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
	Retrieve the Coin (unspent transaction output) for a given outpoint. More...
void	PackageAddTransaction (const CTransactionRef &tx)
	Add the coins created by this transaction. More...
Public Member Functions inherited from CCoinsViewBacked
	CCoinsViewBacked (CCoinsView *viewIn)
bool	HaveCoin (const COutPoint &outpoint) const override
	Just check whether a given outpoint is unspent. More...
BlockHash	GetBestBlock () const override
	Retrieve the block hash whose state this CCoinsView currently represents. More...
std::vector< BlockHash >	GetHeadBlocks () const override
	Retrieve the range of blocks that may have been only partially written. More...
void	SetBackend (CCoinsView &viewIn)
bool	BatchWrite (CCoinsMap &mapCoins, const BlockHash &hashBlock) override
	Do a bulk modification (multiple Coin changes + BestBlock change). More...
CCoinsViewCursor *	Cursor () const override
	Get a cursor to iterate over the whole state. More...
size_t	EstimateSize () const override
	Estimate database size (0 if not implemented) More...
Public Member Functions inherited from CCoinsView
virtual	~CCoinsView ()
	As we use CCoinsViews polymorphically, have a virtual destructor. More...

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. More...

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 589 of file txmempool.h.

Constructor & Destructor Documentation

CCoinsViewMemPool()

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

Definition at line 588 of file txmempool.cpp.

Member Function Documentation

GetCoin()

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

overridevirtual

Retrieve the Coin (unspent transaction output) for a given outpoint.

Returns true only when an unspent coin was found, which is returned in coin. When false is returned, coin's value is unspecified.

Reimplemented from CCoinsViewBacked.

Definition at line 592 of file txmempool.cpp.

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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 615 of file txmempool.cpp.

Member Data Documentation

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 595 of file txmempool.h.

mempool

const CTxMemPool& CCoinsViewMemPool::mempool

protected

Definition at line 598 of file txmempool.h.

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

• /work/src/txmempool.h
• /work/src/txmempool.cpp