implement i2p.streaming.connectDelay option

libi2pd/Destination.cpp

@@ -715,8 +715,8 @@ namespace client
 	}
 
 	ClientDestination::ClientDestination (const i2p::data::PrivateKeys& keys, bool isPublic, const std::map<std::string, std::string> * params):
-		LeaseSetDestination (isPublic, params),
-		m_Keys (keys), m_DatagramDestination (nullptr), m_RefCounter (0),
+		LeaseSetDestination (isPublic, params), m_Keys (keys), m_StreamingAckDelay (DEFAULT_INITIAL_ACK_DELAY),
+		m_DatagramDestination (nullptr), m_RefCounter (0),
 		m_ReadyChecker(GetService())
 	{
 		if (isPublic)
@@ -727,6 +727,14 @@ namespace client
 		m_Decryptor = m_Keys.CreateDecryptor (m_EncryptionPrivateKey); 
 		if (isPublic)
 			LogPrint (eLogInfo, "Destination: Local address ", GetIdentHash().ToBase32 (), " created");
+
+		// extract streaming params
+		if (params) 
+		{
+			auto it = params->find (I2CP_PARAM_STREAMING_INITIAL_ACK_DELAY);
+			if (it != params->end ())
+				m_StreamingAckDelay = std::stoi(it->second);
+		}
 	}
 
 	ClientDestination::~ClientDestination ()

libi2pd/Destination.h

@@ -58,6 +58,10 @@ namespace client
 	const char I2CP_PARAM_MAX_TUNNEL_LATENCY[] = "latency.max";
 	const int DEFAULT_MAX_TUNNEL_LATENCY = 0;
 
+	// streaming
+	const char I2CP_PARAM_STREAMING_INITIAL_ACK_DELAY[] = "i2p.streaming.initialAckDelay";
+	const int DEFAULT_INITIAL_ACK_DELAY = 200; // milliseconds
+
 	typedef std::function<void (std::shared_ptr<i2p::stream::Stream> stream)> StreamRequestComplete;
 
 	class LeaseSetDestination: public i2p::garlic::GarlicDestination,
@@ -199,6 +203,7 @@ namespace client
 			void StopAcceptingStreams ();
 			bool IsAcceptingStreams () const;
 			void AcceptOnce (const i2p::stream::StreamingDestination::Acceptor& acceptor);
+			int GetStreamingAckDelay () const { return m_StreamingAckDelay; }
 
 			// datagram
       i2p::datagram::DatagramDestination * GetDatagramDestination () const { return m_DatagramDestination; };
@@ -230,6 +235,7 @@ namespace client
 			uint8_t m_EncryptionPublicKey[256], m_EncryptionPrivateKey[256];
 			std::shared_ptr<i2p::crypto::CryptoKeyDecryptor> m_Decryptor;
 
+			int m_StreamingAckDelay;
 			std::shared_ptr<i2p::stream::StreamingDestination> m_StreamingDestination; // default
 			std::map<uint16_t, std::shared_ptr<i2p::stream::StreamingDestination> > m_StreamingDestinationsByPorts;
       		i2p::datagram::DatagramDestination * m_DatagramDestination;

libi2pd/Streaming.cpp

@@ -62,6 +62,7 @@ namespace stream
 		m_RemoteLeaseSet (remote), m_ReceiveTimer (m_Service), m_ResendTimer (m_Service),
 		m_AckSendTimer (m_Service),  m_NumSentBytes (0), m_NumReceivedBytes (0), m_Port (port),
 		m_WindowSize (MIN_WINDOW_SIZE), m_RTT (INITIAL_RTT), m_RTO (INITIAL_RTO),
+		m_AckDelay (local.GetOwner ()->GetStreamingAckDelay ()),
 		m_LastWindowSizeIncreaseTime (0), m_NumResendAttempts (0)
 	{
 		RAND_bytes ((uint8_t *)&m_RecvStreamID, 4);
@@ -73,7 +74,8 @@ namespace stream
 		m_Status (eStreamStatusNew), m_IsAckSendScheduled (false), m_LocalDestination (local),
 		m_ReceiveTimer (m_Service), m_ResendTimer (m_Service), m_AckSendTimer (m_Service),
 		m_NumSentBytes (0), m_NumReceivedBytes (0), m_Port (0),  m_WindowSize (MIN_WINDOW_SIZE),
-		m_RTT (INITIAL_RTT), m_RTO (INITIAL_RTO), m_LastWindowSizeIncreaseTime (0), m_NumResendAttempts (0)
+		m_RTT (INITIAL_RTT), m_RTO (INITIAL_RTO), m_AckDelay (local.GetOwner ()->GetStreamingAckDelay ()),
+		m_LastWindowSizeIncreaseTime (0), m_NumResendAttempts (0)
 	{
 		RAND_bytes ((uint8_t *)&m_RecvStreamID, 4);
 	}
@@ -161,7 +163,7 @@ namespace stream
 				{
 					m_IsAckSendScheduled = true;
 					auto ackTimeout = m_RTT/10;
-					if (ackTimeout > ACK_SEND_TIMEOUT) ackTimeout = ACK_SEND_TIMEOUT;
+					if (ackTimeout > m_AckDelay) ackTimeout = m_AckDelay;
 					m_AckSendTimer.expires_from_now (boost::posix_time::milliseconds(ackTimeout));
 					m_AckSendTimer.async_wait (std::bind (&Stream::HandleAckSendTimer,
 						shared_from_this (), std::placeholders::_1));
@@ -199,7 +201,7 @@ namespace stream
 				{
 					// wait for SYN
 					m_IsAckSendScheduled = true;
-					m_AckSendTimer.expires_from_now (boost::posix_time::milliseconds(ACK_SEND_TIMEOUT));
+					m_AckSendTimer.expires_from_now (boost::posix_time::milliseconds(SYN_TIMEOUT));
 					m_AckSendTimer.async_wait (std::bind (&Stream::HandleAckSendTimer,
 						shared_from_this (), std::placeholders::_1));
 				}
@@ -805,7 +807,7 @@ namespace stream
 		{
 			if (m_LastReceivedSequenceNumber < 0)
 			{
-				LogPrint (eLogWarning, "Streaming: SYN has not been received after ", ACK_SEND_TIMEOUT, " milliseconds after follow on, terminate rSID=", m_RecvStreamID, ", sSID=", m_SendStreamID);
+				LogPrint (eLogWarning, "Streaming: SYN has not been received after ", SYN_TIMEOUT, " milliseconds after follow on, terminate rSID=", m_RecvStreamID, ", sSID=", m_SendStreamID);
 				m_Status = eStreamStatusReset;
 				Close ();
 				return;

libi2pd/Streaming.h

@@ -42,13 +42,13 @@ namespace stream
 	const size_t STREAMING_MTU = 1730;
 	const size_t MAX_PACKET_SIZE = 4096;
 	const size_t COMPRESSION_THRESHOLD_SIZE = 66;	
-	const int ACK_SEND_TIMEOUT = 200; // in milliseconds
 	const int MAX_NUM_RESEND_ATTEMPTS = 6;	
 	const int WINDOW_SIZE = 6; // in messages
 	const int MIN_WINDOW_SIZE = 1;
 	const int MAX_WINDOW_SIZE = 128;		
 	const int INITIAL_RTT = 8000; // in milliseconds
 	const int INITIAL_RTO = 9000; // in milliseconds
+	const int SYN_TIMEOUT = 200; // how long we wait for SYN after follow-on, in milliseconds
 	const size_t MAX_PENDING_INCOMING_BACKLOG = 128;
 	const int PENDING_INCOMING_TIMEOUT = 10; // in seconds
 	const int MAX_RECEIVE_TIMEOUT = 30; // in seconds 
@@ -242,7 +242,7 @@ namespace stream
 
 			std::mutex m_SendBufferMutex;
 			SendBufferQueue m_SendBuffer;
-			int m_WindowSize, m_RTT, m_RTO;
+			int m_WindowSize, m_RTT, m_RTO, m_AckDelay;
 			uint64_t m_LastWindowSizeIncreaseTime;
 			int m_NumResendAttempts;
 	};

libi2pd_client/ClientContext.cpp

@@ -431,6 +431,7 @@ namespace client
 		options[I2CP_PARAM_TAGS_TO_SEND] = GetI2CPOption (section, I2CP_PARAM_TAGS_TO_SEND, DEFAULT_TAGS_TO_SEND);
 		options[I2CP_PARAM_MIN_TUNNEL_LATENCY] = GetI2CPOption(section, I2CP_PARAM_MIN_TUNNEL_LATENCY, DEFAULT_MIN_TUNNEL_LATENCY);
 		options[I2CP_PARAM_MAX_TUNNEL_LATENCY] = GetI2CPOption(section, I2CP_PARAM_MAX_TUNNEL_LATENCY, DEFAULT_MAX_TUNNEL_LATENCY);
+		options[I2CP_PARAM_STREAMING_INITIAL_ACK_DELAY] = GetI2CPOption(section, I2CP_PARAM_STREAMING_INITIAL_ACK_DELAY, DEFAULT_INITIAL_ACK_DELAY);
 	}
 
 	void ClientContext::ReadI2CPOptionsFromConfig (const std::string& prefix, std::map<std::string, std::string>& options) const

libi2pd_client/ClientContext.h

@@ -90,8 +90,8 @@ namespace client
 			template<typename Section, typename Type>
 			std::string GetI2CPOption (const Section& section, const std::string& name, const Type& value) const;
 			template<typename Section>
-			void ReadI2CPOptions (const Section& section, std::map<std::string, std::string>& options) const;
-			void ReadI2CPOptionsFromConfig (const std::string& prefix, std::map<std::string, std::string>& options) const;
+			void ReadI2CPOptions (const Section& section, std::map<std::string, std::string>& options) const; // for tunnels
+			void ReadI2CPOptionsFromConfig (const std::string& prefix, std::map<std::string, std::string>& options) const; // for HTTP and SOCKS proxy
 
 			void CleanupUDP(const boost::system::error_code & ecode);
 			void ScheduleCleanupUDP();