[CHANGE] BackgroundServices

Manager.App/DependencyInjection.cs

@@ -26,8 +26,8 @@ public static class DependencyInjection
         });
 
         
-        builder.Services.AddSingleton<HostedServiceConnector>();
-        builder.Services.AddHostedService<ClientManager>();
+        builder.Services.AddSingleton<BackgroundServiceManager>();
+        builder.Services.AddHostedService<ClientService>();
         
         builder.Services.AddScoped<ILibraryService, LibraryService>();
     }

Manager.App/Services/CircularBuffer.cs

@@ -0,0 +1,56 @@
+using System.Threading.Channels;
+
+namespace Manager.App.Services;
+
+public class CircularBuffer <T>
+{
+    private readonly T[] _buffer;
+    private readonly Channel<T> _channel;
+
+    public int Capacity { get; }
+    public int Head { get; private set; }
+    public int Count { get; private set; }
+
+
+    public CircularBuffer(int capacity)
+    {
+        if (capacity <= 0)
+        {
+            throw new ArgumentOutOfRangeException(nameof(capacity));
+        }
+        
+        Capacity = capacity;
+        _buffer = new T[Capacity];
+        _channel = Channel.CreateUnbounded<T>(new UnboundedChannelOptions
+        {
+            SingleReader = false,
+            SingleWriter = false,
+        });
+    }
+
+    public void Add(T item)
+    {
+        _buffer[Head] = item;
+        Head = (Head + 1) % _buffer.Length;
+
+        if (Count < _buffer.Length)
+        {
+            Count++;
+        }
+        
+        _channel.Writer.TryWrite(item);
+    }
+
+    public IEnumerable<T> Items
+    {
+        get
+        {
+            for (var i = 0; i < Count; i++)
+            {
+                yield return _buffer[(Head - Count + i + _buffer.Length) % _buffer.Length];
+            }
+        }
+    }
+
+    public IAsyncEnumerable<T> GetStreamAsync() => _channel.Reader.ReadAllAsync();
+}

Manager.App/Services/ExtendedBackgroundService.cs

@@ -0,0 +1,97 @@
+using DotBased.Logging;
+using Manager.App.Services.System;
+using ILogger = Microsoft.Extensions.Logging.ILogger;
+
+namespace Manager.App.Services;
+
+public abstract class ExtendedBackgroundService : BackgroundService
+{
+    private readonly ManualResetEventSlim _resetEvent = new(true);
+    private readonly ILogger _logger;
+    public ServiceState State { get; private set; } = ServiceState.Stopped;
+    public CircularBuffer<ServiceProgress> ProgressLog { get; } = new(500);
+    public string Name { get; }
+    public TimeSpan ExecuteInterval { get; set; }
+
+    public ExtendedBackgroundService(string name, ILogger logger, BackgroundServiceManager manager, TimeSpan? executeInterval = null)
+    {
+        Name = name;
+        _logger = logger;
+        manager.RegisterService(this);
+        ExecuteInterval = executeInterval ?? TimeSpan.Zero;
+    }
+    
+    protected sealed override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        State = ServiceState.Running;
+        _logger.LogInformation("Starting background service: {ServiceName}", Name);
+        
+        try
+        {
+            while (!stoppingToken.IsCancellationRequested)
+            {
+                _resetEvent.Wait(stoppingToken);
+                await Task.Delay(ExecuteInterval, stoppingToken);
+                await ExecuteServiceAsync(stoppingToken);
+            }
+        }
+        catch (Exception e)
+        {
+            if (e is not OperationCanceledException)
+            {
+                State = ServiceState.Faulted;
+                _logger.LogError(e,"Background service {ServiceName} faulted!", Name);
+                throw;
+            }
+            _logger.LogInformation(e,"Service {ServiceName} received cancellation", Name);
+        }
+        finally
+        {
+            State = ServiceState.Stopped;
+        }
+    }
+
+    protected void LogProgress(string message, LogSeverity severity = LogSeverity.Info) => ProgressLog.Add(new ServiceProgress(message, DateTime.UtcNow, severity));
+
+    public void Pause()
+    {
+        if (State == ServiceState.Running)
+        {
+            _resetEvent.Reset();
+            State = ServiceState.Paused;
+            _logger.LogInformation("Pauses service: {ServiceName}", Name);
+        }
+    }
+
+    public void Resume()
+    {
+        if (State == ServiceState.Paused)
+        {
+            _resetEvent.Set();
+            State = ServiceState.Running;
+            _logger.LogInformation("Resumes service: {ServiceName}", Name);
+        }
+    }
+
+    protected abstract Task ExecuteServiceAsync(CancellationToken stoppingToken);
+
+    public override bool Equals(object? obj)
+    {
+        return obj is ExtendedBackgroundService bgService && bgService.Name.Equals(Name, StringComparison.OrdinalIgnoreCase);
+    }
+
+    public override int GetHashCode()
+    {
+        return Name.GetHashCode();
+    }
+}
+
+public enum ServiceState
+{
+    Stopped,
+    Faulted,
+    Running,
+    Paused
+}
+
+public record ServiceProgress(string Message, DateTime StartTime, LogSeverity Severity);

Manager.App/Services/System/BackgroundServiceManager.cs

@@ -0,0 +1,23 @@
+using Manager.App.Models.System;
+
+namespace Manager.App.Services.System;
+
+public class BackgroundServiceManager
+{
+    private readonly HashSet<ExtendedBackgroundService> _backgroundServices = [];
+
+    public void RegisterService(ExtendedBackgroundService service)
+    {
+        _backgroundServices.Add(service);
+    }
+
+    public ListResult<ExtendedBackgroundService> GetServices(string serviceName, int total = 20, int skip = 0)
+    {
+        var filtered = string.IsNullOrWhiteSpace(serviceName) ? _backgroundServices.ToArray() : _backgroundServices.Where(x => x.Name.Equals(serviceName, StringComparison.OrdinalIgnoreCase)).ToArray();
+
+        var results = filtered.OrderDescending()
+            .Skip(skip)
+            .Take(total);
+        return new ListResultReturn<ExtendedBackgroundService>(results.ToList(), filtered.Length);
+    }
+}

Manager.App/Services/System/ClientService.cs

@@ -6,19 +6,19 @@ using Manager.YouTube;
 
 namespace Manager.App.Services.System;
 
-public class ClientManager(IServiceScopeFactory scopeFactory, HostedServiceConnector serviceConnector) : BackgroundService
+public class ClientService(IServiceScopeFactory scopeFactory, ILogger<ClientService> logger, BackgroundServiceManager serviceManager) : ExtendedBackgroundService("ClientService", logger, serviceManager)
 {
     private readonly List<YouTubeClient> _clients = [];
     private CancellationToken _cancellationToken;
     private ILibraryService? _libraryService;
     
-    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    protected override async Task ExecuteServiceAsync(CancellationToken stoppingToken)
     {
-        serviceConnector.RegisterService(this);
         _cancellationToken = stoppingToken;
         stoppingToken.Register(CancellationRequested);
         using var scope = scopeFactory.CreateScope();
         _libraryService = scope.ServiceProvider.GetRequiredService<ILibraryService>();
+        LogProgress("Initializing service...");
     }
     
     private void CancellationRequested()

Manager.App/Services/System/HostedServiceConnector.cs

@@ -1,11 +0,0 @@
-namespace Manager.App.Services.System;
-
-public class HostedServiceConnector
-{
-    private readonly List<IHostedService> _hostedServices = [];
-
-    public void RegisterService(IHostedService service)
-    {
-        _hostedServices.Add(service);
-    }
-}

Manager.YouTube/YouTubeClient.cs

@@ -38,6 +38,12 @@ public sealed class YouTubeClient : IDisposable
         HttpClient = new HttpClient(GetHttpClientHandler());
     }
 
+    /// <summary>
+    /// Loads the given cookies and fetch client state.
+    /// </summary>
+    /// <param name="cookies">The cookies to use for making requests. Empty collection for anonymous requests.</param>
+    /// <param name="userAgent">The user agent to use for the requests. Only WEB client is supported.</param>
+    /// <returns></returns>
     public static async Task<Result<YouTubeClient>> CreateAsync(CookieCollection cookies, string userAgent)
     {
         var client = new YouTubeClient(cookies, userAgent);