rework emby collection scanning (#1205)

* optimize emby collection scan frequency

* add button to sync emby collections

* update changelog

* fix scanning; add progress indicator

CHANGELOG.md

@@ -21,6 +21,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   - Playout builds are no longer blocked by library scans
   - Adding Trakt lists is no longer blocked by library scans
   - All library scans (local and media servers) run sequentially
+- Emby collection scanning will no longer happen after every (automatic or forced) library scan
+  - Automatic/periodic scans will check collections one time after all libraries have been scanned
+  - There is a new table in the `Media` > `Libraries` page with a button to manually re-scan Emby collections as needed
 
 ## [0.7.5-beta] - 2023-03-05
 ### Added

ErsatzTV.Application/Emby/Commands/CallEmbyCollectionScannerHandler.cs

@@ -0,0 +1,82 @@
+using System.Threading.Channels;
+using ErsatzTV.Application.Libraries;
+using ErsatzTV.Core;
+using ErsatzTV.Core.Errors;
+using ErsatzTV.Core.Interfaces.Repositories;
+using ErsatzTV.FFmpeg.Runtime;
+using ErsatzTV.Infrastructure.Data;
+using ErsatzTV.Infrastructure.Extensions;
+using Microsoft.EntityFrameworkCore;
+
+namespace ErsatzTV.Application.Emby;
+
+public class CallEmbyCollectionScannerHandler : CallLibraryScannerHandler<SynchronizeEmbyCollections>,
+    IRequestHandler<SynchronizeEmbyCollections, Either<BaseError, Unit>>
+{
+    public CallEmbyCollectionScannerHandler(
+        IDbContextFactory<TvContext> dbContextFactory,
+        IConfigElementRepository configElementRepository,
+        ChannelWriter<ISearchIndexBackgroundServiceRequest> channel,
+        IMediator mediator,
+        IRuntimeInfo runtimeInfo) : base(dbContextFactory, configElementRepository, channel, mediator, runtimeInfo)
+    {
+    }
+
+    protected override async Task<DateTimeOffset> GetLastScan(TvContext dbContext, SynchronizeEmbyCollections request)
+    {
+        DateTime minDateTime = await dbContext.EmbyMediaSources
+            .SelectOneAsync(l => l.Id, l => l.Id == request.EmbyMediaSourceId)
+            .Match(l => l.LastCollectionsScan ?? SystemTime.MinValueUtc, () => SystemTime.MaxValueUtc);
+
+        return new DateTimeOffset(minDateTime, TimeSpan.Zero);
+    }
+
+    protected override bool ScanIsRequired(
+        DateTimeOffset lastScan,
+        int libraryRefreshInterval,
+        SynchronizeEmbyCollections request)
+    {
+        if (lastScan == SystemTime.MaxValueUtc)
+        {
+            return false;
+        }
+
+        DateTimeOffset nextScan = lastScan + TimeSpan.FromHours(libraryRefreshInterval);
+        return request.ForceScan || (libraryRefreshInterval > 0 && nextScan < DateTimeOffset.Now);
+    }
+
+    public async Task<Either<BaseError, Unit>>
+        Handle(SynchronizeEmbyCollections request, CancellationToken cancellationToken)
+    {
+        Validation<BaseError, string> validation = await Validate(request);
+        return await validation.Match(
+            scanner => PerformScan(scanner, request, cancellationToken),
+            error =>
+            {
+                foreach (ScanIsNotRequired scanIsNotRequired in error.OfType<ScanIsNotRequired>())
+                {
+                    return Task.FromResult<Either<BaseError, Unit>>(scanIsNotRequired);
+                }
+
+                return Task.FromResult<Either<BaseError, Unit>>(error.Join());
+            });
+    }
+    
+    private async Task<Either<BaseError, Unit>> PerformScan(
+        string scanner,
+        SynchronizeEmbyCollections request,
+        CancellationToken cancellationToken)
+    {
+        var arguments = new List<string>
+        {
+            "scan-emby-collections", request.EmbyMediaSourceId.ToString()
+        };
+
+        if (request.ForceScan)
+        {
+            arguments.Add("--force");
+        }
+
+        return await base.PerformScan(scanner, arguments, cancellationToken).MapT(_ => Unit.Default);
+    }
+}

ErsatzTV.Application/Emby/Commands/SynchronizeEmbyCollections.cs

@@ -0,0 +1,6 @@
+using ErsatzTV.Core;
+
+namespace ErsatzTV.Application.Emby;
+
+public record SynchronizeEmbyCollections(int EmbyMediaSourceId, bool ForceScan) : IRequest<Either<BaseError, Unit>>,
+    IScannerBackgroundServiceRequest;

ErsatzTV.Application/Libraries/Queries/GetExternalCollections.cs

@@ -0,0 +1,3 @@
+namespace ErsatzTV.Application.Libraries;
+
+public record GetExternalCollections : IRequest<List<LibraryViewModel>>;

ErsatzTV.Application/Libraries/Queries/GetExternalCollectionsHandler.cs

@@ -0,0 +1,35 @@
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Infrastructure.Data;
+using Microsoft.EntityFrameworkCore;
+
+namespace ErsatzTV.Application.Libraries;
+
+public class GetExternalCollectionsHandler : IRequestHandler<GetExternalCollections, List<LibraryViewModel>>
+{
+    private readonly IDbContextFactory<TvContext> _dbContextFactory;
+
+    public GetExternalCollectionsHandler(IDbContextFactory<TvContext> dbContextFactory)
+    {
+        _dbContextFactory = dbContextFactory;
+    }
+
+    public async Task<List<LibraryViewModel>> Handle(
+        GetExternalCollections request,
+        CancellationToken cancellationToken)
+    {
+        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync(cancellationToken);
+        List<int> mediaSourceIds = await dbContext.EmbyMediaSources
+            .Filter(ems => ems.Libraries.Any(l => ((EmbyLibrary)l).ShouldSyncItems))
+            .Map(ems => ems.Id)
+            .ToListAsync(cancellationToken: cancellationToken);
+
+        return mediaSourceIds.Map(
+                id => new LibraryViewModel(
+                    "Emby",
+                    0,
+                    "Collections",
+                    0,
+                    id))
+            .ToList();
+    }
+}

ErsatzTV.Core/Domain/MediaSource/EmbyMediaSource.cs

@@ -6,4 +6,5 @@ public class EmbyMediaSource : MediaSource
     public string OperatingSystem { get; set; }
     public List<EmbyConnection> Connections { get; set; }
     public List<EmbyPathReplacement> PathReplacements { get; set; }
+    public DateTime? LastCollectionsScan { get; set; }
 }

ErsatzTV.Core/Interfaces/Locking/IEntityLocker.cs

@@ -6,6 +6,7 @@ public interface IEntityLocker
     event EventHandler OnPlexChanged;
     event EventHandler<Type> OnRemoteMediaSourceChanged;
     event EventHandler OnTraktChanged;
+    event EventHandler OnEmbyCollectionsChanged;
     bool LockLibrary(int libraryId);
     bool UnlockLibrary(int libraryId);
     bool IsLibraryLocked(int libraryId);
@@ -18,4 +19,7 @@ public interface IEntityLocker
     bool IsTraktLocked();
     bool LockTrakt();
     bool UnlockTrakt();
+    bool LockEmbyCollections();
+    bool UnlockEmbyCollections();
+    bool AreEmbyCollectionsLocked();
 }

ErsatzTV.Core/Interfaces/Repositories/IMediaSourceRepository.cs

@@ -83,4 +83,5 @@ public interface IMediaSourceRepository
     Task<List<int>> DeleteAllEmby();
     Task<Unit> EnableEmbyLibrarySync(IEnumerable<int> libraryIds);
     Task<List<int>> DisableEmbyLibrarySync(List<int> libraryIds);
+    Task<Unit> UpdateLastScan(EmbyMediaSource embyMediaSource);
 }

ErsatzTV.Infrastructure/Data/Repositories/MediaSourceRepository.cs

@@ -865,4 +865,12 @@ public class MediaSourceRepository : IMediaSourceRepository
 
         return deletedMediaIds;
     }
+
+    public async Task<Unit> UpdateLastScan(EmbyMediaSource embyMediaSource)
+    {
+        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync();
+        return await dbContext.Connection.ExecuteAsync(
+            "UPDATE EmbyMediaSource SET LastCollectionsScan = @LastCollectionsScan WHERE Id = @Id",
+            new { embyMediaSource.LastCollectionsScan, embyMediaSource.Id }).ToUnit();
+    }
 }

ErsatzTV.Infrastructure/Locking/EntityLocker.cs

@@ -9,6 +9,7 @@ public class EntityLocker : IEntityLocker
     private readonly ConcurrentDictionary<Type, byte> _lockedRemoteMediaSourceTypes;
     private bool _plex;
     private bool _trakt;
+    private bool _embyCollections;
 
     public EntityLocker()
     {
@@ -20,6 +21,7 @@ public class EntityLocker : IEntityLocker
     public event EventHandler OnPlexChanged;
     public event EventHandler<Type> OnRemoteMediaSourceChanged;
     public event EventHandler OnTraktChanged;
+    public event EventHandler OnEmbyCollectionsChanged;
 
     public bool LockLibrary(int libraryId)
     {
@@ -127,4 +129,30 @@ public class EntityLocker : IEntityLocker
     }
 
     public bool IsTraktLocked() => _trakt;
+    
+    public bool LockEmbyCollections()
+    {
+        if (!_embyCollections)
+        {
+            _embyCollections = true;
+            OnEmbyCollectionsChanged?.Invoke(this, EventArgs.Empty);
+            return true;
+        }
+
+        return false;
+    }
+
+    public bool UnlockEmbyCollections()
+    {
+        if (_embyCollections)
+        {
+            _embyCollections = false;
+            OnEmbyCollectionsChanged?.Invoke(this, EventArgs.Empty);
+            return true;
+        }
+
+        return false;
+    }
+
+    public bool AreEmbyCollectionsLocked() => _embyCollections;
 }

ErsatzTV.Infrastructure/Migrations/20230312015133_Add_EmbyMediaSource_LastCollectionScan.cs

@@ -0,0 +1,29 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    /// <inheritdoc />
+    public partial class Add_EmbyMediaSource_LastCollectionScan : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<DateTime>(
+                name: "LastCollectionsScan",
+                table: "EmbyMediaSource",
+                type: "TEXT",
+                nullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "LastCollectionsScan",
+                table: "EmbyMediaSource");
+        }
+    }
+}

ErsatzTV.Infrastructure/Migrations/TvContextModelSnapshot.cs

@@ -15,7 +15,7 @@ namespace ErsatzTV.Infrastructure.Migrations
         protected override void BuildModel(ModelBuilder modelBuilder)
         {
 #pragma warning disable 612, 618
-            modelBuilder.HasAnnotation("ProductVersion", "7.0.2");
+            modelBuilder.HasAnnotation("ProductVersion", "7.0.3");
 
             modelBuilder.Entity("ErsatzTV.Core.Domain.Actor", b =>
                 {
@@ -2445,6 +2445,9 @@ namespace ErsatzTV.Infrastructure.Migrations
                 {
                     b.HasBaseType("ErsatzTV.Core.Domain.MediaSource");
 
+                    b.Property<DateTime?>("LastCollectionsScan")
+                        .HasColumnType("TEXT");
+
                     b.Property<string>("OperatingSystem")
                         .HasColumnType("TEXT");
 

ErsatzTV.Scanner/Application/Emby/Commands/SynchronizeEmbyCollections.cs

@@ -2,4 +2,4 @@
 
 namespace ErsatzTV.Scanner.Application.Emby;
 
-public record SynchronizeEmbyCollections(int EmbyMediaSourceId) : IRequest<Either<BaseError, Unit>>;
+public record SynchronizeEmbyCollections(int EmbyMediaSourceId, bool ForceScan) : IRequest<Either<BaseError, Unit>>;

ErsatzTV.Scanner/Application/Emby/Commands/SynchronizeEmbyCollectionsHandler.cs

@@ -11,32 +11,50 @@ public class SynchronizeEmbyCollectionsHandler : IRequestHandler<SynchronizeEmby
     private readonly IEmbySecretStore _embySecretStore;
     private readonly IMediaSourceRepository _mediaSourceRepository;
     private readonly IEmbyCollectionScanner _scanner;
+    private readonly IConfigElementRepository _configElementRepository;
 
     public SynchronizeEmbyCollectionsHandler(
         IMediaSourceRepository mediaSourceRepository,
         IEmbySecretStore embySecretStore,
-        IEmbyCollectionScanner scanner)
+        IEmbyCollectionScanner scanner,
+        IConfigElementRepository configElementRepository)
     {
         _mediaSourceRepository = mediaSourceRepository;
         _embySecretStore = embySecretStore;
         _scanner = scanner;
+        _configElementRepository = configElementRepository;
     }
 
     public async Task<Either<BaseError, Unit>> Handle(
         SynchronizeEmbyCollections request,
         CancellationToken cancellationToken)
     {
-        Validation<BaseError, ConnectionParameters> validation = await Validate(request);
+        Validation<BaseError, RequestParameters> validation = await Validate(request);
         return await validation.Match(
             SynchronizeCollections,
             error => Task.FromResult<Either<BaseError, Unit>>(error.Join()));
     }
 
-    private Task<Validation<BaseError, ConnectionParameters>> Validate(SynchronizeEmbyCollections request) =>
-        MediaSourceMustExist(request)
+    private async Task<Validation<BaseError, RequestParameters>> Validate(SynchronizeEmbyCollections request)
+    {
+        Task<Validation<BaseError, ConnectionParameters>> mediaSource = MediaSourceMustExist(request)
             .BindT(MediaSourceMustHaveActiveConnection)
             .BindT(MediaSourceMustHaveApiKey);
 
+        return (await mediaSource, await ValidateLibraryRefreshInterval())
+            .Apply(
+                (connectionParameters, libraryRefreshInterval) => new RequestParameters(
+                    connectionParameters,
+                    connectionParameters.MediaSource,
+                    request.ForceScan,
+                    libraryRefreshInterval));
+    }
+
+    private Task<Validation<BaseError, int>> ValidateLibraryRefreshInterval() =>
+        _configElementRepository.GetValue<int>(ConfigElementKey.LibraryRefreshInterval)
+            .FilterT(lri => lri is >= 0 and < 1_000_000)
+            .Map(lri => lri.ToValidation<BaseError>("Library refresh interval is invalid"));
+
     private Task<Validation<BaseError, EmbyMediaSource>> MediaSourceMustExist(
         SynchronizeEmbyCollections request) =>
         _mediaSourceRepository.GetEmby(request.EmbyMediaSourceId)
@@ -46,7 +64,7 @@ public class SynchronizeEmbyCollectionsHandler : IRequestHandler<SynchronizeEmby
         EmbyMediaSource embyMediaSource)
     {
         Option<EmbyConnection> maybeConnection = embyMediaSource.Connections.HeadOrNone();
-        return maybeConnection.Map(connection => new ConnectionParameters(connection))
+        return maybeConnection.Map(connection => new ConnectionParameters(connection, embyMediaSource))
             .ToValidation<BaseError>("Emby media source requires an active connection");
     }
 
@@ -60,12 +78,37 @@ public class SynchronizeEmbyCollectionsHandler : IRequestHandler<SynchronizeEmby
             .ToValidation<BaseError>("Emby media source requires an api key");
     }
 
-    private async Task<Either<BaseError, Unit>> SynchronizeCollections(ConnectionParameters connectionParameters) =>
-        await _scanner.ScanCollections(
-            connectionParameters.ActiveConnection.Address,
-            connectionParameters.ApiKey);
+    private async Task<Either<BaseError, Unit>> SynchronizeCollections(RequestParameters parameters)
+    {
+        var lastScan = new DateTimeOffset(
+            parameters.MediaSource.LastCollectionsScan ?? SystemTime.MinValueUtc,
+            TimeSpan.Zero);
+        DateTimeOffset nextScan = lastScan + TimeSpan.FromHours(parameters.LibraryRefreshInterval);
+        if (parameters.ForceScan || (parameters.LibraryRefreshInterval > 0 && nextScan < DateTimeOffset.Now))
+        {
+            Either<BaseError, Unit> result = await _scanner.ScanCollections(
+                parameters.ConnectionParameters.ActiveConnection.Address,
+                parameters.ConnectionParameters.ApiKey);
 
-    private record ConnectionParameters(EmbyConnection ActiveConnection)
+            if (result.IsRight)
+            {
+                parameters.MediaSource.LastCollectionsScan = DateTime.UtcNow;
+                await _mediaSourceRepository.UpdateLastScan(parameters.MediaSource);
+            }
+
+            return result;
+        }
+
+        return Unit.Default;
+    }
+
+    private record RequestParameters(
+        ConnectionParameters ConnectionParameters,
+        EmbyMediaSource MediaSource,
+        bool ForceScan,
+        int LibraryRefreshInterval);
+
+    private record ConnectionParameters(EmbyConnection ActiveConnection, EmbyMediaSource MediaSource)
     {
         public string? ApiKey { get; init; }
     }

ErsatzTV.Scanner/Application/Emby/Commands/SynchronizeEmbyLibraryByIdHandler.cs

@@ -88,22 +88,6 @@ public class SynchronizeEmbyLibraryByIdHandler : IRequestHandler<SynchronizeEmby
             {
                 parameters.Library.LastScan = DateTime.UtcNow;
                 await _libraryRepository.UpdateLastScan(parameters.Library);
-
-                // need to call get libraries to find library that contains collections (box sets)                
-                await _embyApiClient.GetLibraries(
-                    parameters.ConnectionParameters.ActiveConnection.Address,
-                    parameters.ConnectionParameters.ApiKey);
-
-                Either<BaseError, Unit> collectionResult = await _mediator.Send(
-                    new SynchronizeEmbyCollections(parameters.Library.MediaSourceId),
-                    cancellationToken);
-
-                collectionResult.BiIter(
-                    _ => _logger.LogDebug("Done synchronizing emby collections"),
-                    error => _logger.LogWarning(
-                        "Unable to synchronize emby collections for source {MediaSourceId}: {Error}",
-                        parameters.Library.MediaSourceId,
-                        error.Value));
             }
             
             foreach (BaseError error in result.LeftToSeq())

ErsatzTV.Scanner/Core/Emby/EmbyCollectionScanner.cs

@@ -30,6 +30,9 @@ public class EmbyCollectionScanner : IEmbyCollectionScanner
     {
         try
         {
+            // need to call get libraries to find library that contains collections (box sets)                
+            await _embyApiClient.GetLibraries(address, apiKey);
+            
             var incomingItemIds = new List<string>();
 
             // get all collections from db (item id, etag)

ErsatzTV.Scanner/Worker.cs

@@ -59,6 +59,7 @@ public class Worker : BackgroundService
         };
         
         var libraryIdArgument = new Argument<int>("library-id", "The library id to scan");
+        var mediaSourceIdArgument = new Argument<int>("media-source-id", "The media source id to scan");
         
         var scanLocalCommand = new Command("scan-local", "Scan a local library");
         scanLocalCommand.AddArgument(libraryIdArgument);
@@ -74,6 +75,10 @@ public class Worker : BackgroundService
         scanEmbyCommand.AddOption(forceOption);
         scanEmbyCommand.AddOption(deepOption);
 
+        var scanEmbyCollectionsCommand = new Command("scan-emby-collections", "Scan Emby collections");
+        scanEmbyCollectionsCommand.AddArgument(mediaSourceIdArgument);
+        scanEmbyCollectionsCommand.AddOption(forceOption);
+
         var scanJellyfinCommand = new Command("scan-jellyfin", "Scan a Jellyfin library");
         scanJellyfinCommand.AddArgument(libraryIdArgument);
         scanJellyfinCommand.AddOption(forceOption);
@@ -135,6 +140,24 @@ public class Worker : BackgroundService
                 }
             });
         
+        scanEmbyCollectionsCommand.SetHandler(
+            async context =>
+            {
+                if (IsScanningEnabled())
+                {
+                    bool force = context.ParseResult.GetValueForOption(forceOption);
+                    SetProcessPriority(force);
+
+                    int mediaSourceId = context.ParseResult.GetValueForArgument(mediaSourceIdArgument);
+
+                    using IServiceScope scope = _serviceScopeFactory.CreateScope();
+                    IMediator mediator = scope.ServiceProvider.GetRequiredService<IMediator>();
+
+                    var scan = new SynchronizeEmbyCollections(mediaSourceId, force);
+                    await mediator.Send(scan, context.GetCancellationToken());
+                }
+            });
+        
         scanJellyfinCommand.SetHandler(
             async context =>
             {
@@ -158,6 +181,7 @@ public class Worker : BackgroundService
         rootCommand.AddCommand(scanLocalCommand);
         rootCommand.AddCommand(scanPlexCommand);
         rootCommand.AddCommand(scanEmbyCommand);
+        rootCommand.AddCommand(scanEmbyCollectionsCommand);
         rootCommand.AddCommand(scanJellyfinCommand);
 
         return rootCommand;

ErsatzTV/Pages/Libraries.razor

@@ -83,15 +83,61 @@
     </MudTable>
 </MudContainer>
 
+@if (_externalCollections.Any())
+{
+    <MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8">
+        <MudTable Hover="true" Items="_externalCollections" Dense="true">
+            <ToolBarContent>
+                <MudText Typo="Typo.h6">External Collections</MudText>
+            </ToolBarContent>
+            <ColGroup>
+                <col/>
+                <col style="width: 180px;"/>
+            </ColGroup>
+            <HeaderContent>
+                <MudTh>Library Kind</MudTh>
+                <MudTh/>
+            </HeaderContent>
+            <RowTemplate>
+                <MudTd DataLabel="Library Kind">@context.LibraryKind</MudTd>
+                <MudTd>
+                    <div style="align-items: center; display: flex;">
+                        <div style="width: 48px"></div>
+                        @if (AreCollectionsLocked(context.LibraryKind))
+                        {
+                            <div style="align-items: center; display: flex; height: 48px; justify-content: center; width: 48px;">
+                                <MudProgressCircular Color="Color.Primary" Size="Size.Small" Indeterminate="true"/>
+                            </div>
+                        }
+                        else
+                        {
+                            <div style="width: 48px"></div>
+                            <MudTooltip Text="Scan Collections">
+                                <MudIconButton Icon="@Icons.Material.Filled.Refresh"
+                                               Disabled="@AreCollectionsLocked(context.LibraryKind)"
+                                               OnClick="@(_ => ScanExternalCollections(context))">
+                                </MudIconButton>
+                            </MudTooltip>
+                        }
+                        <div style="width: 48px"></div>
+                    </div>
+                </MudTd>
+            </RowTemplate>
+        </MudTable>
+    </MudContainer>
+}
+
 @code {
     private readonly CancellationTokenSource _cts = new();
 
     private IList<LibraryViewModel> _libraries;
+    private IList<LibraryViewModel> _externalCollections;
     private Dictionary<int, int> _progressByLibrary;
 
     protected override void OnInitialized()
     {
         _locker.OnLibraryChanged += LockChanged;
+        _locker.OnEmbyCollectionsChanged += LockChanged;
         _courier.Subscribe<LibraryScanProgress>(HandleScanProgress);
     }
 
@@ -100,6 +146,7 @@
     private async Task LoadLibraries(CancellationToken cancellationToken)
     {
         _libraries = await _mediator.Send(new GetConfiguredLibraries(), cancellationToken);
+        _externalCollections = await _mediator.Send(new GetExternalCollections(), cancellationToken);
         _progressByLibrary = _libraries.ToDictionary(vm => vm.Id, _ => 0);
     }
 
@@ -129,9 +176,33 @@
         }
     }
 
+    private async Task ScanExternalCollections(LibraryViewModel library)
+    {
+        switch (library.LibraryKind.ToLowerInvariant())
+        {
+            case "emby":
+                if (_locker.LockEmbyCollections())
+                {
+                    await _scannerWorkerChannel.WriteAsync(new SynchronizeEmbyCollections(library.MediaSourceId, true));
+                }
+                break;
+        }
+    }
+
     private void LockChanged(object sender, EventArgs e) =>
         InvokeAsync(StateHasChanged);
 
+    private bool AreCollectionsLocked(string libraryKind)
+    {
+        switch (libraryKind.ToLowerInvariant())
+        {
+            case "emby":
+                return _locker.AreEmbyCollectionsLocked();
+        }
+        
+        return false;
+    }
+
     private async Task HandleScanProgress(LibraryScanProgress libraryScanProgress, CancellationToken cancellationToken)
     {
         try
@@ -151,6 +222,7 @@
     void IDisposable.Dispose()
     {
         _locker.OnLibraryChanged -= LockChanged;
+        _locker.OnEmbyCollectionsChanged -= LockChanged;
         _courier.UnSubscribe<LibraryScanProgress>(HandleScanProgress);
 
         _cts.Cancel();

ErsatzTV/Services/ScannerService.cs

@@ -59,6 +59,9 @@ public class ScannerService : BackgroundService
                         case ISynchronizeEmbyLibraryById synchronizeEmbyLibraryById:
                             requestTask = SynchronizeEmbyLibrary(synchronizeEmbyLibraryById, cancellationToken);
                             break;
+                        case SynchronizeEmbyCollections synchronizeEmbyCollections:
+                            requestTask = SynchronizeEmbyCollections(synchronizeEmbyCollections, cancellationToken);
+                            break;
                         case IScanLocalLibrary scanLocalLibrary:
                             requestTask = SynchronizeLocalLibrary(scanLocalLibrary, cancellationToken);
                             break;
@@ -274,5 +277,34 @@ public class ScannerService : BackgroundService
             entityLocker.UnlockLibrary(request.EmbyLibraryId);
         }
     }
+
+    private async Task SynchronizeEmbyCollections(
+        SynchronizeEmbyCollections request,
+        CancellationToken cancellationToken)
+    {
+        using IServiceScope scope = _serviceScopeFactory.CreateScope();
+        IMediator mediator = scope.ServiceProvider.GetRequiredService<IMediator>();
+        IEntityLocker entityLocker = scope.ServiceProvider.GetRequiredService<IEntityLocker>();
+
+        Either<BaseError, Unit> result = await mediator.Send(request, cancellationToken);
+        result.BiIter(
+            _ => _logger.LogDebug("Done synchronizing emby collections"),
+            error =>
+            {
+                if (error is ScanIsNotRequired)
+                {
+                    _logger.LogDebug("Scan is not required for emby collections at this time");
+                }
+                else
+                {
+                    _logger.LogWarning("Unable to synchronize emby collections: {Error}", error.Value);
+                }
+            });
+        
+        if (entityLocker.AreEmbyCollectionsLocked())
+        {
+            entityLocker.UnlockEmbyCollections();
+        }
+    }
 }
 

ErsatzTV/Services/SchedulerService.cs

@@ -236,8 +236,12 @@ public class SchedulerService : BackgroundService
         using IServiceScope scope = _serviceScopeFactory.CreateScope();
         TvContext dbContext = scope.ServiceProvider.GetRequiredService<TvContext>();
 
+        var mediaSourceIds = new System.Collections.Generic.HashSet<int>();
+        
         foreach (EmbyLibrary library in dbContext.EmbyLibraries.Filter(l => l.ShouldSyncItems))
         {
+            mediaSourceIds.Add(library.MediaSourceId);
+            
             if (_entityLocker.LockLibrary(library.Id))
             {
                 await _scannerWorkerChannel.WriteAsync(
@@ -245,6 +249,13 @@ public class SchedulerService : BackgroundService
                     cancellationToken);
             }
         }
+
+        foreach (int mediaSourceId in mediaSourceIds)
+        {
+            await _scannerWorkerChannel.WriteAsync(
+                new SynchronizeEmbyCollections(mediaSourceId, false),
+                cancellationToken);
+        }
     }
 
     private async Task MatchTraktLists(CancellationToken cancellationToken)