- fix: auth logic part 2

Nebula.Launcher/Configurations/ComplexConVarBinder.cs

@@ -0,0 +1,86 @@
+using System;
+using System.ComponentModel;
+using System.Threading;
+using System.Threading.Tasks;
+using Nebula.Shared.Configurations;
+
+namespace Nebula.Launcher.Configurations;
+
+public abstract class ComplexConVarBinder<T> : INotifyPropertyChanged, INotifyPropertyChanging
+{
+    private readonly ConVarObserver<T> _baseConVar;
+    private readonly Lock _lock = new();
+    private readonly SemaphoreSlim _valueChangeSemaphore = new(1, 1);
+
+    public T? Value
+    {
+        get
+        {
+            lock (_lock)
+            {
+                return _baseConVar.Value;
+            }
+        }
+        set
+        {
+            _ = SetValueAsync(value);
+        }
+    }
+    
+    public bool HasValue
+    {
+        get
+        {
+            lock (_lock)
+            {
+                return _baseConVar.HasValue;
+            }
+        }
+    }
+
+    protected ComplexConVarBinder(ConVarObserver<T> baseConVar)
+    {
+        _baseConVar = baseConVar ?? throw new ArgumentNullException(nameof(baseConVar));
+        _baseConVar.PropertyChanged += BaseConVarOnPropertyChanged;
+        _baseConVar.PropertyChanging += BaseConVarOnPropertyChanging;
+    }
+    
+
+    private async Task SetValueAsync(T? value)
+    {
+        await _valueChangeSemaphore.WaitAsync().ConfigureAwait(false);
+
+        try
+        {
+            var newValue = await OnValueChange(value).ConfigureAwait(false);
+
+            lock (_lock)
+            {
+                _baseConVar.Value = newValue;
+            }
+        }
+        finally
+        {
+            _valueChangeSemaphore.Release();
+        }
+    }
+
+    protected abstract Task<T?> OnValueChange(T? newValue);
+
+    private void BaseConVarOnPropertyChanged(object? sender, PropertyChangedEventArgs e)
+    {
+        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(HasValue)));
+        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(Value)));
+    }
+    
+    private void BaseConVarOnPropertyChanging(object? sender, PropertyChangingEventArgs e)
+    {
+        PropertyChanging?.Invoke(this, new PropertyChangingEventArgs(nameof(HasValue)));
+        PropertyChanging?.Invoke(this, new PropertyChangingEventArgs(nameof(Value)));
+    }
+    
+
+    public event PropertyChangedEventHandler? PropertyChanged;
+
+    public event PropertyChangingEventHandler? PropertyChanging;
+}