Add initial hook-up to spectator backend

osu.Game.Tests/Visual/Gameplay/TestSceneSpectator.cs

@@ -232,7 +232,7 @@ namespace osu.Game.Tests.Visual.Gameplay
 
         public class TestSpectatorStreamingClient : SpectatorStreamingClient
         {
-            public readonly User StreamingUser = new User { Id = 1234, Username = "Test user" };
+            public readonly User StreamingUser = new User { Id = 55, Username = "Test user" };
 
             public new BindableList<int> PlayingUsers => (BindableList<int>)base.PlayingUsers;
 

osu.Game.Tests/Visual/Gameplay/TestSceneSpectatorDrivenLeaderboard.cs

@@ -0,0 +1,74 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using NUnit.Framework;
+using osu.Framework.Allocation;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Game.Database;
+using osu.Game.Online.API;
+using osu.Game.Online.Spectator;
+using osu.Game.Rulesets.Osu.Scoring;
+using osu.Game.Screens.Play.HUD;
+
+namespace osu.Game.Tests.Visual.Gameplay
+{
+    public class TestSceneSpectatorDrivenLeaderboard : OsuTestScene
+    {
+        [Cached(typeof(SpectatorStreamingClient))]
+        private TestSceneSpectator.TestSpectatorStreamingClient testSpectatorStreamingClient = new TestSceneSpectator.TestSpectatorStreamingClient();
+
+        // used just to show beatmap card for the time being.
+        protected override bool UseOnlineAPI => true;
+
+        [SetUp]
+        public void SetUp() => Schedule(() =>
+        {
+            OsuScoreProcessor scoreProcessor;
+
+            testSpectatorStreamingClient.StartPlay(55);
+
+            Children = new Drawable[]
+            {
+                scoreProcessor = new OsuScoreProcessor(),
+                new MultiplayerGameplayLeaderboard(scoreProcessor)
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                }
+            };
+        });
+    }
+
+    public class MultiplayerGameplayLeaderboard : GameplayLeaderboard
+    {
+        private readonly OsuScoreProcessor scoreProcessor;
+
+        public MultiplayerGameplayLeaderboard(OsuScoreProcessor scoreProcessor)
+        {
+            this.scoreProcessor = scoreProcessor;
+
+            AddPlayer(new BindableDouble(), new GuestUser());
+        }
+
+        [Resolved]
+        private SpectatorStreamingClient streamingClient { get; set; }
+
+        [Resolved]
+        private UserLookupCache userLookupCache { get; set; }
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            Console.WriteLine("got here");
+
+            foreach (var user in streamingClient.PlayingUsers)
+            {
+                streamingClient.WatchUser(user);
+                var resolvedUser = userLookupCache.GetUserAsync(user).Result;
+                AddPlayer(new BindableDouble(), resolvedUser);
+            }
+        }
+    }
+}