mirror of
https://github.com/PurpleI2P/i2pd
synced 2024-11-10 08:00:38 +03:00
672 lines
20 KiB
C++
672 lines
20 KiB
C++
/*
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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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bool skipped = false;
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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 (it->IsSlow () || (HasLatencyRequirement() && it->LatencyIsKnown() &&
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!it->LatencyFitsRange(m_MinLatency, m_MaxLatency)))
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{
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i++; skipped = true;
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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 (!tunnel && skipped)
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{
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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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bool TunnelPool::IsExploratory () const
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{
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return i2p::tunnel::tunnels.GetExploratoryPool () == shared_from_this ();
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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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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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int start = 0;
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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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start++;
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}
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else if (i2p::transport::transports.GetNumPeers () > 100 ||
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(inbound && 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 || (r->IsV4 () && (!inbound || 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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start++;
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}
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}
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for(int i = start; 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) && (!hop->IsV4 () || // doesn't support ipv4
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(inbound && !hop->IsReachable ()))) // IBGW is not reachable
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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 ();
|
|
std::vector<int> peerIndicies;
|
|
for (int i = 0; i < size; i++) peerIndicies.push_back(i);
|
|
std::shuffle (peerIndicies.begin(), peerIndicies.end(), std::mt19937(std::random_device()()));
|
|
|
|
int numHops = isInbound ? m_NumInboundHops : m_NumOutboundHops;
|
|
for (int i = 0; i < numHops; i++)
|
|
{
|
|
auto& ident = (*m_ExplicitPeers)[peerIndicies[i]];
|
|
auto r = i2p::data::netdb.FindRouter (ident);
|
|
if (r)
|
|
peers.push_back (r->GetRouterIdentity ());
|
|
else
|
|
{
|
|
LogPrint (eLogInfo, "Tunnels: Can't find router for ", ident.ToBase64 ());
|
|
i2p::data::netdb.RequestDestination (ident);
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void TunnelPool::CreateInboundTunnel ()
|
|
{
|
|
auto outboundTunnel = GetNextOutboundTunnel ();
|
|
if (!outboundTunnel)
|
|
outboundTunnel = tunnels.GetNextOutboundTunnel ();
|
|
LogPrint (eLogDebug, "Tunnels: Creating destination inbound tunnel...");
|
|
std::vector<std::shared_ptr<const i2p::data::IdentityEx> > peers;
|
|
if (SelectPeers (peers, true))
|
|
{
|
|
std::shared_ptr<TunnelConfig> config;
|
|
if (m_NumInboundHops > 0)
|
|
{
|
|
std::reverse (peers.begin (), peers.end ());
|
|
config = std::make_shared<TunnelConfig> (peers);
|
|
}
|
|
auto tunnel = tunnels.CreateInboundTunnel (config, outboundTunnel);
|
|
tunnel->SetTunnelPool (shared_from_this ());
|
|
if (tunnel->IsEstablished ()) // zero hops
|
|
TunnelCreated (tunnel);
|
|
}
|
|
else
|
|
LogPrint (eLogError, "Tunnels: Can't create inbound tunnel, no peers available");
|
|
}
|
|
|
|
void TunnelPool::RecreateInboundTunnel (std::shared_ptr<InboundTunnel> tunnel)
|
|
{
|
|
if (IsExploratory () || tunnel->IsSlow ()) // always create new exploratory tunnel or if slow
|
|
{
|
|
CreateInboundTunnel ();
|
|
return;
|
|
}
|
|
auto outboundTunnel = GetNextOutboundTunnel ();
|
|
if (!outboundTunnel)
|
|
outboundTunnel = tunnels.GetNextOutboundTunnel ();
|
|
LogPrint (eLogDebug, "Tunnels: Re-creating destination inbound tunnel...");
|
|
std::shared_ptr<TunnelConfig> config;
|
|
if (m_NumInboundHops > 0 && tunnel->GetPeers().size())
|
|
{
|
|
config = std::make_shared<TunnelConfig>(tunnel->GetPeers ());
|
|
}
|
|
if (m_NumInboundHops == 0 || config)
|
|
{
|
|
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)
|
|
{
|
|
if (IsExploratory () || tunnel->IsSlow ()) // always create new exploratory tunnel or if slow
|
|
{
|
|
CreateOutboundTunnel ();
|
|
return;
|
|
}
|
|
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;
|
|
}
|
|
}
|
|
}
|