public async Task <string> BuildTransactionAsync(Guid operationId, AddressBalance from, string toAddress, string memoText, long amount)
{
var fromKeyPair = KeyPair.FromAccountId(from.Address);
var fromAccount = new Account(fromKeyPair, from.Sequence);
var toKeyPair = KeyPair.FromAccountId(toAddress);
var transferableBalance = from.Balance - from.MinBalance;
Operation operation;
if (await _horizonService.AccountExists(toAddress))
{
if (amount <= transferableBalance)
{
var asset = new AssetTypeNative();
operation = new PaymentOperation.Builder(toKeyPair, asset, Operation.FromXdrAmount(amount))
.SetSourceAccount(fromKeyPair)
.Build();
}
else if (!_balanceService.IsDepositBaseAddress(from.Address))
{
operation = new AccountMergeOperation.Builder(toKeyPair)
.SetSourceAccount(fromKeyPair)
.Build();
}
else
{
throw new BusinessException($"It isn't allowed to merge the entire balance from the deposit base into another account! Transfer less funds. transferable={transferableBalance}");
}
}
else
{
if (amount <= transferableBalance)
{
operation = new CreateAccountOperation.Builder(toKeyPair, Operation.FromXdrAmount(amount))
.SetSourceAccount(fromKeyPair)
.Build();
}
else
{
throw new BusinessException($"It isn't possible to merge the entire balance into an unused account! Use a destination in existance. transferable={transferableBalance}");
}
}
var builder = new TransactionBuilder(fromAccount)
.AddOperation(operation)
.SetFee(_appSettings.StellarApiService.OperationFee);
if (!string.IsNullOrWhiteSpace(memoText))
{
var memo = new MemoText(memoText);
builder = builder.AddMemo(memo);
}
var tx = builder.Build();
var xdr = tx.ToUnsignedEnvelopeXdr(TransactionBase.TransactionXdrVersion.V1);
var expirationDate = (DateTime.UtcNow + _transactionExpirationTime);
var maxUnixTimeDouble = expirationDate.ToUnixTime() / 1000;//ms to seconds
var maxTimeUnix = (ulong)maxUnixTimeDouble;
xdr.V1.Tx.TimeBounds = new TimeBounds()
{
MaxTime = new TimePoint(new Uint64(maxTimeUnix)),
MinTime = new TimePoint(new Uint64(0)),
};
var writer = new XdrDataOutputStream();
stellar_dotnet_sdk.xdr.TransactionEnvelope.Encode(writer, xdr);
var xdrBase64 = Convert.ToBase64String(writer.ToArray());
_log.Info("Transaction has been built", new
{
OperationId = operationId,
From = from,
To = toAddress,
Memo = memoText,
Amount = amount,
Fee = tx.Fee,
Sequence = tx.SequenceNumber,
MaxTimeUnix = maxTimeUnix
});
var build = new TxBuild
{
OperationId = operationId,
XdrBase64 = xdrBase64
};
await _buildRepository.AddAsync(build);
return(xdrBase64);
}
public async Task <string> BuildTransactionAsync(Guid operationId, AddressBalance from, string toAddress, long amount)
{
var fromKeyPair = KeyPair.FromAddress(from.Address);
var fromAccount = new Account(fromKeyPair, from.Sequence);
var toKeyPair = KeyPair.FromAddress(toAddress);
var transferableBalance = from.Balance - from.MinBalance;
StellarBase.Operation operation;
if (await _horizonService.AccountExists(toAddress))
{
if (amount <= transferableBalance)
{
var asset = new StellarBase.Asset();
operation = new PaymentOperation.Builder(toKeyPair, asset, amount)
.SetSourceAccount(fromKeyPair)
.Build();
}
else
{
operation = new AccountMergeOperation.Builder(toKeyPair)
.SetSourceAccount(fromKeyPair)
.Build();
}
}
else
{
if (amount <= transferableBalance)
{
operation = new CreateAccountOperation.Builder(toKeyPair, amount)
.SetSourceAccount(fromKeyPair)
.Build();
}
else
{
throw new BusinessException($"Currently not possible to transfer entire balance to an unused account! Use a destination in existance. transferable={transferableBalance}");
}
}
fromAccount.IncrementSequenceNumber();
var tx = new StellarBase.Transaction.Builder(fromAccount)
.AddOperation(operation)
.Build();
var xdr = tx.ToXDR();
var writer = new ByteWriter();
StellarBase.Generated.Transaction.Encode(writer, xdr);
var xdrBase64 = Convert.ToBase64String(writer.ToArray());
var build = new TxBuild
{
OperationId = operationId,
XdrBase64 = xdrBase64
};
await _buildRepository.AddAsync(build);
return(xdrBase64);
}