premiere-libtorrent/include/libtorrent/peer_info.hpp

/*

Copyright (c) 2003-2012, Arvid Norberg
All rights reserved.

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modification, are permitted provided that the following conditions
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      from this software without specific prior written permission.

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*/

#ifndef TORRENT_PEER_INFO_HPP_INCLUDED
#define TORRENT_PEER_INFO_HPP_INCLUDED

#include "libtorrent/socket.hpp"
#include "libtorrent/deadline_timer.hpp"
#include "libtorrent/peer_id.hpp"
#include "libtorrent/size_type.hpp"
#include "libtorrent/config.hpp"
#include "libtorrent/bitfield.hpp"

namespace libtorrent
{
	struct TORRENT_EXPORT peer_info
	{
		enum peer_flags_t
		{
			// **we** are interested in pieces from this peer.
			interesting = 0x1,

			// **we** have choked this peer.
			choked = 0x2,

			// the peer is interested in **us**
			remote_interested = 0x4,

			// the peer has choked **us**.
			remote_choked = 0x8,

			// means that this peer supports the
			// `extension protocol`__.          
			// 
			// __ extension_protocol.html
			supports_extensions = 0x10,

			// The connection was initiated by us, the peer has a   
			// listen port open, and that port is the same as in the
			// address of this peer. If this flag is not set, this  
			// peer connection was opened by this peer connecting to
			// us.                                                  
			local_connection = 0x20,

			// The connection is opened, and waiting for the        
			// handshake. Until the handshake is done, the peer     
			// cannot be identified.                                
			handshake = 0x40,

			// The connection is in a half-open state (i.e. it is   
			// being connected).                                    
			connecting = 0x80,

			// The connection is currently queued for a connection  
			// attempt. This may happen if there is a limit set on  
			// the number of half-open TCP connections.             
			queued = 0x100,

			// The peer has participated in a piece that failed the 
			// hash check, and is now "on parole", which means we're
			// only requesting whole pieces from this peer until    
			// it either fails that piece or proves that it doesn't 
			// send bad data.                                       
			on_parole = 0x200,

			// This peer is a seed (it has all the pieces).         
			seed = 0x400,

			// This peer is subject to an optimistic unchoke. It has
			// been unchoked for a while to see if it might unchoke 
			// us in return an earn an upload/unchoke slot. If it   
			// doesn't within some period of time, it will be choked
			// and another peer will be optimistically unchoked.    
			optimistic_unchoke = 0x800,

			// This peer has recently failed to send a block within 
			// the request timeout from when the request was sent.  
			// We're currently picking one block at a time from this
			// peer.                                                
			snubbed = 0x1000,

			// This peer has either explicitly (with an extension)  
			// or implicitly (by becoming a seed) told us that it   
			// will not downloading anything more, regardless of    
			// which pieces we have.                                
			upload_only = 0x2000,

			// This means the last time this peer picket a piece,   
			// it could not pick as many as it wanted because there 
			// were not enough free ones. i.e. all pieces this peer 
			// has were already requested from other peers.         
			endgame_mode = 0x4000,

			// This flag is set if the peer was in holepunch mode   
			// when the connection succeeded. This typically only   
			// happens if both peers are behind a NAT and the peers 
			// connect via the NAT holepunch mechanism.             
			holepunched = 0x8000,

			i2p_socket = 0x10000,
			utp_socket = 0x20000,
			rc4_encrypted = 0x100000,
			plaintext_encrypted = 0x200000
		};

		// tells you in which state the peer is in. It is set to
		// any combination of the peer_flags_t enum.
		unsigned int flags;

		enum peer_source_flags
		{
			// The peer was received from the tracker.
			tracker = 0x1,

			// The peer was received from the kademlia DHT.
			dht = 0x2,

			// The peer was received from the peer exchange
			// extension.
			pex = 0x4,

			// The peer was received from the local service
			// discovery (The peer is on the local network).
			lsd = 0x8,

			// The peer was added from the fast resume data.
			resume_data = 0x10,
			
			// we received an incoming connection from this peer
			incoming = 0x20
		};

		// a combination of flags describing from which sources this peer
		// was received.
		int source;

		// bits for the read_state and write_state
		enum bw_state
		{
			// The peer is not waiting for any external events to   
			// send or receive data.
			bw_idle = 0,

			// The peer is waiting for the rate limiter.
			bw_limit = 1,

			// The peer has quota and is currently waiting for a
			// network read or write operation to complete. This is
			// the state all peers are in if there are no bandwidth
			// limits.
			bw_network = 2,

			// The peer is waiting for the disk I/O thread to catch
			// up writing buffers to disk before downloading more.
			bw_disk = 4
		};
#ifndef TORRENT_NO_DEPRECATE
		enum bw_state_deprecated { bw_torrent = bw_limit, bw_global = bw_limit };
#endif

		// bitmasks indicating what state this peer
		// is in with regards to sending and receiving data. The states are declared in the
		// bw_state enum.
		char read_state;
		char write_state;
		
		// the IP-address to this peer. The type is an asio endpoint. For
		// more info, see the asio_ documentation.
		//
		// .. _asio: http://asio.sourceforge.net/asio-0.3.8/doc/asio/reference.html
		tcp::endpoint ip;

		// the current upload and download speed
		// we have to and from this peer (including any protocol messages).
		// updated about once per second
		int up_speed;
		int down_speed;

		// The transfer rates
		// of payload data only 
		// updated about once per second
		int payload_up_speed;
		int payload_down_speed;

		// the total number of bytes downloaded
		// from and uploaded to this peer. These numbers do not include the protocol chatter, but only
		// the payload data.
		size_type total_download;
		size_type total_upload;

		// the peer's id as used in the bit torrent protocol. This id can be used to
		// extract 'fingerprints' from the peer. Sometimes it can tell you which client the peer
		// is using. See identify_client()_
		peer_id pid;

		// a bitfield, with one bit per piece in the torrent.
		// Each bit tells you if the peer has that piece (if it's set to 1)
		// or if the peer miss that piece (set to 0).
		bitfield pieces;

		// the number of bytes per second we are allowed to send to or receive from this
		// peer. It may be -1 if there's no local limit on the peer. The global
		// limit and the torrent limit may also be enforced.
		int upload_limit;
		int download_limit;

		// the time since we last sent a request
		// to this peer and since any transfer occurred with this peer
		time_duration last_request;
		time_duration last_active;

		// the time until all blocks in the request
		// queue will be d
		time_duration download_queue_time;
		int queue_bytes;

		// the number of seconds until the current front piece request
		// will time out. This timeout can be adjusted through ``session_settings::request_timeout``.
		// -1 means that there is not outstanding request.
		int request_timeout;

		// the number of bytes allocated
		// and used for the peer's send buffer, respectively.
		int send_buffer_size;
		int used_send_buffer;

		// the number of bytes
		// allocated and used as receive buffer, respectively.
		int receive_buffer_size;
		int used_receive_buffer;

		// the number of pieces this peer has participated in
		// sending us that turned out to fail the hash check.
		int num_hashfails;

		// the two letter `ISO 3166 country code`__ for the country the peer
		// is connected from. If the country hasn't been resolved yet, both chars are set
		// to 0. If the resolution failed for some reason, the field is set to "--". If the
		// resolution service returns an invalid country code, it is set to "!!".
		// The ``countries.nerd.dk`` service is used to look up countries. This field will
		// remain set to 0 unless the torrent is set to resolve countries, see `resolve_countries()`_.
		// 
		// __ http://www.iso.org/iso/en/prods-services/iso3166ma/02iso-3166-code-lists/list-en1.html
		char country[2];

#ifndef TORRENT_DISABLE_GEO_IP
		// the name of the AS this peer is located in. This might be
		// an empty string if there is no name in the geo ip database.
		std::string inet_as_name;

		// the AS number the peer is located in.
		int inet_as;
#endif

		// a measurement of the balancing of free download (that we get)
		// and free upload that we give. Every peer gets a certain amount of free upload, but
		// this member says how much *extra* free upload this peer has got. If it is a negative
		// number it means that this was a peer from which we have got this amount of free
		// download.
		size_type load_balancing;

		// this is the number of requests
		// we have sent to this peer
		// that we haven't got a response
		// for yet
		int download_queue_length;
		
		// the number of block requests that have
		// timed out, and are still in the download
		// queue
		int timed_out_requests;

		// the number of busy requests in the download
		// queue. A budy request is a request for a block
		// we've also requested from a different peer
		int busy_requests;

		// the number of requests messages that are currently in the
		// send buffer waiting to be sent.
		int requests_in_buffer;

		// the number of requests that is
		// tried to be maintained (this is
		// typically a function of download speed)
		int target_dl_queue_length;

		// the number of piece-requests we have received from this peer
		// that we haven't answered with a piece yet.
		int upload_queue_length;

		// the number of times this peer has "failed". i.e. failed to connect
		// or disconnected us. The failcount is decremented when we see this peer in a tracker
		// response or peer exchange message.
		int failcount;

		// You can know which piece, and which part of that piece, that is currently being
		// downloaded from a specific peer by looking at these four members.
		// ``downloading_piece_index`` is the index of the piece that is currently being downloaded.
		// This may be set to -1 if there's currently no piece downloading from this peer. If it is
		// >= 0, the other three members are valid. ``downloading_block_index`` is the index of the
		// block (or sub-piece) that is being downloaded. ``downloading_progress`` is the number
		// of bytes of this block we have received from the peer, and ``downloading_total`` is
		// the total number of bytes in this block.
		int downloading_piece_index;
		int downloading_block_index;
		int downloading_progress;
		int downloading_total;
	
		// a string describing the software at the other end of the connection.
		// In some cases this information is not available, then it will contain a string
		// that may give away something about which software is running in the other end.
		// In the case of a web seed, the server type and version will be a part of this
		// string.
		std::string client;
		
		enum connection_type_t
		{
			// Regular bittorrent connection over TCP
			standard_bittorrent = 0,

			// Bittorrent connection over uTP
			web_seed = 1,

			// HTTP connection using the `BEP 19`_ protocol
			http_seed = 2,

			// HTTP connection using the `BEP 17`_ protocol
			bittorrent_utp = 3
		};

		// the kind of connection this peer uses. See connection_type_t.
		int connection_type;
		
		// an estimate of the rate this peer is downloading at, in
		// bytes per second.
		int remote_dl_rate;

		// the number of bytes this peer has pending in the
		// disk-io thread. Downloaded and waiting to be written to disk. This is what
		// is capped by ``session_settings::max_queued_disk_bytes``.
		int pending_disk_bytes;

		// the number of bytes this peer has been
		// assigned to be allowed to send and receive until it has to request more quota
		// from the bandwidth manager.
		int send_quota;
		int receive_quota;

		// an estimated round trip time to this peer, in milliseconds. It is
		// estimated by timing the the tcp ``connect()``. It may be 0 for incoming connections.
		int rtt;

		// the number of pieces this peer has.
		int num_pieces;

		// the highest download and upload
		// rates seen on this connection. They are given in bytes per second. This number is
		// reset to 0 on reconnect.
		int download_rate_peak;
		int upload_rate_peak;
		
		// the progress of the peer in the range [0, 1]. This is always 0 when
		// floating point operations are diabled, instead use ``progress_ppm``.
		float progress; // [0, 1]

		// indicates the download progress of the peer in the range [0, 1000000]
		// (parts per million).
		int progress_ppm;

		int estimated_reciprocation_rate;

		// the IP and port pair the socket is bound to locally. i.e. the IP
		// address of the interface it's going out over. This may be useful for multi-homed
		// clients with multiple interfaces to the internet.
		tcp::endpoint local_endpoint;
	};

	struct TORRENT_EXPORT peer_list_entry
	{
		enum flags_t
		{
			banned = 1
		};
		
		tcp::endpoint ip;
		int flags;
		boost::uint8_t failcount;
		boost::uint8_t source;
	};

	// defined in policy.cpp
	int source_rank(int source_bitmask);
}

#endif // TORRENT_PEER_INFO_HPP_INCLUDED