247 lines
6.7 KiB
C++
Executable File
247 lines
6.7 KiB
C++
Executable File
/*
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Copyright (c) 2003, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_POLICY_HPP_INCLUDED
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#define TORRENT_POLICY_HPP_INCLUDED
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#include <algorithm>
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#include <vector>
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#ifdef _MSC_VER
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#pragma warning(push, 1)
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#endif
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#include <boost/date_time/posix_time/posix_time.hpp>
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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#include "libtorrent/peer.hpp"
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#include "libtorrent/piece_picker.hpp"
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#include "libtorrent/socket.hpp"
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#include "libtorrent/size_type.hpp"
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#include "libtorrent/invariant_check.hpp"
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#include "libtorrent/config.hpp"
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namespace libtorrent
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{
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class torrent;
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class peer_connection;
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enum
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{
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// the limits of the download queue size
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min_request_queue = 2,
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// the amount of free upload allowed before
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// the peer is choked
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free_upload_amount = 4 * 16 * 1024
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};
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class TORRENT_EXPORT policy
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{
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public:
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policy(torrent* t);
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// this is called every 10 seconds to allow
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// for peer choking management
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void pulse();
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// this is called once for every peer we get from
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// the tracker
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void peer_from_tracker(const tcp::endpoint& remote, const peer_id& pid);
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// called when an incoming connection is accepted
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// return false if the connection closed
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void new_connection(peer_connection& c);
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// this is called if a peer timed-out or
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// forcefully closed the connection. This
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// will mark the connection as non-reconnectale
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void peer_failed(peer_connection const& c);
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// the given connection was just closed
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void connection_closed(const peer_connection& c);
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// is called when a peer is believed to have
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// sent invalid data
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void ban_peer(const peer_connection& c);
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// the peer has got at least one interesting piece
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void peer_is_interesting(peer_connection& c);
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void piece_finished(int index, bool successfully_verified);
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void block_finished(peer_connection& c, piece_block b);
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// the peer choked us
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void choked(peer_connection& c);
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// the peer unchoked us
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void unchoked(peer_connection& c);
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// the peer is interested in our pieces
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void interested(peer_connection& c);
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// the peer is not interested in our pieces
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void not_interested(peer_connection& c);
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#ifndef NDEBUG
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bool has_connection(const peer_connection* p);
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void check_invariant() const;
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#endif
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struct peer
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{
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enum connection_type { not_connectable,connectable };
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peer(const tcp::endpoint& ip, connection_type t);
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size_type total_download() const;
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size_type total_upload() const;
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// the ip/port pair this peer is or was connected on
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// if it was a remote (incoming) connection, type is
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// set thereafter. If it was a peer we got from the
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// tracker, type is set to local_connection.
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tcp::endpoint ip;
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connection_type type;
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// the time when this peer was optimistically unchoked
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// the last time.
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boost::posix_time::ptime last_optimistically_unchoked;
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// the time when the peer connected to us
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// or disconnected if it isn't connected right now
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boost::posix_time::ptime connected;
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// this is the accumulated amount of
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// uploaded and downloaded data to this
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// peer. It only accounts for what was
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// shared during the last connection to
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// this peer. i.e. These are only updated
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// when the connection is closed. For the
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// total amount of upload and download
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// we'll have to add thes figures with the
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// statistics from the peer_connection.
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size_type prev_amount_upload;
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size_type prev_amount_download;
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// is set to true if this peer has been banned
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bool banned;
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// if the peer is connected now, this
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// will refer to a valid peer_connection
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peer_connection* connection;
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};
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int num_peers() const
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{
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return m_num_peers;
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}
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int num_uploads() const
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{
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return m_num_unchoked;
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}
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typedef std::vector<peer>::iterator iterator;
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iterator begin_peer() { return m_peers.begin(); }
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iterator end_peer() { return m_peers.end(); }
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private:
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bool unchoke_one_peer();
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void choke_one_peer();
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peer* find_choke_candidate();
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peer* find_unchoke_candidate();
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// the seed prefix means that the
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// function is used while seeding.
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bool seed_unchoke_one_peer();
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void seed_choke_one_peer();
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peer* find_seed_choke_candidate();
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peer* find_seed_unchoke_candidate();
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bool connect_peer(peer *);
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bool connect_one_peer();
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bool disconnect_one_peer();
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peer* find_disconnect_candidate();
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peer* find_connect_candidate();
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// a functor that identifies peers that have disconnected and that
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// are too old for still being saved.
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struct old_disconnected_peer
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{
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bool operator()(const peer& p)
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{
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using namespace boost::posix_time;
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ptime not_tried_yet(boost::gregorian::date(1970,boost::gregorian::Jan,1));
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// this timeout has to be customizable!
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return p.connection == 0
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&& p.connected != not_tried_yet
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&& second_clock::universal_time() - p.connected > minutes(30);
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}
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};
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std::vector<peer> m_peers;
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int m_num_peers;
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torrent* m_torrent;
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// the number of unchoked peers
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// at any given time
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int m_num_unchoked;
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// free download we have got that hasn't
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// been distributed yet.
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size_type m_available_free_upload;
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// if there is a connection limit,
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// we disconnect one peer every minute in hope of
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// establishing a connection with a better peer
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boost::posix_time::ptime m_last_optimistic_disconnect;
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};
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}
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#endif // TORRENT_POLICY_HPP_INCLUDED
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