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651 lines
19 KiB
651 lines
19 KiB
/* |
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* Copyright (c) 2013-2021, The PurpleI2P Project |
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* |
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* This file is part of Purple i2pd project and licensed under BSD3 |
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* |
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* See full license text in LICENSE file at top of project tree |
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*/ |
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#include <algorithm> |
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#include <random> |
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#include "I2PEndian.h" |
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#include "Crypto.h" |
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#include "Tunnel.h" |
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#include "NetDb.hpp" |
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#include "Timestamp.h" |
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#include "Garlic.h" |
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#include "Transports.h" |
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#include "Log.h" |
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#include "Tunnel.h" |
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#include "TunnelPool.h" |
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#include "Destination.h" |
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namespace i2p |
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{ |
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namespace tunnel |
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{ |
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TunnelPool::TunnelPool (int numInboundHops, int numOutboundHops, int numInboundTunnels, int numOutboundTunnels): |
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m_NumInboundHops (numInboundHops), m_NumOutboundHops (numOutboundHops), |
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m_NumInboundTunnels (numInboundTunnels), m_NumOutboundTunnels (numOutboundTunnels), |
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m_IsActive (true), m_CustomPeerSelector(nullptr) |
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{ |
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if (m_NumInboundTunnels > TUNNEL_POOL_MAX_INBOUND_TUNNELS_QUANTITY) |
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m_NumInboundTunnels = TUNNEL_POOL_MAX_INBOUND_TUNNELS_QUANTITY; |
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if (m_NumOutboundTunnels > TUNNEL_POOL_MAX_OUTBOUND_TUNNELS_QUANTITY) |
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m_NumOutboundTunnels = TUNNEL_POOL_MAX_OUTBOUND_TUNNELS_QUANTITY; |
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m_NextManageTime = i2p::util::GetSecondsSinceEpoch () + rand () % TUNNEL_POOL_MANAGE_INTERVAL; |
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} |
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TunnelPool::~TunnelPool () |
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{ |
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DetachTunnels (); |
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} |
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void TunnelPool::SetExplicitPeers (std::shared_ptr<std::vector<i2p::data::IdentHash> > explicitPeers) |
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{ |
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m_ExplicitPeers = explicitPeers; |
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if (m_ExplicitPeers) |
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{ |
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int size = m_ExplicitPeers->size (); |
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if (m_NumInboundHops > size) |
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{ |
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m_NumInboundHops = size; |
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LogPrint (eLogInfo, "Tunnels: Inbound tunnel length has beed adjusted to ", size, " for explicit peers"); |
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} |
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if (m_NumOutboundHops > size) |
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{ |
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m_NumOutboundHops = size; |
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LogPrint (eLogInfo, "Tunnels: Outbound tunnel length has beed adjusted to ", size, " for explicit peers"); |
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} |
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m_NumInboundTunnels = 1; |
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m_NumOutboundTunnels = 1; |
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} |
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} |
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void TunnelPool::DetachTunnels () |
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{ |
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{ |
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
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for (auto& it: m_InboundTunnels) |
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it->SetTunnelPool (nullptr); |
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m_InboundTunnels.clear (); |
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} |
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{ |
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
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for (auto& it: m_OutboundTunnels) |
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it->SetTunnelPool (nullptr); |
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m_OutboundTunnels.clear (); |
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} |
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m_Tests.clear (); |
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} |
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bool TunnelPool::Reconfigure(int inHops, int outHops, int inQuant, int outQuant) |
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{ |
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if( inHops >= 0 && outHops >= 0 && inQuant > 0 && outQuant > 0) |
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{ |
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m_NumInboundHops = inHops; |
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m_NumOutboundHops = outHops; |
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m_NumInboundTunnels = inQuant; |
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m_NumOutboundTunnels = outQuant; |
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return true; |
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} |
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return false; |
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} |
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void TunnelPool::TunnelCreated (std::shared_ptr<InboundTunnel> createdTunnel) |
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{ |
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if (!m_IsActive) return; |
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{ |
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
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m_InboundTunnels.insert (createdTunnel); |
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} |
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if (m_LocalDestination) |
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m_LocalDestination->SetLeaseSetUpdated (); |
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} |
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void TunnelPool::TunnelExpired (std::shared_ptr<InboundTunnel> expiredTunnel) |
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{ |
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if (expiredTunnel) |
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{ |
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expiredTunnel->SetTunnelPool (nullptr); |
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for (auto& it: m_Tests) |
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if (it.second.second == expiredTunnel) it.second.second = nullptr; |
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
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m_InboundTunnels.erase (expiredTunnel); |
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} |
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} |
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void TunnelPool::TunnelCreated (std::shared_ptr<OutboundTunnel> createdTunnel) |
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{ |
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if (!m_IsActive) return; |
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{ |
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
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m_OutboundTunnels.insert (createdTunnel); |
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} |
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} |
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void TunnelPool::TunnelExpired (std::shared_ptr<OutboundTunnel> expiredTunnel) |
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{ |
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if (expiredTunnel) |
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{ |
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expiredTunnel->SetTunnelPool (nullptr); |
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for (auto& it: m_Tests) |
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if (it.second.first == expiredTunnel) it.second.first = nullptr; |
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
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m_OutboundTunnels.erase (expiredTunnel); |
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} |
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} |
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std::vector<std::shared_ptr<InboundTunnel> > TunnelPool::GetInboundTunnels (int num) const |
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{ |
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std::vector<std::shared_ptr<InboundTunnel> > v; |
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int i = 0; |
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
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for (const auto& it : m_InboundTunnels) |
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{ |
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if (i >= num) break; |
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if (it->IsEstablished ()) |
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{ |
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v.push_back (it); |
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i++; |
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} |
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} |
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return v; |
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} |
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std::shared_ptr<OutboundTunnel> TunnelPool::GetNextOutboundTunnel (std::shared_ptr<OutboundTunnel> excluded) const |
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{ |
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
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return GetNextTunnel (m_OutboundTunnels, excluded); |
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} |
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std::shared_ptr<InboundTunnel> TunnelPool::GetNextInboundTunnel (std::shared_ptr<InboundTunnel> excluded) const |
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{ |
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
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return GetNextTunnel (m_InboundTunnels, excluded); |
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} |
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template<class TTunnels> |
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typename TTunnels::value_type TunnelPool::GetNextTunnel (TTunnels& tunnels, typename TTunnels::value_type excluded) const |
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{ |
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if (tunnels.empty ()) return nullptr; |
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uint32_t ind = rand () % (tunnels.size ()/2 + 1), i = 0; |
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typename TTunnels::value_type tunnel = nullptr; |
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for (const auto& it: tunnels) |
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{ |
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if (it->IsEstablished () && it != excluded) |
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{ |
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if(HasLatencyRequirement() && it->LatencyIsKnown() && !it->LatencyFitsRange(m_MinLatency, m_MaxLatency)) { |
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i ++; |
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continue; |
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} |
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tunnel = it; |
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i++; |
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} |
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if (i > ind && tunnel) break; |
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} |
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if(HasLatencyRequirement() && !tunnel) { |
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ind = rand () % (tunnels.size ()/2 + 1), i = 0; |
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for (const auto& it: tunnels) |
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{ |
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if (it->IsEstablished () && it != excluded) |
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{ |
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tunnel = it; |
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i++; |
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} |
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if (i > ind && tunnel) break; |
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} |
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} |
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if (!tunnel && excluded && excluded->IsEstablished ()) tunnel = excluded; |
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return tunnel; |
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} |
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std::shared_ptr<OutboundTunnel> TunnelPool::GetNewOutboundTunnel (std::shared_ptr<OutboundTunnel> old) const |
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{ |
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if (old && old->IsEstablished ()) return old; |
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std::shared_ptr<OutboundTunnel> tunnel; |
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if (old) |
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{ |
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
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for (const auto& it: m_OutboundTunnels) |
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if (it->IsEstablished () && old->GetEndpointIdentHash () == it->GetEndpointIdentHash ()) |
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{ |
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tunnel = it; |
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break; |
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} |
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} |
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if (!tunnel) |
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tunnel = GetNextOutboundTunnel (); |
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return tunnel; |
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} |
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void TunnelPool::CreateTunnels () |
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{ |
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int num = 0; |
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{ |
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
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for (const auto& it : m_OutboundTunnels) |
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if (it->IsEstablished ()) num++; |
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} |
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for (int i = num; i < m_NumOutboundTunnels; i++) |
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CreateOutboundTunnel (); |
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num = 0; |
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{ |
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
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for (const auto& it : m_InboundTunnels) |
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if (it->IsEstablished ()) num++; |
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} |
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if (!num && !m_OutboundTunnels.empty () && m_NumOutboundHops > 0) |
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{ |
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for (auto it: m_OutboundTunnels) |
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{ |
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CreatePairedInboundTunnel (it); |
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num++; |
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if (num >= m_NumInboundTunnels) break; |
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} |
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} |
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for (int i = num; i < m_NumInboundTunnels; i++) |
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CreateInboundTunnel (); |
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if (num < m_NumInboundTunnels && m_NumInboundHops <= 0 && m_LocalDestination) // zero hops IB |
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m_LocalDestination->SetLeaseSetUpdated (); // update LeaseSet immediately |
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} |
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void TunnelPool::TestTunnels () |
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{ |
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decltype(m_Tests) tests; |
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{ |
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std::unique_lock<std::mutex> l(m_TestsMutex); |
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tests.swap(m_Tests); |
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} |
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for (auto& it: tests) |
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{ |
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LogPrint (eLogWarning, "Tunnels: test of tunnel ", it.first, " failed"); |
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// if test failed again with another tunnel we consider it failed |
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if (it.second.first) |
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{ |
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if (it.second.first->GetState () == eTunnelStateTestFailed) |
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{ |
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it.second.first->SetState (eTunnelStateFailed); |
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std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex); |
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m_OutboundTunnels.erase (it.second.first); |
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} |
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else |
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it.second.first->SetState (eTunnelStateTestFailed); |
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} |
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if (it.second.second) |
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{ |
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if (it.second.second->GetState () == eTunnelStateTestFailed) |
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{ |
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it.second.second->SetState (eTunnelStateFailed); |
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{ |
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std::unique_lock<std::mutex> l(m_InboundTunnelsMutex); |
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m_InboundTunnels.erase (it.second.second); |
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} |
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if (m_LocalDestination) |
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m_LocalDestination->SetLeaseSetUpdated (); |
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} |
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else |
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it.second.second->SetState (eTunnelStateTestFailed); |
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} |
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} |
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// new tests |
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auto it1 = m_OutboundTunnels.begin (); |
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auto it2 = m_InboundTunnels.begin (); |
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while (it1 != m_OutboundTunnels.end () && it2 != m_InboundTunnels.end ()) |
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{ |
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bool failed = false; |
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if ((*it1)->IsFailed ()) |
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{ |
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failed = true; |
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++it1; |
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} |
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if ((*it2)->IsFailed ()) |
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{ |
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failed = true; |
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++it2; |
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} |
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if (!failed) |
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{ |
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uint32_t msgID; |
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RAND_bytes ((uint8_t *)&msgID, 4); |
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{ |
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std::unique_lock<std::mutex> l(m_TestsMutex); |
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m_Tests[msgID] = std::make_pair (*it1, *it2); |
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} |
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(*it1)->SendTunnelDataMsg ((*it2)->GetNextIdentHash (), (*it2)->GetNextTunnelID (), |
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CreateDeliveryStatusMsg (msgID)); |
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++it1; ++it2; |
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} |
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} |
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} |
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void TunnelPool::ManageTunnels (uint64_t ts) |
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{ |
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if (ts > m_NextManageTime) |
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{ |
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CreateTunnels (); |
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TestTunnels (); |
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m_NextManageTime = ts + TUNNEL_POOL_MANAGE_INTERVAL + (rand () % TUNNEL_POOL_MANAGE_INTERVAL)/2; |
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} |
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} |
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void TunnelPool::ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg) |
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{ |
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if (m_LocalDestination) |
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m_LocalDestination->ProcessGarlicMessage (msg); |
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else |
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LogPrint (eLogWarning, "Tunnels: local destination doesn't exist, dropped"); |
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} |
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void TunnelPool::ProcessDeliveryStatus (std::shared_ptr<I2NPMessage> msg) |
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{ |
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const uint8_t * buf = msg->GetPayload (); |
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uint32_t msgID = bufbe32toh (buf); |
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buf += 4; |
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uint64_t timestamp = bufbe64toh (buf); |
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decltype(m_Tests)::mapped_type test; |
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bool found = false; |
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{ |
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std::unique_lock<std::mutex> l(m_TestsMutex); |
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auto it = m_Tests.find (msgID); |
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if (it != m_Tests.end ()) |
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{ |
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found = true; |
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test = it->second; |
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m_Tests.erase (it); |
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} |
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} |
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if (found) |
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{ |
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uint64_t dlt = i2p::util::GetMillisecondsSinceEpoch () - timestamp; |
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LogPrint (eLogDebug, "Tunnels: test of ", msgID, " successful. ", dlt, " milliseconds"); |
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uint64_t latency = dlt / 2; |
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// restore from test failed state if any |
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if (test.first) |
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{ |
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if (test.first->GetState () == eTunnelStateTestFailed) |
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test.first->SetState (eTunnelStateEstablished); |
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// update latency |
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test.first->AddLatencySample(latency); |
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} |
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if (test.second) |
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{ |
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if (test.second->GetState () == eTunnelStateTestFailed) |
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test.second->SetState (eTunnelStateEstablished); |
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// update latency |
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test.second->AddLatencySample(latency); |
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} |
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} |
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else |
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{ |
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if (m_LocalDestination) |
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m_LocalDestination->ProcessDeliveryStatusMessage (msg); |
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else |
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LogPrint (eLogWarning, "Tunnels: Local destination doesn't exist, dropped"); |
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} |
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} |
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std::shared_ptr<const i2p::data::RouterInfo> TunnelPool::SelectNextHop (std::shared_ptr<const i2p::data::RouterInfo> prevHop, bool reverse) const |
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{ |
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bool isExploratory = (i2p::tunnel::tunnels.GetExploratoryPool () == shared_from_this ()); |
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auto hop = isExploratory ? i2p::data::netdb.GetRandomRouter (prevHop, reverse): |
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i2p::data::netdb.GetHighBandwidthRandomRouter (prevHop, reverse); |
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if (!hop || hop->GetProfile ()->IsBad ()) |
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hop = i2p::data::netdb.GetRandomRouter (prevHop, reverse); |
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return hop; |
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} |
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bool StandardSelectPeers(Path & peers, int numHops, bool inbound, SelectHopFunc nextHop) |
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{ |
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auto prevHop = i2p::context.GetSharedRouterInfo (); |
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if(i2p::transport::transports.RoutesRestricted()) |
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{ |
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/** if routes are restricted prepend trusted first hop */ |
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auto hop = i2p::transport::transports.GetRestrictedPeer(); |
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if(!hop) return false; |
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peers.push_back(hop->GetRouterIdentity()); |
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prevHop = hop; |
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} |
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else if (i2p::transport::transports.GetNumPeers () > 25) |
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{ |
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auto r = i2p::transport::transports.GetRandomPeer (); |
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if (r && !r->GetProfile ()->IsBad () && |
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(numHops > 1 || (!inbound && r->IsV4 ()) || r->IsReachable ())) // first inbound must be reachable |
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{ |
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prevHop = r; |
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peers.push_back (r->GetRouterIdentity ()); |
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numHops--; |
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} |
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} |
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for(int i = 0; i < numHops; i++ ) |
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{ |
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auto hop = nextHop (prevHop, inbound); |
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if (!hop && !i) // if no suitable peer found for first hop, try already connected |
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{ |
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LogPrint (eLogInfo, "Tunnels: Can't select first hop for a tunnel. Trying already connected"); |
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hop = i2p::transport::transports.GetRandomPeer (); |
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} |
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if (!hop) |
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{ |
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LogPrint (eLogError, "Tunnels: Can't select next hop for ", prevHop->GetIdentHashBase64 ()); |
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return false; |
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} |
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if ((i == numHops - 1) && |
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((inbound && !hop->IsReachable ()) || // IBGW is not reachable |
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(!inbound && !hop->IsV4 ()))) // OBEP is not ipv4 |
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{ |
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auto hop1 = nextHop (prevHop, true); |
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if (hop1) hop = hop1; |
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} |
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prevHop = hop; |
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peers.push_back (hop->GetRouterIdentity ()); |
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} |
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return true; |
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} |
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bool TunnelPool::SelectPeers (std::vector<std::shared_ptr<const i2p::data::IdentityEx> >& peers, bool isInbound) |
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{ |
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int numHops = isInbound ? m_NumInboundHops : m_NumOutboundHops; |
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// peers is empty |
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if (numHops <= 0) return true; |
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// custom peer selector in use ? |
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{ |
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std::lock_guard<std::mutex> lock(m_CustomPeerSelectorMutex); |
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if (m_CustomPeerSelector) |
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return m_CustomPeerSelector->SelectPeers(peers, numHops, isInbound); |
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} |
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// explicit peers in use |
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if (m_ExplicitPeers) return SelectExplicitPeers (peers, isInbound); |
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return StandardSelectPeers(peers, numHops, isInbound, std::bind(&TunnelPool::SelectNextHop, this, std::placeholders::_1, std::placeholders::_2)); |
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} |
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bool TunnelPool::SelectExplicitPeers (std::vector<std::shared_ptr<const i2p::data::IdentityEx> >& peers, bool isInbound) |
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{ |
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int size = m_ExplicitPeers->size (); |
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std::vector<int> peerIndicies; |
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for (int i = 0; i < size; i++) peerIndicies.push_back(i); |
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std::shuffle (peerIndicies.begin(), peerIndicies.end(), std::mt19937(std::random_device()())); |
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int numHops = isInbound ? m_NumInboundHops : m_NumOutboundHops; |
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for (int i = 0; i < numHops; i++) |
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{ |
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auto& ident = (*m_ExplicitPeers)[peerIndicies[i]]; |
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auto r = i2p::data::netdb.FindRouter (ident); |
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if (r) |
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peers.push_back (r->GetRouterIdentity ()); |
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else |
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{ |
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LogPrint (eLogInfo, "Tunnels: Can't find router for ", ident.ToBase64 ()); |
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i2p::data::netdb.RequestDestination (ident); |
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return false; |
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} |
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} |
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return true; |
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} |
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void TunnelPool::CreateInboundTunnel () |
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{ |
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auto outboundTunnel = GetNextOutboundTunnel (); |
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if (!outboundTunnel) |
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outboundTunnel = tunnels.GetNextOutboundTunnel (); |
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LogPrint (eLogDebug, "Tunnels: Creating destination inbound tunnel..."); |
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std::vector<std::shared_ptr<const i2p::data::IdentityEx> > peers; |
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if (SelectPeers (peers, true)) |
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{ |
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std::shared_ptr<TunnelConfig> config; |
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if (m_NumInboundHops > 0) |
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{ |
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std::reverse (peers.begin (), peers.end ()); |
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config = std::make_shared<TunnelConfig> (peers); |
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} |
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auto tunnel = tunnels.CreateInboundTunnel (config, outboundTunnel); |
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tunnel->SetTunnelPool (shared_from_this ()); |
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if (tunnel->IsEstablished ()) // zero hops |
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TunnelCreated (tunnel); |
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} |
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else |
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LogPrint (eLogError, "Tunnels: Can't create inbound tunnel, no peers available"); |
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} |
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void TunnelPool::RecreateInboundTunnel (std::shared_ptr<InboundTunnel> tunnel) |
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{ |
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auto outboundTunnel = GetNextOutboundTunnel (); |
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if (!outboundTunnel) |
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outboundTunnel = tunnels.GetNextOutboundTunnel (); |
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LogPrint (eLogDebug, "Tunnels: Re-creating destination inbound tunnel..."); |
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std::shared_ptr<TunnelConfig> config; |
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if (m_NumInboundHops > 0 && tunnel->GetPeers().size()) |
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{ |
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config = std::make_shared<TunnelConfig>(tunnel->GetPeers ()); |
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} |
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if (m_NumInboundHops == 0 || config) |
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{ |
|
auto newTunnel = tunnels.CreateInboundTunnel (config, outboundTunnel); |
|
newTunnel->SetTunnelPool (shared_from_this()); |
|
if (newTunnel->IsEstablished ()) // zero hops |
|
TunnelCreated (newTunnel); |
|
} |
|
} |
|
|
|
void TunnelPool::CreateOutboundTunnel () |
|
{ |
|
auto inboundTunnel = GetNextInboundTunnel (); |
|
if (!inboundTunnel) |
|
inboundTunnel = tunnels.GetNextInboundTunnel (); |
|
if (inboundTunnel) |
|
{ |
|
LogPrint (eLogDebug, "Tunnels: Creating destination outbound tunnel..."); |
|
std::vector<std::shared_ptr<const i2p::data::IdentityEx> > peers; |
|
if (SelectPeers (peers, false)) |
|
{ |
|
std::shared_ptr<TunnelConfig> config; |
|
if (m_NumOutboundHops > 0) |
|
config = std::make_shared<TunnelConfig>(peers, inboundTunnel->GetNextTunnelID (), inboundTunnel->GetNextIdentHash ()); |
|
auto tunnel = tunnels.CreateOutboundTunnel (config); |
|
tunnel->SetTunnelPool (shared_from_this ()); |
|
if (tunnel->IsEstablished ()) // zero hops |
|
TunnelCreated (tunnel); |
|
} |
|
else |
|
LogPrint (eLogError, "Tunnels: Can't create outbound tunnel, no peers available"); |
|
} |
|
else |
|
LogPrint (eLogError, "Tunnels: Can't create outbound tunnel, no inbound tunnels found"); |
|
} |
|
|
|
void TunnelPool::RecreateOutboundTunnel (std::shared_ptr<OutboundTunnel> tunnel) |
|
{ |
|
auto inboundTunnel = GetNextInboundTunnel (); |
|
if (!inboundTunnel) |
|
inboundTunnel = tunnels.GetNextInboundTunnel (); |
|
if (inboundTunnel) |
|
{ |
|
LogPrint (eLogDebug, "Tunnels: Re-creating destination outbound tunnel..."); |
|
std::shared_ptr<TunnelConfig> config; |
|
if (m_NumOutboundHops > 0 && tunnel->GetPeers().size()) |
|
{ |
|
config = std::make_shared<TunnelConfig>(tunnel->GetPeers (), inboundTunnel->GetNextTunnelID (), inboundTunnel->GetNextIdentHash ()); |
|
} |
|
if (!m_NumOutboundHops || config) |
|
{ |
|
auto newTunnel = tunnels.CreateOutboundTunnel (config); |
|
newTunnel->SetTunnelPool (shared_from_this ()); |
|
if (newTunnel->IsEstablished ()) // zero hops |
|
TunnelCreated (newTunnel); |
|
} |
|
} |
|
else |
|
LogPrint (eLogDebug, "Tunnels: Can't re-create outbound tunnel, no inbound tunnels found"); |
|
} |
|
|
|
void TunnelPool::CreatePairedInboundTunnel (std::shared_ptr<OutboundTunnel> outboundTunnel) |
|
{ |
|
LogPrint (eLogDebug, "Tunnels: Creating paired inbound tunnel..."); |
|
auto tunnel = tunnels.CreateInboundTunnel ( |
|
m_NumOutboundHops > 0 ? std::make_shared<TunnelConfig>(outboundTunnel->GetInvertedPeers ()) : nullptr, |
|
outboundTunnel); |
|
tunnel->SetTunnelPool (shared_from_this ()); |
|
if (tunnel->IsEstablished ()) // zero hops |
|
TunnelCreated (tunnel); |
|
} |
|
|
|
void TunnelPool::SetCustomPeerSelector(ITunnelPeerSelector * selector) |
|
{ |
|
std::lock_guard<std::mutex> lock(m_CustomPeerSelectorMutex); |
|
m_CustomPeerSelector = selector; |
|
} |
|
|
|
void TunnelPool::UnsetCustomPeerSelector() |
|
{ |
|
SetCustomPeerSelector(nullptr); |
|
} |
|
|
|
bool TunnelPool::HasCustomPeerSelector() |
|
{ |
|
std::lock_guard<std::mutex> lock(m_CustomPeerSelectorMutex); |
|
return m_CustomPeerSelector != nullptr; |
|
} |
|
|
|
std::shared_ptr<InboundTunnel> TunnelPool::GetLowestLatencyInboundTunnel(std::shared_ptr<InboundTunnel> exclude) const |
|
{ |
|
std::shared_ptr<InboundTunnel> tun = nullptr; |
|
std::unique_lock<std::mutex> lock(m_InboundTunnelsMutex); |
|
uint64_t min = 1000000; |
|
for (const auto & itr : m_InboundTunnels) { |
|
if(!itr->LatencyIsKnown()) continue; |
|
auto l = itr->GetMeanLatency(); |
|
if (l >= min) continue; |
|
tun = itr; |
|
if(tun == exclude) continue; |
|
min = l; |
|
} |
|
return tun; |
|
} |
|
|
|
std::shared_ptr<OutboundTunnel> TunnelPool::GetLowestLatencyOutboundTunnel(std::shared_ptr<OutboundTunnel> exclude) const |
|
{ |
|
std::shared_ptr<OutboundTunnel> tun = nullptr; |
|
std::unique_lock<std::mutex> lock(m_OutboundTunnelsMutex); |
|
uint64_t min = 1000000; |
|
for (const auto & itr : m_OutboundTunnels) { |
|
if(!itr->LatencyIsKnown()) continue; |
|
auto l = itr->GetMeanLatency(); |
|
if (l >= min) continue; |
|
tun = itr; |
|
if(tun == exclude) continue; |
|
min = l; |
|
} |
|
return tun; |
|
} |
|
} |
|
}
|
|
|