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);
}
