Differential D6337 Diff 20816 src/index/blockfilterindex.h

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src/index/blockfilterindex.h

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				// Copyright (c) 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_BLOCKFILTERINDEX_H
				#define BITCOIN_INDEX_BLOCKFILTERINDEX_H

				#include <blockfilter.h>
				#include <chain.h>
				#include <flatfile.h>
				#include <index/base.h>

				/**
				* BlockFilterIndex is used to store and retrieve block filters, hashes, and
				* headers for a range of blocks by height. An index is constructed for each
				* supported filter type with its own database (ie. filter data for different
				* types are stored in separate databases).
				*
				* This index is used to serve BIP 157 net requests.
				*/
				class BlockFilterIndex final : public BaseIndex {
				private:
				BlockFilterType m_filter_type;
				std::string m_name;
				std::unique_ptr<BaseIndex::DB> m_db;

				FlatFilePos m_next_filter_pos;
				std::unique_ptr<FlatFileSeq> m_filter_fileseq;

				size_t WriteFilterToDisk(FlatFilePos &pos, const BlockFilter &filter);

				protected:
				bool Init() override;

				bool CommitInternal(CDBBatch &batch) override;

				bool WriteBlock(const CBlock &block, const CBlockIndex *pindex) override;

				bool Rewind(const CBlockIndex *current_tip,
				const CBlockIndex *new_tip) override;

				BaseIndex::DB &GetDB() const override { return *m_db; }

				const char *GetName() const override { return m_name.c_str(); }

				public:
				/** Constructs the index, which becomes available to be queried. */
				explicit BlockFilterIndex(BlockFilterType filter_type, size_t n_cache_size,
				bool f_memory = false, bool f_wipe = false);

				BlockFilterType GetFilterType() const { return m_filter_type; }
				};

				#endif // BITCOIN_INDEX_BLOCKFILTERINDEX_H