99 lines
2.9 KiB
C++
99 lines
2.9 KiB
C++
// This file Copyright © 2010-2022 Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0), GPLv3 (SPDX: GPL-3.0),
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// or any future license endorsed by Mnemosyne LLC.
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// License text can be found in the licenses/ folder.
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#pragma once
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#ifndef __TRANSMISSION__
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#error only libtransmission should #include this header.
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#endif
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#include <cstdint> // intX_t, uintX_t
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#include <memory> // std::unique_ptr
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#include <utility> // std::pair
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#include <vector>
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#include "transmission.h"
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#include "block-info.h"
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class tr_torrents;
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struct evbuffer;
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struct tr_torrent;
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class Cache
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{
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public:
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Cache(tr_torrents& torrents, int64_t max_bytes);
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int setLimit(int64_t new_limit);
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[[nodiscard]] constexpr auto getLimit() const noexcept
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{
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return max_bytes_;
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}
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void writeBlock(tr_torrent_id_t tor, tr_block_index_t block, std::unique_ptr<std::vector<uint8_t>>& writeme);
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int readBlock(tr_torrent* torrent, tr_block_info::Location loc, uint32_t len, uint8_t* setme);
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int prefetchBlock(tr_torrent* torrent, tr_block_info::Location loc, uint32_t len);
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int flushTorrent(tr_torrent* torrent);
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int flushFile(tr_torrent* torrent, tr_file_index_t file);
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private:
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using Key = std::pair<tr_torrent_id_t, tr_block_index_t>;
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struct CacheBlock
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{
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Key key;
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std::unique_ptr<std::vector<uint8_t>> buf;
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time_t time_added = {};
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};
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using Blocks = std::vector<CacheBlock>;
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using CIter = Blocks::const_iterator;
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struct CompareCacheBlockByKey
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{
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[[nodiscard]] constexpr bool operator()(Key const& key, CacheBlock const& block)
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{
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return key < block.key;
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}
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[[nodiscard]] constexpr bool operator()(CacheBlock const& block, Key const& key)
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{
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return block.key < key;
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}
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};
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[[nodiscard]] static Key makeKey(tr_torrent const* torrent, tr_block_info::Location loc) noexcept;
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[[nodiscard]] static std::pair<CIter, CIter> findContiguous(CIter const begin, CIter const end, CIter const iter) noexcept;
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// @return any error code from tr_ioWrite()
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[[nodiscard]] int writeContiguous(CIter const begin, CIter const end) const;
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// @return any error code from writeContiguous()
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[[nodiscard]] int flushSpan(CIter const begin, CIter const end);
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// @return any error code from writeContiguous()
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[[nodiscard]] int flushOldest();
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// @return any error code from writeContiguous()
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[[nodiscard]] int cacheTrim();
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[[nodiscard]] static size_t getMaxBlocks(int64_t max_bytes) noexcept;
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[[nodiscard]] CIter getBlock(tr_torrent const* torrent, tr_block_info::Location loc) noexcept;
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tr_torrents& torrents_;
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Blocks blocks_ = {};
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size_t max_blocks_ = 0;
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size_t max_bytes_ = 0;
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mutable size_t disk_writes_ = 0;
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mutable size_t disk_write_bytes_ = 0;
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mutable size_t cache_writes_ = 0;
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mutable size_t cache_write_bytes_ = 0;
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};
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