CTxMemPool stores valid-according-to-the-current-best-chain transactions that may be included in the next block. More...

#include <txmempool.h>

Collaboration diagram for CTxMemPool:

[legend]

Classes
struct	CompareIteratorByHash

struct	TxLinks

Public Types
typedef boost::multi_index_container< CTxMemPoolEntry, boost::multi_index::indexed_by< boost::multi_index::hashed_unique< mempoolentry_txid, SaltedTxidHasher >, boost::multi_index::ordered_non_unique< boost::multi_index::tag< descendant_score >, boost::multi_index::identity< CTxMemPoolEntry >, CompareTxMemPoolEntryByDescendantScore >, boost::multi_index::ordered_non_unique< boost::multi_index::tag< entry_time >, boost::multi_index::identity< CTxMemPoolEntry >, CompareTxMemPoolEntryByEntryTime >, boost::multi_index::ordered_non_unique< boost::multi_index::tag< ancestor_score >, boost::multi_index::identity< CTxMemPoolEntry >, CompareTxMemPoolEntryByAncestorFee > > >	indexed_transaction_set

using	txiter = indexed_transaction_set::nth_index< 0 >::type::const_iterator

typedef std::set< txiter, CompareIteratorByHash >	setEntries

Public Member Functions
indexed_transaction_set mapTx	GUARDED_BY (cs)

std::vector< std::pair< uint256, txiter > > vTxHashes	GUARDED_BY (cs)
	All tx witness hashes/entries in mapTx, in random order. More...

const setEntries &	GetMemPoolParents (txiter entry) const EXCLUSIVE_LOCKS_REQUIRED(cs)

const setEntries &	GetMemPoolChildren (txiter entry) const EXCLUSIVE_LOCKS_REQUIRED(cs)

uint64_t	CalculateDescendantMaximum (txiter entry) const EXCLUSIVE_LOCKS_REQUIRED(cs)

indirectmap< COutPoint, const CTransaction * > mapNextTx	GUARDED_BY (cs)

	CTxMemPool (CBlockPolicyEstimator *estimator=nullptr)
	Create a new CTxMemPool. More...

void	check (const CCoinsViewCache *pcoins) const
	If sanity-checking is turned on, check makes sure the pool is consistent (does not contain two transactions that spend the same inputs, all inputs are in the mapNextTx array). More...

void	setSanityCheck (double dFrequency=1.0)

void	addUnchecked (const CTxMemPoolEntry &entry, bool validFeeEstimate=true) EXCLUSIVE_LOCKS_REQUIRED(cs

void	addUnchecked (const CTxMemPoolEntry &entry, setEntries &setAncestors, bool validFeeEstimate=true) EXCLUSIVE_LOCKS_REQUIRED(cs

void	removeRecursive (const CTransaction &tx, MemPoolRemovalReason reason) EXCLUSIVE_LOCKS_REQUIRED(cs)

void	removeForReorg (const CCoinsViewCache *pcoins, unsigned int nMemPoolHeight, int flags) EXCLUSIVE_LOCKS_REQUIRED(cs

void	removeConflicts (const CTransaction &tx) EXCLUSIVE_LOCKS_REQUIRED(cs)

void	removeForBlock (const std::vector< CTransactionRef > &vtx, unsigned int nBlockHeight) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Called when a block is connected. More...

void	clear ()

void	_clear () EXCLUSIVE_LOCKS_REQUIRED(cs)

bool	CompareDepthAndScore (const uint256 &hasha, const uint256 &hashb)

void	queryHashes (std::vector< uint256 > &vtxid) const

bool	isSpent (const COutPoint &outpoint) const

unsigned int	GetTransactionsUpdated () const

void	AddTransactionsUpdated (unsigned int n)

bool	HasNoInputsOf (const CTransaction &tx) const EXCLUSIVE_LOCKS_REQUIRED(cs)
	Check that none of this transactions inputs are in the mempool, and thus the tx is not dependent on other mempool transactions to be included in a block. More...

void	PrioritiseTransaction (const uint256 &hash, const CAmount &nFeeDelta)
	Affect CreateNewBlock prioritisation of transactions. More...

void	ApplyDelta (const uint256 hash, CAmount &nFeeDelta) const

void	ClearPrioritisation (const uint256 hash)

const CTransaction *	GetConflictTx (const COutPoint &prevout) const EXCLUSIVE_LOCKS_REQUIRED(cs)
	Get the transaction in the pool that spends the same prevout. More...

Optional< txiter >	GetIter (const uint256 &txid) const EXCLUSIVE_LOCKS_REQUIRED(cs)
	Returns an iterator to the given hash, if found. More...

setEntries	GetIterSet (const std::set< uint256 > &hashes) const EXCLUSIVE_LOCKS_REQUIRED(cs)
	Translate a set of hashes into a set of pool iterators to avoid repeated lookups. More...

void	RemoveStaged (setEntries &stage, bool updateDescendants, MemPoolRemovalReason reason) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Remove a set of transactions from the mempool. More...

void	UpdateTransactionsFromBlock (const std::vector< uint256 > &vHashesToUpdate) EXCLUSIVE_LOCKS_REQUIRED(cs
	When adding transactions from a disconnected block back to the mempool, new mempool entries may have children in the mempool (which is generally not the case when otherwise adding transactions). More...

bool	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 EXCLUSIVE_LOCKS_REQUIRED(cs)
	Try to calculate all in-mempool ancestors of entry. More...

void	CalculateDescendants (txiter it, setEntries &setDescendants) const EXCLUSIVE_LOCKS_REQUIRED(cs)
	Populate setDescendants with all in-mempool descendants of hash. More...

CFeeRate	GetMinFee (size_t sizelimit) const
	The minimum fee to get into the mempool, which may itself not be enough for larger-sized transactions. More...

void	TrimToSize (size_t sizelimit, std::vector< COutPoint > *pvNoSpendsRemaining=nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Remove transactions from the mempool until its dynamic size is <= sizelimit. More...

int	Expire (std::chrono::seconds time) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Expire all transaction (and their dependencies) in the mempool older than time. More...

void	GetTransactionAncestry (const uint256 &txid, size_t &ancestors, size_t &descendants) const
	Calculate the ancestor and descendant count for the given transaction. More...

bool	IsLoaded () const

void	SetIsLoaded (bool loaded)
	Sets the current loaded state. More...

unsigned long	size () const

uint64_t	GetTotalTxSize () const

bool	exists (const uint256 &hash) const

CTransactionRef	get (const uint256 &hash) const

TxMempoolInfo	info (const uint256 &hash) const

std::vector< TxMempoolInfo >	infoAll () const

size_t	DynamicMemoryUsage () const

Public Attributes
RecursiveMutex	cs
	This mutex needs to be locked when accessing `mapTx` or other members that are guarded by it. More...

std::map< uint256, CAmount >	mapDeltas

void	cs_main

boost::signals2::signal< void(CTransactionRef)>	NotifyEntryAdded

boost::signals2::signal< void(CTransactionRef, MemPoolRemovalReason)>	NotifyEntryRemoved

Static Public Attributes
static const int	ROLLING_FEE_HALFLIFE = 60 * 60 * 12

Private Types
typedef std::map< txiter, setEntries, CompareIteratorByHash >	cacheMap

typedef std::map< txiter, TxLinks, CompareIteratorByHash >	txlinksMap

Private Member Functions
uint32_t nCheckFrequency	GUARDED_BY (cs)
	Value n means that n times in 2^32 we check. More...

void	trackPackageRemoved (const CFeeRate &rate) EXCLUSIVE_LOCKS_REQUIRED(cs)

bool m_is_loaded	GUARDED_BY (cs)

void	UpdateParent (txiter entry, txiter parent, bool add)

void	UpdateChild (txiter entry, txiter child, bool add)

std::vector< indexed_transaction_set::const_iterator >	GetSortedDepthAndScore () const EXCLUSIVE_LOCKS_REQUIRED(cs)

void	UpdateForDescendants (txiter updateIt, cacheMap &cachedDescendants, const std::set< uint256 > &setExclude) EXCLUSIVE_LOCKS_REQUIRED(cs)
	UpdateForDescendants is used by UpdateTransactionsFromBlock to update the descendants for a single transaction that has been added to the mempool but may have child transactions in the mempool, eg during a chain reorg. More...

void	UpdateAncestorsOf (bool add, txiter hash, setEntries &setAncestors) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Update ancestors of hash to add/remove it as a descendant transaction. More...

void	UpdateEntryForAncestors (txiter it, const setEntries &setAncestors) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Set ancestor state for an entry. More...

void	UpdateForRemoveFromMempool (const setEntries &entriesToRemove, bool updateDescendants) EXCLUSIVE_LOCKS_REQUIRED(cs)
	For each transaction being removed, update ancestors and any direct children. More...

void	UpdateChildrenForRemoval (txiter entry) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Sever link between specified transaction and direct children. More...

void	removeUnchecked (txiter entry, MemPoolRemovalReason reason) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Before calling removeUnchecked for a given transaction, UpdateForRemoveFromMempool must be called on the entire (dependent) set of transactions being removed at the same time. More...

Private Attributes
std::atomic< unsigned int >	nTransactionsUpdated
	Used by getblocktemplate to trigger CreateNewBlock() invocation. More...

CBlockPolicyEstimator *	minerPolicyEstimator

uint64_t	totalTxSize
	sum of all mempool tx's virtual sizes. Differs from serialized tx size since witness data is discounted. Defined in BIP 141. More...

uint64_t	cachedInnerUsage
	sum of dynamic memory usage of all the map elements (NOT the maps themselves) More...

int64_t	lastRollingFeeUpdate

bool	blockSinceLastRollingFeeBump

double	rollingMinimumFeeRate
	minimum fee to get into the pool, decreases exponentially More...

txlinksMap	mapLinks

Detailed Description

CTxMemPool stores valid-according-to-the-current-best-chain transactions that may be included in the next block.

Transactions are added when they are seen on the network (or created by the local node), but not all transactions seen are added to the pool. For example, the following new transactions will not be added to the mempool:

a transaction which doesn't meet the minimum fee requirements.
a new transaction that double-spends an input of a transaction already in the pool where the new transaction does not meet the Replace-By-Fee requirements as defined in BIP 125.
a non-standard transaction.

CTxMemPool::mapTx, and CTxMemPoolEntry bookkeeping:

mapTx is a boost::multi_index that sorts the mempool on 4 criteria:

transaction hash
descendant feerate [we use max(feerate of tx, feerate of tx with all descendants)]
time in mempool
ancestor feerate [we use min(feerate of tx, feerate of tx with all unconfirmed ancestors)]

Note: the term "descendant" refers to in-mempool transactions that depend on this one, while "ancestor" refers to in-mempool transactions that a given transaction depends on.

In order for the feerate sort to remain correct, we must update transactions in the mempool when new descendants arrive. To facilitate this, we track the set of in-mempool direct parents and direct children in mapLinks. Within each CTxMemPoolEntry, we track the size and fees of all descendants.

Usually when a new transaction is added to the mempool, it has no in-mempool children (because any such children would be an orphan). So in addUnchecked(), we:

update a new entry's setMemPoolParents to include all in-mempool parents
update the new entry's direct parents to include the new tx as a child
update all ancestors of the transaction to include the new tx's size/fee

When a transaction is removed from the mempool, we must:

update all in-mempool parents to not track the tx in setMemPoolChildren
update all ancestors to not include the tx's size/fees in descendant state
update all in-mempool children to not include it as a parent

These happen in UpdateForRemoveFromMempool(). (Note that when removing a transaction along with its descendants, we must calculate that set of transactions to be removed before doing the removal, or else the mempool can be in an inconsistent state where it's impossible to walk the ancestors of a transaction.)

In the event of a reorg, the assumption that a newly added tx has no in-mempool children is false. In particular, the mempool is in an inconsistent state while new transactions are being added, because there may be descendant transactions of a tx coming from a disconnected block that are unreachable from just looking at transactions in the mempool (the linking transactions may also be in the disconnected block, waiting to be added). Because of this, there's not much benefit in trying to search for in-mempool children in addUnchecked(). Instead, in the special case of transactions being added from a disconnected block, we require the caller to clean up the state, to account for in-mempool, out-of-block descendants for all the in-block transactions by calling UpdateTransactionsFromBlock(). Note that until this is called, the mempool state is not consistent, and in particular mapLinks may not be correct (and therefore functions like CalculateMemPoolAncestors() and CalculateDescendants() that rely on them to walk the mempool are not generally safe to use).

Computational limits:

Updating all in-mempool ancestors of a newly added transaction can be slow, if no bound exists on how many in-mempool ancestors there may be. CalculateMemPoolAncestors() takes configurable limits that are designed to prevent these calculations from being too CPU intensive.

Definition at line 443 of file txmempool.h.

Member Typedef Documentation

◆ cacheMap

typedef std::map<txiter, setEntries, CompareIteratorByHash> CTxMemPool::cacheMap

private

Definition at line 535 of file txmempool.h.

◆ indexed_transaction_set

typedef boost::multi_index_container< CTxMemPoolEntry, boost::multi_index::indexed_by< boost::multi_index::hashed_unique<mempoolentry_txid, SaltedTxidHasher>, boost::multi_index::ordered_non_unique< boost::multi_index::tag<descendant_score>, boost::multi_index::identity<CTxMemPoolEntry>, CompareTxMemPoolEntryByDescendantScore >, boost::multi_index::ordered_non_unique< boost::multi_index::tag<entry_time>, boost::multi_index::identity<CTxMemPoolEntry>, CompareTxMemPoolEntryByEntryTime >, boost::multi_index::ordered_non_unique< boost::multi_index::tag<ancestor_score>, boost::multi_index::identity<CTxMemPoolEntry>, CompareTxMemPoolEntryByAncestorFee > > > CTxMemPool::indexed_transaction_set

Definition at line 489 of file txmempool.h.

◆ setEntries

typedef std::set<txiter, CompareIteratorByHash> CTxMemPool::setEntries

Definition at line 529 of file txmempool.h.

◆ txiter

using CTxMemPool::txiter = indexed_transaction_set::nth_index<0>::type::const_iterator

Definition at line 521 of file txmempool.h.

◆ txlinksMap

typedef std::map<txiter, TxLinks, CompareIteratorByHash> CTxMemPool::txlinksMap

private

Definition at line 542 of file txmempool.h.

Constructor & Destructor Documentation

◆ CTxMemPool()

CTxMemPool::CTxMemPool ( CBlockPolicyEstimator * estimator = nullptr )

explicit

Create a new CTxMemPool.

Definition at line 327 of file txmempool.cpp.

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Member Function Documentation

◆ _clear()

void CTxMemPool::_clear ( )

Definition at line 580 of file txmempool.cpp.

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◆ AddTransactionsUpdated()

void CTxMemPool::AddTransactionsUpdated ( unsigned int n )

Definition at line 349 of file txmempool.cpp.

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◆ addUnchecked() [1/2]

void CTxMemPool::addUnchecked	(	const CTxMemPoolEntry &	entry,
		bool	validFeeEstimate = `true`
	)

Definition at line 944 of file txmempool.cpp.

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◆ addUnchecked() [2/2]

void CTxMemPool::addUnchecked	(	const CTxMemPoolEntry &	entry,
		setEntries &	setAncestors,
		bool	validFeeEstimate = `true`
	)

Definition at line 354 of file txmempool.cpp.

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◆ ApplyDelta()

void CTxMemPool::ApplyDelta	(	const uint256	hash,
		CAmount &	nFeeDelta
	)		const

Definition at line 848 of file txmempool.cpp.

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◆ CalculateDescendantMaximum()

uint64_t CTxMemPool::CalculateDescendantMaximum ( txiter entry ) const

Definition at line 1064 of file txmempool.cpp.

◆ CalculateDescendants()

void CTxMemPool::CalculateDescendants	(	txiter	it,
		setEntries &	setDescendants
	)		const

Populate setDescendants with all in-mempool descendants of hash.

Assumes that setDescendants includes all in-mempool descendants of anything already in it.

Definition at line 441 of file txmempool.cpp.

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◆ CalculateMemPoolAncestors()

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

Try to calculate all in-mempool ancestors of entry.

(these are all calculated including the tx itself) limitAncestorCount = max number of ancestors limitAncestorSize = max size of ancestors limitDescendantCount = max number of descendants any ancestor can have limitDescendantSize = max size of descendants any ancestor can have errString = populated with error reason if any limits are hit fSearchForParents = whether to search a tx's vin for in-mempool parents, or look up parents from mapLinks. Must be true for entries not in the mempool

Definition at line 150 of file txmempool.cpp.

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◆ check()

void CTxMemPool::check ( const CCoinsViewCache * pcoins ) const

If sanity-checking is turned on, check makes sure the pool is consistent (does not contain two transactions that spend the same inputs, all inputs are in the mapNextTx array).

If sanity-checking is turned off, check does nothing.

Definition at line 608 of file txmempool.cpp.

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◆ clear()

void CTxMemPool::clear ( )

Definition at line 593 of file txmempool.cpp.

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◆ ClearPrioritisation()

void CTxMemPool::ClearPrioritisation ( const uint256 hash )

Definition at line 858 of file txmempool.cpp.

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◆ CompareDepthAndScore()

bool CTxMemPool::CompareDepthAndScore	(	const uint256 &	hasha,
		const uint256 &	hashb
	)

Definition at line 724 of file txmempool.cpp.

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◆ DynamicMemoryUsage()

size_t CTxMemPool::DynamicMemoryUsage ( ) const

Definition at line 913 of file txmempool.cpp.

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◆ exists()

bool CTxMemPool::exists ( const uint256 & hash ) const

inline

Definition at line 687 of file txmempool.h.

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◆ Expire()

int CTxMemPool::Expire ( std::chrono::seconds time )

Expire all transaction (and their dependencies) in the mempool older than time.

Return the number of removed transactions.

Definition at line 927 of file txmempool.cpp.

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◆ get()

CTransactionRef CTxMemPool::get ( const uint256 & hash ) const

Definition at line 800 of file txmempool.cpp.

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◆ GetConflictTx()

const CTransaction * CTxMemPool::GetConflictTx ( const COutPoint & prevout ) const

Get the transaction in the pool that spends the same prevout.

Definition at line 864 of file txmempool.cpp.

◆ GetIter()

Optional< CTxMemPool::txiter > CTxMemPool::GetIter ( const uint256 & txid ) const

Returns an iterator to the given hash, if found.

Definition at line 870 of file txmempool.cpp.

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◆ GetIterSet()

CTxMemPool::setEntries CTxMemPool::GetIterSet ( const std::set< uint256 > & hashes ) const

Translate a set of hashes into a set of pool iterators to avoid repeated lookups.

Definition at line 877 of file txmempool.cpp.

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◆ GetMemPoolChildren()

const CTxMemPool::setEntries & CTxMemPool::GetMemPoolChildren ( txiter entry ) const

Definition at line 981 of file txmempool.cpp.

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◆ GetMemPoolParents()

const CTxMemPool::setEntries & CTxMemPool::GetMemPoolParents ( txiter entry ) const

Definition at line 973 of file txmempool.cpp.

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◆ GetMinFee()

CFeeRate CTxMemPool::GetMinFee ( size_t sizelimit ) const

The minimum fee to get into the mempool, which may itself not be enough for larger-sized transactions.

The incrementalRelayFee policy variable is used to bound the time it takes the fee rate to go back down all the way to 0. When the feerate would otherwise be half of this, it is set to 0 instead.

Definition at line 989 of file txmempool.cpp.

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◆ GetSortedDepthAndScore()

std::vector< CTxMemPool::indexed_transaction_set::const_iterator > CTxMemPool::GetSortedDepthAndScore ( ) const

private

Definition at line 755 of file txmempool.cpp.

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◆ GetTotalTxSize()

uint64_t CTxMemPool::GetTotalTxSize ( ) const

inline

Definition at line 681 of file txmempool.h.

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◆ GetTransactionAncestry()

void CTxMemPool::GetTransactionAncestry	(	const uint256 &	txid,
		size_t &	ancestors,
		size_t &	descendants
	)		const

Calculate the ancestor and descendant count for the given transaction.

The counts include the transaction itself.

Definition at line 1086 of file txmempool.cpp.

◆ GetTransactionsUpdated()

unsigned int CTxMemPool::GetTransactionsUpdated ( ) const

Definition at line 344 of file txmempool.cpp.

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◆ GUARDED_BY() [1/5]

uint32_t nCheckFrequency CTxMemPool::GUARDED_BY ( cs )

private

Value n means that n times in 2^32 we check.

◆ GUARDED_BY() [2/5]

bool m_is_loaded CTxMemPool::GUARDED_BY ( cs )

inlineprivate

Definition at line 459 of file txmempool.h.

◆ GUARDED_BY() [3/5]

indexed_transaction_set mapTx CTxMemPool::GUARDED_BY ( cs )

◆ GUARDED_BY() [4/5]

std::vector<std::pair<uint256, txiter> > vTxHashes CTxMemPool::GUARDED_BY ( cs )

All tx witness hashes/entries in mapTx, in random order.

◆ GUARDED_BY() [5/5]

indirectmap<COutPoint, const CTransaction*> mapNextTx CTxMemPool::GUARDED_BY ( cs )

◆ HasNoInputsOf()

bool CTxMemPool::HasNoInputsOf ( const CTransaction & tx ) const

Check that none of this transactions inputs are in the mempool, and thus the tx is not dependent on other mempool transactions to be included in a block.

Definition at line 887 of file txmempool.cpp.

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◆ info()

TxMempoolInfo CTxMemPool::info ( const uint256 & hash ) const

Definition at line 809 of file txmempool.cpp.

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◆ infoAll()

std::vector< TxMempoolInfo > CTxMemPool::infoAll ( ) const

Definition at line 786 of file txmempool.cpp.

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◆ IsLoaded()

bool CTxMemPool::IsLoaded ( ) const

Returns: true if the mempool is fully loaded

Definition at line 1096 of file txmempool.cpp.

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◆ isSpent()

bool CTxMemPool::isSpent ( const COutPoint & outpoint ) const

Definition at line 338 of file txmempool.cpp.

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◆ PrioritiseTransaction()

void CTxMemPool::PrioritiseTransaction	(	const uint256 &	hash,
		const CAmount &	nFeeDelta
	)

Affect CreateNewBlock prioritisation of transactions.

Definition at line 818 of file txmempool.cpp.

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◆ queryHashes()

void CTxMemPool::queryHashes ( std::vector< uint256 > & vtxid ) const

Definition at line 769 of file txmempool.cpp.

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◆ removeConflicts()

void CTxMemPool::removeConflicts ( const CTransaction & tx )

Definition at line 531 of file txmempool.cpp.

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◆ removeForBlock()

void CTxMemPool::removeForBlock	(	const std::vector< CTransactionRef > &	vtx,
		unsigned int	nBlockHeight
	)

Called when a block is connected.

Removes from mempool and updates the miner fee estimator.

Definition at line 551 of file txmempool.cpp.

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◆ removeForReorg()

void CTxMemPool::removeForReorg	(	const CCoinsViewCache *	pcoins,
		unsigned int	nMemPoolHeight,
		int	flags
	)

Definition at line 494 of file txmempool.cpp.

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◆ removeRecursive()

void CTxMemPool::removeRecursive	(	const CTransaction &	tx,
		MemPoolRemovalReason	reason
	)

Definition at line 464 of file txmempool.cpp.

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◆ RemoveStaged()

void CTxMemPool::RemoveStaged	(	setEntries &	stage,
		bool	updateDescendants,
		MemPoolRemovalReason	reason
	)

Remove a set of transactions from the mempool.

If a transaction is in this set, then all in-mempool descendants must also be in the set, unless this transaction is being removed for being in a block. Set updateDescendants to true when removing a tx that was in a block, so that any in-mempool descendants have their ancestor state updated.

Definition at line 919 of file txmempool.cpp.

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◆ removeUnchecked()

void CTxMemPool::removeUnchecked	(	txiter	entry,
		MemPoolRemovalReason	reason
	)

private

Before calling removeUnchecked for a given transaction, UpdateForRemoveFromMempool must be called on the entire (dependent) set of transactions being removed at the same time.

We use each CTxMemPoolEntry's setMemPoolParents in order to walk ancestors of a given transaction that is removed, so we can't remove intermediate transactions in a chain before we've updated all the state for the removal.

Definition at line 405 of file txmempool.cpp.

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◆ SetIsLoaded()

void CTxMemPool::SetIsLoaded ( bool loaded )

Sets the current loaded state.

Definition at line 1102 of file txmempool.cpp.

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◆ setSanityCheck()

void CTxMemPool::setSanityCheck ( double dFrequency = 1.0 )

inline

Definition at line 565 of file txmempool.h.

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◆ size()

unsigned long CTxMemPool::size ( ) const

inline

Definition at line 675 of file txmempool.h.

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◆ trackPackageRemoved()

void CTxMemPool::trackPackageRemoved ( const CFeeRate & rate )

private

Definition at line 1013 of file txmempool.cpp.

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◆ TrimToSize()

void CTxMemPool::TrimToSize	(	size_t	sizelimit,
		std::vector< COutPoint > *	pvNoSpendsRemaining = `nullptr`
	)

Remove transactions from the mempool until its dynamic size is <= sizelimit.

pvNoSpendsRemaining, if set, will be populated with the list of outpoints which are not in mempool which no longer have any spends in this mempool.

Definition at line 1021 of file txmempool.cpp.

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◆ UpdateAncestorsOf()

void CTxMemPool::UpdateAncestorsOf	(	bool	add,
		txiter	hash,
		setEntries &	setAncestors
	)

private

Update ancestors of hash to add/remove it as a descendant transaction.

Definition at line 212 of file txmempool.cpp.

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◆ UpdateChild()

void CTxMemPool::UpdateChild	(	txiter	entry,
		txiter	child,
		bool	add
	)

private

Definition at line 953 of file txmempool.cpp.

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◆ UpdateChildrenForRemoval()

void CTxMemPool::UpdateChildrenForRemoval ( txiter entry )

private

Sever link between specified transaction and direct children.

Definition at line 241 of file txmempool.cpp.

◆ UpdateEntryForAncestors()

void CTxMemPool::UpdateEntryForAncestors	(	txiter	it,
		const setEntries &	setAncestors
	)

private

Set ancestor state for an entry.

Definition at line 227 of file txmempool.cpp.

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◆ UpdateForDescendants()

void CTxMemPool::UpdateForDescendants	(	txiter	updateIt,
		cacheMap &	cachedDescendants,
		const std::set< uint256 > &	setExclude
	)

private

UpdateForDescendants is used by UpdateTransactionsFromBlock to update the descendants for a single transaction that has been added to the mempool but may have child transactions in the mempool, eg during a chain reorg.

setExclude is the set of descendant transactions in the mempool that must not be accounted for (because any descendants in setExclude were added to the mempool after the transaction being updated and hence their state is already reflected in the parent state).

cachedDescendants will be updated with the descendants of the transaction being updated, so that future invocations don't need to walk the same transaction again, if encountered in another transaction chain.

Definition at line 60 of file txmempool.cpp.

◆ UpdateForRemoveFromMempool()

void CTxMemPool::UpdateForRemoveFromMempool	(	const setEntries &	entriesToRemove,
		bool	updateDescendants
	)

private

For each transaction being removed, update ancestors and any direct children.

If updateDescendants is true, then also update in-mempool descendants' ancestor state.

Definition at line 249 of file txmempool.cpp.

◆ UpdateParent()

void CTxMemPool::UpdateParent	(	txiter	entry,
		txiter	parent,
		bool	add
	)

private

Definition at line 963 of file txmempool.cpp.

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◆ UpdateTransactionsFromBlock()

void CTxMemPool::UpdateTransactionsFromBlock ( const std::vector< uint256 > & vHashesToUpdate )

When adding transactions from a disconnected block back to the mempool, new mempool entries may have children in the mempool (which is generally not the case when otherwise adding transactions).

UpdateTransactionsFromBlock() will find child transactions and update the descendant state for each transaction in vHashesToUpdate (excluding any child transactions present in vHashesToUpdate, which are already accounted for). Note: vHashesToUpdate should be the set of transactions from the disconnected block that have been accepted back into the mempool.

Definition at line 107 of file txmempool.cpp.

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Member Data Documentation

◆ blockSinceLastRollingFeeBump

bool CTxMemPool::blockSinceLastRollingFeeBump

mutableprivate

Definition at line 454 of file txmempool.h.

◆ cachedInnerUsage

uint64_t CTxMemPool::cachedInnerUsage

private

sum of dynamic memory usage of all the map elements (NOT the maps themselves)

Definition at line 451 of file txmempool.h.

◆ cs

RecursiveMutex CTxMemPool::cs

mutable

This mutex needs to be locked when accessing mapTx or other members that are guarded by it.

Consistency guarantees

By design, it is guaranteed that:

Locking both cs_main and mempool.cs will give a view of mempool that is consistent with current chain tip (ChainActive() and CoinsTip()) and is fully populated. Fully populated means that if the current active chain is missing transactions that were present in a previously active chain, all the missing transactions will have been re-added to the mempool and should be present if they meet size and consistency constraints.
Locking mempool.cs without cs_main will give a view of a mempool consistent with some chain that was active since cs_main was last locked, and that is fully populated as described above. It is ok for code that only needs to query or remove transactions from the mempool to lock just mempool.cs without cs_main.

To provide these guarantees, it is necessary to lock both cs_main and mempool.cs whenever adding transactions to the mempool and whenever changing the chain tip. It's necessary to keep both mutexes locked until the mempool is consistent with the new chain tip and fully populated.

Definition at line 518 of file txmempool.h.

◆ cs_main

void CTxMemPool::cs_main

Definition at line 574 of file txmempool.h.

◆ lastRollingFeeUpdate

int64_t CTxMemPool::lastRollingFeeUpdate

mutableprivate

Definition at line 453 of file txmempool.h.

◆ mapDeltas

std::map<uint256, CAmount> CTxMemPool::mapDeltas

Definition at line 552 of file txmempool.h.

◆ mapLinks

txlinksMap CTxMemPool::mapLinks

private

Definition at line 543 of file txmempool.h.

◆ minerPolicyEstimator

CBlockPolicyEstimator* CTxMemPool::minerPolicyEstimator

private

Definition at line 448 of file txmempool.h.

◆ NotifyEntryAdded

boost::signals2::signal<void (CTransactionRef)> CTxMemPool::NotifyEntryAdded

Definition at line 699 of file txmempool.h.

◆ NotifyEntryRemoved

boost::signals2::signal<void (CTransactionRef, MemPoolRemovalReason)> CTxMemPool::NotifyEntryRemoved

Definition at line 700 of file txmempool.h.

◆ nTransactionsUpdated

std::atomic<unsigned int> CTxMemPool::nTransactionsUpdated

private

Used by getblocktemplate to trigger CreateNewBlock() invocation.

Definition at line 447 of file txmempool.h.

◆ ROLLING_FEE_HALFLIFE

const int CTxMemPool::ROLLING_FEE_HALFLIFE = 60 * 60 * 12

static

Definition at line 463 of file txmempool.h.

◆ rollingMinimumFeeRate

double CTxMemPool::rollingMinimumFeeRate

mutableprivate

minimum fee to get into the pool, decreases exponentially

Definition at line 455 of file txmempool.h.

◆ totalTxSize

uint64_t CTxMemPool::totalTxSize

private

sum of all mempool tx's virtual sizes. Differs from serialized tx size since witness data is discounted. Defined in BIP 141.

Definition at line 450 of file txmempool.h.

The documentation for this class was generated from the following files:

src/txmempool.h
src/txmempool.cpp

Classes

Public Types

Public Member Functions

Public Attributes

Static Public Attributes

Private Types

Private Member Functions

Private Attributes

Detailed Description

Member Typedef Documentation

◆ cacheMap

◆ indexed_transaction_set

◆ setEntries

◆ txiter

◆ txlinksMap

Constructor & Destructor Documentation

◆ CTxMemPool()

Member Function Documentation

◆ _clear()

◆ AddTransactionsUpdated()

◆ addUnchecked() [1/2]

◆ addUnchecked() [2/2]

◆ ApplyDelta()

◆ CalculateDescendantMaximum()

◆ CalculateDescendants()

◆ CalculateMemPoolAncestors()

◆ check()

◆ clear()

◆ ClearPrioritisation()

◆ CompareDepthAndScore()

◆ DynamicMemoryUsage()

◆ exists()

◆ Expire()

◆ get()

◆ GetConflictTx()

◆ GetIter()

◆ GetIterSet()

◆ GetMemPoolChildren()

◆ GetMemPoolParents()

◆ GetMinFee()

◆ GetSortedDepthAndScore()

◆ GetTotalTxSize()

◆ GetTransactionAncestry()

◆ GetTransactionsUpdated()

◆ GUARDED_BY() [1/5]

◆ GUARDED_BY() [2/5]

◆ GUARDED_BY() [3/5]

◆ GUARDED_BY() [4/5]

◆ GUARDED_BY() [5/5]

◆ HasNoInputsOf()

◆ info()

◆ infoAll()

◆ IsLoaded()

◆ isSpent()

◆ PrioritiseTransaction()

◆ queryHashes()

◆ removeConflicts()

◆ removeForBlock()

◆ removeForReorg()

◆ removeRecursive()

◆ RemoveStaged()

◆ removeUnchecked()

◆ SetIsLoaded()

◆ setSanityCheck()

◆ size()

◆ trackPackageRemoved()

◆ TrimToSize()

◆ UpdateAncestorsOf()

◆ UpdateChild()

◆ UpdateChildrenForRemoval()

◆ UpdateEntryForAncestors()

◆ UpdateForDescendants()

◆ UpdateForRemoveFromMempool()

◆ UpdateParent()

◆ UpdateTransactionsFromBlock()

Member Data Documentation

◆ blockSinceLastRollingFeeBump

◆ cachedInnerUsage

◆ cs

◆ cs_main