send tunnel participant data to transport session directly. Implemented TunnelTransportSender

libi2pd/NetDb.cpp

@@ -502,7 +502,7 @@ namespace data
 		}
 
 		// send them off
-		i2p::transport::transports.SendMessages(ih, requests);
+		i2p::transport::transports.SendMessages(ih, std::move (requests));
 	}
 
 	bool NetDb::LoadRouterInfo (const std::string& path, uint64_t ts)

libi2pd/TransitTunnel.cpp

@@ -62,7 +62,8 @@ namespace tunnel
 			auto num = m_TunnelDataMsgs.size ();
 			if (num > 1)
 				LogPrint (eLogDebug, "TransitTunnel: ", GetTunnelID (), "->", GetNextTunnelID (), " ", num);
-			i2p::transport::transports.SendMessages (GetNextIdentHash (), m_TunnelDataMsgs); // send and clear
+			if (!m_Sender) m_Sender = std::make_unique<TunnelTransportSender>();
+			m_Sender->SendMessagesTo (GetNextIdentHash (), m_TunnelDataMsgs); // send and clear
 		}
 	}
 

libi2pd/TransitTunnel.h

@@ -63,6 +63,7 @@ namespace tunnel
 
 			size_t m_NumTransmittedBytes;
 			std::list<std::shared_ptr<i2p::I2NPMessage> > m_TunnelDataMsgs;
+			std::unique_ptr<TunnelTransportSender> m_Sender;
 	};
 
 	class TransitTunnelGateway: public TransitTunnel

libi2pd/Transports.cpp

@@ -454,13 +454,6 @@ namespace transport
 		return {}; // invalid future
 	}
 
-	std::future<std::shared_ptr<TransportSession> > Transports::SendMessages (const i2p::data::IdentHash& ident, std::list<std::shared_ptr<i2p::I2NPMessage> >& msgs)
-	{
-		std::list<std::shared_ptr<i2p::I2NPMessage> > msgs1;
-		msgs.swap (msgs1);
-		return SendMessages (ident, std::move (msgs1));
-	}
-
 	std::future<std::shared_ptr<TransportSession> > Transports::SendMessages (const i2p::data::IdentHash& ident, std::list<std::shared_ptr<i2p::I2NPMessage> >&& msgs)
 	{
 		return boost::asio::post (*m_Service, boost::asio::use_future ([this, ident, msgs = std::move(msgs)] () mutable

libi2pd/Transports.h

@@ -145,7 +145,6 @@ namespace transport
 			void ReuseX25519KeysPair (std::shared_ptr<i2p::crypto::X25519Keys> pair);
 
 			std::future<std::shared_ptr<TransportSession> > SendMessage (const i2p::data::IdentHash& ident, std::shared_ptr<i2p::I2NPMessage> msg);
-			std::future<std::shared_ptr<TransportSession> > SendMessages (const i2p::data::IdentHash& ident, std::list<std::shared_ptr<i2p::I2NPMessage> >& msgs);
 			std::future<std::shared_ptr<TransportSession> > SendMessages (const i2p::data::IdentHash& ident, std::list<std::shared_ptr<i2p::I2NPMessage> >&& msgs);
 
 			void PeerConnected (std::shared_ptr<TransportSession> session);

libi2pd/TunnelBase.cpp

@@ -0,0 +1,64 @@
+/*
+* Copyright (c) 2024, The PurpleI2P Project
+*
+* This file is part of Purple i2pd project and licensed under BSD3
+*
+* See full license text in LICENSE file at top of project tree
+*
+*/
+
+#include "Transports.h"
+#include "TunnelBase.h"
+
+namespace i2p
+{
+namespace tunnel
+{
+	void TunnelTransportSender::SendMessagesTo (const i2p::data::IdentHash& to,
+		std::list<std::shared_ptr<I2NPMessage> >&& msgs)
+	{
+		if (msgs.empty ()) return;
+		auto currentTransport = m_CurrentTransport.lock ();
+		if (!currentTransport)
+		{
+			// try to obtain transport from pending request or send thought transport is not complete
+			if (m_PendingTransport.valid ()) // pending request?
+			{
+				if (m_PendingTransport.wait_for(std::chrono::seconds(0)) == std::future_status::ready) 
+				{	
+					// pending request complete
+					currentTransport = m_PendingTransport.get (); // take transports used in pending request
+					if (currentTransport)
+					{	
+						if (currentTransport->IsEstablished ()) 
+							m_CurrentTransport = currentTransport;
+						else
+							currentTransport = nullptr;
+					}
+				}	
+				else // still pending
+				{	
+					// send through transports, but don't update pending transport
+					i2p::transport::transports.SendMessages (to, std::move (msgs));
+					return;
+				}	
+			}
+		}
+		if (currentTransport) // session is good
+			// send to session directly
+			currentTransport->SendI2NPMessages (msgs);
+		else // no session yet
+			// send through transports
+			m_PendingTransport = i2p::transport::transports.SendMessages (to, std::move (msgs));
+
+	}
+
+	void TunnelTransportSender::SendMessagesTo (const i2p::data::IdentHash& to,
+		std::list<std::shared_ptr<I2NPMessage> >& msgs)
+	{
+		std::list<std::shared_ptr<i2p::I2NPMessage> > msgs1;
+		msgs.swap (msgs1);
+		SendMessagesTo (to, std::move (msgs1));
+	}	
+}
+}

libi2pd/TunnelBase.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2022, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -11,12 +11,19 @@
 
 #include <inttypes.h>
 #include <memory>
+#include <future>
+#include <list>
 #include "Timestamp.h"
 #include "I2NPProtocol.h"
 #include "Identity.h"
 
 namespace i2p
 {
+namespace transport
+{
+	class TransportSession;
+}	
+	
 namespace tunnel
 {
 	const size_t TUNNEL_DATA_MSG_SIZE = 1028;
@@ -76,6 +83,22 @@ namespace tunnel
 				return t1 < t2;
 		}
 	};
+
+	class TunnelTransportSender final
+	{
+		public: 
+
+			TunnelTransportSender () = default;
+			~TunnelTransportSender () = default;
+
+			void SendMessagesTo (const i2p::data::IdentHash& to, std::list<std::shared_ptr<I2NPMessage> >&& msgs);
+			void SendMessagesTo (const i2p::data::IdentHash& to, std::list<std::shared_ptr<I2NPMessage> >& msgs); // send and clear
+			
+		private:
+			
+			std::weak_ptr<i2p::transport::TransportSession> m_CurrentTransport;
+			std::future<std::shared_ptr<i2p::transport::TransportSession> > m_PendingTransport;
+	};	
 }
 }
 

libi2pd/TunnelGateway.cpp

@@ -235,40 +235,9 @@ namespace tunnel
 			m_NumSentBytes += TUNNEL_DATA_MSG_SIZE;
 		}
 		m_Buffer.ClearTunnelDataMsgs ();
-
 		// send 
-		auto currentTransport = m_CurrentTransport.lock ();
-		if (!currentTransport)
-		{
-			// try to obtain transport from pending request or send thought transport is not complete
-			if (m_PendingTransport.valid ()) // pending request?
-			{
-				if (m_PendingTransport.wait_for(std::chrono::seconds(0)) == std::future_status::ready) 
-				{	
-					// pending request complete
-					currentTransport = m_PendingTransport.get (); // take transports used in pending request
-					if (currentTransport)
-					{	
-						if (currentTransport->IsEstablished ()) 
-							m_CurrentTransport = currentTransport;
-						else
-							currentTransport = nullptr;
-					}
-				}	
-				else // still pending
-				{	
-					// send through transports, but don't update pending transport
-					i2p::transport::transports.SendMessages (m_Tunnel.GetNextIdentHash (), std::move (newTunnelMsgs));
-					return;
-				}	
-			}
-		}
-		if (currentTransport) // session is good
-			// send to session directly
-			currentTransport->SendI2NPMessages (newTunnelMsgs);
-		else // no session yet
-			// send through transports
-			m_PendingTransport = i2p::transport::transports.SendMessages (m_Tunnel.GetNextIdentHash (), std::move (newTunnelMsgs));
+		if (!m_Sender) m_Sender = std::make_unique<TunnelTransportSender>();
+		m_Sender->SendMessagesTo (m_Tunnel.GetNextIdentHash (), std::move (newTunnelMsgs));		
 	}
 }
 }

libi2pd/TunnelGateway.h

@@ -12,9 +12,7 @@
 #include <inttypes.h>
 #include <vector>
 #include <memory>
-#include <future>
 #include "I2NPProtocol.h"
-#include "TransportSession.h"
 #include "TunnelBase.h"
 
 namespace i2p
@@ -59,8 +57,7 @@ namespace tunnel
 			TunnelBase& m_Tunnel;
 			TunnelGatewayBuffer m_Buffer;
 			size_t m_NumSentBytes;
-			std::weak_ptr<i2p::transport::TransportSession> m_CurrentTransport;
-			std::future<std::shared_ptr<i2p::transport::TransportSession> > m_PendingTransport;
+			std::unique_ptr<TunnelTransportSender> m_Sender;
 	};
 }
 }