expiring status for tunnels

Tunnel.cpp

@@ -256,7 +256,7 @@ namespace tunnel
 		size_t minReceived = 0;
 		for (auto it : m_InboundTunnels)
 		{
-			if (it.second->IsFailed ()) continue;
+			if (!it.second->IsEstablished ()) continue;
 			if (!tunnel || it.second->GetNumReceivedBytes () < minReceived)
 			{
 				tunnel = it.second;
@@ -274,7 +274,7 @@ namespace tunnel
 		for (auto it: m_OutboundTunnels)
 		{	
 			if (i >= ind) return it;
-			if (!it->IsFailed ())
+			if (it->IsEstablished ())
 			{
 				tunnel = it;
 				i++;
@@ -408,8 +408,12 @@ namespace tunnel
 				it = m_OutboundTunnels.erase (it);
 			}	
 			else 
+			{
+				if (ts + TUNNEL_EXPIRATION_THRESHOLD > (*it)->GetCreationTime () + TUNNEL_EXPIRATION_TIMEOUT)
+					(*it)->SetState (eTunnelStateExpiring);
 				it++;
 			}
+		}
 	
 		if (m_OutboundTunnels.size () < 5) 
 		{
@@ -441,8 +445,12 @@ namespace tunnel
 				it = m_InboundTunnels.erase (it);
 			}	
 			else 
+			{
+				if (ts + TUNNEL_EXPIRATION_THRESHOLD > it->second->GetCreationTime () + TUNNEL_EXPIRATION_TIMEOUT)
+					it->second->SetState (eTunnelStateExpiring);
 				it++;
 			}
+		}
 
 		if (m_InboundTunnels.empty ())
 		{

Tunnel.h

@@ -22,6 +22,7 @@ namespace i2p
 namespace tunnel
 {	
 	const int TUNNEL_EXPIRATION_TIMEOUT = 660; // 11 minutes	
+	const int TUNNEL_EXPIRATION_THRESHOLD = 60; // 1 minute	
 	const int TUNNEL_CREATION_TIMEOUT = 20; // 20 seconds
 	const int STANDARD_NUM_RECORDS = 5; // in VariableTunnelBuild message
 
@@ -30,7 +31,8 @@ namespace tunnel
 		eTunnelStatePending,
 		eTunnelStateEstablished,
 		eTunnelStateTestFailed,
-		eTunnelStateFailed
+		eTunnelStateFailed,
+		eTunnelStateExpiring
 	};	
 	
 	class OutboundTunnel;

TunnelPool.h

@@ -19,7 +19,6 @@ namespace tunnel
 	class InboundTunnel;
 	class OutboundTunnel;
 
-	const int TUNNEL_EXPIRATION_THRESHOLD = 60; // 1 minute
 	class TunnelPool // per local destination
 	{
 		public: