// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "txmempool.h"
#include "consensus/consensus.h"
#include "consensus/tx_verify.h"
#include "consensus/validation.h"
#include "validation.h"
#include "policy/policy.h"
#include "policy/fees.h"
#include "reverse_iterator.h"
#include "streams.h"
#include "timedata.h"
#include "util.h"
#include "utilmoneystr.h"
#include "utiltime.h"
CTxMemPoolEntry::CTxMemPoolEntry(const CTransactionRef& _tx, const CAmount& _nFee,
int64_t _nTime, unsigned int _entryHeight,
bool _spendsCoinbase, int64_t _sigOpsCost, LockPoints lp):
tx(_tx), nFee(_nFee), nTime(_nTime), entryHeight(_entryHeight),
spendsCoinbase(_spendsCoinbase), sigOpCost(_sigOpsCost), lockPoints(lp)
{
nTxWeight = GetTransactionWeight(*tx);
nUsageSize = RecursiveDynamicUsage(tx);
nCountWithDescendants = 1;
nSizeWithDescendants = GetTxSize();
nModFeesWithDescendants = nFee;
feeDelta = 0;
nCountWithAncestors = 1;
nSizeWithAncestors = GetTxSize();
nModFeesWithAncestors = nFee;
nSigOpCostWithAncestors = sigOpCost;
}
CTxMemPoolEntry::CTxMemPoolEntry(const CTxMemPoolEntry& other)
{
*this = other;
}
void CTxMemPoolEntry::UpdateFeeDelta(int64_t newFeeDelta)
{
nModFeesWithDescendants += newFeeDelta - feeDelta;
nModFeesWithAncestors += newFeeDelta - feeDelta;
feeDelta = newFeeDelta;
}
void CTxMemPoolEntry::UpdateLockPoints(const LockPoints& lp)
{
lockPoints = lp;
}
size_t CTxMemPoolEntry::GetTxSize() const
{
return GetVirtualTransactionSize(nTxWeight, sigOpCost);
}
// Update the given tx for any in-mempool descendants.
// Assumes that setMemPoolChildren is correct for the given tx and all
// descendants.
void CTxMemPool::UpdateForDescendants(txiter updateIt, cacheMap &cachedDescendants, const std::set<uint256> &setExclude)
{
setEntries stageEntries, setAllDescendants;
stageEntries = GetMemPoolChildren(updateIt);
while (!stageEntries.empty()) {
const txiter cit = *stageEntries.begin();
setAllDescendants.insert(cit);
stageEntries.erase(cit);
const setEntries &setChildren = GetMemPoolChildren(cit);
for (const txiter childEntry : setChildren) {
cacheMap::iterator cacheIt = cachedDescendants.find(childEntry);
if (cacheIt != cachedDescendants.end()) {
// We've already calculated this one, just add the entries for this set
// but don't traverse again.
for (const txiter cacheEntry : cacheIt->second) {
setAllDescendants.insert(cacheEntry);
}
} else if (!setAllDescendants.count(childEntry)) {
// Schedule for later processing
stageEntries.insert(childEntry);
}
}
}
// setAllDescendants now contains all in-mempool descendants of updateIt.
// Update and add to cached descendant map
int64_t modifySize = 0;
CAmount modifyFee = 0;
int64_t modifyCount = 0;
for (txiter cit : setAllDescendants) {
if (!setExclude.count(cit->GetTx().GetHash())) {
modifySize += cit->GetTxSize();
modifyFee += cit->GetModifiedFee();
modifyCount++;
cachedDescendants[updateIt].insert(cit);
// Update ancestor state for each descendant
mapTx.modify(cit, update_ancestor_state(updateIt->GetTxSize(), updateIt->GetModifiedFee(), 1, updateIt->GetSigOpCost()));
}
}
mapTx.modify(updateIt, update_descendant_state(modifySize, modifyFee, modifyCount));
}
// vHashesToUpdate is the set of transaction hashes from a disconnected block
// which has been re-added to the mempool.
// for each entry, look for descendants that are outside vHashesToUpdate, and
// add fee/size information for such descendants to the parent.
// for each such descendant, also update the ancestor state to include the parent.
void CTxMemPool::UpdateTransactionsFromBlock(const std::vector<uint256> &vHashesToUpdate)
{
LOCK(cs);
// For each entry in vHashesToUpdate, store the set of in-mempool, but not
// in-vHashesToUpdate transactions, so that we don't have to recalculate
// descendants when we come across a previously seen entry.
cacheMap mapMemPoolDescendantsToUpdate;
// Use a set for lookups into vHashesToUpdate (these entries are already
// accounted for in the state of their ancestors)
std::set<uint256> setAlreadyIncluded(vHashesToUpdate.begin(), vHashesToUpdate.end());
// Iterate in reverse, so that whenever we are looking at a transaction
// we are sure that all in-mempool descendants have already been processed.
// This maximizes the benefit of the descendant cache and guarantees that
// setMemPoolChildren will be updated, an assumption made in
// UpdateForDescendants.
for (const uint256 &hash : reverse_iterate(vHashesToUpdate)) {
// we cache the in-mempool children to avoid duplicate updates
setEntries setChildren;
// calculate children from mapNextTx
txiter it = mapTx.find(hash);
if (it == mapTx.end()) {
continue;
}
auto iter = mapNextTx.lower_bound(COutPoint(hash, 0));
// First calculate the children, and update setMemPoolChildren to
// include them, and update their setMemPoolParents to include this tx.
for (; iter != mapNextTx.end() && iter->first->hash == hash; ++iter) {
const uint256 &childHash = iter->second->GetHash();
txiter childIter = mapTx.find(childHash);
assert(childIter != mapTx.end());
// We can skip updating entries we've encountered before or that
// are in the block (which are already accounted for).
if (setChildren.insert(childIter).second && !setAlreadyIncluded.count(childHash)) {
UpdateChild(it, childIter, true);
UpdateParent(childIter, it, true);
}
}
UpdateForDescendants(it, mapMemPoolDescendantsToUpdate, setAlreadyIncluded);
}
}
bool CTxMemPool::CalculateMemPoolAncestors(const CTxMemPoolEntry &entry, setEntries &setAncestors, uint64_t limitAncestorCount, uint64_t limitAncestorSize, uint64_t limitDescendantCount, uint64_t limitDescendantSize, std::string &errString, bool fSearchForParents /* = true */) const
{
LOCK(cs);
setEntries parentHashes;
const CTransaction &tx = entry.GetTx();
if (fSearchForParents) {
// Get parents of this transaction that are in the mempool
// GetMemPoolParents() is only valid for entries in the mempool, so we
// iterate mapTx to find parents.
for (unsigned int i = 0; i < tx.vin.size(); i++) {
txiter piter = mapTx.find(tx.vin[i].prevout.hash);
if (piter != mapTx.end()) {
parentHashes.insert(piter);
if (parentHashes.size() + 1 > limitAncestorCount) {
errString = strprintf("too many unconfirmed parents [limit: %u]", limitAncestorCount);
return false;
}
}
}
} else {
// If we're not searching for parents, we require this to be an
// entry in the mempool already.
txiter it = mapTx.iterator_to(entry);
parentHashes = GetMemPoolParents(it);
}
size_t totalSizeWithAncestors = entry.GetTxSize();
while (!parentHashes.empty()) {
txiter stageit = *parentHashes.begin();
setAncestors.insert(stageit);
parentHashes.erase(stageit);
totalSizeWithAncestors += stageit->GetTxSize();
if (stageit->GetSizeWithDescendants() + entry.GetTxSize() > limitDescendantSize) {
errString = strprintf("exceeds descendant size limit for tx %s [limit: %u]", stageit->GetTx().GetHash().ToString(), limitDescendantSize);
return false;
} else if (stageit->GetCountWithDescendants() + 1 > limitDescendantCount) {
errString = strprintf("too many descendants for tx %s [limit: %u]", stageit->GetTx().GetHash().ToString(), limitDescendantCount);
return false;
} else if (totalSizeWithAncestors > limitAncestorSize) {
errString = strprintf("exceeds ancestor size limit [limit: %u]", limitAncestorSize);
return false;
}
const setEntries & setMemPoolParents = GetMemPoolParents(stageit);
for (const txiter &phash : setMemPoolParents) {
// If this is a new ancestor, add it.
if (setAncestors.count(phash) == 0) {
parentHashes.insert(phash);
}
if (parentHashes.size() + setAncestors.size() + 1 > limitAncestorCount) {
errString = strprintf("too many unconfirmed ancestors [limit: %u]", limitAncestorCount);
return false;
}
}
}
return true;
}
void CTxMemPool::UpdateAncestorsOf(bool add, txiter it, setEntries &setAncestors)
{
setEntries parentIters = GetMemPoolParents(it);
// add or remove this tx as a child of each parent
for (txiter piter : parentIters) {
UpdateChild(piter, it, add);
}
const int64_t updateCount = (add ? 1 : -1);
const int64_t updateSize = updateCount * it->GetTxSize();
const CAmount updateFee = updateCount * it->GetModifiedFee();
for (txiter ancestorIt : setAncestors) {
mapTx.modify(ancestorIt, update_descendant_state(updateSize, updateFee, updateCount));
}
}
void CTxMemPool::UpdateEntryForAncestors(txiter it, const setEntries &setAncestors)
{
int64_t updateCount = setAncestors.size();
int64_t updateSize = 0;
CAmount updateFee = 0;
int64_t updateSigOpsCost = 0;
for (txiter ancestorIt : setAncestors) {
updateSize += ancestorIt->GetTxSize();
updateFee += ancestorIt->GetModifiedFee();
updateSigOpsCost += ancestorIt->GetSigOpCost();
}
mapTx.modify(it, update_ancestor_state(updateSize, updateFee, updateCount, updateSigOpsCost));
}
void CTxMemPool::UpdateChildrenForRemoval(txiter it)
{
const setEntries &setMemPoolChildren = GetMemPoolChildren(it);
for (txiter updateIt : setMemPoolChildren) {
UpdateParent(updateIt, it, false);
}
}
void CTxMemPool::UpdateForRemoveFromMempool(const setEntries &entriesToRemove, bool updateDescendants)
{
// For each entry, walk back all ancestors and decrement size associated with this
// transaction
const uint64_t nNoLimit = std::numeric_limits<uint64_t>::max();
if (updateDescendants) {
// updateDescendants should be true whenever we're not recursively
// removing a tx and all its descendants, eg when a transaction is
// confirmed in a block.
// Here we only update statistics and not data in mapLinks (which
// we need to preserve until we're finished with all operations that
// need to traverse the mempool).
for (txiter removeIt : entriesToRemove) {
setEntries setDescendants;
CalculateDescendants(removeIt, setDescendants);
setDescendants.erase(removeIt); // don't update state for self
int64_t modifySize = -((int64_t)removeIt->GetTxSize());
CAmount modifyFee = -removeIt->GetModifiedFee();
int modifySigOps = -removeIt->GetSigOpCost();
for (txiter dit : setDescendants) {
mapTx.modify(dit, update_ancestor_state(modifySize, modifyFee, -1, modifySigOps));
}
}
}
for (txiter removeIt : entriesToRemove) {
setEntries setAncestors;
const CTxMemPoolEntry &entry = *removeIt;
std::string dummy;
// Since this is a tx that is already in the mempool, we can call CMPA
// with fSearchForParents = false. If the mempool is in a consistent
// state, then using true or false should both be correct, though false
// should be a bit faster.
// However, if we happen to be in the middle of processing a reorg, then
// the mempool can be in an inconsistent state. In this case, the set
// of ancestors reachable via mapLinks will be the same as the set of
// ancestors whose packages include this transaction, because when we
// add a new transaction to the mempool in addUnchecked(), we assume it
// has no children, and in the case of a reorg where that assumption is
// false, the in-mempool children aren't linked to the in-block tx's
// until UpdateTransactionsFromBlock() is called.
// So if we're being called during a reorg, ie before
// UpdateTransactionsFromBlock() has been called, then mapLinks[] will
// differ from the set of mempool parents we'd calculate by searching,
// and it's important that we use the mapLinks[] notion of ancestor
// transactions as the set of things to update for removal.
CalculateMemPoolAncestors(entry, setAncestors, nNoLimit, nNoLimit, nNoLimit, nNoLimit, dummy, false);
// Note that UpdateAncestorsOf severs the child links that point to
// removeIt in the entries for the parents of removeIt.
UpdateAncestorsOf(false, removeIt, setAncestors);
}
// After updating all the ancestor sizes, we can now sever the link between each
// transaction being removed and any mempool children (ie, update setMemPoolParents
// for each direct child of a transaction being removed).
for (txiter removeIt : entriesToRemove) {
UpdateChildrenForRemoval(removeIt);
}
}
void CTxMemPoolEntry::UpdateDescendantState(int64_t modifySize, CAmount modifyFee, int64_t modifyCount)
{
nSizeWithDescendants += modifySize;
assert(int64_t(nSizeWithDescendants) > 0);
nModFeesWithDescendants += modifyFee;
nCountWithDescendants += modifyCount;
assert(int64_t(nCountWithDescendants) > 0);
}
void CTxMemPoolEntry::UpdateAncestorState(int64_t modifySize, CAmount modifyFee, int64_t modifyCount, int modifySigOps)
{
nSizeWithAncestors += modifySize;
assert(int64_t(nSizeWithAncestors) > 0);
nModFeesWithAncestors += modifyFee;
nCountWithAncestors += modifyCount;
assert(int64_t(nCountWithAncestors) > 0);
nSigOpCostWithAncestors += modifySigOps;
assert(int(nSigOpCostWithAncestors) >= 0);
}
CTxMemPool::CTxMemPool(CBlockPolicyEstimator* estimator) :
nTransactionsUpdated(0), minerPolicyEstimator(estimator)
{
_clear(); //lock free clear
// Sanity checks off by default for performance, because otherwise
// accepting transactions becomes O(N^2) where N is the number
// of transactions in the pool
nCheckFrequency = 0;
}
bool CTxMemPool::isSpent(const COutPoint& outpoint)
{
LOCK(cs);
return mapNextTx.count(outpoint);
}
unsigned int CTxMemPool::GetTransactionsUpdated() const
{
LOCK(cs);
return nTransactionsUpdated;
}
void CTxMemPool::AddTransactionsUpdated(unsigned int n)
{
LOCK(cs);
nTransactionsUpdated += n;
}
bool CTxMemPool::addUnchecked(const uint256& hash, const CTxMemPoolEntry &entry, setEntries &setAncestors, bool validFeeEstimate)
{
NotifyEntryAdded(entry.GetSharedTx());
// Add to memory pool without checking anything.
// Used by AcceptToMemoryPool(), which DOES do
// all the appropriate checks.
LOCK(cs);
indexed_transaction_set::iterator newit = mapTx.insert(entry).first;
mapLinks.insert(make_pair(newit, TxLinks()));
// Update transaction for any feeDelta created by PrioritiseTransaction
// TODO: refactor so that the fee delta is calculated before inserting
// into mapTx.
std::map<uint256, CAmount>::const_iterator pos = mapDeltas.find(hash);
if (pos != mapDeltas.end()) {
const CAmount &delta = pos->second;
if (delta) {
mapTx.modify(newit, update_fee_delta(delta));
}
}
// Update cachedInnerUsage to include contained transaction's usage.
// (When we update the entry for in-mempool parents, memory usage will be
// further updated.)
cachedInnerUsage += entry.DynamicMemoryUsage();
const CTransaction& tx = newit->GetTx();
std::set<uint256> setParentTransactions;
for (unsigned int i = 0; i < tx.vin.size(); i++) {
mapNextTx.insert(std::make_pair(&tx.vin[i].prevout, &tx));
setParentTransactions.insert(tx.vin[i].prevout.hash);
}
// Don't bother worrying about child transactions of this one.
// Normal case of a new transaction arriving is that there can't be any
// children, because such children would be orphans.
// An exception to that is if a transaction enters that used to be in a block.
// In that case, our disconnect block logic will call UpdateTransactionsFromBlock
// to clean up the mess we're leaving here.
// Update ancestors with information about this tx
for (const uint256 &phash : setParentTransactions) {
txiter pit = mapTx.find(phash);
if (pit != mapTx.end()) {
UpdateParent(newit, pit, true);
}
}
UpdateAncestorsOf(true, newit, setAncestors);
UpdateEntryForAncestors(newit, setAncestors);
nTransactionsUpdated++;
totalTxSize += entry.GetTxSize();
if (minerPolicyEstimator) {minerPolicyEstimator->processTransaction(entry, validFeeEstimate);}
vTxHashes.emplace_back(tx.GetWitnessHash(), newit);
newit->vTxHashesIdx = vTxHashes.size() - 1;
return true;
}
void CTxMemPool::removeUnchecked(txiter it, MemPoolRemovalReason reason)
{
NotifyEntryRemoved(it->GetSharedTx(), reason);
const uint256 hash = it->GetTx().GetHash();
for (const CTxIn& txin : it->GetTx().vin)
mapNextTx.erase(txin.prevout);
if (vTxHashes.size() > 1) {
vTxHashes[it->vTxHashesIdx] = std::move(vTxHashes.back());
vTxHashes[it->vTxHashesIdx].second->vTxHashesIdx = it->vTxHashesIdx;
vTxHashes.pop_back();
if (vTxHashes.size() * 2 < vTxHashes.capacity())
vTxHashes.shrink_to_fit();
} else
vTxHashes.clear();
totalTxSize -= it->GetTxSize();
cachedInnerUsage -= it->DynamicMemoryUsage();
cachedInnerUsage -= memusage::DynamicUsage(mapLinks[it].parents) + memusage::DynamicUsage(mapLinks[it].children);
mapLinks.erase(it);
mapTx.erase(it);
nTransactionsUpdated++;
if (minerPolicyEstimator) {minerPolicyEstimator->removeTx(hash, false);}
}
// Calculates descendants of entry that are not already in setDescendants, and adds to
// setDescendants. Assumes entryit is already a tx in the mempool and setMemPoolChildren
// is correct for tx and all descendants.
// Also assumes that if an entry is in setDescendants already, then all
// in-mempool descendants of it are already in setDescendants as well, so that we
// can save time by not iterating over those entries.
void CTxMemPool::CalculateDescendants(txiter entryit, setEntries &setDescendants)
{
setEntries stage;
if (setDescendants.count(entryit) == 0) {
stage.insert(entryit);
}
// Traverse down the children of entry, only adding children that are not
// accounted for in setDescendants already (because those children have either
// already been walked, or will be walked in this iteration).
while (!stage.empty()) {
txiter it = *stage.begin();
setDescendants.insert(it);
stage.erase(it);
const setEntries &setChildren = GetMemPoolChildren(it);
for (const txiter &childiter : setChildren) {
if (!setDescendants.count(childiter)) {
stage.insert(childiter);
}
}
}
}
void CTxMemPool::removeRecursive(const CTransaction &origTx, MemPoolRemovalReason reason)
{
// Remove transaction from memory pool
{
LOCK(cs);
setEntries txToRemove;
txiter origit = mapTx.find(origTx.GetHash());
if (origit != mapTx.end()) {
txToRemove.insert(origit);
} else {
// When recursively removing but origTx isn't in the mempool
// be sure to remove any children that are in the pool. This can
// happen during chain re-orgs if origTx isn't re-accepted into
// the mempool for any reason.
for (unsigned int i = 0; i < origTx.vout.size(); i++) {
auto it = mapNextTx.find(COutPoint(origTx.GetHash(), i));
if (it == mapNextTx.end())
continue;
txiter nextit = mapTx.find(it->second->GetHash());
assert(nextit != mapTx.end());
txToRemove.insert(nextit);
}
}
setEntries setAllRemoves;
for (txiter it : txToRemove) {
CalculateDescendants(it, setAllRemoves);
}
RemoveStaged(setAllRemoves, false, reason);
}
}
void CTxMemPool::removeForReorg(const CCoinsViewCache *pcoins, unsigned int nMemPoolHeight, int flags)
{
// Remove transactions spending a coinbase which are now immature and no-longer-final transactions
LOCK(cs);
setEntries txToRemove;
for (indexed_transaction_set::const_iterator it = mapTx.begin(); it != mapTx.end(); it++) {
const CTransaction& tx = it->GetTx();
LockPoints lp = it->GetLockPoints();
bool validLP = TestLockPointValidity(&lp);
if (!CheckFinalTx(tx, flags) || !CheckSequenceLocks(tx, flags, &lp, validLP)) {
// Note if CheckSequenceLocks fails the LockPoints may still be invalid
// So it's critical that we remove the tx and not depend on the LockPoints.
txToRemove.insert(it);
} else if (it->GetSpendsCoinbase()) {
for (const CTxIn& txin : tx.vin) {
indexed_transaction_set::const_iterator it2 = mapTx.find(txin.prevout.hash);
if (it2 != mapTx.end())
continue;
const Coin &coin = pcoins->AccessCoin(txin.prevout);
if (nCheckFrequency != 0) assert(!coin.IsSpent());
if (coin.IsSpent() || (coin.IsCoinBase() && ((signed long)nMemPoolHeight) - coin.nHeight < COINBASE_MATURITY)) {
txToRemove.insert(it);
break;
}
}
}
if (!validLP) {
mapTx.modify(it, update_lock_points(lp));
}
}
setEntries setAllRemoves;
for (txiter it : txToRemove) {
CalculateDescendants(it, setAllRemoves);
}
RemoveStaged(setAllRemoves, false, MemPoolRemovalReason::REORG);
}
void CTxMemPool::removeConflicts(const CTransaction &tx)
{
// Remove transactions which depend on inputs of tx, recursively
LOCK(cs);
for (const CTxIn &txin : tx.vin) {
auto it = mapNextTx.find(txin.prevout);
if (it != mapNextTx.end()) {
const CTransaction &txConflict = *it->second;
if (txConflict != tx)
{
ClearPrioritisation(txConflict.GetHash());
removeRecursive(txConflict, MemPoolRemovalReason::CONFLICT);
}
}
}
}
/**
* Called when a block is connected. Removes from mempool and updates the miner fee estimator.
*/
void CTxMemPool::removeForBlock(const std::vector<CTransactionRef>& vtx, unsigned int nBlockHeight)
{
LOCK(cs);
std::vector<const CTxMemPoolEntry*> entries;
for (const auto& tx : vtx)
{
uint256 hash = tx->GetHash();
indexed_transaction_set::iterator i = mapTx.find(hash);
if (i != mapTx.end())
entries.push_back(&*i);
}
// Before the txs in the new block have been removed from the mempool, update policy estimates
if (minerPolicyEstimator) {minerPolicyEstimator->processBlock(nBlockHeight, entries);}
for (const auto& tx : vtx)
{
txiter it = mapTx.find(tx->GetHash());
if (it != mapTx.end()) {
setEntries stage;
stage.insert(it);
RemoveStaged(stage, true, MemPoolRemovalReason::BLOCK);
}
removeConflicts(*tx);
ClearPrioritisation(tx->GetHash());
}
lastRollingFeeUpdate = GetTime();
blockSinceLastRollingFeeBump = true;
}
void CTxMemPool::_clear()
{
mapLinks.clear();
mapTx.clear();
mapNextTx.clear();
totalTxSize = 0;
cachedInnerUsage = 0;
lastRollingFeeUpdate = GetTime();
blockSinceLastRollingFeeBump = false;
rollingMinimumFeeRate = 0;
++nTransactionsUpdated;
}
void CTxMemPool::clear()
{
LOCK(cs);
_clear();
}
void CTxMemPool::check(const CCoinsViewCache *pcoins) const
{
if (nCheckFrequency == 0)
return;
if (GetRand(std::numeric_limits<uint32_t>::max()) >= nCheckFrequency)
return;
LogPrint(BCLog::MEMPOOL, "Checking mempool with %u transactions and %u inputs\n", (unsigned int)mapTx.size(), (unsigned int)mapNextTx.size());
uint64_t checkTotal = 0;
uint64_t innerUsage = 0;
CCoinsViewCache mempoolDuplicate(const_cast<CCoinsViewCache*>(pcoins));
const int64_t nSpendHeight = GetSpendHeight(mempoolDuplicate);
LOCK(cs);
std::list<const CTxMemPoolEntry*> waitingOnDependants;
for (indexed_transaction_set::const_iterator it = mapTx.begin(); it != mapTx.end(); it++) {
unsigned int i = 0;
checkTotal += it->GetTxSize();
innerUsage += it->DynamicMemoryUsage();
const CTransaction& tx = it->GetTx();
txlinksMap::const_iterator linksiter = mapLinks.find(it);
assert(linksiter != mapLinks.end());
const TxLinks &links = linksiter->second;
innerUsage += memusage::DynamicUsage(links.parents) + memusage::DynamicUsage(links.children);
bool fDependsWait = false;
setEntries setParentCheck;
int64_t parentSizes = 0;
int64_t parentSigOpCost = 0;
for (const CTxIn &txin : tx.vin) {
// Check that every mempool transaction's inputs refer to available coins, or other mempool tx's.
indexed_transaction_set::const_iterator it2 = mapTx.find(txin.prevout.hash);
if (it2 != mapTx.end()) {
const CTransaction& tx2 = it2->GetTx();
assert(tx2.vout.size() > txin.prevout.n && !tx2.vout[txin.prevout.n].IsNull());
fDependsWait = true;
if (setParentCheck.insert(it2).second) {
parentSizes += it2->GetTxSize();
parentSigOpCost += it2->GetSigOpCost();
}
} else {
assert(pcoins->HaveCoin(txin.prevout));
}
// Check whether its inputs are marked in mapNextTx.
auto it3 = mapNextTx.find(txin.prevout);
assert(it3 != mapNextTx.end());
assert(it3->first == &txin.prevout);
assert(it3->second == &tx);
i++;
}
assert(setParentCheck == GetMemPoolParents(it));
// Verify ancestor state is correct.
setEntries setAncestors;
uint64_t nNoLimit = std::numeric_limits<uint64_t>::max();
std::string dummy;
CalculateMemPoolAncestors(*it, setAncestors, nNoLimit, nNoLimit, nNoLimit, nNoLimit, dummy);
uint64_t nCountCheck = setAncestors.size() + 1;
uint64_t nSizeCheck = it->GetTxSize();
CAmount nFeesCheck = it->GetModifiedFee();
int64_t nSigOpCheck = it->GetSigOpCost();
for (txiter ancestorIt : setAncestors) {
nSizeCheck += ancestorIt->GetTxSize();
nFeesCheck += ancestorIt->GetModifiedFee();
nSigOpCheck += ancestorIt->GetSigOpCost();
}
assert(it->GetCountWithAncestors() == nCountCheck);
assert(it->GetSizeWithAncestors() == nSizeCheck);
assert(it->GetSigOpCostWithAncestors() == nSigOpCheck);
assert(it->GetModFeesWithAncestors() == nFeesCheck);
// Check children against mapNextTx
CTxMemPool::setEntries setChildrenCheck;
auto iter = mapNextTx.lower_bound(COutPoint(it->GetTx().GetHash(), 0));
int64_t childSizes = 0;
for (; iter != mapNextTx.end() && iter->first->hash == it->GetTx().GetHash(); ++iter) {
txiter childit = mapTx.find(iter->second->GetHash());
assert(childit != mapTx.end()); // mapNextTx points to in-mempool transactions
if (setChildrenCheck.insert(childit).second) {
childSizes += childit->GetTxSize();
}
}
assert(setChildrenCheck == GetMemPoolChildren(it));
// Also check to make sure size is greater than sum with immediate children.
// just a sanity check, not definitive that this calc is correct...
assert(it->GetSizeWithDescendants() >= childSizes + it->GetTxSize());
if (fDependsWait)
waitingOnDependants.push_back(&(*it));
else {
CValidationState state;
bool fCheckResult = tx.IsCoinBase() ||
Consensus::CheckTxInputs(tx, state, mempoolDuplicate, nSpendHeight);
assert(fCheckResult);
UpdateCoins(tx, mempoolDuplicate, 1000000);
}
}
unsigned int stepsSinceLastRemove = 0;
while (!waitingOnDependants.empty()) {
const CTxMemPoolEntry* entry = waitingOnDependants.front();
waitingOnDependants.pop_front();
CValidationState state;
if (!mempoolDuplicate.HaveInputs(entry->GetTx())) {
waitingOnDependants.push_back(entry);
stepsSinceLastRemove++;
assert(stepsSinceLastRemove < waitingOnDependants.size());
} else {
bool fCheckResult = entry->GetTx().IsCoinBase() ||
Consensus::CheckTxInputs(entry->GetTx(), state, mempoolDuplicate, nSpendHeight);
assert(fCheckResult);
UpdateCoins(entry->GetTx(), mempoolDuplicate, 1000000);
stepsSinceLastRemove = 0;
}
}
for (auto it = mapNextTx.cbegin(); it != mapNextTx.cend(); it++) {
uint256 hash = it->second->GetHash();
indexed_transaction_set::const_iterator it2 = mapTx.find(hash);
const CTransaction& tx = it2->GetTx();
assert(it2 != mapTx.end());
assert(&tx == it->second);
}
assert(totalTxSize == checkTotal);
assert(innerUsage == cachedInnerUsage);
}
bool CTxMemPool::CompareDepthAndScore(const uint256& hasha, const uint256& hashb)
{
LOCK(cs);
indexed_transaction_set::const_iterator i = mapTx.find(hasha);
if (i == mapTx.end()) return false;
indexed_transaction_set::const_iterator j = mapTx.find(hashb);
if (j == mapTx.end()) return true;
uint64_t counta = i->GetCountWithAncestors();
uint64_t countb = j->GetCountWithAncestors();
if (counta == countb) {
return CompareTxMemPoolEntryByScore()(*i, *j);
}
return counta < countb;
}
namespace {
class DepthAndScoreComparator
{
public:
bool operator()(const CTxMemPool::indexed_transaction_set::const_iterator& a, const CTxMemPool::indexed_transaction_set::const_iterator& b)
{
uint64_t counta = a->GetCountWithAncestors();
uint64_t countb = b->GetCountWithAncestors();
if (counta == countb) {
return CompareTxMemPoolEntryByScore()(*a, *b);
}
return counta < countb;
}
};
} // namespace
std::vector<CTxMemPool::indexed_transaction_set::const_iterator> CTxMemPool::GetSortedDepthAndScore() const
{
std::vector<indexed_transaction_set::const_iterator> iters;
AssertLockHeld(cs);
iters.reserve(mapTx.size());
for (indexed_transaction_set::iterator mi = mapTx.begin(); mi != mapTx.end(); ++mi) {
iters.push_back(mi);
}
std::sort(iters.begin(), iters.end(), DepthAndScoreComparator());
return iters;
}
void CTxMemPool::queryHashes(std::vector<uint256>& vtxid)
{
LOCK(cs);
auto iters = GetSortedDepthAndScore();
vtxid.clear();
vtxid.reserve(mapTx.size());
for (auto it : iters) {
vtxid.push_back(it->GetTx().GetHash());
}
}
static TxMempoolInfo GetInfo(CTxMemPool::indexed_transaction_set::const_iterator it) {
return TxMempoolInfo{it->GetSharedTx(), it->GetTime(), CFeeRate(it->GetFee(), it->GetTxSize()), it->GetModifiedFee() - it->GetFee()};
}
std::vector<TxMempoolInfo> CTxMemPool::infoAll() const
{
LOCK(cs);
auto iters = GetSortedDepthAndScore();
std::vector<TxMempoolInfo> ret;
ret.reserve(mapTx.size());
for (auto it : iters) {
ret.push_back(GetInfo(it));
}
return ret;
}
CTransactionRef CTxMemPool::get(const uint256& hash) const
{
LOCK(cs);
indexed_transaction_set::const_iterator i = mapTx.find(hash);
if (i == mapTx.end())
return nullptr;
return i->GetSharedTx();
}
TxMempoolInfo CTxMemPool::info(const uint256& hash) const
{
LOCK(cs);
indexed_transaction_set::const_iterator i = mapTx.find(hash);
if (i == mapTx.end())
return TxMempoolInfo();
return GetInfo(i);
}
void CTxMemPool::PrioritiseTransaction(const uint256& hash, const CAmount& nFeeDelta)
{
{
LOCK(cs);
CAmount &delta = mapDeltas[hash];
delta += nFeeDelta;
txiter it = mapTx.find(hash);
if (it != mapTx.end()) {
mapTx.modify(it, update_fee_delta(delta));
// Now update all ancestors' modified fees with descendants
setEntries setAncestors;
uint64_t nNoLimit = std::numeric_limits<uint64_t>::max();
std::string dummy;
CalculateMemPoolAncestors(*it, setAncestors, nNoLimit, nNoLimit, nNoLimit, nNoLimit, dummy, false);
for (txiter ancestorIt : setAncestors) {
mapTx.modify(ancestorIt, update_descendant_state(0, nFeeDelta, 0));
}
// Now update all descendants' modified fees with ancestors
setEntries setDescendants;
CalculateDescendants(it, setDescendants);
setDescendants.erase(it);
for (txiter descendantIt : setDescendants) {
mapTx.modify(descendantIt, update_ancestor_state(0, nFeeDelta, 0, 0));
}
++nTransactionsUpdated;
}
}
LogPrintf("PrioritiseTransaction: %s feerate += %s\n", hash.ToString(), FormatMoney(nFeeDelta));
}
void CTxMemPool::ApplyDelta(const uint256 hash, CAmount &nFeeDelta) const
{
LOCK(cs);
std::map<uint256, CAmount>::const_iterator pos = mapDeltas.find(hash);
if (pos == mapDeltas.end())
return;
const CAmount &delta = pos->second;
nFeeDelta += delta;
}
void CTxMemPool::ClearPrioritisation(const uint256 hash)
{
LOCK(cs);
mapDeltas.erase(hash);
}
bool CTxMemPool::HasNoInputsOf(const CTransaction &tx) const
{
for (unsigned int i = 0; i < tx.vin.size(); i++)
if (exists(tx.vin[i].prevout.hash))
return false;
return true;
}
CCoinsViewMemPool::CCoinsViewMemPool(CCoinsView* baseIn, const CTxMemPool& mempoolIn) : CCoinsViewBacked(baseIn), mempool(mempoolIn) { }
bool CCoinsViewMemPool::GetCoin(const COutPoint &outpoint, Coin &coin) const {
// If an entry in the mempool exists, always return that one, as it's guaranteed to never
// conflict with the underlying cache, and it cannot have pruned entries (as it contains full)
// transactions. First checking the underlying cache risks returning a pruned entry instead.
CTransactionRef ptx = mempool.get(outpoint.hash);
if (ptx) {
if (outpoint.n < ptx->vout.size()) {
coin = Coin(ptx->vout[outpoint.n], MEMPOOL_HEIGHT, false);
return true;
} else {
return false;
}
}
return base->GetCoin(outpoint, coin);
}
size_t CTxMemPool::DynamicMemoryUsage() const {
LOCK(cs);
// Estimate the overhead of mapTx to be 15 pointers + an allocation, as no exact formula for boost::multi_index_contained is implemented.
return memusage::MallocUsage(sizeof(CTxMemPoolEntry) + 15 * sizeof(void*)) * mapTx.size() + memusage::DynamicUsage(mapNextTx) + memusage::DynamicUsage(mapDeltas) + memusage::DynamicUsage(mapLinks) + memusage::DynamicUsage(vTxHashes) + cachedInnerUsage;
}
void CTxMemPool::RemoveStaged(setEntries &stage, bool updateDescendants, MemPoolRemovalReason reason) {
AssertLockHeld(cs);
UpdateForRemoveFromMempool(stage, updateDescendants);
for (const txiter& it : stage) {
removeUnchecked(it, reason);
}
}
int CTxMemPool::Expire(int64_t time) {
LOCK(cs);
indexed_transaction_set::index<entry_time>::type::iterator it = mapTx.get<entry_time>().begin();
setEntries toremove;
while (it != mapTx.get<entry_time>().end() && it->GetTime() < time) {
toremove.insert(mapTx.project<0>(it));
it++;
}
setEntries stage;
for (txiter removeit : toremove) {
CalculateDescendants(removeit, stage);
}
RemoveStaged(stage, false, MemPoolRemovalReason::EXPIRY);
return stage.size();
}
bool CTxMemPool::addUnchecked(const uint256&hash, const CTxMemPoolEntry &entry, bool validFeeEstimate)
{
LOCK(cs);
setEntries setAncestors;
uint64_t nNoLimit = std::numeric_limits<uint64_t>::max();
std::string dummy;
CalculateMemPoolAncestors(entry, setAncestors, nNoLimit, nNoLimit, nNoLimit, nNoLimit, dummy);
return addUnchecked(hash, entry, setAncestors, validFeeEstimate);
}
void CTxMemPool::UpdateChild(txiter entry, txiter child, bool add)
{
setEntries s;
if (add && mapLinks[entry].children.insert(child).second) {
cachedInnerUsage += memusage::IncrementalDynamicUsage(s);
} else if (!add && mapLinks[entry].children.erase(child)) {
cachedInnerUsage -= memusage::IncrementalDynamicUsage(s);
}
}
void CTxMemPool::UpdateParent(txiter entry, txiter parent, bool add)
{
setEntries s;
if (add && mapLinks[entry].parents.insert(parent).second) {
cachedInnerUsage += memusage::IncrementalDynamicUsage(s);
} else if (!add && mapLinks[entry].parents.erase(parent)) {
cachedInnerUsage -= memusage::IncrementalDynamicUsage(s);
}
}
const CTxMemPool::setEntries & CTxMemPool::GetMemPoolParents(txiter entry) const
{
assert (entry != mapTx.end());
txlinksMap::const_iterator it = mapLinks.find(entry);
assert(it != mapLinks.end());
return it->second.parents;
}
const CTxMemPool::setEntries & CTxMemPool::GetMemPoolChildren(txiter entry) const
{
assert (entry != mapTx.end());
txlinksMap::const_iterator it = mapLinks.find(entry);
assert(it != mapLinks.end());
return it->second.children;
}
CFeeRate CTxMemPool::GetMinFee(size_t sizelimit) const {
LOCK(cs);
if (!blockSinceLastRollingFeeBump || rollingMinimumFeeRate == 0)
return CFeeRate(rollingMinimumFeeRate);
int64_t time = GetTime();
if (time > lastRollingFeeUpdate + 10) {
double halflife = ROLLING_FEE_HALFLIFE;
if (DynamicMemoryUsage() < sizelimit / 4)
halflife /= 4;
else if (DynamicMemoryUsage() < sizelimit / 2)
halflife /= 2;
rollingMinimumFeeRate = rollingMinimumFeeRate / pow(2.0, (time - lastRollingFeeUpdate) / halflife);
lastRollingFeeUpdate = time;
if (rollingMinimumFeeRate < (double)incrementalRelayFee.GetFeePerK() / 2) {
rollingMinimumFeeRate = 0;
return CFeeRate(0);
}
}
return std::max(CFeeRate(rollingMinimumFeeRate), incrementalRelayFee);
}
void CTxMemPool::trackPackageRemoved(const CFeeRate& rate) {
AssertLockHeld(cs);
if (rate.GetFeePerK() > rollingMinimumFeeRate) {
rollingMinimumFeeRate = rate.GetFeePerK();
blockSinceLastRollingFeeBump = false;
}
}
void CTxMemPool::TrimToSize(size_t sizelimit, std::vector<COutPoint>* pvNoSpendsRemaining) {
LOCK(cs);
unsigned nTxnRemoved = 0;
CFeeRate maxFeeRateRemoved(0);
while (!mapTx.empty() && DynamicMemoryUsage() > sizelimit) {
indexed_transaction_set::index<descendant_score>::type::iterator it = mapTx.get<descendant_score>().begin();
// We set the new mempool min fee to the feerate of the removed set, plus the
// "minimum reasonable fee rate" (ie some value under which we consider txn
// to have 0 fee). This way, we don't allow txn to enter mempool with feerate
// equal to txn which were removed with no block in between.
CFeeRate removed(it->GetModFeesWithDescendants(), it->GetSizeWithDescendants());
removed += incrementalRelayFee;
trackPackageRemoved(removed);
maxFeeRateRemoved = std::max(maxFeeRateRemoved, removed);
setEntries stage;
CalculateDescendants(mapTx.project<0>(it), stage);
nTxnRemoved += stage.size();
std::vector<CTransaction> txn;
if (pvNoSpendsRemaining) {
txn.reserve(stage.size());
for (txiter iter : stage)
txn.push_back(iter->GetTx());
}
RemoveStaged(stage, false, MemPoolRemovalReason::SIZELIMIT);
if (pvNoSpendsRemaining) {
for (const CTransaction& tx : txn) {
for (const CTxIn& txin : tx.vin) {
if (exists(txin.prevout.hash)) continue;
pvNoSpendsRemaining->push_back(txin.prevout);
}
}
}
}
if (maxFeeRateRemoved > CFeeRate(0)) {
LogPrint(BCLog::MEMPOOL, "Removed %u txn, rolling minimum fee bumped to %s\n", nTxnRemoved, maxFeeRateRemoved.ToString());
}
}
bool CTxMemPool::TransactionWithinChainLimit(const uint256& txid, size_t chainLimit) const {
LOCK(cs);
auto it = mapTx.find(txid);
return it == mapTx.end() || (it->GetCountWithAncestors() < chainLimit &&
it->GetCountWithDescendants() < chainLimit);
}
SaltedTxidHasher::SaltedTxidHasher() : k0(GetRand(std::numeric_limits<uint64_t>::max())), k1(GetRand(std::numeric_limits<uint64_t>::max())) {}