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@ -68,11 +68,12 @@ namespace stream
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Stream::Stream (boost::asio::io_service& service, StreamingDestination& local,
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std::shared_ptr<const i2p::data::LeaseSet> remote, int port): m_Service (service),
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m_SendStreamID (0), m_SequenceNumber (0), m_LastReceivedSequenceNumber (-1),
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m_SendStreamID (0), m_SequenceNumber (0),
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m_TunnelsChangeSequenceNumber (0), m_LastReceivedSequenceNumber (-1),
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m_Status (eStreamStatusNew), m_IsAckSendScheduled (false), m_LocalDestination (local),
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m_RemoteLeaseSet (remote), m_ReceiveTimer (m_Service), m_ResendTimer (m_Service),
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m_AckSendTimer (m_Service), m_NumSentBytes (0), m_NumReceivedBytes (0), m_Port (port),
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m_WindowSize (MIN_WINDOW_SIZE), m_RTT (INITIAL_RTT), m_RTO (INITIAL_RTO),
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m_RTT (INITIAL_RTT), m_WindowSize (MIN_WINDOW_SIZE), m_RTO (INITIAL_RTO),
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m_AckDelay (local.GetOwner ()->GetStreamingAckDelay ()),
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m_LastWindowSizeIncreaseTime (0), m_NumResendAttempts (0), m_MTU (STREAMING_MTU)
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{
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@ -81,11 +82,12 @@ namespace stream
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}
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Stream::Stream (boost::asio::io_service& service, StreamingDestination& local):
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m_Service (service), m_SendStreamID (0), m_SequenceNumber (0), m_LastReceivedSequenceNumber (-1),
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m_Service (service), m_SendStreamID (0), m_SequenceNumber (0),
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m_TunnelsChangeSequenceNumber (0), m_LastReceivedSequenceNumber (-1),
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m_Status (eStreamStatusNew), m_IsAckSendScheduled (false), m_LocalDestination (local),
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m_ReceiveTimer (m_Service), m_ResendTimer (m_Service), m_AckSendTimer (m_Service),
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m_NumSentBytes (0), m_NumReceivedBytes (0), m_Port (0), m_WindowSize (MIN_WINDOW_SIZE),
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m_RTT (INITIAL_RTT), m_RTO (INITIAL_RTO), m_AckDelay (local.GetOwner ()->GetStreamingAckDelay ()),
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m_NumSentBytes (0), m_NumReceivedBytes (0), m_Port (0), m_RTT (INITIAL_RTT),
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m_WindowSize (MIN_WINDOW_SIZE), m_RTO (INITIAL_RTO), m_AckDelay (local.GetOwner ()->GetStreamingAckDelay ()),
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m_LastWindowSizeIncreaseTime (0), m_NumResendAttempts (0), m_MTU (STREAMING_MTU)
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{
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RAND_bytes ((uint8_t *)&m_RecvStreamID, 4);
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@ -287,6 +289,8 @@ namespace stream
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m_AckSendTimer.async_wait (std::bind (&Stream::HandleAckSendTimer,
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shared_from_this (), std::placeholders::_1));
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}
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if (delayRequested >= DELAY_CHOKING)
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m_WindowSize = 1;
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}
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optionData += 2;
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}
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@ -404,6 +408,8 @@ namespace stream
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LogPrint (eLogError, "Streaming: Unexpected ackThrough=", ackThrough, " > seqn=", m_SequenceNumber);
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return;
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}
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int rttSample = INT_MAX;
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bool firstRttSample = false;
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int nackCount = packet->GetNACKCount ();
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for (auto it = m_SentPackets.begin (); it != m_SentPackets.end ();)
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{
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@ -427,41 +433,51 @@ namespace stream
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}
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}
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auto sentPacket = *it;
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uint64_t rtt = ts - sentPacket->sendTime;
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if(ts < sentPacket->sendTime)
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int64_t rtt = (int64_t)ts - (int64_t)sentPacket->sendTime;
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if (rtt < 0)
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LogPrint (eLogError, "Streaming: Packet ", seqn, "sent from the future, sendTime=", sentPacket->sendTime);
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if (!seqn)
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{
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LogPrint(eLogError, "Streaming: Packet ", seqn, "sent from the future, sendTime=", sentPacket->sendTime);
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rtt = 1;
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firstRttSample = true;
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rttSample = rtt < 0 ? 1 : rtt;
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}
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if (seqn)
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m_RTT = std::round (RTT_EWMA_ALPHA * m_RTT + (1.0 - RTT_EWMA_ALPHA) * rtt);
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else
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m_RTT = rtt;
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m_RTO = m_RTT*1.5; // TODO: implement it better
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else if (!sentPacket->resent && seqn > m_TunnelsChangeSequenceNumber && rtt >= 0)
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rttSample = std::min (rttSample, (int)rtt);
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LogPrint (eLogDebug, "Streaming: Packet ", seqn, " acknowledged rtt=", rtt, " sentTime=", sentPacket->sendTime);
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m_SentPackets.erase (it++);
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m_LocalDestination.DeletePacket (sentPacket);
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acknowledged = true;
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if (m_WindowSize < WINDOW_SIZE)
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m_WindowSize++; // slow start
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else
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{
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// linear growth
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if (ts > m_LastWindowSizeIncreaseTime + m_RTT)
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{
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m_WindowSize++;
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if (m_WindowSize > MAX_WINDOW_SIZE) m_WindowSize = MAX_WINDOW_SIZE;
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m_LastWindowSizeIncreaseTime = ts;
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}
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}
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if (!seqn && m_RoutingSession) // first message confirmed
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m_RoutingSession->SetSharedRoutingPath (
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std::make_shared<i2p::garlic::GarlicRoutingPath> (
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i2p::garlic::GarlicRoutingPath{m_CurrentOutboundTunnel, m_CurrentRemoteLease, m_RTT, 0, 0}));
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}
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else
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break;
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}
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if (rttSample != INT_MAX)
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{
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if (firstRttSample)
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m_RTT = rttSample;
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else
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m_RTT = RTT_EWMA_ALPHA * rttSample + (1.0 - RTT_EWMA_ALPHA) * m_RTT;
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bool wasInitial = m_RTO == INITIAL_RTO;
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m_RTO = std::max (MIN_RTO, (int)(m_RTT * 1.5)); // TODO: implement it better
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if (wasInitial)
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ScheduleResend ();
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}
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if (acknowledged && m_WindowSize >= WINDOW_SIZE)
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{
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// linear growth
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if (ts > m_LastWindowSizeIncreaseTime + m_RTT)
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{
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m_WindowSize++;
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if (m_WindowSize > MAX_WINDOW_SIZE) m_WindowSize = MAX_WINDOW_SIZE;
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m_LastWindowSizeIncreaseTime = ts;
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}
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}
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if (firstRttSample && m_RoutingSession)
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m_RoutingSession->SetSharedRoutingPath (
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std::make_shared<i2p::garlic::GarlicRoutingPath> (
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i2p::garlic::GarlicRoutingPath{m_CurrentOutboundTunnel, m_CurrentRemoteLease, (int)m_RTT, 0, 0}));
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if (m_SentPackets.empty ())
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m_ResendTimer.cancel ();
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if (acknowledged)
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@ -677,6 +693,7 @@ namespace stream
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htobe32buf (packet + size, lastReceivedSeqn);
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size += 4; // ack Through
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uint8_t numNacks = 0;
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bool choking = false;
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if (lastReceivedSeqn > m_LastReceivedSequenceNumber)
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{
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// fill NACKs
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@ -688,7 +705,8 @@ namespace stream
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if (numNacks + (seqn - nextSeqn) >= 256)
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{
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LogPrint (eLogError, "Streaming: Number of NACKs exceeds 256. seqn=", seqn, " nextSeqn=", nextSeqn);
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htobe32buf (packet + 12, nextSeqn); // change ack Through
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htobe32buf (packet + 12, nextSeqn - 1); // change ack Through back
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choking = true;
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break;
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}
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for (uint32_t i = nextSeqn; i < seqn; i++)
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@ -710,10 +728,17 @@ namespace stream
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size++; // NACK count
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}
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packet[size] = 0;
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size++; // resend delay
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htobuf16 (packet + size, 0); // no flags set
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size++; // resend delay
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htobuf16 (packet + size, choking ? PACKET_FLAG_DELAY_REQUESTED : 0); // no flags set or delay
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size += 2; // flags
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htobuf16 (packet + size, 0); // no options
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if (choking)
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{
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htobuf16 (packet + size, 2); // 2 bytes delay interval
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htobuf16 (packet + size + 2, DELAY_CHOKING); // set choking interval
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size += 2;
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}
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else
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htobuf16 (packet + size, 0); // no options
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size += 2; // options size
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p.len = size;
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@ -881,7 +906,7 @@ namespace stream
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m_CurrentOutboundTunnel = routingPath->outboundTunnel;
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m_CurrentRemoteLease = routingPath->remoteLease;
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m_RTT = routingPath->rtt;
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m_RTO = m_RTT*1.5; // TODO: implement it better
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m_RTO = std::max (MIN_RTO, (int)(m_RTT * 1.5)); // TODO: implement it better
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}
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}
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@ -891,20 +916,32 @@ namespace stream
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UpdateCurrentRemoteLease (true);
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if (m_CurrentRemoteLease && ts < m_CurrentRemoteLease->endDate + i2p::data::LEASE_ENDDATE_THRESHOLD)
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{
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bool freshTunnel = false;
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if (!m_CurrentOutboundTunnel)
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{
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auto leaseRouter = i2p::data::netdb.FindRouter (m_CurrentRemoteLease->tunnelGateway);
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m_CurrentOutboundTunnel = m_LocalDestination.GetOwner ()->GetTunnelPool ()->GetNextOutboundTunnel (nullptr,
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leaseRouter ? leaseRouter->GetCompatibleTransports (false) : (i2p::data::RouterInfo::CompatibleTransports)i2p::data::RouterInfo::eAllTransports);
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freshTunnel = true;
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}
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else if (!m_CurrentOutboundTunnel->IsEstablished ())
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{
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auto oldOutboundTunnel = m_CurrentOutboundTunnel;
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m_CurrentOutboundTunnel = m_LocalDestination.GetOwner ()->GetTunnelPool ()->GetNewOutboundTunnel (m_CurrentOutboundTunnel);
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if (m_CurrentOutboundTunnel && oldOutboundTunnel->GetEndpointIdentHash() != m_CurrentOutboundTunnel->GetEndpointIdentHash())
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freshTunnel = true;
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}
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if (!m_CurrentOutboundTunnel)
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{
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LogPrint (eLogError, "Streaming: No outbound tunnels in the pool, sSID=", m_SendStreamID);
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m_CurrentRemoteLease = nullptr;
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return;
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}
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if (freshTunnel)
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{
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m_RTO = INITIAL_RTO;
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m_TunnelsChangeSequenceNumber = m_SequenceNumber; // should be determined more precisely
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}
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std::vector<i2p::tunnel::TunnelMessageBlock> msgs;
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for (const auto& it: packets)
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@ -936,10 +973,10 @@ namespace stream
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if (m_RoutingSession->IsLeaseSetNonConfirmed ())
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{
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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if (ts > m_RoutingSession->GetLeaseSetSubmissionTime () + i2p::garlic::LEASET_CONFIRMATION_TIMEOUT)
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if (ts > m_RoutingSession->GetLeaseSetSubmissionTime () + i2p::garlic::LEASESET_CONFIRMATION_TIMEOUT)
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{
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// LeaseSet was not confirmed, should try other tunnels
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LogPrint (eLogWarning, "Streaming: LeaseSet was not confirmed in ", i2p::garlic::LEASET_CONFIRMATION_TIMEOUT, " milliseconds. Trying to resubmit");
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LogPrint (eLogWarning, "Streaming: LeaseSet was not confirmed in ", i2p::garlic::LEASESET_CONFIRMATION_TIMEOUT, " milliseconds. Trying to resubmit");
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m_RoutingSession->SetSharedRoutingPath (nullptr);
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m_CurrentOutboundTunnel = nullptr;
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m_CurrentRemoteLease = nullptr;
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@ -989,6 +1026,7 @@ namespace stream
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{
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if (ts >= it->sendTime + m_RTO)
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{
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it->resent = true;
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it->sendTime = ts;
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packets.push_back (it);
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}
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@ -998,31 +1036,31 @@ namespace stream
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if (packets.size () > 0)
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{
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m_NumResendAttempts++;
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m_RTO *= 2;
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switch (m_NumResendAttempts)
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if (m_NumResendAttempts == 1 && m_RTO != INITIAL_RTO)
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{
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case 1: // congestion avoidance
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m_WindowSize -= (m_WindowSize + WINDOW_SIZE_DROP_FRACTION) / WINDOW_SIZE_DROP_FRACTION; // adjustment >= 1
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if (m_WindowSize < MIN_WINDOW_SIZE) m_WindowSize = MIN_WINDOW_SIZE;
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break;
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case 2:
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m_RTO = INITIAL_RTO; // drop RTO to initial upon tunnels pair change first time
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#if (__cplusplus >= 201703L) // C++ 17 or higher
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[[fallthrough]];
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#endif
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// no break here
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case 4:
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if (m_RoutingSession) m_RoutingSession->SetSharedRoutingPath (nullptr);
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UpdateCurrentRemoteLease (); // pick another lease
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LogPrint (eLogWarning, "Streaming: Another remote lease has been selected for stream with rSID=", m_RecvStreamID, ", sSID=", m_SendStreamID);
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break;
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case 3:
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// congestion avoidance
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m_RTO *= 2;
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m_WindowSize -= (m_WindowSize + WINDOW_SIZE_DROP_FRACTION) / WINDOW_SIZE_DROP_FRACTION; // adjustment >= 1
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if (m_WindowSize < MIN_WINDOW_SIZE) m_WindowSize = MIN_WINDOW_SIZE;
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}
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else
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{
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m_TunnelsChangeSequenceNumber = m_SequenceNumber;
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m_RTO = INITIAL_RTO; // drop RTO to initial upon tunnels pair change
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if (m_RoutingSession) m_RoutingSession->SetSharedRoutingPath (nullptr);
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if (m_NumResendAttempts & 1)
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{
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// pick another outbound tunnel
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if (m_RoutingSession) m_RoutingSession->SetSharedRoutingPath (nullptr);
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m_CurrentOutboundTunnel = m_LocalDestination.GetOwner ()->GetTunnelPool ()->GetNextOutboundTunnel (m_CurrentOutboundTunnel);
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LogPrint (eLogWarning, "Streaming: Another outbound tunnel has been selected for stream with sSID=", m_SendStreamID);
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break;
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default: ;
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|
|
LogPrint (eLogWarning, "Streaming: Resend #", m_NumResendAttempts,
|
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|
|
", another outbound tunnel has been selected for stream with sSID=", m_SendStreamID);
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}
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else
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{
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UpdateCurrentRemoteLease (); // pick another lease
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LogPrint (eLogWarning, "Streaming: Resend #", m_NumResendAttempts,
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", another remote lease has been selected for stream with rSID=", m_RecvStreamID, ", sSID=", m_SendStreamID);
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}
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}
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SendPackets (packets);
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}
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@ -1056,9 +1094,13 @@ namespace stream
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{
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if (m_RoutingSession && m_RoutingSession->IsLeaseSetNonConfirmed ())
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{
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// seems something went wrong and we should re-select tunnels
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m_CurrentOutboundTunnel = nullptr;
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m_CurrentRemoteLease = nullptr;
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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if (ts > m_RoutingSession->GetLeaseSetSubmissionTime () + i2p::garlic::LEASESET_CONFIRMATION_TIMEOUT)
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{
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// seems something went wrong and we should re-select tunnels
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m_CurrentOutboundTunnel = nullptr;
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m_CurrentRemoteLease = nullptr;
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}
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}
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SendQuickAck ();
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}
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orignal
4 weeks ago
committed by
GitHub