chain.h File Reference

#include <arith_uint256.h>
#include <consensus/params.h>
#include <flatfile.h>
#include <kernel/cs_main.h>
#include <primitives/block.h>
#include <sync.h>
#include <uint256.h>
#include <util/time.h>
#include <vector>

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Classes
class	CBlockFileInfo
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_RESERVED = 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_OPT_WITNESS = 128 , BLOCK_ASSUMED_VALID = 256 }

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...
CBlockLocator	GetLocator (const CBlockIndex *index)
	Get a locator for a block index entry. More...
std::vector< uint256 >	LocatorEntries (const CBlockIndex *index)
	Construct a list of hash entries to put in a locator. More...

Variables
static constexpr 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 constexpr 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...
static constexpr int64_t	MAX_BLOCK_TIME_GAP = 90 * 60
	Maximum gap between node time and block time used for the "Catching up..." mode in GUI. More...

Enumeration Type Documentation

BlockStatus

enum BlockStatus : uint32_t

Enumerator
BLOCK_VALID_UNKNOWN	Unused.
BLOCK_VALID_RESERVED	Reserved (was BLOCK_VALID_HEADER).
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 either at least VALID_CHAIN, or are ASSUMED_VALID
BLOCK_VALID_SCRIPTS	Scripts & signatures ok. Implies all parents are either at least VALID_SCRIPTS, or are ASSUMED_VALID.
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_OPT_WITNESS	block data in blk*.dat was received with a witness-enforcing client
BLOCK_ASSUMED_VALID	If ASSUMED_VALID is set, it means that this block has not been validated and has validity status less than VALID_SCRIPTS. Also that it may have descendant blocks with VALID_SCRIPTS set, because they can be validated based on an assumeutxo snapshot. When an assumeutxo snapshot is loaded, the ASSUMED_VALID flag is added to unvalidated blocks at the snapshot height and below. Then, as the background validation progresses, and these blocks are validated, the ASSUMED_VALID flags are removed. See doc/design/assumeutxo.md for details. This flag is only used to implement checks in CheckBlockIndex() and should not be used elsewhere.

Definition at line 83 of file chain.h.

Function Documentation

GetBlockProof()

arith_uint256 GetBlockProof

(

const CBlockIndex &

block

)

Definition at line 131 of file chain.cpp.

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GetBlockProofEquivalentTime()

int64_t GetBlockProofEquivalentTime	(	const CBlockIndex &	to,
		const CBlockIndex &	from,
		const CBlockIndex &	tip,
		const Consensus::Params &	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 146 of file chain.cpp.

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GetLocator()

CBlockLocator GetLocator

(

const CBlockIndex *

index

)

Get a locator for a block index entry.

Definition at line 50 of file chain.cpp.

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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 165 of file chain.cpp.

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LocatorEntries()

std::vector<uint256> LocatorEntries

(

const CBlockIndex *

index

)

Construct a list of hash entries to put in a locator.

Definition at line 31 of file chain.cpp.

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Variable Documentation

MAX_BLOCK_TIME_GAP

constexpr int64_t MAX_BLOCK_TIME_GAP = 90 * 60

staticconstexpr

Maximum gap between node time and block time used for the "Catching up..." mode in GUI.

Ref: https://github.com/bitcoin/bitcoin/pull/1026

Definition at line 40 of file chain.h.

MAX_FUTURE_BLOCK_TIME

constexpr int64_t MAX_FUTURE_BLOCK_TIME = 2 * 60 * 60

staticconstexpr

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 24 of file chain.h.

TIMESTAMP_WINDOW

constexpr int64_t TIMESTAMP_WINDOW = MAX_FUTURE_BLOCK_TIME

staticconstexpr

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 32 of file chain.h.