TESTERS WANTED: RyuLDN implementation (#65)

These changes allow players to matchmake for local wireless using a LDN
server. The network implementation originates from Berry's public TCP
RyuLDN fork. Logo and unrelated changes have been removed.

Additionally displays LDN game status in the game selection window when
RyuLDN is enabled.

Functionality is only enabled while network mode is set to "RyuLDN" in
the settings.

src/Ryujinx.UI.Common/App/ApplicationData.cs

@@ -27,6 +27,8 @@ namespace Ryujinx.UI.App.Common
         public ulong Id { get; set; }
         public string Developer { get; set; } = "Unknown";
         public string Version { get; set; } = "0";
+        public int PlayerCount { get; set; }
+        public int GameCount { get; set; }
         public TimeSpan TimePlayed { get; set; }
         public DateTime? LastPlayed { get; set; }
         public string FileExtension { get; set; }

src/Ryujinx.UI.Common/App/ApplicationLibrary.cs

@@ -12,6 +12,7 @@ using LibHac.Tools.Fs;
 using LibHac.Tools.FsSystem;
 using LibHac.Tools.FsSystem.NcaUtils;
 using Ryujinx.Common.Configuration;
+using Ryujinx.Common.Configuration.Multiplayer;
 using Ryujinx.Common.Logging;
 using Ryujinx.Common.Utilities;
 using Ryujinx.HLE.FileSystem;
@@ -27,10 +28,12 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Net.Http;
 using System.Reflection;
 using System.Text;
 using System.Text.Json;
 using System.Threading;
+using System.Threading.Tasks;
 using ContentType = LibHac.Ncm.ContentType;
 using MissingKeyException = LibHac.Common.Keys.MissingKeyException;
 using Path = System.IO.Path;
@@ -41,8 +44,10 @@ namespace Ryujinx.UI.App.Common
 {
     public class ApplicationLibrary
     {
+        public static string DefaultLanPlayWebHost = "ryuldnweb.vudjun.com";
         public Language DesiredLanguage { get; set; }
         public event EventHandler<ApplicationCountUpdatedEventArgs> ApplicationCountUpdated;
+        public event EventHandler<LdnGameDataReceivedEventArgs> LdnGameDataReceived;
 
         public readonly IObservableCache<ApplicationData, ulong> Applications;
         public readonly IObservableCache<(TitleUpdateModel TitleUpdate, bool IsSelected), TitleUpdateModel> TitleUpdates;
@@ -62,6 +67,7 @@ namespace Ryujinx.UI.App.Common
         private readonly SourceCache<(DownloadableContentModel Dlc, bool IsEnabled), DownloadableContentModel> _downloadableContents = new(it => it.Dlc);
 
         private static readonly ApplicationJsonSerializerContext _serializerContext = new(JsonHelper.GetDefaultSerializerOptions());
+        private static readonly LdnGameDataSerializerContext _ldnDataSerializerContext = new(JsonHelper.GetDefaultSerializerOptions());
 
         public ApplicationLibrary(VirtualFileSystem virtualFileSystem, IntegrityCheckLevel checkLevel)
         {
@@ -687,7 +693,7 @@ namespace Ryujinx.UI.App.Common
                                 (Path.GetExtension(file).ToLower() is ".pfs0" && ConfigurationState.Instance.UI.ShownFileTypes.PFS0) ||
                                 (Path.GetExtension(file).ToLower() is ".xci" && ConfigurationState.Instance.UI.ShownFileTypes.XCI) ||
                                 (Path.GetExtension(file).ToLower() is ".nca" && ConfigurationState.Instance.UI.ShownFileTypes.NCA) ||
-                                (Path.GetExtension(file).ToLower() is ".nro" && ConfigurationState.Instance.UI.ShownFileTypes.NRO) || 
+                                (Path.GetExtension(file).ToLower() is ".nro" && ConfigurationState.Instance.UI.ShownFileTypes.NRO) ||
                                 (Path.GetExtension(file).ToLower() is ".nso" && ConfigurationState.Instance.UI.ShownFileTypes.NSO)
                             );
 
@@ -719,6 +725,7 @@ namespace Ryujinx.UI.App.Common
                     }
                 }
 
+
                 // Loops through applications list, creating a struct and then firing an event containing the struct for each application
                 foreach (string applicationPath in applicationPaths)
                 {
@@ -775,6 +782,46 @@ namespace Ryujinx.UI.App.Common
             }
         }
 
+        public async Task RefreshLdn()
+        {
+
+            if (ConfigurationState.Instance.Multiplayer.Mode == MultiplayerMode.LdnRyu)
+            {
+                try
+                {
+                    string ldnWebHost = ConfigurationState.Instance.Multiplayer.LdnServer;
+                    if (string.IsNullOrEmpty(ldnWebHost))
+                    {
+                        ldnWebHost = DefaultLanPlayWebHost;
+                    }
+                    IEnumerable<LdnGameData> ldnGameDataArray = Array.Empty<LdnGameData>();
+                    using HttpClient httpClient = new HttpClient();
+                    string ldnGameDataArrayString = await httpClient.GetStringAsync($"https://{ldnWebHost}/api/public_games");
+                    ldnGameDataArray = JsonHelper.Deserialize(ldnGameDataArrayString, _ldnDataSerializerContext.IEnumerableLdnGameData);
+                    var evt = new LdnGameDataReceivedEventArgs
+                    {
+                        LdnData = ldnGameDataArray
+                    };
+                    LdnGameDataReceived?.Invoke(null, evt);
+                }
+                catch (Exception ex)
+                {
+                    Logger.Warning?.Print(LogClass.Application, $"Failed to fetch the public games JSON from the API. Player and game count in the game list will be unavailable.\n{ex.Message}");
+                    LdnGameDataReceived?.Invoke(null, new LdnGameDataReceivedEventArgs()
+                    {
+                        LdnData = Array.Empty<LdnGameData>()
+                    });
+                }
+            }
+            else
+            {
+                LdnGameDataReceived?.Invoke(null, new LdnGameDataReceivedEventArgs()
+                {
+                    LdnData = Array.Empty<LdnGameData>()
+                });
+            }
+        }
+
         // Replace the currently stored DLC state for the game with the provided DLC state.
         public void SaveDownloadableContentsForGame(ApplicationData application, List<(DownloadableContentModel, bool IsEnabled)> dlcs)
         {

src/Ryujinx.UI.Common/App/LdnGameData.cs

@@ -0,0 +1,16 @@
+using System.Collections.Generic;
+
+namespace Ryujinx.UI.App.Common
+{
+    public struct LdnGameData
+    {
+        public string Id { get; set; }
+        public int PlayerCount { get; set; }
+        public int MaxPlayerCount { get; set; }
+        public string GameName { get; set; }
+        public string TitleId { get; set; }
+        public string Mode { get; set; }
+        public string Status { get; set; }
+        public IEnumerable<string> Players { get; set; }
+    }
+}

src/Ryujinx.UI.Common/App/LdnGameDataReceivedEventArgs.cs

@@ -0,0 +1,10 @@
+using System;
+using System.Collections.Generic;
+
+namespace Ryujinx.UI.App.Common
+{
+    public class LdnGameDataReceivedEventArgs : EventArgs
+    {
+        public IEnumerable<LdnGameData> LdnData { get; set; }
+    }
+}

src/Ryujinx.UI.Common/App/LdnGameDataSerializerContext.cs

@@ -0,0 +1,11 @@
+using System.Collections.Generic;
+using System.Text.Json.Serialization;
+
+namespace Ryujinx.UI.App.Common
+{
+    [JsonSerializable(typeof(IEnumerable<LdnGameData>))]
+    internal partial class LdnGameDataSerializerContext : JsonSerializerContext
+    {
+
+    }
+}