update to GeoIP2 and parse the database only once

closes #4227

OpenRA.Game/Game.cs

@@ -15,6 +15,7 @@ using System.IO;
 using System.Linq;
 using System.Net;
 using OpenRA.FileSystem;
+using MaxMind.GeoIP2;
 using OpenRA.GameRules;
 using OpenRA.Graphics;
 using OpenRA.Network;
@@ -42,6 +43,8 @@ namespace OpenRA
 		public static Renderer Renderer;
 		public static bool HasInputFocus = false;
 
+		public static DatabaseReader GeoIpDatabase;
+
 		public static void JoinServer(string host, int port, string password)
 		{
 			JoinInner(new OrderManager(host, port, password,
@@ -291,6 +294,7 @@ namespace OpenRA
 			Log.AddChannel("server", "server.log");
 			Log.AddChannel("sound", "sound.log");
 			Log.AddChannel("graphics", "graphics.log");
+			Log.AddChannel("geoip", "geoip.log");
 
 			if (Settings.Server.DiscoverNatDevices)
 				UPnP.TryNatDiscovery();
@@ -300,6 +304,15 @@ namespace OpenRA
 				Settings.Server.AllowPortForward = false;
 			}
 
+			try
+			{
+				GeoIpDatabase = new DatabaseReader("GeoLite2-Country.mmdb");
+			}
+			catch (Exception e)
+			{
+				Log.Write("geoip", "DatabaseReader failed: {0}", e);
+			}
+
 			GlobalFileSystem.Mount("."); // Needed to access shaders
 			var renderers = new[] { Settings.Graphics.Renderer, "Sdl2", "Gl", "Cg", null };
 			foreach (var r in renderers)