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Merge 7317e14a44 into merged_master (Bitcoin PR bitcoin/bitcoin#22263)

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Andrew Poelstra 2021-07-28 16:09:13 +00:00
commit 3c48d95401
6 changed files with 37 additions and 34 deletions
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29
src/txdb.cpp
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@ -194,9 +194,34 @@ bool CBlockTreeDB::ReadLastBlockFile(int &nFile) {
return Read(DB_LAST_BLOCK, nFile);
}
CCoinsViewCursor *CCoinsViewDB::Cursor() const
/** Specialization of CCoinsViewCursor to iterate over a CCoinsViewDB */
class CCoinsViewDBCursor: public CCoinsViewCursor
{
CCoinsViewDBCursor *i = new CCoinsViewDBCursor(const_cast<CDBWrapper&>(*m_db).NewIterator(), GetBestBlock());
public:
// Prefer using CCoinsViewDB::Cursor() since we want to perform some
// cache warmup on instantiation.
CCoinsViewDBCursor(CDBIterator* pcursorIn, const uint256&hashBlockIn):
CCoinsViewCursor(hashBlockIn), pcursor(pcursorIn) {}
~CCoinsViewDBCursor() {}
bool GetKey(COutPoint &key) const override;
bool GetValue(Coin &coin) const override;
unsigned int GetValueSize() const override;
bool Valid() const override;
void Next() override;
private:
std::unique_ptr<CDBIterator> pcursor;
std::pair<char, COutPoint> keyTmp;
friend class CCoinsViewDB;
};
std::unique_ptr<CCoinsViewCursor> CCoinsViewDB::Cursor() const
{
auto i = std::make_unique<CCoinsViewDBCursor>(
const_cast<CDBWrapper&>(*m_db).NewIterator(), GetBestBlock());
/* It seems that there are no "const iterators" for LevelDB. Since we
only need read operations on it, use a const-cast to get around
that restriction. */