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Merge pull request #2048 from Vort/stream_resends

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Reset stream RTO if outbound tunnel was changed
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orignal 2024-04-08 06:53:08 -04:00 committed by GitHub
commit 04bccedd9b
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2 changed files with 35 additions and 26 deletions
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59
libi2pd/Streaming.cpp
View File

@ -916,20 +916,32 @@ namespace stream
UpdateCurrentRemoteLease (true);
if (m_CurrentRemoteLease && ts < m_CurrentRemoteLease->endDate + i2p::data::LEASE_ENDDATE_THRESHOLD)
{
bool freshTunnel = false;
if (!m_CurrentOutboundTunnel)
{
auto leaseRouter = i2p::data::netdb.FindRouter (m_CurrentRemoteLease->tunnelGateway);
m_CurrentOutboundTunnel = m_LocalDestination.GetOwner ()->GetTunnelPool ()->GetNextOutboundTunnel (nullptr,
leaseRouter ? leaseRouter->GetCompatibleTransports (false) : (i2p::data::RouterInfo::CompatibleTransports)i2p::data::RouterInfo::eAllTransports);
freshTunnel = true;
}
else if (!m_CurrentOutboundTunnel->IsEstablished ())
{
auto oldOutboundTunnel = m_CurrentOutboundTunnel;
m_CurrentOutboundTunnel = m_LocalDestination.GetOwner ()->GetTunnelPool ()->GetNewOutboundTunnel (m_CurrentOutboundTunnel);
if (m_CurrentOutboundTunnel && oldOutboundTunnel->GetEndpointIdentHash() != m_CurrentOutboundTunnel->GetEndpointIdentHash())
freshTunnel = true;
}
if (!m_CurrentOutboundTunnel)
{
LogPrint (eLogError, "Streaming: No outbound tunnels in the pool, sSID=", m_SendStreamID);
m_CurrentRemoteLease = nullptr;
return;
}
if (freshTunnel)
{
m_RTO = INITIAL_RTO;
m_TunnelsChangeSequenceNumber = m_SequenceNumber; // should be determined more precisely
}
std::vector<i2p::tunnel::TunnelMessageBlock> msgs;
for (const auto& it: packets)
@ -1024,34 +1036,31 @@ namespace stream
if (packets.size () > 0)
{
m_NumResendAttempts++;
if (m_RTO != INITIAL_RTO)
m_RTO *= 2;
switch (m_NumResendAttempts)
if (m_NumResendAttempts == 1 && m_RTO != INITIAL_RTO)
{
case 1: // congestion avoidance
m_WindowSize -= (m_WindowSize + WINDOW_SIZE_DROP_FRACTION) / WINDOW_SIZE_DROP_FRACTION; // adjustment >= 1
if (m_WindowSize < MIN_WINDOW_SIZE) m_WindowSize = MIN_WINDOW_SIZE;
break;
case 2:
m_TunnelsChangeSequenceNumber = m_SequenceNumber;
m_RTO = INITIAL_RTO; // drop RTO to initial upon tunnels pair change first time
#if (__cplusplus >= 201703L) // C++ 17 or higher
[[fallthrough]];
#endif
// no break here
case 4:
if (m_RoutingSession) m_RoutingSession->SetSharedRoutingPath (nullptr);
UpdateCurrentRemoteLease (); // pick another lease
LogPrint (eLogWarning, "Streaming: Another remote lease has been selected for stream with rSID=", m_RecvStreamID, ", sSID=", m_SendStreamID);
break;
case 3:
// congestion avoidance
m_RTO *= 2;
m_WindowSize -= (m_WindowSize + WINDOW_SIZE_DROP_FRACTION) / WINDOW_SIZE_DROP_FRACTION; // adjustment >= 1
if (m_WindowSize < MIN_WINDOW_SIZE) m_WindowSize = MIN_WINDOW_SIZE;
}
else
{
m_TunnelsChangeSequenceNumber = m_SequenceNumber;
m_RTO = INITIAL_RTO; // drop RTO to initial upon tunnels pair change
if (m_RoutingSession) m_RoutingSession->SetSharedRoutingPath (nullptr);
if (m_NumResendAttempts & 1)
{
// pick another outbound tunnel
m_TunnelsChangeSequenceNumber = m_SequenceNumber;
if (m_RoutingSession) m_RoutingSession->SetSharedRoutingPath (nullptr);
m_CurrentOutboundTunnel = m_LocalDestination.GetOwner ()->GetTunnelPool ()->GetNextOutboundTunnel (m_CurrentOutboundTunnel);
LogPrint (eLogWarning, "Streaming: Another outbound tunnel has been selected for stream with sSID=", m_SendStreamID);
break;
default: ;
LogPrint (eLogWarning, "Streaming: Resend #", m_NumResendAttempts,
", another outbound tunnel has been selected for stream with sSID=", m_SendStreamID);
}
else
{
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);
}
}
SendPackets (packets);
}

2
libi2pd/Streaming.h
View File

@ -52,7 +52,7 @@ namespace stream
const size_t STREAMING_MTU_RATCHETS = 1812;
const size_t MAX_PACKET_SIZE = 4096;
const size_t COMPRESSION_THRESHOLD_SIZE = 66;
const int MAX_NUM_RESEND_ATTEMPTS = 6;
const int MAX_NUM_RESEND_ATTEMPTS = 9;
const int WINDOW_SIZE = 6; // in messages
const int MIN_WINDOW_SIZE = 1;
const int MAX_WINDOW_SIZE = 128;