551 lines
16 KiB
C++
Executable File
551 lines
16 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_TORRENT_HPP_INCLUDE
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#define TORRENT_TORRENT_HPP_INCLUDE
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#include <algorithm>
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#include <vector>
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#include <set>
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#include <list>
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#include <iostream>
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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/limits.hpp>
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#include <boost/filesystem/path.hpp>
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#include <boost/date_time/posix_time/posix_time.hpp>
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#include <boost/tuple/tuple.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/torrent_handle.hpp"
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#include "libtorrent/entry.hpp"
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#include "libtorrent/torrent_info.hpp"
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#include "libtorrent/socket.hpp"
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#include "libtorrent/policy.hpp"
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#include "libtorrent/tracker_manager.hpp"
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#include "libtorrent/stat.hpp"
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#include "libtorrent/alert.hpp"
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#include "libtorrent/resource_request.hpp"
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namespace libtorrent
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{
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#ifdef TORRENT_VERBOSE_LOGGING
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struct logger;
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#endif
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class piece_manager;
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std::string escape_string(const char* str, int len);
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std::string unescape_string(std::string const& s);
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namespace detail
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{
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struct session_impl;
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struct piece_checker_data;
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}
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int div_round_up(int numerator, int denominator);
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std::pair<int, int> req_to_offset(std::pair<int, int> req, int total_size);
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std::pair<int, int> offset_to_req(std::pair<int, int> offset, int total_size);
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// a torrent is a class that holds information
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// for a specific download. It updates itself against
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// the tracker
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class torrent: public request_callback
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{
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public:
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torrent(
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detail::session_impl& ses
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, entry const& metadata
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, boost::filesystem::path const& save_path
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, address const& net_interface
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, bool compact_mode);
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// used with metadata-less torrents
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// (the metadata is downloaded from the peers)
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torrent(
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detail::session_impl& ses
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, char const* tracker_url
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, sha1_hash const& info_hash
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, boost::filesystem::path const& save_path
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, address const& net_interface
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, bool compact_mode);
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~torrent();
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// this is called when the torrent has metadata.
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// it will initialize the storage and the piece-picker
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void init();
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// this will flag the torrent as aborted. The main
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// loop in session_impl will check for this state
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// on all torrents once every second, and take
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// the necessary actions then.
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void abort();
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bool is_aborted() const { return m_abort; }
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// is called every second by session. This will
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// caclulate the upload/download and number
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// of connections this torrent needs. And prepare
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// it for being used by allocate_resources.
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void second_tick(stat& accumulator);
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// debug purpose only
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void print(std::ostream& os) const;
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// this is called from the peer_connection for
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// each piece of metadata it receives
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void metadata_progress(int total_size, int received);
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void check_files(
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detail::piece_checker_data& data
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, boost::mutex& mutex, bool lock_session = true);
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stat statistics() const { return m_stat; }
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size_type bytes_left() const;
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boost::tuple<size_type, size_type> bytes_done() const;
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void pause();
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void resume();
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bool is_paused() const { return m_paused; }
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void filter_piece(int index, bool download);
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bool is_piece_filtered(int index) const;
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void filtered_pieces(std::vector<bool>& bitmask) const;
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torrent_status status() const;
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void use_interface(const char* net_interface);
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peer_connection& connect_to_peer(const address& a);
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void set_ratio(float ratio)
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{ assert(ratio >= 0.0f); m_ratio = ratio; }
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float ratio() const
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{ return m_ratio; }
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// --------------------------------------------
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// PEER MANAGEMENT
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// used by peer_connection to attach itself to a torrent
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// since incoming connections don't know what torrent
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// they're a part of until they have received an info_hash.
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void attach_peer(peer_connection* p);
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// this will remove the peer and make sure all
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// the pieces it had have their reference counter
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// decreased in the piece_picker
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// called from the peer_connection destructor
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void remove_peer(peer_connection* p);
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peer_connection* connection_for(const address& a)
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{
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peer_iterator i = m_connections.find(a);
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if (i == m_connections.end()) return 0;
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return i->second;
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}
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// the number of peers that belong to this torrent
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int num_peers() const { return (int)m_connections.size(); }
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int num_seeds() const;
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typedef std::map<address, peer_connection*>::iterator peer_iterator;
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typedef std::map<address, peer_connection*>::const_iterator const_peer_iterator;
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const_peer_iterator begin() const { return m_connections.begin(); }
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const_peer_iterator end() const { return m_connections.end(); }
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peer_iterator begin() { return m_connections.begin(); }
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peer_iterator end() { return m_connections.end(); }
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// --------------------------------------------
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// TRACKER MANAGEMENT
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// these are callbacks called by the tracker_connection instance
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// (either http_tracker_connection or udp_tracker_connection)
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// when this torrent got a response from its tracker request
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// or when a failure occured
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virtual void tracker_response(
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tracker_request const& r
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, std::vector<peer_entry>& e, int interval
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, int complete, int incomplete);
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virtual void tracker_request_timed_out(
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tracker_request const& r);
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virtual void tracker_request_error(tracker_request const& r
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, int response_code, const std::string& str);
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// generates a request string for sending
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// to the tracker
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tracker_request generate_tracker_request();
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// if no password and username is set
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// this will return an empty string, otherwise
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// it will concatenate the login and password
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// ready to be sent over http (but without
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// base64 encoding).
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std::string tracker_login() const;
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// returns the absolute time when the next tracker
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// announce will take place.
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boost::posix_time::ptime next_announce() const;
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// returns true if it is time for this torrent to make another
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// tracker request
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bool should_request();
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// forcefully sets next_announce to the current time
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void force_tracker_request();
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void force_tracker_request(boost::posix_time::ptime);
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// sets the username and password that will be sent to
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// the tracker
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void set_tracker_login(std::string const& name, std::string const& pw);
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// the address of the tracker that we managed to
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// announce ourself at the last time we tried to announce
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const address& current_tracker() const;
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// --------------------------------------------
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// PIECE MANAGEMENT
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// returns true if we have downloaded the given piece
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bool have_piece(int index) const
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{
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assert(index >= 0 && index < (signed)m_have_pieces.size());
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return m_have_pieces[index];
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}
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const std::vector<bool>& pieces() const
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{ return m_have_pieces; }
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int num_pieces() const { return m_num_pieces; }
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// when we get a have- or bitfield- messages, this is called for every
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// piece a peer has gained.
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void peer_has(int index)
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{
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assert(m_picker.get());
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assert(index >= 0 && index < (signed)m_have_pieces.size());
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m_picker->inc_refcount(index);
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}
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// when peer disconnects, this is called for every piece it had
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void peer_lost(int index)
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{
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assert(m_picker.get());
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assert(index >= 0 && index < (signed)m_have_pieces.size());
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m_picker->dec_refcount(index);
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}
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int block_size() const { return m_block_size; }
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// this will tell all peers that we just got his piece
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// and also let the piece picker know that we have this piece
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// so it wont pick it for download
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void announce_piece(int index);
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void disconnect_all();
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// this is called wheh the torrent has completed
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// the download. It will post an event, disconnect
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// all seeds and let the tracker know we're finished.
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void completed();
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// this is called when the torrent has finished. i.e.
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// all the pieces we have not filtered have been downloaded.
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// If no pieces are filtered, this is called first and then
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// completed() is called immediately after it.
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void finished();
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bool verify_piece(int piece_index);
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// this is called from the peer_connection
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// each time a piece has failed the hash
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// test
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void piece_failed(int index);
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float priority() const
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{ return m_priority; }
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void set_priority(float p)
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{
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assert(p >= 0.f && p <= 1.f);
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m_priority = p;
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}
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bool is_seed() const
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{
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return valid_metadata()
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&& m_num_pieces == m_torrent_file.num_pieces();
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}
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boost::filesystem::path save_path() const;
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alert_manager& alerts() const;
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piece_picker& picker()
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{
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assert(m_picker.get());
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return *m_picker;
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}
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policy& get_policy() { return *m_policy; }
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piece_manager& filesystem();
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torrent_info const& torrent_file() const { return m_torrent_file; }
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std::vector<announce_entry> const& trackers() const
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{ return m_trackers; }
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void replace_trackers(std::vector<announce_entry> const& urls);
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torrent_handle get_handle() const;
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// LOGGING
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#ifdef TORRENT_VERBOSE_LOGGING
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logger* spawn_logger(const char* title);
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virtual void debug_log(const std::string& line);
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#endif
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// DEBUG
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#ifndef NDEBUG
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void check_invariant() const;
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#endif
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// --------------------------------------------
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// RESOURCE MANAGEMENT
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// this will distribute the given upload/download
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// quotas and number of connections, among the peers
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void distribute_resources();
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resource_request m_ul_bandwidth_quota;
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resource_request m_dl_bandwidth_quota;
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resource_request m_uploads_quota;
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resource_request m_connections_quota;
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void set_upload_limit(int limit);
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void set_download_limit(int limit);
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void set_max_uploads(int limit);
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void set_max_connections(int limit);
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bool move_storage(boost::filesystem::path const& save_path);
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bool valid_metadata() const { return m_storage.get() != 0; }
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std::vector<char> const& metadata() const { return m_metadata; }
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bool received_metadata(
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char const* buf
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, int size
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, int offset
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, int total_size);
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// returns a range of the metadata that
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// we should request.
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std::pair<int, int> metadata_request();
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void cancel_metadata_request(std::pair<int, int> req);
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private:
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void try_next_tracker();
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int prioritize_tracker(int tracker_index);
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torrent_info m_torrent_file;
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// is set to true when the torrent has
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// been aborted.
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bool m_abort;
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// is true if this torrent has been paused
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bool m_paused;
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// this is true from the time when the torrent was
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// paused to the time should_request() is called
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bool m_just_paused;
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tracker_request::event_t m_event;
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void parse_response(const entry& e, std::vector<peer_entry>& peer_list);
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// the size of a request block
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// each piece is divided into these
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// blocks when requested
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int m_block_size;
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// if this pointer is 0, the torrent is in
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// a state where the metadata hasn't been
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// received yet.
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std::auto_ptr<piece_manager> m_storage;
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// the time of next tracker request
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boost::posix_time::ptime m_next_request;
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// -----------------------------
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// DATA FROM TRACKER RESPONSE
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// the number number of seconds between requests
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// from the tracker
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int m_duration;
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// the scrape data from the tracker response, this
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// is optional and may be -1.
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int m_complete;
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int m_incomplete;
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std::map<address, peer_connection*> m_connections;
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// this is the upload and download statistics for the whole torrent.
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// it's updated from all its peers once every second.
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libtorrent::stat m_stat;
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// -----------------------------
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boost::shared_ptr<policy> m_policy;
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// a back reference to the session
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// this torrent belongs to.
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detail::session_impl& m_ses;
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std::auto_ptr<piece_picker> m_picker;
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std::vector<announce_entry> m_trackers;
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// this is an index into m_torrent_file.trackers()
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int m_last_working_tracker;
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int m_currently_trying_tracker;
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// the number of connection attempts that has
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// failed in a row, this is currently used to
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// determine the timeout until next try.
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int m_failed_trackers;
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// this is a counter that is increased every
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// second, and when it reaches 10, the policy::pulse()
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// is called and the time scaler is reset to 0.
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int m_time_scaler;
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// this is the priority of this torrent. It is used
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// to weight the assigned upload bandwidth between peers
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// it should be within the range [0, 1]
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float m_priority;
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// the bitmask that says which pieces we have
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std::vector<bool> m_have_pieces;
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// the number of pieces we have. The same as
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// std::accumulate(m_have_pieces.begin(),
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// m_have_pieces.end(), 0)
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int m_num_pieces;
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// is false by default and set to
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// true when the first tracker reponse
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// is received
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bool m_got_tracker_response;
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// the upload/download ratio that each peer
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// tries to maintain.
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// 0 is infinite
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float m_ratio;
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// the number of bytes that has been
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// downloaded that failed the hash-test
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size_type m_total_failed_bytes;
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std::string m_username;
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std::string m_password;
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// the network interface all outgoing connections
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// are opened through
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address m_net_interface;
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// the max number of bytes this torrent
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// can upload per second
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int m_upload_bandwidth_limit;
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int m_download_bandwidth_limit;
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// this buffer is filled with the info-section of
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// the metadata file while downloading it from
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// peers, and while sending it.
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std::vector<char> m_metadata;
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// this is a bitfield of size 256, each bit represents
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// a piece of the metadata. It is set to one if we
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// have that piece. This vector may be empty
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// (size 0) if we haven't received any metadata
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// or if we already have all metadata
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std::vector<bool> m_have_metadata;
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// this vector keeps track of how many times each meatdata
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// block has been requested
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std::vector<int> m_requested_metadata;
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boost::filesystem::path m_save_path;
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// determines the storage state for this torrent.
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const bool m_compact_mode;
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int m_metadata_progress;
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int m_metadata_size;
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};
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inline boost::posix_time::ptime torrent::next_announce() const
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{
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return m_next_request;
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}
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inline void torrent::force_tracker_request()
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{
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using boost::posix_time::second_clock;
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m_next_request = second_clock::universal_time();
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}
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inline void torrent::force_tracker_request(boost::posix_time::ptime t)
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{
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namespace time = boost::posix_time;
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m_next_request = t;
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}
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inline void torrent::set_tracker_login(
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std::string const& name
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, std::string const& pw)
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{
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m_username = name;
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m_password = pw;
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}
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}
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#endif // TORRENT_TORRENT_HPP_INCLUDED
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