public async Task ProcessesOrphans(MempoolBehavior behavior, Transaction tx)
{
Queue <OutPoint> vWorkQueue = new Queue <OutPoint>();
List <uint256> vEraseQueue = new List <uint256>();
var trxHash = tx.GetHash();
for (var index = 0; index < tx.Outputs.Count; index++)
{
vWorkQueue.Enqueue(new OutPoint(trxHash, index));
}
// Recursively process any orphan transactions that depended on this one
List <ulong> setMisbehaving = new List <ulong>();
while (vWorkQueue.Any())
{
// mapOrphanTransactionsByPrev.TryGet() does a .ToList() to take a new collection
// of orphans as this collection may be modifed later by anotehr thread
var itByPrev = await this.MempoolScheduler.ReadAsync(() => this.mapOrphanTransactionsByPrev.TryGet(vWorkQueue.Dequeue())?.ToList());
if (itByPrev == null)
{
continue;
}
foreach (var mi in itByPrev)
{
var orphanTx = mi.Tx; //->second.tx;
var orphanHash = orphanTx.GetHash();
var fromPeer = mi.NodeId; // (*mi)->second.fromPeer;
if (setMisbehaving.Contains(fromPeer))
{
continue;
}
// Use a dummy CValidationState so someone can't setup nodes to counter-DoS based on orphan
// resolution (that is, feeding people an invalid transaction based on LegitTxX in order to get
// anyone relaying LegitTxX banned)
MempoolValidationState stateDummy = new MempoolValidationState(true);
if (await this.Validator.AcceptToMemoryPool(stateDummy, orphanTx))
{
Logging.Logs.Mempool.LogInformation($"accepted orphan tx {orphanHash}");
await behavior.RelayTransaction(orphanTx.GetHash());
this.signals.Transactions.Broadcast(orphanTx);
for (var index = 0; index < orphanTx.Outputs.Count; index++)
{
vWorkQueue.Enqueue(new OutPoint(orphanHash, index));
}
vEraseQueue.Add(orphanHash);
}
else if (!stateDummy.MissingInputs)
{
int nDos = 0;
if (stateDummy.IsInvalid && nDos > 0)
{
// Punish peer that gave us an invalid orphan tx
//Misbehaving(fromPeer, nDos);
setMisbehaving.Add(fromPeer);
Logging.Logs.Mempool.LogInformation($"invalid orphan tx {orphanHash}");
}
// Has inputs but not accepted to mempool
// Probably non-standard or insufficient fee/priority
Logging.Logs.Mempool.LogInformation($"removed orphan tx {orphanHash}");
vEraseQueue.Add(orphanHash);
if (!orphanTx.HasWitness && !stateDummy.CorruptionPossible)
{
// Do not use rejection cache for witness transactions or
// witness-stripped transactions, as they can have been malleated.
// See https://github.com/bitcoin/bitcoin/issues/8279 for details.
await this.MempoolScheduler.WriteAsync(() => this.recentRejects.TryAdd(orphanHash, orphanHash));
}
}
this.memPool.Check(new MempoolCoinView(this.coinView, this.memPool, this.MempoolScheduler, this.Validator));
}
}
foreach (var hash in vEraseQueue)
{
await this.EraseOrphanTx(hash);
}
}
private async Task AcceptToMemoryPoolWorker(MempoolValidationState state, Transaction tx, List <uint256> vHashTxnToUncache)
{
var context = new MempoolValidationContext(tx, state);
this.PreMempoolChecks(context);
// create the MemPoolCoinView and load relevant utxoset
context.View = new MempoolCoinView(this.coinView, this.memPool, this.mempoolScheduler);
await context.View.LoadView(context.Transaction).ConfigureAwait(false);
// adding to the mem pool can only be done sequentially
// use the sequential scheduler for that.
await this.mempoolScheduler.WriteAsync(() =>
{
// is it already in the memory pool?
if (this.memPool.Exists(context.TransactionHash))
{
state.Invalid(MempoolErrors.InPool).Throw();
}
// Check for conflicts with in-memory transactions
this.CheckConflicts(context);
this.CheckMempoolCoinView(context);
this.CreateMempoolEntry(context, state.AcceptTime);
this.CheckSigOps(context);
this.CheckFee(context);
this.CheckRateLimit(context, state.LimitFree);
this.CheckAncestors(context);
this.CheckReplacment(context);
this.CheckAllInputs(context);
// Remove conflicting transactions from the mempool
foreach (var it in context.AllConflicting)
{
Logging.Logs.Mempool.LogInformation(
$"replacing tx {it.TransactionHash} with {context.TransactionHash} for {context.ModifiedFees - context.ConflictingFees} BTC additional fees, {context.EntrySize - context.ConflictingSize} delta bytes");
}
this.memPool.RemoveStaged(context.AllConflicting, false);
// This transaction should only count for fee estimation if
// the node is not behind and it is not dependent on any other
// transactions in the mempool
bool validForFeeEstimation = IsCurrentForFeeEstimation() && this.memPool.HasNoInputsOf(tx);
// Store transaction in memory
this.memPool.AddUnchecked(context.TransactionHash, context.Entry, context.SetAncestors, validForFeeEstimation);
// trim mempool and check if tx was trimmed
if (!state.OverrideMempoolLimit)
{
LimitMempoolSize(this.nodeArgs.Mempool.MaxMempool * 1000000, this.nodeArgs.Mempool.MempoolExpiry * 60 * 60);
if (!this.memPool.Exists(context.TransactionHash))
{
state.Fail(MempoolErrors.Full).Throw();
}
}
// do this here inside the exclusive scheduler for better accuracy
// and to avoid springing more concurrent tasks later
state.MempoolSize = this.memPool.Size;
state.MempoolDynamicSize = this.memPool.DynamicMemoryUsage();
this.PerformanceCounter.SetMempoolSize(state.MempoolSize);
this.PerformanceCounter.SetMempoolDynamicSize(state.MempoolDynamicSize);
this.PerformanceCounter.AddHitCount(1);
});
// GetMainSignals().SyncTransaction(tx, NULL, CMainSignals::SYNC_TRANSACTION_NOT_IN_BLOCK);
}
public Task <bool> AcceptToMemoryPool(MempoolValidationState state, Transaction tx)
{
state.AcceptTime = dateTimeProvider.GetTime();
return(AcceptToMemoryPoolWithTime(state, tx));
}
public MempoolErrorException(MempoolValidationState state) : base(state.ErrorMessage)
{
ValidationState = state;
}
