chain.h File Reference

#include <arith_uint256.h>
#include <primitives/block.h>
#include <pow.h>
#include <tinyformat.h>
#include <uint256.h>
#include <vector>

Include dependency graph for chain.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Classes
class	CBlockFileInfo
struct	CDiskBlockPos
class	CBlockIndex
	The block chain is a tree shaped structure starting with the genesis block at the root, with each block potentially having multiple candidates to be the next block. More...
class	CDiskBlockIndex
	Used to marshal pointers into hashes for db storage. More...
class	CChain
	An in-memory indexed chain of blocks. More...

Enumerations
enum	BlockStatus : uint32_t {   BLOCK_VALID_UNKNOWN = 0, BLOCK_VALID_HEADER = 1, BLOCK_VALID_TREE = 2, BLOCK_VALID_TRANSACTIONS = 3,   BLOCK_VALID_CHAIN = 4, BLOCK_VALID_SCRIPTS = 5, BLOCK_VALID_MASK, BLOCK_HAVE_DATA = 8,   BLOCK_HAVE_UNDO = 16, BLOCK_HAVE_MASK = BLOCK_HAVE_DATA | BLOCK_HAVE_UNDO, BLOCK_FAILED_VALID = 32, BLOCK_FAILED_CHILD = 64,   BLOCK_FAILED_MASK = BLOCK_FAILED_VALID | BLOCK_FAILED_CHILD, BLOCK_CONFLICT_CHAINLOCK = 128 }

Functions
arith_uint256	GetBlockProof (const CBlockIndex &block)
int64_t	GetBlockProofEquivalentTime (const CBlockIndex &to, const CBlockIndex &from, const CBlockIndex &tip, const Consensus::Params &)
	Return the time it would take to redo the work difference between from and to, assuming the current hashrate corresponds to the difficulty at tip, in seconds. More...
const CBlockIndex *	LastCommonAncestor (const CBlockIndex *pa, const CBlockIndex *pb)
	Find the forking point between two chain tips. More...

Variables
static const int64_t	MAX_FUTURE_BLOCK_TIME = 2 * 60 * 60
	Maximum amount of time that a block timestamp is allowed to exceed the current network-adjusted time before the block will be accepted. More...
static const int64_t	TIMESTAMP_WINDOW = MAX_FUTURE_BLOCK_TIME
	Timestamp window used as a grace period by code that compares external timestamps (such as timestamps passed to RPCs, or wallet key creation times) to block timestamps. More...

Enumeration Type Documentation

BlockStatus

enum BlockStatus : uint32_t

Enumerator
BLOCK_VALID_UNKNOWN	Unused.
BLOCK_VALID_HEADER	Parsed, version ok, hash satisfies claimed PoW, 1 <= vtx count <= max, timestamp not in future.
BLOCK_VALID_TREE	All parent headers found, difficulty matches, timestamp >= median previous, checkpoint. Implies all parents are also at least TREE.
BLOCK_VALID_TRANSACTIONS	Only first tx is coinbase, 2 <= coinbase input script length <= 100, transactions valid, no duplicate txids, sigops, size, merkle root. Implies all parents are at least TREE but not necessarily TRANSACTIONS. When all parent blocks also have TRANSACTIONS, CBlockIndex::nChainTx will be set.
BLOCK_VALID_CHAIN	Outputs do not overspend inputs, no double spends, coinbase output ok, no immature coinbase spends, BIP30. Implies all parents are also at least CHAIN.
BLOCK_VALID_SCRIPTS	Scripts & signatures ok. Implies all parents are also at least SCRIPTS.
BLOCK_VALID_MASK	All validity bits.
BLOCK_HAVE_DATA	full block available in blk*.dat
BLOCK_HAVE_UNDO	undo data available in rev*.dat
BLOCK_HAVE_MASK
BLOCK_FAILED_VALID	stage after last reached validness failed
BLOCK_FAILED_CHILD	descends from failed block
BLOCK_FAILED_MASK
BLOCK_CONFLICT_CHAINLOCK	conflicts with chainlock system

Definition at line 125 of file chain.h.

Function Documentation

GetBlockProof()

arith_uint256 GetBlockProof

(

const CBlockIndex &

block

)

Definition at line 121 of file chain.cpp.

References CBlockIndex::nBits, and arith_uint256::SetCompact().

Referenced by CChainState::AddToBlockIndex(), CheckForkWarningConditions(), CheckForkWarningConditionsOnNewFork(), GetBlockProofEquivalentTime(), and CChainState::LoadBlockIndex().

GetBlockProofEquivalentTime()

int64_t GetBlockProofEquivalentTime	(	const CBlockIndex &	to,
		const CBlockIndex &	from,
		const CBlockIndex &	tip,
		const Consensus::Params &
	)

Return the time it would take to redo the work difference between from and to, assuming the current hashrate corresponds to the difficulty at tip, in seconds.

Definition at line 136 of file chain.cpp.

References base_uint< BITS >::bits(), GetBlockProof(), base_uint< BITS >::GetLow64(), CBlockIndex::nChainWork, and Consensus::Params::nPowTargetSpacing.

Referenced by BlockRequestAllowed(), and CChainState::ConnectBlock().

LastCommonAncestor()

const CBlockIndex* LastCommonAncestor	(	const CBlockIndex *	pa,
		const CBlockIndex *	pb
	)

Find the forking point between two chain tips.

Find the forking point between two chain tips.

Both pa and pb must be non-nullptr.

Definition at line 155 of file chain.cpp.

References CBlockIndex::GetAncestor(), CBlockIndex::nHeight, and CBlockIndex::pprev.

Referenced by CChainState::ReplayBlocks().

Variable Documentation

MAX_FUTURE_BLOCK_TIME

const int64_t MAX_FUTURE_BLOCK_TIME = 2 * 60 * 60

static

Maximum amount of time that a block timestamp is allowed to exceed the current network-adjusted time before the block will be accepted.

Definition at line 21 of file chain.h.

Referenced by ContextualCheckBlockHeader().

TIMESTAMP_WINDOW

const int64_t TIMESTAMP_WINDOW = MAX_FUTURE_BLOCK_TIME

static

Timestamp window used as a grace period by code that compares external timestamps (such as timestamps passed to RPCs, or wallet key creation times) to block timestamps.

This should be set at least as high as MAX_FUTURE_BLOCK_TIME.

Definition at line 29 of file chain.h.

Referenced by BOOST_FIXTURE_TEST_CASE(), CWallet::CreateWalletFromFile(), CWallet::GetKeyBirthTimes(), importmulti(), pruneblockchain(), and CWallet::RescanFromTime().