src/network/connectionthreads.cpp


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/*
Minetest
Copyright (C) 2013-2017 celeron55, Perttu Ahola <celeron55@gmail.com>
Copyright (C) 2017 celeron55, Loic Blot <loic.blot@unix-experience.fr>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "connectionthreads.h"
#include "log.h"
#include "profiler.h"
#include "settings.h"
#include "network/networkpacket.h"
#include "util/serialize.h"

namespace con
{

/******************************************************************************/
/* defines used for debugging and profiling                                   */
/******************************************************************************/
#ifdef NDEBUG
#define LOG(a) a
#define PROFILE(a)
#undef DEBUG_CONNECTION_KBPS
#else
/* this mutex is used to achieve log message consistency */
std::mutex log_conthread_mutex;
#define LOG(a)                                                                \
	{                                                                         \
	MutexAutoLock loglock(log_conthread_mutex);                                 \
	a;                                                                        \
	}
#define PROFILE(a) a
//#define DEBUG_CONNECTION_KBPS
#undef DEBUG_CONNECTION_KBPS
#endif

/* maximum number of retries for reliable packets */
#define MAX_RELIABLE_RETRY 5

#define WINDOW_SIZE 5

static session_t readPeerId(u8 *packetdata)
{
	return readU16(&packetdata[4]);
}
static u8 readChannel(u8 *packetdata)
{
	return readU8(&packetdata[6]);
}

/******************************************************************************/
/* Connection Threads                                                         */
/******************************************************************************/

ConnectionSendThread::ConnectionSendThread(unsigned int max_packet_size,
	float timeout) :
	Thread("ConnectionSend"),
	m_max_packet_size(max_packet_size),
	m_timeout(timeout),
	m_max_data_packets_per_iteration(g_settings->getU16("max_packets_per_iteration"))
{
}

void *ConnectionSendThread::run()
{
	assert(m_connection);

	LOG(dout_con << m_connection->getDesc()
		<< "ConnectionSend thread started" << std::endl);

	u64 curtime = porting::getTimeMs();
	u64 lasttime = curtime;

	PROFILE(std::stringstream ThreadIdentifier);
	PROFILE(ThreadIdentifier << "ConnectionSend: [" << m_connection->getDesc() << "]");

	/* if stop is requested don't stop immediately but try to send all        */
	/* packets first */
	while (!stopRequested() || packetsQueued()) {
		BEGIN_DEBUG_EXCEPTION_HANDLER
		PROFILE(ScopeProfiler sp(g_profiler, ThreadIdentifier.str(), SPT_AVG));

		m_iteration_packets_avaialble = m_max_data_packets_per_iteration;

		/* wait for trigger or timeout */
		m_send_sleep_semaphore.wait(50);

		/* remove all triggers */
		while (m_send_sleep_semaphore.wait(0)) {
		}

		lasttime = curtime;
		curtime = porting::getTimeMs();
		float dtime = CALC_DTIME(lasttime, curtime);

		/* first do all the reliable stuff */
		runTimeouts(dtime);

		/* translate commands to packets */
		ConnectionCommand c = m_connection->m_command_queue.pop_frontNoEx(0);
		while (c.type != CONNCMD_NONE) {
			if (c.reliable)
				processReliableCommand(c);
			else
				processNonReliableCommand(c);

			c = m_connection->m_command_queue.pop_frontNoEx(0);
		}

		/* send non reliable packets */
		sendPackets(dtime);

		END_DEBUG_EXCEPTION_HANDLER
	}

	PROFILE(g_profiler->remove(ThreadIdentifier.str()));
	return NULL;
}

void ConnectionSendThread::Trigger()
{
	m_send_sleep_semaphore.post();
}

bool ConnectionSendThread::packetsQueued()
{
	std::list<session_t> peerIds = m_connection->getPeerIDs();

	if (!m_outgoing_queue.empty() && !peerIds.empty())
		return true;

	for (session_t peerId : peerIds) {
		PeerHelper peer = m_connection->getPeerNoEx(peerId);

		if (!peer)
			continue;

		if (dynamic_cast<UDPPeer *>(&peer) == 0)
			continue;

		for (Channel &channel : (dynamic_cast<UDPPeer *>(&peer))->channels) {
			if (!channel.queued_commands.empty()) {
				return true;
			}
		}
	}


	return false;
}

void ConnectionSendThread::runTimeouts(float dtime)
{
	std::list<session_t> timeouted_peers;
	std::list<session_t> peerIds = m_connection->getPeerIDs();

	for (session_t &peerId : peerIds) {
		PeerHelper peer = m_connection->getPeerNoEx(peerId);

		if (!peer)
			continue;

		UDPPeer *udpPeer = dynamic_cast<UDPPeer *>(&peer);
		if (!udpPeer)
			continue;

		PROFILE(std::stringstream peerIdentifier);
		PROFILE(peerIdentifier << "runTimeouts[" << m_connection->getDesc()
			<< ";" << peerId << ";RELIABLE]");
		PROFILE(ScopeProfiler
		peerprofiler(g_profiler, peerIdentifier.str(), SPT_AVG));

		SharedBuffer<u8> data(2); // data for sending ping, required here because of goto

		/*
			Check peer timeout
		*/
		if (peer->isTimedOut(m_timeout)) {
			infostream << m_connection->getDesc()
				<< "RunTimeouts(): Peer " << peer->id
				<< " has timed out."
				<< " (source=peer->timeout_counter)"
				<< std::endl;
			// Add peer to the list
			timeouted_peers.push_back(peer->id);
			// Don't bother going through the buffers of this one
			continue;
		}

		float resend_timeout = udpPeer->getResendTimeout();
		bool retry_count_exceeded = false;
		for (Channel &channel : udpPeer->channels) {
			std::list<BufferedPacket> timed_outs;

			if (udpPeer->getLegacyPeer())
				channel.setWindowSize(WINDOW_SIZE);

			// Remove timed out incomplete unreliable split packets
			channel.incoming_splits.removeUnreliableTimedOuts(dtime, m_timeout);

			// Increment reliable packet times
			channel.outgoing_reliables_sent.incrementTimeouts(dtime);

			unsigned int numpeers = m_connection->m_peers.size();

			if (numpeers == 0)
				return;