80 lines
3.6 KiB
C++
80 lines
3.6 KiB
C++
// This file Copyright © Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
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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 LIBTRANSMISSION_PEER_MODULE
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#error only the libtransmission peer module should #include this header.
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#endif
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#include <cstddef> // size_t
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#include <functional>
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#include <memory>
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#include <vector>
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#include "libtransmission/transmission.h"
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#include "libtransmission/observable.h"
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#include "libtransmission/utils.h"
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class tr_bitfield;
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/**
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* Figures out what blocks we want to request next.
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*/
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class Wishlist
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{
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public:
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static auto constexpr EndgameMaxPeers = size_t{ 2U };
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static auto constexpr NormalMaxPeers = size_t{ 1U };
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struct Mediator
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{
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[[nodiscard]] virtual bool client_has_block(tr_block_index_t block) const = 0;
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[[nodiscard]] virtual bool client_wants_piece(tr_piece_index_t piece) const = 0;
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[[nodiscard]] virtual bool is_endgame() const = 0;
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[[nodiscard]] virtual bool is_sequential_download() const = 0;
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[[nodiscard]] virtual size_t count_active_requests(tr_block_index_t block) const = 0;
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[[nodiscard]] virtual size_t count_missing_blocks(tr_piece_index_t piece) const = 0;
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[[nodiscard]] virtual size_t count_piece_replication(tr_piece_index_t piece) const = 0;
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[[nodiscard]] virtual tr_block_span_t block_span(tr_piece_index_t piece) const = 0;
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[[nodiscard]] virtual tr_piece_index_t piece_count() const = 0;
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[[nodiscard]] virtual tr_priority_t priority(tr_piece_index_t piece) const = 0;
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[[nodiscard]] virtual libtransmission::ObserverTag observe_peer_disconnect(
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libtransmission::SimpleObservable<tr_torrent*, tr_bitfield const&>::Observer observer) = 0;
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[[nodiscard]] virtual libtransmission::ObserverTag observe_got_bitfield(
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libtransmission::SimpleObservable<tr_torrent*, tr_bitfield const&>::Observer observer) = 0;
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[[nodiscard]] virtual libtransmission::ObserverTag observe_got_block(
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libtransmission::SimpleObservable<tr_torrent*, tr_piece_index_t, tr_block_index_t>::Observer observer) = 0;
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[[nodiscard]] virtual libtransmission::ObserverTag observe_got_have(
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libtransmission::SimpleObservable<tr_torrent*, tr_piece_index_t>::Observer observer) = 0;
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[[nodiscard]] virtual libtransmission::ObserverTag observe_got_have_all(
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libtransmission::SimpleObservable<tr_torrent*>::Observer observer) = 0;
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[[nodiscard]] virtual libtransmission::ObserverTag observe_piece_completed(
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libtransmission::SimpleObservable<tr_torrent*, tr_piece_index_t>::Observer observer) = 0;
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[[nodiscard]] virtual libtransmission::ObserverTag observe_priority_changed(
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libtransmission::SimpleObservable<tr_torrent*, tr_file_index_t const*, tr_file_index_t, tr_priority_t>::Observer
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observer) = 0;
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[[nodiscard]] virtual libtransmission::ObserverTag observe_sequential_download_changed(
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libtransmission::SimpleObservable<tr_torrent*, bool>::Observer observer) = 0;
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virtual ~Mediator() = default;
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};
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explicit Wishlist(std::unique_ptr<Mediator> mediator_in);
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~Wishlist();
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// the next blocks that we should request from a peer
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[[nodiscard]] std::vector<tr_block_span_t> next(
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size_t n_wanted_blocks,
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std::function<bool(tr_piece_index_t)> const& peer_has_piece,
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std::function<bool(tr_block_index_t)> const& has_active_pending_to_peer);
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private:
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class Impl;
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std::unique_ptr<Impl> impl_;
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};
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