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premiere-libtorrent/src/session_impl.cpp

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/*
Copyright (c) 2006, Arvid Norberg, Magnus Jonsson
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the distribution.
* Neither the name of the author nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#include "libtorrent/pch.hpp"
#include <ctime>
#include <iostream>
#include <fstream>
#include <iomanip>
#include <iterator>
#include <algorithm>
#include <set>
#include <cctype>
#include <algorithm>
#ifdef _MSC_VER
#pragma warning(push, 1)
#endif
#include <boost/lexical_cast.hpp>
#include <boost/filesystem/convenience.hpp>
#include <boost/filesystem/exception.hpp>
#include <boost/limits.hpp>
#include <boost/bind.hpp>
#ifdef _MSC_VER
#pragma warning(pop)
#endif
#include "libtorrent/peer_id.hpp"
#include "libtorrent/torrent_info.hpp"
#include "libtorrent/tracker_manager.hpp"
#include "libtorrent/bencode.hpp"
#include "libtorrent/hasher.hpp"
#include "libtorrent/entry.hpp"
#include "libtorrent/session.hpp"
#include "libtorrent/fingerprint.hpp"
#include "libtorrent/entry.hpp"
#include "libtorrent/alert_types.hpp"
#include "libtorrent/invariant_check.hpp"
#include "libtorrent/file.hpp"
#include "libtorrent/allocate_resources.hpp"
#include "libtorrent/bt_peer_connection.hpp"
#include "libtorrent/ip_filter.hpp"
#include "libtorrent/socket.hpp"
#include "libtorrent/aux_/session_impl.hpp"
#include "libtorrent/kademlia/dht_tracker.hpp"
using boost::shared_ptr;
using boost::weak_ptr;
using boost::bind;
using boost::mutex;
using libtorrent::aux::session_impl;
namespace libtorrent { namespace detail
{
std::string generate_auth_string(std::string const& user
, std::string const& passwd)
{
if (user.empty()) return std::string();
return user + ":" + passwd;
}
} namespace aux {
// This is the checker thread
// it is looping in an infinite loop
// until the session is aborted. It will
// normally just block in a wait() call,
// waiting for a signal from session that
// there's a new torrent to check.
void checker_impl::operator()()
{
eh_initializer();
// if we're currently performing a full file check,
// this is the torrent being processed
boost::shared_ptr<piece_checker_data> processing;
boost::shared_ptr<piece_checker_data> t;
for (;;)
{
// temporary torrent used while checking fastresume data
try
{
t.reset();
{
boost::mutex::scoped_lock l(m_mutex);
INVARIANT_CHECK;
// if the job queue is empty and
// we shouldn't abort
// wait for a signal
while (m_torrents.empty() && !m_abort && !processing)
m_cond.wait(l);
if (m_abort)
{
// no lock is needed here, because the main thread
// has already been shut down by now
processing.reset();
t.reset();
std::for_each(m_torrents.begin(), m_torrents.end()
, boost::bind(&torrent::abort
, boost::bind(&shared_ptr<torrent>::get
, boost::bind(&piece_checker_data::torrent_ptr, _1))));
m_torrents.clear();
std::for_each(m_processing.begin(), m_processing.end()
, boost::bind(&torrent::abort
, boost::bind(&shared_ptr<torrent>::get
, boost::bind(&piece_checker_data::torrent_ptr, _1))));
m_processing.clear();
return;
}
if (!m_torrents.empty())
{
t = m_torrents.front();
if (t->abort)
{
// make sure the locking order is
// consistent to avoid dead locks
// we need to lock the session because closing
// torrents assume to have access to it
l.unlock();
session_impl::mutex_t::scoped_lock l2(m_ses.m_mutex);
l.lock();
t->torrent_ptr->abort();
m_torrents.pop_front();
continue;
}
}
}
if (t)
{
std::string error_msg;
t->parse_resume_data(t->resume_data, t->torrent_ptr->torrent_file()
, error_msg);
if (!error_msg.empty() && m_ses.m_alerts.should_post(alert::warning))
{
session_impl::mutex_t::scoped_lock l(m_ses.m_mutex);
m_ses.m_alerts.post_alert(fastresume_rejected_alert(
t->torrent_ptr->get_handle()
, error_msg));
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_ses.m_logger) << "fastresume data for "
<< t->torrent_ptr->torrent_file().name() << " rejected: "
<< error_msg << "\n";
#endif
}
// lock the session to add the new torrent
session_impl::mutex_t::scoped_lock l(m_ses.m_mutex);
mutex::scoped_lock l2(m_mutex);
// clear the resume data now that it has been used
// (the fast resume data is now parsed and stored in t)
t->resume_data = entry();
bool up_to_date = t->torrent_ptr->check_fastresume(*t);
if (up_to_date)
{
INVARIANT_CHECK;
assert(m_torrents.front() == t);
t->torrent_ptr->files_checked(t->unfinished_pieces);
m_torrents.pop_front();
// we cannot add the torrent if the session is aborted.
if (!m_ses.is_aborted())
{
m_ses.m_torrents.insert(std::make_pair(t->info_hash, t->torrent_ptr));
if (t->torrent_ptr->is_seed() && m_ses.m_alerts.should_post(alert::info))
{
m_ses.m_alerts.post_alert(torrent_finished_alert(
t->torrent_ptr->get_handle()
, "torrent is complete"));
}
peer_id id;
std::fill(id.begin(), id.end(), 0);
for (std::vector<tcp::endpoint>::const_iterator i = t->peers.begin();
i != t->peers.end(); ++i)
{
t->torrent_ptr->get_policy().peer_from_tracker(*i, id
, peer_info::resume_data, 0);
}
}
else
{
t->torrent_ptr->abort();
}
t.reset();
continue;
}
l.unlock();
// move the torrent from
// m_torrents to m_processing
assert(m_torrents.front() == t);
m_torrents.pop_front();
m_processing.push_back(t);
if (!processing)
{
processing = t;
processing->processing = true;
t.reset();
}
}
}
catch (const std::exception& e)
{
// This will happen if the storage fails to initialize
// for example if one of the files has an invalid filename.
session_impl::mutex_t::scoped_lock l(m_ses.m_mutex);
mutex::scoped_lock l2(m_mutex);
if (m_ses.m_alerts.should_post(alert::fatal))
{
m_ses.m_alerts.post_alert(
file_error_alert(
t->torrent_ptr->get_handle()
, e.what()));
}
t->torrent_ptr->abort();
assert(!m_torrents.empty());
m_torrents.pop_front();
}
catch(...)
{
#ifndef NDEBUG
std::cerr << "error while checking resume data\n";
#endif
mutex::scoped_lock l(m_mutex);
assert(!m_torrents.empty());
m_torrents.pop_front();
assert(false);
}
if (!processing) continue;
try
{
assert(processing);
float finished = false;
float progress = 0.f;
boost::tie(finished, progress) = processing->torrent_ptr->check_files();
{
mutex::scoped_lock l(m_mutex);
INVARIANT_CHECK;
processing->progress = progress;
if (processing->abort)
{
assert(!m_processing.empty());
assert(m_processing.front() == processing);
processing->torrent_ptr->abort();
processing.reset();
m_processing.pop_front();
if (!m_processing.empty())
{
processing = m_processing.front();
processing->processing = true;
}
continue;
}
}
if (finished)
{
// lock the session to add the new torrent
session_impl::mutex_t::scoped_lock l(m_ses.m_mutex);
mutex::scoped_lock l2(m_mutex);
INVARIANT_CHECK;
assert(!m_processing.empty());
assert(m_processing.front() == processing);
// TODO: factor out the adding of torrents to the session
// and to the checker thread to avoid duplicating the
// check for abortion.
if (!m_ses.is_aborted())
{
processing->torrent_ptr->files_checked(processing->unfinished_pieces);
m_ses.m_torrents.insert(std::make_pair(
processing->info_hash, processing->torrent_ptr));
if (processing->torrent_ptr->is_seed()
&& m_ses.m_alerts.should_post(alert::info))
{
m_ses.m_alerts.post_alert(torrent_finished_alert(
processing->torrent_ptr->get_handle()
, "torrent is complete"));
}
peer_id id;
std::fill(id.begin(), id.end(), 0);
for (std::vector<tcp::endpoint>::const_iterator i = processing->peers.begin();
i != processing->peers.end(); ++i)
{
processing->torrent_ptr->get_policy().peer_from_tracker(*i, id
, peer_info::resume_data, 0);
}
}
else
{
processing->torrent_ptr->abort();
}
processing.reset();
m_processing.pop_front();
if (!m_processing.empty())
{
processing = m_processing.front();
processing->processing = true;
}
}
}
catch(std::exception const& e)
{
// This will happen if the storage fails to initialize
session_impl::mutex_t::scoped_lock l(m_ses.m_mutex);
mutex::scoped_lock l2(m_mutex);
if (m_ses.m_alerts.should_post(alert::fatal))
{
m_ses.m_alerts.post_alert(
file_error_alert(
processing->torrent_ptr->get_handle()
, e.what()));
}
assert(!m_processing.empty());
processing->torrent_ptr->abort();
processing.reset();
m_processing.pop_front();
if (!m_processing.empty())
{
processing = m_processing.front();
processing->processing = true;
}
}
catch(...)
{
#ifndef NDEBUG
std::cerr << "error while checking files\n";
#endif
mutex::scoped_lock l(m_mutex);
assert(!m_processing.empty());
processing.reset();
m_processing.pop_front();
if (!m_processing.empty())
{
processing = m_processing.front();
processing->processing = true;
}
assert(false);
}
}
}
aux::piece_checker_data* checker_impl::find_torrent(sha1_hash const& info_hash)
{
INVARIANT_CHECK;
for (std::deque<boost::shared_ptr<piece_checker_data> >::iterator i
= m_torrents.begin(); i != m_torrents.end(); ++i)
{
if ((*i)->info_hash == info_hash) return i->get();
}
for (std::deque<boost::shared_ptr<piece_checker_data> >::iterator i
= m_processing.begin(); i != m_processing.end(); ++i)
{
if ((*i)->info_hash == info_hash) return i->get();
}
return 0;
}
void checker_impl::remove_torrent(sha1_hash const& info_hash)
{
INVARIANT_CHECK;
for (std::deque<boost::shared_ptr<piece_checker_data> >::iterator i
= m_torrents.begin(); i != m_torrents.end(); ++i)
{
if ((*i)->info_hash == info_hash)
{
assert((*i)->processing == false);
m_torrents.erase(i);
return;
}
}
for (std::deque<boost::shared_ptr<piece_checker_data> >::iterator i
= m_processing.begin(); i != m_processing.end(); ++i)
{
if ((*i)->info_hash == info_hash)
{
assert((*i)->processing == false);
m_processing.erase(i);
return;
}
}
assert(false);
}
#ifndef NDEBUG
void checker_impl::check_invariant() const
{
for (std::deque<boost::shared_ptr<piece_checker_data> >::const_iterator i
= m_torrents.begin(); i != m_torrents.end(); ++i)
{
assert(*i);
assert((*i)->torrent_ptr);
}
for (std::deque<boost::shared_ptr<piece_checker_data> >::const_iterator i
= m_processing.begin(); i != m_processing.end(); ++i)
{
assert(*i);
assert((*i)->torrent_ptr);
}
}
#endif
struct seed_random_generator
{
seed_random_generator()
{
std::srand(total_microseconds(time_now() - min_time()));
}
};
session_impl::session_impl(
std::pair<int, int> listen_port_range
, fingerprint const& cl_fprint
, char const* listen_interface)
: m_strand(m_io_service)
, m_files(40)
, m_half_open(m_io_service)
, m_dl_bandwidth_manager(m_io_service, peer_connection::download_channel)
, m_ul_bandwidth_manager(m_io_service, peer_connection::upload_channel)
, m_tracker_manager(m_settings, m_tracker_proxy)
, m_listen_port_range(listen_port_range)
, m_listen_interface(address::from_string(listen_interface), listen_port_range.first)
, m_external_listen_port(0)
, m_abort(false)
, m_max_uploads(-1)
, m_max_connections(-1)
, m_incoming_connection(false)
, m_last_tick(time_now())
#ifndef TORRENT_DISABLE_DHT
, m_dht_same_port(true)
, m_external_udp_port(0)
#endif
, m_timer(m_io_service)
, m_next_connect_torrent(0)
, m_checker_impl(*this)
{
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
m_logger = create_log("main_session", listen_port(), false);
(*m_logger) << time_now_string() << "\n";
m_dl_bandwidth_manager.m_ses = this;
m_ul_bandwidth_manager.m_ses = this;
#endif
#ifdef TORRENT_STATS
m_stats_logger.open("session_stats.log");
m_stats_logger <<
"1. second\n"
"2. upload rate\n"
"3. download rate\n"
"4. downloading torrents\n"
"5. seeding torrents\n"
"6. peers\n"
"7. connecting peers\n"
"\n";
m_second_counter = 0;
#endif
// ---- generate a peer id ----
static seed_random_generator seeder;
m_key = rand() + (rand() << 15) + (rand() << 30);
std::string print = cl_fprint.to_string();
assert(print.length() <= 20);
// the client's fingerprint
std::copy(
print.begin()
, print.begin() + print.length()
, m_peer_id.begin());
// http-accepted characters:
static char const printable[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz-_.!~*'()";
// the random number
for (unsigned char* i = m_peer_id.begin() + print.length();
i != m_peer_id.end(); ++i)
{
*i = printable[rand() % (sizeof(printable)-1)];
}
m_timer.expires_from_now(seconds(1));
m_timer.async_wait(m_strand.wrap(
bind(&session_impl::second_tick, this, _1)));
m_thread.reset(new boost::thread(boost::ref(*this)));
m_checker_thread.reset(new boost::thread(boost::ref(m_checker_impl)));
}
#ifndef TORRENT_DISABLE_EXTENSIONS
void session_impl::add_extension(
boost::function<boost::shared_ptr<torrent_plugin>(torrent*)> ext)
{
m_extensions.push_back(ext);
}
#endif
#ifndef TORRENT_DISABLE_DHT
void session_impl::add_dht_node(udp::endpoint n)
{
if (m_dht) m_dht->add_node(n);
}
#endif
void session_impl::abort()
{
mutex_t::scoped_lock l(m_mutex);
assert(!m_abort);
// abort the main thread
m_abort = true;
m_io_service.stop();
l.unlock();
mutex::scoped_lock l2(m_checker_impl.m_mutex);
// abort the checker thread
m_checker_impl.m_abort = true;
}
void session_impl::set_ip_filter(ip_filter const& f)
{
mutex_t::scoped_lock l(m_mutex);
m_ip_filter = f;
// Close connections whose endpoint is filtered
// by the new ip-filter
for (session_impl::connection_map::iterator i
= m_connections.begin(); i != m_connections.end();)
{
tcp::endpoint sender = i->first->remote_endpoint();
if (m_ip_filter.access(sender.address()) & ip_filter::blocked)
{
#if defined(TORRENT_VERBOSE_LOGGING)
(*i->second->m_logger) << "*** CONNECTION FILTERED\n";
#endif
if (m_alerts.should_post(alert::info))
{
m_alerts.post_alert(peer_blocked_alert(sender.address()
, "peer connection closed by IP filter"));
}
session_impl::connection_map::iterator j = i;
++i;
j->second->disconnect();
}
else ++i;
}
}
void session_impl::set_settings(session_settings const& s)
{
mutex_t::scoped_lock l(m_mutex);
assert(s.connection_speed > 0);
assert(s.file_pool_size > 0);
m_settings = s;
m_files.resize(m_settings.file_pool_size);
// replace all occurances of '\n' with ' '.
std::string::iterator i = m_settings.user_agent.begin();
while ((i = std::find(i, m_settings.user_agent.end(), '\n'))
!= m_settings.user_agent.end())
*i = ' ';
}
void session_impl::open_listen_port()
{
try
{
// create listener socket
m_listen_socket = boost::shared_ptr<socket_acceptor>(new socket_acceptor(m_io_service));
for(;;)
{
try
{
m_listen_socket->open(m_listen_interface.protocol());
m_listen_socket->bind(m_listen_interface);
m_listen_socket->listen();
m_external_listen_port = m_listen_interface.port();
break;
}
catch (asio::system_error& e)
{
// TODO: make sure this is correct
if (e.code() == asio::error::host_not_found)
{
if (m_alerts.should_post(alert::fatal))
{
std::string msg = "cannot listen on the given interface '"
+ m_listen_interface.address().to_string() + "'";
m_alerts.post_alert(listen_failed_alert(msg));
}
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
std::string msg = "cannot listen on the given interface '"
+ m_listen_interface.address().to_string() + "'";
(*m_logger) << msg << "\n";
#endif
assert(m_listen_socket.unique());
m_listen_socket.reset();
break;
}
m_listen_socket->close();
m_listen_interface.port(m_listen_interface.port() + 1);
if (m_listen_interface.port() > m_listen_port_range.second)
{
std::stringstream msg;
msg << "none of the ports in the range ["
<< m_listen_port_range.first
<< ", " << m_listen_port_range.second
<< "] could be opened for listening";
m_alerts.post_alert(listen_failed_alert(msg.str()));
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_logger) << msg.str() << "\n";
#endif
m_listen_socket.reset();
break;
}
}
}
}
catch (asio::system_error& e)
{
if (m_alerts.should_post(alert::fatal))
{
m_alerts.post_alert(listen_failed_alert(
std::string("failed to open listen port: ") + e.what()));
}
}
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
if (m_listen_socket)
{
(*m_logger) << "listening on port: " << m_listen_interface.port()
<< " external port: " << m_external_listen_port << "\n";
}
#endif
if (m_listen_socket) async_accept();
}
void session_impl::async_accept()
{
shared_ptr<socket_type> c(new socket_type(m_io_service));
c->instantiate<stream_socket>();
m_listen_socket->async_accept(c->get<stream_socket>()
, bind(&session_impl::on_incoming_connection, this, c
, weak_ptr<socket_acceptor>(m_listen_socket), _1));
}
void session_impl::on_incoming_connection(shared_ptr<socket_type> const& s
, weak_ptr<socket_acceptor> const& listen_socket, asio::error_code const& e) try
{
if (listen_socket.expired())
return;
if (e == asio::error::operation_aborted)
return;
mutex_t::scoped_lock l(m_mutex);
assert(listen_socket.lock() == m_listen_socket);
if (m_abort) return;
async_accept();
if (e)
{
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
std::string msg = "error accepting connection on '"
+ m_listen_interface.address().to_string() + "'";
(*m_logger) << msg << "\n";
#endif
assert(m_listen_socket.unique());
return;
}
// we got a connection request!
m_incoming_connection = true;
tcp::endpoint endp = s->remote_endpoint();
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_logger) << endp << " <== INCOMING CONNECTION\n";
#endif
if (m_ip_filter.access(endp.address()) & ip_filter::blocked)
{
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_logger) << "filtered blocked ip\n";
#endif
if (m_alerts.should_post(alert::info))
{
m_alerts.post_alert(peer_blocked_alert(endp.address()
, "incoming connection blocked by IP filter"));
}
return;
}
boost::intrusive_ptr<peer_connection> c(
new bt_peer_connection(*this, s, 0));
#ifndef NDEBUG
c->m_in_constructor = false;
#endif
m_connections.insert(std::make_pair(s, c));
}
catch (std::exception& exc)
{
#ifndef NDEBUG
std::string err = exc.what();
#endif
};
void session_impl::connection_failed(boost::shared_ptr<socket_type> const& s
, tcp::endpoint const& a, char const* message)
#ifndef NDEBUG
try
#endif
{
mutex_t::scoped_lock l(m_mutex);
connection_map::iterator p = m_connections.find(s);
// the connection may have been disconnected in the receive or send phase
if (p == m_connections.end()) return;
if (m_alerts.should_post(alert::debug))
{
m_alerts.post_alert(
peer_error_alert(
a
, p->second->pid()
, message));
}
#if defined(TORRENT_VERBOSE_LOGGING)
(*p->second->m_logger) << "*** CONNECTION FAILED " << message << "\n";
#endif
p->second->set_failed();
p->second->disconnect();
}
#ifndef NDEBUG
catch (...)
{
assert(false);
};
#endif
void session_impl::close_connection(boost::intrusive_ptr<peer_connection> const& p)
{
mutex_t::scoped_lock l(m_mutex);
assert(p->is_disconnecting());
connection_map::iterator i = m_connections.find(p->get_socket());
if (i != m_connections.end())
m_connections.erase(i);
}
void session_impl::set_peer_id(peer_id const& id)
{
mutex_t::scoped_lock l(m_mutex);
m_peer_id = id;
}
void session_impl::set_key(int key)
{
mutex_t::scoped_lock l(m_mutex);
m_key = key;
}
void session_impl::second_tick(asio::error_code const& e) try
{
session_impl::mutex_t::scoped_lock l(m_mutex);
if (e)
{
#if defined(TORRENT_LOGGING)
(*m_logger) << "*** SECOND TIMER FAILED " << e.message() << "\n";
#endif
m_abort = true;
m_io_service.stop();
return;
}
if (m_abort) return;
float tick_interval = total_microseconds(time_now() - m_last_tick) / 1000000.f;
m_last_tick = time_now();
m_timer.expires_from_now(seconds(1));
m_timer.async_wait(m_strand.wrap(
bind(&session_impl::second_tick, this, _1)));
#ifdef TORRENT_STATS
++m_second_counter;
int downloading_torrents = 0;
int seeding_torrents = 0;
for (torrent_map::iterator i = m_torrents.begin()
, end(m_torrents.end()); i != end; ++i)
{
if (i->second->is_seed())
++seeding_torrents;
else
++downloading_torrents;
}
int num_connections = 0;
int num_half_open = 0;
for (connection_map::iterator i = m_connections.begin()
, end(m_connections.end()); i != end; ++i)
{
if (i->second->is_connecting())
++num_half_open;
else
++num_connections;
}
m_stats_logger
<< m_second_counter << "\t"
<< m_stat.upload_rate() << "\t"
<< m_stat.download_rate() << "\t"
<< downloading_torrents << "\t"
<< seeding_torrents << "\t"
<< num_connections << "\t"
<< num_half_open << "\t"
<< std::endl;
#endif
// let torrents connect to peers if they want to
// if there are any torrents and any free slots
// this loop will "hand out" max(connection_speed
// , half_open.free_slots()) to the torrents, in a
// round robin fashion, so that every torrent is
// equallt likely to connect to a peer
if (!m_torrents.empty() && m_half_open.free_slots())
{
// this is the maximum number of connections we will
// attempt this tick
int max_connections = m_settings.connection_speed;
torrent_map::iterator i = m_torrents.begin();
if (m_next_connect_torrent < int(m_torrents.size()))
std::advance(i, m_next_connect_torrent);
else
m_next_connect_torrent = 0;
int steps_since_last_connect = 0;
int num_torrents = int(m_torrents.size());
for (;;)
{
torrent& t = *i->second;
if (t.want_more_peers())
if (t.try_connect_peer())
{
--max_connections;
steps_since_last_connect = 0;
}
++m_next_connect_torrent;
++steps_since_last_connect;
++i;
if (i == m_torrents.end())
{
assert(m_next_connect_torrent == num_torrents);
i = m_torrents.begin();
m_next_connect_torrent = 0;
}
// if we have gone one whole loop without
// handing out a single connection, break
if (steps_since_last_connect > num_torrents) break;
// if there are no more free connection slots, abort
if (m_half_open.free_slots() == 0) break;
// if we should not make any more connections
// attempts this tick, abort
if (max_connections == 0) break;
}
}
// do the second_tick() on each connection
// this will update their statistics (download and upload speeds)
// also purge sockets that have timed out
// and keep sockets open by keeping them alive.
for (connection_map::iterator i = m_connections.begin();
i != m_connections.end();)
{
// we need to do like this because j->second->disconnect() will
// erase the connection from the map we're iterating
connection_map::iterator j = i;
++i;
// if this socket has timed out
// close it.
peer_connection& c = *j->second;
if (c.has_timed_out())
{
if (m_alerts.should_post(alert::debug))
{
m_alerts.post_alert(
peer_error_alert(
c.remote()
, c.pid()
, "connection timed out"));
}
#if defined(TORRENT_VERBOSE_LOGGING)
(*c.m_logger) << "*** CONNECTION TIMED OUT\n";
#endif
c.set_failed();
c.disconnect();
continue;
}
try
{
c.keep_alive();
}
catch (std::exception& exc)
{
#ifdef TORRENT_VERBOSE_LOGGING
(*c.m_logger) << "**ERROR**: " << exc.what() << "\n";
#endif
c.set_failed();
c.disconnect();
}
}
// check each torrent for tracker updates
// TODO: do this in a timer-event in each torrent instead
for (torrent_map::iterator i = m_torrents.begin();
i != m_torrents.end();)
{
torrent& t = *i->second;
assert(!t.is_aborted());
if (t.should_request())
{
tracker_request req = t.generate_tracker_request();
req.listen_port = m_external_listen_port;
req.key = m_key;
m_tracker_manager.queue_request(m_strand, m_half_open, req
, t.tracker_login(), m_listen_interface.address(), i->second);
if (m_alerts.should_post(alert::info))
{
m_alerts.post_alert(
tracker_announce_alert(
t.get_handle(), "tracker announce"));
}
}
// second_tick() will set the used upload quota
t.second_tick(m_stat, tick_interval);
++i;
}
m_stat.second_tick(tick_interval);
// distribute the maximum upload rate among the torrents
assert(m_max_uploads >= -1);
assert(m_max_connections >= -1);
allocate_resources(m_max_uploads == -1
? std::numeric_limits<int>::max()
: m_max_uploads
, m_torrents
, &torrent::m_uploads_quota);
allocate_resources(m_max_connections == -1
? std::numeric_limits<int>::max()
: m_max_connections
, m_torrents
, &torrent::m_connections_quota);
for (std::map<sha1_hash, boost::shared_ptr<torrent> >::iterator i
= m_torrents.begin(); i != m_torrents.end(); ++i)
{
#ifndef NDEBUG
i->second->check_invariant();
#endif
i->second->distribute_resources(tick_interval);
}
}
catch (std::exception& exc)
{
#ifndef NDEBUG
std::cerr << exc.what() << std::endl;
assert(false);
#endif
}; // msvc 7.1 seems to require this
/*
void session_impl::connection_completed(
boost::intrusive_ptr<peer_connection> const& p) try
{
mutex_t::scoped_lock l(m_mutex);
connection_map::iterator i = m_half_open.find(p->get_socket());
m_connections.insert(std::make_pair(p->get_socket(), p));
assert(i != m_half_open.end());
if (i != m_half_open.end()) m_half_open.erase(i);
if (m_abort) return;
process_connection_queue();
}
catch (std::exception& e)
{
#ifndef NDEBUG
std::cerr << e.what() << std::endl;
assert(false);
#endif
};
*/
void session_impl::operator()()
{
eh_initializer();
if (m_listen_port_range.first != 0 && m_listen_port_range.second != 0)
{
session_impl::mutex_t::scoped_lock l(m_mutex);
open_listen_port();
if (m_natpmp.get())
m_natpmp->set_mappings(m_listen_interface.port(), 0);
if (m_upnp.get())
m_upnp->set_mappings(m_listen_interface.port(), 0);
}
ptime timer = time_now();
do
{
try
{
m_io_service.run();
assert(m_abort == true);
}
catch (std::exception& e)
{
#ifndef NDEBUG
std::cerr << e.what() << "\n";
std::string err = e.what();
#endif
assert(false);
}
}
while (!m_abort);
deadline_timer tracker_timer(m_io_service);
// this will remove the port mappings
if (m_natpmp.get())
m_natpmp->close();
if (m_upnp.get())
m_upnp->close();
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_logger) << time_now_string() << " locking mutex\n";
#endif
session_impl::mutex_t::scoped_lock l(m_mutex);
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_logger) << time_now_string() << " aborting all tracker requests\n";
#endif
m_tracker_manager.abort_all_requests();
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_logger) << time_now_string() << " sending stopped to all torrent's trackers\n";
#endif
for (std::map<sha1_hash, boost::shared_ptr<torrent> >::iterator i =
m_torrents.begin(); i != m_torrents.end(); ++i)
{
i->second->abort();
// generate a tracker request in case the torrent is not paused
// (in which case it's not currently announced with the tracker)
// or if the torrent itself thinks we should request. Do not build
// a request in case the torrent doesn't have any trackers
if ((!i->second->is_paused() || i->second->should_request())
&& !i->second->trackers().empty())
{
tracker_request req = i->second->generate_tracker_request();
assert(m_external_listen_port > 0);
req.listen_port = m_external_listen_port;
req.key = m_key;
std::string login = i->second->tracker_login();
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
boost::shared_ptr<tracker_logger> tl(new tracker_logger(*this));
m_tracker_loggers.push_back(tl);
m_tracker_manager.queue_request(m_strand, m_half_open, req, login
, m_listen_interface.address(), tl);
#else
m_tracker_manager.queue_request(m_strand, m_half_open, req, login
, m_listen_interface.address());
#endif
}
}
ptime start(time_now());
l.unlock();
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_logger) << time_now_string() << " waiting for trackers to respond ("
<< m_settings.stop_tracker_timeout << " seconds timeout)\n";
#endif
while (time_now() - start < seconds(
m_settings.stop_tracker_timeout)
&& !m_tracker_manager.empty())
{
tracker_timer.expires_from_now(milliseconds(100));
tracker_timer.async_wait(m_strand.wrap(
bind(&io_service::stop, &m_io_service)));
m_io_service.reset();
m_io_service.run();
}
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_logger) << time_now_string() << " tracker shutdown complete, locking mutex\n";
#endif
l.lock();
assert(m_abort);
m_abort = true;
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_logger) << time_now_string() << " cleaning up connections\n";
#endif
while (!m_connections.empty())
m_connections.begin()->second->disconnect();
#ifndef NDEBUG
for (torrent_map::iterator i = m_torrents.begin();
i != m_torrents.end(); ++i)
{
assert(i->second->num_peers() == 0);
}
#endif
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_logger) << time_now_string() << " cleaning up torrents\n";
#endif
m_torrents.clear();
assert(m_torrents.empty());
assert(m_connections.empty());
}
// the return value from this function is valid only as long as the
// session is locked!
boost::weak_ptr<torrent> session_impl::find_torrent(sha1_hash const& info_hash)
{
std::map<sha1_hash, boost::shared_ptr<torrent> >::iterator i
= m_torrents.find(info_hash);
#ifndef NDEBUG
for (std::map<sha1_hash, boost::shared_ptr<torrent> >::iterator j
= m_torrents.begin(); j != m_torrents.end(); ++j)
{
torrent* p = boost::get_pointer(j->second);
assert(p);
}
#endif
if (i != m_torrents.end()) return i->second;
return boost::weak_ptr<torrent>();
}
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
boost::shared_ptr<logger> session_impl::create_log(std::string const& name
, int instance, bool append)
{
// current options are file_logger, cout_logger and null_logger
return boost::shared_ptr<logger>(new logger(name + ".log", instance, append));
}
#endif
std::vector<torrent_handle> session_impl::get_torrents()
{
mutex_t::scoped_lock l(m_mutex);
mutex::scoped_lock l2(m_checker_impl.m_mutex);
std::vector<torrent_handle> ret;
for (std::deque<boost::shared_ptr<aux::piece_checker_data> >::iterator i
= m_checker_impl.m_torrents.begin()
, end(m_checker_impl.m_torrents.end()); i != end; ++i)
{
if ((*i)->abort) continue;
ret.push_back(torrent_handle(this, &m_checker_impl
, (*i)->info_hash));
}
for (std::deque<boost::shared_ptr<aux::piece_checker_data> >::iterator i
= m_checker_impl.m_processing.begin()
, end(m_checker_impl.m_processing.end()); i != end; ++i)
{
if ((*i)->abort) continue;
ret.push_back(torrent_handle(this, &m_checker_impl
, (*i)->info_hash));
}
for (session_impl::torrent_map::iterator i
= m_torrents.begin(), end(m_torrents.end());
i != end; ++i)
{
if (i->second->is_aborted()) continue;
ret.push_back(torrent_handle(this, &m_checker_impl
, i->first));
}
return ret;
}
torrent_handle session_impl::find_torrent_handle(sha1_hash const& info_hash)
{
return torrent_handle(this, &m_checker_impl, info_hash);
}
torrent_handle session_impl::add_torrent(
torrent_info const& ti
, boost::filesystem::path const& save_path
, entry const& resume_data
, bool compact_mode
, int block_size
, storage_constructor_type sc)
{
// if you get this assert, you haven't managed to
// open a listen port. call listen_on() first.
assert(m_external_listen_port > 0);
// make sure the block_size is an even power of 2
#ifndef NDEBUG
for (int i = 0; i < 32; ++i)
{
if (block_size & (1 << i))
{
assert((block_size & ~(1 << i)) == 0);
break;
}
}
#endif
assert(!save_path.empty());
if (ti.begin_files() == ti.end_files())
throw std::runtime_error("no files in torrent");
// lock the session and the checker thread (the order is important!)
mutex_t::scoped_lock l(m_mutex);
mutex::scoped_lock l2(m_checker_impl.m_mutex);
if (is_aborted())
throw std::runtime_error("session is closing");
// is the torrent already active?
if (!find_torrent(ti.info_hash()).expired())
throw duplicate_torrent();
// is the torrent currently being checked?
if (m_checker_impl.find_torrent(ti.info_hash()))
throw duplicate_torrent();
// create the torrent and the data associated with
// the checker thread and store it before starting
// the thread
boost::shared_ptr<torrent> torrent_ptr(
new torrent(*this, m_checker_impl, ti, save_path
, m_listen_interface, compact_mode, block_size
, settings(), sc));
torrent_ptr->start();
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end; ++i)
{
boost::shared_ptr<torrent_plugin> tp((*i)(torrent_ptr.get()));
if (tp) torrent_ptr->add_extension(tp);
}
#endif
boost::shared_ptr<aux::piece_checker_data> d(
new aux::piece_checker_data);
d->torrent_ptr = torrent_ptr;
d->save_path = save_path;
d->info_hash = ti.info_hash();
d->resume_data = resume_data;
#ifndef TORRENT_DISABLE_DHT
if (m_dht)
{
torrent_info::nodes_t const& nodes = ti.nodes();
std::for_each(nodes.begin(), nodes.end(), bind(
(void(dht::dht_tracker::*)(std::pair<std::string, int> const&))
&dht::dht_tracker::add_node
, boost::ref(m_dht), _1));
}
#endif
// add the torrent to the queue to be checked
m_checker_impl.m_torrents.push_back(d);
// and notify the thread that it got another
// job in its queue
m_checker_impl.m_cond.notify_one();
return torrent_handle(this, &m_checker_impl, ti.info_hash());
}
torrent_handle session_impl::add_torrent(
char const* tracker_url
, sha1_hash const& info_hash
, char const* name
, boost::filesystem::path const& save_path
, entry const&
, bool compact_mode
, int block_size
, storage_constructor_type sc)
{
// make sure the block_size is an even power of 2
#ifndef NDEBUG
for (int i = 0; i < 32; ++i)
{
if (block_size & (1 << i))
{
assert((block_size & ~(1 << i)) == 0);
break;
}
}
#endif
// TODO: support resume data in this case
assert(!save_path.empty());
{
// lock the checker_thread
mutex::scoped_lock l(m_checker_impl.m_mutex);
// is the torrent currently being checked?
if (m_checker_impl.find_torrent(info_hash))
throw duplicate_torrent();
}
// lock the session
session_impl::mutex_t::scoped_lock l(m_mutex);
// is the torrent already active?
if (!find_torrent(info_hash).expired())
throw duplicate_torrent();
// you cannot add new torrents to a session that is closing down
assert(!is_aborted());
// create the torrent and the data associated with
// the checker thread and store it before starting
// the thread
boost::shared_ptr<torrent> torrent_ptr(
new torrent(*this, m_checker_impl, tracker_url, info_hash, name
, save_path, m_listen_interface, compact_mode, block_size
, settings(), sc));
torrent_ptr->start();
#ifndef TORRENT_DISABLE_EXTENSIONS
for (extension_list_t::iterator i = m_extensions.begin()
, end(m_extensions.end()); i != end; ++i)
{
boost::shared_ptr<torrent_plugin> tp((*i)(torrent_ptr.get()));
if (tp) torrent_ptr->add_extension(tp);
}
#endif
m_torrents.insert(
std::make_pair(info_hash, torrent_ptr)).first;
return torrent_handle(this, &m_checker_impl, info_hash);
}
void session_impl::remove_torrent(const torrent_handle& h)
{
if (h.m_ses != this) return;
assert(h.m_chk == &m_checker_impl || h.m_chk == 0);
assert(h.m_ses != 0);
mutex_t::scoped_lock l(m_mutex);
session_impl::torrent_map::iterator i =
m_torrents.find(h.m_info_hash);
if (i != m_torrents.end())
{
torrent& t = *i->second;
t.abort();
if ((!t.is_paused() || t.should_request())
&& !t.torrent_file().trackers().empty())
{
tracker_request req = t.generate_tracker_request();
assert(req.event == tracker_request::stopped);
assert(m_external_listen_port > 0);
req.listen_port = m_external_listen_port;
req.key = m_key;
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
boost::shared_ptr<tracker_logger> tl(new tracker_logger(*this));
m_tracker_loggers.push_back(tl);
m_tracker_manager.queue_request(m_strand, m_half_open, req
, t.tracker_login(), m_listen_interface.address(), tl);
#else
m_tracker_manager.queue_request(m_strand, m_half_open, req
, t.tracker_login(), m_listen_interface.address());
#endif
if (m_alerts.should_post(alert::info))
{
m_alerts.post_alert(
tracker_announce_alert(
t.get_handle(), "tracker announce, event=stopped"));
}
}
#ifndef NDEBUG
sha1_hash i_hash = t.torrent_file().info_hash();
#endif
m_torrents.erase(i);
assert(m_torrents.find(i_hash) == m_torrents.end());
return;
}
l.unlock();
if (h.m_chk)
{
mutex::scoped_lock l(m_checker_impl.m_mutex);
aux::piece_checker_data* d = m_checker_impl.find_torrent(h.m_info_hash);
if (d != 0)
{
if (d->processing) d->abort = true;
else m_checker_impl.remove_torrent(h.m_info_hash);
return;
}
}
}
bool session_impl::listen_on(
std::pair<int, int> const& port_range
, const char* net_interface)
{
session_impl::mutex_t::scoped_lock l(m_mutex);
tcp::endpoint new_interface;
if (net_interface && std::strlen(net_interface) > 0)
new_interface = tcp::endpoint(address::from_string(net_interface), port_range.first);
else
new_interface = tcp::endpoint(address(), port_range.first);
m_listen_port_range = port_range;
// if the interface is the same and the socket is open
// don't do anything
if (new_interface == m_listen_interface
&& m_listen_socket) return true;
if (m_listen_socket)
m_listen_socket.reset();
m_incoming_connection = false;
m_listen_interface = new_interface;
open_listen_port();
bool new_listen_address = m_listen_interface.address() != new_interface.address();
if (new_listen_address)
{
if (m_natpmp.get())
m_natpmp->rebind(new_interface.address());
if (m_upnp.get())
m_upnp->rebind(new_interface.address());
if (m_lsd.get())
m_lsd->rebind(new_interface.address());
}
if (m_natpmp.get())
m_natpmp->set_mappings(m_listen_interface.port(), 0);
if (m_upnp.get())
m_upnp->set_mappings(m_listen_interface.port(), 0);
#ifndef TORRENT_DISABLE_DHT
if ((new_listen_address || m_dht_same_port) && m_dht)
{
if (m_dht_same_port)
m_dht_settings.service_port = new_interface.port();
// the listen interface changed, rebind the dht listen socket as well
m_dht->rebind(new_interface.address()
, m_dht_settings.service_port);
if (m_natpmp.get())
m_natpmp->set_mappings(0, m_dht_settings.service_port);
if (m_upnp.get())
m_upnp->set_mappings(0, m_dht_settings.service_port);
}
#endif
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
m_logger = create_log("main_session", listen_port(), false);
(*m_logger) << time_now_string() << "\n";
#endif
return m_listen_socket;
}
unsigned short session_impl::listen_port() const
{
mutex_t::scoped_lock l(m_mutex);
return m_external_listen_port;
}
void session_impl::announce_lsd(sha1_hash const& ih)
{
mutex_t::scoped_lock l(m_mutex);
// use internal listen port for local peers
if (m_lsd.get())
m_lsd->announce(ih, m_listen_interface.port());
}
void session_impl::on_lsd_peer(tcp::endpoint peer, sha1_hash const& ih)
{
mutex_t::scoped_lock l(m_mutex);
boost::shared_ptr<torrent> t = find_torrent(ih).lock();
if (!t) return;
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_logger) << time_now_string()
<< ": added peer from local discovery: " << peer << "\n";
#endif
t->get_policy().peer_from_tracker(peer, peer_id(0), peer_info::lsd, 0);
}
void session_impl::on_port_mapping(int tcp_port, int udp_port
, std::string const& errmsg)
{
#ifndef TORRENT_DISABLE_DHT
if (udp_port != 0)
{
m_external_udp_port = udp_port;
m_dht_settings.service_port = udp_port;
if (m_alerts.should_post(alert::info))
{
std::stringstream msg;
msg << "successfully mapped UDP port " << udp_port;
m_alerts.post_alert(portmap_alert(msg.str()));
}
}
#endif
if (tcp_port != 0)
{
m_external_listen_port = tcp_port;
if (m_alerts.should_post(alert::info))
{
std::stringstream msg;
msg << "successfully mapped TCP port " << tcp_port;
m_alerts.post_alert(portmap_alert(msg.str()));
}
}
if (!errmsg.empty())
{
if (m_alerts.should_post(alert::warning))
{
std::stringstream msg;
msg << "Error while mapping ports on NAT router: " << errmsg;
m_alerts.post_alert(portmap_error_alert(msg.str()));
}
}
}
session_status session_impl::status() const
{
mutex_t::scoped_lock l(m_mutex);
session_status s;
s.has_incoming_connections = m_incoming_connection;
s.num_peers = (int)m_connections.size();
s.download_rate = m_stat.download_rate();
s.upload_rate = m_stat.upload_rate();
s.payload_download_rate = m_stat.download_payload_rate();
s.payload_upload_rate = m_stat.upload_payload_rate();
s.total_download = m_stat.total_protocol_download()
+ m_stat.total_payload_download();
s.total_upload = m_stat.total_protocol_upload()
+ m_stat.total_payload_upload();
s.total_payload_download = m_stat.total_payload_download();
s.total_payload_upload = m_stat.total_payload_upload();
#ifndef TORRENT_DISABLE_DHT
if (m_dht)
{
m_dht->dht_status(s);
}
else
{
s.dht_nodes = 0;
s.dht_node_cache = 0;
s.dht_torrents = 0;
s.dht_global_nodes = 0;
}
#endif
return s;
}
#ifndef TORRENT_DISABLE_DHT
void session_impl::start_dht(entry const& startup_state)
{
mutex_t::scoped_lock l(m_mutex);
if (m_dht)
{
m_dht->stop();
m_dht = 0;
}
if (m_dht_settings.service_port == 0
|| m_dht_same_port)
{
m_dht_same_port = true;
// if you hit this assert you are trying to start the
// DHT with the same port as the tcp listen port
// (which is default) _before_ you have opened the
// tcp listen port (so there is no configured port to use)
// basically, make sure you call listen_on() before
// start_dht(). See documentation for listen_on() for
// more information.
assert(m_listen_interface.port() > 0);
m_dht_settings.service_port = m_listen_interface.port();
}
m_external_udp_port = m_dht_settings.service_port;
if (m_natpmp.get())
m_natpmp->set_mappings(0, m_dht_settings.service_port);
if (m_upnp.get())
m_upnp->set_mappings(0, m_dht_settings.service_port);
m_dht = new dht::dht_tracker(m_io_service
, m_dht_settings, m_listen_interface.address()
, startup_state);
}
void session_impl::stop_dht()
{
mutex_t::scoped_lock l(m_mutex);
if (!m_dht) return;
m_dht->stop();
m_dht = 0;
}
void session_impl::set_dht_settings(dht_settings const& settings)
{
mutex_t::scoped_lock l(m_mutex);
// only change the dht listen port in case the settings
// contains a vaiid port, and if it is different from
// the current setting
if (settings.service_port != 0)
m_dht_same_port = false;
else
m_dht_same_port = true;
if (!m_dht_same_port
&& settings.service_port != m_dht_settings.service_port
&& m_dht)
{
m_dht->rebind(m_listen_interface.address()
, settings.service_port);
if (m_natpmp.get())
m_natpmp->set_mappings(0, m_dht_settings.service_port);
if (m_upnp.get())
m_upnp->set_mappings(0, m_dht_settings.service_port);
m_external_udp_port = settings.service_port;
}
m_dht_settings = settings;
if (m_dht_same_port)
m_dht_settings.service_port = m_listen_interface.port();
}
entry session_impl::dht_state() const
{
assert(m_dht);
mutex_t::scoped_lock l(m_mutex);
return m_dht->state();
}
void session_impl::add_dht_node(std::pair<std::string, int> const& node)
{
assert(m_dht);
mutex_t::scoped_lock l(m_mutex);
m_dht->add_node(node);
}
void session_impl::add_dht_router(std::pair<std::string, int> const& node)
{
assert(m_dht);
mutex_t::scoped_lock l(m_mutex);
m_dht->add_router_node(node);
}
#endif
void session_impl::set_download_rate_limit(int bytes_per_second)
{
assert(bytes_per_second > 0 || bytes_per_second == -1);
mutex_t::scoped_lock l(m_mutex);
if (bytes_per_second == -1) bytes_per_second = bandwidth_limit::inf;
m_dl_bandwidth_manager.throttle(bytes_per_second);
}
bool session_impl::is_listening() const
{
mutex_t::scoped_lock l(m_mutex);
return m_listen_socket;
}
session_impl::~session_impl()
{
#ifndef TORRENT_DISABLE_DHT
stop_dht();
#endif
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_logger) << time_now_string() << "\n\n *** shutting down session *** \n\n";
#endif
// lock the main thread and abort it
mutex_t::scoped_lock l(m_mutex);
m_abort = true;
m_io_service.stop();
l.unlock();
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_logger) << time_now_string() << " waiting for main thread\n";
#endif
m_thread->join();
assert(m_torrents.empty());
// it's important that the main thread is closed completely before
// the checker thread is terminated. Because all the connections
// have to be closed and removed from the torrents before they
// can be destructed. (because the weak pointers in the
// peer_connections will be invalidated when the torrents are
// destructed and then the invariant will be broken).
{
mutex::scoped_lock l(m_checker_impl.m_mutex);
// abort the checker thread
m_checker_impl.m_abort = true;
// abort the currently checking torrent
if (!m_checker_impl.m_torrents.empty())
{
m_checker_impl.m_torrents.front()->abort = true;
}
m_checker_impl.m_cond.notify_one();
}
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_logger) << time_now_string() << " waiting for checker thread\n";
#endif
m_checker_thread->join();
assert(m_torrents.empty());
assert(m_connections.empty());
#if defined(TORRENT_VERBOSE_LOGGING) || defined(TORRENT_LOGGING)
(*m_logger) << time_now_string() << " shutdown complete!\n";
#endif
}
void session_impl::set_max_uploads(int limit)
{
assert(limit > 0 || limit == -1);
mutex_t::scoped_lock l(m_mutex);
m_max_uploads = limit;
}
void session_impl::set_max_connections(int limit)
{
assert(limit > 0 || limit == -1);
mutex_t::scoped_lock l(m_mutex);
m_max_connections = limit;
}
void session_impl::set_max_half_open_connections(int limit)
{
assert(limit > 0 || limit == -1);
mutex_t::scoped_lock l(m_mutex);
m_half_open.limit(limit);
}
void session_impl::set_upload_rate_limit(int bytes_per_second)
{
assert(bytes_per_second > 0 || bytes_per_second == -1);
mutex_t::scoped_lock l(m_mutex);
if (bytes_per_second == -1) bytes_per_second = bandwidth_limit::inf;
m_ul_bandwidth_manager.throttle(bytes_per_second);
}
int session_impl::num_uploads() const
{
int uploads = 0;
mutex_t::scoped_lock l(m_mutex);
for (torrent_map::const_iterator i = m_torrents.begin()
, end(m_torrents.end()); i != end; i++)
{
uploads += i->second->get_policy().num_uploads();
}
return uploads;
}
int session_impl::num_connections() const
{
mutex_t::scoped_lock l(m_mutex);
return m_connections.size();
}
std::auto_ptr<alert> session_impl::pop_alert()
{
mutex_t::scoped_lock l(m_mutex);
if (m_alerts.pending())
return m_alerts.get();
return std::auto_ptr<alert>(0);
}
void session_impl::set_severity_level(alert::severity_t s)
{
mutex_t::scoped_lock l(m_mutex);
m_alerts.set_severity(s);
}
int session_impl::upload_rate_limit() const
{
mutex_t::scoped_lock l(m_mutex);
return m_ul_bandwidth_manager.throttle();
}
int session_impl::download_rate_limit() const
{
mutex_t::scoped_lock l(m_mutex);
return m_dl_bandwidth_manager.throttle();
}
void session_impl::start_lsd()
{
mutex_t::scoped_lock l(m_mutex);
m_lsd.reset(new lsd(m_io_service
, m_listen_interface.address()
, bind(&session_impl::on_lsd_peer, this, _1, _2)));
}
void session_impl::start_natpmp()
{
mutex_t::scoped_lock l(m_mutex);
m_natpmp.reset(new natpmp(m_io_service
, m_listen_interface.address()
, bind(&session_impl::on_port_mapping
, this, _1, _2, _3)));
m_natpmp->set_mappings(m_listen_interface.port(),
#ifndef TORRENT_DISABLE_DHT
m_dht ? m_dht_settings.service_port :
#endif
0);
}
void session_impl::start_upnp()
{
mutex_t::scoped_lock l(m_mutex);
m_upnp.reset(new upnp(m_io_service, m_half_open
, m_listen_interface.address()
, m_settings.user_agent
, bind(&session_impl::on_port_mapping
, this, _1, _2, _3)));
m_upnp->set_mappings(m_listen_interface.port(),
#ifndef TORRENT_DISABLE_DHT
m_dht ? m_dht_settings.service_port :
#endif
0);
}
void session_impl::stop_lsd()
{
mutex_t::scoped_lock l(m_mutex);
m_lsd.reset();
}
void session_impl::stop_natpmp()
{
mutex_t::scoped_lock l(m_mutex);
if (m_natpmp.get())
m_natpmp->close();
m_natpmp.reset();
}
void session_impl::stop_upnp()
{
mutex_t::scoped_lock l(m_mutex);
if (m_upnp.get())
m_upnp->close();
m_upnp.reset();
}
#ifndef NDEBUG
void session_impl::check_invariant(const char *place)
{
assert(place);
for (connection_map::iterator i = m_connections.begin();
i != m_connections.end(); ++i)
{
assert(i->second);
boost::shared_ptr<torrent> t = i->second->associated_torrent().lock();
if (t)
{
assert(t->get_policy().has_connection(boost::get_pointer(i->second)));
}
}
}
#endif
void piece_checker_data::parse_resume_data(
const entry& resume_data
, const torrent_info& info
, std::string& error)
{
// if we don't have any resume data, return
if (resume_data.type() == entry::undefined_t) return;
entry rd = resume_data;
try
{
if (rd["file-format"].string() != "libtorrent resume file")
{
error = "missing file format tag";
return;
}
if (rd["file-version"].integer() > 1)
{
error = "incompatible file version "
+ boost::lexical_cast<std::string>(rd["file-version"].integer());
return;
}
// verify info_hash
sha1_hash hash = rd["info-hash"].string();
if (hash != info.info_hash())
{
error = "mismatching info-hash: " + boost::lexical_cast<std::string>(hash);
return;
}
// the peers
if (rd.find_key("peers"))
{
entry::list_type& peer_list = rd["peers"].list();
std::vector<tcp::endpoint> tmp_peers;
tmp_peers.reserve(peer_list.size());
for (entry::list_type::iterator i = peer_list.begin();
i != peer_list.end(); ++i)
{
tcp::endpoint a(
address::from_string((*i)["ip"].string())
, (unsigned short)(*i)["port"].integer());
tmp_peers.push_back(a);
}
peers.swap(tmp_peers);
}
// read piece map
const entry::list_type& slots = rd["slots"].list();
if ((int)slots.size() > info.num_pieces())
{
error = "file has more slots than torrent (slots: "
+ boost::lexical_cast<std::string>(slots.size()) + " size: "
+ boost::lexical_cast<std::string>(info.num_pieces()) + " )";
return;
}
std::vector<int> tmp_pieces;
tmp_pieces.reserve(slots.size());
for (entry::list_type::const_iterator i = slots.begin();
i != slots.end(); ++i)
{
int index = (int)i->integer();
if (index >= info.num_pieces() || index < -2)
{
error = "too high index number in slot map (index: "
+ boost::lexical_cast<std::string>(index) + " size: "
+ boost::lexical_cast<std::string>(info.num_pieces()) + ")";
return;
}
tmp_pieces.push_back(index);
}
// only bother to check the partial pieces if we have the same block size
// as in the fast resume data. If the blocksize has changed, then throw
// away all partial pieces.
std::vector<piece_picker::downloading_piece> tmp_unfinished;
int num_blocks_per_piece = (int)rd["blocks per piece"].integer();
if (num_blocks_per_piece == info.piece_length() / torrent_ptr->block_size())
{
// the unfinished pieces
entry::list_type& unfinished = rd["unfinished"].list();
int unfinished_size = int(unfinished.size());
block_info.resize(num_blocks_per_piece * unfinished_size);
tmp_unfinished.reserve(unfinished_size);
int index = 0;
for (entry::list_type::iterator i = unfinished.begin();
i != unfinished.end(); ++i, ++index)
{
piece_picker::downloading_piece p;
p.info = &block_info[index * num_blocks_per_piece];
p.index = (int)(*i)["piece"].integer();
if (p.index < 0 || p.index >= info.num_pieces())
{
error = "invalid piece index in unfinished piece list (index: "
+ boost::lexical_cast<std::string>(p.index) + " size: "
+ boost::lexical_cast<std::string>(info.num_pieces()) + ")";
return;
}
const std::string& bitmask = (*i)["bitmask"].string();
const int num_bitmask_bytes = std::max(num_blocks_per_piece / 8, 1);
if ((int)bitmask.size() != num_bitmask_bytes)
{
error = "invalid size of bitmask (" + boost::lexical_cast<std::string>(bitmask.size()) + ")";
return;
}
for (int j = 0; j < num_bitmask_bytes; ++j)
{
unsigned char bits = bitmask[j];
for (int k = 0; k < 8; ++k)
{
const int bit = j * 8 + k;
if (bits & (1 << k))
{
p.info[bit].finished = true;
++p.finished;
}
}
}
if (p.finished == 0) continue;
std::vector<int>::iterator slot_iter
= std::find(tmp_pieces.begin(), tmp_pieces.end(), p.index);
if (slot_iter == tmp_pieces.end())
{
// this piece is marked as unfinished
// but doesn't have any storage
error = "piece " + boost::lexical_cast<std::string>(p.index) + " is "
"marked as unfinished, but doesn't have any storage";
return;
}
assert(*slot_iter == p.index);
int slot_index = static_cast<int>(slot_iter - tmp_pieces.begin());
unsigned long adler
= torrent_ptr->filesystem().piece_crc(
slot_index
, torrent_ptr->block_size()
, p.info);
const entry& ad = (*i)["adler32"];
// crc's didn't match, don't use the resume data
if (ad.integer() != entry::integer_type(adler))
{
error = "checksum mismatch on piece "
+ boost::lexical_cast<std::string>(p.index);
return;
}
tmp_unfinished.push_back(p);
}
}
if (!torrent_ptr->verify_resume_data(rd, error))
return;
piece_map.swap(tmp_pieces);
unfinished_pieces.swap(tmp_unfinished);
}
catch (invalid_encoding&)
{
return;
}
catch (type_error&)
{
return;
}
catch (file_error&)
{
return;
}
}
}}
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