blockfitter.h

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// Copyright (c) 2025 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef BITCOIN_NODE_BLOCKFITTER_H
#define BITCOIN_NODE_BLOCKFITTER_H
 
#include <consensus/amount.h>
#include <feerate.h>
 
#include <cstdint>
 
class Config;
 
namespace node {
class BlockFitter {
    // Configuration parameters for the block size
    uint64_t nMaxGeneratedBlockSize;
    uint64_t nMaxGeneratedBlockSigChecks;
    CFeeRate blockMinFeeRate;
 
public:
    static constexpr uint64_t COINBASE_RESERVED_SIZE{1000};
    static constexpr uint64_t COINBASE_RESERVED_SIGCHECKS{100};
 
    // Information on the current status of the block
    uint64_t nBlockSize;
    uint64_t nBlockTx;
    uint64_t nBlockSigChecks;
    Amount nFees;
 
    struct Options {
        Options();
        uint64_t nExcessiveBlockSize;
        uint64_t nMaxGeneratedBlockSize;
        CFeeRate blockMinFeeRate;
    };
 
    BlockFitter(const Options &options);
    BlockFitter(const Config &config);
 
    uint64_t getMaxGeneratedBlockSize() const { return nMaxGeneratedBlockSize; }
 
    void resetBlock();
 
    void addTx(size_t txSize, int64_t txSigChecks, Amount txFee);
    void removeTxUnchecked(size_t txSize, int64_t txSigChecks, Amount txFee);
 
    bool testTxFits(uint64_t txSize, int64_t txSigChecks) const;
 
    /* Check if the tx feerate is enough to be included in the block */
    bool isBelowBlockMinFeeRate(const CFeeRate &txFeeRate) const;
};
} // namespace node
 
#endif // BITCOIN_NODE_BLOCKFITTER_H