handle incoming packets in batch

libi2pd/SSU2.cpp

@@ -31,7 +31,8 @@ namespace transport
 		std::shared_ptr<const i2p::data::RouterInfo::Address> addr, bool peerTest):
 		TransportSession (in_RemoteRouter, SSU2_CONNECT_TIMEOUT),
 		m_Server (server), m_Address (addr), m_DestConnID (0), m_SourceConnID (0),
-		m_State (eSSU2SessionStateUnknown), m_SendPacketNum (0), m_ReceivePacketNum (0)
+		m_State (eSSU2SessionStateUnknown), m_SendPacketNum (0), m_ReceivePacketNum (0),
+		m_IsDataReceived (false)
 	{
 		m_NoiseState.reset (new i2p::crypto::NoiseSymmetricState);
 		if (in_RemoteRouter && m_Address)
@@ -739,15 +740,11 @@ namespace transport
 		m_LastActivityTimestamp = i2p::util::GetSecondsSinceEpoch ();
 		m_NumReceivedBytes += len;
 		if (UpdateReceivePacketNum (packetNum))
-		{	
-			if (HandlePayload (payload, payloadSize))
-				SendQuickAck (); // TODO: don't send too requently
-		}	
+			HandlePayload (payload, payloadSize);
 	}	
 		
-	bool SSU2Session::HandlePayload (const uint8_t * buf, size_t len)
+	void SSU2Session::HandlePayload (const uint8_t * buf, size_t len)
 	{
-		bool isData = false;
 		size_t offset = 0;
 		while (offset < len)
 		{
@@ -786,18 +783,18 @@ namespace transport
 					memcpy (nextMsg->GetNTCP2Header (), buf + offset, size);
 					nextMsg->FromNTCP2 (); // SSU2 has the same format as NTCP2
 					m_Handler.PutNextMessage (std::move (nextMsg));
-					isData = true;
+					m_IsDataReceived = true;
 					break;	
 				}	
 				case eSSU2BlkFirstFragment:
 					LogPrint (eLogDebug, "SSU2: First fragment");
 					HandleFirstFragment (buf + offset, size);
-					isData = true;
+					m_IsDataReceived = true;
 				break;	
 				case eSSU2BlkFollowOnFragment:
 					LogPrint (eLogDebug, "SSU2: Follow-on fragment");
 					HandleFollowOnFragment (buf + offset, size);
-					isData = true;
+					m_IsDataReceived = true;
 				break;	
 				case eSSU2BlkTermination:
 					LogPrint (eLogDebug, "SSU2: Termination");
@@ -852,8 +849,6 @@ namespace transport
 			}	
 			offset += size;
 		}	
-		m_Handler.Flush ();
-		return isData;
 	}	
 
 	void SSU2Session::HandleAck (const uint8_t * buf, size_t len)
@@ -1216,6 +1211,16 @@ namespace transport
 		}	
 	}
 
+	void SSU2Session::FlushData ()
+	{
+		if (m_IsDataReceived)
+		{	
+			SendQuickAck ();
+			m_Handler.Flush ();
+			m_IsDataReceived = false;
+		}	
+	}
+		
 	SSU2Server::SSU2Server ():
 		RunnableServiceWithWork ("SSU2"), m_ReceiveService ("SSU2r"),
 		m_SocketV4 (m_ReceiveService.GetService ()), m_SocketV6 (m_ReceiveService.GetService ()),
@@ -1325,7 +1330,34 @@ namespace transport
 		{
 			i2p::transport::transports.UpdateReceivedBytes (bytes_transferred);
 			packet->len = bytes_transferred;
-			GetService ().post (std::bind (&SSU2Server::HandleReceivedPacket, this, packet));
+			std::vector<Packet *> packets;
+			packets.push_back (packet);
+
+			boost::system::error_code ec;
+			size_t moreBytes = socket.available (ec);
+			if (!ec)
+			{
+				while (moreBytes && packets.size () < 32)
+				{
+					packet = m_PacketsPool.AcquireMt ();
+					packet->len = socket.receive_from (boost::asio::buffer (packet->buf, SSU2_MTU), packet->from, 0, ec);
+					if (!ec)
+					{
+						i2p::transport::transports.UpdateReceivedBytes (packet->len);
+						packets.push_back (packet);
+						moreBytes = socket.available(ec);
+						if (ec) break;
+					}
+					else
+					{
+						LogPrint (eLogError, "SSU2: receive_from error: code ", ec.value(), ": ", ec.message ());
+						m_PacketsPool.ReleaseMt (packet);
+						break;
+					}
+				}
+			}	
+			
+			GetService ().post (std::bind (&SSU2Server::HandleReceivedPacket, this, packets));
 			Receive (socket);
 		}
 		else
@@ -1342,13 +1374,12 @@ namespace transport
 		}
 	}
 
-	void SSU2Server::HandleReceivedPacket (Packet * packet)
+	void SSU2Server::HandleReceivedPacket (std::vector<Packet *> packets)
 	{
-		if (packet)
-		{
+		for (auto& packet: packets)
 			ProcessNextPacket (packet->buf, packet->len, packet->from);
-			m_PacketsPool.ReleaseMt (packet);
-		}	
+		m_PacketsPool.ReleaseMt (packets);
+		if (m_LastSession) m_LastSession->FlushData ();
 	}	
 		
 	void SSU2Server::AddSession (std::shared_ptr<SSU2Session> session)
@@ -1375,6 +1406,7 @@ namespace transport
 		connID ^= CreateHeaderMask (i2p::context.GetSSU2IntroKey (), buf + (len - 24));
 		if (!m_LastSession || m_LastSession->GetConnID () != connID)
 		{
+			if (m_LastSession) m_LastSession->FlushData ();
 			auto it = m_Sessions.find (connID);
 			if (it != m_Sessions.end ())
 				m_LastSession = it->second;

libi2pd/SSU2.h

@@ -136,6 +136,7 @@ namespace transport
 			void Terminate ();
 			void TerminateByTimeout ();
 			void CleanUp (uint64_t ts);
+			void FlushData ();
 			void Done () override;
 			void SendI2NPMessages (const std::vector<std::shared_ptr<I2NPMessage> >& msgs) override;
 			void Resend (uint64_t ts);
@@ -168,7 +169,7 @@ namespace transport
 			void SendQuickAck ();
 			void SendTermination ();
 			
-			bool HandlePayload (const uint8_t * buf, size_t len); // returns true is contains data
+			void HandlePayload (const uint8_t * buf, size_t len); 
 			void HandleAck (const uint8_t * buf, size_t len);
 			void HandleAckRange (uint32_t firstPacketNum, uint32_t lastPacketNum);
 			bool ExtractEndpoint (const uint8_t * buf, size_t size, boost::asio::ip::udp::endpoint& ep);
@@ -203,6 +204,7 @@ namespace transport
 			std::map<uint32_t, std::shared_ptr<SSU2IncompleteMessage> > m_IncompleteMessages; // I2NP
 			std::list<std::shared_ptr<I2NPMessage> > m_SendQueue;
 			i2p::I2NPMessagesHandler m_Handler;
+			bool m_IsDataReceived;
 	};
 
 	class SSU2Server:  private i2p::util::RunnableServiceWithWork
@@ -255,7 +257,7 @@ namespace transport
 			void Receive (boost::asio::ip::udp::socket& socket);
 			void HandleReceivedFrom (const boost::system::error_code& ecode, size_t bytes_transferred, 
 				Packet * packet, boost::asio::ip::udp::socket& socket);
-			void HandleReceivedPacket (Packet * packet);
+			void HandleReceivedPacket (std::vector<Packet *> packets);
 			void ProcessNextPacket (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint);
 
 			void ScheduleTermination ();