handle transit tunnel build messages in separate thread

libi2pd/TransitTunnel.cpp

@@ -122,15 +122,87 @@ namespace tunnel
 		}
 	}
 
+	TransitTunnels::TransitTunnels ():
+		m_IsRunning (false)
+	{
+	}
+		
+	TransitTunnels::~TransitTunnels ()
+	{
+		Stop ();
+	}	
+		
 	void TransitTunnels::Start () 
 	{
+		m_IsRunning = true;
+		m_Thread.reset (new std::thread (std::bind (&TransitTunnels::Run, this)));
 	}
 		
 	void TransitTunnels::Stop ()
 	{
+		m_IsRunning = false;
+		m_TunnelBuildMsgQueue.WakeUp ();
+		if (m_Thread)
+		{
+			m_Thread->join ();
+			m_Thread = nullptr;
+		}
 		m_TransitTunnels.clear ();
 	}	
 
+	void TransitTunnels::Run () 
+	{
+		i2p::util::SetThreadName("TBM");
+		uint64_t lastTs = 0;
+		std::list<std::shared_ptr<I2NPMessage> > msgs;
+		while (m_IsRunning)
+		{
+			try
+			{
+				if (m_TunnelBuildMsgQueue.Wait (TRANSIT_TUNNELS_QUEUE_WAIT_INTERVAL, 0))
+				{
+					m_TunnelBuildMsgQueue.GetWholeQueue (msgs);
+					while (!msgs.empty ())
+					{
+						auto msg = msgs.front (); msgs.pop_front ();
+						if (!msg) continue;
+						uint8_t typeID = msg->GetTypeID ();
+						switch (typeID)
+						{
+							case eI2NPShortTunnelBuild:
+								HandleShortTransitTunnelBuildMsg (std::move (msg));
+							break;	
+							case eI2NPVariableTunnelBuild:
+								HandleVariableTransitTunnelBuildMsg (std::move (msg));
+							break;	
+							default:
+								LogPrint (eLogWarning, "TransitTunnel: Unexpected message type ", (int) typeID);
+						}
+						if (!m_IsRunning) break;
+					}	
+				}	
+				if (m_IsRunning)
+				{
+					uint64_t ts = i2p::util::GetSecondsSinceEpoch ();
+					if (ts  >= lastTs + TUNNEL_MANAGE_INTERVAL || ts + TUNNEL_MANAGE_INTERVAL < lastTs)
+					{
+						ManageTransitTunnels (ts);
+						lastTs = ts;
+					}
+				}	
+			}
+			catch (std::exception& ex)
+			{
+				LogPrint (eLogError, "TransitTunnel: Runtime exception: ", ex.what ());
+			}
+		}
+	}
+
+	void TransitTunnels::PostTransitTunnelBuildMsg  (std::shared_ptr<I2NPMessage>&& msg)
+	{
+		if (msg) m_TunnelBuildMsgQueue.Put (msg);
+	}	
+		
 	void TransitTunnels::HandleShortTransitTunnelBuildMsg (std::shared_ptr<I2NPMessage>&& msg)
 	{
 		if (!msg) return;
@@ -234,6 +306,7 @@ namespace tunnel
 					{
 						if (transitTunnel)
 						{
+							LogPrint (eLogDebug, "TransitTunnel: Failed to send reply for transit tunnel ", transitTunnel->GetTunnelID ());
 							auto t = transitTunnel->GetCreationTime ();
 							if (t > i2p::tunnel::TUNNEL_EXPIRATION_TIMEOUT)
 								// make transit tunnel expired 

libi2pd/TransitTunnel.h

@@ -14,6 +14,7 @@
 #include <mutex>
 #include <memory>
 #include "Crypto.h"
+#include "Queue.h"
 #include "I2NPProtocol.h"
 #include "TunnelEndpoint.h"
 #include "TunnelGateway.h"
@@ -109,33 +110,45 @@ namespace tunnel
 		const i2p::crypto::AESKey& layerKey, const i2p::crypto::AESKey& ivKey,
 		bool isGateway, bool isEndpoint);
 
+	
+	const int TRANSIT_TUNNELS_QUEUE_WAIT_INTERVAL = 10; // in seconds
+		
 	class TransitTunnels
 	{	
 		public:
 
+			TransitTunnels ();
+			~TransitTunnels ();
+			
 			void Start ();
 			void Stop ();
-			void ManageTransitTunnels (uint64_t ts);
+			void PostTransitTunnelBuildMsg  (std::shared_ptr<I2NPMessage>&& msg);
 			
 			size_t GetNumTransitTunnels () const { return m_TransitTunnels.size (); }
 			int GetTransitTunnelsExpirationTimeout ();
 
-			void HandleShortTransitTunnelBuildMsg (std::shared_ptr<I2NPMessage>&& msg);
-			void HandleVariableTransitTunnelBuildMsg (std::shared_ptr<I2NPMessage>&& msg);
-
 		private:
 
 			bool AddTransitTunnel (std::shared_ptr<TransitTunnel> tunnel);
+			void ManageTransitTunnels (uint64_t ts);
+
+			void HandleShortTransitTunnelBuildMsg (std::shared_ptr<I2NPMessage>&& msg);
+			void HandleVariableTransitTunnelBuildMsg (std::shared_ptr<I2NPMessage>&& msg);
 			bool HandleBuildRequestRecords (int num, uint8_t * records, uint8_t * clearText);
 
+			void Run ();
+			
 		private:
 
+			volatile bool m_IsRunning;
+			std::unique_ptr<std::thread> m_Thread;
 			std::list<std::shared_ptr<TransitTunnel> > m_TransitTunnels;
+			i2p::util::Queue<std::shared_ptr<I2NPMessage> > m_TunnelBuildMsgQueue;
 			
 		public:
 
 			// for HTTP only
-			auto& GetTransitTunnels () const { return m_TransitTunnels; };
+			const auto& GetTransitTunnels () const { return m_TransitTunnels; };
 	};
 }
 }

libi2pd/Tunnel.cpp

@@ -373,6 +373,7 @@ namespace tunnel
 
 	std::shared_ptr<TunnelBase> Tunnels::GetTunnel (uint32_t tunnelID)
 	{
+		std::lock_guard<std::mutex> l(m_TunnelsMutex);
 		auto it = m_Tunnels.find(tunnelID);
 		if (it != m_Tunnels.end ())
 			return it->second;
@@ -382,11 +383,13 @@ namespace tunnel
 	bool Tunnels::AddTunnel (std::shared_ptr<TunnelBase> tunnel)
 	{
 		if (!tunnel) return false;
+		std::lock_guard<std::mutex> l(m_TunnelsMutex);
 		return m_Tunnels.emplace (tunnel->GetTunnelID (), tunnel).second;
 	}
 		
 	void Tunnels::RemoveTunnel (uint32_t tunnelID)
 	{
+		std::lock_guard<std::mutex> l(m_TunnelsMutex);
 		m_Tunnels.erase (tunnelID);
 	}	
 		
@@ -655,7 +658,7 @@ namespace tunnel
 			return;
 		}
 		else
-			m_TransitTunnels.HandleShortTransitTunnelBuildMsg (std::move (msg));
+			m_TransitTunnels.PostTransitTunnelBuildMsg (std::move (msg));
 	}	
 
 	void Tunnels::HandleVariableTunnelBuildMsg (std::shared_ptr<I2NPMessage> msg)
@@ -678,7 +681,7 @@ namespace tunnel
 			}
 		}
 		else
-			m_TransitTunnels.HandleVariableTransitTunnelBuildMsg (std::move (msg));
+			m_TransitTunnels.PostTransitTunnelBuildMsg (std::move (msg));
 	}	
 
 	void Tunnels::HandleTunnelBuildReplyMsg (std::shared_ptr<I2NPMessage> msg, bool isShort)
@@ -710,7 +713,6 @@ namespace tunnel
 		ManagePendingTunnels (ts);
 		ManageInboundTunnels (ts);
 		ManageOutboundTunnels (ts);
-		m_TransitTunnels.ManageTransitTunnels (ts);
 	}
 
 	void Tunnels::ManagePendingTunnels (uint64_t ts)

libi2pd/Tunnel.h

@@ -300,8 +300,9 @@ namespace tunnel
 			std::map<uint32_t, std::shared_ptr<OutboundTunnel> > m_PendingOutboundTunnels; // by replyMsgID
 			std::list<std::shared_ptr<InboundTunnel> > m_InboundTunnels;
 			std::list<std::shared_ptr<OutboundTunnel> > m_OutboundTunnels;
+			mutable std::mutex m_TunnelsMutex;
 			std::unordered_map<uint32_t, std::shared_ptr<TunnelBase> > m_Tunnels; // tunnelID->tunnel known by this id
-			std::mutex m_PoolsMutex;
+			mutable std::mutex m_PoolsMutex;
 			std::list<std::shared_ptr<TunnelPool>> m_Pools;
 			std::shared_ptr<TunnelPool> m_ExploratoryPool;
 			i2p::util::Queue<std::shared_ptr<I2NPMessage> > m_Queue;
@@ -320,7 +321,7 @@ namespace tunnel
 			// for HTTP only
 			const decltype(m_OutboundTunnels)& GetOutboundTunnels () const { return m_OutboundTunnels; };
 			const decltype(m_InboundTunnels)& GetInboundTunnels () const { return m_InboundTunnels; };
-			auto& GetTransitTunnels () const { return m_TransitTunnels.GetTransitTunnels (); };
+			const auto& GetTransitTunnels () const { return m_TransitTunnels.GetTransitTunnels (); };
 
 			size_t CountTransitTunnels() const;
 			size_t CountInboundTunnels() const;