Fixed: No longer leaves a corrupt file if MediaCover resize failed.

src/NzbDrone.Core.Test/MediaCoverTests/ImageResizerFixture.cs

@@ -26,6 +26,14 @@ namespace NzbDrone.Core.Test.MediaCoverTests
             Mocker.GetMock<IDiskProvider>()
                   .Setup(v => v.OpenWriteStream(It.IsAny<string>()))
                   .Returns<string>(s => new FileStream(s, FileMode.Create));
+
+            Mocker.GetMock<IDiskProvider>()
+                  .Setup(v => v.FileExists(It.IsAny<string>()))
+                  .Returns<string>(s => File.Exists(s));
+
+            Mocker.GetMock<IDiskProvider>()
+                  .Setup(v => v.DeleteFile(It.IsAny<string>()))
+                  .Callback<string>(s => File.Delete(s));
         }
 
         [Test]
@@ -46,5 +54,18 @@ namespace NzbDrone.Core.Test.MediaCoverTests
             image.Height.Should().Be(170);
             image.Width.Should().Be(170);
         }
+
+        [Test]
+        public void should_delete_file_if_failed()
+        {
+            var mainFile = Path.Combine(TempFolder, "junk.png");
+            var resizedFile = Path.Combine(TempFolder, "junk-170.png");
+
+            File.WriteAllText(mainFile, "Just some junk data that should make it throw an Exception.");
+
+            Assert.Throws(Is.InstanceOf<Exception>(), () => Subject.Resize(mainFile, resizedFile, 170));
+
+            File.Exists(resizedFile).Should().BeFalse();
+        }
     }
 }

src/NzbDrone.Core.Test/MediaCoverTests/MediaCoverServiceFixture.cs

@@ -11,6 +11,7 @@ using NzbDrone.Core.MediaCover;
 using NzbDrone.Core.Test.Framework;
 using NzbDrone.Core.Tv;
 using NzbDrone.Core.Tv.Events;
+using NzbDrone.Test.Common;
 
 namespace NzbDrone.Core.Test.MediaCoverTests
 {
@@ -110,10 +111,55 @@ namespace NzbDrone.Core.Test.MediaCoverTests
                   .Setup(v => v.FileExists(It.IsAny<string>()))
                   .Returns(true);
 
+            Mocker.GetMock<IDiskProvider>()
+                  .Setup(v => v.GetFileSize(It.IsAny<string>()))
+                  .Returns(1000);
+
             Subject.HandleAsync(new SeriesUpdatedEvent(_series));
 
             Mocker.GetMock<IImageResizer>()
                   .Verify(v => v.Resize(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<int>()), Times.Never());
         }
+
+        [Test]
+        public void should_resize_covers_if_existing_is_empty()
+        {
+            Mocker.GetMock<ICoverExistsSpecification>()
+                  .Setup(v => v.AlreadyExists(It.IsAny<string>(), It.IsAny<string>()))
+                  .Returns(true);
+
+            Mocker.GetMock<IDiskProvider>()
+                  .Setup(v => v.FileExists(It.IsAny<string>()))
+                  .Returns(true);
+
+            Mocker.GetMock<IDiskProvider>()
+                  .Setup(v => v.GetFileSize(It.IsAny<string>()))
+                  .Returns(0);
+
+            Subject.HandleAsync(new SeriesUpdatedEvent(_series));
+
+            Mocker.GetMock<IImageResizer>()
+                  .Verify(v => v.Resize(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<int>()), Times.Exactly(2));
+        }
+
+        [Test]
+        public void should_log_error_if_resize_failed()
+        {
+            Mocker.GetMock<ICoverExistsSpecification>()
+                  .Setup(v => v.AlreadyExists(It.IsAny<string>(), It.IsAny<string>()))
+                  .Returns(true);
+
+            Mocker.GetMock<IDiskProvider>()
+                  .Setup(v => v.FileExists(It.IsAny<string>()))
+                  .Returns(false);
+
+            Mocker.GetMock<IImageResizer>()
+                  .Setup(v => v.Resize(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<int>()))
+                  .Throws<ApplicationException>();
+
+            Subject.HandleAsync(new SeriesUpdatedEvent(_series));
+
+            ExceptionVerification.ExpectedErrors(1);
+        }
     }
 }

src/NzbDrone.Core/MediaCover/ImageResizer.cs

@@ -22,18 +22,29 @@ namespace NzbDrone.Core.MediaCover
 
         public void Resize(string source, string destination, int height)
         {
-            using (var sourceStream = _diskProvider.OpenReadStream(source))
+            try
             {
-                using (var outputStream = _diskProvider.OpenWriteStream(destination))
+                using (var sourceStream = _diskProvider.OpenReadStream(source))
                 {
-                    var settings = new Instructions();
-                    settings.Height = height;
+                    using (var outputStream = _diskProvider.OpenWriteStream(destination))
+                    {
+                        var settings = new Instructions();
+                        settings.Height = height;
 
-                    var job = new ImageJob(sourceStream, outputStream, settings);
+                        var job = new ImageJob(sourceStream, outputStream, settings);
 
-                    ImageBuilder.Current.Build(job);
+                        ImageBuilder.Current.Build(job);
+                    }
                 }
             }
+            catch
+            {
+                if (_diskProvider.FileExists(destination))
+                {
+                    _diskProvider.DeleteFile(destination);
+                }
+                throw;
+            }
         }
     }
 }

src/NzbDrone.Core/MediaCover/MediaCoverService.cs

@@ -88,16 +88,13 @@ namespace NzbDrone.Core.MediaCover
             foreach (var cover in series.Images)
             {
                 var fileName = GetCoverPath(series.Id, cover.CoverType);
+                var alreadyExists = false;
                 try
                 {
-                    if (!_coverExistsSpecification.AlreadyExists(cover.Url, fileName))
+                    alreadyExists = _coverExistsSpecification.AlreadyExists(cover.Url, fileName);
+                    if (!alreadyExists)
                     {
                         DownloadCover(series, cover);
-                        EnsureResizedCovers(series, cover, true);
-                    }
-                    else
-                    {
-                        EnsureResizedCovers(series, cover, false);
                     }
                 }
                 catch (WebException e)
@@ -108,6 +105,15 @@ namespace NzbDrone.Core.MediaCover
                 {
                     _logger.ErrorException("Couldn't download media cover for " + series, e);
                 }
+
+                try
+                {
+                    EnsureResizedCovers(series, cover, !alreadyExists);
+                }
+                catch (Exception e)
+                {
+                    _logger.ErrorException("Couldn't resize media cover for " + series + " using full size image instead.", e);
+                }
             }
         }
 
@@ -148,7 +154,7 @@ namespace NzbDrone.Core.MediaCover
                 var mainFileName = GetCoverPath(series.Id, cover.CoverType);
                 var resizeFileName = GetCoverPath(series.Id, cover.CoverType, height);
 
-                if (forceResize || !_diskProvider.FileExists(resizeFileName))
+                if (forceResize || !_diskProvider.FileExists(resizeFileName) || _diskProvider.GetFileSize(resizeFileName) == 0)
                 {
                     _logger.Debug("Resizing {0}-{1} for {2}", cover.CoverType, height, series);