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// Copyright (c) 2018-2022 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 <attributes.h>
#include <blockfilter.h>
#include <chain.h>
#include <flatfile.h>
#include <index/base.h>
#include <util/hasher.h>
#include <unordered_map>
static const char* const DEFAULT_BLOCKFILTERINDEX = "0";
/** Interval between compact filter checkpoints. See BIP 157. */
static constexpr int CFCHECKPT_INTERVAL = 1000;
/**
* 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::unique_ptr<BaseIndex::DB> m_db;
FlatFilePos m_next_filter_pos;
std::unique_ptr<FlatFileSeq> m_filter_fileseq;
bool ReadFilterFromDisk(const FlatFilePos& pos, const uint256& hash, BlockFilter& filter) const;
size_t WriteFilterToDisk(FlatFilePos& pos, const BlockFilter& filter);
Mutex m_cs_headers_cache;
/** cache of block hash to filter header, to avoid disk access when responding to getcfcheckpt. */
std::unordered_map<uint256, uint256, FilterHeaderHasher> m_headers_cache GUARDED_BY(m_cs_headers_cache);
bool AllowPrune() const override { return true; }
protected:
bool CustomInit(const std::optional<interfaces::BlockKey>& block) override;
bool CustomCommit(CDBBatch& batch) override;
bool CustomAppend(const interfaces::BlockInfo& block) override;
bool CustomRewind(const interfaces::BlockKey& current_tip, const interfaces::BlockKey& new_tip) override;
BaseIndex::DB& GetDB() const LIFETIMEBOUND override { return *m_db; }
public:
/** Constructs the index, which becomes available to be queried. */
explicit BlockFilterIndex(std::unique_ptr<interfaces::Chain> chain, BlockFilterType filter_type,
size_t n_cache_size, bool f_memory = false, bool f_wipe = false);
BlockFilterType GetFilterType() const { return m_filter_type; }
/** Get a single filter by block. */
bool LookupFilter(const CBlockIndex* block_index, BlockFilter& filter_out) const;
/** Get a single filter header by block. */
bool LookupFilterHeader(const CBlockIndex* block_index, uint256& header_out) EXCLUSIVE_LOCKS_REQUIRED(!m_cs_headers_cache);
/** Get a range of filters between two heights on a chain. */
bool LookupFilterRange(int start_height, const CBlockIndex* stop_index,
std::vector<BlockFilter>& filters_out) const;
/** Get a range of filter hashes between two heights on a chain. */
bool LookupFilterHashRange(int start_height, const CBlockIndex* stop_index,
std::vector<uint256>& hashes_out) const;
};
/**
* Get a block filter index by type. Returns nullptr if index has not been initialized or was
* already destroyed.
*/
BlockFilterIndex* GetBlockFilterIndex(BlockFilterType filter_type);
/** Iterate over all running block filter indexes, invoking fn on each. */
void ForEachBlockFilterIndex(std::function<void (BlockFilterIndex&)> fn);
/**
* Initialize a block filter index for the given type if one does not already exist. Returns true if
* a new index is created and false if one has already been initialized.
*/
bool InitBlockFilterIndex(std::function<std::unique_ptr<interfaces::Chain>()> make_chain, BlockFilterType filter_type,
size_t n_cache_size, bool f_memory = false, bool f_wipe = false);
/**
* Destroy the block filter index with the given type. Returns false if no such index exists. This
* just releases the allocated memory and closes the database connection, it does not delete the
* index data.
*/
bool DestroyBlockFilterIndex(BlockFilterType filter_type);
/** Destroy all open block filter indexes. */
void DestroyAllBlockFilterIndexes();
#endif // BITCOIN_INDEX_BLOCKFILTERINDEX_H
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