比特币源码阅读(区块-CBlock)

1. CBlock

   
   CBlock

源码：
src/primitives/block.h

class CBlock : public CBlockHeader
{
public:
    // network and disk
    std::vector<CTransactionRef> vtx; //vector<CTransaction> 比CBlockHeader多了这个

    // memory only
    mutable bool fChecked;

    CBlock()
    {
        SetNull();
    }

    CBlock(const CBlockHeader &header)
    {
        SetNull();
        *(static_cast<CBlockHeader*>(this)) = header; //强制转换
    }

    ADD_SERIALIZE_METHODS;

    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action) {
        READWRITEAS(CBlockHeader, *this);
        READWRITE(vtx);
    }

    void SetNull()
    {
        CBlockHeader::SetNull();
        vtx.clear();
        fChecked = false;
    }

    CBlockHeader GetBlockHeader() const
    {
        CBlockHeader block;
        block.nVersion       = nVersion;
        block.hashPrevBlock  = hashPrevBlock;
        block.hashMerkleRoot = hashMerkleRoot;
        block.nTime          = nTime;
        block.nBits          = nBits;
        block.nNonce         = nNonce;
        return block;
    }

    std::string ToString() const;
};

2.区块hash的取值规则:

计算hash时不算vtx
具体计算规则可参考：https://en.bitcoin.it/wiki/Block_hashing_algorithm
src/primitives/block.cpp

#include <primitives/block.h>

#include <hash.h>
#include <tinyformat.h>
#include <utilstrencodings.h>
#include <crypto/common.h>

uint256 CBlockHeader::GetHash() const
{
    return SerializeHash(*this); //前面看到this的赋值是header对象 (具体实现呢？)
}

std::string CBlock::ToString() const
{
    std::stringstream s;
    s << strprintf("CBlock(hash=%s, ver=0x%08x, hashPrevBlock=%s, hashMerkleRoot=%s, nTime=%u, nBits=%08x, nNonce=%u, vtx=%u)\n",
        GetHash().ToString(),
        nVersion,
        hashPrevBlock.ToString(),
        hashMerkleRoot.ToString(),
        nTime, nBits, nNonce,
        vtx.size());
    for (const auto& tx : vtx) {
        s << "  " << tx->ToString() << "\n";
    }
    return s.str();
}