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 index can efficiently determine the point it last stopped at. More...

Public Member Functions
	BaseIndex (std::unique_ptr< interfaces::Chain > chain, std::string name)

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

const std::string &	GetName () const LIFETIMEBOUND
	Get the name of the index for display in logs. More...

bool	Init ()
	Initializes the sync state and registers the instance to the validation interface so that it stays in sync with blockchain updates. More...

bool	StartBackgroundSync ()
	Starts the initial sync process. More...

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

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

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

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

virtual bool	CustomInit (const std::optional< interfaces::BlockKey > &block)
	Initialize internal state from the database and block index. More...

virtual bool	CustomAppend (const interfaces::BlockInfo &block)
	Write update index entries for a newly connected block. More...

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

virtual bool	CustomRewind (const interfaces::BlockKey &current_tip, const interfaces::BlockKey &new_tip)
	Rewind index to an earlier chain tip during a chain reorg. More...

virtual DB &	GetDB () const =0

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

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

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

virtual void	TransactionAddedToMempool (const CTransactionRef &tx, uint64_t mempool_sequence)
	Notifies listeners of a transaction having been added to mempool. More...

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

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

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

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. More...

Protected Attributes
std::unique_ptr< interfaces::Chain >	m_chain

Chainstate *	m_chainstate {nullptr}

const std::string	m_name

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

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

bool	Rewind (const CBlockIndex current_tip, const CBlockIndex new_tip)
	Loop over disconnected blocks and call CustomRewind. More...

virtual bool	AllowPrune () const =0

template<typename... Args>
void	FatalErrorf (const char *fmt, const Args &... args)

Private Attributes
std::atomic< bool >	m_init {false}
	Whether the index has been initialized or not. More...

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

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

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.

In the presence of multiple chainstates (i.e. if a UTXO snapshot is loaded), only the background "IBD" chainstate will be indexed to avoid building the index out of order. When the background chainstate completes validation, the index will be reinitialized and indexing will continue.

Definition at line 40 of file base.h.

Constructor & Destructor Documentation

◆ BaseIndex()

BaseIndex::BaseIndex	(	std::unique_ptr< interfaces::Chain >	chain,
		std::string	name
	)

Definition at line 71 of file base.cpp.

◆ ~BaseIndex()

BaseIndex::~BaseIndex ( )

virtual

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

Definition at line 74 of file base.cpp.

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Member Function Documentation

◆ AllowPrune()

virtual bool BaseIndex::AllowPrune ( ) const

privatepure virtual

Implemented in TxIndex, CoinStatsIndex, and BlockFilterIndex.

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◆ BlockConnected()

void BaseIndex::BlockConnected	(	ChainstateRole	role,
		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 262 of file base.cpp.

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◆ ChainStateFlushed()

void BaseIndex::ChainStateFlushed	(	ChainstateRole	role,
		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 319 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 219 of file base.cpp.

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◆ CustomAppend()

virtual bool BaseIndex::CustomAppend ( const interfaces::BlockInfo & block )

inlineprotectedvirtual

Write update index entries for a newly connected block.

Reimplemented in TxIndex, CoinStatsIndex, and BlockFilterIndex.

Definition at line 119 of file base.h.

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◆ CustomCommit()

virtual bool BaseIndex::CustomCommit ( CDBBatch & batch )

inlineprotectedvirtual

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

Reimplemented in CoinStatsIndex, and BlockFilterIndex.

Definition at line 123 of file base.h.

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◆ CustomInit()

virtual bool BaseIndex::CustomInit ( const std::optional< interfaces::BlockKey > & block )

inlineprotectedvirtual

Initialize internal state from the database and block index.

Reimplemented in CoinStatsIndex, and BlockFilterIndex.

Definition at line 116 of file base.h.

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◆ CustomRewind()

virtual bool BaseIndex::CustomRewind	(	const interfaces::BlockKey &	current_tip,
		const interfaces::BlockKey &	new_tip
	)

inlineprotectedvirtual

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

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

Reimplemented in CoinStatsIndex, and BlockFilterIndex.

Definition at line 127 of file base.h.

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◆ FatalErrorf()

template<typename... Args>

void BaseIndex::FatalErrorf	(	const char *	fmt,
		const Args &...	args
	)

private

Definition at line 32 of file base.cpp.

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◆ GetDB()

virtual DB& BaseIndex::GetDB ( ) const

protectedpure virtual

Implemented in TxIndex, CoinStatsIndex, and BlockFilterIndex.

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◆ GetName()

const std::string& BaseIndex::GetName ( ) const

inline

Get the name of the index for display in logs.

Definition at line 140 of file base.h.

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◆ GetSummary()

IndexSummary BaseIndex::GetSummary ( ) const

Get a summary of the index and its state.

Definition at line 410 of file base.cpp.

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◆ Init()

bool BaseIndex::Init ( )

Initializes the sync state and registers the instance to the validation interface so that it stays in sync with blockchain updates.

Definition at line 80 of file base.cpp.

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◆ Rewind()

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

private

Loop over disconnected blocks and call CustomRewind.

Definition at line 238 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 425 of file base.cpp.

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◆ StartBackgroundSync()

bool BaseIndex::StartBackgroundSync ( )

Starts the initial sync process.

Definition at line 393 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 401 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 145 of file base.cpp.

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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 76 of file base.h.

◆ m_chain

std::unique_ptr<interfaces::Chain> BaseIndex::m_chain

protected

Definition at line 107 of file base.h.

◆ m_chainstate

Chainstate* BaseIndex::m_chainstate {nullptr}

protected

Definition at line 108 of file base.h.

◆ m_init

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

private

Whether the index has been initialized or not.

Definition at line 65 of file base.h.

◆ m_interrupt

CThreadInterrupt BaseIndex::m_interrupt

private

Definition at line 79 of file base.h.

◆ m_name

const std::string BaseIndex::m_name

protected

Definition at line 109 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.

Note that this will latch to true immediately upon startup if m_chainstate->m_chain is empty, which will be the case upon startup with an empty datadir if, e.g., -txindex=1 is specified.

Definition at line 73 of file base.h.

◆ m_thread_sync

std::thread BaseIndex::m_thread_sync

private

Definition at line 78 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()

◆ ~BaseIndex()

Member Function Documentation

◆ AllowPrune()

◆ BlockConnected()

◆ ChainStateFlushed()

◆ Commit()

◆ CustomAppend()

◆ CustomCommit()

◆ CustomInit()

◆ CustomRewind()

◆ FatalErrorf()

◆ GetDB()

◆ GetName()

◆ GetSummary()

◆ Init()

◆ Rewind()

◆ SetBestBlockIndex()

◆ StartBackgroundSync()

◆ Stop()

◆ ThreadSync()

Member Data Documentation

◆ m_best_block_index

◆ m_chain

◆ m_chainstate

◆ m_init

◆ m_interrupt

◆ m_name

◆ m_synced

◆ m_thread_sync