premiere-libtorrent/simulation/test_optimistic_unchoke.cpp

/*

Copyright (c) 2016, Arvid Norberg
All rights reserved.

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    * Redistributions of source code must retain the above copyright
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    * Redistributions in binary form must reproduce the above copyright
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      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
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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*/

#include "setup_swarm.hpp"
#include "test.hpp"
#include "create_torrent.hpp"
#include "bittorrent_peer.hpp"
#include "settings.hpp"
#include "print_alerts.hpp"

#include "libtorrent/alert.hpp"
#include "libtorrent/alert_types.hpp"
#include "libtorrent/session.hpp"
#include "libtorrent/session_stats.hpp"
#include "libtorrent/io_service.hpp"
#include "libtorrent/torrent_info.hpp"
#include "libtorrent/deadline_timer.hpp"

#include <boost/bind.hpp>
#include <boost/make_shared.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/ref.hpp>

struct choke_state
{
	choke_state() : unchoke_duration(lt::seconds(0)), choked(true) {}
	lt::time_duration unchoke_duration;
	lt::time_point last_unchoke;
	bool choked;
};

TORRENT_TEST(optimistic_unchoke)
{
	int const num_nodes = 20;
	lt::time_duration const test_duration = libtorrent::seconds(1201);

	dsl_config network_cfg;
	sim::simulation sim{network_cfg};

	io_service ios(sim, addr("50.1.0.0"));
	lt::time_point start_time(lt::clock_type::now());

	libtorrent::add_torrent_params atp = create_torrent(0);
	atp.flags &= ~add_torrent_params::flag_auto_managed;
	atp.flags &= ~add_torrent_params::flag_paused;

	lt::settings_pack pack = settings();
	// only allow an optimistic unchoke slot
	pack.set_int(settings_pack::unchoke_slots_limit, 1);
	pack.set_int(settings_pack::num_optimistic_unchoke_slots, 1);

	std::vector<choke_state> peer_choke_state(num_nodes);

	session_proxy proxy;

	boost::shared_ptr<lt::session> ses = boost::make_shared<lt::session>(
		boost::ref(pack), boost::ref(ios));
	ses->async_add_torrent(atp);

	std::vector<boost::shared_ptr<sim::asio::io_service> > io_service;
	std::vector<boost::shared_ptr<peer_conn> > peers;

	ses->set_alert_notify([&]() {
		// this function is called inside libtorrent and we cannot perform work
		// immediately in it. We have to notify the outside to pull all the alerts
		ios.post(boost::bind(&print_alerts, ses.get(), start_time));
	});

	lt::deadline_timer timer(ios);
	timer.expires_from_now(libtorrent::seconds(2));
	timer.async_wait([&](error_code const& ec)
	{
		for (int i = 0; i < num_nodes; ++i)
		{
			// create a new io_service
			char ep[30];
			snprintf(ep, sizeof(ep), "50.0.%d.%d", (i + 1) >> 8, (i + 1) & 0xff);
			io_service.push_back(boost::make_shared<sim::asio::io_service>(
				boost::ref(sim), addr(ep)));
			peers.push_back(boost::make_shared<peer_conn>(boost::ref(*io_service.back())
				, [&,i](int msg, char const* bug, int len)
				{
					choke_state& cs = peer_choke_state[i];
					if (msg == 0)
					{
						// choke
						if (!cs.choked)
						{
							cs.choked = true;
							cs.unchoke_duration += lt::clock_type::now() - cs.last_unchoke;
						}
					}
					else if (msg == 1)
					{
						// unchoke
						if (cs.choked)
						{
							cs.choked = false;
							cs.last_unchoke = lt::clock_type::now();
						}
					}
					else
					{
						return;
					}

					char const* msg_str[] = {"choke", "unchoke"};

					lt::time_duration d = lt::clock_type::now() - start_time;
					boost::uint32_t millis = lt::duration_cast<lt::milliseconds>(d).count();
					printf("\x1b[35m%4d.%03d: [%d] %s (%d ms)\x1b[0m\n"
						, millis / 1000, millis % 1000, i, msg_str[msg]
						, int(lt::duration_cast<lt::milliseconds>(cs.unchoke_duration).count()));
				}
				, *atp.ti
				, tcp::endpoint(addr("50.1.0.0"), 6881)
				, peer_conn::idle));
		}
	});

	lt::deadline_timer end_timer(ios);
	timer.expires_from_now(test_duration);
	timer.async_wait([&](error_code const& ec)
	{
		for (auto& p : peers)
		{
			p->abort();
		}
		proxy = ses->abort();
		ses.reset();
	});

	sim.run();

	boost::int64_t const duration_ms = lt::duration_cast<lt::milliseconds>(test_duration).count();
	boost::int64_t const average_unchoke_time = duration_ms / num_nodes;
	printf("EXPECT: %" PRId64 " ms\n", average_unchoke_time);
	for (auto const& cs : peer_choke_state)
	{
		boost::int64_t unchoke_duration = lt::duration_cast<lt::milliseconds>(cs.unchoke_duration).count();
		printf("%" PRId64 " ms\n", unchoke_duration);
		TEST_CHECK(std::abs(unchoke_duration - average_unchoke_time) < 1000);
	}
}