select first hop from existing connections if applicable

Transports.cpp

@@ -489,6 +489,14 @@ namespace transport
 			m_PeerCleanupTimer.async_wait (std::bind (&Transports::HandlePeerCleanupTimer, this, std::placeholders::_1));
 		}	
 	}
+
+	std::shared_ptr<const i2p::data::RouterInfo> Transports::GetRandomPeer () const
+	{
+		CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
+		auto it = m_Peers.begin ();
+		std::advance (it, rnd.GenerateWord32 (0, m_Peers.size () - 1));	
+		return it != m_Peers.end () ? it->second.router : nullptr;
+	}
 }
 }
 

Transports.h

@@ -98,6 +98,8 @@ namespace transport
 			uint32_t GetInBandwidth () const { return m_InBandwidth; }; // bytes per second
 			uint32_t GetOutBandwidth () const { return m_OutBandwidth; }; // bytes per second
 			bool IsBandwidthExceeded () const;
+			size_t GetNumPeers () const { return m_Peers.size (); };
+			std::shared_ptr<const i2p::data::RouterInfo> GetRandomPeer () const;
 
 		private:
 

TunnelPool.cpp

@@ -4,6 +4,7 @@
 #include "NetDb.h"
 #include "Timestamp.h"
 #include "Garlic.h"
+#include "Transports.h"
 #include "TunnelPool.h"
 
 namespace i2p
@@ -341,10 +342,20 @@ namespace tunnel
 		if (inboundTunnel)
 		{	
 			LogPrint ("Creating destination outbound tunnel...");
-
+			int numHops = m_NumOutboundHops;
 			auto prevHop = i2p::context.GetSharedRouterInfo ();
 			std::vector<std::shared_ptr<const i2p::data::RouterInfo> > hops;
-			for (int i = 0; i < m_NumOutboundHops; i++)
+			if (i2p::transport::transports.GetNumPeers () > 25)
+			{
+				auto r = i2p::transport::transports.GetRandomPeer ();
+				if (r)
+				{
+					prevHop = r;
+					hops.push_back (r);
+					numHops--;
+				}
+			}
+			for (int i = 0; i < numHops; i++)
 			{
 				auto hop = SelectNextHop (prevHop);
 				if (!hop)