public bool Process(SmartTransaction tx)
{
if (!tx.Transaction.PossiblyP2WPKHInvolved())
{
return(false); // We do not care about non-witness transactions for other than mempool cleanup.
}
uint256 txId = tx.GetHash();
var walletRelevant = false;
if (tx.Confirmed)
{
foreach (var coin in Coins.AsAllCoinsView().CreatedBy(txId))
{
coin.Height = tx.Height;
walletRelevant = true; // relevant
}
if (walletRelevant)
{
TransactionStore.AddOrUpdate(tx);
}
}
if (!tx.Transaction.IsCoinBase && !walletRelevant) // Transactions we already have and processed would be "double spends" but they shouldn't.
{
var doubleSpends = new List <SmartCoin>();
foreach (SmartCoin coin in Coins.AsAllCoinsView())
{
var spent = false;
foreach (TxoRef spentOutput in coin.SpentOutputs)
{
foreach (TxIn txIn in tx.Transaction.Inputs)
{
if (spentOutput.TransactionId == txIn.PrevOut.Hash && spentOutput.Index == txIn.PrevOut.N) // Do not do (spentOutput == txIn.PrevOut), it's faster this way, because it won't check for null.
{
doubleSpends.Add(coin);
spent = true;
walletRelevant = true;
break;
}
}
if (spent)
{
break;
}
}
}
if (doubleSpends.Any())
{
if (tx.Height == Height.Mempool)
{
// if the received transaction is spending at least one input already
// spent by a previous unconfirmed transaction signaling RBF then it is not a double
// spanding transaction but a replacement transaction.
var isReplacemenetTx = doubleSpends.Any(x => x.IsReplaceable && !x.Confirmed);
if (isReplacemenetTx)
{
// Undo the replaced transaction by removing the coins it created (if other coin
// spends it, remove that too and so on) and restoring those that it destroyed
// ones. After undoing the replaced transaction it will process the replacement
// transaction.
var replacedTxId = doubleSpends.First().TransactionId;
var(destroyed, restored) = Coins.Undo(replacedTxId);
ReplaceTransactionReceived?.Invoke(this, new ReplaceTransactionReceivedEventArgs(tx, destroyed, restored));
foreach (var replacedTransactionId in destroyed.Select(coin => coin.TransactionId))
{
TransactionStore.MempoolStore.TryRemove(replacedTransactionId, out _);
}
tx.SetReplacement();
walletRelevant = true;
}
else
{
DoubleSpendReceived?.Invoke(this, new DoubleSpendReceivedEventArgs(tx, Enumerable.Empty <SmartCoin>()));
return(false);
}
}
else // new confirmation always enjoys priority
{
// remove double spent coins recursively (if other coin spends it, remove that too and so on), will add later if they came to our keys
foreach (SmartCoin doubleSpentCoin in doubleSpends)
{
Coins.Remove(doubleSpentCoin);
}
DoubleSpendReceived?.Invoke(this, new DoubleSpendReceivedEventArgs(tx, doubleSpends));
var unconfirmedDoubleSpentTxId = doubleSpends.First().TransactionId;
TransactionStore.MempoolStore.TryRemove(unconfirmedDoubleSpentTxId, out _);
walletRelevant = true;
}
}
}
var isLikelyCoinJoinOutput = false;
bool hasEqualOutputs = tx.Transaction.GetIndistinguishableOutputs(includeSingle: false).FirstOrDefault() != default;
if (hasEqualOutputs)
{
var receiveKeys = KeyManager.GetKeys(x => tx.Transaction.Outputs.Any(y => y.ScriptPubKey == x.P2wpkhScript));
bool allReceivedInternal = receiveKeys.All(x => x.IsInternal);
if (allReceivedInternal)
{
// It is likely a coinjoin if the diff between receive and sent amount is small and have at least 2 equal outputs.
Money spentAmount = Coins.OutPoints(tx.Transaction.Inputs.ToTxoRefs()).TotalAmount();
Money receivedAmount = tx.Transaction.Outputs.Where(x => receiveKeys.Any(y => y.P2wpkhScript == x.ScriptPubKey)).Sum(x => x.Value);
bool receivedAlmostAsMuchAsSpent = spentAmount.Almost(receivedAmount, Money.Coins(0.005m));
if (receivedAlmostAsMuchAsSpent)
{
isLikelyCoinJoinOutput = true;
}
}
}
List <SmartCoin> newCoins = new List <SmartCoin>();
List <SmartCoin> spentOwnCoins = null;
for (var i = 0U; i < tx.Transaction.Outputs.Count; i++)
{
// If transaction received to any of the wallet keys:
var output = tx.Transaction.Outputs[i];
HdPubKey foundKey = KeyManager.GetKeyForScriptPubKey(output.ScriptPubKey);
if (foundKey != default)
{
walletRelevant = true;
if (output.Value <= DustThreshold)
{
continue;
}
foundKey.SetKeyState(KeyState.Used, KeyManager);
spentOwnCoins ??= Coins.OutPoints(tx.Transaction.Inputs.ToTxoRefs()).ToList();
var anonset = tx.Transaction.GetAnonymitySet(i);
if (spentOwnCoins.Count != 0)
{
anonset += spentOwnCoins.Min(x => x.AnonymitySet) - 1; // Minus 1, because do not count own.
}
SmartCoin newCoin = new SmartCoin(txId, i, output.ScriptPubKey, output.Value, tx.Transaction.Inputs.ToTxoRefs().ToArray(), tx.Height, tx.IsRBF, anonset, isLikelyCoinJoinOutput, foundKey.Label, spenderTransactionId: null, false, pubKey: foundKey); // Do not inherit locked status from key, that's different.
// If we did not have it.
if (Coins.TryAdd(newCoin))
{
newCoins.Add(newCoin);
// Make sure there's always 21 clean keys generated and indexed.
KeyManager.AssertCleanKeysIndexed(isInternal: foundKey.IsInternal);
if (foundKey.IsInternal)
{
// Make sure there's always 14 internal locked keys generated and indexed.
KeyManager.AssertLockedInternalKeysIndexed(14);
}
}
else // If we had this coin already.
{
if (newCoin.Height != Height.Mempool) // Update the height of this old coin we already had.
{
SmartCoin oldCoin = Coins.AsAllCoinsView().GetByOutPoint(new OutPoint(txId, i));
if (oldCoin != null) // Just to be sure, it is a concurrent collection.
{
oldCoin.Height = newCoin.Height;
}
}
}
}
}
// If spends any of our coin
for (var i = 0; i < tx.Transaction.Inputs.Count; i++)
{
var input = tx.Transaction.Inputs[i];
var foundCoin = Coins.GetByOutPoint(input.PrevOut);
if (foundCoin != null)
{
walletRelevant = true;
var alreadyKnown = foundCoin.SpenderTransactionId == txId;
foundCoin.SpenderTransactionId = txId;
if (!alreadyKnown)
{
Coins.Spend(foundCoin);
CoinSpent?.Invoke(this, foundCoin);
}
if (tx.Confirmed)
{
SpenderConfirmed?.Invoke(this, foundCoin);
}
}
}
if (walletRelevant)
{
TransactionStore.AddOrUpdate(tx);
}
foreach (var newCoin in newCoins)
{
CoinReceived?.Invoke(this, newCoin);
}
return(walletRelevant);
}
private ProcessedResult ProcessNoLock(SmartTransaction tx)
{
var result = new ProcessedResult(tx);
// We do not care about non-witness transactions for other than mempool cleanup.
if (tx.Transaction.PossiblyP2WPKHInvolved())
{
uint256 txId = tx.GetHash();
// Performance ToDo: txids could be cached in a hashset here by the AllCoinsView and then the contains would be fast.
if (!tx.Transaction.IsCoinBase && !Coins.AsAllCoinsView().CreatedBy(txId).Any()) // Transactions we already have and processed would be "double spends" but they shouldn't.
{
var doubleSpends = new List <SmartCoin>();
foreach (var txin in tx.Transaction.Inputs)
{
if (Coins.TryGetSpenderSmartCoinsByOutPoint(txin.PrevOut, out var coins))
{
doubleSpends.AddRange(coins);
}
}
if (doubleSpends.Any())
{
if (tx.Height == Height.Mempool)
{
// if the received transaction is spending at least one input already
// spent by a previous unconfirmed transaction signaling RBF then it is not a double
// spending transaction but a replacement transaction.
var isReplacemenetTx = doubleSpends.Any(x => x.IsReplaceable && !x.Confirmed);
if (isReplacemenetTx)
{
// Undo the replaced transaction by removing the coins it created (if other coin
// spends it, remove that too and so on) and restoring those that it replaced.
// After undoing the replaced transaction it will process the replacement transaction.
var replacedTxId = doubleSpends.First().TransactionId;
var(replaced, restored) = Coins.Undo(replacedTxId);
result.ReplacedCoins.AddRange(replaced);
result.RestoredCoins.AddRange(restored);
foreach (var replacedTransactionId in replaced.Select(coin => coin.TransactionId))
{
TransactionStore.MempoolStore.TryRemove(replacedTransactionId, out _);
}
tx.SetReplacement();
}
else
{
return(result);
}
}
else // new confirmation always enjoys priority
{
// remove double spent coins recursively (if other coin spends it, remove that too and so on), will add later if they came to our keys
foreach (SmartCoin doubleSpentCoin in doubleSpends)
{
Coins.Remove(doubleSpentCoin);
}
result.SuccessfullyDoubleSpentCoins.AddRange(doubleSpends);
var unconfirmedDoubleSpentTxId = doubleSpends.First().TransactionId;
TransactionStore.MempoolStore.TryRemove(unconfirmedDoubleSpentTxId, out _);
}
}
}
List <SmartCoin> spentOwnCoins = null;
for (var i = 0U; i < tx.Transaction.Outputs.Count; i++)
{
// If transaction received to any of the wallet keys:
var output = tx.Transaction.Outputs[i];
HdPubKey foundKey = KeyManager.GetKeyForScriptPubKey(output.ScriptPubKey);
if (foundKey != default)
{
if (output.Value <= DustThreshold)
{
result.ReceivedDusts.Add(output);
continue;
}
foundKey.SetKeyState(KeyState.Used, KeyManager);
spentOwnCoins ??= Coins.OutPoints(tx.Transaction.Inputs).ToList();
var anonset = tx.Transaction.GetAnonymitySet(i);
if (spentOwnCoins.Count != 0)
{
anonset += spentOwnCoins.Min(x => x.AnonymitySet) - 1; // Minus 1, because do not count own.
}
SmartCoin newCoin = new SmartCoin(txId, i, output.ScriptPubKey, output.Value, tx.Transaction.Inputs.ToTxoRefs().ToArray(), tx.Height, tx.IsRBF, anonset, foundKey.Label, spenderTransactionId: null, false, pubKey: foundKey); // Do not inherit locked status from key, that's different.
result.ReceivedCoins.Add(newCoin);
// If we did not have it.
if (Coins.TryAdd(newCoin))
{
result.NewlyReceivedCoins.Add(newCoin);
// Make sure there's always 21 clean keys generated and indexed.
KeyManager.AssertCleanKeysIndexed(isInternal: foundKey.IsInternal);
if (foundKey.IsInternal)
{
// Make sure there's always 14 internal locked keys generated and indexed.
KeyManager.AssertLockedInternalKeysIndexed(14);
}
}
else // If we had this coin already.
{
if (newCoin.Height != Height.Mempool) // Update the height of this old coin we already had.
{
SmartCoin oldCoin = Coins.AsAllCoinsView().GetByOutPoint(new OutPoint(txId, i));
if (oldCoin is { }) // Just to be sure, it is a concurrent collection.