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

@@ -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

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

@@ -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;