transmission/libtransmission/peer-common.h

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// This file Copyright © 2008-2023 Mnemosyne LLC.
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// 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 <array>
#include <cstddef> // size_t
#include <cstdint> // uint8_t, uint32_t, uint64_t
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#include <string>
#include "libtransmission/transmission.h"
#include "libtransmission/bitfield.h"
#include "libtransmission/block-info.h"
#include "libtransmission/history.h"
#include "libtransmission/net.h" // tr_port
/**
* @addtogroup peers Peers
* @{
*/
class tr_peer;
class tr_swarm;
struct tr_bandwidth;
// --- Peer Publish / Subscribe
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class tr_peer_event
{
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public:
enum class Type
{
// Unless otherwise specified, all events are for BT peers only
ClientGotBlock, // applies to webseed too
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ClientGotChoke,
ClientGotPieceData, // applies to webseed too
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ClientGotAllowedFast,
ClientGotSuggest,
ClientGotPort,
ClientGotRej, // applies to webseed too
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ClientGotBitfield,
ClientGotHave,
ClientGotHaveAll,
ClientGotHaveNone,
ClientSentPieceData,
Error // generic
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};
Type type = Type::Error;
tr_bitfield* bitfield = nullptr; // for GotBitfield
uint32_t pieceIndex = 0; // for GotBlock, GotHave, Cancel, Allowed, Suggest
uint32_t offset = 0; // for GotBlock
uint32_t length = 0; // for GotBlock, GotPieceData
int err = 0; // errno for GotError
tr_port port = {}; // for GotPort
[[nodiscard]] constexpr static auto GotBlock(tr_block_info const& block_info, tr_block_index_t block) noexcept
{
auto const loc = block_info.block_loc(block);
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auto event = tr_peer_event{};
event.type = Type::ClientGotBlock;
event.pieceIndex = loc.piece;
event.offset = loc.piece_offset;
event.length = block_info.block_size(block);
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return event;
}
[[nodiscard]] constexpr static auto GotAllowedFast(tr_piece_index_t piece) noexcept
{
auto event = tr_peer_event{};
event.type = Type::ClientGotAllowedFast;
event.pieceIndex = piece;
return event;
}
[[nodiscard]] constexpr static auto GotBitfield(tr_bitfield* bitfield) noexcept
{
auto event = tr_peer_event{};
event.type = Type::ClientGotBitfield;
event.bitfield = bitfield;
return event;
}
[[nodiscard]] constexpr static auto GotChoke() noexcept
{
auto event = tr_peer_event{};
event.type = Type::ClientGotChoke;
return event;
}
[[nodiscard]] constexpr static auto GotError(int err) noexcept
{
auto event = tr_peer_event{};
event.type = Type::Error;
event.err = err;
return event;
}
[[nodiscard]] constexpr static auto GotHave(tr_piece_index_t piece) noexcept
{
auto event = tr_peer_event{};
event.type = Type::ClientGotHave;
event.pieceIndex = piece;
return event;
}
[[nodiscard]] constexpr static auto GotHaveAll() noexcept
{
auto event = tr_peer_event{};
event.type = Type::ClientGotHaveAll;
return event;
}
[[nodiscard]] constexpr static auto GotHaveNone() noexcept
{
auto event = tr_peer_event{};
event.type = Type::ClientGotHaveNone;
return event;
}
[[nodiscard]] constexpr static auto GotPieceData(uint32_t length) noexcept
{
auto event = tr_peer_event{};
event.type = Type::ClientGotPieceData;
event.length = length;
return event;
}
[[nodiscard]] constexpr static auto GotPort(tr_port port) noexcept
{
auto event = tr_peer_event{};
event.type = Type::ClientGotPort;
event.port = port;
return event;
}
[[nodiscard]] constexpr static auto GotRejected(tr_block_info const& block_info, tr_block_index_t block) noexcept
{
auto const loc = block_info.block_loc(block);
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auto event = tr_peer_event{};
event.type = Type::ClientGotRej;
event.pieceIndex = loc.piece;
event.offset = loc.piece_offset;
event.length = block_info.block_size(block);
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return event;
}
[[nodiscard]] constexpr static auto GotSuggest(tr_piece_index_t piece) noexcept
{
auto event = tr_peer_event{};
event.type = Type::ClientGotSuggest;
event.pieceIndex = piece;
return event;
}
[[nodiscard]] constexpr static auto SentPieceData(uint32_t length) noexcept
{
auto event = tr_peer_event{};
event.type = Type::ClientSentPieceData;
event.length = length;
return event;
}
};
using tr_peer_callback_generic = void (*)(tr_peer* peer, tr_peer_event const& event, void* client_data);
/**
* State information about a connected peer.
*
* @see tr_peer_info
* @see tr_peerMsgs
*/
class tr_peer
{
public:
tr_peer(tr_torrent const* tor);
virtual ~tr_peer();
virtual bool isTransferringPieces(uint64_t now, tr_direction dir, tr_bytes_per_second_t* setme_bytes_per_second) const = 0;
[[nodiscard]] bool hasPiece(tr_piece_index_t piece) const noexcept
{
return has().test(piece);
}
[[nodiscard]] float percentDone() const noexcept
{
return has().percent();
}
[[nodiscard]] bool isSeed() const noexcept
{
return has().has_all();
}
[[nodiscard]] virtual std::string display_name() const = 0;
[[nodiscard]] virtual tr_bitfield const& has() const noexcept = 0;
// requests that have been made but haven't been fulfilled yet
[[nodiscard]] virtual size_t activeReqCount(tr_direction) const noexcept = 0;
[[nodiscard]] tr_bytes_per_second_t get_piece_speed_bytes_per_second(uint64_t now, tr_direction direction) const
{
auto bytes_per_second = tr_bytes_per_second_t{};
isTransferringPieces(now, direction, &bytes_per_second);
return bytes_per_second;
}
virtual void requestBlocks(tr_block_span_t const* block_spans, size_t n_spans) = 0;
struct RequestLimit
{
// How many blocks we could request.
size_t max_spans = 0;
// How many spans those blocks could be in.
// This is for webseeds, which make parallel requests.
size_t max_blocks = 0;
};
// how many blocks could we request from this peer right now?
[[nodiscard]] virtual RequestLimit canRequest() const noexcept = 0;
tr_session* const session;
tr_swarm* const swarm;
tr_recentHistory<uint16_t> blocks_sent_to_peer;
tr_recentHistory<uint16_t> cancels_sent_to_client;
/// The following fields are only to be used in peer-mgr.cc.
/// TODO(ckerr): refactor them out of `tr_peer`
// whether or not this peer sent us any given block
tr_bitfield blame;
// whether or not we should free this peer soon.
bool do_purge = false;
// how many bad pieces this piece has contributed to
uint8_t strikes = 0;
// how many blocks this peer has sent us
tr_recentHistory<uint16_t> blocks_sent_to_client;
// how many requests we made to this peer and then canceled
tr_recentHistory<uint16_t> cancels_sent_to_peer;
};
// ---
struct tr_swarm_stats
{
std::array<uint16_t, 2> active_peer_count;
uint16_t active_webseed_count;
uint16_t peer_count;
std::array<uint16_t, TR_PEER_FROM__MAX> peer_from_count;
};
tr_swarm_stats tr_swarmGetStats(tr_swarm const* swarm);
// ---
#ifdef _WIN32
#undef EMSGSIZE
#define EMSGSIZE WSAEMSGSIZE
#endif
/** @} */