public void Run(Transaction tx,
DateTime blockTime, ulong coinbase = 0,
List <TransactionOutput> spentTxo = null)
{
logger.LogDebug($@"Attempt to run TX:{
tx.Id.ToString().Substring(0, 7)}");
// Transaction header validity check.
if (tx.Timestamp > blockTime ||
!(coinbase == 0 ^ tx.InEntries.Count == 0))
{
throw new ArgumentException();
}
// In-Entry validity check.
ulong inSum = coinbase;
var redeemed = new List <TransactionOutput>();
var signHash = BlockchainUtil.GetTransactionSignHash(tx.Original);
foreach (var inEntry in tx.InEntries)
{
// Signature check.
var verified = EccService.Verify(
signHash, inEntry.Signature, inEntry.PublicKey);
// UTXO check. The transaction output must not be spent by
// previous transactions.
var txo = new TransactionOutput
{
TransactionId = inEntry.TransactionId,
OutIndex = inEntry.OutEntryIndex,
};
var unspent =
!(spentTxo?.Contains(txo) ?? false) &&
Utxos.TryGetValue(txo, out txo);
// Recipient address check.
var addr = BlockchainUtil.ToAddress(inEntry.PublicKey);
var redeemable = txo.Recipient.Equals(
ByteString.CopyFrom(addr));
// Sum all the reedemable.
inSum = checked (inSum + txo.Amount);
if (!verified || !unspent || !redeemable)
{
throw new ArgumentException();
}
redeemed.Add(txo);
}
// Out-entry validity check.
ulong outSum = 0;
ushort outIndex = 0;
var generated = new List <TransactionOutput>();
foreach (var outEntry in tx.OutEntries)
{
if (outEntry.RecipientHash.IsNull() || outEntry.Amount <= 0)
{
throw new ArgumentException();
}
// Sum all the transferred.
outSum = checked (outSum + outEntry.Amount);
// Create new UTXO entry.
generated.Add(new TransactionOutput
{
TransactionId = tx.Id,
OutIndex = outIndex++,
Recipient = outEntry.RecipientHash,
Amount = outEntry.Amount,
});
}
// Output exceeds input or coinbase.
if (outSum > inSum)
{
throw new ArgumentException();
}
tx.ExecInfo = new TransactionExecInformation
{
Coinbase = coinbase != 0,
RedeemedOutputs = redeemed,
GeneratedOutputs = generated,
TransactionFee = inSum - outSum,
};
}
