properly flag local missing folders (#615)

CHANGELOG.md

@@ -7,6 +7,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Fixed
 - Normalize smart quotes in search queries as they are unsupported by the search library
 - Fix incorrect watermark time calculations caused by working ahead in `HLS Segmenter`
+- Fix ui crash adding empty path to local library
+- Properly flag items as `File Not Found` when local library path (folder) is missing from disk
 
 ### Added
 - Include `Series` category tag for all episodes in XMLTV

ErsatzTV.Core.Tests/Metadata/MovieFolderScannerTests.cs

@@ -81,24 +81,6 @@ namespace ErsatzTV.Core.Tests.Metadata
             private Mock<ILocalMetadataProvider> _localMetadataProvider;
             private Mock<IImageCache> _imageCache;
 
-            [Test]
-            public async Task Missing_Folder()
-            {
-                MovieFolderScanner service = GetService(
-                    new FakeFileEntry(Path.Combine(FakeRoot, Path.Combine("Movie (2020)", "Movie (2020).mkv")))
-                );
-                var libraryPath = new LibraryPath { Path = BadFakeRoot, LibraryFolders = new List<LibraryFolder>() };
-
-                Either<BaseError, Unit> result = await service.ScanFolder(
-                    libraryPath,
-                    FFprobePath,
-                    0,
-                    1);
-
-                result.IsLeft.Should().BeTrue();
-                result.IfLeft(error => error.Should().BeOfType<MediaSourceInaccessible>());
-            }
-
             [Test]
             public async Task NewMovie_Statistics_And_FallbackMetadata(
                 [ValueSource(typeof(LocalFolderScanner), nameof(LocalFolderScanner.VideoFileExtensions))]

ErsatzTV.Core/Errors/MediaSourceInaccessible.cs

@@ -1,10 +0,0 @@
-namespace ErsatzTV.Core.Errors
-{
-    public class MediaSourceInaccessible : BaseError
-    {
-        public MediaSourceInaccessible()
-            : base("Media source is not accessible or missing")
-        {
-        }
-    }
-}

ErsatzTV.Core/Metadata/LocalFileSystem.cs

@@ -23,7 +23,7 @@ namespace ErsatzTV.Core.Metadata
         {
             try
             {
-                if (!Directory.Exists(folder))
+                if (folder != null && !Directory.Exists(folder))
                 {
                     Directory.CreateDirectory(folder);
                 }
@@ -42,11 +42,39 @@ namespace ErsatzTV.Core.Metadata
         public bool IsLibraryPathAccessible(LibraryPath libraryPath) =>
             Directory.Exists(libraryPath.Path);
 
-        public IEnumerable<string> ListSubdirectories(string folder) =>
+        public IEnumerable<string> ListSubdirectories(string folder)
-            Try(Directory.EnumerateDirectories(folder)).IfFail(new List<string>());
+        {
+            if (Directory.Exists(folder))
+            {
+                try
+                {
+                    return Directory.EnumerateDirectories(folder);
+                }
+                catch
+                {
+                    // do nothing
+                }
+            }
 
-        public IEnumerable<string> ListFiles(string folder) =>
+            return new List<string>();
-            Try(Directory.EnumerateFiles(folder, "*", SearchOption.TopDirectoryOnly)).IfFail(new List<string>());
+        }
+
+        public IEnumerable<string> ListFiles(string folder)
+        {
+            if (Directory.Exists(folder))
+            {
+                try
+                {
+                    return Directory.EnumerateFiles(folder, "*", SearchOption.TopDirectoryOnly);
+                }
+                catch
+                {
+                    // do nothing
+                }
+            }
+
+            return new List<string>();
+        }
 
         public bool FileExists(string path) => File.Exists(path);
 

ErsatzTV.Core/Metadata/MovieFolderScanner.cs

@@ -4,7 +4,6 @@ using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
-using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Interfaces.FFmpeg;
 using ErsatzTV.Core.Interfaces.Images;
 using ErsatzTV.Core.Interfaces.Metadata;
@@ -73,11 +72,6 @@ namespace ErsatzTV.Core.Metadata
         {
             decimal progressSpread = progressMax - progressMin;
 
-            if (!_localFileSystem.IsLibraryPathAccessible(libraryPath))
-            {
-                return new MediaSourceInaccessible();
-            }
-
             var foldersCompleted = 0;
 
             var folderQueue = new Queue<string>();

ErsatzTV.Core/Metadata/MusicVideoFolderScanner.cs

@@ -4,7 +4,6 @@ using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
-using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Interfaces.FFmpeg;
 using ErsatzTV.Core.Interfaces.Images;
 using ErsatzTV.Core.Interfaces.Metadata;
@@ -74,11 +73,6 @@ namespace ErsatzTV.Core.Metadata
         {
             decimal progressSpread = progressMax - progressMin;
 
-            if (!_localFileSystem.IsLibraryPathAccessible(libraryPath))
-            {
-                return new MediaSourceInaccessible();
-            }
-
             var allArtistFolders = _localFileSystem.ListSubdirectories(libraryPath.Path)
                 .Filter(ShouldIncludeFolder)
                 .OrderBy(identity)

ErsatzTV.Core/Metadata/OtherVideoFolderScanner.cs

@@ -4,7 +4,6 @@ using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
-using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Interfaces.FFmpeg;
 using ErsatzTV.Core.Interfaces.Images;
 using ErsatzTV.Core.Interfaces.Metadata;
@@ -71,11 +70,6 @@ namespace ErsatzTV.Core.Metadata
         {
             decimal progressSpread = progressMax - progressMin;
 
-            if (!_localFileSystem.IsLibraryPathAccessible(libraryPath))
-            {
-                return new MediaSourceInaccessible();
-            }
-
             var foldersCompleted = 0;
 
             var folderQueue = new Queue<string>();

ErsatzTV.Core/Metadata/SongFolderScanner.cs

@@ -4,7 +4,6 @@ using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
-using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Extensions;
 using ErsatzTV.Core.Interfaces.FFmpeg;
 using ErsatzTV.Core.Interfaces.Images;
@@ -73,11 +72,6 @@ namespace ErsatzTV.Core.Metadata
         {
             decimal progressSpread = progressMax - progressMin;
 
-            if (!_localFileSystem.IsLibraryPathAccessible(libraryPath))
-            {
-                return new MediaSourceInaccessible();
-            }
-
             var foldersCompleted = 0;
 
             var folderQueue = new Queue<string>();

ErsatzTV.Core/Metadata/TelevisionFolderScanner.cs

@@ -4,7 +4,6 @@ using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
-using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Interfaces.FFmpeg;
 using ErsatzTV.Core.Interfaces.Images;
 using ErsatzTV.Core.Interfaces.Metadata;
@@ -73,11 +72,6 @@ namespace ErsatzTV.Core.Metadata
         {
             decimal progressSpread = progressMax - progressMin;
 
-            if (!_localFileSystem.IsLibraryPathAccessible(libraryPath))
-            {
-                return new MediaSourceInaccessible();
-            }
-
             var allShowFolders = _localFileSystem.ListSubdirectories(libraryPath.Path)
                 .Filter(ShouldIncludeFolder)
                 .OrderBy(identity)

ErsatzTV/Pages/LocalLibraryEditor.razor

@@ -188,7 +188,7 @@
 
     private void AddLibraryPath()
     {
-        if (_model.Paths.All(p => NormalizePath(p.Path) != NormalizePath(_newPath.Path)))
+        if (!string.IsNullOrWhiteSpace(_newPath.Path) && _model.Paths.All(p => NormalizePath(p.Path) != NormalizePath(_newPath.Path)))
         {
             _model.HasChanges = true;
             _model.Paths.Add(new LocalLibraryPathEditViewModel