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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or
#include "primitives/block.h"
#include "txmempool.h"
#include <stdint.h>
#include <memory>
#include "boost/multi_index_container.hpp"
#include "boost/multi_index/ordered_index.hpp"
class CBlockIndex;
class CChainParams;
class CReserveKey;
class CScript;
class CWallet;
namespace Consensus { struct Params; };
static const bool DEFAULT_PRINTPRIORITY = false;
struct CBlockTemplate
CBlock block;
std::vector<CAmount> vTxFees;
std::vector<int64_t> vTxSigOpsCost;
std::vector<unsigned char> vchCoinbaseCommitment;
// Container for tracking updates to ancestor feerate as we include (parent)
// transactions in a block
struct CTxMemPoolModifiedEntry {
CTxMemPoolModifiedEntry(CTxMemPool::txiter entry)
iter = entry;
nSizeWithAncestors = entry->GetSizeWithAncestors();
nModFeesWithAncestors = entry->GetModFeesWithAncestors();
nSigOpCostWithAncestors = entry->GetSigOpCostWithAncestors();
CTxMemPool::txiter iter;
uint64_t nSizeWithAncestors;
CAmount nModFeesWithAncestors;
int64_t nSigOpCostWithAncestors;
/** Comparator for CTxMemPool::txiter objects.
* It simply compares the internal memory address of the CTxMemPoolEntry object
* pointed to. This means it has no meaning, and is only useful for using them
* as key in other indexes.
struct CompareCTxMemPoolIter {
bool operator()(const CTxMemPool::txiter& a, const CTxMemPool::txiter& b) const
return &(*a) < &(*b);
struct modifiedentry_iter {
typedef CTxMemPool::txiter result_type;
result_type operator() (const CTxMemPoolModifiedEntry &entry) const
return entry.iter;
// This matches the calculation in CompareTxMemPoolEntryByAncestorFee,
// except operating on CTxMemPoolModifiedEntry.
// TODO: refactor to avoid duplication of this logic.
struct CompareModifiedEntry {
bool operator()(const CTxMemPoolModifiedEntry &a, const CTxMemPoolModifiedEntry &b)
double f1 = (double)a.nModFeesWithAncestors * b.nSizeWithAncestors;
double f2 = (double)b.nModFeesWithAncestors * a.nSizeWithAncestors;
if (f1 == f2) {
return CTxMemPool::CompareIteratorByHash()(a.iter, b.iter);
return f1 > f2;
// A comparator that sorts transactions based on number of ancestors.
// This is sufficient to sort an ancestor package in an order that is valid
// to appear in a block.
struct CompareTxIterByAncestorCount {
bool operator()(const CTxMemPool::txiter &a, const CTxMemPool::txiter &b)
if (a->GetCountWithAncestors() != b->GetCountWithAncestors())
return a->GetCountWithAncestors() < b->GetCountWithAncestors();
return CTxMemPool::CompareIteratorByHash()(a, b);
typedef boost::multi_index_container<
// sorted by modified ancestor fee rate
// Reuse same tag from CTxMemPool's similar index
> indexed_modified_transaction_set;
typedef indexed_modified_transaction_set::nth_index<0>::type::iterator modtxiter;
typedef indexed_modified_transaction_set::index<ancestor_score>::type::iterator modtxscoreiter;
struct update_for_parent_inclusion
update_for_parent_inclusion(CTxMemPool::txiter it) : iter(it) {}
void operator() (CTxMemPoolModifiedEntry &e)
e.nModFeesWithAncestors -= iter->GetFee();
e.nSizeWithAncestors -= iter->GetTxSize();
e.nSigOpCostWithAncestors -= iter->GetSigOpCost();
CTxMemPool::txiter iter;
/** Generate a new block, without valid proof-of-work */
class BlockAssembler
// The constructed block template
std::unique_ptr<CBlockTemplate> pblocktemplate;
// A convenience pointer that always refers to the CBlock in pblocktemplate
CBlock* pblock;
// Configuration parameters for the block size
bool fIncludeWitness;
unsigned int nBlockMaxWeight, nBlockMaxSize;
bool fNeedSizeAccounting;
CFeeRate blockMinFeeRate;
// Information on the current status of the block
uint64_t nBlockWeight;
uint64_t nBlockSize;
uint64_t nBlockTx;
uint64_t nBlockSigOpsCost;
CAmount nFees;
CTxMemPool::setEntries inBlock;
// Chain context for the block
int nHeight;
int64_t nLockTimeCutoff;
const CChainParams& chainparams;
BlockAssembler(const CChainParams& chainparams);
/** Construct a new block template with coinbase to scriptPubKeyIn */
std::unique_ptr<CBlockTemplate> CreateNewBlock(const CScript& scriptPubKeyIn);
// utility functions
/** Clear the block's state and prepare for assembling a new block */
void resetBlock();
/** Add a tx to the block */
void AddToBlock(CTxMemPool::txiter iter);
// Methods for how to add transactions to a block.
/** Add transactions based on feerate including unconfirmed ancestors */
void addPackageTxs();
// helper functions for addPackageTxs()
/** Remove confirmed (inBlock) entries from given set */
void onlyUnconfirmed(CTxMemPool::setEntries& testSet);
/** Test if a new package would "fit" in the block */
bool TestPackage(uint64_t packageSize, int64_t packageSigOpsCost);
/** Perform checks on each transaction in a package:
* locktime, premature-witness, serialized size (if necessary)
* These checks should always succeed, and they're here
* only as an extra check in case of suboptimal node configuration */
bool TestPackageTransactions(const CTxMemPool::setEntries& package);
/** Return true if given transaction from mapTx has already been evaluated,
* or if the transaction's cached data in mapTx is incorrect. */
bool SkipMapTxEntry(CTxMemPool::txiter it, indexed_modified_transaction_set &mapModifiedTx, CTxMemPool::setEntries &failedTx);
/** Sort the package in an order that is valid to appear in a block */
void SortForBlock(const CTxMemPool::setEntries& package, CTxMemPool::txiter entry, std::vector<CTxMemPool::txiter>& sortedEntries);
/** Add descendants of given transactions to mapModifiedTx with ancestor
* state updated assuming given transactions are inBlock. */
void UpdatePackagesForAdded(const CTxMemPool::setEntries& alreadyAdded, indexed_modified_transaction_set &mapModifiedTx);
/** Modify the extranonce in a block */
void IncrementExtraNonce(CBlock* pblock, const CBlockIndex* pindexPrev, unsigned int& nExtraNonce);
int64_t UpdateTime(CBlockHeader* pblock, const Consensus::Params& consensusParams, const CBlockIndex* pindexPrev);