Optimize internal querying of UserData, other fixes (#14795)

Emby.Server.Implementations/Library/LibraryManager.cs

@@ -1090,6 +1090,7 @@ namespace Emby.Server.Implementations.Library
 
         public async Task ValidateTopLibraryFolders(CancellationToken cancellationToken, bool removeRoot = false)
         {
+            RootFolder.Children = null;
             await RootFolder.RefreshMetadata(cancellationToken).ConfigureAwait(false);
 
             // Start by just validating the children of the root, but go no further
@@ -1100,9 +1101,12 @@ namespace Emby.Server.Implementations.Library
                 allowRemoveRoot: removeRoot,
                 cancellationToken: cancellationToken).ConfigureAwait(false);
 
-            await GetUserRootFolder().RefreshMetadata(cancellationToken).ConfigureAwait(false);
+            var rootFolder = GetUserRootFolder();
+            rootFolder.Children = null;
 
-            await GetUserRootFolder().ValidateChildren(
+            await rootFolder.RefreshMetadata(cancellationToken).ConfigureAwait(false);
+
+            await rootFolder.ValidateChildren(
                 new Progress<double>(),
                 new MetadataRefreshOptions(new DirectoryService(_fileSystem)),
                 recursive: false,
@@ -1110,7 +1114,7 @@ namespace Emby.Server.Implementations.Library
                 cancellationToken: cancellationToken).ConfigureAwait(false);
 
             // Quickly scan CollectionFolders for changes
-            foreach (var child in GetUserRootFolder().Children.OfType<Folder>())
+            foreach (var child in rootFolder.Children!.OfType<Folder>())
             {
                 // If the user has somehow deleted the collection directory, remove the metadata from the database.
                 if (child is CollectionFolder collectionFolder && !Directory.Exists(collectionFolder.Path))

Emby.Server.Implementations/Library/MusicManager.cs

@@ -45,11 +45,14 @@ namespace Emby.Server.Implementations.Library
         public IReadOnlyList<BaseItem> GetInstantMixFromFolder(Folder item, User? user, DtoOptions dtoOptions)
         {
             var genres = item
-               .GetRecursiveChildren(user, new InternalItemsQuery(user)
-               {
-                   IncludeItemTypes = [BaseItemKind.Audio],
-                   DtoOptions = dtoOptions
-               })
+               .GetRecursiveChildren(
+                user,
+                new InternalItemsQuery(user)
+                {
+                    IncludeItemTypes = [BaseItemKind.Audio],
+                    DtoOptions = dtoOptions
+                },
+                out _)
                .Cast<Audio>()
                .SelectMany(i => i.Genres)
                .Concat(item.Genres)

Emby.Server.Implementations/Library/UserDataManager.cs

@@ -80,6 +80,7 @@ namespace Emby.Server.Implementations.Library
             var userId = user.InternalId;
             var cacheKey = GetCacheKey(userId, item.Id);
             _cache.AddOrUpdate(cacheKey, userData);
+            item.UserData = dbContext.UserData.Where(e => e.ItemId == item.Id).AsNoTracking().ToArray(); // rehydrate the cached userdata
 
             UserDataSaved?.Invoke(this, new UserDataSaveEventArgs
             {
@@ -159,7 +160,7 @@ namespace Emby.Server.Implementations.Library
             };
         }
 
-        private UserItemData Map(UserData dto)
+        private static UserItemData Map(UserData dto)
         {
             return new UserItemData()
             {
@@ -237,7 +238,10 @@ namespace Emby.Server.Implementations.Library
         /// <inheritdoc />
         public UserItemData? GetUserData(User user, BaseItem item)
         {
-            return GetUserData(user, item.Id, item.GetUserDataKeys());
+            return item.UserData.Where(e => e.UserId.Equals(user.Id)).Select(Map).FirstOrDefault() ?? new UserItemData()
+            {
+                Key = item.GetUserDataKeys()[0],
+            };
         }
 
         /// <inheritdoc />