renew LeaseSet's I2NP message ID and timestamp before sending

I2NPProtocol.cpp

@@ -31,17 +31,17 @@ namespace i2p
 		delete msg;
 	}	
 
+	static uint32_t I2NPmsgID = 0; // TODO: create class
 	void FillI2NPMessageHeader (I2NPMessage * msg, I2NPMessageType msgType, uint32_t replyMsgID)
 	{
-		static uint32_t msgID = 0;
 		I2NPHeader * header = msg->GetHeader ();
 		header->typeID = msgType;
 		if (replyMsgID) // for tunnel creation
 			header->msgID = htobe32 (replyMsgID); 
 		else
 		{	
-			header->msgID = htobe32 (msgID);
+			header->msgID = htobe32 (I2NPmsgID);
-			msgID++;
+			I2NPmsgID++;
 		}	
 		header->expiration = htobe64 (i2p::util::GetMillisecondsSinceEpoch () + 5000); // TODO: 5 secs is a magic number
 		int len = msg->GetLength () - sizeof (I2NPHeader);
@@ -51,6 +51,17 @@ namespace i2p
 		header->chks = hash[0];
 	}	
 
+	void RenewI2NPMessageHeader (I2NPMessage * msg)
+	{
+		if (msg)
+		{
+			I2NPHeader * header = msg->GetHeader ();
+			header->msgID = htobe32 (I2NPmsgID);
+			I2NPmsgID++;
+			header->expiration = htobe64 (i2p::util::GetMillisecondsSinceEpoch () + 5000); 		
+		}
+	}
+
 	I2NPMessage * CreateI2NPMessage (I2NPMessageType msgType, const uint8_t * buf, int len, uint32_t replyMsgID)
 	{
 		I2NPMessage * msg = NewI2NPMessage ();

I2NPProtocol.h

@@ -142,6 +142,7 @@ namespace tunnel
 	I2NPMessage * NewI2NPMessage ();
 	void DeleteI2NPMessage (I2NPMessage * msg);
 	void FillI2NPMessageHeader (I2NPMessage * msg, I2NPMessageType msgType, uint32_t replyMsgID = 0);
+	void RenewI2NPMessageHeader (I2NPMessage * msg);
 	I2NPMessage * CreateI2NPMessage (I2NPMessageType msgType, const uint8_t * buf, int len, uint32_t replyMsgID = 0);	
 	I2NPMessage * CreateI2NPMessage (const uint8_t * buf, int len);
 	

Streaming.cpp

@@ -369,10 +369,10 @@ namespace stream
 		
 	const I2NPMessage * StreamingDestination::GetLeaseSet ()
 	{
-		// TODO: LeaseSet is always re-created. ivestigate
+		if (!m_LeaseSet)
-		if (m_LeaseSet)
+			m_LeaseSet = CreateLeaseSet ();
-			DeleteI2NPMessage (m_LeaseSet);
+		else
-		m_LeaseSet = CreateLeaseSet ();
+			RenewI2NPMessageHeader (m_LeaseSet); 
 		return m_LeaseSet;
 	}