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i2pd
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send a packet to new remote lease in advance if current is about to expire

pull/2117/head
orignal 1 month ago
parent
1419745a5d
commit
8a234f70e6
2 changed files with 64 additions and 23 deletions
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  1. 81
      libi2pd/Streaming.cpp
  2. 6
      libi2pd/Streaming.h

81
libi2pd/Streaming.cpp
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@ -73,14 +73,14 @@ namespace stream @@ -73,14 +73,14 @@ namespace stream
m_LastConfirmedReceivedSequenceNumber (0), // for limit inbound speed
m_Status (eStreamStatusNew), m_IsAckSendScheduled (false), m_IsNAcked (false), m_IsFirstACK (false),
m_IsResendNeeded (false), m_IsFirstRttSample (false), m_IsSendTime (true), m_IsWinDropped (false),
m_IsTimeOutResend (false), m_IsImmediateAckRequested (false), m_LocalDestination (local),
m_IsTimeOutResend (false), m_IsImmediateAckRequested (false), m_IsRemoteLeaseChangeInProgress (false), m_LocalDestination (local),
m_RemoteLeaseSet (remote), m_ReceiveTimer (m_Service), m_SendTimer (m_Service), m_ResendTimer (m_Service),
m_AckSendTimer (m_Service), m_NumSentBytes (0), m_NumReceivedBytes (0), m_Port (port),
m_RTT (INITIAL_RTT), m_SlowRTT (INITIAL_RTT), m_SlowRTT2 (INITIAL_RTT), m_WindowSize (INITIAL_WINDOW_SIZE), m_LastWindowDropSize (0),
m_WindowDropTargetSize (0), m_WindowIncCounter (0), m_RTO (INITIAL_RTO),
m_AckDelay (local.GetOwner ()->GetStreamingAckDelay ()), m_PrevRTTSample (INITIAL_RTT),
m_Jitter (0), m_MinPacingTime (0),
m_PacingTime (INITIAL_PACING_TIME), m_PacingTimeRem (0), m_LastSendTime (0),
m_PacingTime (INITIAL_PACING_TIME), m_PacingTimeRem (0), m_LastSendTime (0), m_RemoteLeaseChangeTime (0),
m_LastACKSendTime (0), m_PacketACKInterval (1), m_PacketACKIntervalRem (0), // for limit inbound speed
m_NumResendAttempts (0), m_NumPacketsToSend (0), m_MTU (STREAMING_MTU)
{
@ -101,13 +101,13 @@ namespace stream @@ -101,13 +101,13 @@ namespace stream
m_LastConfirmedReceivedSequenceNumber (0), // for limit inbound speed
m_Status (eStreamStatusNew), m_IsAckSendScheduled (false), m_IsNAcked (false), m_IsFirstACK (false),
m_IsResendNeeded (false), m_IsFirstRttSample (false), m_IsSendTime (true), m_IsWinDropped (false),
m_IsTimeOutResend (false), m_IsImmediateAckRequested (false), m_LocalDestination (local),
m_IsTimeOutResend (false), m_IsImmediateAckRequested (false), m_IsRemoteLeaseChangeInProgress (false), m_LocalDestination (local),
m_ReceiveTimer (m_Service), m_SendTimer (m_Service), m_ResendTimer (m_Service), m_AckSendTimer (m_Service),
m_NumSentBytes (0), m_NumReceivedBytes (0), m_Port (0), m_RTT (INITIAL_RTT), m_SlowRTT (INITIAL_RTT), m_SlowRTT2 (INITIAL_RTT),
m_WindowSize (INITIAL_WINDOW_SIZE), m_LastWindowDropSize (0), m_WindowDropTargetSize (0), m_WindowIncCounter (0),
m_RTO (INITIAL_RTO), m_AckDelay (local.GetOwner ()->GetStreamingAckDelay ()),
m_PrevRTTSample (INITIAL_RTT), m_Jitter (0), m_MinPacingTime (0),
m_PacingTime (INITIAL_PACING_TIME), m_PacingTimeRem (0), m_LastSendTime (0),
m_PacingTime (INITIAL_PACING_TIME), m_PacingTimeRem (0), m_LastSendTime (0), m_RemoteLeaseChangeTime (0),
m_LastACKSendTime (0), m_PacketACKInterval (1), m_PacketACKIntervalRem (0), // for limit inbound speed
m_NumResendAttempts (0), m_NumPacketsToSend (0), m_MTU (STREAMING_MTU)
{
@ -256,6 +256,7 @@ namespace stream @@ -256,6 +256,7 @@ namespace stream
if (receivedSeqn <= m_PreviousReceivedSequenceNumber || receivedSeqn == m_LastReceivedSequenceNumber)
{
m_CurrentOutboundTunnel = m_LocalDestination.GetOwner ()->GetTunnelPool ()->GetNextOutboundTunnel (m_CurrentOutboundTunnel);
CancelRemoteLeaseChange ();
UpdateCurrentRemoteLease ();
}
m_PreviousReceivedSequenceNumber = receivedSeqn;
@ -1104,6 +1105,7 @@ namespace stream @@ -1104,6 +1105,7 @@ namespace stream
{
if (!m_RemoteLeaseSet)
{
CancelRemoteLeaseChange ();
UpdateCurrentRemoteLease ();
if (!m_RemoteLeaseSet)
{
@ -1127,9 +1129,28 @@ namespace stream @@ -1127,9 +1129,28 @@ namespace stream
}
auto ts = i2p::util::GetMillisecondsSinceEpoch ();
if (!m_CurrentRemoteLease || !m_CurrentRemoteLease->endDate || // excluded from LeaseSet
ts >= m_CurrentRemoteLease->endDate - i2p::data::LEASE_ENDDATE_THRESHOLD)
if (!m_CurrentRemoteLease || !m_CurrentRemoteLease->endDate) // excluded from LeaseSet
{
CancelRemoteLeaseChange ();
UpdateCurrentRemoteLease (true);
}
if (m_RemoteLeaseChangeTime && m_IsRemoteLeaseChangeInProgress && ts > m_RemoteLeaseChangeTime + INITIAL_RTT)
{
CancelRemoteLeaseChange ();
m_CurrentRemoteLease = m_NextRemoteLease;
HalveWindowSize ();
}
auto currentRemoteLease = m_CurrentRemoteLease;
if (!m_IsRemoteLeaseChangeInProgress && m_RemoteLeaseSet && m_CurrentRemoteLease && ts >= m_CurrentRemoteLease->endDate - i2p::data::LEASE_ENDDATE_THRESHOLD)
{
auto leases = m_RemoteLeaseSet->GetNonExpiredLeases (false);
if (leases.size () > 1)
{
m_IsRemoteLeaseChangeInProgress = true;
UpdateCurrentRemoteLease (true);
m_NextRemoteLease = m_CurrentRemoteLease;
}
}
if (m_CurrentRemoteLease && ts < m_CurrentRemoteLease->endDate + i2p::data::LEASE_ENDDATE_THRESHOLD)
{
bool freshTunnel = false;
@ -1166,6 +1187,11 @@ namespace stream @@ -1166,6 +1187,11 @@ namespace stream
msg
});
m_NumSentBytes += it->GetLength ();
if (m_IsRemoteLeaseChangeInProgress && !m_RemoteLeaseChangeTime)
{
m_RemoteLeaseChangeTime = ts;
m_CurrentRemoteLease = currentRemoteLease; // change it back before new lease is confirmed
}
}
m_CurrentOutboundTunnel->SendTunnelDataMsgs (msgs);
}
@ -1366,6 +1392,7 @@ namespace stream @@ -1366,6 +1392,7 @@ namespace stream
}
else
{
CancelRemoteLeaseChange ();
UpdateCurrentRemoteLease (); // pick another lease
LogPrint (eLogWarning, "Streaming: Resend #", m_NumResendAttempts,
", another remote lease has been selected for stream with rSID=", m_RecvStreamID, ", sSID=", m_SendStreamID);
@ -1506,22 +1533,9 @@ namespace stream @@ -1506,22 +1533,9 @@ namespace stream
LogPrint (eLogWarning, "Streaming: Remote LeaseSet not found");
m_CurrentRemoteLease = nullptr;
}
if (isLeaseChanged)
if (isLeaseChanged && !m_IsRemoteLeaseChangeInProgress)
{
// drop window to initial upon RemoteLease change
m_RTO = INITIAL_RTO;
if (m_WindowSize > INITIAL_WINDOW_SIZE)
{
m_WindowDropTargetSize = std::max (m_WindowSize/2, (float)INITIAL_WINDOW_SIZE);
m_IsWinDropped = true;
}
else
m_WindowSize = INITIAL_WINDOW_SIZE;
m_LastWindowDropSize = 0;
m_WindowIncCounter = 0;
m_IsFirstRttSample = true;
m_IsFirstACK = true;
UpdatePacingTime ();
HalveWindowSize ();
}
}
@ -1559,7 +1573,30 @@ namespace stream @@ -1559,7 +1573,30 @@ namespace stream
m_IsWinDropped = true; // don't drop window twice
UpdatePacingTime ();
}
void Stream::HalveWindowSize ()
{
m_RTO = INITIAL_RTO;
if (m_WindowSize > INITIAL_WINDOW_SIZE)
{
m_WindowDropTargetSize = std::max (m_WindowSize/2, (float)INITIAL_WINDOW_SIZE);
m_IsWinDropped = true;
}
else
m_WindowSize = INITIAL_WINDOW_SIZE;
m_LastWindowDropSize = 0;
m_WindowIncCounter = 0;
m_IsFirstRttSample = true;
m_IsFirstACK = true;
UpdatePacingTime ();
}
void Stream::CancelRemoteLeaseChange ()
{
m_RemoteLeaseChangeTime = 0;
m_IsRemoteLeaseChangeInProgress = false;
}
StreamingDestination::StreamingDestination (std::shared_ptr<i2p::client::ClientDestination> owner, uint16_t localPort, bool gzip):
m_Owner (owner), m_LocalPort (localPort), m_Gzip (gzip),
m_PendingIncomingTimer (m_Owner->GetService ()),

6
libi2pd/Streaming.h
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@ -248,6 +248,8 @@ namespace stream @@ -248,6 +248,8 @@ namespace stream
void UpdatePacingTime ();
void ProcessWindowDrop ();
void HalveWindowSize ();
void CancelRemoteLeaseChange ();
private:
@ -268,12 +270,14 @@ namespace stream @@ -268,12 +270,14 @@ namespace stream
bool m_IsWinDropped;
bool m_IsTimeOutResend;
bool m_IsImmediateAckRequested;
bool m_IsRemoteLeaseChangeInProgress;
StreamingDestination& m_LocalDestination;
std::shared_ptr<const i2p::data::IdentityEx> m_RemoteIdentity;
std::shared_ptr<const i2p::crypto::Verifier> m_TransientVerifier; // in case of offline key
std::shared_ptr<const i2p::data::LeaseSet> m_RemoteLeaseSet;
std::shared_ptr<i2p::garlic::GarlicRoutingSession> m_RoutingSession;
std::shared_ptr<const i2p::data::Lease> m_CurrentRemoteLease;
std::shared_ptr<const i2p::data::Lease> m_NextRemoteLease;
std::shared_ptr<i2p::tunnel::OutboundTunnel> m_CurrentOutboundTunnel;
std::queue<Packet *> m_ReceiveQueue;
std::set<Packet *, PacketCmp> m_SavedPackets;
@ -289,7 +293,7 @@ namespace stream @@ -289,7 +293,7 @@ namespace stream
int m_WindowIncCounter, m_RTO, m_AckDelay, m_PrevRTTSample;
double m_Jitter;
uint64_t m_MinPacingTime, m_PacingTime, m_PacingTimeRem, // microseconds
m_LastSendTime; // miliseconds
m_LastSendTime, m_RemoteLeaseChangeTime; // miliseconds
uint64_t m_LastACKSendTime, m_PacketACKInterval, m_PacketACKIntervalRem; // for limit inbound speed
int m_NumResendAttempts, m_NumPacketsToSend;
size_t m_MTU;

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