transmission/libtransmission/peer-common.h

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// This file Copyright © 2008-2022 Mnemosyne LLC.
2022-08-08 18:05:39 +00:00
// 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 <cstdint> // uint8_t, uint32_t, uint64_t
#include "transmission.h"
#include "bitfield.h"
#include "history.h"
#include "interned-string.h"
#include "net.h" // tr_port
/**
* @addtogroup peers Peers
* @{
*/
class tr_peer;
class tr_swarm;
struct peer_atom;
struct tr_bandwidth;
/**
*** Peer Publish / Subscribe
**/
enum PeerEventType
{
TR_PEER_CLIENT_GOT_BLOCK,
TR_PEER_CLIENT_GOT_CHOKE,
TR_PEER_CLIENT_GOT_PIECE_DATA,
TR_PEER_CLIENT_GOT_ALLOWED_FAST,
TR_PEER_CLIENT_GOT_SUGGEST,
TR_PEER_CLIENT_GOT_PORT,
TR_PEER_CLIENT_GOT_REJ,
TR_PEER_CLIENT_GOT_BITFIELD,
TR_PEER_CLIENT_GOT_HAVE,
TR_PEER_CLIENT_GOT_HAVE_ALL,
TR_PEER_CLIENT_GOT_HAVE_NONE,
TR_PEER_PEER_GOT_PIECE_DATA,
TR_PEER_ERROR
};
struct tr_peer_event
{
PeerEventType eventType;
uint32_t pieceIndex; /* for GOT_BLOCK, GOT_HAVE, CANCEL, ALLOWED, SUGGEST */
tr_bitfield* bitfield; /* for GOT_BITFIELD */
uint32_t offset; /* for GOT_BLOCK */
uint32_t length; /* for GOT_BLOCK + GOT_PIECE_DATA */
int err; /* errno for GOT_ERROR */
tr_port port; /* for GOT_PORT */
};
using tr_peer_callback = void (*)(tr_peer* peer, tr_peer_event const* event, void* client_data);
/**
* State information about a connected peer.
*
* @see struct peer_atom
* @see tr_peerMsgs
*/
class tr_peer
{
public:
tr_peer(tr_torrent const* tor, peer_atom* atom = nullptr);
virtual ~tr_peer();
virtual bool isTransferringPieces(uint64_t now, tr_direction direction, unsigned int* setme_Bps) const = 0;
[[nodiscard]] virtual std::string readable() const = 0;
[[nodiscard]] virtual bool hasPiece(tr_piece_index_t piece) const noexcept = 0;
[[nodiscard]] virtual tr_bandwidth& bandwidth() noexcept = 0;
// requests that have been made but haven't been fulfilled yet
[[nodiscard]] virtual size_t activeReqCount(tr_direction) const noexcept = 0;
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
// hook to private peer-mgr information
peer_atom* const atom;
// 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);
void tr_swarmIncrementActivePeers(tr_swarm* swarm, tr_direction direction, bool is_active);
/***
****
***/
#ifdef _WIN32
#undef EMSGSIZE
#define EMSGSIZE WSAEMSGSIZE
#endif
/** @} */