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)
std::optional< Coin >	GetCoin (const COutPoint &outpoint) const override
	GetCoin, returning whether it exists and is not spent.
void	PackageAddTransaction (const CTransactionRef &tx)
	Add the coins created by this transaction.
const 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 *in_view)
void	SetBackend (CCoinsView &in_view)
std::optional< Coin >	PeekCoin (const COutPoint &outpoint) const override
bool	HaveCoin (const COutPoint &outpoint) const override
uint256	GetBestBlock () const override
	Retrieve the block hash whose state this CCoinsView currently represents.
std::vector< uint256 >	GetHeadBlocks () const override
void	BatchWrite (CoinsViewCacheCursor &cursor, const uint256 &block_hash) override
size_t	EstimateSize () const override
	Estimate database size.
Public Member Functions inherited from CCoinsView
virtual	~CCoinsView ()=default
	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 776 of file txmempool.h.

Constructor & Destructor Documentation

CCoinsViewMemPool()

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

Definition at line 788 of file txmempool.cpp.

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Member Function Documentation

GetCoin()

std::optional< Coin > CCoinsViewMemPool::GetCoin ( const COutPoint & outpoint ) 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. May populate the base view on cache misses.

Reimplemented from CCoinsViewBacked.

Definition at line 790 of file txmempool.cpp.

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GetNonBaseCoins()

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

inline

Get all coins in m_non_base_coins.

Definition at line 801 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 813 of file txmempool.cpp.

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Reset()

void CCoinsViewMemPool::Reset

(

)

Clear m_temp_added and m_non_base_coins.

Definition at line 820 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 788 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 782 of file txmempool.h.

mempool

const CTxMemPool& CCoinsViewMemPool::mempool

protected

Definition at line 790 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