transmission/libtransmission/peer-common.h

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/*
* This file Copyright (C) 2008-2014 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
*/
#pragma once
#ifndef __TRANSMISSION__
#error only libtransmission should #include this header.
#endif
#include "transmission.h"
#include "bitfield.h"
#include "history.h"
#include "quark.h"
/**
* @addtogroup peers Peers
* @{
*/
class tr_peer;
class tr_swarm;
struct peer_atom;
/* This is the maximum size of a block request.
most bittorrent clients will reject requests
larger than this size. */
auto inline constexpr MAX_BLOCK_SIZE = 1024 * 16;
/**
*** 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 */
struct 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 is_transferring_pieces(uint64_t now, tr_direction direction, unsigned int* setme_Bps) const = 0;
/* whether or not we should free this peer soon.
NOTE: private to peer-mgr.c */
bool doPurge = false;
/* number of bad pieces they've contributed to */
uint8_t strikes = 0;
/* how many requests the peer has made that we haven't responded to yet */
int pendingReqsToClient = 0;
/* how many requests we've made and are currently awaiting a response for */
int pendingReqsToPeer = 0;
tr_session* const session;
/* Hook to private peer-mgr information */
peer_atom* const atom;
tr_swarm* const swarm;
/** how complete the peer's copy of the torrent is. [0.0...1.0] */
float progress = 0.0f;
struct tr_bitfield blame = {};
struct tr_bitfield have = {};
/* the client name.
For BitTorrent peers, this is the app name derived from the `v' string in LTEP's handshake dictionary */
tr_quark client = TR_KEY_NONE;
tr_recentHistory blocksSentToClient;
tr_recentHistory blocksSentToPeer;
tr_recentHistory cancelsSentToClient;
tr_recentHistory cancelsSentToPeer;
};
/** Update the tr_peer.progress field based on the 'have' bitset. */
void tr_peerUpdateProgress(tr_torrent* tor, tr_peer*);
bool tr_peerIsSeed(tr_peer const* peer);
/***
****
***/
struct tr_swarm_stats
{
int activePeerCount[2];
int activeWebseedCount;
int peerCount;
int peerFromCount[TR_PEER_FROM__MAX];
};
void tr_swarmGetStats(tr_swarm const* swarm, tr_swarm_stats* setme);
void tr_swarmIncrementActivePeers(tr_swarm* swarm, tr_direction direction, bool is_active);
/***
****
***/
#ifdef _WIN32
#undef EMSGSIZE
#define EMSGSIZE WSAEMSGSIZE
#endif
/** @} */