chain.h File Reference

#include <arith_uint256.h>
#include <consensus/params.h>
#include <flatfile.h>
#include <primitives/block.h>
#include <sync.h>
#include <tinyformat.h>
#include <uint256.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...

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...
RecursiveMutex	cs_main
	Mutex to guard access to validation specific variables, such as reading or changing the chainstate. 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 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_OPT_WITNESS	block data in blk*.dat was received with a witness-enforcing client
BLOCK_ASSUMED_VALID	If set, this indicates that the block index entry is assumed-valid. Certain diagnostics will be skipped in e.g. CheckBlockIndex(). It almost certainly means that the block's full validation is pending on a background chainstate. See doc/assumeutxo.md.

Definition at line 98 of file chain.h.

Function Documentation

GetBlockProof()

arith_uint256 GetBlockProof

(

const CBlockIndex &

block

)

Definition at line 125 of file chain.cpp.

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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 140 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 159 of file chain.cpp.

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Variable Documentation

cs_main

RecursiveMutex cs_main

Mutex to guard access to validation specific variables, such as reading or changing the chainstate.

This may also need to be locked when updating the transaction pool, e.g. on AcceptToMemoryPool. See CTxMemPool::cs comment for details.

The transaction pool has a separate lock to allow reading from it and the chainstate at the same time.

Definition at line 138 of file validation.cpp.

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 39 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 23 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 31 of file chain.h.