Configurable minimum successful tunnels

libi2pd/Config.cpp

@@ -78,6 +78,7 @@ namespace config {
 			("limits.coresize", value<uint32_t>()->default_value(0),          "Maximum size of corefile in Kb (0 - use system limit)")
 			("limits.openfiles", value<uint16_t>()->default_value(0),         "Maximum number of open files (0 - use system default)")
 			("limits.transittunnels", value<uint16_t>()->default_value(5000), "Maximum active transit tunnels (default:5000)")
+			("limits.zombies", value<double>()->default_value(0),             "Minimum percentage of successfully created tunnels under which tunnel cleanup is paused (default [%]: 0.00)")
 			("limits.ntcpsoft", value<uint16_t>()->default_value(0),          "Ignored")
 			("limits.ntcphard", value<uint16_t>()->default_value(0),          "Ignored")
 			("limits.ntcpthreads", value<uint16_t>()->default_value(1),       "Ignored")

libi2pd/NetDb.cpp

@@ -245,19 +245,19 @@ namespace data
 						updated = false;
 						m_Requests.RequestComplete (ident, r);
 						return r;
-					}	
+					}
 					if (r->IsUnreachable ())
 					{
 						// delete router as invalid after update
 						m_RouterInfos.erase (ident);
 						if (wasFloodfill)
-						{	
+						{
 							std::unique_lock<std::mutex> l(m_FloodfillsMutex);
 							m_Floodfills.Remove (r->GetIdentHash ());
-						}	
+						}
 						m_Requests.RequestComplete (ident, nullptr);
-						return nullptr;	
+						return nullptr;
-					}	
+					}
 				}
 				LogPrint (eLogInfo, "NetDb: RouterInfo updated: ", ident.ToBase64());
 				if (wasFloodfill != r->IsFloodfill ()) // if floodfill status updated
@@ -419,7 +419,7 @@ namespace data
 				if (profile)
 					profile->Unreachable ();
 			}
-		}	
+		}
 	}
 
 	void NetDb::ExcludeReachableTransports (const IdentHash& ident, RouterInfo::CompatibleTransports transports)
@@ -429,9 +429,9 @@ namespace data
 		{
 			std::unique_lock<std::mutex> l(m_RouterInfosMutex);
 			r->ExcludeReachableTransports (transports);
-		}	
+		}
-	}	
+	}
-	
+
 	void NetDb::Reseed ()
 	{
 		if (!m_Reseeder)
@@ -607,7 +607,9 @@ namespace data
 		uint64_t expirationTimeout = NETDB_MAX_EXPIRATION_TIMEOUT*1000LL;
 		uint64_t ts = i2p::util::GetMillisecondsSinceEpoch();
 		auto uptime = i2p::context.GetUptime ();
-		bool isLowRate = false; // i2p::tunnel::tunnels.GetTunnelCreationSuccessRate () < NETDB_MIN_TUNNEL_CREATION_SUCCESS_RATE;
+		double minTunnelCreationSuccessRate;
+		i2p::config::GetOption("limits.zombies", minTunnelCreationSuccessRate);
+		bool isLowRate = i2p::tunnel::tunnels.GetPreciseTunnelCreationSuccessRate () < minTunnelCreationSuccessRate;
 		// routers don't expire if less than 90 or uptime is less than 1 hour
 		bool checkForExpiration = total > NETDB_MIN_ROUTERS && uptime > 600; // 10 minutes
 		if (checkForExpiration && uptime > 3600) // 1 hour
@@ -622,12 +624,12 @@ namespace data
 			if (it.second->IsUpdated ())
 			{
 				if (it.second->GetBuffer ())
-				{    
+				{
 					// we have something to save
 					it.second->SaveToFile (m_Storage.Path(ident));
 					it.second->SetUnreachable (false);
 					it.second->DeleteBuffer ();
-				}	
+				}
 				it.second->SetUpdated (false);
 				updatedCount++;
 				continue;
@@ -639,7 +641,7 @@ namespace data
 				(it.second->IsFloodfill () && totalFloodfills - deletedFloodfillsCount < NETDB_MIN_FLOODFILLS)))
 				it.second->SetUnreachable (false);
 			if (!it.second->IsUnreachable ())
-			{	
+			{
 				// find & mark expired routers
 				if (!it.second->GetCompatibleTransports (true)) // non reachable by any transport
 					it.second->SetUnreachable (true);
@@ -652,7 +654,7 @@ namespace data
 				}
 				if (it.second->IsUnreachable () && i2p::transport::transports.IsConnected (it.second->GetIdentHash ()))
 					it.second->SetUnreachable (false); // don't expire connected router
-			}	
+			}
 
 			if (it.second->IsUnreachable ())
 			{
@@ -667,7 +669,7 @@ namespace data
 		m_RouterInfoBuffersPool.CleanUpMt ();
 		m_RouterInfoAddressesPool.CleanUpMt ();
 		m_RouterInfoAddressVectorsPool.CleanUpMt ();
-		m_IdentitiesPool.CleanUpMt ();	
+		m_IdentitiesPool.CleanUpMt ();
 
 		if (updatedCount > 0)
 			LogPrint (eLogInfo, "NetDb: Saved ", updatedCount, " new/updated routers");
@@ -682,10 +684,10 @@ namespace data
 					if (it->second->IsUnreachable ())
 						it = m_RouterInfos.erase (it);
 					else
-					{	
+					{
 						it->second->DropProfile ();
 						it++;
-					}	
+					}
 				}
 			}
 			// clean up expired floodfills or not floodfills anymore
@@ -724,9 +726,9 @@ namespace data
 				if (outbound &&	inbound)
 				{
 					auto msg = dest->CreateRequestMessage (floodfill, inbound);
-					outbound->SendTunnelDataMsgTo (floodfill->GetIdentHash (), 0, 
+					outbound->SendTunnelDataMsgTo (floodfill->GetIdentHash (), 0,
 						i2p::garlic::WrapECIESX25519MessageForRouter (msg, floodfill->GetIdentity ()->GetEncryptionPublicKey ()));
-				}	
+				}
 				else
 				{
 					LogPrint (eLogError, "NetDb: ", destination.ToBase64(), " destination requested, but no tunnels found");
@@ -794,7 +796,7 @@ namespace data
 			uint32_t tunnelID = bufbe32toh (buf + offset);
 			offset += 4;
 			if (replyToken != 0xFFFFFFFFU) // if not caught on OBEP or IBGW
-			{	
+			{
 				auto deliveryStatus = CreateDeliveryStatusMsg (replyToken);
 				if (!tunnelID) // send response directly
 					transports.SendMessage (buf + offset, deliveryStatus);
@@ -807,7 +809,7 @@ namespace data
 					else
 						LogPrint (eLogWarning, "NetDb: No outbound tunnels for DatabaseStore reply found");
 				}
-			}	
+			}
 			offset += 32;
 		}
 		// we must send reply back before this check
@@ -1315,16 +1317,16 @@ namespace data
 					return r && !r->IsUnreachable () && !r->GetProfile ()->IsUnreachable () &&
 						!excluded.count (r->GetIdentHash ());
 				});
-		}	
+		}
 		if (v.empty ()) return res;
-		
+
 		XORMetric ourMetric;
 		if (closeThanUsOnly) ourMetric = destKey ^ i2p::context.GetIdentHash ();
 		for (auto& it: v)
 		{
 			if (closeThanUsOnly && ourMetric < (destKey ^ it->GetIdentHash ())) break;
 			res.push_back (it->GetIdentHash ());
-		}	
+		}
 		return res;
 	}
 
@@ -1367,10 +1369,10 @@ namespace data
 			std::unique_lock<std::mutex> l(m_RouterInfosMutex);
 			for (auto& it: m_RouterInfos)
 				it.second->UpdateIntroducers (ts);
-		}	
+		}
 		SaveUpdated ();
-	}	
+	}
-	
+
 	void NetDb::ManageLeaseSets ()
 	{
 		auto ts = i2p::util::GetMillisecondsSinceEpoch ();

libi2pd/NetDb.hpp

@@ -38,7 +38,6 @@ namespace data
 {
 	const int NETDB_MIN_ROUTERS = 90;
 	const int NETDB_MIN_FLOODFILLS = 5;
-	const int NETDB_MIN_TUNNEL_CREATION_SUCCESS_RATE = 8; // in percents
 	const int NETDB_FLOODFILL_EXPIRATION_TIMEOUT = 60 * 60; // 1 hour, in seconds
 	const int NETDB_MIN_EXPIRATION_TIMEOUT = 90 * 60; // 1.5 hours
 	const int NETDB_MAX_EXPIRATION_TIMEOUT = 27 * 60 * 60; // 27 hours

libi2pd/Tunnel.h

@@ -45,7 +45,7 @@ namespace tunnel
 	const int TUNNEL_MANAGE_INTERVAL = 15; // in seconds
 	const int TUNNEL_POOLS_MANAGE_INTERVAL = 5; // in seconds
 	const int TUNNEL_MEMORY_POOL_MANAGE_INTERVAL = 120; // in seconds
-	
+
 	const size_t I2NP_TUNNEL_MESSAGE_SIZE = TUNNEL_DATA_MSG_SIZE + I2NP_HEADER_SIZE + 34; // reserved for alignment and NTCP 16 + 6 + 12
 	const size_t I2NP_TUNNEL_ENPOINT_MESSAGE_SIZE = 2*TUNNEL_DATA_MSG_SIZE + I2NP_HEADER_SIZE + TUNNEL_GATEWAY_HEADER_SIZE + 28; // reserved for alignment and NTCP 16 + 6 + 6
 
@@ -232,8 +232,8 @@ namespace tunnel
 
 			void SetMaxNumTransitTunnels (uint16_t maxNumTransitTunnels);
 			uint16_t GetMaxNumTransitTunnels () const { return m_MaxNumTransitTunnels; };
-			bool IsTooManyTransitTunnels () const { return m_TransitTunnels.size () >= m_MaxNumTransitTunnels; }; 
+			bool IsTooManyTransitTunnels () const { return m_TransitTunnels.size () >= m_MaxNumTransitTunnels; };
-			
+
 		private:
 
 			template<class TTunnel>
@@ -292,7 +292,7 @@ namespace tunnel
 			i2p::util::Queue<std::shared_ptr<I2NPMessage> > m_Queue;
 			i2p::util::MemoryPoolMt<I2NPMessageBuffer<I2NP_TUNNEL_ENPOINT_MESSAGE_SIZE> > m_I2NPTunnelEndpointMessagesMemoryPool;
 			i2p::util::MemoryPoolMt<I2NPMessageBuffer<I2NP_TUNNEL_MESSAGE_SIZE> > m_I2NPTunnelMessagesMemoryPool;
-			uint16_t m_MaxNumTransitTunnels; 
+			uint16_t m_MaxNumTransitTunnels;
 			// count of tunnels for total TCSR algorithm
 			int m_TotalNumSuccesiveTunnelCreations, m_TotalNumFailedTunnelCreations;
 			double m_TunnelCreationSuccessRate;
@@ -311,6 +311,7 @@ namespace tunnel
 
 			int GetQueueSize () { return m_Queue.GetSize (); };
 			int GetTunnelCreationSuccessRate () const { return std::round(m_TunnelCreationSuccessRate * 100); } // in percents
+			double GetPreciseTunnelCreationSuccessRate () const { return m_TunnelCreationSuccessRate * 100; } // in percents
 			int GetTotalTunnelCreationSuccessRate () const // in percents
 			{
 				int totalNum = m_TotalNumSuccesiveTunnelCreations + m_TotalNumFailedTunnelCreations;