async server browser

OpenRA.Game/Server/MasterServerQuery.cs

@@ -4,20 +4,45 @@ using System.Linq;
 using System.Text;
 using System.Net;
 using OpenRA.FileFormats;
+using System.Threading;
 
 namespace OpenRA.Server
 {
 	static class MasterServerQuery
 	{
-		public static IEnumerable<GameServer> GetGameList(string masterServerUrl)
-		{
-			var wc = new WebClient();
-			var data = wc.DownloadData(masterServerUrl + "list.php");
-			var str = Encoding.UTF8.GetString(data);
+		public static event Action<GameServer[]> OnComplete = _ => { };
 
-			var yaml = MiniYaml.FromString(str);
-			return yaml.Select(a => { var gs = new GameServer(); FieldLoader.Load(gs, a.Value); return gs; })
-				.Where(gs => gs.Address != null);
+		static GameServer[] Games = { };
+		static AutoResetEvent ev = new AutoResetEvent(false);
+
+		public static void Refresh(string masterServerUrl)
+		{
+			new Thread(() =>
+			{
+				try
+				{
+					var wc = new WebClient();
+					var data = wc.DownloadData(new Uri(masterServerUrl + "list.php"));
+					var str = Encoding.UTF8.GetString(data);
+
+					var yaml = MiniYaml.FromString(str);
+
+					Games = yaml.Select(a => FieldLoader.Load<GameServer>(a.Value))
+						.Where(gs => gs.Address != null).ToArray();
+				}
+				catch
+				{
+					Games = null;
+				}
+
+				ev.Set();
+			}).Start();
+		}
+
+		public static void Tick()
+		{
+			if (ev.WaitOne(TimeSpan.FromMilliseconds(0))) 
+				OnComplete(Games);
 		}
 	}