forked from premiere/premiere-libtorrent
264 lines
6.6 KiB
C++
264 lines
6.6 KiB
C++
/*
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Copyright (c) 2007, 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_BANDWIDTH_MANAGER_HPP_INCLUDED
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#define TORRENT_BANDWIDTH_MANAGER_HPP_INCLUDED
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#include <boost/intrusive_ptr.hpp>
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#ifdef TORRENT_VERBOSE_BANDWIDTH_LIMIT
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#include <fstream>
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#endif
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#include "libtorrent/socket.hpp"
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#include "libtorrent/invariant_check.hpp"
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#include "libtorrent/assert.hpp"
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#include "libtorrent/bandwidth_limit.hpp"
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#include "libtorrent/bandwidth_queue_entry.hpp"
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using boost::intrusive_ptr;
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namespace libtorrent {
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template<class PeerConnection>
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struct bandwidth_manager
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{
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bandwidth_manager(int channel
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#ifdef TORRENT_VERBOSE_BANDWIDTH_LIMIT
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, bool log = false
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#endif
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)
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: m_queued_bytes(0)
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, m_channel(channel)
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, m_abort(false)
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{
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#ifdef TORRENT_VERBOSE_BANDWIDTH_LIMIT
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if (log)
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m_log.open("bandwidth_limiter.log", std::ios::trunc);
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m_start = time_now();
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#endif
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}
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void close()
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{
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m_abort = true;
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m_queue.clear();
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m_queued_bytes = 0;
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error_code ec;
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}
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#ifdef TORRENT_DEBUG
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bool is_queued(PeerConnection const* peer) const
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{
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for (typename queue_t::const_iterator i = m_queue.begin()
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, end(m_queue.end()); i != end; ++i)
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{
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if (i->peer.get() == peer) return true;
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}
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return false;
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}
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#endif
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int queue_size() const
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{
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return m_queue.size();
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}
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int queued_bytes() const
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{
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return m_queued_bytes;
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}
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// non prioritized means that, if there's a line for bandwidth,
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// others will cut in front of the non-prioritized peers.
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// this is used by web seeds
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void request_bandwidth(intrusive_ptr<PeerConnection> const& peer
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, int blk, int priority
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, bandwidth_channel* chan1 = 0
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, bandwidth_channel* chan2 = 0
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, bandwidth_channel* chan3 = 0
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, bandwidth_channel* chan4 = 0
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, bandwidth_channel* chan5 = 0
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)
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{
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INVARIANT_CHECK;
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if (m_abort) return;
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TORRENT_ASSERT(blk > 0);
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TORRENT_ASSERT(priority > 0);
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TORRENT_ASSERT(!is_queued(peer.get()));
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bw_request<PeerConnection> bwr(peer, blk, priority);
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int i = 0;
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if (chan1 && chan1->throttle() > 0) bwr.channel[i++] = chan1;
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if (chan2 && chan2->throttle() > 0) bwr.channel[i++] = chan2;
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if (chan3 && chan3->throttle() > 0) bwr.channel[i++] = chan3;
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if (chan4 && chan4->throttle() > 0) bwr.channel[i++] = chan4;
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if (chan5 && chan5->throttle() > 0) bwr.channel[i++] = chan5;
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if (i == 0)
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{
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// the connection is not rate limited by any of its
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// bandwidth channels, or it doesn't belong to any
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// channels. There's no point in adding it to
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// the queue, just satisfy the request immediately
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bwr.peer->assign_bandwidth(m_channel, blk);
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return;
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}
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m_queued_bytes += blk;
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m_queue.push_back(bwr);
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}
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#ifdef TORRENT_DEBUG
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void check_invariant() const
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{
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int queued = 0;
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for (typename queue_t::const_iterator i = m_queue.begin()
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, end(m_queue.end()); i != end; ++i)
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{
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queued += i->request_size - i->assigned;
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}
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TORRENT_ASSERT(queued == m_queued_bytes);
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}
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#endif
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void update_quotas(time_duration const& dt)
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{
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if (m_abort) return;
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if (m_queue.empty()) return;
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INVARIANT_CHECK;
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int dt_milliseconds = total_milliseconds(dt);
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if (dt_milliseconds > 3000) dt_milliseconds = 3000;
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// for each bandwidth channel, call update_quota(dt)
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std::vector<bandwidth_channel*> channels;
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for (typename queue_t::iterator i = m_queue.begin();
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i != m_queue.end();)
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{
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if (i->peer->is_disconnecting())
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{
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m_queued_bytes -= i->request_size - i->assigned;
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// return all assigned quota to all the
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// bandwidth channels this peer belongs to
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for (int j = 0; j < 5 && i->channel[j]; ++j)
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{
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bandwidth_channel* bwc = i->channel[j];
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bwc->return_quota(i->assigned);
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}
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i = m_queue.erase(i);
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continue;
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}
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for (int j = 0; j < 5 && i->channel[j]; ++j)
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{
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bandwidth_channel* bwc = i->channel[j];
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bwc->tmp = 0;
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}
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++i;
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}
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for (typename queue_t::iterator i = m_queue.begin()
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, end(m_queue.end()); i != end; ++i)
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{
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for (int j = 0; j < 5 && i->channel[j]; ++j)
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{
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bandwidth_channel* bwc = i->channel[j];
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if (bwc->tmp == 0) channels.push_back(bwc);
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bwc->tmp += i->priority;
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TORRENT_ASSERT(i->priority > 0);
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}
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}
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for (std::vector<bandwidth_channel*>::iterator i = channels.begin()
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, end(channels.end()); i != end; ++i)
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{
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(*i)->update_quota(dt_milliseconds);
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}
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queue_t tm;
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for (typename queue_t::iterator i = m_queue.begin();
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i != m_queue.end();)
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{
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int a = i->assign_bandwidth();
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if (i->assigned == i->request_size
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|| (i->ttl <= 0 && i->assigned > 0))
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{
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a += i->request_size - i->assigned;
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TORRENT_ASSERT(i->assigned <= i->request_size);
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tm.push_back(*i);
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i = m_queue.erase(i);
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}
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else
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{
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++i;
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}
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m_queued_bytes -= a;
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}
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while (!tm.empty())
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{
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bw_request<PeerConnection>& bwr = tm.back();
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bwr.peer->assign_bandwidth(m_channel, bwr.assigned);
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tm.pop_back();
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}
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}
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// these are the consumers that want bandwidth
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typedef std::vector<bw_request<PeerConnection> > queue_t;
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queue_t m_queue;
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// the number of bytes all the requests in queue are for
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int m_queued_bytes;
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// this is the channel within the consumers
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// that bandwidth is assigned to (upload or download)
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int m_channel;
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bool m_abort;
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#ifdef TORRENT_VERBOSE_BANDWIDTH_LIMIT
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std::ofstream m_log;
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ptime m_start;
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#endif
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};
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}
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#endif
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