git / moonbite-core / src/index/txindex.h · raw

// Copyright (c) 2017-2018 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_INDEX_TXINDEX_H#define BITCOIN_INDEX_TXINDEX_H#include <chain.h>#include <index/base.h>#include <txdb.h>/** * TxIndex is used to look up transactions included in the blockchain by hash. * The index is written to a LevelDB database and records the filesystem * location of each transaction by transaction hash. */class TxIndex final : public BaseIndex{protected:    class DB;private:    const std::unique_ptr<DB> m_db;protected:    /// Override base class init to migrate from old database.    bool Init() override;    bool WriteBlock(const CBlock& block, const CBlockIndex* pindex) override;    BaseIndex::DB& GetDB() const override;    const char* GetName() const override { return "txindex"; }public:    /// Constructs the index, which becomes available to be queried.    explicit TxIndex(size_t n_cache_size, bool f_memory = false, bool f_wipe = false);    // Destructor is declared because this class contains a unique_ptr to an incomplete type.    virtual ~TxIndex() override;    /// Look up a transaction by hash.    ///    /// @param[in]   tx_hash  The hash of the transaction to be returned.    /// @param[out]  block_hash  The hash of the block the transaction is found in.    /// @param[out]  tx  The transaction itself.    /// @return  true if transaction is found, false otherwise    bool FindTx(const uint256& tx_hash, uint256& block_hash, CTransactionRef& tx) const;};/// The global transaction index, used in GetTransaction. May be null.extern std::unique_ptr<TxIndex> g_txindex;#endif // BITCOIN_INDEX_TXINDEX_H