Base class for indices of blockchain data. More...

#include <base.h>

Inheritance diagram for BaseIndex:

Collaboration diagram for BaseIndex:

Classes
class	DB
	The database stores a block locator of the chain the database is synced to so that the TxIndex can efficiently determine the point it last stopped at. More...

Public Member Functions
virtual	~BaseIndex ()
	Destructor interrupts sync thread if running and blocks until it exits.

bool BlockUntilSyncedToCurrentChain() const LOCKS_EXCLUDED(void	Interrupt ()
	Blocks the current thread until the index is caught up to the current state of the block chain.

bool	Start (Chainstate &active_chainstate)
	Start initializes the sync state and registers the instance as a ValidationInterface so that it stays in sync with blockchain updates.

void	Stop ()
	Stops the instance from staying in sync with blockchain updates.

IndexSummary	GetSummary () const
	Get a summary of the index and its state.

Protected Member Functions
void	BlockConnected (const std::shared_ptr< const CBlock > &block, const CBlockIndex *pindex) override
	Notifies listeners of a block being connected.

void	ChainStateFlushed (const CBlockLocator &locator) override
	Notifies listeners of the new active block chain on-disk.

const CBlockIndex *	CurrentIndex ()

virtual bool	Init ()
	Initialize internal state from the database and block index.

virtual bool	WriteBlock (const CBlock &block, const CBlockIndex *pindex)
	Write update index entries for a newly connected block.

virtual bool	CommitInternal (CDBBatch &batch)
	Virtual method called internally by Commit that can be overridden to atomically commit more index state.

virtual bool	Rewind (const CBlockIndex current_tip, const CBlockIndex new_tip)
	Rewind index to an earlier chain tip during a chain reorg.

virtual DB &	GetDB () const =0

virtual const char *	GetName () const =0
	Get the name of the index for display in logs.

void	SetBestBlockIndex (const CBlockIndex *block)
	Update the internal best block index as well as the prune lock.

Protected Member Functions inherited from CValidationInterface
	~CValidationInterface ()=default
	Protected destructor so that instances can only be deleted by derived classes.

virtual void	UpdatedBlockTip (const CBlockIndex pindexNew, const CBlockIndex pindexFork, bool fInitialDownload)
	Notifies listeners when the block chain tip advances.

virtual void	TransactionAddedToMempool (const CTransactionRef &tx, std::shared_ptr< const std::vector< Coin > > spent_coins, uint64_t mempool_sequence)
	Notifies listeners of a transaction having been added to mempool.

virtual void	TransactionRemovedFromMempool (const CTransactionRef &tx, MemPoolRemovalReason reason, uint64_t mempool_sequence)
	Notifies listeners of a transaction leaving mempool.

virtual void	BlockDisconnected (const std::shared_ptr< const CBlock > &block, const CBlockIndex *pindex)
	Notifies listeners of a block being disconnected.

virtual void	BlockChecked (const CBlock &, const BlockValidationState &)
	Notifies listeners of a block validation result.

virtual void	NewPoWValidBlock (const CBlockIndex *pindex, const std::shared_ptr< const CBlock > &block)
	Notifies listeners that a block which builds directly on our current tip has been received and connected to the headers tree, though not validated yet.

virtual void	BlockFinalized (const CBlockIndex *pindex)

virtual void	BlockInvalidated (const CBlockIndex *pindex, const std::shared_ptr< const CBlock > &block)

Protected Attributes
Chainstate *	m_chainstate {nullptr}

Private Member Functions
void	ThreadSync ()
	Sync the index with the block index starting from the current best block.

bool	Commit ()
	Write the current index state (eg.

virtual bool	AllowPrune () const =0

Private Attributes
std::atomic< bool >	m_synced {false}
	Whether the index is in sync with the main chain.

std::atomic< const CBlockIndex * >	m_best_block_index {nullptr}
	The last block in the chain that the index is in sync with.

std::thread	m_thread_sync

CThreadInterrupt	m_interrupt

Detailed Description

Base class for indices of blockchain data.

This implements CValidationInterface and ensures blocks are indexed sequentially according to their position in the active chain.

Definition at line 27 of file base.h.

Constructor & Destructor Documentation

◆ ~BaseIndex()

BaseIndex::~BaseIndex ( )

virtual

Destructor interrupts sync thread if running and blocks until it exits.

Definition at line 63 of file base.cpp.

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Member Function Documentation

◆ AllowPrune()

virtual bool BaseIndex::AllowPrune ( ) const

privatepure virtual

Implemented in BlockFilterIndex, CoinStatsIndex, and TxIndex.

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◆ BlockConnected()

void BaseIndex::BlockConnected	(	const std::shared_ptr< const CBlock > &	block,
		const CBlockIndex *	pindex
	)

overrideprotectedvirtual

Notifies listeners of a block being connected.

Provides a vector of transactions evicted from the mempool as a result.

Called on a background thread.

Reimplemented from CValidationInterface.

Definition at line 257 of file base.cpp.

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◆ ChainStateFlushed()

void BaseIndex::ChainStateFlushed ( const CBlockLocator & locator )

overrideprotectedvirtual

Notifies listeners of the new active block chain on-disk.

Prior to this callback, any updates are not guaranteed to persist on disk (ie clients need to handle shutdown/restart safety by being able to understand when some updates were lost due to unclean shutdown).

When this callback is invoked, the validation changes done by any prior callback are guaranteed to exist on disk and survive a restart, including an unclean shutdown.

Provides a locator describing the best chain, which is likely useful for storing current state on disk in client DBs.

Called on a background thread.

Reimplemented from CValidationInterface.

Definition at line 308 of file base.cpp.

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◆ Commit()

bool BaseIndex::Commit ( )

private

Write the current index state (eg.

chain block locator and subclass-specific items) to disk.

Recommendations for error handling: If called on a successor of the previous committed best block in the index, the index can continue processing without risk of corruption, though the index state will need to catch up from further behind on reboot. If the new state is not a successor of the previous state (due to a chain reorganization), the index must halt until Commit succeeds or else it could end up getting corrupted.

Definition at line 217 of file base.cpp.

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◆ CommitInternal()

bool BaseIndex::CommitInternal ( CDBBatch & batch )

protectedvirtual

Virtual method called internally by Commit that can be overridden to atomically commit more index state.

Reimplemented in BlockFilterIndex, and CoinStatsIndex.

Definition at line 226 of file base.cpp.

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◆ CurrentIndex()

const CBlockIndex * BaseIndex::CurrentIndex ( )

inlineprotected

Definition at line 89 of file base.h.

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◆ GetDB()

virtual DB & BaseIndex::GetDB ( ) const

protectedpure virtual

Implemented in BlockFilterIndex, CoinStatsIndex, and TxIndex.

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◆ GetName()

virtual const char * BaseIndex::GetName ( ) const

protectedpure virtual

Get the name of the index for display in logs.

Implemented in BlockFilterIndex, CoinStatsIndex, and TxIndex.

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◆ GetSummary()

IndexSummary BaseIndex::GetSummary ( ) const

Get a summary of the index and its state.

Definition at line 400 of file base.cpp.

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◆ Init()

bool BaseIndex::Init ( )

protectedvirtual

Initialize internal state from the database and block index.

Reimplemented in BlockFilterIndex, and CoinStatsIndex.

Definition at line 68 of file base.cpp.

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◆ Interrupt()

void BaseIndex::Interrupt ( )

Blocks the current thread until the index is caught up to the current state of the block chain.

This only blocks if the index has gotten in sync once and only needs to process blocks in the ValidationInterface queue. If the index is catching up from far behind, this method does not block and immediately returns false.

Definition at line 374 of file base.cpp.

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◆ Rewind()

bool BaseIndex::Rewind	(	const CBlockIndex *	current_tip,
		const CBlockIndex *	new_tip
	)

protectedvirtual

Rewind index to an earlier chain tip during a chain reorg.

The tip must be an ancestor of the current best block.

Reimplemented in BlockFilterIndex, and CoinStatsIndex.

Definition at line 237 of file base.cpp.

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◆ SetBestBlockIndex()

void BaseIndex::SetBestBlockIndex ( const CBlockIndex * block )

protected

Update the internal best block index as well as the prune lock.

Definition at line 409 of file base.cpp.

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◆ Start()

bool BaseIndex::Start ( Chainstate & active_chainstate )

Start initializes the sync state and registers the instance as a ValidationInterface so that it stays in sync with blockchain updates.

Definition at line 378 of file base.cpp.

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◆ Stop()

void BaseIndex::Stop ( )

Stops the instance from staying in sync with blockchain updates.

Definition at line 392 of file base.cpp.

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◆ ThreadSync()

void BaseIndex::ThreadSync ( )

private

Sync the index with the block index starting from the current best block.

Intended to be run in its own thread, m_thread_sync, and can be interrupted with m_interrupt. Once the index gets in sync, the m_synced flag is set and the BlockConnected ValidationInterface callback takes over and the sync thread exits.

Definition at line 144 of file base.cpp.

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◆ WriteBlock()

virtual bool BaseIndex::WriteBlock	(	const CBlock &	block,
		const CBlockIndex *	pindex
	)

inlineprotectedvirtual

Write update index entries for a newly connected block.

Reimplemented in BlockFilterIndex, CoinStatsIndex, and TxIndex.

Definition at line 95 of file base.h.

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Member Data Documentation

◆ m_best_block_index

std::atomic<const CBlockIndex *> BaseIndex::m_best_block_index {nullptr}

private

The last block in the chain that the index is in sync with.

Definition at line 55 of file base.h.

◆ m_chainstate

Chainstate* BaseIndex::m_chainstate {nullptr}

protected

Definition at line 82 of file base.h.

◆ m_interrupt

CThreadInterrupt BaseIndex::m_interrupt

private

Definition at line 58 of file base.h.

◆ m_synced

std::atomic<bool> BaseIndex::m_synced {false}

private

Whether the index is in sync with the main chain.

The flag is flipped from false to true once, after which point this starts processing ValidationInterface notifications to stay in sync.

Definition at line 52 of file base.h.

◆ m_thread_sync

std::thread BaseIndex::m_thread_sync

private

Definition at line 57 of file base.h.

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

src/index/base.h
src/index/base.cpp

Classes

Public Member Functions

Protected Member Functions

Protected Attributes

Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ ~BaseIndex()

Member Function Documentation

◆ AllowPrune()

◆ BlockConnected()

◆ ChainStateFlushed()

◆ Commit()

◆ CommitInternal()

◆ CurrentIndex()

◆ GetDB()

◆ GetName()

◆ GetSummary()

◆ Init()

◆ Interrupt()

◆ Rewind()

◆ SetBestBlockIndex()

◆ Start()

◆ Stop()

◆ ThreadSync()

◆ WriteBlock()

Member Data Documentation

◆ m_best_block_index

◆ m_chainstate

◆ m_interrupt

◆ m_synced

◆ m_thread_sync