protected override async Task <IEnumerable <EthereumTransaction> > CreatePaymentTxsAsync(
Swap swap,
int lockTimeInSeconds,
CancellationToken cancellationToken = default)
{
var erc20 = Erc20;
Log.Debug("Create payment transactions for swap {@swapId}", swap.Id);
var requiredAmountInERC20 = AmountHelper.QtyToAmount(swap.Side, swap.Qty, swap.Price, erc20.DigitsMultiplier);
var refundTimeStampUtcInSec = new DateTimeOffset(swap.TimeStamp.ToUniversalTime().AddSeconds(lockTimeInSeconds)).ToUnixTimeSeconds();
var isInitTx = true;
var rewardForRedeemInERC20 = swap.PartyRewardForRedeem;
var unspentAddresses = (await Erc20Account
.GetUnspentAddressesAsync(cancellationToken)
.ConfigureAwait(false))
.ToList()
.SortList((a, b) => a.AvailableBalance().CompareTo(b.AvailableBalance()));
var transactions = new List <EthereumTransaction>();
foreach (var walletAddress in unspentAddresses)
{
Log.Debug("Create swap payment tx from address {@address} for swap {@swapId}", walletAddress.Address, swap.Id);
var balanceInEth = (await EthereumAccount
.GetAddressBalanceAsync(
address: walletAddress.Address,
cancellationToken: cancellationToken)
.ConfigureAwait(false))
.Available;
var balanceInERC20 = (await Erc20Account
.GetAddressBalanceAsync(
address: walletAddress.Address,
cancellationToken: cancellationToken)
.ConfigureAwait(false))
.Available;
Log.Debug("Available balance: {@balance}", balanceInERC20);
var feeAmountInEth = (isInitTx
? rewardForRedeemInERC20 == 0
? erc20.InitiateFeeAmount
: erc20.InitiateWithRewardFeeAmount
: erc20.AddFeeAmount) + erc20.ApproveFeeAmount;
if (balanceInEth - feeAmountInEth <= 0)
{
Log.Warning(
"Insufficient funds at {@address}. Balance: {@balance}, feeAmount: {@feeAmount}, result: {@result}.",
walletAddress.Address,
balanceInEth,
feeAmountInEth,
balanceInEth - feeAmountInEth);
continue;
}
var amountInERC20 = requiredAmountInERC20 > 0
? AmountHelper.DustProofMin(balanceInERC20, requiredAmountInERC20, erc20.DigitsMultiplier, erc20.DustDigitsMultiplier)
: 0;
requiredAmountInERC20 -= amountInERC20;
var nonceResult = await EthereumNonceManager.Instance
.GetNonceAsync(erc20, walletAddress.Address)
.ConfigureAwait(false);
if (nonceResult.HasError)
{
Log.Error("Nonce getting error with code {@code} and description {@description}",
nonceResult.Error.Code,
nonceResult.Error.Description);
return(null);
}
var nonce = nonceResult.Value;
var allowanceMessage = new ERC20AllowanceFunctionMessage()
{
Owner = walletAddress.Address,
Spender = erc20.SwapContractAddress,
FromAddress = walletAddress.Address
};
var allowance = await((IEthereumBlockchainApi)erc20.BlockchainApi)
.GetERC20AllowanceAsync(
erc20: erc20,
tokenAddress: erc20.ERC20ContractAddress,
allowanceMessage: allowanceMessage,
cancellationToken: cancellationToken)
.ConfigureAwait(false);
if (allowance.Value > 0)
{
transactions.Add(await CreateApproveTx(walletAddress, nonceResult.Value, 0)
.ConfigureAwait(false));
nonce += 1;
}
else
{
transactions.Add(new EthereumTransaction());
}
transactions.Add(await CreateApproveTx(walletAddress, nonce, erc20.TokensToTokenDigits(amountInERC20))
.ConfigureAwait(false));
nonce += 1;
TransactionInput txInput;
//actual transfer
if (isInitTx)
{
var initMessage = new ERC20InitiateFunctionMessage
{
HashedSecret = swap.SecretHash,
ERC20Contract = erc20.ERC20ContractAddress,
Participant = swap.PartyAddress,
RefundTimestamp = refundTimeStampUtcInSec,
Countdown = lockTimeInSeconds,
Value = erc20.TokensToTokenDigits(amountInERC20),
RedeemFee = erc20.TokensToTokenDigits(rewardForRedeemInERC20),
Active = true,
FromAddress = walletAddress.Address,
GasPrice = Atomex.Ethereum.GweiToWei(erc20.GasPriceInGwei),
Nonce = nonce
};
var initiateGasLimit = rewardForRedeemInERC20 == 0
? erc20.InitiateGasLimit
: erc20.InitiateWithRewardGasLimit;
initMessage.Gas = await EstimateGasAsync(initMessage, new BigInteger(initiateGasLimit))
.ConfigureAwait(false);
txInput = initMessage.CreateTransactionInput(erc20.SwapContractAddress);
}
else
{
var addMessage = new ERC20AddFunctionMessage
{
HashedSecret = swap.SecretHash,
Value = erc20.TokensToTokenDigits(amountInERC20),
FromAddress = walletAddress.Address,
GasPrice = Atomex.Ethereum.GweiToWei(erc20.GasPriceInGwei),
Nonce = nonce
};
addMessage.Gas = await EstimateGasAsync(addMessage, new BigInteger(erc20.AddGasLimit))
.ConfigureAwait(false);
txInput = addMessage.CreateTransactionInput(erc20.SwapContractAddress);
}
transactions.Add(new EthereumTransaction(erc20, txInput)
{
Type = BlockchainTransactionType.Output | BlockchainTransactionType.SwapPayment
});
if (isInitTx)
{
isInitTx = false;
}
if (requiredAmountInERC20 <= 0)
{
break;
}
}
if (requiredAmountInERC20 > 0)
{
Log.Warning("Insufficient ERC20 or Eth funds (left {@requiredAmount}).", requiredAmountInERC20);
return(Enumerable.Empty <EthereumTransaction>());
}
return(transactions);
}
private async Task <IList <EthereumTransaction> > CreateApproveTxsAsync(
Swap swap,
EthereumTransaction paymentTx,
CancellationToken cancellationToken = default)
{
var erc20 = Erc20Config;
Log.Debug("Create approve transactions for swap {@swapId}", swap.Id);
var transactions = new List <EthereumTransaction>();
var walletAddress = await Erc20Account
.GetAddressAsync(paymentTx.From, cancellationToken)
.ConfigureAwait(false);
var gasPrice = await EthConfig
.GetGasPriceAsync(cancellationToken)
.ConfigureAwait(false);
var allowanceMessage = new ERC20AllowanceFunctionMessage
{
Owner = walletAddress.Address,
Spender = erc20.SwapContractAddress,
FromAddress = walletAddress.Address
};
var allowance = await((IEthereumBlockchainApi)erc20.BlockchainApi)
.GetERC20AllowanceAsync(
erc20: erc20,
tokenAddress: erc20.ERC20ContractAddress,
allowanceMessage: allowanceMessage,
cancellationToken: cancellationToken)
.ConfigureAwait(false);
var nonceResult = await((IEthereumBlockchainApi)erc20.BlockchainApi)
.GetTransactionCountAsync(walletAddress.Address, pending: false, cancellationToken)
.ConfigureAwait(false);
if (nonceResult.HasError)
{
Log.Error($"Getting nonce error: {nonceResult.Error.Description}");
return(new List <EthereumTransaction>());
}
if (allowance.Value > 0)
{
var tx = await CreateApproveTx(
walletAddress : walletAddress.Address,
nonce : nonceResult.Value,
value : 0,
gasPrice : gasPrice)
.ConfigureAwait(false);
transactions.Add(tx);
}
var requiredAmountInErc20 = RequiredAmountInTokens(swap, erc20);
var amountInErc20 = AmountHelper.DustProofMin(
walletAddress.Balance,
requiredAmountInErc20,
erc20.DigitsMultiplier,
erc20.DustDigitsMultiplier);
var approveTx = await CreateApproveTx(
walletAddress : walletAddress.Address,
nonce : nonceResult.Value,
value : erc20.TokensToTokenDigits(amountInErc20),
gasPrice : gasPrice)
.ConfigureAwait(false);
transactions.Add(approveTx);
return(transactions);
}
