/// <summary>
/// Calculates the priority of a transaction based upon transaction size and priority inputs.
/// </summary>
/// <param name="trx">Memory pool transaction.</param>
/// <param name="dPriorityInputs">Priority weighting of inputs.</param>
/// <param name="nTxSize">Transaction size, 0 will compute.</param>
/// <returns>Priority value.</returns>
private double ComputePriority(Transaction trx, double dPriorityInputs, int nTxSize = 0)
{
nTxSize = MempoolValidator.CalculateModifiedSize(this.network.Consensus.ConsensusFactory, nTxSize, trx, this.mempoolValidator.ConsensusOptions);
if (nTxSize == 0)
{
return(0.0);
}
return(dPriorityInputs / nTxSize);
}
/// <summary>
/// Add an orphan transaction to the orphan pool.
/// </summary>
/// <param name="nodeId">Node id of the source node.</param>
/// <param name="tx">The transaction to add.</param>
/// <returns>Whether the orphan transaction was added.</returns>
public bool AddOrphanTx(ulong nodeId, Transaction tx)
{
lock (this.lockObject)
{
uint256 hash = tx.GetHash();
if (this.mapOrphanTransactions.ContainsKey(hash))
{
this.logger.LogTrace("(-)[DUP_ORPH]:false");
return(false);
}
// Ignore big transactions, to avoid a
// send-big-orphans memory exhaustion attack. If a peer has a legitimate
// large transaction with a missing parent then we assume
// it will rebroadcast it later, after the parent transaction(s)
// have been mined or received.
// 100 orphans, each of which is at most 99,999 bytes big is
// at most 10 megabytes of orphans and somewhat more byprev index (in the worst case):
int sz = MempoolValidator.GetTransactionWeight(tx, this.chainIndexer.Network.Consensus.ConsensusFactory, this.Validator.ConsensusOptions);
if (sz >= this.chainIndexer.Network.Consensus.Options.MaxStandardTxWeight)
{
this.logger.LogDebug("ignoring large orphan tx (size: {0}, hash: {1})", sz, hash);
this.logger.LogTrace("(-)[LARGE_ORPH]:false");
return(false);
}
var orphan = new OrphanTx
{
Tx = tx,
NodeId = nodeId,
TimeExpire = this.dateTimeProvider.GetTime() + OrphanTxExpireTime
};
if (this.mapOrphanTransactions.TryAdd(hash, orphan))
{
foreach (TxIn txin in tx.Inputs)
{
List <OrphanTx> prv = this.mapOrphanTransactionsByPrev.TryGet(txin.PrevOut);
if (prv == null)
{
prv = new List <OrphanTx>();
this.mapOrphanTransactionsByPrev.Add(txin.PrevOut, prv);
}
prv.Add(orphan);
}
}
int orphanSize = this.mapOrphanTransactions.Count;
this.logger.LogDebug("stored orphan tx {0} (mapsz {1} outsz {2})", hash, orphanSize, this.mapOrphanTransactionsByPrev.Count);
this.Validator.PerformanceCounter.SetMempoolOrphanSize(orphanSize);
}
return(true);
}
/// <summary>
/// Constructs a transaction memory pool entry.
/// </summary>
/// <param name="transaction">Transaction for the entry.</param>
/// <param name="nFee">Fee for the transaction in the entry in the memory pool.</param>
/// <param name="nTime">The local time when entering the memory pool.</param>
/// <param name="entryPriority">Priority when entering the memory pool.</param>
/// <param name="entryHeight">The chain height when entering the mempool.</param>
/// <param name="inChainInputValue">The sum of all txin values that are already in blockchain.</param>
/// <param name="spendsCoinbase">Whether the transaction spends a coinbase.</param>
/// <param name="nSigOpsCost">The total signature operations cost.</param>
/// <param name="lp">Tthe lock points that track the height and time at which tx was final.</param>
/// <param name="consensusOptions">Proof of work consensus options used to compute transaction weight and modified size.</param>
public TxMempoolEntry(Transaction transaction, Money nFee,
long nTime, double entryPriority, int entryHeight,
Money inChainInputValue, bool spendsCoinbase,
long nSigOpsCost, LockPoints lp, ConsensusOptions consensusOptions,
ConsensusFactory consensusFactory)
{
this.Transaction = transaction;
this.TransactionHash = transaction.GetHash();
this.Fee = nFee;
this.Time = nTime;
this.entryPriority = entryPriority;
this.EntryHeight = entryHeight;
this.InChainInputValue = inChainInputValue;
this.SpendsCoinbase = spendsCoinbase;
this.SigOpCost = nSigOpsCost;
this.LockPoints = lp;
this.consensusOptions = consensusOptions;
this.consensusFactory = consensusFactory;
this.TxWeight = MempoolValidator.GetTransactionWeight(transaction, consensusFactory, consensusOptions);
this.nModSize = MempoolValidator.CalculateModifiedSize(consensusFactory, this.Transaction.GetSerializedSize(), this.Transaction, consensusOptions);
this.nUsageSize = transaction.GetSerializedSize(); // RecursiveDynamicUsage(*tx) + memusage::DynamicUsage(Transaction);
this.CountWithDescendants = 1;
this.SizeWithDescendants = this.GetTxSize();
this.ModFeesWithDescendants = this.Fee;
Money nValueIn = transaction.TotalOut + this.Fee;
Guard.Assert(this.InChainInputValue <= nValueIn);
this.feeDelta = 0;
this.CountWithAncestors = 1;
this.SizeWithAncestors = this.GetTxSize();
this.ModFeesWithAncestors = this.Fee;
this.SigOpCostWithAncestors = this.SigOpCost;
}
