public void Cancel(string email, int buyId)
{
var user = UserBusiness.GetValidUser(email);
var buy = BuyBusiness.Get(buyId);
if (buy == null || buy.UserId != user.Id || buy.ExpirationDate.HasValue)
{
throw new ArgumentException("Invalid purchase.");
}
if (buy.LastTransaction.TransactionStatus == TransactionStatus.Pending.Value)
{
if (string.IsNullOrEmpty(buy.LastTransaction.TransactionHash))
{
TransactionBusiness.Process(buy.LastTransaction, TransactionStatus.Cancel);
}
else
{
try
{
var transaction = Web3.Web3Business.CheckTransaction(buy.LastTransaction.TransactionHash);
throw new ArgumentException(transaction.BlockNumber.HasValue ? "The transaction is already minted." : "Pending transaction cannot be canceled.");
}
catch (DomainObjects.Web3.Web3Exception ex)
{
if (ex.Code == 404)
{
TransactionBusiness.Process(buy.LastTransaction, TransactionStatus.Cancel);
}
else
{
throw;
}
}
}
}
else if (buy.LastTransaction.TransactionStatus == TransactionStatus.Error.Value)
{
using (var transaction = new TransactionalDapperCommand())
{
var trans = TransactionBusiness.SetCanceled(user.Id);
transaction.Insert(trans);
var buyTrans = BuyTransactionBusiness.SetNew(buyId, trans.Id);
transaction.Insert(buyTrans);
transaction.Commit();
}
}
else
{
throw new ArgumentException("Invalid transaction status.");
}
}
public async Task CheckTransactionsAsync()
{
var pendingTransactions = Data.ListPendingTransactions();
foreach (var pending in pendingTransactions)
{
try
{
var transaction = Web3.Web3Business.CheckTransaction(pending.Transaction.TransactionHash);
if (transaction.BlockNumber.HasValue)
{
if (transaction.Status.Value == 1)
{
TransactionBusiness.Process(pending.Transaction, TransactionStatus.Success);
}
else
{
TransactionBusiness.Process(pending.Transaction, TransactionStatus.Error);
await Email.SendErrorEmailAsync($"Error on escrow result transaction {pending.TransactionId}, with hash {pending.Transaction.TransactionHash}.");
}
}
}
catch (DomainObjects.Web3.Web3Exception ex)
{
if (ex.Code == 404 && TransactionBusiness.TransactionCanBeConsideredLost(pending.Transaction))
{
HandleLostTransaction(pending.Transaction, pending.Transaction.UserId, pending.EscrowResultId);
}
else
{
throw;
}
}
catch (Exception ex)
{
Logger.LogCritical(ex, $"Exception on check escrow result transaction {pending.TransactionId}");
}
}
}
private TransactionStatus CheckAndProcessTransaction(Transaction buyTransaction, int buyId)
{
TransactionStatus status = TransactionStatus.Pending;
try
{
var transaction = Web3.Web3Business.CheckTransaction(buyTransaction.TransactionHash, "Escrow(address,uint256)");
if (transaction.Status.HasValue)
{
if (transaction.Status.Value == 1)
{
if (transaction.EventData != null && transaction.EventData.Length == 2 &&
!string.IsNullOrEmpty(transaction.EventData[0]) && !string.IsNullOrEmpty(transaction.EventData[1]))
{
var wallet = WalletBusiness.GetByUser(buyTransaction.UserId);
if (transaction.EventData[0].ToLower().Trim() != wallet.Address)
{
status = TransactionStatus.Fraud;
}
else
{
var purchase = BuyBusiness.GetSimple(buyId);
var escrowedValue = Util.Util.ConvertBigNumber(transaction.EventData[1], 18);
if (purchase.Price > escrowedValue)
{
status = TransactionStatus.Fraud;
}
else
{
var transactions = ListByUserAndHash(buyTransaction.UserId, buyTransaction.TransactionHash);
if (transactions.Count > 1 && (transactions.Any(c => c.BuyId != buyId) ||
transactions.Any(c => c.Transaction.TransactionStatus != TransactionStatus.Pending.Value)))
{
status = TransactionStatus.Fraud;
}
else
{
status = TransactionStatus.Success;
using (var trans = new TransactionalDapperCommand())
{
purchase.ExpirationDate = DateTime.UtcNow.Date.AddDays(purchase.Days);
trans.Update(purchase);
buyTransaction.TransactionStatus = status.Value;
buyTransaction.ProcessedDate = DateTime.UtcNow;
trans.Update(buyTransaction);
trans.Commit();
}
}
}
}
}
else
{
status = TransactionStatus.Fraud;
}
}
else
{
status = TransactionStatus.Error;
}
if (status != TransactionStatus.Success)
{
TransactionBusiness.Process(buyTransaction, status);
}
}
}
catch (DomainObjects.Web3.Web3Exception ex)
{
if (ex.Code == 404 && TransactionBusiness.TransactionCanBeConsideredLost(buyTransaction))
{
HandleLostTransaction(buyTransaction, buyTransaction.UserId, buyId, null);
}
else
{
throw;
}
}
return(status);
}
