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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_NODE_MINER_H
#define BITCOIN_NODE_MINER_H
#include <policy/policy.h>
#include <primitives/block.h>
#include <txmempool.h>
#include <memory>
#include <optional>
#include <stdint.h>
#include <boost/multi_index/identity.hpp>
#include <boost/multi_index/indexed_by.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <boost/multi_index/tag.hpp>
#include <boost/multi_index_container.hpp>
class ArgsManager;
class CBlockIndex;
class CChainParams;
class CScript;
class Chainstate;
class ChainstateManager;
namespace Consensus { struct Params; };
namespace node {
static const bool DEFAULT_PRINT_MODIFIED_FEE = 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 {
explicit CTxMemPoolModifiedEntry(CTxMemPool::txiter entry)
{
iter = entry;
nSizeWithAncestors = entry->GetSizeWithAncestors();
nModFeesWithAncestors = entry->GetModFeesWithAncestors();
nSigOpCostWithAncestors = entry->GetSigOpCostWithAncestors();
}
CAmount GetModifiedFee() const { return iter->GetModifiedFee(); }
uint64_t GetSizeWithAncestors() const { return nSizeWithAncestors; }
CAmount GetModFeesWithAncestors() const { return nModFeesWithAncestors; }
size_t GetTxSize() const { return iter->GetTxSize(); }
const CTransaction& GetTx() const { return iter->GetTx(); }
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;
}
};
// 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) const
{
if (a->GetCountWithAncestors() != b->GetCountWithAncestors()) {
return a->GetCountWithAncestors() < b->GetCountWithAncestors();
}
return CompareIteratorByHash()(a, b);
}
};
typedef boost::multi_index_container<
CTxMemPoolModifiedEntry,
boost::multi_index::indexed_by<
boost::multi_index::ordered_unique<
modifiedentry_iter,
CompareCTxMemPoolIter
>,
// sorted by modified ancestor fee rate
boost::multi_index::ordered_non_unique<
// Reuse same tag from CTxMemPool's similar index
boost::multi_index::tag<ancestor_score>,
boost::multi_index::identity<CTxMemPoolModifiedEntry>,
CompareTxMemPoolEntryByAncestorFee
>
>
> 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
{
explicit update_for_parent_inclusion(CTxMemPool::txiter it) : iter(it) {}
void operator() (CTxMemPoolModifiedEntry &e)
{
e.nModFeesWithAncestors -= iter->GetModifiedFee();
e.nSizeWithAncestors -= iter->GetTxSize();
e.nSigOpCostWithAncestors -= iter->GetSigOpCost();
}
CTxMemPool::txiter iter;
};
/** Generate a new block, without valid proof-of-work */
class BlockAssembler
{
private:
// The constructed block template
std::unique_ptr<CBlockTemplate> pblocktemplate;
// Information on the current status of the block
uint64_t nBlockWeight;
uint64_t nBlockTx;
uint64_t nBlockSigOpsCost;
CAmount nFees;
std::unordered_set<Txid, SaltedTxidHasher> inBlock;
// Chain context for the block
int nHeight;
int64_t m_lock_time_cutoff;
const CChainParams& chainparams;
const CTxMemPool* const m_mempool;
Chainstate& m_chainstate;
public:
struct Options {
// Configuration parameters for the block size
size_t nBlockMaxWeight{DEFAULT_BLOCK_MAX_WEIGHT};
CFeeRate blockMinFeeRate{DEFAULT_BLOCK_MIN_TX_FEE};
// Whether to call TestBlockValidity() at the end of CreateNewBlock().
bool test_block_validity{true};
bool print_modified_fee{DEFAULT_PRINT_MODIFIED_FEE};
};
explicit BlockAssembler(Chainstate& chainstate, const CTxMemPool* mempool, const Options& options);
/** Construct a new block template with coinbase to scriptPubKeyIn */
std::unique_ptr<CBlockTemplate> CreateNewBlock(const CScript& scriptPubKeyIn);
inline static std::optional<int64_t> m_last_block_num_txs{};
inline static std::optional<int64_t> m_last_block_weight{};
private:
const Options m_options;
// 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
* Increments nPackagesSelected / nDescendantsUpdated with corresponding
* statistics from the package selection (for logging statistics). */
void addPackageTxs(const CTxMemPool& mempool, int& nPackagesSelected, int& nDescendantsUpdated) EXCLUSIVE_LOCKS_REQUIRED(mempool.cs);
// 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) const;
/** 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) const;
/** Sort the package in an order that is valid to appear in a block */
void SortForBlock(const CTxMemPool::setEntries& package, std::vector<CTxMemPool::txiter>& sortedEntries);
};
int64_t UpdateTime(CBlockHeader* pblock, const Consensus::Params& consensusParams, const CBlockIndex* pindexPrev);
/** Update an old GenerateCoinbaseCommitment from CreateNewBlock after the block txs have changed */
void RegenerateCommitments(CBlock& block, ChainstateManager& chainman);
/** Apply -blockmintxfee and -blockmaxweight options from ArgsManager to BlockAssembler options. */
void ApplyArgsManOptions(const ArgsManager& gArgs, BlockAssembler::Options& options);
} // namespace node
#endif // BITCOIN_NODE_MINER_H
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