CCoinsViewMemPool Class Reference

CCoinsView that brings transactions from a mempool into view. More...

#include <txmempool.h>

Inheritance diagram for CCoinsViewMemPool:

Collaboration diagram for CCoinsViewMemPool:

Public Member Functions
	CCoinsViewMemPool (CCoinsView *baseIn, const CTxMemPool &mempoolIn)
bool	GetCoin (const COutPoint &outpoint, Coin &coin) const override
	GetCoin, returning whether it exists and is not spent.
void	PackageAddTransaction (const CTransactionRef &tx)
	Add the coins created by this transaction.
std::unordered_set< COutPoint, SaltedOutpointHasher >	GetNonBaseCoins () const
	Get all coins in m_non_base_coins.
void	Reset ()
	Clear m_temp_added and m_non_base_coins.
Public Member Functions inherited from CCoinsViewBacked
	CCoinsViewBacked (CCoinsView *viewIn)
bool	HaveCoin (const COutPoint &outpoint) const override
	Just check whether a given outpoint is unspent.
BlockHash	GetBestBlock () const override
	Retrieve the block hash whose state this CCoinsView currently represents.
std::vector< BlockHash >	GetHeadBlocks () const override
	Retrieve the range of blocks that may have been only partially written.
void	SetBackend (CCoinsView &viewIn)
bool	BatchWrite (CCoinsMap &mapCoins, const BlockHash &hashBlock, bool erase=true) override
	Do a bulk modification (multiple Coin changes + BestBlock change).
CCoinsViewCursor *	Cursor () const override
	Get a cursor to iterate over the whole state.
size_t	EstimateSize () const override
	Estimate database size (0 if not implemented)
Public Member Functions inherited from CCoinsView
virtual	~CCoinsView ()
	As we use CCoinsViews polymorphically, have a virtual destructor.

Protected Attributes
const CTxMemPool &	mempool
Protected Attributes inherited from CCoinsViewBacked
CCoinsView *	base

Private Attributes
std::unordered_map< COutPoint, Coin, SaltedOutpointHasher >	m_temp_added
	Coins made available by transactions being validated.
std::unordered_set< COutPoint, SaltedOutpointHasher >	m_non_base_coins
	Set of all coins that have been fetched from mempool or created using PackageAddTransaction (not base).

Detailed Description

CCoinsView that brings transactions from a mempool into view.

It does not check for spendings by memory pool transactions. Instead, it provides access to all Coins which are either unspent in the base CCoinsView, are outputs from any mempool transaction, or are tracked temporarily to allow transaction dependencies in package validation. This allows transaction replacement to work as expected, as you want to have all inputs "available" to check signatures, and any cycles in the dependency graph are checked directly in AcceptToMemoryPool. It also allows you to sign a double-spend directly in signrawtransactionwithkey and signrawtransactionwithwallet, as long as the conflicting transaction is not yet confirmed.

Definition at line 618 of file txmempool.h.

Constructor & Destructor Documentation

CCoinsViewMemPool()

CCoinsViewMemPool::CCoinsViewMemPool	(	CCoinsView *	baseIn,
		const CTxMemPool &	mempoolIn
	)

Definition at line 606 of file txmempool.cpp.

Member Function Documentation

GetCoin()

bool CCoinsViewMemPool::GetCoin ( const COutPoint &  outpoint, Coin &  coin  ) const

overridevirtual

GetCoin, returning whether it exists and is not spent.

Also updates m_non_base_coins if the coin is not fetched from base.

Reimplemented from CCoinsViewBacked.

Definition at line 610 of file txmempool.cpp.

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GetNonBaseCoins()

std::unordered_set< COutPoint, SaltedOutpointHasher > CCoinsViewMemPool::GetNonBaseCoins ( ) const

inline

Get all coins in m_non_base_coins.

Definition at line 652 of file txmempool.h.

PackageAddTransaction()

void CCoinsViewMemPool::PackageAddTransaction

(

const CTransactionRef &

tx

)

Add the coins created by this transaction.

These coins are only temporarily stored in m_temp_added and cannot be flushed to the back end. Only used for package validation.

Definition at line 634 of file txmempool.cpp.

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Reset()

void CCoinsViewMemPool::Reset

(

)

Clear m_temp_added and m_non_base_coins.

Definition at line 641 of file txmempool.cpp.

Member Data Documentation

m_non_base_coins

std::unordered_set<COutPoint, SaltedOutpointHasher> CCoinsViewMemPool::m_non_base_coins

mutableprivate

Set of all coins that have been fetched from mempool or created using PackageAddTransaction (not base).

Used to track the origin of a coin, see GetNonBaseCoins().

Definition at line 632 of file txmempool.h.

m_temp_added

std::unordered_map<COutPoint, Coin, SaltedOutpointHasher> CCoinsViewMemPool::m_temp_added

private

Coins made available by transactions being validated.

Tracking these allows for package validation, since we can access transaction outputs without submitting them to mempool.

Definition at line 624 of file txmempool.h.

mempool

const CTxMemPool& CCoinsViewMemPool::mempool

protected

Definition at line 635 of file txmempool.h.

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

• src/txmempool.h
• src/txmempool.cpp