[Peek]UserSettings load logging fix and refactor (#36111)

* UserSettings refactor to fix logging bug, properly initialise defaults etc.

* Apply lock only to code which changes shared data.

src/modules/peek/Peek.UI/Services/UserSettings.cs

@@ -3,10 +3,8 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
-using System.IO;
 using System.IO.Abstractions;
 using System.Threading;
-
 using ManagedCommon;
 using Microsoft.PowerToys.Settings.UI.Library;
 using Microsoft.PowerToys.Settings.UI.Library.Utilities;
@@ -16,71 +14,77 @@ namespace Peek.UI
     public class UserSettings : IUserSettings
     {
         private const string PeekModuleName = "Peek";
-        private const int MaxNumberOfRetry = 5;
+        private const int MaxAttempts = 4;
 
         private readonly SettingsUtils _settingsUtils;
-        private readonly IFileSystemWatcher _watcher;
-        private readonly Lock _loadingSettingsLock = new();
 
+        private readonly Lock _settingsLock = new();
+
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("CodeQuality", "IDE0052:Remove unread private members", Justification = "Defined in helper called in constructor.")]
+        private readonly IFileSystemWatcher _watcher;
+
+        /// <summary>
+        /// Gets a value indicating whether Peek closes automatically when the window loses focus.
+        /// </summary>
         public bool CloseAfterLosingFocus { get; private set; }
 
         public UserSettings()
         {
             _settingsUtils = new SettingsUtils();
-            CloseAfterLosingFocus = false;
 
             LoadSettingsFromJson();
 
-            _watcher = Helper.GetFileWatcher(PeekModuleName, "settings.json", () => LoadSettingsFromJson());
+            _watcher = Helper.GetFileWatcher(PeekModuleName, SettingsUtils.DefaultFileName, LoadSettingsFromJson);
+        }
+
+        private void ApplySettings(PeekSettings settings)
+        {
+            lock (_settingsLock)
+            {
+                CloseAfterLosingFocus = settings.Properties.CloseAfterLosingFocus.Value;
+            }
+        }
+
+        private void ApplyDefaultSettings()
+        {
+            ApplySettings(new PeekSettings());
         }
 
         private void LoadSettingsFromJson()
         {
-            lock (_loadingSettingsLock)
+            for (int attempt = 1; attempt <= MaxAttempts; attempt++)
             {
-                var retry = true;
-                var retryCount = 0;
-
-                while (retry)
+                try
                 {
-                    try
+                    ApplySettings(_settingsUtils.GetSettingsOrDefault<PeekSettings>(PeekModuleName));
+                    return;
+                }
+                catch (System.IO.IOException ex)
+                {
+                    Logger.LogError($"Peek settings load attempt {attempt} failed: {ex.Message}", ex);
+                    if (attempt == MaxAttempts)
                     {
-                        retryCount++;
-
-                        if (!_settingsUtils.SettingsExists(PeekModuleName))
-                        {
-                            Logger.LogInfo("Peek settings.json was missing, creating a new one");
-                            var defaultSettings = new PeekSettings();
-                            defaultSettings.Save(_settingsUtils);
-                        }
-
-                        var settings = _settingsUtils.GetSettingsOrDefault<PeekSettings>(PeekModuleName);
-                        if (settings != null)
-                        {
-                            CloseAfterLosingFocus = settings.Properties.CloseAfterLosingFocus.Value;
-                        }
-
-                        retry = false;
-                    }
-                    catch (IOException e)
-                    {
-                        if (retryCount > MaxNumberOfRetry)
-                        {
-                            retry = false;
-                            Logger.LogError($"Failed to Deserialize PowerToys settings, Retrying {e.Message}", e);
-                        }
-                        else
-                        {
-                            Thread.Sleep(500);
-                        }
-                    }
-                    catch (Exception ex)
-                    {
-                        retry = false;
-                        Logger.LogError("Failed to read changed settings", ex);
+                        Logger.LogError($"Failed to load Peek settings after {MaxAttempts} attempts. Continuing with default settings.");
+                        ApplyDefaultSettings();
+                        return;
                     }
+
+                    // Exponential back-off then retry.
+                    Thread.Sleep(CalculateRetryDelay(attempt));
+                }
+                catch (Exception ex)
+                {
+                    // Anything other than an IO exception is an immediate failure.
+                    Logger.LogError($"Peek settings load failed, continuing with defaults: {ex.Message}", ex);
+                    ApplyDefaultSettings();
+                    return;
                 }
             }
         }
+
+        private static int CalculateRetryDelay(int attempt)
+        {
+            return (int)Math.Pow(2, attempt) * 100;
+        }
     }
 }

src/settings-ui/Settings.UI.Library/SettingsUtils.cs

@@ -14,7 +14,7 @@ namespace Microsoft.PowerToys.Settings.UI.Library
 {
     public class SettingsUtils : ISettingsUtils
     {
-        private const string DefaultFileName = "settings.json";
+        public const string DefaultFileName = "settings.json";
         private const string DefaultModuleName = "";
         private readonly IFile _file;
         private readonly ISettingsPath _settingsPath;