show database and search index initialization in ui (#1325)

* unblock startup, show database initialization message

* wait on search index to be ready (rebuild)

* clean logging and fake delay

CHANGELOG.md

@@ -8,6 +8,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Only allow a single instance of ErsatzTV to run
   - This fixes some cases where the search index would become unusable
 
+### Changed
+- Rework startup process to show UI as early as possible
+  - A minimal UI will indicate when the database and search index are initializing
+  - The UI will automatically refresh when the initialization processes have completed
+
+
 ## [0.8.0-beta] - 2023-06-23
 ### Added
 - Disable playout buttons and show spinning indicator when a playout is being modified (built/extended, or subtitles are being extracted)

ErsatzTV.Application/Search/Commands/RebuildSearchIndexHandler.cs

@@ -14,6 +14,7 @@ public class RebuildSearchIndexHandler : IRequestHandler<RebuildSearchIndex>
 {
     private readonly IConfigElementRepository _configElementRepository;
     private readonly IFallbackMetadataProvider _fallbackMetadataProvider;
+    private readonly SystemStartup _systemStartup;
     private readonly ILocalFileSystem _localFileSystem;
     private readonly ILogger<RebuildSearchIndexHandler> _logger;
     private readonly ISearchIndex _searchIndex;
@@ -25,6 +26,7 @@ public class RebuildSearchIndexHandler : IRequestHandler<RebuildSearchIndex>
         IConfigElementRepository configElementRepository,
         ILocalFileSystem localFileSystem,
         IFallbackMetadataProvider fallbackMetadataProvider,
+        SystemStartup systemStartup,
         ILogger<RebuildSearchIndexHandler> logger)
     {
         _searchIndex = searchIndex;
@@ -33,6 +35,7 @@ public class RebuildSearchIndexHandler : IRequestHandler<RebuildSearchIndex>
         _configElementRepository = configElementRepository;
         _localFileSystem = localFileSystem;
         _fallbackMetadataProvider = fallbackMetadataProvider;
+        _systemStartup = systemStartup;
     }
 
     public async Task Handle(RebuildSearchIndex request, CancellationToken cancellationToken)
@@ -63,5 +66,7 @@ public class RebuildSearchIndexHandler : IRequestHandler<RebuildSearchIndex>
         {
             _logger.LogInformation("Search index is already version {Version}", _searchIndex.Version);
         }
+        
+        _systemStartup.SearchIndexIsReady();
     }
 }

ErsatzTV.Core/SystemStartup.cs

@@ -0,0 +1,33 @@
+namespace ErsatzTV.Core;
+
+public class SystemStartup
+{
+    private readonly SemaphoreSlim _databaseStartup = new(0, 100);
+    private readonly SemaphoreSlim _searchIndexStartup = new(0, 100);
+
+    public event EventHandler OnDatabaseReady;
+    public event EventHandler OnSearchIndexReady;
+    
+    public bool IsDatabaseReady { get; private set; }
+    public bool IsSearchIndexReady { get; private set; }
+
+    public async Task WaitForDatabase(CancellationToken cancellationToken) =>
+        await _databaseStartup.WaitAsync(cancellationToken);
+    
+    public async Task WaitForSearchIndex(CancellationToken cancellationToken) =>
+        await _searchIndexStartup.WaitAsync(cancellationToken);
+
+    public void DatabaseIsReady()
+    {
+        _databaseStartup.Release(100);
+        IsDatabaseReady = true;
+        OnDatabaseReady?.Invoke(this, EventArgs.Empty);
+    }
+    
+    public void SearchIndexIsReady()
+    {
+        _searchIndexStartup.Release(100);
+        IsSearchIndexReady = true;
+        OnSearchIndexReady?.Invoke(this, EventArgs.Empty);
+    }
+}

ErsatzTV/Pages/Index.razor

@@ -5,11 +5,48 @@
 @using ErsatzTV.Core.Interfaces.GitHub
 @using ErsatzTV.Application.Health
 @implements IDisposable
-@inject IGitHubApiClient _gitHubApiClient
+@inject IGitHubApiClient GitHubApiClient
-@inject IMemoryCache _memoryCache
+@inject IMemoryCache MemoryCache
-@inject IMediator _mediator
+@inject IMediator Mediator
+@inject SystemStartup SystemStartup;
 
 <MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8">
+    @if (!SystemStartup.IsDatabaseReady)
+    {
+        <MudCard>
+            <MudCardHeader>
+                <CardHeaderContent>
+                    <MudText Typo="Typo.h4">Database is initializing</MudText>
+                </CardHeaderContent>
+            </MudCardHeader>
+            <MudCardContent>
+                <MudText>Please wait, this may take a few minutes.</MudText>
+                <MudText>This page will automatically refresh when the database is ready.</MudText>
+            </MudCardContent>
+            <MudCardActions>
+                <MudProgressCircular Color="Color.Primary" Size="Size.Medium" Indeterminate="true"/>
+            </MudCardActions>
+        </MudCard>
+    }
+    else if (!SystemStartup.IsSearchIndexReady)
+    {
+        <MudCard>
+            <MudCardHeader>
+                <CardHeaderContent>
+                    <MudText Typo="Typo.h4">Search Index is initializing</MudText>
+                </CardHeaderContent>
+            </MudCardHeader>
+            <MudCardContent>
+                <MudText>Please wait, this may take a few minutes.</MudText>
+                <MudText>This page will automatically refresh when the search index is ready.</MudText>
+            </MudCardContent>
+            <MudCardActions>
+                <MudProgressCircular Color="Color.Primary" Size="Size.Medium" Indeterminate="true"/>
+            </MudCardActions>
+        </MudCard>
+    }
+    else
+    {
         <MudCard>
             <MudCardContent Class="release-notes mud-typography mud-typography-body1">
                 <MarkdownView Content="@_releaseNotes"/>
@@ -68,7 +105,7 @@
                     }
                 </MudTd>
             </RowTemplate>
-    </MudTable>
+        </MudTable>    }
 </MudContainer>
 
 @code {
@@ -77,17 +114,31 @@
     private string _releaseNotes;
     private MudTable<HealthCheckResult> _table;
 
+    protected override void OnInitialized()
+    {
+        SystemStartup.OnDatabaseReady += OnStartupProgress;
+        SystemStartup.OnSearchIndexReady += OnStartupProgress;
+    }
+
     public void Dispose()
     {
+        SystemStartup.OnDatabaseReady -= OnStartupProgress;
+        SystemStartup.OnSearchIndexReady -= OnStartupProgress;
+
         _cts.Cancel();
         _cts.Dispose();
     }
     
+    private async void OnStartupProgress(object sender, EventArgs e)
+    {
+        await InvokeAsync(StateHasChanged);
+    }
+
     protected override async Task OnParametersSetAsync()
     {
         try
         {
-            if (_memoryCache.TryGetValue("Index.ReleaseNotesHtml", out string releaseNotesHtml))
+            if (MemoryCache.TryGetValue("Index.ReleaseNotesHtml", out string releaseNotesHtml))
             {
                 _releaseNotes = releaseNotesHtml;
             }
@@ -109,20 +160,26 @@
                                 gitHubVersion = $"v{gitHubVersion}";
                             }
 
-                            maybeNotes = await _gitHubApiClient.GetReleaseNotes(gitHubVersion, _cts.Token);
+                            maybeNotes = await GitHubApiClient.GetReleaseNotes(gitHubVersion, _cts.Token);
-                            maybeNotes.IfRight(notes => _releaseNotes = notes);
+                            foreach (string notes in maybeNotes.RightToSeq())
+                            {
+                                _releaseNotes = notes;
+                            }
                         }
                         else
                         {
-                            maybeNotes = await _gitHubApiClient.GetLatestReleaseNotes(_cts.Token);
+                            maybeNotes = await GitHubApiClient.GetLatestReleaseNotes(_cts.Token);
-                            maybeNotes.IfRight(notes => _releaseNotes = notes);
+                            foreach (string notes in maybeNotes.RightToSeq())
+                            {
+                                _releaseNotes = notes;
+                            }
                         }
                     }
                 }
 
                 if (_releaseNotes != null)
                 {
-                    _memoryCache.Set("Index.ReleaseNotesHtml", _releaseNotes);
+                    MemoryCache.Set("Index.ReleaseNotesHtml", _releaseNotes);
                 }
             }
         }
@@ -134,7 +191,7 @@
 
     private async Task<TableData<HealthCheckResult>> ServerReload(TableState state)
     {
-        List<HealthCheckResult> healthCheckResults = await _mediator.Send(new GetAllHealthCheckResults(), _cts.Token);
+        List<HealthCheckResult> healthCheckResults = await Mediator.Send(new GetAllHealthCheckResults(), _cts.Token);
 
         return new TableData<HealthCheckResult>
         {

ErsatzTV/Services/EmbyService.cs

@@ -13,19 +13,30 @@ public class EmbyService : BackgroundService
     private readonly ChannelReader<IEmbyBackgroundServiceRequest> _channel;
     private readonly ILogger<EmbyService> _logger;
     private readonly IServiceScopeFactory _serviceScopeFactory;
+    private readonly SystemStartup _systemStartup;
 
     public EmbyService(
         ChannelReader<IEmbyBackgroundServiceRequest> channel,
         IServiceScopeFactory serviceScopeFactory,
+        SystemStartup systemStartup,
         ILogger<EmbyService> logger)
     {
         _channel = channel;
         _serviceScopeFactory = serviceScopeFactory;
+        _systemStartup = systemStartup;
         _logger = logger;
     }
 
     protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
+        await Task.Yield();
+        
+        await _systemStartup.WaitForDatabase(cancellationToken);
+        if (cancellationToken.IsCancellationRequested)
+        {
+            return;
+        }
+
         try
         {
             if (!File.Exists(FileSystemLayout.EmbySecretsPath))

ErsatzTV/Services/FFmpegLocatorService.cs

@@ -1,23 +1,35 @@
-using ErsatzTV.Core.Domain;
+using ErsatzTV.Core;
+using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.FFmpeg;
 
 namespace ErsatzTV.Services;
 
-public class FFmpegLocatorService : IHostedService
+public class FFmpegLocatorService : BackgroundService
 {
     private readonly ILogger<FFmpegLocatorService> _logger;
     private readonly IServiceScopeFactory _serviceScopeFactory;
+    private readonly SystemStartup _systemStartup;
 
     public FFmpegLocatorService(
         IServiceScopeFactory serviceScopeFactory,
+        SystemStartup systemStartup,
         ILogger<FFmpegLocatorService> logger)
     {
         _serviceScopeFactory = serviceScopeFactory;
+        _systemStartup = systemStartup;
         _logger = logger;
     }
 
-    public async Task StartAsync(CancellationToken cancellationToken)
+    protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
+        await Task.Yield();
+
+        await _systemStartup.WaitForDatabase(cancellationToken);
+        if (cancellationToken.IsCancellationRequested)
+        {
+            return;
+        }
+
         using IServiceScope scope = _serviceScopeFactory.CreateScope();
         IFFmpegLocator ffmpegLocator = scope.ServiceProvider.GetRequiredService<IFFmpegLocator>();
 
@@ -34,6 +46,4 @@ public class FFmpegLocatorService : IHostedService
             path => _logger.LogInformation("Located ffprobe at {Path}", path),
             () => _logger.LogWarning("Failed to locate ffprobe executable"));
     }
-
-    public Task StopAsync(CancellationToken cancellationToken) => Task.CompletedTask;
 }

ErsatzTV/Services/FFmpegWorkerService.cs

@@ -27,6 +27,8 @@ public class FFmpegWorkerService : BackgroundService
 
     protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
+        await Task.Yield();
+        
         try
         {
             _logger.LogInformation("FFmpeg worker service started");

ErsatzTV/Services/JellyfinService.cs

@@ -13,19 +13,30 @@ public class JellyfinService : BackgroundService
     private readonly ChannelReader<IJellyfinBackgroundServiceRequest> _channel;
     private readonly ILogger<JellyfinService> _logger;
     private readonly IServiceScopeFactory _serviceScopeFactory;
+    private readonly SystemStartup _systemStartup;
 
     public JellyfinService(
         ChannelReader<IJellyfinBackgroundServiceRequest> channel,
         IServiceScopeFactory serviceScopeFactory,
+        SystemStartup systemStartup,
         ILogger<JellyfinService> logger)
     {
         _channel = channel;
         _serviceScopeFactory = serviceScopeFactory;
+        _systemStartup = systemStartup;
         _logger = logger;
     }
 
     protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
+        await Task.Yield();
+
+        await _systemStartup.WaitForDatabase(cancellationToken);
+        if (cancellationToken.IsCancellationRequested)
+        {
+            return;
+        }
+
         try
         {
             if (!File.Exists(FileSystemLayout.JellyfinSecretsPath))

ErsatzTV/Services/PlexService.cs

@@ -13,19 +13,30 @@ public class PlexService : BackgroundService
     private readonly ChannelReader<IPlexBackgroundServiceRequest> _channel;
     private readonly ILogger<PlexService> _logger;
     private readonly IServiceScopeFactory _serviceScopeFactory;
+    private readonly SystemStartup _systemStartup;
 
     public PlexService(
         ChannelReader<IPlexBackgroundServiceRequest> channel,
         IServiceScopeFactory serviceScopeFactory,
+        SystemStartup systemStartup,
         ILogger<PlexService> logger)
     {
         _channel = channel;
         _serviceScopeFactory = serviceScopeFactory;
+        _systemStartup = systemStartup;
         _logger = logger;
     }
 
     protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
+        await Task.Yield();
+
+        await _systemStartup.WaitForDatabase(cancellationToken);
+        if (cancellationToken.IsCancellationRequested)
+        {
+            return;
+        }
+
         try
         {
             if (!File.Exists(FileSystemLayout.PlexSecretsPath))

ErsatzTV/Services/RunOnce/CacheCleanerService.cs

@@ -6,21 +6,32 @@ using Microsoft.EntityFrameworkCore;
 
 namespace ErsatzTV.Services.RunOnce;
 
-public class CacheCleanerService : IHostedService
+public class CacheCleanerService : BackgroundService
 {
     private readonly ILogger<CacheCleanerService> _logger;
     private readonly IServiceScopeFactory _serviceScopeFactory;
+    private readonly SystemStartup _systemStartup;
 
     public CacheCleanerService(
         IServiceScopeFactory serviceScopeFactory,
+        SystemStartup systemStartup,
         ILogger<CacheCleanerService> logger)
     {
         _serviceScopeFactory = serviceScopeFactory;
+        _systemStartup = systemStartup;
         _logger = logger;
     }
 
-    public async Task StartAsync(CancellationToken cancellationToken)
+    protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
+        await Task.Yield();
+
+        await _systemStartup.WaitForDatabase(cancellationToken);
+        if (cancellationToken.IsCancellationRequested)
+        {
+            return;
+        }
+        
         using IServiceScope scope = _serviceScopeFactory.CreateScope();
         await using TvContext dbContext = scope.ServiceProvider.GetRequiredService<TvContext>();
         ILocalFileSystem localFileSystem = scope.ServiceProvider.GetRequiredService<ILocalFileSystem>();
@@ -57,6 +68,4 @@ public class CacheCleanerService : IHostedService
             _logger.LogInformation("Done emptying transcode cache folder");
         }
     }
-
-    public Task StopAsync(CancellationToken cancellationToken) => Task.CompletedTask;
 }

ErsatzTV/Services/RunOnce/DatabaseMigratorService.cs

@@ -1,23 +1,29 @@
-using ErsatzTV.Infrastructure.Data;
+using ErsatzTV.Core;
+using ErsatzTV.Infrastructure.Data;
 using Microsoft.EntityFrameworkCore;
 
 namespace ErsatzTV.Services.RunOnce;
 
-public class DatabaseMigratorService : IHostedService
+public class DatabaseMigratorService : BackgroundService
 {
     private readonly ILogger<DatabaseMigratorService> _logger;
     private readonly IServiceScopeFactory _serviceScopeFactory;
+    private readonly SystemStartup _systemStartup;
 
     public DatabaseMigratorService(
         IServiceScopeFactory serviceScopeFactory,
+        SystemStartup systemStartup,
         ILogger<DatabaseMigratorService> logger)
     {
         _serviceScopeFactory = serviceScopeFactory;
+        _systemStartup = systemStartup;
         _logger = logger;
     }
 
-    public async Task StartAsync(CancellationToken cancellationToken)
+    protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
+        await Task.Yield();
+        
         _logger.LogInformation("Applying database migrations");
 
         using IServiceScope scope = _serviceScopeFactory.CreateScope();
@@ -25,8 +31,8 @@ public class DatabaseMigratorService : IHostedService
         await dbContext.Database.MigrateAsync(cancellationToken);
         await DbInitializer.Initialize(dbContext, cancellationToken);
 
+        _systemStartup.DatabaseIsReady();
+
         _logger.LogInformation("Done applying database migrations");
     }
-
-    public Task StopAsync(CancellationToken cancellationToken) => Task.CompletedTask;
 }

ErsatzTV/Services/RunOnce/EndpointValidatorService.cs

@@ -4,7 +4,7 @@ using ErsatzTV.Core;
 
 namespace ErsatzTV.Services.RunOnce;
 
-public class EndpointValidatorService : IHostedService
+public class EndpointValidatorService : BackgroundService
 {
     private readonly IConfiguration _configuration;
     private readonly ILogger<EndpointValidatorService> _logger;
@@ -15,8 +15,10 @@ public class EndpointValidatorService : IHostedService
         _logger = logger;
     }
 
-    public Task StartAsync(CancellationToken cancellationToken)
+    protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
+        await Task.Yield();
+
         string urls = _configuration.GetValue<string>("Kestrel:Endpoints:Http:Url");
         if (urls.Split(";").Length > 1)
         {
@@ -50,9 +52,5 @@ public class EndpointValidatorService : IHostedService
             "Server will listen on port {Port} - try UI at {UI}",
             Settings.ListenPort,
             $"http://localhost:{Settings.ListenPort}{baseUrl}");
-
-        return Task.CompletedTask;
     }
-
-    public Task StopAsync(CancellationToken cancellationToken) => Task.CompletedTask;
 }

ErsatzTV/Services/RunOnce/LoadLoggingLevelService.cs

@@ -1,3 +1,4 @@
+using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Repositories;
 using Serilog.Core;
@@ -5,15 +6,27 @@ using Serilog.Events;
 
 namespace ErsatzTV.Services.RunOnce;
 
-public class LoadLoggingLevelService : IHostedService
+public class LoadLoggingLevelService : BackgroundService
 {
     private readonly IServiceScopeFactory _serviceScopeFactory;
+    private readonly SystemStartup _systemStartup;
 
-    public LoadLoggingLevelService(IServiceScopeFactory serviceScopeFactory) =>
+    public LoadLoggingLevelService(IServiceScopeFactory serviceScopeFactory, SystemStartup systemStartup)
+    {
         _serviceScopeFactory = serviceScopeFactory;
+        _systemStartup = systemStartup;
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken cancellationToken)
+    {
+        await Task.Yield();
 
-    public async Task StartAsync(CancellationToken cancellationToken)
+        await _systemStartup.WaitForDatabase(cancellationToken);
+        if (cancellationToken.IsCancellationRequested)
         {
+            return;
+        }
+
         using IServiceScope scope = _serviceScopeFactory.CreateScope();
         IConfigElementRepository configElementRepository =
             scope.ServiceProvider.GetRequiredService<IConfigElementRepository>();
@@ -26,6 +39,4 @@ public class LoadLoggingLevelService : IHostedService
             loggingLevelSwitch.MinimumLevel = logLevel;
         }
     }
-
-    public Task StopAsync(CancellationToken cancellationToken) => Task.CompletedTask;
 }

ErsatzTV/Services/RunOnce/PlatformSettingsService.cs

@@ -1,12 +1,11 @@
 using System.Runtime.InteropServices;
 using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.FFmpeg.Runtime;
-using ErsatzTV.Infrastructure.Data;
 using Microsoft.Extensions.Caching.Memory;
 
 namespace ErsatzTV.Services.RunOnce;
 
-public class PlatformSettingsService : IHostedService
+public class PlatformSettingsService : BackgroundService
 {
     private readonly ILogger<PlatformSettingsService> _logger;
     private readonly IServiceScopeFactory _serviceScopeFactory;
@@ -19,11 +18,11 @@ public class PlatformSettingsService : IHostedService
         _logger = logger;
     }
 
-    public async Task StartAsync(CancellationToken cancellationToken)
+    protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
-        using IServiceScope scope = _serviceScopeFactory.CreateScope();
+        await Task.Yield();
-        await using TvContext dbContext = scope.ServiceProvider.GetRequiredService<TvContext>();
 
+        using IServiceScope scope = _serviceScopeFactory.CreateScope();
         IRuntimeInfo runtimeInfo = scope.ServiceProvider.GetRequiredService<IRuntimeInfo>();
         if (runtimeInfo != null && runtimeInfo.IsOSPlatform(OSPlatform.Linux) &&
             Directory.Exists("/dev/dri"))
@@ -38,6 +37,4 @@ public class PlatformSettingsService : IHostedService
             memoryCache.Set("ffmpeg.render_devices", devices);
         }
     }
-
-    public Task StopAsync(CancellationToken cancellationToken) => Task.CompletedTask;
 }

ErsatzTV/Services/RunOnce/RebuildSearchIndexService.cs

@@ -1,21 +1,32 @@
 using ErsatzTV.Application.Search;
+using ErsatzTV.Core;
 using MediatR;
 
 namespace ErsatzTV.Services.RunOnce;
 
-public class RebuildSearchIndexService : IHostedService
+public class RebuildSearchIndexService : BackgroundService
 {
     private readonly IServiceScopeFactory _serviceScopeFactory;
+    private readonly SystemStartup _systemStartup;
 
-    public RebuildSearchIndexService(IServiceScopeFactory serviceScopeFactory) =>
+    public RebuildSearchIndexService(IServiceScopeFactory serviceScopeFactory, SystemStartup systemStartup)
+    {
         _serviceScopeFactory = serviceScopeFactory;
+        _systemStartup = systemStartup;
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken cancellationToken)
+    {
+        await Task.Yield();
 
-    public async Task StartAsync(CancellationToken cancellationToken)
+        await _systemStartup.WaitForDatabase(cancellationToken);
+        if (cancellationToken.IsCancellationRequested)
         {
+            return;
+        }
+
         using IServiceScope scope = _serviceScopeFactory.CreateScope();
         IMediator mediator = scope.ServiceProvider.GetRequiredService<IMediator>();
         await mediator.Send(new RebuildSearchIndex(), cancellationToken);
     }
-
-    public Task StopAsync(CancellationToken cancellationToken) => Task.CompletedTask;
 }

ErsatzTV/Services/RunOnce/ResourceExtractorService.cs

@@ -3,10 +3,12 @@ using ErsatzTV.Core;
 
 namespace ErsatzTV.Services.RunOnce;
 
-public class ResourceExtractorService : IHostedService
+public class ResourceExtractorService : BackgroundService
 {
-    public async Task StartAsync(CancellationToken cancellationToken)
+    protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
+        await Task.Yield();
+
         if (!Directory.Exists(FileSystemLayout.ResourcesCacheFolder))
         {
             Directory.CreateDirectory(FileSystemLayout.ResourcesCacheFolder);
@@ -60,8 +62,6 @@ public class ResourceExtractorService : IHostedService
             cancellationToken);
     }
 
-    public Task StopAsync(CancellationToken cancellationToken) => Task.CompletedTask;
-
     private static async Task ExtractResource(Assembly assembly, string name, CancellationToken cancellationToken)
     {
         await using Stream resource = assembly.GetManifestResourceStream($"ErsatzTV.Resources.{name}");

ErsatzTV/Services/ScannerService.cs

@@ -30,6 +30,8 @@ public class ScannerService : BackgroundService
 
     protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
+        await Task.Yield();
+        
         try
         {
             _logger.LogInformation("Scanner service started");

ErsatzTV/Services/SchedulerService.cs

@@ -9,6 +9,7 @@ using ErsatzTV.Application.MediaCollections;
 using ErsatzTV.Application.MediaSources;
 using ErsatzTV.Application.Playouts;
 using ErsatzTV.Application.Plex;
+using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Locking;
 using ErsatzTV.Core.Scheduling;
@@ -20,6 +21,7 @@ namespace ErsatzTV.Services;
 public class SchedulerService : BackgroundService
 {
     private readonly IEntityLocker _entityLocker;
+    private readonly SystemStartup _systemStartup;
     private readonly ILogger<SchedulerService> _logger;
     private readonly ChannelWriter<IScannerBackgroundServiceRequest> _scannerWorkerChannel;
     private readonly IServiceScopeFactory _serviceScopeFactory;
@@ -30,17 +32,31 @@ public class SchedulerService : BackgroundService
         ChannelWriter<IBackgroundServiceRequest> workerChannel,
         ChannelWriter<IScannerBackgroundServiceRequest> scannerWorkerChannel,
         IEntityLocker entityLocker,
+        SystemStartup systemStartup,
         ILogger<SchedulerService> logger)
     {
         _serviceScopeFactory = serviceScopeFactory;
         _workerChannel = workerChannel;
         _scannerWorkerChannel = scannerWorkerChannel;
         _entityLocker = entityLocker;
+        _systemStartup = systemStartup;
         _logger = logger;
     }
 
     protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
+        await Task.Yield();
+        
+        await _systemStartup.WaitForSearchIndex(cancellationToken);
+        if (cancellationToken.IsCancellationRequested)
+        {
+            return;
+        }
+
+        try
+        {
+            _logger.LogInformation("Scheduler service started");
+
             DateTime firstRun = DateTime.Now;
 
             // run once immediately at startup
@@ -86,6 +102,11 @@ public class SchedulerService : BackgroundService
                 }
             }
         }
+        catch (Exception ex) when (ex is TaskCanceledException or OperationCanceledException)
+        {
+            _logger.LogInformation("Scheduler service shutting down");
+        }
+    }
 
     private async Task DoWork(CancellationToken cancellationToken)
     {

ErsatzTV/Services/SearchIndexService.cs

@@ -24,6 +24,8 @@ public class SearchIndexService : BackgroundService
 
     protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
+        await Task.Yield();
+        
         try
         {
             _logger.LogInformation("Search index worker service started");

ErsatzTV/Services/WorkerService.cs

@@ -29,6 +29,8 @@ public class WorkerService : BackgroundService
 
     protected override async Task ExecuteAsync(CancellationToken cancellationToken)
     {
+        await Task.Yield();
+        
         try
         {
             _logger.LogInformation("Worker service started");

ErsatzTV/Shared/MainLayout.razor

@@ -5,6 +5,7 @@
 @implements IDisposable
 @inject NavigationManager NavigationManager
 @inject IMediator Mediator
+@inject SystemStartup SystemStartup
 
 <MudThemeProvider Theme="_ersatzTvTheme"/>
 <MudDialogProvider DisableBackdropClick="true"/>
@@ -17,6 +18,8 @@
                 <img src="images/ersatztv.png" alt="ErsatzTV"/>
             </a>
         </div>
+        @if (SystemStartup.IsDatabaseReady && SystemStartup.IsSearchIndexReady)
+        {
             <div class="search-form">
                 <EditForm Model="@_dummyModel" OnSubmit="@(_ => PerformSearch())">
                     <MudTextField T="string"
@@ -62,9 +65,13 @@
                     </MudPopover>
                 </EditForm>
             </div>
+        }
         <MudSpacer/>
+        @if (SystemStartup.IsDatabaseReady && SystemStartup.IsSearchIndexReady)
+        {
             <MudLink Color="Color.Info" Href="iptv/channels.m3u" Target="_blank" Underline="Underline.None">M3U</MudLink>
             <MudLink Color="Color.Info" Href="iptv/xmltv.xml" Target="_blank" Class="mx-4" Underline="Underline.None">XMLTV</MudLink>
+        }
         @* <MudLink Color="Color.Info" Href="/swagger" Target="_blank" Class="mr-4" Underline="Underline.None">API</MudLink> *@
         <MudTooltip Text="Documentation">
             <MudIconButton Icon="@Icons.Material.Filled.Help" Color="Color.Primary" Link="https://ersatztv.org" Target="_blank"/>
@@ -83,6 +90,8 @@
             </form>
         </AuthorizeView>
     </MudAppBar>
+    @if (SystemStartup.IsDatabaseReady && SystemStartup.IsSearchIndexReady)
+    {
         <MudDrawer Open="true" Elevation="2" ClipMode="DrawerClipMode.Always">
             <MudNavMenu>
                 <MudNavLink Href="channels">Channels</MudNavLink>
@@ -122,6 +131,7 @@
                 </MudContainer>
             </MudNavMenu>
         </MudDrawer>
+    }
     <MudMainContent>
         @Body
     </MudMainContent>
@@ -140,8 +150,17 @@
     private bool _isOpen;
     private List<SearchTargetViewModel> _searchTargets;
 
+    protected override void OnInitialized()
+    {
+        SystemStartup.OnDatabaseReady += OnStartupProgress;
+        SystemStartup.OnSearchIndexReady += OnStartupProgress;
+    }
+
     public void Dispose()
     {
+        SystemStartup.OnDatabaseReady -= OnStartupProgress;
+        SystemStartup.OnSearchIndexReady -= OnStartupProgress;
+
         _cts.Cancel();
         _cts.Dispose();
     }
@@ -185,12 +204,17 @@
         }
     }
 
+    private async void OnStartupProgress(object sender, EventArgs e)
+    {
+        await InvokeAsync(StateHasChanged);
+    }
+
     protected override async Task OnParametersSetAsync()
     {
         await base.OnParametersSetAsync();
         _query = NavigationManager.Uri.GetSearchQuery();
 
-        if (_searchTargets is null)
+        if (SystemStartup.IsDatabaseReady && _searchTargets is null)
         {
             _searchTargets = await Mediator.Send(new QuerySearchTargets(), _cts.Token);
         }

ErsatzTV/Startup.cs

@@ -521,6 +521,7 @@ public class Startup
         services.AddSingleton<ITempFilePool, TempFilePool>();
         services.AddSingleton<IHlsPlaylistFilter, HlsPlaylistFilter>();
         services.AddSingleton<RecyclableMemoryStreamManager>();
+        services.AddSingleton<SystemStartup>();
         AddChannel<IBackgroundServiceRequest>(services);
         AddChannel<IPlexBackgroundServiceRequest>(services);
         AddChannel<IJellyfinBackgroundServiceRequest>(services);