}
if (toCurrency == null)
{
return null;
}
var symbol = symbolsProvider
.GetSymbols(account.Network)
.SymbolByCurrencies(fromCurrency, toCurrency);
if (symbol == null)
{
return null;
}
var side = symbol.OrderSideForBuyCurrency(toCurrency);
var orderBook = atomexClient.GetOrderBook(symbol);
if (orderBook == null)
{
return null;
}
var baseCurrency = account.Currencies.GetByName(symbol.Base);
var isSoldAmount = amountType == AmountType.Sold;
var(estimatedOrderPrice, estimatedPrice) = orderBook.EstimateOrderPrices(
side: side,
amount: amount,
amountDigitsMultiplier: isSoldAmount
? fromCurrency.DigitsMultiplier
: toCurrency.DigitsMultiplier,
qtyDigitsMultiplier: baseCurrency.DigitsMultiplier,
amountType: amountType);
var(estimatedMaxFromAmount, estimatedMaxToAmount) = orderBook.EstimateMaxAmount(side, fromCurrency.DigitsMultiplier);
var isNoLiquidity = amount != 0 && estimatedOrderPrice == 0;
var oppositeAmount = isSoldAmount
? symbol.IsBaseCurrency(toCurrency.Name)
? estimatedPrice != 0
? AmountHelper.RoundDown(amount / estimatedPrice, toCurrency.DigitsMultiplier)
: 0m
: AmountHelper.RoundDown(amount * estimatedPrice, toCurrency.DigitsMultiplier)
: symbol.IsBaseCurrency(toCurrency.Name)
? AmountHelper.RoundDown(amount * estimatedPrice, fromCurrency.DigitsMultiplier)
: estimatedPrice != 0
? AmountHelper.RoundDown(amount / estimatedPrice, fromCurrency.DigitsMultiplier)
: 0m;
return new SwapPriceEstimation
{
FromAmount = isSoldAmount ? amount : oppositeAmount,
ToAmount = isSoldAmount ? oppositeAmount : amount,
OrderPrice = estimatedOrderPrice,
Price = estimatedPrice,
MaxFromAmount = estimatedMaxFromAmount,
MaxToAmount = estimatedMaxToAmount,
IsNoLiquidity = isNoLiquidity
};
}, cancellationToken));
}
