Provides an interface for creating and interacting with one or two chainstates: an IBD chainstate generated by downloading blocks, and an optional snapshot chainstate loaded from a UTXO snapshot. More...

#include <validation.h>

Collaboration diagram for ChainstateManager:

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Public Member Functions
bool	ActivateSnapshot (CAutoFile &coins_file, const node::SnapshotMetadata &metadata, bool in_memory)
	Construct and activate a Chainstate on the basis of UTXO snapshot data. More...

CChainState &	ActiveChainstate () const
	The most-work chain. More...

CChain &	ActiveChain () const

int	ActiveHeight () const

CBlockIndex *	ActiveTip () const

node::BlockMap &	BlockIndex () EXCLUSIVE_LOCKS_REQUIRED(

bool	IsSnapshotActive () const

std::optional< uint256 >	SnapshotBlockhash () const

bool	IsSnapshotValidated () const
	Is there a snapshot in use and has it been fully validated? More...

bool	ProcessNewBlock (const CChainParams &chainparams, const std::shared_ptr< const CBlock > &block, bool force_processing, bool *new_block) LOCKS_EXCLUDED(cs_main)
	Process an incoming block. More...

bool	ProcessNewBlockHeaders (const std::vector< CBlockHeader > &block, BlockValidationState &state, const CChainParams &chainparams, const CBlockIndex **ppindex=nullptr) LOCKS_EXCLUDED(cs_main)
	Process incoming block headers. More...

MempoolAcceptResult	ProcessTransaction (const CTransactionRef &tx, bool test_accept=false) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
	Try to add a transaction to the memory pool. More...

bool	LoadBlockIndex () EXCLUSIVE_LOCKS_REQUIRED(cs_main)
	Load the block tree and coins database from disk, initializing state if we're running with -reindex. More...

void MaybeRebalanceCaches() EXCLUSIVE_LOCKS_REQUIRED(	~ChainstateManager ()
	Check to see if caches are out of balance and if so, call ResizeCoinsCaches() as needed. More...

Public Attributes
std::thread	m_load_block

node::BlockManager	m_blockman
	A single BlockManager instance is shared across each constructed chainstate to avoid duplicating block metadata. More...

std::set< CBlockIndex * >	m_failed_blocks
	In order to efficiently track invalidity of headers, we keep the set of blocks which we tried to connect and found to be invalid here (ie which were set to BLOCK_FAILED_VALID since the last restart). More...

int64_t	m_total_coinstip_cache {0}
	The total number of bytes available for us to use across all in-memory coins caches. More...

int64_t	m_total_coinsdb_cache {0}
	The total number of bytes available for us to use across all leveldb coins databases. More...

CChainState &InitializeChainstate(CTxMemPool mempool, const std::optional< uint256 > &snapshot_blockhash=std::nullopt) LIFETIMEBOUND EXCLUSIVE_LOCKS_REQUIRED(std::vector< CChainState	GetAll )()
	Instantiate a new chainstate and assign it based upon whether it is from a snapshot. More...

Private Member Functions
std::unique_ptr< CChainState > m_ibd_chainstate	GUARDED_BY (::cs_main)
	The chainstate used under normal operation (i.e. More...

std::unique_ptr< CChainState > m_snapshot_chainstate	GUARDED_BY (::cs_main)
	A chainstate initialized on the basis of a UTXO snapshot. More...

CChainState *m_active_chainstate	GUARDED_BY (::cs_main)
	Points to either the ibd or snapshot chainstate; indicates our most-work chain. More...

bool	PopulateAndValidateSnapshot (CChainState &snapshot_chainstate, CAutoFile &coins_file, const node::SnapshotMetadata &metadata)
	Internal helper for ActivateSnapshot(). More...

bool	AcceptBlockHeader (const CBlockHeader &block, BlockValidationState &state, const CChainParams &chainparams, CBlockIndex **ppindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main)
	If a block header hasn't already been seen, call CheckBlockHeader on it, ensure that it doesn't descend from an invalid block, and then add it to m_block_index. More...

Private Attributes
bool	m_snapshot_validated {false}
	If true, the assumed-valid chainstate has been fully validated by the background validation chainstate. More...

CBlockIndex *	m_best_invalid

friend	CChainState

Friends
bool	node::BlockManager::LoadBlockIndex (const Consensus::Params &, ChainstateManager &)

Detailed Description

Provides an interface for creating and interacting with one or two chainstates: an IBD chainstate generated by downloading blocks, and an optional snapshot chainstate loaded from a UTXO snapshot.

Managed chainstates can be maintained at different heights simultaneously.

This class provides abstractions that allow the retrieval of the current most-work chainstate ("Active") as well as chainstates which may be in background use to validate UTXO snapshots.

Definitions:

IBD chainstate: a chainstate whose current state has been "fully" validated by the initial block download process.

Snapshot chainstate: a chainstate populated by loading in an assumeutxo UTXO snapshot.

Active chainstate: the chainstate containing the current most-work chain. Consulted by most parts of the system (net_processing, wallet) as a reflection of the current chain and UTXO set. This may either be an IBD chainstate or a snapshot chainstate.

Background IBD chainstate: an IBD chainstate for which the IBD process is happening in the background while use of the active (snapshot) chainstate allows the rest of the system to function.

Definition at line 792 of file validation.h.

Constructor & Destructor Documentation

◆ ~ChainstateManager()

void MaybeRebalanceCaches () EXCLUSIVE_LOCKS_REQUIRED( ChainstateManager::~ChainstateManager ( )

inline

Check to see if caches are out of balance and if so, call ResizeCoinsCaches() as needed.

Definition at line 1001 of file validation.h.

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Member Function Documentation

◆ AcceptBlockHeader()

bool ChainstateManager::AcceptBlockHeader	(	const CBlockHeader &	block,
		BlockValidationState &	state,
		const CChainParams &	chainparams,
		CBlockIndex **	ppindex
	)

private

If a block header hasn't already been seen, call CheckBlockHeader on it, ensure that it doesn't descend from an invalid block, and then add it to m_block_index.

Definition at line 3492 of file validation.cpp.

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◆ ActivateSnapshot()

bool ChainstateManager::ActivateSnapshot	(	CAutoFile &	coins_file,
		const node::SnapshotMetadata &	metadata,
		bool	in_memory
	)

Construct and activate a Chainstate on the basis of UTXO snapshot data.

Steps:

Initialize an unused CChainState.
Load its CoinsViews contents from coins_file.
Verify that the hash of the resulting coinsdb matches the expected hash per assumeutxo chain parameters.
Wait for our headers chain to include the base block of the snapshot.
"Fast forward" the tip of the new chainstate to the base of the snapshot, faking nTx* block index data along the way.
Move the new chainstate to m_snapshot_chainstate and make it our ChainstateActive().

Definition at line 4735 of file validation.cpp.

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◆ ActiveChain()

CChain& ChainstateManager::ActiveChain ( ) const

inline

Definition at line 926 of file validation.h.

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◆ ActiveChainstate()

CChainState & ChainstateManager::ActiveChainstate ( ) const

The most-work chain.

Definition at line 5025 of file validation.cpp.

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◆ ActiveHeight()

int ChainstateManager::ActiveHeight ( ) const

inline

Definition at line 927 of file validation.h.

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◆ ActiveTip()

CBlockIndex* ChainstateManager::ActiveTip ( ) const

inline

Definition at line 928 of file validation.h.

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◆ BlockIndex()

node::BlockMap& ChainstateManager::BlockIndex ( )

inline

Definition at line 930 of file validation.h.

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◆ GUARDED_BY() [1/3]

std::unique_ptr<CChainState> m_ibd_chainstate ChainstateManager::GUARDED_BY ( ::cs_main )

private

The chainstate used under normal operation (i.e.

"regular" IBD) or, if a snapshot is in use, for background validation.

Its contents (including on-disk data) will be deleted upon shutdown after background validation of the snapshot has completed. We do not free the chainstate contents immediately after it finishes validation to cautiously avoid a case where some other part of the system is still using this pointer (e.g. net_processing).

Once this pointer is set to a corresponding chainstate, it will not be reset until init.cpp:Shutdown().

This is especially important when, e.g., calling ActivateBestChain() on all chainstates because we are not able to hold cs_main going into that call.

◆ GUARDED_BY() [2/3]

std::unique_ptr<CChainState> m_snapshot_chainstate ChainstateManager::GUARDED_BY ( ::cs_main )

private

A chainstate initialized on the basis of a UTXO snapshot.

If this is non-null, it is always our active chainstate.

Once this pointer is set to a corresponding chainstate, it will not be reset until init.cpp:Shutdown().

This is especially important when, e.g., calling ActivateBestChain() on all chainstates because we are not able to hold cs_main going into that call.

◆ GUARDED_BY() [3/3]

CChainState* m_active_chainstate ChainstateManager::GUARDED_BY ( ::cs_main )

inlineprivate

Points to either the ibd or snapshot chainstate; indicates our most-work chain.

Once this pointer is set to a corresponding chainstate, it will not be reset until init.cpp:Shutdown().

This is especially important when, e.g., calling ActivateBestChain() on all chainstates because we are not able to hold cs_main going into that call.

Definition at line 832 of file validation.h.

◆ IsSnapshotActive()

bool ChainstateManager::IsSnapshotActive ( ) const

Returns: true if a snapshot-based chainstate is in use. Also implies that a background validation chainstate is also in use.

Definition at line 5032 of file validation.cpp.

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◆ IsSnapshotValidated()

bool ChainstateManager::IsSnapshotValidated ( ) const

inline

Is there a snapshot in use and has it been fully validated?

Definition at line 943 of file validation.h.

◆ LoadBlockIndex()

bool ChainstateManager::LoadBlockIndex ( )

Load the block tree and coins database from disk, initializing state if we're running with -reindex.

Definition at line 4076 of file validation.cpp.

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◆ PopulateAndValidateSnapshot()

bool ChainstateManager::PopulateAndValidateSnapshot	(	CChainState &	snapshot_chainstate,
		CAutoFile &	coins_file,
		const node::SnapshotMetadata &	metadata
	)

private

Internal helper for ActivateSnapshot().

Definition at line 4829 of file validation.cpp.

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◆ ProcessNewBlock()

bool ChainstateManager::ProcessNewBlock	(	const CChainParams &	chainparams,
		const std::shared_ptr< const CBlock > &	block,
		bool	force_processing,
		bool *	new_block
	)

Process an incoming block.

This only returns after the best known valid block is made active. Note that it does not, however, guarantee that the specific block passed to it has been checked for validity!

If you want to possibly get feedback on whether block is valid, you must install a CValidationInterface (see validationinterface.h) - this will have its BlockChecked method called whenever any block completes validation.

Note that we guarantee that either the proof-of-work is valid on block, or (and possibly also) BlockChecked will have been called.

May not be called in a validationinterface callback.

Parameters

[in]	block	The block we want to process.
[in]	force_processing	Process this block even if unrequested; used for non-network block sources.
[out]	new_block	A boolean which is set to indicate if the block was first received via this call

Returns: If the block was processed, independently of block validity

Definition at line 3694 of file validation.cpp.

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◆ ProcessNewBlockHeaders()

bool ChainstateManager::ProcessNewBlockHeaders	(	const std::vector< CBlockHeader > &	block,
		BlockValidationState &	state,
		const CChainParams &	chainparams,
		const CBlockIndex **	ppindex = `nullptr`
	)

Process incoming block headers.

May not be called in a validationinterface callback.

Parameters

[in]	block	The block headers themselves
[out]	state	This may be set to an Error state if any error occurred processing them
[in]	chainparams	The params for the chain we want to connect to
[out]	ppindex	If set, the pointer will be set to point to the last new block index object for the given headers

Definition at line 3581 of file validation.cpp.

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◆ ProcessTransaction()

MempoolAcceptResult ChainstateManager::ProcessTransaction	(	const CTransactionRef &	tx,
		bool	test_accept = `false`
	)

Try to add a transaction to the memory pool.

Parameters

[in]	tx	The transaction to submit for mempool acceptance.
[in]	test_accept	When true, run validation checks but don't submit to mempool.

Definition at line 3733 of file validation.cpp.

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◆ SnapshotBlockhash()

std::optional< uint256 > ChainstateManager::SnapshotBlockhash ( ) const

Definition at line 4673 of file validation.cpp.

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Friends And Related Function Documentation

◆ node::BlockManager::LoadBlockIndex

bool node::BlockManager::LoadBlockIndex	(	const Consensus::Params &	,
		ChainstateManager &
	)

friend

Member Data Documentation

◆ CChainState

friend ChainstateManager::CChainState

private

Definition at line 856 of file validation.h.

◆ GetAll

std::vector< CChainState * > ChainstateManager::GetAll

Instantiate a new chainstate and assign it based upon whether it is from a snapshot.

Parameters

[in]	mempool	The mempool to pass to the chainstate
[in]	snapshot_blockhash	If given, signify that this chainstate is based on a snapshot. Get all chainstates currently being used.

Definition at line 906 of file validation.h.

◆ m_best_invalid

CBlockIndex* ChainstateManager::m_best_invalid

private

Definition at line 838 of file validation.h.

◆ m_blockman

node::BlockManager ChainstateManager::m_blockman

A single BlockManager instance is shared across each constructed chainstate to avoid duplicating block metadata.

Definition at line 862 of file validation.h.

◆ m_failed_blocks

std::set<CBlockIndex*> ChainstateManager::m_failed_blocks

In order to efficiently track invalidity of headers, we keep the set of blocks which we tried to connect and found to be invalid here (ie which were set to BLOCK_FAILED_VALID since the last restart).

We can then walk this set and check if a new header is a descendant of something in this set, preventing us from having to walk m_block_index when we try to connect a bad block and fail.

While this is more complicated than marking everything which descends from an invalid block as invalid at the time we discover it to be invalid, doing so would require walking all of m_block_index to find all descendants. Since this case should be very rare, keeping track of all BLOCK_FAILED_VALID blocks in a set should be just fine and work just as well.

Because we already walk m_block_index in height-order at startup, we go ahead and mark descendants of invalid blocks as FAILED_CHILD at that time, instead of putting things in this set.

Definition at line 883 of file validation.h.

◆ m_load_block

std::thread ChainstateManager::m_load_block

Definition at line 859 of file validation.h.

◆ m_snapshot_validated

bool ChainstateManager::m_snapshot_validated {false}

private

If true, the assumed-valid chainstate has been fully validated by the background validation chainstate.

Definition at line 836 of file validation.h.

◆ m_total_coinsdb_cache

int64_t ChainstateManager::m_total_coinsdb_cache {0}

The total number of bytes available for us to use across all leveldb coins databases.

This will be split somehow across chainstates.

Definition at line 891 of file validation.h.

◆ m_total_coinstip_cache

int64_t ChainstateManager::m_total_coinstip_cache {0}

The total number of bytes available for us to use across all in-memory coins caches.

This will be split somehow across chainstates.

Definition at line 887 of file validation.h.

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

src/validation.h
src/validation.cpp

Public Member Functions

Public Attributes

Private Member Functions

Private Attributes

Friends

Detailed Description

Constructor & Destructor Documentation

◆ ~ChainstateManager()

Member Function Documentation

◆ AcceptBlockHeader()

◆ ActivateSnapshot()

◆ ActiveChain()

◆ ActiveChainstate()

◆ ActiveHeight()

◆ ActiveTip()

◆ BlockIndex()

◆ GUARDED_BY() [1/3]

◆ GUARDED_BY() [2/3]

◆ GUARDED_BY() [3/3]

◆ IsSnapshotActive()

◆ IsSnapshotValidated()

◆ LoadBlockIndex()

◆ PopulateAndValidateSnapshot()

◆ ProcessNewBlock()

◆ ProcessNewBlockHeaders()

◆ ProcessTransaction()

◆ SnapshotBlockhash()

Friends And Related Function Documentation

◆ node::BlockManager::LoadBlockIndex

Member Data Documentation

◆ CChainState

◆ GetAll

◆ m_best_invalid

◆ m_blockman

◆ m_failed_blocks

◆ m_load_block

◆ m_snapshot_validated

◆ m_total_coinsdb_cache

◆ m_total_coinstip_cache