miner.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-present 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 <interfaces/types.h>
#include <node/types.h>
#include <policy/policy.h>
#include <primitives/block.h>
#include <txmempool.h>
#include <util/feefrac.h>

#include <cstdint>
#include <memory>
#include <optional>

#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; };

using interfaces::BlockRef;

namespace node {
class KernelNotifications;

static const bool DEFAULT_PRINT_MODIFIED_FEE = false;

struct CBlockTemplate
{
    CBlock block;
    // Fees per transaction, not including coinbase transaction (unlike CBlock::vtx).
    std::vector<CAmount> vTxFees;
    // Sigops per transaction, not including coinbase transaction (unlike CBlock::vtx).
    std::vector<int64_t> vTxSigOpsCost;
    /* A vector of package fee rates, ordered by the sequence in which
     * packages are selected for inclusion in the block template.*/
    std::vector<FeePerVSize> m_package_feerates;
    /*
     * Template containing all coinbase transaction fields that are set by our
     * miner code.
     */
    CoinbaseTx m_coinbase_tx;
};

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;

    // 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 : BlockCreateOptions {
        // 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);

    std::unique_ptr<CBlockTemplate> CreateNewBlock();

    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
    void resetBlock();
    void AddToBlock(const CTxMemPoolEntry& entry);

    // Methods for how to add transactions to a block.
    void addChunks() EXCLUSIVE_LOCKS_REQUIRED(m_mempool->cs);

    // helper functions for addChunks()
    bool TestChunkBlockLimits(FeePerWeight chunk_feerate, int64_t chunk_sigops_cost) const;
    bool TestChunkTransactions(const std::vector<CTxMemPoolEntryRef>& txs) const;
};

int64_t GetMinimumTime(const CBlockIndex* pindexPrev, int64_t difficulty_adjustment_interval);

int64_t UpdateTime(CBlockHeader* pblock, const Consensus::Params& consensusParams, const CBlockIndex* pindexPrev);

void RegenerateCommitments(CBlock& block, ChainstateManager& chainman);

void ApplyArgsManOptions(const ArgsManager& gArgs, BlockAssembler::Options& options);

/* Compute the block's merkle root, insert or replace the coinbase transaction and the merkle root into the block */
void AddMerkleRootAndCoinbase(CBlock& block, CTransactionRef coinbase, uint32_t version, uint32_t timestamp, uint32_t nonce);


/* Interrupt a blocking call. */
void InterruptWait(KernelNotifications& kernel_notifications, bool& interrupt_wait);
std::unique_ptr<CBlockTemplate> WaitAndCreateNewBlock(ChainstateManager& chainman,
                                                      KernelNotifications& kernel_notifications,
                                                      CTxMemPool* mempool,
                                                      const std::unique_ptr<CBlockTemplate>& block_template,
                                                      const BlockWaitOptions& options,
                                                      const BlockAssembler::Options& assemble_options,
                                                      bool& interrupt_wait);

/* Locks cs_main and returns the block hash and block height of the active chain if it exists; otherwise, returns nullopt.*/
std::optional<BlockRef> GetTip(ChainstateManager& chainman);

/* Waits for the connected tip to change until timeout has elapsed. During node initialization, this will wait until the tip is connected (regardless of `timeout`).
 * Returns the current tip, or nullopt if the node is shutting down or interrupt()
 * is called.
 */
std::optional<BlockRef> WaitTipChanged(ChainstateManager& chainman, KernelNotifications& kernel_notifications, const uint256& current_tip, MillisecondsDouble& timeout, bool& interrupt);

bool CooldownIfHeadersAhead(ChainstateManager& chainman, KernelNotifications& kernel_notifications, const BlockRef& last_tip, bool& interrupt_mining);
} // namespace node

#endif // BITCOIN_NODE_MINER_H