/// <summary>
/// Checks if a transaction has valid UTXOs that are spent by it.
/// </summary>
/// <param name="transaction">The transaction to check.</param>
/// <param name="coins">Returns the coins found if this parameter supplies an empty coin list.</param>
/// <returns><c>True</c> if UTXO's are valid and <c>false</c> otherwise.</returns>
private bool TransactionHasValidUTXOs(Transaction transaction, List <Coin> coins = null)
{
lock (this.lockObject)
{
// All the input UTXO's should be present in spending details of the multi-sig address.
foreach (TxIn input in transaction.Inputs)
{
TransactionData transactionData = this.Wallet.MultiSigAddress.Transactions
.Where(t => t.Id == input.PrevOut.Hash && t.Index == input.PrevOut.N && t.SpendingDetails?.TransactionId == transaction.GetHash())
.SingleOrDefault();
if (transactionData == null)
{
return(false);
}
coins?.Add(new Coin(transactionData.Id, (uint)transactionData.Index, transactionData.Amount, transactionData.ScriptPubKey));
}
return(true);
}
}
/// <summary>
/// Compares transaction data to determine the order of inclusion in the transaction.
/// </summary>
/// <param name="x">First transaction data.</param>
/// <param name="y">Second transaction data.</param>
/// <returns>Returns <c>0</c> if the outputs are the same and <c>-1<c> or <c>1</c> depending on whether the first or second output takes precedence.</returns>
public static int CompareTransactionData(TransactionData x, TransactionData y)
{
// The oldest UTXO (determined by block height) is selected first.
if ((x.BlockHeight ?? int.MaxValue) != (y.BlockHeight ?? int.MaxValue))
{
return(((x.BlockHeight ?? int.MaxValue) < (y.BlockHeight ?? int.MaxValue)) ? -1 : 1);
}
// If a block has more than one UTXO, then they are selected in order of transaction id.
if (x.Id != y.Id)
{
return((x.Id < y.Id) ? -1 : 1);
}
// If multiple UTXOs appear within a transaction then they are selected in ascending index order.
if (x.Index != y.Index)
{
return((x.Index < y.Index) ? -1 : 1);
}
return(0);
}
/// <summary>
/// Mark an output as spent, the credit of the output will not be used to calculate the balance.
/// The output will remain in the wallet for history (and reorg).
/// </summary>
/// <param name="transaction">The transaction from which details are added.</param>
/// <param name="paidToOutputs">A list of payments made out</param>
/// <param name="spendingTransactionId">The id of the transaction containing the output being spent, if this is a spending transaction.</param>
/// <param name="spendingTransactionIndex">The index of the output in the transaction being referenced, if this is a spending transaction.</param>
/// <param name="blockHeight">Height of the block.</param>
/// <param name="blockHash">Hash of the block.</param>
/// <param name="block">The block containing the transaction to add.</param>
private void AddSpendingTransactionToWallet(Transaction transaction, IEnumerable <TxOut> paidToOutputs,
uint256 spendingTransactionId, int?spendingTransactionIndex, int?blockHeight = null, uint256 blockHash = null, Block block = null)
{
Guard.NotNull(transaction, nameof(transaction));
Guard.NotNull(paidToOutputs, nameof(paidToOutputs));
Guard.Assert(blockHash == (blockHash ?? block?.GetHash()));
// Get the transaction being spent.
TransactionData spentTransaction = this.Wallet.MultiSigAddress.Transactions.SingleOrDefault(t => (t.Id == spendingTransactionId) && (t.Index == spendingTransactionIndex));
if (spentTransaction == null)
{
// Strange, why would it be null?
this.logger.LogTrace("(-)[TX_NULL]");
return;
}
// If the details of this spending transaction are seen for the first time.
if (spentTransaction.SpendingDetails == null)
{
this.logger.LogTrace("Spending UTXO '{0}-{1}' is new. BlockHeight={2}", spendingTransactionId, spendingTransactionIndex, blockHeight);
List <PaymentDetails> payments = new List <PaymentDetails>();
foreach (TxOut paidToOutput in paidToOutputs)
{
// Figure out how to retrieve the destination address.
string destinationAddress = string.Empty;
ScriptTemplate scriptTemplate = paidToOutput.ScriptPubKey.FindTemplate(this.network);
switch (scriptTemplate.Type)
{
// Pay to PubKey can be found in outputs of staking transactions.
case TxOutType.TX_PUBKEY:
PubKey pubKey = PayToPubkeyTemplate.Instance.ExtractScriptPubKeyParameters(paidToOutput.ScriptPubKey);
destinationAddress = pubKey.GetAddress(this.network).ToString();
break;
// Pay to PubKey hash is the regular, most common type of output.
case TxOutType.TX_PUBKEYHASH:
destinationAddress = paidToOutput.ScriptPubKey.GetDestinationAddress(this.network).ToString();
break;
case TxOutType.TX_NONSTANDARD:
case TxOutType.TX_SCRIPTHASH:
destinationAddress = paidToOutput.ScriptPubKey.GetDestinationAddress(this.network).ToString();
break;
case TxOutType.TX_MULTISIG:
case TxOutType.TX_NULL_DATA:
case TxOutType.TX_SEGWIT:
break;
}
payments.Add(new PaymentDetails
{
DestinationScriptPubKey = paidToOutput.ScriptPubKey,
DestinationAddress = destinationAddress,
Amount = paidToOutput.Value
});
}
SpendingDetails spendingDetails = new SpendingDetails
{
TransactionId = transaction.GetHash(),
Payments = payments,
CreationTime = DateTimeOffset.FromUnixTimeSeconds(block?.Header.Time ?? transaction.Time),
BlockHeight = blockHeight,
BlockHash = blockHash,
Hex = transaction.ToHex(),
IsCoinStake = transaction.IsCoinStake == false ? (bool?)null : true
};
spentTransaction.SpendingDetails = spendingDetails;
spentTransaction.MerkleProof = null;
}
else // If this spending transaction is being confirmed in a block.
{
this.logger.LogTrace("Spending transaction ID '{0}' is being confirmed, updating. BlockHeight={1}", spendingTransactionId, blockHeight);
// Update the block height.
if (spentTransaction.SpendingDetails.BlockHeight == null && blockHeight != null)
{
spentTransaction.SpendingDetails.BlockHeight = blockHeight;
spentTransaction.SpendingDetails.BlockHash = blockHash;
}
// Update the block time to be that of the block in which the transaction is confirmed.
if (block != null)
{
spentTransaction.SpendingDetails.CreationTime = DateTimeOffset.FromUnixTimeSeconds(block.Header.Time);
}
}
}
/// <summary>
/// Adds a transaction that credits the wallet with new coins.
/// This method is can be called many times for the same transaction (idempotent).
/// </summary>
/// <param name="transaction">The transaction from which details are added.</param>
/// <param name="utxo">The unspent output to add to the wallet.</param>
/// <param name="blockHeight">Height of the block.</param>
/// <param name="blockHash">Hash of the block.</param>
/// <param name="block">The block containing the transaction to add.</param>
private void AddTransactionToWallet(Transaction transaction, TxOut utxo, int?blockHeight = null, uint256 blockHash = null, Block block = null)
{
Guard.NotNull(transaction, nameof(transaction));
Guard.NotNull(utxo, nameof(utxo));
Guard.Assert(blockHash == (blockHash ?? block?.GetHash()));
uint256 transactionHash = transaction.GetHash();
// Get the collection of transactions to add to.
Script script = utxo.ScriptPubKey;
// Check if a similar UTXO exists or not (same transaction ID and same index).
// New UTXOs are added, existing ones are updated.
int index = transaction.Outputs.IndexOf(utxo);
Money amount = utxo.Value;
TransactionData foundTransaction = this.Wallet.MultiSigAddress.Transactions.FirstOrDefault(t => (t.Id == transactionHash) && (t.Index == index));
if (foundTransaction == null)
{
this.logger.LogTrace("UTXO '{0}-{1}' not found, creating. BlockHeight={2}, BlockHash={3}", transactionHash, index, blockHeight, blockHash);
TransactionData newTransaction = new TransactionData
{
Amount = amount,
BlockHeight = blockHeight,
BlockHash = blockHash,
Id = transactionHash,
CreationTime = DateTimeOffset.FromUnixTimeSeconds(block?.Header.Time ?? transaction.Time),
Index = index,
ScriptPubKey = script,
Hex = transaction.ToHex()
};
// Add the Merkle proof to the (non-spending) transaction.
if (block != null)
{
newTransaction.MerkleProof = new MerkleBlock(block, new[] { transactionHash }).PartialMerkleTree;
}
this.Wallet.MultiSigAddress.Transactions.Add(newTransaction);
this.AddInputKeysLookupLock(newTransaction);
}
else
{
this.logger.LogTrace("Transaction ID '{0}-{1}' found, updating BlockHeight={2}, BlockHash={3}.", transactionHash, index, blockHeight, blockHash);
// Update the block height and block hash.
if ((foundTransaction.BlockHeight == null) && (blockHeight != null))
{
foundTransaction.BlockHeight = blockHeight;
foundTransaction.BlockHash = blockHash;
}
// Update the block time.
if (block != null)
{
foundTransaction.CreationTime = DateTimeOffset.FromUnixTimeSeconds(block.Header.Time);
}
// Add the Merkle proof now that the transaction is confirmed in a block.
if ((block != null) && (foundTransaction.MerkleProof == null))
{
foundTransaction.MerkleProof = new MerkleBlock(block, new[] { transactionHash }).PartialMerkleTree;
}
}
this.TransactionFoundInternal(script);
}