build client tunnels through confimed routers only if low rate

libi2pd/NetDb.cpp

@@ -622,8 +622,8 @@ namespace data
 		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
+		bool checkForExpiration = total > NETDB_MIN_ROUTERS && uptime > NETDB_CHECK_FOR_EXPIRATION_UPTIME; // 10 minutes
-		if (checkForExpiration && uptime > 3600) // 1 hour
+		if (checkForExpiration && uptime > i2p::transport::SSU2_TO_INTRODUCER_SESSION_DURATION) // 1 hour
 			expirationTimeout = i2p::context.IsFloodfill () ? NETDB_FLOODFILL_EXPIRATION_TIMEOUT*1000LL :
 				NETDB_MIN_EXPIRATION_TIMEOUT*1000LL + (NETDB_MAX_EXPIRATION_TIMEOUT - NETDB_MIN_EXPIRATION_TIMEOUT)*1000LL*NETDB_MIN_ROUTERS/total;
 
@@ -1268,8 +1268,10 @@ namespace data
 	std::shared_ptr<const RouterInfo> NetDb::GetHighBandwidthRandomRouter (std::shared_ptr<const RouterInfo> compatibleWith, 
 		bool reverse, bool endpoint) const
 	{
+		bool checkIsReal = i2p::tunnel::tunnels.GetPreciseTunnelCreationSuccessRate () < NETDB_TUNNEL_CREATION_RATE_THRESHOLD && // too low rate
+			context.GetUptime () > NETDB_CHECK_FOR_EXPIRATION_UPTIME; // after 10 minutes uptime
 		return GetRandomRouter (
-			[compatibleWith, reverse, endpoint](std::shared_ptr<const RouterInfo> router)->bool
+			[compatibleWith, reverse, endpoint, checkIsReal](std::shared_ptr<const RouterInfo> router)->bool
 			{
 				return !router->IsHidden () && router != compatibleWith &&
 					(reverse ? (compatibleWith->IsReachableFrom (*router) && router->GetCompatibleTransports (true)) :
@@ -1277,6 +1279,7 @@ namespace data
 					(router->GetCaps () & RouterInfo::eHighBandwidth) &&
 					router->GetVersion () >= NETDB_MIN_HIGHBANDWIDTH_VERSION &&
 					router->IsECIES () && !router->IsHighCongestion (true) &&
+					(!checkIsReal || router->GetProfile ()->IsReal ()) &&
 					(!endpoint || (router->IsV4 () && (!reverse || router->IsPublished (true)))); // endpoint must be ipv4 and published if inbound(reverse)
 
 			});

libi2pd/NetDb.hpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2024, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -38,8 +38,10 @@ namespace data
 {
 	const int NETDB_MIN_ROUTERS = 90;
 	const int NETDB_MIN_FLOODFILLS = 5;
-	const int NETDB_NUM_FLOODFILLS_THRESHOLD = 1500;
+	const int NETDB_NUM_FLOODFILLS_THRESHOLD = 1000;
 	const int NETDB_NUM_ROUTERS_THRESHOLD = 4*NETDB_NUM_FLOODFILLS_THRESHOLD;
+	const int NETDB_TUNNEL_CREATION_RATE_THRESHOLD = 10; // in %
+	const int NETDB_CHECK_FOR_EXPIRATION_UPTIME = 600; // 10 minutes, in seconds  
 	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