NetworkTaskFactory

Млаумчерб.Клиент/Игра.cs

@@ -2,11 +2,13 @@
 using DTLib.Extensions;
 using Млаумчерб.Клиент.видимое;
 using Млаумчерб.Клиент.классы;
+using Млаумчерб.Клиент.сеть;
+using Млаумчерб.Клиент.сеть.NetworkTaskFactories;
 using static Млаумчерб.Клиент.классы.Пути;
 
 namespace Млаумчерб.Клиент;
 
-public class GameVersionDescriptor
+public class GameVersion
 {
     private readonly GameVersionProps _props;
     public string Name => _props.Name;
@@ -14,11 +16,11 @@ public class GameVersionDescriptor
 
     private IOPath JavaExecutableFilePath;
 
-    private MinecraftVersionDescriptor descriptor;
+    private VersionDescriptor descriptor;
     private JavaArguments javaArgs;
     private GameArguments gameArgs;
+    private Libraries libraries;
     private CancellationTokenSource? gameCts;
-    private CancellationTokenSource? downloadCts;
     private CommandTask<CommandResult>? commandTask;
 
     public static async Task<List<GameVersionProps>> GetAllVersionsAsync()
@@ -29,58 +31,76 @@ public class GameVersionDescriptor
             string name = GetVersionDescriptorName(f);
             propsList.Add(new GameVersionProps(name, null, f));
         }
+
         var remoteVersions = await Сеть.GetDownloadableVersions();
         propsList.AddRange(remoteVersions);
         return propsList;
     }
 
-    public static async Task<GameVersionDescriptor> CreateFromPropsAsync(GameVersionProps props)
+    public static async Task<GameVersion> CreateFromPropsAsync(GameVersionProps props)
     {
-        if(!File.Exists(props.LocalDescriptorPath))
+        if (!File.Exists(props.LocalDescriptorPath))
         {
             if (props.RemoteDescriptorUrl is null)
                 throw new NullReferenceException("can't download game version descriptor '"
-                     + props.Name + "', because RemoteDescriptorUrl is null");
+                                                 + props.Name + "', because RemoteDescriptorUrl is null");
             await Сеть.DownloadFileHTTP(props.RemoteDescriptorUrl, props.LocalDescriptorPath);
         }
-        return new GameVersionDescriptor(props);
+
+        return new GameVersion(props);
     }
 
-    private GameVersionDescriptor(GameVersionProps props)
+    private GameVersion(GameVersionProps props)
     {
         _props = props;
-        WorkingDirectory =  Path.Concat(Приложение.Настройки.путь_к_кубачу, Name);
         string descriptorText = File.ReadAllText(props.LocalDescriptorPath);
-        descriptor = JsonConvert.DeserializeObject<MinecraftVersionDescriptor>(descriptorText) 
-            ?? throw new Exception($"can't parse descriptor file '{props.LocalDescriptorPath}'");
+        descriptor = JsonConvert.DeserializeObject<VersionDescriptor>(descriptorText)
+                     ?? throw new Exception($"can't parse descriptor file '{props.LocalDescriptorPath}'");
         javaArgs = new JavaArguments(descriptor);
         gameArgs = new GameArguments(descriptor);
-        JavaExecutableFilePath = Path.Concat(Приложение.Настройки.путь_к_жабе, "bin",
-            OperatingSystem.IsWindows() ? "javaw.exe" : "javaw");
+        libraries = new Libraries(descriptor);
+        WorkingDirectory = GetVersionDir(descriptor.id);
+        JavaExecutableFilePath = GetJavaExecutablePath(descriptor.javaVersion.component);
     }
 
-    public async void BeginUpdate(bool force)
+    public async Task<List<NetworkTask>> CreateUpdateTasksAsync(bool checkHashes)
     {
-        try
+        List<INetworkTaskFactory> taskFactories =
+        [
+            new AssetsDownloadTaskFactory(descriptor),
+            new LibrariesDownloadTaskFactory(descriptor, libraries),
+            new VersionFileDownloadTaskFactory(descriptor),
+        ];
+        /*if(Приложение.Настройки.скачать_жабу)
+        {
+            taskFactories.Add(new JavaDownloadTaskFactory(descriptor));
+        }*/
+        /*if (modpack != null)
+        {
+            taskFactories.Add(new ModpackDownloadTaskFactory(modpack));
+        }*/
+        
+        List<NetworkTask> tasks = new();
+        for (int i = 0; i < taskFactories.Count; i++)
+        {
+            var nt = await taskFactories[i].CreateAsync(checkHashes);
+            if (nt != null) 
+                tasks.Add(nt);
+        }
+
+        if (tasks.Count == 0)
         {
-            downloadCts = new CancellationTokenSource();
-            if(Приложение.Настройки.скачать_жабу)
-                await Сеть.DownloadJava(descriptor.javaVersion, Приложение.Настройки.путь_к_жабе, force);
-            await Сеть.DownloadAssets(descriptor.assetIndex, downloadCts.Token, force);
-            await Сеть.DownloadVersionFile(descriptor.downloads.client.url, GetVersionJarFilePath(Name), force);
-            await Сеть.DownloadLibraries(descriptor.libraries, GetLibrariesDir(), force);
-            // await Network.DownloadModpack(modpack, WorkingDirectory, force);
             _props.IsDownloaded = true;
         }
-        catch (Exception ex)
+        else
         {
-            Ошибки.ПоказатьСообщение("GameUpdate", ex);
+            tasks[^1].OnStop += status =>
+            {
+                if (status == NetworkTask.Status.Completed)
+                    _props.IsDownloaded = true;
+            };
         }
-    }
-
-    public void CancelUpdate()
-    {
-        downloadCts?.Cancel();
+        return tasks;
     }
 
     public async Task Launch()
@@ -91,7 +111,7 @@ public class GameVersionDescriptor
             .WithWorkingDirectory(WorkingDirectory.ToString())
             .WithArguments(javaArgsList)
             .WithArguments(gameArgsList);
-        Приложение.Логгер.LogInfo(nameof(GameVersionDescriptor),
+        Приложение.Логгер.LogInfo(nameof(GameVersion),
             $"launching the game" +
             "\njava: " + command.TargetFilePath +
             "\nworking_dir: " + command.WorkingDirPath +
@@ -100,7 +120,7 @@ public class GameVersionDescriptor
         gameCts = new();
         commandTask = command.ExecuteAsync(gameCts.Token);
         var result = await commandTask;
-        Приложение.Логгер.LogInfo(nameof(GameVersionDescriptor), $"game exited with code {result.ExitCode}");
+        Приложение.Логгер.LogInfo(nameof(GameVersion), $"game exited with code {result.ExitCode}");
     }
 
     public void Close()

Млаумчерб.Клиент/Настройки.cs

@@ -1,4 +1,5 @@
-using Млаумчерб.Клиент.видимое;
+using DTLib.Extensions;
+using Млаумчерб.Клиент.видимое;
 
 namespace Млаумчерб.Клиент;
 
@@ -8,13 +9,14 @@ public record Настройки
     public int выделенная_память_мб { get; set; } = 4096;
     public bool открывать_на_весь_экран { get; set; }
     public string путь_к_кубачу { get; set; } = ".";
-    public string путь_к_жабе { get; set; } = "java";
     public bool скачать_жабу { get; set; } = true;
-    public string? последняя_запущенная_версия;
+    public string? последняя_запущенная_версия { get; set; }
+    
+    [JsonIgnore] private Stream? fileWriteStream; 
     
     public static Настройки ЗагрузитьИзФайла(string имя_файла = "млаумчерб.настройки")
     {
-        Приложение.Логгер.LogInfo(nameof(Настройки), $"попытка загрузить настройки из файла '{имя_файла}'");
+        Приложение.Логгер.LogInfo(nameof(Настройки), $"загружаются настройки из файла '{имя_файла}'");
         if(!File.Exists(имя_файла))
         {
             Приложение.Логгер.LogInfo(nameof(Настройки), "файл не существует");
@@ -26,11 +28,11 @@ public record Настройки
         if (н == null)
         {
             File.Move(имя_файла, имя_файла + ".старые", true);
-            н = new Настройки();
-            н.СохранитьВФайл();
             Ошибки.ПоказатьСообщение("Настройки", $"Не удалось прочитать настройки.\n" +
                      $"Сломанный файл настроек переименован в '{имя_файла}.старые'.\n" +
-                     $"Создан новый файл '{имя_файла}'.");
+                     $"Создаётся новый файл '{имя_файла}'.");
+            н = new Настройки();
+            н.СохранитьВФайл();
         }
 
         Приложение.Логгер.LogInfo(nameof(Настройки), $"настройки загружены: {н}");
@@ -39,9 +41,12 @@ public record Настройки
 
     public void СохранитьВФайл(string имя_файла = "млаумчерб.настройки")
     {
-        Приложение.Логгер.LogInfo(nameof(Настройки), $"попытка сохранить настройки в файл '{имя_файла}'");
+        //TODO: file backup and restore
+        Приложение.Логгер.LogDebug(nameof(Настройки), $"настройки сохраняются в файл '{имя_файла}'");
+        fileWriteStream ??= File.OpenWrite(имя_файла);
         var текст = JsonConvert.SerializeObject(this, Formatting.Indented);
-        File.WriteAllText(имя_файла, текст);
-        Приложение.Логгер.LogInfo(nameof(Настройки), $"настройки сохранены: {текст}");
+        fileWriteStream.Seek(0, SeekOrigin.Begin);
+        fileWriteStream.FluentWriteString(текст).Flush();
+        Приложение.Логгер.LogDebug(nameof(Настройки), $"настройки сохранены: {текст}");
     }
 }

Млаумчерб.Клиент/Сеть.cs

@@ -1,192 +0,0 @@
-using System.Buffers;
-using System.Net.Http;
-using Млаумчерб.Клиент.видимое;
-using Млаумчерб.Клиент.классы;
-using Timer = DTLib.Timer;
-
-namespace Млаумчерб.Клиент;
-
-public static class Сеть
-{
-    private static HttpClient http = new();
-    private const string ASSET_SERVER_URL = "https://resources.download.minecraft.net/";
-    private static readonly string[] VERSION_MANIFEST_URLS = {
-        "https://piston-meta.mojang.com/mc/game/version_manifest_v2.json"
-    };
-
-    public static async Task DownloadFileHTTP(string url, IOPath outPath,
-        Action<ArraySegment<byte>>? transformFunc = null, CancellationToken ct = default)
-    {
-        await using var src = await http.GetStreamAsync(url, ct);
-        await using var dst = File.OpenWrite(outPath);
-        
-        await src.CopyTransformAsync(dst, transformFunc, ct).ConfigureAwait(false);
-    }
-    
-    public static async Task CopyTransformAsync(this Stream src, Stream dst,
-        Action<ArraySegment<byte>>? transformFunc = null, CancellationToken ct = default)
-    {
-        // default dotnet runtime buffer size
-        int bufferSize = 81920;
-        byte[] readBuffer = ArrayPool<byte>.Shared.Rent(bufferSize);
-        byte[] writeBuffer = ArrayPool<byte>.Shared.Rent(bufferSize);
-        try
-        {
-            var readTask = src.ReadAsync(readBuffer, 0, bufferSize, ct).ConfigureAwait(false);
-            while (true)
-            {
-                int readCount = await readTask;
-                if (readCount == 0)
-                    break;
-                (readBuffer, writeBuffer) = (writeBuffer, readBuffer);
-                readTask = src.ReadAsync(readBuffer, 0, bufferSize, ct).ConfigureAwait(false);
-                transformFunc?.Invoke(new  ArraySegment<byte>(writeBuffer, 0, readCount));
-                dst.Write(writeBuffer, 0, readCount);
-            }
-        }
-        catch (OperationCanceledException)
-        { }
-        finally
-        {
-            ArrayPool<byte>.Shared.Return(readBuffer);
-            ArrayPool<byte>.Shared.Return(writeBuffer);
-        }
-    }
-    
-    public static async Task DownloadAssets(AssetIndexProperties assetIndexProperties, CancellationToken ct, bool force)
-    {
-        IOPath indexFilePath = Пути.GetAssetIndexFilePath(assetIndexProperties.id);
-        if (File.Exists(indexFilePath) && !force)
-            return;
-        
-        IOPath indexFilePathTmp = indexFilePath + ".tmp";
-        if(File.Exists(indexFilePathTmp))
-            File.Delete(indexFilePathTmp);
-        
-        // TODO: add something to Downloads ScrollList
-        Приложение.Логгер.LogInfo(nameof(DownloadAssets), $"started downloading asset index to '{indexFilePathTmp}'");
-        await DownloadFileHTTP(assetIndexProperties.url, indexFilePathTmp, null, ct);
-        Приложение.Логгер.LogInfo(nameof(DownloadAssets), "finished downloading asset index");
-        
-        string indexFileText = File.ReadAllText(indexFilePathTmp);
-        AssetIndex assetIndex = JsonConvert.DeserializeObject<AssetIndex>(indexFileText)
-            ?? throw new Exception($"can't deserialize asset index file '{indexFilePathTmp}'");
-
-        var assets = new List<KeyValuePair<string, AssetProperties>>();
-        HashSet<string> assetHashes = new HashSet<string>();
-        long totalSize = 0;
-        long currentSize = 0;
-        foreach (var pair in assetIndex.objects)
-        {
-            if (!assetHashes.Contains(pair.Value.hash))
-            {
-                assets.Add(pair);
-                assetHashes.Add(pair.Value.hash);
-                totalSize += pair.Value.size;
-            }
-        }
-
-        void AddBytesCountAtomic(ArraySegment<byte> chunk)
-        {
-            long chunkSize = chunk.Count;
-            Interlocked.Add(ref currentSize, chunkSize);
-        }
-
-        long prevSize = 0;
-        int timerDelay = 2000;
-        void ReportProgress()
-        {
-            // TODO: add something to Downloads ScrollList
-            long totalSizeM = totalSize/(1024*1024);
-            long currentSizeM = currentSize/(1024*1024);
-            long bytesPerSec = (currentSize - prevSize) / (timerDelay / 1000);
-            float KbytesPerSec = bytesPerSec / 1024f;
-            prevSize = currentSize;
-            Приложение.Логгер.LogDebug(nameof(DownloadAssets), 
-                $"download progress {currentSizeM}Mb/{totalSizeM}Mb ({KbytesPerSec}Kb/s)");
-        }
-        using Timer timer = new Timer(true, timerDelay, ReportProgress);
-        timer.Start();
-
-        Приложение.Логгер.LogInfo(nameof(DownloadAssets), "started downloading assets");
-        int parallelDownloads = 32;
-        var tasks = new Task[parallelDownloads];
-        var currentlyDownloadingFileHashes = new string[parallelDownloads];
-        int i = 0;
-        foreach (var a in assets)
-        {
-            string hash = a.Value.hash;
-            string hashStart = hash.Substring(0, 2);
-            var assetUrl = $"{ASSET_SERVER_URL}/{hashStart}/{hash}";
-            IOPath assetFilePath = Path.Concat("assets", "objects", hashStart, hash);
-            Приложение.Логгер.LogDebug(nameof(DownloadAssets), $"downloading asset '{a.Key}' {hash}");
-            tasks[i] = DownloadFileHTTP(assetUrl, assetFilePath, AddBytesCountAtomic, ct);
-            currentlyDownloadingFileHashes[i] = hash;
-            if (++i == parallelDownloads)
-            {
-                await Task.WhenAll(tasks);
-                i = 0;
-            }
-        }
-
-        await Task.WhenAll(tasks);
-        timer.Stop();
-        timer.InvokeAction();
-        File.Move(indexFilePathTmp, indexFilePath, true);
-        Приложение.Логгер.LogInfo(nameof(DownloadAssets), "finished downloading assets");
-    }
-
-    private static async Task<List<RemoteVersionDescriptorProps>> GetRemoteVersionDescriptorsAsync()
-    {
-        List<RemoteVersionDescriptorProps> descriptors = new();
-        foreach (var url in VERSION_MANIFEST_URLS)
-        {
-            try
-            {
-                var manifestText = await http.GetStringAsync(url);
-                var catalog = JsonConvert.DeserializeObject<VersionCatalog>(manifestText);
-                if (catalog != null)
-                    descriptors.AddRange(catalog.versions);
-            }
-            catch (Exception ex)
-            {
-                Приложение.Логгер.LogWarn(nameof(Сеть), ex);
-            }
-        }
-        return descriptors;
-    }
-
-    private static List<GameVersionProps>? _versionPropsList;
-    /// <returns>empty list if couldn't find any remote versions</returns>
-    public static async Task<IReadOnlyList<GameVersionProps>> GetDownloadableVersions()
-    {
-        if(_versionPropsList == null)
-        {
-            _versionPropsList = new();
-            var rvdlist = await GetRemoteVersionDescriptorsAsync();
-            foreach (var r in rvdlist)
-            {
-                if(r.type == "release")
-                    _versionPropsList.Add(new GameVersionProps(r.id, r.url));
-            }
-        }
-        return _versionPropsList;
-    }
-
-    public static async Task DownloadVersionFile(string url, IOPath filePath, bool force)
-    {
-        if(File.Exists(filePath) && !force)
-            return;
-        await DownloadFileHTTP(url, filePath);
-    }
-
-    public static async Task DownloadJava(JavaVersion javaVersion, IOPath path, bool force)
-    {
-        
-    }
-
-    public static async Task DownloadLibraries(List<Library> libraries, IOPath librariesDir, bool force)
-    {
-        
-    }
-}

Млаумчерб.Клиент/видимое/DownloadItemView.axaml

@@ -0,0 +1,20 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="Млаумчерб.Клиент.видимое.DownloadTaskView"
+             Padding="4" MaxHeight="60" MinWidth="200"
+             VerticalAlignment="Top"
+             HorizontalAlignment="Stretch"
+             BorderThickness="1" BorderBrush="#999999">
+    <Grid RowDefinitions="30 30" ColumnDefinitions="* 30">
+        <TextBlock Grid.Row="0" Grid.Column="0" Name="NameText"/>
+        <Button Grid.Row="0" Grid.Column="1"
+                Classes="button_no_border"
+                Background="Transparent"
+                Foreground="#FF4040"
+                FontSize="12"
+                Click="RemoveFromList">
+            [X]
+        </Button>
+        <TextBlock Grid.Row="1" Grid.Column="0" Name="DownloadedProgressText"/>
+    </Grid>
+</UserControl>

Млаумчерб.Клиент/видимое/DownloadItemView.axaml.cs

@@ -0,0 +1,42 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Threading;
+using Млаумчерб.Клиент.сеть;
+
+namespace Млаумчерб.Клиент.видимое;
+
+public partial class DownloadTaskView : UserControl
+{
+    private readonly NetworkTask _task;
+    private readonly Action<DownloadTaskView> _removeFromList;
+
+
+    public DownloadTaskView()
+    {
+        throw new NotImplementedException();
+    }
+    
+    public DownloadTaskView(NetworkTask task, Action<DownloadTaskView> removeFromList)
+    {
+        _task = task;
+        _removeFromList = removeFromList;
+        InitializeComponent();
+        NameText.Text = task.Name;
+        task.OnProgress += ReportProgress;
+    }
+
+    
+    void ReportProgress(DownloadProgress progress)
+    {
+        Dispatcher.UIThread.Invoke(() =>
+        {
+            DownloadedProgressText.Text = progress.ToString();
+        });
+    }
+
+    private void RemoveFromList(object? sender, RoutedEventArgs e)
+    {
+        _task.Cancel();
+        Dispatcher.UIThread.Invoke(() => _removeFromList.Invoke(this));
+    }
+}

Млаумчерб.Клиент/видимое/VersionItemView.axaml.cs

@@ -20,7 +20,7 @@ public partial class VersionItemView : ListBoxItem
         Props = props;
         InitializeComponent();
         text.Text = props.Name;
-        props.DownloadCompleted += UpdateBackground;
+        props.OnDownloadCompleted += UpdateBackground;
         UpdateBackground();
     }
 

Млаумчерб.Клиент/видимое/Окне.axaml

@@ -33,8 +33,9 @@
                             VerticalScrollBarVisibility="Visible"
                             Background="Transparent">
                         <TextBox Name="LogTextBox" 
-                                 FontSize="12"
+                                 FontSize="14"
                                  IsReadOnly="True" TextWrapping="Wrap"
+                                 VerticalAlignment="Top"
                                  Background="Transparent" BorderThickness="0"/>
                     </ScrollViewer>
                 </Grid>
@@ -92,10 +93,13 @@
                             Загрузки
                         </TextBlock>
                     </Border>
-                    <ScrollViewer Name="DownloadsScrollViewer" Grid.Row="1" 
+                    <ScrollViewer Grid.Row="1" 
                                   HorizontalScrollBarVisibility="Disabled"
                                   VerticalScrollBarVisibility="Visible"
-                                  Background="Transparent"/>
+                                  Background="Transparent" 
+                                  Padding="1">
+                        <StackPanel Name="DownloadsPanel" VerticalAlignment="Top"/>    
+                    </ScrollViewer>
                 </Grid>
             </Border>
         </Grid>

Млаумчерб.Клиент/видимое/Окне.axaml.cs

@@ -1,11 +1,9 @@
 using Avalonia;
 using Avalonia.Controls;
-using Avalonia.Controls.Presenters;
 using Avalonia.Data;
 using Avalonia.Interactivity;
 using Avalonia.Platform.Storage;
 using Avalonia.Threading;
-using Avalonia.VisualTree;
 using Млаумчерб.Клиент.классы;
 
 namespace Млаумчерб.Клиент.видимое;
@@ -59,19 +57,25 @@ public partial class Окне : Window
         {
             Приложение.Логгер.OnLogMessage += (context, severity, message, format) =>
             {
+                if(severity == LogSeverity.Debug)
+                    return;
+                
                 StringBuilder b = new();
                 b.Append(DateTime.Now.ToString("[HH:mm:ss]["));
                 b.Append(severity);
                 b.Append("]: ");
                 b.Append(message);
                 b.Append('\n');
-                double offsetFromBottom = LogScrollViewer.Extent.Height 
-                                          - LogScrollViewer.Offset.Y 
-                                          - LogScrollViewer.Viewport.Height;
-                bool is_scrolled_to_end = offsetFromBottom < 20.0; // scrolled less then one line up 
-                LogTextBox.Text += b.ToString();
-                if(is_scrolled_to_end)
-                    LogScrollViewer.ScrollToEnd();
+                Dispatcher.UIThread.Invoke(() =>
+                {
+                    double offsetFromBottom = LogScrollViewer.Extent.Height
+                                              - LogScrollViewer.Offset.Y
+                                              - LogScrollViewer.Viewport.Height;
+                    bool is_scrolled_to_end = offsetFromBottom < 20.0; // scrolled less then one line up 
+                    LogTextBox.Text += b.ToString();
+                    if (is_scrolled_to_end)
+                        LogScrollViewer.ScrollToEnd();
+                });
             };
             
             Username = Приложение.Настройки.имя_пользователя;
@@ -81,7 +85,7 @@ public partial class Окне : Window
             Directory.Create(Пути.GetVersionDescriptorDir());
             VersionComboBox.SelectedIndex = 0;
             VersionComboBox.IsEnabled = false;
-            var versions = await GameVersionDescriptor.GetAllVersionsAsync();
+            var versions = await GameVersion.GetAllVersionsAsync();
             Dispatcher.UIThread.Invoke(() =>
             {
                 foreach (var p in versions)
@@ -114,8 +118,18 @@ public partial class Окне : Window
             if (selectedVersion == null) 
                 return;
             
-            var v = await GameVersionDescriptor.CreateFromPropsAsync(selectedVersion);
-            v.BeginUpdate(CheckGameFiles);
+            var v = await GameVersion.CreateFromPropsAsync(selectedVersion);
+            var updateTasks = await v.CreateUpdateTasksAsync(CheckGameFiles);
+            foreach (var t in updateTasks)
+            {
+                var updateTask = t.StartAsync();
+                Dispatcher.UIThread.Invoke(() =>
+                {
+                    var view = new DownloadTaskView(t, view => DownloadsPanel.Children.Remove(view));
+                    DownloadsPanel.Children.Add(view);
+                });
+                await updateTask;
+            }
             Dispatcher.UIThread.Invoke(() => CheckGameFiles = false);
         }
         catch (Exception ex)

Млаумчерб.Клиент/классы/GameArguments.cs

@@ -9,7 +9,7 @@ public class GameArguments : ArgumentsWithPlaceholders
         "has_custom_resolution"
     ];
     
-    public GameArguments(MinecraftVersionDescriptor d)
+    public GameArguments(VersionDescriptor d)
     {
         if (d.minecraftArguments is not null)
         {

Млаумчерб.Клиент/классы/GameVersionProps.cs

@@ -11,11 +11,13 @@ public class GameVersionProps
         get => _isDownloaded;
         set
         {
+            bool downloadCompleted = value && !_isDownloaded;
             _isDownloaded = value;
-            DownloadCompleted?.Invoke();
+            if(downloadCompleted)
+                OnDownloadCompleted?.Invoke();
         }
     }
-    public event Action? DownloadCompleted;
+    public event Action? OnDownloadCompleted;
 
     public GameVersionProps(string name, string? url, IOPath descriptorPath)
     {

Млаумчерб.Клиент/классы/JavaArguments.cs

@@ -12,7 +12,7 @@ public class JavaArguments : ArgumentsWithPlaceholders
         
     ];
 
-    public JavaArguments(MinecraftVersionDescriptor d)
+    public JavaArguments(VersionDescriptor d)
     {
         raw_args.AddRange(_initial_arguments);
         if (d.arguments is not null)

Млаумчерб.Клиент/классы/Libraries.cs

@@ -0,0 +1,67 @@
+using DTLib.Extensions;
+
+namespace Млаумчерб.Клиент.классы;
+
+public class Libraries
+{
+    private static readonly string[] enabled_features = [];
+    
+    public record JarLib(string name, IOPath jarFilePath, Artifact artifact);
+    public record NativeLib(string name, IOPath jarFilePath, Artifact artifact, IOPath nativeFilesDir, Extract? extractionOptions) 
+        : JarLib(name, jarFilePath, artifact);
+    
+    public IReadOnlyCollection<JarLib> Libs { get; }
+    
+    public Libraries(VersionDescriptor descriptor)
+    {
+        List<JarLib> libs = new();
+        HashSet<string> libHashes = new();
+        
+        foreach (var l in descriptor.libraries)
+        {
+            if (l.rules != null && !Буржуазия.CheckRules(l.rules, enabled_features))
+                continue;
+
+            if (l.natives != null)
+            {
+                string? nativesKey;
+                if (OperatingSystem.IsWindows())
+                    nativesKey = l.natives.windows;
+                else if (OperatingSystem.IsLinux())
+                    nativesKey = l.natives.linux;
+                else if (OperatingSystem.IsMacOS())
+                    nativesKey = l.natives.osx;
+                else throw new PlatformNotSupportedException();
+                if(nativesKey is null)
+                    throw new Exception($"nativesKey for '{l.name}' is null");
+                
+                Artifact artifact = null!;
+                if(l.downloads.classifiers != null && !l.downloads.classifiers.TryGetValue(nativesKey, out artifact!))
+                    throw new Exception($"can't find artifact for '{l.name}' with nativesKey '{nativesKey}'");
+                
+                // skipping duplicates (WHO THE HELL CREATES THIS DISCRIPTORS AAAAAAAAA)
+                if(!libHashes.Add(artifact.sha1))
+                    continue;
+
+                IOPath dir = Пути.GetVersionDir(descriptor.id);
+                IOPath jarPath = Path.Concat(dir, Path.ReplaceRestrictedChars(l.name));
+                libs.Add(new NativeLib(l.name, jarPath, artifact, dir, l.extract));
+            }
+            else
+            {
+                Artifact? artifact = l.downloads.artifact;
+                if (artifact == null)
+                    throw new NullReferenceException($"artifact for '{l.name}' is null");
+                
+                // skipping duplicates
+                if(!libHashes.Add(artifact.sha1))
+                    continue;
+                
+                IOPath path = artifact.url.AsSpan().After("://").After('/').ToString();
+                libs.Add(new JarLib(l.name, Path.Concat(Пути.GetLibrariesDir(), path), artifact));
+            }
+        }
+
+        Libs = libs;
+    }
+}

Млаумчерб.Клиент/классы/VersionDescriptor.cs

@@ -3,7 +3,7 @@
 
 namespace Млаумчерб.Клиент.классы;
 
-public class MinecraftVersionDescriptor
+public class VersionDescriptor
 {
     [JsonRequired] public string id { get; set; } = "";
     [JsonRequired] public DateTime time { get; set; }
@@ -39,22 +39,10 @@ public class Rule
     public Dictionary<string, bool>? features { get; set; }
 }
 
-public class Classifiers
-{
-    [JsonProperty("natives-linux")]
-    public Artifact? nativeslinux { get; set; }
-    
-    [JsonProperty("natives-osx")]
-    public Artifact? nativesosx { get; set; }
-    
-    [JsonProperty("natives-windows")]
-    public Artifact? nativeswindows { get; set; }
-}
-
 public class LibraryDownloads
 {
     public Artifact? artifact { get; set; }
-    public Classifiers? classifiers { get; set; }
+    public Dictionary<string, Artifact>? classifiers { get; set; }
 }
 
 public class Extract

Млаумчерб.Клиент/классы/Буржуазия.cs

@@ -9,7 +9,7 @@ public static class Буржуазия
         os.name switch
         {
             null => true,
-            "osx" => OperatingSystem.IsWindows(),
+            "osx" => OperatingSystem.IsMacOS(),
             "linux" => OperatingSystem.IsLinux(),
             "windows" => OperatingSystem.IsWindows(),
             _ => throw new ArgumentOutOfRangeException(os.name)

Млаумчерб.Клиент/классы/Пути.cs

@@ -16,12 +16,23 @@ public static class Пути
     public static IOPath GetVersionDescriptorPath(string name) => 
         Path.Concat(GetVersionDescriptorDir(), Path.ReplaceRestrictedChars(name) + ".json");
     
-    public static IOPath GetVersionDir() => 
-        Path.Concat(Приложение.Настройки.путь_к_кубачу, "versions");
+    public static IOPath GetVersionDir(string id) => 
+        Path.Concat(Приложение.Настройки.путь_к_кубачу, "versions", id);
 
-    public static IOPath GetVersionJarFilePath(string name) =>
-        Path.Concat(GetVersionDir(), name + ".jar");
+    public static IOPath GetVersionJarFilePath(string id) =>
+        Path.Concat(GetVersionDir(id), id + ".jar");
     
     public static IOPath GetLibrariesDir() => 
         Path.Concat(Приложение.Настройки.путь_к_кубачу, "libraries");
+
+    public static IOPath GetJavaRuntimesDir() => 
+        Path.Concat(Приложение.Настройки.путь_к_кубачу, "java");
+    
+    
+    public static IOPath GetJavaRuntimeDir(string id) => 
+        Path.Concat(GetJavaRuntimesDir(), id);
+
+    public static IOPath GetJavaExecutablePath(string id) =>
+        Path.Concat(GetJavaRuntimeDir(id), "bin",
+            OperatingSystem.IsWindows() ? "javaw.exe" : "javaw");
 }

Млаумчерб.Клиент/сеть/DataSize.cs

@@ -0,0 +1,23 @@
+namespace Млаумчерб.Клиент.сеть;
+
+public record struct DataSize(long Bytes)
+{
+    static string BytesToHumanReadable(long bytes)
+    {
+        long K = bytes / 1024;
+        if (K == 0)
+            return $"{bytes}b";
+        float M = K / 1024f;
+        if (M < 1)
+            return $"{K:N1}Kb";
+        float G = M / 1024f;
+        if (G < 1)
+            return $"{M:N1}Mb";
+        return $"{G:N1}Gb";
+    }
+
+    public override string ToString() => BytesToHumanReadable(Bytes);
+    
+    public static implicit operator DataSize(long bytes) => new DataSize(bytes);
+}
+

Млаумчерб.Клиент/сеть/NetworkProgressReporter.cs

@@ -0,0 +1,62 @@
+using Млаумчерб.Клиент.видимое;
+using Timer = DTLib.Timer;
+
+namespace Млаумчерб.Клиент.сеть;
+
+public record struct DownloadProgress(DataSize Downloaded, DataSize Total, DataSize PerSecond)
+{
+    public override string ToString()
+    {
+        return $"{Downloaded}/{Total} ({PerSecond}/s)";
+    }
+}
+
+public class NetworkProgressReporter : IDisposable
+{
+    private readonly Action<DownloadProgress> _reportProgressDelegate;
+    private long _totalSize;
+    private long _curSize;
+    private long _prevSize;
+    private int _timerDelay = 1000;
+    private Timer _timer;
+    
+    public NetworkProgressReporter(long totalSize, Action<DownloadProgress> reportProgressDelegate)
+    {
+        _totalSize = totalSize;
+        _reportProgressDelegate = reportProgressDelegate;
+        _timer = new Timer(true, _timerDelay, ReportProgress);
+    }
+
+    // atomic add
+    public void AddBytesCount(ArraySegment<byte> chunk)
+    {
+        long chunkSize = chunk.Count;
+        Interlocked.Add(ref _curSize, chunkSize);
+    }
+    
+    public void Start()
+    {
+        _timer.Start();
+    }
+
+    public void Stop()
+    {
+        _timer.Stop();
+        _timer.InvokeAction();
+    }
+
+    public void Dispose()
+    {
+        Stop();
+    }
+
+    void ReportProgress()
+    {
+        long bytesPerSec = (_curSize - _prevSize) / (_timerDelay / 1000);
+        _prevSize = _curSize;
+        var p = new DownloadProgress(_curSize, _totalSize, bytesPerSec);
+        Приложение.Логгер.LogDebug(nameof(ReportProgress),
+            $"download progress {p}");
+        _reportProgressDelegate(p);
+    }
+}

Млаумчерб.Клиент/сеть/NetworkTask.cs

@@ -0,0 +1,71 @@
+namespace Млаумчерб.Клиент.сеть;
+
+public class NetworkTask : IDisposable
+{
+    public readonly string Name;
+
+    public enum Status
+    {
+        Initialized,
+        Running,
+        Completed,
+        Cancelled,
+        Failed
+    };
+
+    public Status DownloadStatus { get; private set; } = Status.Initialized;
+
+    public event Action<DownloadProgress>? OnProgress;
+    public event Action<Status>? OnStop; 
+
+    public delegate Task DownloadAction(NetworkProgressReporter progressReporter, CancellationToken ct);
+
+    private readonly DownloadAction _downloadAction;
+    private CancellationTokenSource _cts = new();
+    private NetworkProgressReporter _progressReporter;
+
+    public NetworkTask(string name, long dataSize, DownloadAction downloadAction)
+    {
+        Name = name;
+        _downloadAction = downloadAction;
+        _progressReporter = new NetworkProgressReporter(dataSize, ReportProgress);
+    }
+    
+    private void ReportProgress(DownloadProgress p) => OnProgress?.Invoke(p);
+
+    public async Task StartAsync()
+    {
+        if(DownloadStatus == Status.Running || DownloadStatus == Status.Completed)
+            return;
+        DownloadStatus = Status.Running;
+        try
+        {
+            _progressReporter.Start();
+            await _downloadAction(_progressReporter, _cts.Token);
+            DownloadStatus = Status.Completed;
+        }
+        catch
+        {
+            DownloadStatus = Status.Failed;
+            throw;
+        }
+        finally
+        {
+            _progressReporter.Stop();
+            OnStop?.Invoke(DownloadStatus);
+        }
+    } 
+
+    public void Cancel()
+    {
+        DownloadStatus = Status.Cancelled;
+        _cts.Cancel();
+        _cts = new CancellationTokenSource();
+    }
+
+    public void Dispose()
+    {
+        _cts.Dispose();
+        _progressReporter.Dispose();
+    }
+}

Млаумчерб.Клиент/сеть/NetworkTaskFactories/AssetsDownloadTaskFactory.cs

@@ -0,0 +1,112 @@
+using System.Security.Cryptography;
+using DTLib.Extensions;
+using Млаумчерб.Клиент.видимое;
+using Млаумчерб.Клиент.классы;
+using static Млаумчерб.Клиент.сеть.Сеть;
+
+namespace Млаумчерб.Клиент.сеть.NetworkTaskFactories;
+
+public class AssetsDownloadTaskFactory : INetworkTaskFactory
+{
+    private const string ASSET_SERVER_URL = "https://resources.download.minecraft.net/";
+    private VersionDescriptor _descriptor;
+    private SHA1 _hasher;
+    private IOPath _indexFilePath;
+    List<AssetDownloadProperties> _assetsToDownload = new();
+
+    public AssetsDownloadTaskFactory(VersionDescriptor descriptor)
+    {
+        _descriptor = descriptor;
+        _hasher = SHA1.Create();
+        _indexFilePath = Пути.GetAssetIndexFilePath(_descriptor.assetIndex.id);
+    }
+    
+    public async Task<NetworkTask?> CreateAsync(bool checkHashes)
+    {
+        if (!await CheckFilesAsync(checkHashes))
+            return new NetworkTask(
+                $"assets '{_descriptor.assetIndex.id}'",
+                GetTotalSize(),
+                Download
+            );
+        
+        return null;
+    }
+    private async Task<bool> CheckFilesAsync(bool checkHashes)
+    {
+        if(!File.Exists(_indexFilePath))
+        {
+            Приложение.Логгер.LogInfo(nameof(Сеть), $"started downloading asset index to '{_indexFilePath}'");
+            await DownloadFileHTTP(_descriptor.assetIndex.url, _indexFilePath);
+            Приложение.Логгер.LogInfo(nameof(Сеть), "finished downloading asset index");
+        }
+
+        string indexFileText = File.ReadAllText(_indexFilePath);
+        var assetIndex = JsonConvert.DeserializeObject<AssetIndex>(indexFileText) 
+                     ?? throw new Exception($"can't deserialize asset index file '{_indexFilePath}'");
+        
+        _assetsToDownload.Clear();
+        // removing duplicates for Dictionary (idk how can it be possible, but Newtonsoft.Json creates them)
+        HashSet<string> assetHashes = new HashSet<string>();
+        foreach (var pair in assetIndex.objects)
+        {
+            if (assetHashes.Add(pair.Value.hash))
+            {
+                var a = new AssetDownloadProperties(pair.Key, pair.Value);
+                if (!File.Exists(a.filePath))
+                {
+                    _assetsToDownload.Add(a);
+                }
+                else if(checkHashes)
+                {
+                    await using var fs = File.OpenRead(a.filePath);
+                    string hash = _hasher.ComputeHash(fs).HashToString();
+                    if (hash != a.hash)
+                        _assetsToDownload.Add(a);
+                }
+            }
+        }
+        
+        return _assetsToDownload.Count == 0;
+    }
+
+    private long GetTotalSize()
+    {
+        long totalSize = 0;
+        foreach (var a in _assetsToDownload) 
+            totalSize += a.size;
+        return totalSize;
+    }
+
+    private class AssetDownloadProperties
+    {
+        public string name;
+        public string hash;
+        public long size;
+        public string url;
+        public IOPath filePath;
+
+        public AssetDownloadProperties(string key, AssetProperties p)
+        {
+            name = key;
+            hash = p.hash;
+            size = p.size;
+            string hashStart = hash.Substring(0, 2);
+            url = $"{ASSET_SERVER_URL}/{hashStart}/{hash}";
+            filePath = Path.Concat(IOPath.ArrayCast(["assets", "objects", hashStart, hash], true));
+        }
+    }
+    
+    private async Task Download(NetworkProgressReporter pr, CancellationToken ct)
+    {
+        Приложение.Логгер.LogInfo(nameof(Сеть), "started downloading assets");
+        ParallelOptions opt = new() { MaxDegreeOfParallelism = ParallelDownloadsN, CancellationToken = ct };
+        await Parallel.ForEachAsync(_assetsToDownload, opt, 
+            async (a, _ct) =>
+            {
+                Приложение.Логгер.LogDebug(nameof(Сеть), $"downloading asset '{a.name}' {a.hash}");
+                await DownloadFileHTTP(a.url, a.filePath, _ct, pr.AddBytesCount);
+            });
+        Приложение.Логгер.LogInfo(nameof(Сеть), "finished downloading assets");
+    }
+}

Млаумчерб.Клиент/сеть/NetworkTaskFactories/INetworkTaskFactory.cs

@@ -0,0 +1,7 @@
+namespace Млаумчерб.Клиент.сеть.NetworkTaskFactories;
+
+public interface INetworkTaskFactory
+{
+    /// <returns>unstarted network task or null if there is nothing to download</returns>
+    Task<NetworkTask?> CreateAsync(bool checkHashes);
+}

Млаумчерб.Клиент/сеть/NetworkTaskFactories/JavaDownloadTaskFactory.cs

@@ -0,0 +1,46 @@
+using System.Security.Cryptography;
+using Млаумчерб.Клиент.классы;
+using static Млаумчерб.Клиент.сеть.Сеть;
+
+namespace Млаумчерб.Клиент.сеть.NetworkTaskFactories;
+
+public class JavaDownloadTaskFactory : INetworkTaskFactory
+{
+    private VersionDescriptor _descriptor;
+    private SHA1 _hasher;
+    IOPath _javaVersionDir;
+    
+    public JavaDownloadTaskFactory(VersionDescriptor descriptor)
+    {
+        _descriptor = descriptor;
+        _hasher = SHA1.Create();
+        _javaVersionDir = Пути.GetJavaRuntimeDir(_descriptor.javaVersion.component);
+    }
+
+    public Task<NetworkTask?> CreateAsync(bool checkHashes)
+    {
+        NetworkTask? networkTask = null;
+        if (!CheckFiles(checkHashes))
+            networkTask = new(
+                    $"java runtime '{_descriptor.javaVersion.component}'",
+                    GetTotalSize(),
+                    Download
+                );
+        return Task.FromResult(networkTask);
+    }
+
+    private bool CheckFiles(bool checkHashes)
+    {
+        throw new NotImplementedException();
+    }
+    
+    private long GetTotalSize()
+    {
+        throw new NotImplementedException();
+    }
+
+    private Task Download(NetworkProgressReporter pr, CancellationToken ct)
+    {
+        throw new NotImplementedException();
+    }
+}

Млаумчерб.Клиент/сеть/NetworkTaskFactories/LibrariesDownloadTaskFactory.cs

@@ -0,0 +1,78 @@
+using System.Security.Cryptography;
+using DTLib.Extensions;
+using Млаумчерб.Клиент.видимое;
+using Млаумчерб.Клиент.классы;
+using static Млаумчерб.Клиент.сеть.Сеть;
+
+namespace Млаумчерб.Клиент.сеть.NetworkTaskFactories;
+
+public class LibrariesDownloadTaskFactory : INetworkTaskFactory
+{
+    private VersionDescriptor _descriptor;
+    private Libraries _libraries;
+    private SHA1 _hasher;
+    private List<Libraries.JarLib> _libsToDownload = new();
+
+    public LibrariesDownloadTaskFactory(VersionDescriptor descriptor, Libraries libraries)
+    {
+        _descriptor = descriptor;
+        _libraries = libraries;
+        _hasher = SHA1.Create();
+    }
+    
+    public Task<NetworkTask?> CreateAsync(bool checkHashes)
+    {
+        NetworkTask? networkTask = null;
+        if (!CheckFiles(checkHashes))
+            networkTask = new NetworkTask(
+                $"libraries '{_descriptor.id}'",
+                GetTotalSize(),
+                Download
+            );
+        return Task.FromResult(networkTask);
+    }
+    
+    private bool CheckFiles(bool checkHashes)
+    {
+        _libsToDownload.Clear();
+        
+        foreach (var l in _libraries.Libs)
+        {
+            if (!File.Exists(l.jarFilePath))
+            {
+                _libsToDownload.Add(l);
+            }
+            else if (checkHashes)
+            {
+                using var fs = File.OpenRead(l.jarFilePath);
+                string hash = _hasher.ComputeHash(fs).HashToString();
+                if(hash != l.artifact.sha1)
+                    _libsToDownload.Add(l);
+            }
+        }
+
+        return _libsToDownload.Count == 0;
+    }
+    
+    private long GetTotalSize()
+    {
+        long total = 0;
+        foreach (var l in _libsToDownload)
+            total += l.artifact.size;
+        return total;
+    }
+
+    private async Task Download(NetworkProgressReporter pr, CancellationToken ct)
+    {
+        Приложение.Логгер.LogInfo(nameof(Сеть), "started downloading libraries");
+        ParallelOptions opt = new() { MaxDegreeOfParallelism = ParallelDownloadsN, CancellationToken = ct };
+        await Parallel.ForEachAsync(_libsToDownload, opt, async (l, _ct) =>
+        {
+            Приложение.Логгер.LogDebug(nameof(Сеть), 
+                $"downloading library '{l.name}' to '{l.jarFilePath}'");
+            await DownloadFileHTTP(l.artifact.url, l.jarFilePath, _ct, pr.AddBytesCount);
+            //TODO: extract natives from jar
+        });
+        Приложение.Логгер.LogInfo(nameof(Сеть), "finished downloading libraries");
+    }
+}

Млаумчерб.Клиент/сеть/NetworkTaskFactories/VersionFileDownloadTaskFactory.cs

@@ -0,0 +1,53 @@
+using System.Security.Cryptography;
+using DTLib.Extensions;
+using Млаумчерб.Клиент.классы;
+using static Млаумчерб.Клиент.сеть.Сеть;
+
+namespace Млаумчерб.Клиент.сеть.NetworkTaskFactories;
+
+public class VersionFileDownloadTaskFactory : INetworkTaskFactory
+{
+    private VersionDescriptor _descriptor;
+    private IOPath _filePath;
+    private SHA1 _hasher;
+    
+    public VersionFileDownloadTaskFactory(VersionDescriptor descriptor)
+    {
+        _descriptor = descriptor;
+        _filePath = Пути.GetVersionJarFilePath(_descriptor.id);
+        _hasher = SHA1.Create();
+    }
+
+    public Task<NetworkTask?> CreateAsync(bool checkHashes)
+    {
+        NetworkTask? networkTask = null;
+        if (!CheckFiles(checkHashes))
+            networkTask = new NetworkTask(
+                    $"version file '{_descriptor.id}'",
+                    GetTotalSize(),
+                    Download
+                );
+        return Task.FromResult(networkTask);
+    }
+
+    private bool CheckFiles(bool checkHashes)
+    {
+        if (!File.Exists(_filePath))
+            return false;
+        if (!checkHashes)
+            return true;
+        using var fs = File.OpenRead(_filePath);
+        string hash = _hasher.ComputeHash(fs).HashToString();
+        return hash == _descriptor.downloads.client.sha1;
+    }
+
+    private long GetTotalSize()
+    {
+        return _descriptor.downloads.client.size;
+    }
+    
+    private Task Download(NetworkProgressReporter pr, CancellationToken ct)
+    {
+        return DownloadFileHTTP(_descriptor.downloads.client.url, _filePath, ct, pr.AddBytesCount);
+    }
+}

Млаумчерб.Клиент/сеть/Сеть.cs

@@ -0,0 +1,97 @@
+using System.Buffers;
+using System.Net.Http;
+using Млаумчерб.Клиент.видимое;
+using Млаумчерб.Клиент.классы;
+
+namespace Млаумчерб.Клиент.сеть;
+
+public static class Сеть
+{
+    public static int ParallelDownloadsN = 32;
+    public static HttpClient http = new();
+
+    public static async Task DownloadFileHTTP(string url, IOPath outPath, CancellationToken ct = default,
+        Action<ArraySegment<byte>>? transformFunc = null)
+    {
+        await using var src = await http.GetStreamAsync(url, ct);
+        await using var dst = File.OpenWrite(outPath);
+
+        await src.CopyTransformAsync(dst, transformFunc, ct).ConfigureAwait(false);
+    }
+
+    public static async Task CopyTransformAsync(this Stream src, Stream dst,
+        Action<ArraySegment<byte>>? transformFunc = null, CancellationToken ct = default)
+    {
+        // default dotnet runtime buffer size
+        int bufferSize = 81920;
+        byte[] readBuffer = ArrayPool<byte>.Shared.Rent(bufferSize);
+        byte[] writeBuffer = ArrayPool<byte>.Shared.Rent(bufferSize);
+        try
+        {
+            var readTask = src.ReadAsync(readBuffer, 0, bufferSize, ct).ConfigureAwait(false);
+            while (true)
+            {
+                int readCount = await readTask;
+                if (readCount == 0)
+                    break;
+                (readBuffer, writeBuffer) = (writeBuffer, readBuffer);
+                readTask = src.ReadAsync(readBuffer, 0, bufferSize, ct).ConfigureAwait(false);
+                transformFunc?.Invoke(new ArraySegment<byte>(writeBuffer, 0, readCount));
+                dst.Write(writeBuffer, 0, readCount);
+            }
+        }
+        catch (OperationCanceledException)
+        {
+        }
+        finally
+        {
+            ArrayPool<byte>.Shared.Return(readBuffer);
+            ArrayPool<byte>.Shared.Return(writeBuffer);
+        }
+    }
+    
+    private static readonly string[] VERSION_MANIFEST_URLS =
+    {
+        "https://piston-meta.mojang.com/mc/game/version_manifest_v2.json"
+    };
+
+    private static async Task<List<RemoteVersionDescriptorProps>> GetRemoteVersionDescriptorsAsync()
+    {
+        List<RemoteVersionDescriptorProps> descriptors = new();
+        foreach (var url in VERSION_MANIFEST_URLS)
+        {
+            try
+            {
+                var manifestText = await http.GetStringAsync(url);
+                var catalog = JsonConvert.DeserializeObject<VersionCatalog>(manifestText);
+                if (catalog != null)
+                    descriptors.AddRange(catalog.versions);
+            }
+            catch (Exception ex)
+            {
+                Приложение.Логгер.LogWarn(nameof(Сеть), ex);
+            }
+        }
+
+        return descriptors;
+    }
+
+    private static List<GameVersionProps>? _versionPropsList;
+
+    /// <returns>empty list if couldn't find any remote versions</returns>
+    public static async Task<IReadOnlyList<GameVersionProps>> GetDownloadableVersions()
+    {
+        if (_versionPropsList == null)
+        {
+            _versionPropsList = new();
+            var rvdlist = await GetRemoteVersionDescriptorsAsync();
+            foreach (var r in rvdlist)
+            {
+                if (r.type == "release")
+                    _versionPropsList.Add(new GameVersionProps(r.id, r.url));
+            }
+        }
+
+        return _versionPropsList;
+    }
+}