private async Task <EthereumTransaction> CreateApproveTx(
string walletAddress,
BigInteger nonce,
BigInteger value,
decimal gasPrice)
{
var erc20Config = Erc20Config;
var message = new ERC20ApproveFunctionMessage
{
Spender = erc20Config.SwapContractAddress,
Value = value,
FromAddress = walletAddress,
GasPrice = EthereumConfig.GweiToWei(gasPrice),
Nonce = nonce,
};
message.Gas = await EstimateGasAsync(message, new BigInteger(erc20Config.ApproveGasLimit))
.ConfigureAwait(false);
var txInput = message.CreateTransactionInput(erc20Config.ERC20ContractAddress);
return(new EthereumTransaction(erc20Config.Name, txInput)
{
Type = BlockchainTransactionType.Output | BlockchainTransactionType.TokenApprove
});
}
public async Task <Error> SendAsync(
string from,
string to,
decimal amount,
decimal gasLimit,
decimal gasPrice,
bool useDefaultFee = false,
CancellationToken cancellationToken = default)
{
//if (from == to)
// return new Error(
// code: Errors.SendingAndReceivingAddressesAreSame,
// description: "Sending and receiving addresses are the same.");
var ethConfig = EthConfig;
if (useDefaultFee)
{
gasLimit = GasLimitByType(BlockchainTransactionType.Output);
gasPrice = Math.Floor(await ethConfig
.GetGasPriceAsync(cancellationToken)
.ConfigureAwait(false));
}
var addressFeeUsage = await CalculateFundsUsageAsync(
from : from,
amount : amount,
fee : gasLimit,
feePrice : gasPrice,
cancellationToken : cancellationToken)
.ConfigureAwait(false);
if (addressFeeUsage == null)
{
return(new Error(
code: Errors.InsufficientFunds,
description: "Insufficient funds"));
}
if (gasLimit < ethConfig.GasLimit)
{
return(new Error(
code: Errors.InsufficientGas,
description: "Insufficient gas"));
}
Log.Debug("Try to send {@amount} ETH with fee {@fee} from address {@address} with available balance {@balance}",
addressFeeUsage.UsedAmount,
addressFeeUsage.UsedFee,
addressFeeUsage.WalletAddress.Address,
addressFeeUsage.WalletAddress.AvailableBalance());
// lock address to prevent nonce races
using var addressLock = await AddressLocker
.GetLockAsync(addressFeeUsage.WalletAddress.Address, cancellationToken)
.ConfigureAwait(false);
var nonceAsyncResult = await EthereumNonceManager.Instance
.GetNonceAsync(ethConfig, addressFeeUsage.WalletAddress.Address)
.ConfigureAwait(false);
if (nonceAsyncResult.HasError)
{
return(nonceAsyncResult.Error);
}
var tx = new EthereumTransaction
{
Currency = ethConfig.Name,
Type = BlockchainTransactionType.Output,
CreationTime = DateTime.UtcNow,
To = to.ToLowerInvariant(),
Amount = EthereumConfig.EthToWei(addressFeeUsage.UsedAmount),
Nonce = nonceAsyncResult.Value,
GasPrice = new BigInteger(EthereumConfig.GweiToWei(gasPrice)),
GasLimit = new BigInteger(gasLimit),
};
var signResult = await Wallet
.SignAsync(tx, addressFeeUsage.WalletAddress, ethConfig, cancellationToken)
.ConfigureAwait(false);
if (!signResult)
{
return(new Error(
code: Errors.TransactionSigningError,
description: "Transaction signing error"));
}
if (!tx.Verify(ethConfig))
{
return(new Error(
code: Errors.TransactionVerificationError,
description: "Transaction verification error"));
}
var broadcastResult = await ethConfig.BlockchainApi
.TryBroadcastAsync(tx, cancellationToken : cancellationToken)
.ConfigureAwait(false);
if (broadcastResult.HasError)
{
return(broadcastResult.Error);
}
var txId = broadcastResult.Value;
if (txId == null)
{
return(new Error(
code: Errors.TransactionBroadcastError,
description: "Transaction Id is null"));
}
Log.Debug("Transaction successfully sent with txId: {@id}", txId);
await UpsertTransactionAsync(
tx : tx,
updateBalance : false,
notifyIfUnconfirmed : true,
notifyIfBalanceUpdated : false,
cancellationToken : cancellationToken)
.ConfigureAwait(false);
_ = UpdateBalanceAsync(cancellationToken);
return(null);
}
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 override async Task RefundAsync(
Swap swap,
CancellationToken cancellationToken = default)
{
var ethConfig = EthConfig;
if (swap.StateFlags.HasFlag(SwapStateFlags.IsRefundBroadcast) &&
swap.RefundTx != null &&
swap.RefundTx.CreationTime != null &&
swap.RefundTx.CreationTime.Value.ToUniversalTime() + TimeSpan.FromMinutes(20) > DateTime.UtcNow)
{
_ = TrackTransactionConfirmationAsync(
swap: swap,
currency: ethConfig,
dataRepository: _account.DataRepository,
txId: swap.RefundTx.Id,
confirmationHandler: RefundConfirmedEventHandler,
cancellationToken: cancellationToken);
return;
}
var lockTimeInSeconds = swap.IsInitiator
? DefaultInitiatorLockTimeInSeconds
: DefaultAcceptorLockTimeInSeconds;
var lockTime = swap.TimeStamp.ToUniversalTime() + TimeSpan.FromSeconds(lockTimeInSeconds);
await RefundTimeDelayAsync(lockTime, cancellationToken)
.ConfigureAwait(false);
// check swap initiation
try
{
var txResult = await EthereumSwapInitiatedHelper
.TryToFindPaymentAsync(swap, ethConfig, cancellationToken)
.ConfigureAwait(false);
if (!txResult.HasError && txResult.Value == null)
{
// swap not initiated and must be canceled
swap.StateFlags |= SwapStateFlags.IsCanceled;
await UpdateSwapAsync(swap, SwapStateFlags.IsCanceled, cancellationToken)
.ConfigureAwait(false);
return;
}
}
catch (Exception e)
{
Log.Error(e, $"Can't check {swap.Id} swap initiation for ETH");
}
Log.Debug("Create refund for swap {@swap}", swap.Id);
var gasPrice = await ethConfig
.GetGasPriceAsync(cancellationToken)
.ConfigureAwait(false);
var walletAddress = await _account
.GetAddressAsync(swap.FromAddress, cancellationToken)
.ConfigureAwait(false);
if (walletAddress == null)
{
Log.Error("Can't get address {@address} for refund from local db", swap.FromAddress);
return;
}
var feeInEth = ethConfig.GetFeeAmount(ethConfig.RefundGasLimit, gasPrice);
if (walletAddress.Balance < feeInEth)
{
Log.Error("Insufficient funds for refund");
return;
}
EthereumTransaction refundTx;
try
{
await EthereumAccount.AddressLocker
.LockAsync(walletAddress.Address, cancellationToken)
.ConfigureAwait(false);
var nonceResult = await EthereumNonceManager.Instance
.GetNonceAsync(ethConfig, walletAddress.Address, pending : true, cancellationToken)
.ConfigureAwait(false);
if (nonceResult.HasError)
{
Log.Error("Nonce getting error with code {@code} and description {@description}",
nonceResult.Error.Code,
nonceResult.Error.Description);
return;
}
var message = new RefundFunctionMessage
{
FromAddress = walletAddress.Address,
HashedSecret = swap.SecretHash,
GasPrice = EthereumConfig.GweiToWei(gasPrice),
Nonce = nonceResult.Value,
};
message.Gas = await EstimateGasAsync(message, new BigInteger(ethConfig.RefundGasLimit))
.ConfigureAwait(false);
var txInput = message.CreateTransactionInput(ethConfig.SwapContractAddress);
refundTx = new EthereumTransaction(ethConfig.Name, txInput)
{
Type = BlockchainTransactionType.Output | BlockchainTransactionType.SwapRefund
};
var signResult = await SignTransactionAsync(refundTx, cancellationToken)
.ConfigureAwait(false);
if (!signResult)
{
Log.Error("Transaction signing error");
return;
}
swap.RefundTx = refundTx;
swap.StateFlags |= SwapStateFlags.IsRefundSigned;
await UpdateSwapAsync(swap, SwapStateFlags.IsRefundSigned, cancellationToken)
.ConfigureAwait(false);
await BroadcastTxAsync(swap, refundTx, cancellationToken)
.ConfigureAwait(false);
}
catch
{
throw;
}
finally
{
EthereumAccount.AddressLocker.Unlock(walletAddress.Address);
}
swap.RefundTx = refundTx;
swap.StateFlags |= SwapStateFlags.IsRefundBroadcast;
await UpdateSwapAsync(swap, SwapStateFlags.IsRefundBroadcast, cancellationToken)
.ConfigureAwait(false);
_ = TrackTransactionConfirmationAsync(
swap: swap,
currency: ethConfig,
dataRepository: _account.DataRepository,
txId: refundTx.Id,
confirmationHandler: RefundConfirmedEventHandler,
cancellationToken: cancellationToken);
}
public override async Task RedeemForPartyAsync(
Swap swap,
CancellationToken cancellationToken = default)
{
if (swap.IsInitiator)
{
var partyRedeemDeadline = swap.TimeStamp.ToUniversalTime().AddSeconds(DefaultAcceptorLockTimeInSeconds) - PartyRedeemTimeReserve;
if (DateTime.UtcNow > partyRedeemDeadline)
{
Log.Error("Party redeem deadline reached for swap {@swap}", swap.Id);
return;
}
}
Log.Debug("Create redeem for counterParty for swap {@swapId}", swap.Id);
var ethConfig = EthConfig;
var gasPrice = await ethConfig
.GetGasPriceAsync(cancellationToken)
.ConfigureAwait(false);
var walletAddress = await _account
.GetAddressAsync(swap.FromAddress, cancellationToken)
.ConfigureAwait(false);
if (walletAddress == null)
{
Log.Error("Can't get address {@address} for redeem for party from local db", swap.FromAddress);
return;
}
var feeInEth = ethConfig.GetFeeAmount(ethConfig.RedeemGasLimit, gasPrice);
if (walletAddress.Balance < feeInEth)
{
Log.Error("Insufficient funds for redeem for party");
return;
}
using var addressLock = await EthereumAccount.AddressLocker
.GetLockAsync(walletAddress.Address, cancellationToken)
.ConfigureAwait(false);
var nonceResult = await EthereumNonceManager.Instance
.GetNonceAsync(ethConfig, walletAddress.Address, pending : true, cancellationToken)
.ConfigureAwait(false);
if (nonceResult.HasError)
{
Log.Error("Nonce getting error with code {@code} and description {@description}",
nonceResult.Error.Code,
nonceResult.Error.Description);
return;
}
var message = new RedeemFunctionMessage
{
FromAddress = walletAddress.Address,
HashedSecret = swap.SecretHash,
Secret = swap.Secret,
Nonce = nonceResult.Value,
GasPrice = EthereumConfig.GweiToWei(gasPrice),
};
message.Gas = await EstimateGasAsync(message, new BigInteger(ethConfig.RedeemGasLimit))
.ConfigureAwait(false);
var txInput = message.CreateTransactionInput(ethConfig.SwapContractAddress);
var redeemTx = new EthereumTransaction(ethConfig.Name, txInput)
{
Type = BlockchainTransactionType.Output | BlockchainTransactionType.SwapRedeem
};
var signResult = await SignTransactionAsync(redeemTx, cancellationToken)
.ConfigureAwait(false);
if (!signResult)
{
Log.Error("Transaction signing error");
return;
}
await BroadcastTxAsync(swap, redeemTx, cancellationToken)
.ConfigureAwait(false);
}
public override async Task RedeemAsync(
Swap swap,
CancellationToken cancellationToken = default)
{
var ethConfig = EthConfig;
var secretResult = await EthereumSwapRedeemedHelper
.IsRedeemedAsync(
swap : swap,
currency : ethConfig,
attempts : MaxRedeemCheckAttempts,
attemptIntervalInSec : RedeemCheckAttemptIntervalInSec,
cancellationToken : cancellationToken)
.ConfigureAwait(false);
if (!secretResult.HasError && secretResult.Value != null)
{
await RedeemConfirmedEventHandler(swap, null, cancellationToken)
.ConfigureAwait(false);
return;
}
if (swap.StateFlags.HasFlag(SwapStateFlags.IsRedeemBroadcast) &&
swap.RedeemTx != null &&
swap.RedeemTx.CreationTime != null &&
swap.RedeemTx.CreationTime.Value.ToUniversalTime() + TimeSpan.FromMinutes(30) > DateTime.UtcNow)
{
// redeem already broadcast
_ = TrackTransactionConfirmationAsync(
swap: swap,
currency: ethConfig,
dataRepository: _account.DataRepository,
txId: swap.RedeemTx.Id,
confirmationHandler: RedeemConfirmedEventHandler,
cancellationToken: cancellationToken);
return;
}
if (swap.IsInitiator)
{
var redeemDeadline = swap.TimeStamp.ToUniversalTime().AddSeconds(DefaultAcceptorLockTimeInSeconds) - RedeemTimeReserve;
if (DateTime.UtcNow > redeemDeadline)
{
Log.Error("Redeem dedline reached for swap {@swap}", swap.Id);
return;
}
}
Log.Debug("Create redeem for swap {@swapId}", swap.Id);
var gasPrice = await ethConfig
.GetGasPriceAsync(cancellationToken)
.ConfigureAwait(false);
var walletAddress = await _account
.GetAddressAsync(swap.RedeemFromAddress, cancellationToken)
.ConfigureAwait(false);
if (walletAddress == null)
{
Log.Error("Can't get address {@address} for redeem from local db", swap.RedeemFromAddress);
return;
}
var feeInEth = ethConfig.GetFeeAmount(ethConfig.RedeemGasLimit, gasPrice);
if (walletAddress.Balance < feeInEth)
{
Log.Error("Insufficient funds for redeem");
return;
}
EthereumTransaction redeemTx;
try
{
await EthereumAccount.AddressLocker
.LockAsync(walletAddress.Address, cancellationToken)
.ConfigureAwait(false);
var nonceResult = await EthereumNonceManager.Instance
.GetNonceAsync(ethConfig, walletAddress.Address, pending : true, cancellationToken : cancellationToken)
.ConfigureAwait(false);
if (nonceResult.HasError)
{
Log.Error("Nonce getting error with code {@code} and description {@description}",
nonceResult.Error.Code,
nonceResult.Error.Description);
return;
}
var message = new RedeemFunctionMessage
{
FromAddress = walletAddress.Address,
HashedSecret = swap.SecretHash,
Secret = swap.Secret,
Nonce = nonceResult.Value,
GasPrice = EthereumConfig.GweiToWei(gasPrice),
};
message.Gas = await EstimateGasAsync(message, new BigInteger(ethConfig.RedeemGasLimit))
.ConfigureAwait(false);
var txInput = message.CreateTransactionInput(ethConfig.SwapContractAddress);
redeemTx = new EthereumTransaction(ethConfig.Name, txInput)
{
Type = BlockchainTransactionType.Output | BlockchainTransactionType.SwapRedeem
};
var signResult = await SignTransactionAsync(redeemTx, cancellationToken)
.ConfigureAwait(false);
if (!signResult)
{
Log.Error("Transaction signing error");
return;
}
swap.RedeemTx = redeemTx;
swap.StateFlags |= SwapStateFlags.IsRedeemSigned;
await UpdateSwapAsync(swap, SwapStateFlags.IsRedeemSigned, cancellationToken)
.ConfigureAwait(false);
await BroadcastTxAsync(swap, redeemTx, cancellationToken)
.ConfigureAwait(false);
}
catch
{
throw;
}
finally
{
EthereumAccount.AddressLocker.Unlock(walletAddress.Address);
}
swap.RedeemTx = redeemTx;
swap.StateFlags |= SwapStateFlags.IsRedeemBroadcast;
await UpdateSwapAsync(swap, SwapStateFlags.IsRedeemBroadcast, cancellationToken)
.ConfigureAwait(false);
_ = TrackTransactionConfirmationAsync(
swap: swap,
currency: ethConfig,
dataRepository: _account.DataRepository,
txId: redeemTx.Id,
confirmationHandler: RedeemConfirmedEventHandler,
cancellationToken: cancellationToken);
}
public async Task <Error> SendAsync(
string from,
string to,
decimal amount,
decimal gasLimit = 0,
decimal gasPrice = 0,
bool useDefaultFee = false,
CancellationToken cancellationToken = default)
{
//if (from == to)
// return new Error(
// code: Errors.SendingAndReceivingAddressesAreSame,
// description: "Sending and receiving addresses are the same.");
var erc20Config = Erc20Config;
if (useDefaultFee)
{
gasLimit = GasLimitByType(BlockchainTransactionType.Output);
gasPrice = await erc20Config
.GetGasPriceAsync()
.ConfigureAwait(false);
}
var addressFeeUsage = await SelectUnspentAddressesAsync(
from : from,
amount : amount,
fee : gasLimit,
feePrice : gasPrice,
cancellationToken : cancellationToken)
.ConfigureAwait(false);
if (addressFeeUsage == null)
{
return(new Error(
code: Errors.InsufficientFunds,
description: "Insufficient funds"));
}
if (gasLimit < erc20Config.TransferGasLimit)
{
return(new Error(
code: Errors.InsufficientGas,
description: "Insufficient gas"));
}
var feeAmount = erc20Config.GetFeeAmount(gasLimit, gasPrice);
Log.Debug("Fee per transaction {@feePerTransaction}. Fee Amount {@feeAmount}",
gasLimit,
feeAmount);
Log.Debug("Send {@amount} of {@currency} from address {@address} with available balance {@balance}",
addressFeeUsage.UsedAmount,
erc20Config.Name,
addressFeeUsage.WalletAddress.Address,
addressFeeUsage.WalletAddress.AvailableBalance());
using var addressLock = await EthereumAccount.AddressLocker
.GetLockAsync(addressFeeUsage.WalletAddress.Address, cancellationToken)
.ConfigureAwait(false);
var nonceResult = await EthereumNonceManager.Instance
.GetNonceAsync(EthConfig, addressFeeUsage.WalletAddress.Address)
.ConfigureAwait(false);
if (nonceResult.HasError)
{
return(nonceResult.Error);
}
TransactionInput txInput;
var message = new ERC20TransferFunctionMessage
{
To = to.ToLowerInvariant(),
Value = erc20Config.TokensToTokenDigits(addressFeeUsage.UsedAmount),
FromAddress = addressFeeUsage.WalletAddress.Address,
Gas = new BigInteger(gasLimit),
GasPrice = new BigInteger(EthereumConfig.GweiToWei(gasPrice)),
Nonce = nonceResult.Value
};
txInput = message.CreateTransactionInput(erc20Config.ERC20ContractAddress);
var tx = new EthereumTransaction(erc20Config.Name, txInput)
{
Type = BlockchainTransactionType.Output
};
var signResult = await Wallet
.SignAsync(tx, addressFeeUsage.WalletAddress, erc20Config, cancellationToken)
.ConfigureAwait(false);
if (!signResult)
{
return(new Error(
code: Errors.TransactionSigningError,
description: "Transaction signing error"));
}
if (!tx.Verify(erc20Config))
{
return(new Error(
code: Errors.TransactionVerificationError,
description: "Transaction verification error"));
}
var broadcastResult = await erc20Config.BlockchainApi
.BroadcastAsync(tx, cancellationToken)
.ConfigureAwait(false);
if (broadcastResult.HasError)
{
return(broadcastResult.Error);
}
var txId = broadcastResult.Value;
if (txId == null)
{
return(new Error(
code: Errors.TransactionBroadcastError,
description: "Transaction Id is null"));
}
Log.Debug("Transaction successfully sent with txId: {@id}", txId);
tx.Amount = erc20Config.TokensToTokenDigits(addressFeeUsage.UsedAmount);
tx.To = to.ToLowerInvariant();
await UpsertTransactionAsync(
tx : tx,
updateBalance : false,
notifyIfUnconfirmed : true,
notifyIfBalanceUpdated : false,
cancellationToken : cancellationToken)
.ConfigureAwait(false);
var ethTx = tx.Clone();
ethTx.Currency = EthConfig.Name;
ethTx.Amount = 0;
ethTx.Type = BlockchainTransactionType.TokenCall;
await UpsertTransactionAsync(
tx : ethTx,
updateBalance : false,
notifyIfUnconfirmed : true,
notifyIfBalanceUpdated : false,
cancellationToken : cancellationToken)
.ConfigureAwait(false);
_ = UpdateBalanceAsync(cancellationToken);
return(null);
}
protected async Task <EthereumTransaction> CreatePaymentTxAsync(
Swap swap,
int lockTimeInSeconds,
CancellationToken cancellationToken = default)
{
var erc20Config = Erc20Config;
Log.Debug("Create payment transaction from address {@adderss} for swap {@swapId}", swap.FromAddress, swap.Id);
var requiredAmountInERC20 = RequiredAmountInTokens(swap, erc20Config);
var refundTimeStampUtcInSec = new DateTimeOffset(swap.TimeStamp.ToUniversalTime().AddSeconds(lockTimeInSeconds)).ToUnixTimeSeconds();
var rewardForRedeemInERC20 = swap.PartyRewardForRedeem;
var walletAddress = await Erc20Account
.GetAddressAsync(swap.FromAddress, cancellationToken)
.ConfigureAwait(false);
var gasPrice = await EthConfig
.GetGasPriceAsync(cancellationToken)
.ConfigureAwait(false);
var balanceInEth = (await EthereumAccount
.GetAddressBalanceAsync(
address: walletAddress.Address,
cancellationToken: cancellationToken)
.ConfigureAwait(false))
.Available;
var feeAmountInEth = rewardForRedeemInERC20 == 0
? erc20Config.InitiateFeeAmount(gasPrice)
: erc20Config.InitiateWithRewardFeeAmount(gasPrice);
if (balanceInEth < feeAmountInEth)
{
Log.Error(
"Insufficient funds at {@address} for fee. Balance: {@balance}, feeAmount: {@feeAmount}, result: {@result}.",
walletAddress.Address,
balanceInEth,
feeAmountInEth,
balanceInEth - feeAmountInEth);
return(null);
}
var balanceInErc20 = walletAddress.Balance;
Log.Debug("Available balance: {@balance}", balanceInErc20);
if (balanceInErc20 < requiredAmountInERC20)
{
Log.Error(
"Insufficient funds at {@address}. Balance: {@balance}, required: {@result}, missing: {@missing}.",
walletAddress.Address,
balanceInErc20,
requiredAmountInERC20,
balanceInErc20 - requiredAmountInERC20);
return(null);
}
var amountInErc20 = AmountHelper.DustProofMin(
balanceInErc20,
requiredAmountInERC20,
erc20Config.DigitsMultiplier,
erc20Config.DustDigitsMultiplier);
var nonceResult = await((IEthereumBlockchainApi)erc20Config.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 initMessage = new ERC20InitiateFunctionMessage
{
HashedSecret = swap.SecretHash,
ERC20Contract = erc20Config.ERC20ContractAddress,
Participant = swap.PartyAddress,
RefundTimestamp = refundTimeStampUtcInSec,
Countdown = lockTimeInSeconds,
Value = erc20Config.TokensToTokenDigits(amountInErc20),
RedeemFee = erc20Config.TokensToTokenDigits(rewardForRedeemInERC20),
Active = true,
FromAddress = walletAddress.Address,
GasPrice = EthereumConfig.GweiToWei(gasPrice),
Nonce = nonceResult.Value
};
var initiateGasLimit = rewardForRedeemInERC20 == 0
? erc20Config.InitiateGasLimit
: erc20Config.InitiateWithRewardGasLimit;
initMessage.Gas = await EstimateGasAsync(initMessage, new BigInteger(initiateGasLimit))
.ConfigureAwait(false);
txInput = initMessage.CreateTransactionInput(erc20Config.SwapContractAddress);
return(new EthereumTransaction(erc20Config.Name, txInput)
{
Type = BlockchainTransactionType.Output | BlockchainTransactionType.SwapPayment
});
}
