try next floodfill for router request on demand

libi2pd/NetDbRequests.cpp

@@ -17,6 +17,17 @@ namespace i2p
 {
 namespace data
 {
+	RequestedDestination::RequestedDestination (const IdentHash& destination, bool isExploratory, bool direct):
+		m_Destination (destination), m_IsExploratory (isExploratory), m_IsDirect (direct), 
+		m_CreationTime (i2p::util::GetSecondsSinceEpoch ()), m_LastRequestTime (0) 
+	{
+	}
+		
+	RequestedDestination::~RequestedDestination () 
+	{ 
+		if (m_RequestComplete) m_RequestComplete (nullptr); 
+	}
+		
 	std::shared_ptr<I2NPMessage> RequestedDestination::CreateRequestMessage (std::shared_ptr<const RouterInfo> router,
 		std::shared_ptr<const i2p::tunnel::InboundTunnel> replyTunnel)
 	{
@@ -29,7 +40,7 @@ namespace data
 			msg = i2p::CreateRouterInfoDatabaseLookupMsg(m_Destination, i2p::context.GetIdentHash(), 0, m_IsExploratory, &m_ExcludedPeers);
 		if(router)
 			m_ExcludedPeers.insert (router->GetIdentHash ());
-		m_CreationTime = i2p::util::GetSecondsSinceEpoch ();
+		m_LastRequestTime = i2p::util::GetSecondsSinceEpoch ();
 		return msg;
 	}
 
@@ -38,7 +49,7 @@ namespace data
 		auto msg = i2p::CreateRouterInfoDatabaseLookupMsg (m_Destination,
 			i2p::context.GetRouterInfo ().GetIdentHash () , 0, false, &m_ExcludedPeers);
 		m_ExcludedPeers.insert (floodfill);
-		m_CreationTime = i2p::util::GetSecondsSinceEpoch ();
+		m_LastRequestTime = i2p::util::GetSecondsSinceEpoch ();
 		return msg;
 	}
 
@@ -100,7 +111,9 @@ namespace data
 					else
 						ret.first->second->SetRequestComplete (requestComplete);
 				}
-				
+				if (i2p::util::GetSecondsSinceEpoch () > ret.first->second->GetLastRequestTime () + MIN_REQUEST_TIME)
+					if (!SendNextRequest (ret.first->second)) // try next floodfill
+						m_RequestedDestinations.erase (ret.first); // delete request if failed
 				return nullptr;
 			}	
 		}
@@ -147,7 +160,7 @@ namespace data
 			bool done = false;
 			if (ts < dest->GetCreationTime () + MAX_REQUEST_TIME) // request becomes worthless
 			{
-				if (ts > dest->GetCreationTime () + MIN_REQUEST_TIME) // retry in no response after min interval
+				if (ts > dest->GetLastRequestTime () + MIN_REQUEST_TIME) // try next floodfill if no response after min interval
 					done = !SendNextRequest (dest);
 			}
 			else // delete obsolete request

libi2pd/NetDbRequests.h

@@ -30,9 +30,8 @@ namespace data
 
 			typedef std::function<void (std::shared_ptr<RouterInfo>)> RequestComplete;
 
-			RequestedDestination (const IdentHash& destination, bool isExploratory = false, bool direct = true):
-				m_Destination (destination), m_IsExploratory (isExploratory), m_IsDirect (direct), m_CreationTime (0) {};
-			~RequestedDestination () { if (m_RequestComplete) m_RequestComplete (nullptr); };
+			RequestedDestination (const IdentHash& destination, bool isExploratory = false, bool direct = true);
+			~RequestedDestination ();
 
 			const IdentHash& GetDestination () const { return m_Destination; };
 			int GetNumExcludedPeers () const { return m_ExcludedPeers.size (); };
@@ -42,6 +41,7 @@ namespace data
 			bool IsDirect () const { return m_IsDirect; };
 			bool IsExcluded (const IdentHash& ident) const { return m_ExcludedPeers.count (ident); };
 			uint64_t GetCreationTime () const { return m_CreationTime; };
+			uint64_t GetLastRequestTime () const { return m_LastRequestTime; };
 			std::shared_ptr<I2NPMessage> CreateRequestMessage (std::shared_ptr<const RouterInfo>, std::shared_ptr<const i2p::tunnel::InboundTunnel> replyTunnel);
 			std::shared_ptr<I2NPMessage> CreateRequestMessage (const IdentHash& floodfill);
 
@@ -56,7 +56,7 @@ namespace data
 			IdentHash m_Destination;
 			bool m_IsExploratory, m_IsDirect;
 			std::set<IdentHash> m_ExcludedPeers;
-			uint64_t m_CreationTime;
+			uint64_t m_CreationTime, m_LastRequestTime; // in seconds
 			RequestComplete m_RequestComplete;
 	};