transmission/libtransmission/completion.h

193 lines
4.7 KiB
C++

// This file Copyright © 2009-2023 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#pragma once
#ifndef __TRANSMISSION__
#error only libtransmission should #include this header.
#endif
#include <algorithm>
#include <cstdint>
#include <cstddef> // size_t
#include <optional>
#include <vector>
#include "transmission.h"
#include "block-info.h"
#include "bitfield.h"
/**
* @brief knows which blocks and pieces we have
*/
struct tr_completion
{
struct torrent_view
{
virtual bool pieceIsWanted(tr_piece_index_t piece) const = 0;
virtual ~torrent_view() = default;
};
explicit tr_completion(torrent_view const* tor, tr_block_info const* block_info)
: tor_{ tor }
, block_info_{ block_info }
, blocks_{ block_info_->blockCount() }
{
blocks_.setHasNone();
}
[[nodiscard]] constexpr tr_bitfield const& blocks() const noexcept
{
return blocks_;
}
[[nodiscard]] constexpr bool hasAll() const noexcept
{
return hasMetainfo() && blocks_.hasAll();
}
[[nodiscard]] TR_CONSTEXPR20 bool hasBlock(tr_block_index_t block) const
{
return blocks_.test(block);
}
[[nodiscard]] bool hasBlocks(tr_block_span_t span) const
{
return blocks_.count(span.begin, span.end) == span.end - span.begin;
}
[[nodiscard]] constexpr bool hasNone() const noexcept
{
return !hasMetainfo() || blocks_.hasNone();
}
[[nodiscard]] bool hasPiece(tr_piece_index_t piece) const
{
return block_info_->pieceSize() != 0 && countMissingBlocksInPiece(piece) == 0;
}
[[nodiscard]] constexpr uint64_t hasTotal() const noexcept
{
return size_now_;
}
[[nodiscard]] uint64_t hasValid() const;
[[nodiscard]] auto leftUntilDone() const
{
return sizeWhenDone() - hasTotal();
}
[[nodiscard]] constexpr double percentComplete() const
{
auto const denom = block_info_->totalSize();
return denom ? std::clamp(double(size_now_) / denom, 0.0, 1.0) : 0.0;
}
[[nodiscard]] double percentDone() const
{
auto const denom = sizeWhenDone();
return denom ? std::clamp(double(size_now_) / denom, 0.0, 1.0) : 0.0;
}
[[nodiscard]] uint64_t sizeWhenDone() const;
[[nodiscard]] tr_completeness status() const
{
if (!hasMetainfo())
{
return TR_LEECH;
}
if (hasAll())
{
return TR_SEED;
}
if (size_now_ == sizeWhenDone())
{
return TR_PARTIAL_SEED;
}
return TR_LEECH;
}
[[nodiscard]] std::vector<uint8_t> createPieceBitfield() const;
[[nodiscard]] size_t countMissingBlocksInPiece(tr_piece_index_t piece) const
{
auto const [begin, end] = block_info_->blockSpanForPiece(piece);
return (end - begin) - blocks_.count(begin, end);
}
[[nodiscard]] size_t countMissingBytesInPiece(tr_piece_index_t piece) const
{
return block_info_->pieceSize(piece) - countHasBytesInPiece(piece);
}
void amountDone(float* tab, size_t n_tabs) const;
void addBlock(tr_block_index_t block);
void addPiece(tr_piece_index_t piece);
void removePiece(tr_piece_index_t piece);
void setHasPiece(tr_piece_index_t i, bool has)
{
if (has)
{
addPiece(i);
}
else
{
removePiece(i);
}
}
void setHasAll() noexcept;
void setBlocks(tr_bitfield blocks);
void invalidateSizeWhenDone()
{
size_when_done_.reset();
}
[[nodiscard]] uint64_t countHasBytesInSpan(tr_byte_span_t) const;
[[nodiscard]] constexpr bool hasMetainfo() const noexcept
{
return !std::empty(blocks_);
}
private:
[[nodiscard]] uint64_t computeHasValid() const;
[[nodiscard]] uint64_t computeSizeWhenDone() const;
[[nodiscard]] uint64_t countHasBytesInPiece(tr_piece_index_t piece) const
{
return countHasBytesInSpan(block_info_->byteSpanForPiece(piece));
}
void removeBlock(tr_block_index_t block);
torrent_view const* tor_;
tr_block_info const* block_info_;
tr_bitfield blocks_{ 0 };
// Number of bytes we'll have when done downloading. [0..totalSize]
// Mutable because lazy-calculated
mutable std::optional<uint64_t> size_when_done_;
// Number of verified bytes we have right now. [0..totalSize]
// Mutable because lazy-calculated
mutable std::optional<uint64_t> has_valid_;
// Number of bytes we have now. [0..sizeWhenDone]
uint64_t size_now_ = 0;
};