fix search index threading (#141)

* fix search index threading

* code cleanup

ErsatzTV.Application/ISearchBackgroundServiceRequest.cs

@@ -0,0 +1,6 @@
+namespace ErsatzTV.Application
+{
+    public interface ISearchBackgroundServiceRequest
+    {
+    }
+}

ErsatzTV.Application/MediaSources/Commands/ScanLocalLibraryHandler.cs

@@ -1,8 +1,11 @@
 using System;
+using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
 using System.Threading;
+using System.Threading.Channels;
 using System.Threading.Tasks;
+using ErsatzTV.Application.Search.Commands;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Locking;
@@ -26,6 +29,7 @@ namespace ErsatzTV.Application.MediaSources.Commands
         private readonly IMediator _mediator;
         private readonly IMovieFolderScanner _movieFolderScanner;
         private readonly IMusicVideoFolderScanner _musicVideoFolderScanner;
+        private readonly ChannelWriter<ISearchBackgroundServiceRequest> _searchChannel;
         private readonly ITelevisionFolderScanner _televisionFolderScanner;
 
         public ScanLocalLibraryHandler(
@@ -36,7 +40,8 @@ namespace ErsatzTV.Application.MediaSources.Commands
             IMusicVideoFolderScanner musicVideoFolderScanner,
             IEntityLocker entityLocker,
             IMediator mediator,
-            ILogger<ScanLocalLibraryHandler> logger)
+            ILogger<ScanLocalLibraryHandler> logger,
+            ChannelWriter<ISearchBackgroundServiceRequest> searchChannel)
         {
             _libraryRepository = libraryRepository;
             _configElementRepository = configElementRepository;
@@ -46,6 +51,7 @@ namespace ErsatzTV.Application.MediaSources.Commands
             _entityLocker = entityLocker;
             _mediator = mediator;
             _logger = logger;
+            _searchChannel = searchChannel;
         }
 
         public Task<Either<BaseError, string>> Handle(
@@ -87,7 +93,9 @@ namespace ErsatzTV.Application.MediaSources.Commands
                                 ffprobePath,
                                 lastScan,
                                 progressMin,
-                                progressMax);
+                                progressMax,
+                                AddToSearchIndex,
+                                RemoveFromSearchIndex);
                             break;
                         case LibraryMediaKind.Shows:
                             await _televisionFolderScanner.ScanFolder(
@@ -95,7 +103,9 @@ namespace ErsatzTV.Application.MediaSources.Commands
                                 ffprobePath,
                                 lastScan,
                                 progressMin,
-                                progressMax);
+                                progressMax,
+                                AddToSearchIndex,
+                                RemoveFromSearchIndex);
                             break;
                         case LibraryMediaKind.MusicVideos:
                             await _musicVideoFolderScanner.ScanFolder(
@@ -103,7 +113,9 @@ namespace ErsatzTV.Application.MediaSources.Commands
                                 ffprobePath,
                                 lastScan,
                                 progressMin,
-                                progressMax);
+                                progressMax,
+                                AddToSearchIndex,
+                                RemoveFromSearchIndex);
                             break;
                     }
 
@@ -126,6 +138,12 @@ namespace ErsatzTV.Application.MediaSources.Commands
             return Unit.Default;
         }
 
+        private ValueTask AddToSearchIndex(List<MediaItem> mediaItems) =>
+            _searchChannel.WriteAsync(new AddItemsToSearchIndex(mediaItems));
+
+        private ValueTask RemoveFromSearchIndex(List<int> mediaItemIds) =>
+            _searchChannel.WriteAsync(new RemoveItemsFromSearchIndex(mediaItemIds));
+
         private async Task<Validation<BaseError, RequestParameters>> Validate(IScanLocalLibrary request) =>
             (await LocalLibraryMustExist(request), await ValidateFFprobePath())
             .Apply(

ErsatzTV.Application/Plex/Commands/SynchronizePlexLibraryByIdHandler.cs

@@ -1,7 +1,10 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
+using System.Threading.Channels;
 using System.Threading.Tasks;
+using ErsatzTV.Application.Search.Commands;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Locking;
@@ -26,6 +29,7 @@ namespace ErsatzTV.Application.Plex.Commands
         private readonly IPlexMovieLibraryScanner _plexMovieLibraryScanner;
         private readonly IPlexSecretStore _plexSecretStore;
         private readonly IPlexTelevisionLibraryScanner _plexTelevisionLibraryScanner;
+        private readonly ChannelWriter<ISearchBackgroundServiceRequest> _searchChannel;
 
         public SynchronizePlexLibraryByIdHandler(
             IMediaSourceRepository mediaSourceRepository,
@@ -34,7 +38,8 @@ namespace ErsatzTV.Application.Plex.Commands
             IPlexTelevisionLibraryScanner plexTelevisionLibraryScanner,
             ILibraryRepository libraryRepository,
             IEntityLocker entityLocker,
-            ILogger<SynchronizePlexLibraryByIdHandler> logger)
+            ILogger<SynchronizePlexLibraryByIdHandler> logger,
+            ChannelWriter<ISearchBackgroundServiceRequest> searchChannel)
         {
             _mediaSourceRepository = mediaSourceRepository;
             _plexSecretStore = plexSecretStore;
@@ -43,6 +48,7 @@ namespace ErsatzTV.Application.Plex.Commands
             _libraryRepository = libraryRepository;
             _entityLocker = entityLocker;
             _logger = logger;
+            _searchChannel = searchChannel;
         }
 
         public Task<Either<BaseError, string>> Handle(
@@ -70,13 +76,17 @@ namespace ErsatzTV.Application.Plex.Commands
                         await _plexMovieLibraryScanner.ScanLibrary(
                             parameters.ConnectionParameters.ActiveConnection,
                             parameters.ConnectionParameters.PlexServerAuthToken,
-                            parameters.Library);
+                            parameters.Library,
+                            AddToSearchIndex,
+                            RemoveFromSearchIndex);
                         break;
                     case LibraryMediaKind.Shows:
                         await _plexTelevisionLibraryScanner.ScanLibrary(
                             parameters.ConnectionParameters.ActiveConnection,
                             parameters.ConnectionParameters.PlexServerAuthToken,
-                            parameters.Library);
+                            parameters.Library,
+                            AddToSearchIndex,
+                            RemoveFromSearchIndex);
                         break;
                 }
 
@@ -94,6 +104,12 @@ namespace ErsatzTV.Application.Plex.Commands
             return Unit.Default;
         }
 
+        private ValueTask AddToSearchIndex(List<MediaItem> mediaItems) =>
+            _searchChannel.WriteAsync(new AddItemsToSearchIndex(mediaItems));
+
+        private ValueTask RemoveFromSearchIndex(List<int> mediaItemIds) =>
+            _searchChannel.WriteAsync(new RemoveItemsFromSearchIndex(mediaItemIds));
+
         private async Task<Validation<BaseError, RequestParameters>> Validate(ISynchronizePlexLibraryById request) =>
             (await ValidateConnection(request), await PlexLibraryMustExist(request))
             .Apply(

ErsatzTV.Application/Search/Commands/AddItemsToSearchIndex.cs

@@ -0,0 +1,9 @@
+using System.Collections.Generic;
+using ErsatzTV.Core.Domain;
+using LanguageExt;
+
+namespace ErsatzTV.Application.Search.Commands
+{
+    public record AddItemsToSearchIndex(List<MediaItem> MediaItems) : MediatR.IRequest<Unit>,
+        ISearchBackgroundServiceRequest;
+}

ErsatzTV.Application/Search/Commands/AddItemsToSearchIndexHandler.cs

@@ -0,0 +1,17 @@
+using System.Threading;
+using System.Threading.Tasks;
+using ErsatzTV.Core.Interfaces.Search;
+using LanguageExt;
+
+namespace ErsatzTV.Application.Search.Commands
+{
+    public class AddItemsToSearchIndexHandler : MediatR.IRequestHandler<AddItemsToSearchIndex, Unit>
+    {
+        private readonly ISearchIndex _searchIndex;
+
+        public AddItemsToSearchIndexHandler(ISearchIndex searchIndex) => _searchIndex = searchIndex;
+
+        public Task<Unit> Handle(AddItemsToSearchIndex request, CancellationToken cancellationToken) =>
+            _searchIndex.AddItems(request.MediaItems);
+    }
+}

ErsatzTV.Application/Search/Commands/RebuildSearchIndex.cs

@@ -2,5 +2,5 @@
 
 namespace ErsatzTV.Application.Search.Commands
 {
-    public record RebuildSearchIndex : MediatR.IRequest<Unit>, IBackgroundServiceRequest;
+    public record RebuildSearchIndex : MediatR.IRequest<Unit>, ISearchBackgroundServiceRequest;
 }

ErsatzTV.Application/Search/Commands/RemoveItemsFromSearchIndex.cs

@@ -0,0 +1,8 @@
+using System.Collections.Generic;
+using LanguageExt;
+
+namespace ErsatzTV.Application.Search.Commands
+{
+    public record RemoveItemsFromSearchIndex(List<int> MediaItemIds) : MediatR.IRequest<Unit>,
+        ISearchBackgroundServiceRequest;
+}

ErsatzTV.Application/Search/Commands/RemoveItemsFromSearchIndexHandler.cs

@@ -0,0 +1,17 @@
+using System.Threading;
+using System.Threading.Tasks;
+using ErsatzTV.Core.Interfaces.Search;
+using LanguageExt;
+
+namespace ErsatzTV.Application.Search.Commands
+{
+    public class RemoveItemsFromSearchIndexHandler : MediatR.IRequestHandler<RemoveItemsFromSearchIndex, Unit>
+    {
+        private readonly ISearchIndex _searchIndex;
+
+        public RemoveItemsFromSearchIndexHandler(ISearchIndex searchIndex) => _searchIndex = searchIndex;
+
+        public Task<Unit> Handle(RemoveItemsFromSearchIndex request, CancellationToken cancellationToken) =>
+            _searchIndex.RemoveItems(request.MediaItemIds);
+    }
+}

ErsatzTV.Core.Tests/Metadata/MovieFolderScannerTests.cs

@@ -9,7 +9,6 @@ using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Interfaces.Images;
 using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
-using ErsatzTV.Core.Interfaces.Search;
 using ErsatzTV.Core.Metadata;
 using ErsatzTV.Core.Tests.Fakes;
 using FluentAssertions;
@@ -88,7 +87,9 @@ namespace ErsatzTV.Core.Tests.Metadata
                     FFprobePath,
                     DateTimeOffset.MinValue,
                     0,
-                    1);
+                    1,
+                    _ => ValueTask.CompletedTask,
+                    _ => ValueTask.CompletedTask);
 
                 result.IsLeft.Should().BeTrue();
                 result.IfLeft(error => error.Should().BeOfType<MediaSourceInaccessible>());
@@ -113,7 +114,9 @@ namespace ErsatzTV.Core.Tests.Metadata
                     FFprobePath,
                     DateTimeOffset.MinValue,
                     0,
-                    1);
+                    1,
+                    _ => ValueTask.CompletedTask,
+                    _ => ValueTask.CompletedTask);
 
                 result.IsRight.Should().BeTrue();
 
@@ -154,7 +157,10 @@ namespace ErsatzTV.Core.Tests.Metadata
                     FFprobePath,
                     DateTimeOffset.MinValue,
                     0,
-                    1);
+                    1,
+                    _ => ValueTask.CompletedTask,
+                    _ => ValueTask.CompletedTask);
+
 
                 result.IsRight.Should().BeTrue();
 
@@ -196,7 +202,10 @@ namespace ErsatzTV.Core.Tests.Metadata
                     FFprobePath,
                     DateTimeOffset.MinValue,
                     0,
-                    1);
+                    1,
+                    _ => ValueTask.CompletedTask,
+                    _ => ValueTask.CompletedTask);
+
 
                 result.IsRight.Should().BeTrue();
 
@@ -242,7 +251,10 @@ namespace ErsatzTV.Core.Tests.Metadata
                     FFprobePath,
                     DateTimeOffset.MinValue,
                     0,
-                    1);
+                    1,
+                    _ => ValueTask.CompletedTask,
+                    _ => ValueTask.CompletedTask);
+
 
                 result.IsRight.Should().BeTrue();
 
@@ -291,7 +303,10 @@ namespace ErsatzTV.Core.Tests.Metadata
                     FFprobePath,
                     DateTimeOffset.MinValue,
                     0,
-                    1);
+                    1,
+                    _ => ValueTask.CompletedTask,
+                    _ => ValueTask.CompletedTask);
+
 
                 result.IsRight.Should().BeTrue();
 
@@ -340,7 +355,10 @@ namespace ErsatzTV.Core.Tests.Metadata
                     FFprobePath,
                     DateTimeOffset.MinValue,
                     0,
-                    1);
+                    1,
+                    _ => ValueTask.CompletedTask,
+                    _ => ValueTask.CompletedTask);
+
 
                 result.IsRight.Should().BeTrue();
 
@@ -388,7 +406,10 @@ namespace ErsatzTV.Core.Tests.Metadata
                     FFprobePath,
                     DateTimeOffset.MinValue,
                     0,
-                    1);
+                    1,
+                    _ => ValueTask.CompletedTask,
+                    _ => ValueTask.CompletedTask);
+
 
                 result.IsRight.Should().BeTrue();
 
@@ -432,7 +453,10 @@ namespace ErsatzTV.Core.Tests.Metadata
                     FFprobePath,
                     DateTimeOffset.MinValue,
                     0,
-                    1);
+                    1,
+                    _ => ValueTask.CompletedTask,
+                    _ => ValueTask.CompletedTask);
+
 
                 result.IsRight.Should().BeTrue();
 
@@ -470,7 +494,10 @@ namespace ErsatzTV.Core.Tests.Metadata
                     FFprobePath,
                     DateTimeOffset.MinValue,
                     0,
-                    1);
+                    1,
+                    _ => ValueTask.CompletedTask,
+                    _ => ValueTask.CompletedTask);
+
 
                 result.IsRight.Should().BeTrue();
 
@@ -510,7 +537,9 @@ namespace ErsatzTV.Core.Tests.Metadata
                     FFprobePath,
                     DateTimeOffset.MinValue,
                     0,
-                    1);
+                    1,
+                    _ => ValueTask.CompletedTask,
+                    _ => ValueTask.CompletedTask);
 
                 result.IsRight.Should().BeTrue();
 
@@ -539,7 +568,10 @@ namespace ErsatzTV.Core.Tests.Metadata
                     FFprobePath,
                     DateTimeOffset.MinValue,
                     0,
-                    1);
+                    1,
+                    _ => ValueTask.CompletedTask,
+                    _ => ValueTask.CompletedTask);
+
 
                 result.IsRight.Should().BeTrue();
 
@@ -556,7 +588,6 @@ namespace ErsatzTV.Core.Tests.Metadata
                     _localMetadataProvider.Object,
                     new Mock<IMetadataRepository>().Object,
                     _imageCache.Object,
-                    new Mock<ISearchIndex>().Object,
                     new Mock<IMediator>().Object,
                     new Mock<ILogger<MovieFolderScanner>>().Object
                 );

ErsatzTV.Core/Interfaces/Metadata/IMovieFolderScanner.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
 using LanguageExt;
@@ -12,6 +13,8 @@ namespace ErsatzTV.Core.Interfaces.Metadata
             string ffprobePath,
             DateTimeOffset lastScan,
             decimal progressMin,
-            decimal progressMax);
+            decimal progressMax,
+            Func<List<MediaItem>, ValueTask> addToSearchIndex,
+            Func<List<int>, ValueTask> removeFromSearchIndex);
     }
 }

ErsatzTV.Core/Interfaces/Metadata/IMusicVideoFolderScanner.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
 using LanguageExt;
@@ -12,6 +13,8 @@ namespace ErsatzTV.Core.Interfaces.Metadata
             string ffprobePath,
             DateTimeOffset lastScan,
             decimal progressMin,
-            decimal progressMax);
+            decimal progressMax,
+            Func<List<MediaItem>, ValueTask> addToSearchIndex,
+            Func<List<int>, ValueTask> removeFromSearchIndex);
     }
 }

ErsatzTV.Core/Interfaces/Metadata/ITelevisionFolderScanner.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
 using LanguageExt;
@@ -12,6 +13,8 @@ namespace ErsatzTV.Core.Interfaces.Metadata
             string ffprobePath,
             DateTimeOffset lastScan,
             decimal progressMin,
-            decimal progressMax);
+            decimal progressMax,
+            Func<List<MediaItem>, ValueTask> addToSearchIndex,
+            Func<List<int>, ValueTask> removeFromSearchIndex);
     }
 }

ErsatzTV.Core/Interfaces/Plex/IPlexMovieLibraryScanner.cs

@@ -1,4 +1,6 @@
-using System.Threading.Tasks;
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Plex;
 using LanguageExt;
@@ -10,6 +12,8 @@ namespace ErsatzTV.Core.Interfaces.Plex
         Task<Either<BaseError, Unit>> ScanLibrary(
             PlexConnection connection,
             PlexServerAuthToken token,
-            PlexLibrary plexMediaSourceLibrary);
+            PlexLibrary plexMediaSourceLibrary,
+            Func<List<MediaItem>, ValueTask> addToSearchIndex,
+            Func<List<int>, ValueTask> removeFromSearchIndex);
     }
 }

ErsatzTV.Core/Interfaces/Plex/IPlexTelevisionLibraryScanner.cs

@@ -1,4 +1,6 @@
-using System.Threading.Tasks;
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Plex;
 using LanguageExt;
@@ -10,6 +12,8 @@ namespace ErsatzTV.Core.Interfaces.Plex
         Task<Either<BaseError, Unit>> ScanLibrary(
             PlexConnection connection,
             PlexServerAuthToken token,
-            PlexLibrary plexMediaSourceLibrary);
+            PlexLibrary plexMediaSourceLibrary,
+            Func<List<MediaItem>, ValueTask> addToSearchIndex,
+            Func<List<int>, ValueTask> removeFromSearchIndex);
     }
 }

ErsatzTV.Core/Metadata/MovieFolderScanner.cs

@@ -8,7 +8,6 @@ using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Interfaces.Images;
 using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
-using ErsatzTV.Core.Interfaces.Search;
 using LanguageExt;
 using MediatR;
 using Microsoft.Extensions.Logging;
@@ -25,7 +24,6 @@ namespace ErsatzTV.Core.Metadata
         private readonly ILogger<MovieFolderScanner> _logger;
         private readonly IMediator _mediator;
         private readonly IMovieRepository _movieRepository;
-        private readonly ISearchIndex _searchIndex;
 
         public MovieFolderScanner(
             ILocalFileSystem localFileSystem,
@@ -34,7 +32,6 @@ namespace ErsatzTV.Core.Metadata
             ILocalMetadataProvider localMetadataProvider,
             IMetadataRepository metadataRepository,
             IImageCache imageCache,
-            ISearchIndex searchIndex,
             IMediator mediator,
             ILogger<MovieFolderScanner> logger)
             : base(localFileSystem, localStatisticsProvider, metadataRepository, imageCache, logger)
@@ -42,7 +39,6 @@ namespace ErsatzTV.Core.Metadata
             _localFileSystem = localFileSystem;
             _movieRepository = movieRepository;
             _localMetadataProvider = localMetadataProvider;
-            _searchIndex = searchIndex;
             _mediator = mediator;
             _logger = logger;
         }
@@ -52,7 +48,9 @@ namespace ErsatzTV.Core.Metadata
             string ffprobePath,
             DateTimeOffset lastScan,
             decimal progressMin,
-            decimal progressMax)
+            decimal progressMax,
+            Func<List<MediaItem>, ValueTask> addToSearchIndex,
+            Func<List<int>, ValueTask> removeFromSearchIndex)
         {
             decimal progressSpread = progressMax - progressMin;
 
@@ -111,17 +109,7 @@ namespace ErsatzTV.Core.Metadata
                         .BindT(movie => UpdateArtwork(movie, ArtworkKind.FanArt));
 
                     await maybeMovie.Match(
-                        async result =>
-                        {
-                            if (result.IsAdded)
-                            {
-                                await _searchIndex.AddItems(new List<MediaItem> { result.Item });
-                            }
-                            else if (result.IsUpdated)
-                            {
-                                await _searchIndex.UpdateItems(new List<MediaItem> { result.Item });
-                            }
-                        },
+                        async result => await addToSearchIndex(new List<MediaItem> { result.Item }),
                         error =>
                         {
                             _logger.LogWarning("Error processing movie at {Path}: {Error}", file, error.Value);
@@ -136,7 +124,7 @@ namespace ErsatzTV.Core.Metadata
                 {
                     _logger.LogInformation("Removing missing movie at {Path}", path);
                     List<int> ids = await _movieRepository.DeleteByPath(libraryPath, path);
-                    await _searchIndex.RemoveItems(ids);
+                    await removeFromSearchIndex(ids);
                 }
             }
 

ErsatzTV.Core/Metadata/MusicVideoFolderScanner.cs

@@ -8,7 +8,6 @@ using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Interfaces.Images;
 using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
-using ErsatzTV.Core.Interfaces.Search;
 using LanguageExt;
 using MediatR;
 using Microsoft.Extensions.Logging;
@@ -24,7 +23,6 @@ namespace ErsatzTV.Core.Metadata
         private readonly ILogger<MusicVideoFolderScanner> _logger;
         private readonly IMediator _mediator;
         private readonly IMusicVideoRepository _musicVideoRepository;
-        private readonly ISearchIndex _searchIndex;
 
         public MusicVideoFolderScanner(
             ILocalFileSystem localFileSystem,
@@ -32,7 +30,6 @@ namespace ErsatzTV.Core.Metadata
             ILocalMetadataProvider localMetadataProvider,
             IMetadataRepository metadataRepository,
             IImageCache imageCache,
-            ISearchIndex searchIndex,
             IMusicVideoRepository musicVideoRepository,
             IMediator mediator,
             ILogger<MusicVideoFolderScanner> logger) : base(
@@ -44,7 +41,6 @@ namespace ErsatzTV.Core.Metadata
         {
             _localFileSystem = localFileSystem;
             _localMetadataProvider = localMetadataProvider;
-            _searchIndex = searchIndex;
             _musicVideoRepository = musicVideoRepository;
             _mediator = mediator;
             _logger = logger;
@@ -55,7 +51,9 @@ namespace ErsatzTV.Core.Metadata
             string ffprobePath,
             DateTimeOffset lastScan,
             decimal progressMin,
-            decimal progressMax)
+            decimal progressMax,
+            Func<List<MediaItem>, ValueTask> addToSearchIndex,
+            Func<List<int>, ValueTask> removeFromSearchIndex)
         {
             decimal progressSpread = progressMax - progressMin;
 
@@ -104,17 +102,7 @@ namespace ErsatzTV.Core.Metadata
                         .BindT(UpdateThumbnail);
 
                     await maybeMusicVideo.Match(
-                        async result =>
-                        {
-                            if (result.IsAdded)
-                            {
-                                await _searchIndex.AddItems(new List<MediaItem> { result.Item });
-                            }
-                            else if (result.IsUpdated)
-                            {
-                                await _searchIndex.UpdateItems(new List<MediaItem> { result.Item });
-                            }
-                        },
+                        async result => await addToSearchIndex(new List<MediaItem> { result.Item }),
                         error =>
                         {
                             _logger.LogWarning("Error processing music video at {Path}: {Error}", file, error.Value);
@@ -129,7 +117,7 @@ namespace ErsatzTV.Core.Metadata
                 {
                     _logger.LogInformation("Removing missing music video at {Path}", path);
                     List<int> ids = await _musicVideoRepository.DeleteByPath(libraryPath, path);
-                    await _searchIndex.RemoveItems(ids);
+                    await removeFromSearchIndex(ids);
                 }
             }
 

ErsatzTV.Core/Metadata/TelevisionFolderScanner.cs

@@ -8,7 +8,6 @@ using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Interfaces.Images;
 using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
-using ErsatzTV.Core.Interfaces.Search;
 using LanguageExt;
 using MediatR;
 using Microsoft.Extensions.Logging;
@@ -23,7 +22,6 @@ namespace ErsatzTV.Core.Metadata
         private readonly ILocalMetadataProvider _localMetadataProvider;
         private readonly ILogger<TelevisionFolderScanner> _logger;
         private readonly IMediator _mediator;
-        private readonly ISearchIndex _searchIndex;
         private readonly ITelevisionRepository _televisionRepository;
 
         public TelevisionFolderScanner(
@@ -33,7 +31,6 @@ namespace ErsatzTV.Core.Metadata
             ILocalMetadataProvider localMetadataProvider,
             IMetadataRepository metadataRepository,
             IImageCache imageCache,
-            ISearchIndex searchIndex,
             IMediator mediator,
             ILogger<TelevisionFolderScanner> logger) : base(
             localFileSystem,
@@ -45,7 +42,6 @@ namespace ErsatzTV.Core.Metadata
             _localFileSystem = localFileSystem;
             _televisionRepository = televisionRepository;
             _localMetadataProvider = localMetadataProvider;
-            _searchIndex = searchIndex;
             _mediator = mediator;
             _logger = logger;
         }
@@ -55,7 +51,9 @@ namespace ErsatzTV.Core.Metadata
             string ffprobePath,
             DateTimeOffset lastScan,
             decimal progressMin,
-            decimal progressMax)
+            decimal progressMax,
+            Func<List<MediaItem>, ValueTask> addToSearchIndex,
+            Func<List<int>, ValueTask> removeFromSearchIndex)
         {
             decimal progressSpread = progressMax - progressMin;
 
@@ -84,15 +82,7 @@ namespace ErsatzTV.Core.Metadata
                 await maybeShow.Match(
                     async result =>
                     {
-                        if (result.IsAdded)
-                        {
-                            await _searchIndex.AddItems(new List<MediaItem> { result.Item });
-                        }
-                        else if (result.IsUpdated)
-                        {
-                            await _searchIndex.UpdateItems(new List<MediaItem> { result.Item });
-                        }
-
+                        await addToSearchIndex(new List<MediaItem> { result.Item });
                         await ScanSeasons(
                             libraryPath,
                             ffprobePath,
@@ -122,7 +112,7 @@ namespace ErsatzTV.Core.Metadata
 
             await _televisionRepository.DeleteEmptySeasons(libraryPath);
             List<int> ids = await _televisionRepository.DeleteEmptyShows(libraryPath);
-            await _searchIndex.RemoveItems(ids);
+            await removeFromSearchIndex(ids);
 
             return Unit.Default;
         }

ErsatzTV.Core/Plex/PlexMovieLibraryScanner.cs

@@ -1,10 +1,10 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Plex;
 using ErsatzTV.Core.Interfaces.Repositories;
-using ErsatzTV.Core.Interfaces.Search;
 using ErsatzTV.Core.Metadata;
 using LanguageExt;
 using MediatR;
@@ -20,13 +20,11 @@ namespace ErsatzTV.Core.Plex
         private readonly IMetadataRepository _metadataRepository;
         private readonly IMovieRepository _movieRepository;
         private readonly IPlexServerApiClient _plexServerApiClient;
-        private readonly ISearchIndex _searchIndex;
 
         public PlexMovieLibraryScanner(
             IPlexServerApiClient plexServerApiClient,
             IMovieRepository movieRepository,
             IMetadataRepository metadataRepository,
-            ISearchIndex searchIndex,
             IMediator mediator,
             ILogger<PlexMovieLibraryScanner> logger)
             : base(metadataRepository, logger)
@@ -34,7 +32,6 @@ namespace ErsatzTV.Core.Plex
             _plexServerApiClient = plexServerApiClient;
             _movieRepository = movieRepository;
             _metadataRepository = metadataRepository;
-            _searchIndex = searchIndex;
             _mediator = mediator;
             _logger = logger;
         }
@@ -42,7 +39,9 @@ namespace ErsatzTV.Core.Plex
         public async Task<Either<BaseError, Unit>> ScanLibrary(
             PlexConnection connection,
             PlexServerAuthToken token,
-            PlexLibrary plexMediaSourceLibrary)
+            PlexLibrary plexMediaSourceLibrary,
+            Func<List<MediaItem>, ValueTask> addToSearchIndex,
+            Func<List<int>, ValueTask> removeFromSearchIndex)
         {
             Either<BaseError, List<PlexMovie>> entries = await _plexServerApiClient.GetMovieLibraryContents(
                 plexMediaSourceLibrary,
@@ -65,17 +64,7 @@ namespace ErsatzTV.Core.Plex
                             .BindT(existing => UpdateArtwork(existing, incoming));
 
                         await maybeMovie.Match(
-                            async result =>
-                            {
-                                if (result.IsAdded)
-                                {
-                                    await _searchIndex.AddItems(new List<MediaItem> { result.Item });
-                                }
-                                else if (result.IsUpdated)
-                                {
-                                    await _searchIndex.UpdateItems(new List<MediaItem> { result.Item });
-                                }
-                            },
+                            async result => await addToSearchIndex(new List<MediaItem> { result.Item }),
                             error =>
                             {
                                 _logger.LogWarning(
@@ -88,7 +77,7 @@ namespace ErsatzTV.Core.Plex
 
                     var movieKeys = movieEntries.Map(s => s.Key).ToList();
                     List<int> ids = await _movieRepository.RemoveMissingPlexMovies(plexMediaSourceLibrary, movieKeys);
-                    await _searchIndex.RemoveItems(ids);
+                    await removeFromSearchIndex(ids);
 
                     await _mediator.Publish(new LibraryScanProgress(plexMediaSourceLibrary.Id, 0));
                 },

ErsatzTV.Core/Plex/PlexTelevisionLibraryScanner.cs

@@ -1,10 +1,10 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Plex;
 using ErsatzTV.Core.Interfaces.Repositories;
-using ErsatzTV.Core.Interfaces.Search;
 using ErsatzTV.Core.Metadata;
 using LanguageExt;
 using MediatR;
@@ -20,14 +20,12 @@ namespace ErsatzTV.Core.Plex
         private readonly IMediator _mediator;
         private readonly IMetadataRepository _metadataRepository;
         private readonly IPlexServerApiClient _plexServerApiClient;
-        private readonly ISearchIndex _searchIndex;
         private readonly ITelevisionRepository _televisionRepository;
 
         public PlexTelevisionLibraryScanner(
             IPlexServerApiClient plexServerApiClient,
             ITelevisionRepository televisionRepository,
             IMetadataRepository metadataRepository,
-            ISearchIndex searchIndex,
             IMediator mediator,
             ILogger<PlexTelevisionLibraryScanner> logger)
             : base(metadataRepository, logger)
@@ -35,7 +33,6 @@ namespace ErsatzTV.Core.Plex
             _plexServerApiClient = plexServerApiClient;
             _televisionRepository = televisionRepository;
             _metadataRepository = metadataRepository;
-            _searchIndex = searchIndex;
             _mediator = mediator;
             _logger = logger;
         }
@@ -43,7 +40,9 @@ namespace ErsatzTV.Core.Plex
         public async Task<Either<BaseError, Unit>> ScanLibrary(
             PlexConnection connection,
             PlexServerAuthToken token,
-            PlexLibrary plexMediaSourceLibrary)
+            PlexLibrary plexMediaSourceLibrary,
+            Func<List<MediaItem>, ValueTask> addToSearchIndex,
+            Func<List<int>, ValueTask> removeFromSearchIndex)
         {
             Either<BaseError, List<PlexShow>> entries = await _plexServerApiClient.GetShowLibraryContents(
                 plexMediaSourceLibrary,
@@ -67,15 +66,7 @@ namespace ErsatzTV.Core.Plex
                         await maybeShow.Match(
                             async result =>
                             {
-                                if (result.IsAdded)
-                                {
-                                    await _searchIndex.AddItems(new List<MediaItem> { result.Item });
-                                }
-                                else if (result.IsUpdated)
-                                {
-                                    await _searchIndex.UpdateItems(new List<MediaItem> { result.Item });
-                                }
-
+                                await addToSearchIndex(new List<MediaItem> { result.Item });
                                 await ScanSeasons(plexMediaSourceLibrary, result.Item, connection, token);
                             },
                             error =>
@@ -91,7 +82,7 @@ namespace ErsatzTV.Core.Plex
                     var showKeys = showEntries.Map(s => s.Key).ToList();
                     List<int> ids =
                         await _televisionRepository.RemoveMissingPlexShows(plexMediaSourceLibrary, showKeys);
-                    await _searchIndex.RemoveItems(ids);
+                    await removeFromSearchIndex(ids);
 
                     await _mediator.Publish(new LibraryScanProgress(plexMediaSourceLibrary.Id, 0));
 

ErsatzTV/Pages/Movie.razor

@@ -19,7 +19,7 @@
         @if (!string.IsNullOrWhiteSpace(_movie.Poster))
         {
             <img class="mud-elevation-2 mr-6"
-                 style="border-radius: 4px; max-height: 440px; flex-shrink: 0"
+                 style="border-radius: 4px; flex-shrink: 0; max-height: 440px;"
                  src="@($"/artwork/posters/{_movie.Poster}")" alt="movie poster"/>
         }
         <div style="display: flex; flex-direction: column; height: 100%">

ErsatzTV/Pages/MovieList.razor

@@ -130,7 +130,10 @@
 
     private void SelectClicked(MediaCardViewModel card, MouseEventArgs e)
     {
-        List<MediaCardViewModel> GetSortedItems() => _data.Cards.OrderBy(m => m.SortTitle).ToList<MediaCardViewModel>();
+        List<MediaCardViewModel> GetSortedItems()
+        {
+            return _data.Cards.OrderBy(m => m.SortTitle).ToList<MediaCardViewModel>();
+        }
 
         SelectClicked(GetSortedItems, card, e);
     }

ErsatzTV/Pages/MusicVideoList.razor

@@ -131,7 +131,10 @@
 
     private void SelectClicked(MediaCardViewModel card, MouseEventArgs e)
     {
-        List<MediaCardViewModel> GetSortedItems() => _data.Cards.OrderBy(m => m.SortTitle).ToList<MediaCardViewModel>();
+        List<MediaCardViewModel> GetSortedItems()
+        {
+            return _data.Cards.OrderBy(m => m.SortTitle).ToList<MediaCardViewModel>();
+        }
 
         SelectClicked(GetSortedItems, card, e);
     }

ErsatzTV/Pages/TelevisionEpisodeList.razor

@@ -29,7 +29,7 @@
         @if (!string.IsNullOrWhiteSpace(_season.Poster))
         {
             <img class="mud-elevation-2 mr-6"
-                 style="border-radius: 4px; max-height: 440px; flex-shrink: 0"
+                 style="border-radius: 4px; flex-shrink: 0; max-height: 440px;"
                  src="@($"/artwork/posters/{_season.Poster}")" alt="show poster"/>
         }
         <div style="display: flex; flex-direction: column; height: 100%">

ErsatzTV/Pages/TelevisionSeasonList.razor

@@ -27,7 +27,7 @@
         @if (!string.IsNullOrWhiteSpace(_show.Poster))
         {
             <img class="mud-elevation-2 mr-6"
-                 style="border-radius: 4px; max-height: 440px; flex-shrink: 0"
+                 style="border-radius: 4px; flex-shrink: 0; max-height: 440px;"
                  src="@($"/artwork/posters/{_show.Poster}")" alt="show poster"/>
         }
         <div style="display: flex; flex-direction: column; height: 100%">

ErsatzTV/Pages/TelevisionShowList.razor

@@ -130,7 +130,10 @@
 
     private void SelectClicked(MediaCardViewModel card, MouseEventArgs e)
     {
-        List<MediaCardViewModel> GetSortedItems() => _data.Cards.OrderBy(m => m.SortTitle).ToList<MediaCardViewModel>();
+        List<MediaCardViewModel> GetSortedItems()
+        {
+            return _data.Cards.OrderBy(m => m.SortTitle).ToList<MediaCardViewModel>();
+        }
 
         SelectClicked(GetSortedItems, card, e);
     }

ErsatzTV/Services/SchedulerService.cs

@@ -24,6 +24,7 @@ namespace ErsatzTV.Services
         private readonly IEntityLocker _entityLocker;
         private readonly ILogger<SchedulerService> _logger;
         private readonly ChannelWriter<IPlexBackgroundServiceRequest> _plexWorkerChannel;
+        private readonly ChannelWriter<ISearchBackgroundServiceRequest> _searchWorkerChannel;
         private readonly IServiceScopeFactory _serviceScopeFactory;
         private readonly ChannelWriter<IBackgroundServiceRequest> _workerChannel;
 
@@ -31,12 +32,14 @@ namespace ErsatzTV.Services
             IServiceScopeFactory serviceScopeFactory,
             ChannelWriter<IBackgroundServiceRequest> workerChannel,
             ChannelWriter<IPlexBackgroundServiceRequest> plexWorkerChannel,
+            ChannelWriter<ISearchBackgroundServiceRequest> searchWorkerChannel,
             IEntityLocker entityLocker,
             ILogger<SchedulerService> logger)
         {
             _serviceScopeFactory = serviceScopeFactory;
             _workerChannel = workerChannel;
             _plexWorkerChannel = plexWorkerChannel;
+            _searchWorkerChannel = searchWorkerChannel;
             _entityLocker = entityLocker;
             _logger = logger;
         }
@@ -123,6 +126,6 @@ namespace ErsatzTV.Services
         }
 
         private ValueTask RebuildSearchIndex(CancellationToken cancellationToken) =>
-            _workerChannel.WriteAsync(new RebuildSearchIndex(), cancellationToken);
+            _searchWorkerChannel.WriteAsync(new RebuildSearchIndex(), cancellationToken);
     }
 }

ErsatzTV/Services/SearchIndexService.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Threading;
+using System.Threading.Channels;
+using System.Threading.Tasks;
+using ErsatzTV.Application;
+using ErsatzTV.Application.Search.Commands;
+using MediatR;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace ErsatzTV.Services
+{
+    public class SearchIndexService : BackgroundService
+    {
+        private readonly ChannelReader<ISearchBackgroundServiceRequest> _channel;
+        private readonly ILogger<SearchIndexService> _logger;
+        private readonly IServiceScopeFactory _serviceScopeFactory;
+
+        public SearchIndexService(
+            ChannelReader<ISearchBackgroundServiceRequest> channel,
+            IServiceScopeFactory serviceScopeFactory,
+            ILogger<SearchIndexService> logger)
+        {
+            _channel = channel;
+            _serviceScopeFactory = serviceScopeFactory;
+            _logger = logger;
+        }
+
+        protected override async Task ExecuteAsync(CancellationToken cancellationToken)
+        {
+            _logger.LogInformation("Search index service started");
+
+            await foreach (ISearchBackgroundServiceRequest request in _channel.ReadAllAsync(cancellationToken))
+            {
+                try
+                {
+                    using IServiceScope scope = _serviceScopeFactory.CreateScope();
+                    IMediator mediator = scope.ServiceProvider.GetRequiredService<IMediator>();
+
+                    switch (request)
+                    {
+                        case RebuildSearchIndex rebuildSearchIndex:
+                            await mediator.Send(rebuildSearchIndex, cancellationToken);
+                            break;
+                        case AddItemsToSearchIndex addItemsToSearchIndex:
+                            await mediator.Send(addItemsToSearchIndex, cancellationToken);
+                            break;
+                        case RemoveItemsFromSearchIndex removeItemsFromSearchIndex:
+                            await mediator.Send(removeItemsFromSearchIndex, cancellationToken);
+                            break;
+                    }
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogWarning(ex, "Failed to process search index service request");
+                }
+            }
+        }
+    }
+}

ErsatzTV/Shared/FragmentLetterAnchor.razor

@@ -1,5 +1,4 @@
-@using ErsatzTV.Application.MediaCards
-@using LanguageExt.UnsafeValueAccess
+@using LanguageExt.UnsafeValueAccess
 @typeparam TCard
 
 @{ var letters = new System.Collections.Generic.HashSet<char>(); }
@@ -25,4 +24,4 @@
     {
         @ChildContent
     }
-}
+}

ErsatzTV/Startup.cs

@@ -187,6 +187,7 @@ namespace ErsatzTV
             services.AddSingleton<IEntityLocker, EntityLocker>();
             AddChannel<IBackgroundServiceRequest>(services);
             AddChannel<IPlexBackgroundServiceRequest>(services);
+            AddChannel<ISearchBackgroundServiceRequest>(services);
 
             services.AddScoped<IChannelRepository, ChannelRepository>();
             services.AddScoped<IFFmpegProfileRepository, FFmpegProfileRepository>();