private async Task <(BigInteger?gasPrice, BigInteger?gasValue)> GetGasPriceAndValueAsync(BigInteger?gasPrice, BigInteger?gasValue)
{
var gasPriceSetting = await _gasPriceRepository.GetAsync();
var currentGasPrice = (await _web3.Eth.GasPrice.SendRequestAsync()).Value;
var selectedGasPrice = currentGasPrice * _baseSettings.GasPricePercentage / 100;
if (selectedGasPrice > gasPriceSetting.Max)
{
selectedGasPrice = gasPriceSetting.Max;
}
else if (selectedGasPrice < gasPriceSetting.Min)
{
selectedGasPrice = gasPriceSetting.Min;
}
gasPrice = gasPrice == null || gasPrice.Value == 0 ? selectedGasPrice : gasPrice;
gasValue = gasValue == null || gasValue.Value == 0 ? Constants.GasForCoinTransaction : gasValue;
return(gasPrice, gasValue);
}
/// <summary>
///
/// </summary>
/// <param name="hotWalletCashout"></param>
/// <returns>transaction hash</returns>
public async Task <string> StartCashoutAsync(string operationId)
{
IHotWalletOperation cashout = await _hotWalletCashoutRepository.GetAsync(operationId);
if (cashout == null || cashout.OperationType != HotWalletOperationType.Cashout)
{
await _log.WriteWarningAsync(nameof(HotWalletService),
nameof(StartCashoutAsync),
$"operationId - {operationId}",
"No cashout info for operation",
DateTime.UtcNow);
return(null);
}
var gasPrice = await _gasPriceRepository.GetAsync();
var currentGasPriceHex = await _web3.Eth.GasPrice.SendRequestAsync();
var currentGasPrice = currentGasPriceHex.Value;
BigInteger selectedGasPrice = currentGasPrice * _baseSettings.GasPricePercentage / 100;
if (selectedGasPrice > gasPrice.Max)
{
selectedGasPrice = gasPrice.Max;
}
else if (selectedGasPrice < gasPrice.Min)
{
selectedGasPrice = gasPrice.Min;
}
string transactionForSigning = null;
string signedTransaction = null;
string transactionHash = null;
bool isErc20Transfer = !string.IsNullOrEmpty(cashout.TokenAddress);
SemaphoreSlim semaphore = _semaphores.GetOrAdd(cashout.FromAddress, f => new SemaphoreSlim(1, 1));
try
{
await semaphore.WaitAsync();
//Erc20 transfer
if (isErc20Transfer)
{
transactionForSigning = await _erc20PrivateWalletService.GetTransferTransactionRaw(new Lykke.Service.EthereumCore.BusinessModels.PrivateWallet.Erc20Transaction()
{
FromAddress = cashout.FromAddress,
GasAmount = Constants.GasForHotWalletTransaction,
GasPrice = selectedGasPrice,
ToAddress = cashout.ToAddress,
TokenAddress = cashout.TokenAddress,
TokenAmount = cashout.Amount,
Value = 0,
}, useTxPool : true);
}
//Eth transfer
else
{
transactionForSigning = await _privateWalletService.GetTransactionForSigning(new Lykke.Service.EthereumCore.BusinessModels.PrivateWallet.EthTransaction()
{
FromAddress = cashout.FromAddress,
GasAmount = Constants.GasForHotWalletTransaction,
GasPrice = selectedGasPrice,
ToAddress = cashout.ToAddress,
Value = cashout.Amount
}, useTxPool : true);
}
signedTransaction = await _signatureService.SignRawTransactionAsync(cashout.FromAddress, transactionForSigning);
if (string.IsNullOrEmpty(signedTransaction))
{
throw new ClientSideException(ExceptionType.WrongSign, "Wrong signature");
}
var transactionExecutionCosts =
await _privateWalletService.EstimateTransactionExecutionCost(cashout.FromAddress, signedTransaction);
if (!transactionExecutionCosts.IsAllowed)
{
throw new Exception($"Transaction will not be successfull {JsonSerialisersExt.ToJson(cashout)}");
}
transactionHash = isErc20Transfer ? await _erc20PrivateWalletService.SubmitSignedTransaction(cashout.FromAddress, signedTransaction) :
await _privateWalletService.SubmitSignedTransaction(cashout.FromAddress, signedTransaction);
}
finally
{
semaphore.Release();
}
if (string.IsNullOrEmpty(transactionHash))
{
throw new Exception("Transaction was not sent");
}
CoinTransactionMessage message = new CoinTransactionMessage()
{
OperationId = operationId,
TransactionHash = transactionHash
};
await _hotWalletCashoutTransactionRepository.SaveAsync(new HotWalletCashoutTransaction()
{
OperationId = operationId,
TransactionHash = transactionHash
});
await _hotWalletTransactionMonitoringQueue.PutRawMessageAsync(Newtonsoft.Json.JsonConvert.SerializeObject(message));
return(transactionHash);
}