add deferred ready checking for destination

libi2pd/Destination.cpp

@@ -15,7 +15,8 @@ namespace client
 	LeaseSetDestination::LeaseSetDestination (bool isPublic, const std::map<std::string, std::string> * params):
 		m_IsRunning (false), m_Thread (nullptr), m_IsPublic (isPublic),
 		m_PublishReplyToken (0), m_LastSubmissionTime (0), m_PublishConfirmationTimer (m_Service),
-		m_PublishVerificationTimer (m_Service), m_PublishDelayTimer (m_Service), m_CleanupTimer (m_Service)
+		m_PublishVerificationTimer (m_Service), m_PublishDelayTimer (m_Service), m_CleanupTimer (m_Service),
+		m_ReadyCheckTimer(m_Service)
 	{
 		int inLen   = DEFAULT_INBOUND_TUNNEL_LENGTH;
 		int inQty   = DEFAULT_INBOUND_TUNNELS_QUANTITY;
@@ -118,7 +119,9 @@ namespace client
 			m_CleanupTimer.async_wait (std::bind (&LeaseSetDestination::HandleCleanupTimer,
 				shared_from_this (), std::placeholders::_1));
 			m_Thread = new std::thread (std::bind (&LeaseSetDestination::Run, shared_from_this ()));
-			
+			m_ReadyCheckTimer.expires_from_now(boost::posix_time::seconds (1));
+			m_ReadyCheckTimer.async_wait(std::bind(&LeaseSetDestination::HandleReadyCheckTimer,
+																						 shared_from_this (), std::placeholders::_1));
 			return true;
 		}
 		else
@@ -132,6 +135,7 @@ namespace client
 			m_CleanupTimer.cancel ();
 			m_PublishConfirmationTimer.cancel ();
 			m_PublishVerificationTimer.cancel ();
+			m_ReadyCheckTimer.cancel ();
 
 			m_IsRunning = false;
 			if (m_Pool)
@@ -231,6 +235,11 @@ namespace client
 		}
 	}
 
+	void LeaseSetDestination::AddReadyCallback(ReadyCallback cb)
+	{
+		m_ReadyCallbacks.push_back(cb);
+	}
+
 	void LeaseSetDestination::UpdateLeaseSet ()
 	{
 		int numTunnels = m_Pool->GetNumInboundTunnels () + 2; // 2 backup tunnels
@@ -676,6 +685,30 @@ namespace client
 		}
 	}
 
+	void LeaseSetDestination::HandleReadyCheckTimer(const boost::system::error_code & ec)
+	{
+		if (ec != boost::asio::error::operation_aborted)
+		{
+			// TODO: locking ?
+			if(IsReady())
+			{
+				for (auto & itr : m_ReadyCallbacks)
+				{
+					itr(ec);
+				}
+				m_ReadyCallbacks.clear();
+			}
+		}
+		else
+		{
+			for (auto & itr : m_ReadyCallbacks)
+			{
+					itr(ec);
+			}
+			m_ReadyCallbacks.clear();
+		}
+	}
+
 	void LeaseSetDestination::CleanupRemoteLeaseSets ()
 	{
 		auto ts = i2p::util::GetMillisecondsSinceEpoch ();
@@ -812,6 +845,8 @@ namespace client
 			LogPrint (eLogError, "Destination: request callback is not specified in CreateStream");
 			return;
 		}
+		if(IsReady())
+		{
 			auto leaseSet = FindLeaseSet (dest);
 			if (leaseSet)
 				streamRequestComplete(CreateStream (leaseSet, port));
@@ -828,6 +863,17 @@ namespace client
 					});
 			}
 		}
+		else
+		{
+			// call if tunnel is not ready
+			AddReadyCallback([&](const boost::system::error_code & ec) {
+					if(ec)
+						streamRequestComplete(nullptr);
+					else
+						CreateStream(streamRequestComplete, dest, port);
+			});
+		}
+	}
 
 	std::shared_ptr<i2p::stream::Stream> ClientDestination::CreateStream (std::shared_ptr<const i2p::data::LeaseSet> remote, int port)
 	{

libi2pd/Destination.h

@@ -63,6 +63,7 @@ namespace client
 		public std::enable_shared_from_this<LeaseSetDestination>
 	{
 		typedef std::function<void (std::shared_ptr<i2p::data::LeaseSet> leaseSet)> RequestComplete;
+    typedef std::function<void (const boost::system::error_code &)> ReadyCallback;
 		// leaseSet = nullptr means not found
 		struct LeaseSetRequest
 		{
@@ -108,6 +109,8 @@ namespace client
 			void ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg);
 			void SetLeaseSetUpdated ();
 
+    void AddReadyCallback(ReadyCallback cb);
+
 		protected:
 
 			void SetLeaseSet (i2p::data::LocalLeaseSet * newLeaseSet);
@@ -132,6 +135,7 @@ namespace client
 			bool SendLeaseSetRequest (const i2p::data::IdentHash& dest, std::shared_ptr<const i2p::data::RouterInfo>  nextFloodfill, std::shared_ptr<LeaseSetRequest> request);
 			void HandleRequestTimoutTimer (const boost::system::error_code& ecode, const i2p::data::IdentHash& dest);
     void HandleCleanupTimer (const boost::system::error_code& ecode);
+    void HandleReadyCheckTimer (const boost::system::error_code& ecode);
 			void CleanupRemoteLeaseSets ();
 
 		private:
@@ -152,7 +156,9 @@ namespace client
 			std::set<i2p::data::IdentHash> m_ExcludedFloodfills; // for publishing
 
 			boost::asio::deadline_timer m_PublishConfirmationTimer, m_PublishVerificationTimer,
-				m_PublishDelayTimer, m_CleanupTimer;
+				m_PublishDelayTimer, m_CleanupTimer, m_ReadyCheckTimer;
+
+    std::vector<ReadyCallback> m_ReadyCallbacks;
 
 		public: