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jellyfin/MediaBrowser.Server.Impleme.../Drawing/ImageProcessor.cs

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35 KiB

using Imazen.WebP;
using MediaBrowser.Common.Extensions;
using MediaBrowser.Common.IO;
using MediaBrowser.Controller;
using MediaBrowser.Controller.Drawing;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.MediaEncoding;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Drawing;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Serialization;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Server.Implementations.Drawing
{
/// <summary>
/// Class ImageProcessor
/// </summary>
public class ImageProcessor : IImageProcessor, IDisposable
{
/// <summary>
/// The us culture
/// </summary>
protected readonly CultureInfo UsCulture = new CultureInfo("en-US");
/// <summary>
/// The _cached imaged sizes
/// </summary>
private readonly ConcurrentDictionary<Guid, ImageSize> _cachedImagedSizes;
/// <summary>
/// Gets the list of currently registered image processors
/// Image processors are specialized metadata providers that run after the normal ones
/// </summary>
/// <value>The image enhancers.</value>
public IEnumerable<IImageEnhancer> ImageEnhancers { get; private set; }
/// <summary>
/// The _logger
/// </summary>
private readonly ILogger _logger;
private readonly IFileSystem _fileSystem;
private readonly IJsonSerializer _jsonSerializer;
private readonly IServerApplicationPaths _appPaths;
private readonly IMediaEncoder _mediaEncoder;
public ImageProcessor(ILogger logger, IServerApplicationPaths appPaths, IFileSystem fileSystem, IJsonSerializer jsonSerializer, IMediaEncoder mediaEncoder)
{
_logger = logger;
_fileSystem = fileSystem;
_jsonSerializer = jsonSerializer;
_mediaEncoder = mediaEncoder;
_appPaths = appPaths;
_saveImageSizeTimer = new Timer(SaveImageSizeCallback, null, Timeout.Infinite, Timeout.Infinite);
Dictionary<Guid, ImageSize> sizeDictionary;
try
{
sizeDictionary = jsonSerializer.DeserializeFromFile<Dictionary<Guid, ImageSize>>(ImageSizeFile) ??
new Dictionary<Guid, ImageSize>();
}
catch (FileNotFoundException)
{
// No biggie
sizeDictionary = new Dictionary<Guid, ImageSize>();
}
catch (Exception ex)
{
logger.ErrorException("Error parsing image size cache file", ex);
sizeDictionary = new Dictionary<Guid, ImageSize>();
}
_cachedImagedSizes = new ConcurrentDictionary<Guid, ImageSize>(sizeDictionary);
LogWebPVersion();
}
private string ResizedImageCachePath
{
get
{
return Path.Combine(_appPaths.ImageCachePath, "resized-images");
}
}
private string EnhancedImageCachePath
{
get
{
return Path.Combine(_appPaths.ImageCachePath, "enhanced-images");
}
}
private string CroppedWhitespaceImageCachePath
{
get
{
return Path.Combine(_appPaths.ImageCachePath, "cropped-images");
}
}
public void AddParts(IEnumerable<IImageEnhancer> enhancers)
{
ImageEnhancers = enhancers.ToArray();
}
public async Task ProcessImage(ImageProcessingOptions options, Stream toStream)
{
var file = await ProcessImage(options).ConfigureAwait(false);
using (var fileStream = _fileSystem.GetFileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read, true))
{
await fileStream.CopyToAsync(toStream).ConfigureAwait(false);
}
}
public async Task<string> ProcessImage(ImageProcessingOptions options)
{
if (options == null)
{
throw new ArgumentNullException("options");
}
var originalImagePath = options.Image.Path;
if (options.HasDefaultOptions(originalImagePath) && options.Enhancers.Count == 0 && !options.CropWhiteSpace)
{
// Just spit out the original file if all the options are default
return originalImagePath;
}
var dateModified = options.Image.DateModified;
if (options.CropWhiteSpace)
{
var tuple = await GetWhitespaceCroppedImage(originalImagePath, dateModified).ConfigureAwait(false);
originalImagePath = tuple.Item1;
dateModified = tuple.Item2;
}
if (options.Enhancers.Count > 0)
{
var tuple = await GetEnhancedImage(options.Image, options.Item, options.ImageIndex, options.Enhancers).ConfigureAwait(false);
originalImagePath = tuple.Item1;
dateModified = tuple.Item2;
}
var originalImageSize = GetImageSize(originalImagePath, dateModified);
// Determine the output size based on incoming parameters
var newSize = DrawingUtils.Resize(originalImageSize, options.Width, options.Height, options.MaxWidth, options.MaxHeight);
if (options.HasDefaultOptionsWithoutSize(originalImagePath) && newSize.Equals(originalImageSize) && options.Enhancers.Count == 0)
{
// Just spit out the original file if the new size equals the old
return originalImagePath;
}
var quality = options.Quality ?? 90;
var cacheFilePath = GetCacheFilePath(originalImagePath, newSize, quality, dateModified, options.OutputFormat, options.AddPlayedIndicator, options.PercentPlayed, options.UnplayedCount, options.BackgroundColor);
var semaphore = GetLock(cacheFilePath);
await semaphore.WaitAsync().ConfigureAwait(false);
// Check again in case of lock contention
try
{
if (File.Exists(cacheFilePath))
{
semaphore.Release();
return cacheFilePath;
}
}
catch
{
semaphore.Release();
throw;
}
try
{
var hasPostProcessing = !string.IsNullOrEmpty(options.BackgroundColor) || options.UnplayedCount.HasValue || options.AddPlayedIndicator || options.PercentPlayed > 0;
using (var fileStream = _fileSystem.GetFileStream(originalImagePath, FileMode.Open, FileAccess.Read, FileShare.Read, true))
{
// Copy to memory stream to avoid Image locking file
using (var memoryStream = new MemoryStream())
{
await fileStream.CopyToAsync(memoryStream).ConfigureAwait(false);
using (var originalImage = Image.FromStream(memoryStream, true, false))
{
var newWidth = Convert.ToInt32(newSize.Width);
var newHeight = Convert.ToInt32(newSize.Height);
var selectedOutputFormat = options.OutputFormat == ImageOutputFormat.Webp && !_webpAvailable
? GetFallbackImageFormat(originalImagePath)
: options.OutputFormat;
// Graphics.FromImage will throw an exception if the PixelFormat is Indexed, so we need to handle that here
// Also, Webp only supports Format32bppArgb and Format32bppRgb
var pixelFormat = selectedOutputFormat == ImageOutputFormat.Webp
? PixelFormat.Format32bppArgb
: PixelFormat.Format32bppPArgb;
using (var thumbnail = new Bitmap(newWidth, newHeight, pixelFormat))
{
// Mono throw an exeception if assign 0 to SetResolution
if (originalImage.HorizontalResolution > 0 && originalImage.VerticalResolution > 0)
{
// Preserve the original resolution
thumbnail.SetResolution(originalImage.HorizontalResolution, originalImage.VerticalResolution);
}
using (var thumbnailGraph = Graphics.FromImage(thumbnail))
{
thumbnailGraph.CompositingQuality = CompositingQuality.HighQuality;
thumbnailGraph.SmoothingMode = SmoothingMode.HighQuality;
thumbnailGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
thumbnailGraph.PixelOffsetMode = PixelOffsetMode.HighQuality;
thumbnailGraph.CompositingMode = !hasPostProcessing ?
CompositingMode.SourceCopy :
CompositingMode.SourceOver;
SetBackgroundColor(thumbnailGraph, options);
thumbnailGraph.DrawImage(originalImage, 0, 0, newWidth, newHeight);
DrawIndicator(thumbnailGraph, newWidth, newHeight, options);
var outputFormat = GetOutputFormat(originalImage, selectedOutputFormat);
Directory.CreateDirectory(Path.GetDirectoryName(cacheFilePath));
// Save to the cache location
using (var cacheFileStream = _fileSystem.GetFileStream(cacheFilePath, FileMode.Create, FileAccess.Write, FileShare.Read, false))
{
if (selectedOutputFormat == ImageOutputFormat.Webp)
{
SaveToWebP(thumbnail, cacheFileStream, quality);
}
else
{
// Save to the memory stream
thumbnail.Save(outputFormat, cacheFileStream, quality);
}
}
return cacheFilePath;
}
}
}
}
}
}
finally
{
semaphore.Release();
}
}
private ImageOutputFormat GetFallbackImageFormat(string originalImagePath)
{
return ImageOutputFormat.Png;
}
private void SaveToWebP(Bitmap thumbnail, Stream toStream, int quality)
{
new SimpleEncoder().Encode(thumbnail, toStream, quality);
}
private bool _webpAvailable = true;
private void LogWebPVersion()
{
try
{
_logger.Info("libwebp version: " + SimpleEncoder.GetEncoderVersion());
}
catch (Exception ex)
{
_logger.ErrorException("Error loading libwebp: ", ex);
_webpAvailable = false;
}
}
/// <summary>
/// Sets the color of the background.
/// </summary>
/// <param name="graphics">The graphics.</param>
/// <param name="options">The options.</param>
private void SetBackgroundColor(Graphics graphics, ImageProcessingOptions options)
{
var color = options.BackgroundColor;
if (!string.IsNullOrEmpty(color))
{
Color drawingColor;
try
{
drawingColor = ColorTranslator.FromHtml(color);
}
catch
{
drawingColor = ColorTranslator.FromHtml("#" + color);
}
graphics.Clear(drawingColor);
}
}
/// <summary>
/// Draws the indicator.
/// </summary>
/// <param name="graphics">The graphics.</param>
/// <param name="imageWidth">Width of the image.</param>
/// <param name="imageHeight">Height of the image.</param>
/// <param name="options">The options.</param>
private void DrawIndicator(Graphics graphics, int imageWidth, int imageHeight, ImageProcessingOptions options)
{
if (!options.AddPlayedIndicator && !options.UnplayedCount.HasValue && options.PercentPlayed.Equals(0))
{
return;
}
try
{
if (options.AddPlayedIndicator)
{
var currentImageSize = new Size(imageWidth, imageHeight);
new PlayedIndicatorDrawer().DrawPlayedIndicator(graphics, currentImageSize);
}
else if (options.UnplayedCount.HasValue)
{
var currentImageSize = new Size(imageWidth, imageHeight);
new UnplayedCountIndicator().DrawUnplayedCountIndicator(graphics, currentImageSize, options.UnplayedCount.Value);
}
if (options.PercentPlayed >= 0)
{
var currentImageSize = new Size(imageWidth, imageHeight);
new PercentPlayedDrawer().Process(graphics, currentImageSize, options.PercentPlayed);
}
}
catch (Exception ex)
{
_logger.ErrorException("Error drawing indicator overlay", ex);
}
}
/// <summary>
/// Gets the output format.
/// </summary>
/// <param name="image">The image.</param>
/// <param name="outputFormat">The output format.</param>
/// <returns>ImageFormat.</returns>
private System.Drawing.Imaging.ImageFormat GetOutputFormat(Image image, ImageOutputFormat outputFormat)
{
switch (outputFormat)
{
case ImageOutputFormat.Bmp:
return System.Drawing.Imaging.ImageFormat.Bmp;
case ImageOutputFormat.Gif:
return System.Drawing.Imaging.ImageFormat.Gif;
case ImageOutputFormat.Jpg:
return System.Drawing.Imaging.ImageFormat.Jpeg;
case ImageOutputFormat.Png:
return System.Drawing.Imaging.ImageFormat.Png;
default:
return image.RawFormat;
}
}
/// <summary>
/// Crops whitespace from an image, caches the result, and returns the cached path
/// </summary>
/// <param name="originalImagePath">The original image path.</param>
/// <param name="dateModified">The date modified.</param>
/// <returns>System.String.</returns>
private async Task<Tuple<string, DateTime>> GetWhitespaceCroppedImage(string originalImagePath, DateTime dateModified)
{
var name = originalImagePath;
name += "datemodified=" + dateModified.Ticks;
var croppedImagePath = GetCachePath(CroppedWhitespaceImageCachePath, name, Path.GetExtension(originalImagePath));
var semaphore = GetLock(croppedImagePath);
await semaphore.WaitAsync().ConfigureAwait(false);
// Check again in case of contention
if (File.Exists(croppedImagePath))
{
semaphore.Release();
return new Tuple<string, DateTime>(croppedImagePath, _fileSystem.GetLastWriteTimeUtc(croppedImagePath));
}
try
{
using (var fileStream = _fileSystem.GetFileStream(originalImagePath, FileMode.Open, FileAccess.Read, FileShare.Read, true))
{
// Copy to memory stream to avoid Image locking file
using (var memoryStream = new MemoryStream())
{
await fileStream.CopyToAsync(memoryStream).ConfigureAwait(false);
using (var originalImage = (Bitmap)Image.FromStream(memoryStream, true, false))
{
var outputFormat = originalImage.RawFormat;
using (var croppedImage = originalImage.CropWhitespace())
{
Directory.CreateDirectory(Path.GetDirectoryName(croppedImagePath));
using (var outputStream = _fileSystem.GetFileStream(croppedImagePath, FileMode.Create, FileAccess.Write, FileShare.Read, false))
{
croppedImage.Save(outputFormat, outputStream, 100);
}
}
}
}
}
}
catch (Exception ex)
{
// We have to have a catch-all here because some of the .net image methods throw a plain old Exception
_logger.ErrorException("Error cropping image {0}", ex, originalImagePath);
return new Tuple<string, DateTime>(originalImagePath, dateModified);
}
finally
{
semaphore.Release();
}
return new Tuple<string, DateTime>(croppedImagePath, _fileSystem.GetLastWriteTimeUtc(croppedImagePath));
}
/// <summary>
/// Increment this when indicator drawings change
/// </summary>
private const string IndicatorVersion = "2";
/// <summary>
/// Gets the cache file path based on a set of parameters
/// </summary>
private string GetCacheFilePath(string originalPath, ImageSize outputSize, int quality, DateTime dateModified, ImageOutputFormat format, bool addPlayedIndicator, double percentPlayed, int? unwatchedCount, string backgroundColor)
{
var filename = originalPath;
filename += "width=" + outputSize.Width;
filename += "height=" + outputSize.Height;
filename += "quality=" + quality;
filename += "datemodified=" + dateModified.Ticks;
if (format != ImageOutputFormat.Original)
{
filename += "f=" + format;
}
var hasIndicator = false;
if (addPlayedIndicator)
{
filename += "pl=true";
hasIndicator = true;
}
if (percentPlayed > 0)
{
filename += "p=" + percentPlayed;
hasIndicator = true;
}
if (unwatchedCount.HasValue)
{
filename += "p=" + unwatchedCount.Value;
hasIndicator = true;
}
if (hasIndicator)
{
filename += "iv=" + IndicatorVersion;
}
if (!string.IsNullOrEmpty(backgroundColor))
{
filename += "b=" + backgroundColor;
}
return GetCachePath(ResizedImageCachePath, filename, Path.GetExtension(originalPath));
}
/// <summary>
/// Gets the size of the image.
/// </summary>
/// <param name="path">The path.</param>
/// <returns>ImageSize.</returns>
public ImageSize GetImageSize(string path)
{
return GetImageSize(path, File.GetLastWriteTimeUtc(path));
}
/// <summary>
/// Gets the size of the image.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="imageDateModified">The image date modified.</param>
/// <returns>ImageSize.</returns>
/// <exception cref="System.ArgumentNullException">path</exception>
public ImageSize GetImageSize(string path, DateTime imageDateModified)
{
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException("path");
}
var name = path + "datemodified=" + imageDateModified.Ticks;
ImageSize size;
var cacheHash = name.GetMD5();
if (!_cachedImagedSizes.TryGetValue(cacheHash, out size))
{
size = GetImageSizeInternal(path);
_cachedImagedSizes.AddOrUpdate(cacheHash, size, (keyName, oldValue) => size);
}
return size;
}
/// <summary>
/// Gets the image size internal.
/// </summary>
/// <param name="path">The path.</param>
/// <returns>ImageSize.</returns>
private ImageSize GetImageSizeInternal(string path)
{
var size = ImageHeader.GetDimensions(path, _logger, _fileSystem);
StartSaveImageSizeTimer();
return new ImageSize { Width = size.Width, Height = size.Height };
}
private readonly Timer _saveImageSizeTimer;
private const int SaveImageSizeTimeout = 5000;
private readonly object _saveImageSizeLock = new object();
private void StartSaveImageSizeTimer()
{
_saveImageSizeTimer.Change(SaveImageSizeTimeout, Timeout.Infinite);
}
private void SaveImageSizeCallback(object state)
{
lock (_saveImageSizeLock)
{
try
{
var path = ImageSizeFile;
Directory.CreateDirectory(Path.GetDirectoryName(path));
_jsonSerializer.SerializeToFile(_cachedImagedSizes, path);
}
catch (Exception ex)
{
_logger.ErrorException("Error saving image size file", ex);
}
}
}
private string ImageSizeFile
{
get
{
return Path.Combine(_appPaths.DataPath, "imagesizes.json");
}
}
/// <summary>
/// Gets the image cache tag.
/// </summary>
/// <param name="item">The item.</param>
/// <param name="image">The image.</param>
/// <returns>Guid.</returns>
/// <exception cref="System.ArgumentNullException">item</exception>
public string GetImageCacheTag(IHasImages item, ItemImageInfo image)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
if (image == null)
{
throw new ArgumentNullException("image");
}
var supportedEnhancers = GetSupportedEnhancers(item, image.Type);
return GetImageCacheTag(item, image, supportedEnhancers.ToList());
}
/// <summary>
/// Gets the image cache tag.
/// </summary>
/// <param name="item">The item.</param>
/// <param name="image">The image.</param>
/// <param name="imageEnhancers">The image enhancers.</param>
/// <returns>Guid.</returns>
/// <exception cref="System.ArgumentNullException">item</exception>
public string GetImageCacheTag(IHasImages item, ItemImageInfo image, List<IImageEnhancer> imageEnhancers)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
if (imageEnhancers == null)
{
throw new ArgumentNullException("imageEnhancers");
}
if (image == null)
{
throw new ArgumentNullException("image");
}
var originalImagePath = image.Path;
var dateModified = image.DateModified;
var imageType = image.Type;
// Optimization
if (imageEnhancers.Count == 0)
{
return (originalImagePath + dateModified.Ticks).GetMD5().ToString("N");
}
// Cache name is created with supported enhancers combined with the last config change so we pick up new config changes
var cacheKeys = imageEnhancers.Select(i => i.GetConfigurationCacheKey(item, imageType)).ToList();
cacheKeys.Add(originalImagePath + dateModified.Ticks);
return string.Join("|", cacheKeys.ToArray()).GetMD5().ToString("N");
}
/// <summary>
/// Gets the enhanced image.
/// </summary>
/// <param name="item">The item.</param>
/// <param name="imageType">Type of the image.</param>
/// <param name="imageIndex">Index of the image.</param>
/// <returns>Task{System.String}.</returns>
public async Task<string> GetEnhancedImage(IHasImages item, ImageType imageType, int imageIndex)
{
var enhancers = GetSupportedEnhancers(item, imageType).ToList();
var imageInfo = item.GetImageInfo(imageType, imageIndex);
var result = await GetEnhancedImage(imageInfo, item, imageIndex, enhancers);
return result.Item1;
}
private async Task<Tuple<string, DateTime>> GetEnhancedImage(ItemImageInfo image,
IHasImages item,
int imageIndex,
List<IImageEnhancer> enhancers)
{
var originalImagePath = image.Path;
var dateModified = image.DateModified;
var imageType = image.Type;
try
{
var cacheGuid = GetImageCacheTag(item, image, enhancers);
// Enhance if we have enhancers
var ehnancedImagePath = await GetEnhancedImageInternal(originalImagePath, item, imageType, imageIndex, enhancers, cacheGuid).ConfigureAwait(false);
// If the path changed update dateModified
if (!ehnancedImagePath.Equals(originalImagePath, StringComparison.OrdinalIgnoreCase))
{
dateModified = _fileSystem.GetLastWriteTimeUtc(ehnancedImagePath);
return new Tuple<string, DateTime>(ehnancedImagePath, dateModified);
}
}
catch (Exception ex)
{
_logger.Error("Error enhancing image", ex);
}
return new Tuple<string, DateTime>(originalImagePath, dateModified);
}
/// <summary>
/// Runs an image through the image enhancers, caches the result, and returns the cached path
/// </summary>
/// <param name="originalImagePath">The original image path.</param>
/// <param name="item">The item.</param>
/// <param name="imageType">Type of the image.</param>
/// <param name="imageIndex">Index of the image.</param>
/// <param name="supportedEnhancers">The supported enhancers.</param>
/// <param name="cacheGuid">The cache unique identifier.</param>
/// <returns>System.String.</returns>
/// <exception cref="System.ArgumentNullException">originalImagePath</exception>
private async Task<string> GetEnhancedImageInternal(string originalImagePath,
IHasImages item,
ImageType imageType,
int imageIndex,
IEnumerable<IImageEnhancer> supportedEnhancers,
string cacheGuid)
{
if (string.IsNullOrEmpty(originalImagePath))
{
throw new ArgumentNullException("originalImagePath");
}
if (item == null)
{
throw new ArgumentNullException("item");
}
// All enhanced images are saved as png to allow transparency
var enhancedImagePath = GetCachePath(EnhancedImageCachePath, cacheGuid + ".png");
var semaphore = GetLock(enhancedImagePath);
await semaphore.WaitAsync().ConfigureAwait(false);
// Check again in case of contention
if (File.Exists(enhancedImagePath))
{
semaphore.Release();
return enhancedImagePath;
}
try
{
using (var fileStream = _fileSystem.GetFileStream(originalImagePath, FileMode.Open, FileAccess.Read, FileShare.Read, true))
{
// Copy to memory stream to avoid Image locking file
using (var memoryStream = new MemoryStream())
{
await fileStream.CopyToAsync(memoryStream).ConfigureAwait(false);
using (var originalImage = Image.FromStream(memoryStream, true, false))
{
//Pass the image through registered enhancers
using (var newImage = await ExecuteImageEnhancers(supportedEnhancers, originalImage, item, imageType, imageIndex).ConfigureAwait(false))
{
var parentDirectory = Path.GetDirectoryName(enhancedImagePath);
Directory.CreateDirectory(parentDirectory);
//And then save it in the cache
using (var outputStream = _fileSystem.GetFileStream(enhancedImagePath, FileMode.Create, FileAccess.Write, FileShare.Read, false))
{
newImage.Save(System.Drawing.Imaging.ImageFormat.Png, outputStream, 100);
}
}
}
}
}
}
finally
{
semaphore.Release();
}
return enhancedImagePath;
}
/// <summary>
/// Executes the image enhancers.
/// </summary>
/// <param name="imageEnhancers">The image enhancers.</param>
/// <param name="originalImage">The original image.</param>
/// <param name="item">The item.</param>
/// <param name="imageType">Type of the image.</param>
/// <param name="imageIndex">Index of the image.</param>
/// <returns>Task{EnhancedImage}.</returns>
private async Task<Image> ExecuteImageEnhancers(IEnumerable<IImageEnhancer> imageEnhancers, Image originalImage, IHasImages item, ImageType imageType, int imageIndex)
{
var result = originalImage;
// Run the enhancers sequentially in order of priority
foreach (var enhancer in imageEnhancers)
{
var typeName = enhancer.GetType().Name;
try
{
result = await enhancer.EnhanceImageAsync(item, result, imageType, imageIndex).ConfigureAwait(false);
}
catch (Exception ex)
{
_logger.ErrorException("{0} failed enhancing {1}", ex, typeName, item.Name);
throw;
}
}
return result;
}
/// <summary>
/// The _semaphoreLocks
/// </summary>
private readonly ConcurrentDictionary<string, object> _locks = new ConcurrentDictionary<string, object>();
/// <summary>
/// Gets the lock.
/// </summary>
/// <param name="filename">The filename.</param>
/// <returns>System.Object.</returns>
private object GetObjectLock(string filename)
{
return _locks.GetOrAdd(filename, key => new object());
}
/// <summary>
/// The _semaphoreLocks
/// </summary>
private readonly ConcurrentDictionary<string, SemaphoreSlim> _semaphoreLocks = new ConcurrentDictionary<string, SemaphoreSlim>();
/// <summary>
/// Gets the lock.
/// </summary>
/// <param name="filename">The filename.</param>
/// <returns>System.Object.</returns>
private SemaphoreSlim GetLock(string filename)
{
return _semaphoreLocks.GetOrAdd(filename, key => new SemaphoreSlim(1, 1));
}
/// <summary>
/// Gets the cache path.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="uniqueName">Name of the unique.</param>
/// <param name="fileExtension">The file extension.</param>
/// <returns>System.String.</returns>
/// <exception cref="System.ArgumentNullException">
/// path
/// or
/// uniqueName
/// or
/// fileExtension
/// </exception>
public string GetCachePath(string path, string uniqueName, string fileExtension)
{
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException("path");
}
if (string.IsNullOrEmpty(uniqueName))
{
throw new ArgumentNullException("uniqueName");
}
if (string.IsNullOrEmpty(fileExtension))
{
throw new ArgumentNullException("fileExtension");
}
var filename = uniqueName.GetMD5() + fileExtension;
return GetCachePath(path, filename);
}
/// <summary>
/// Gets the cache path.
/// </summary>
/// <param name="path">The path.</param>
/// <param name="filename">The filename.</param>
/// <returns>System.String.</returns>
/// <exception cref="System.ArgumentNullException">
/// path
/// or
/// filename
/// </exception>
public string GetCachePath(string path, string filename)
{
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException("path");
}
if (string.IsNullOrEmpty(filename))
{
throw new ArgumentNullException("filename");
}
var prefix = filename.Substring(0, 1);
path = Path.Combine(path, prefix);
return Path.Combine(path, filename);
}
public IEnumerable<IImageEnhancer> GetSupportedEnhancers(IHasImages item, ImageType imageType)
{
return ImageEnhancers.Where(i =>
{
try
{
return i.Supports(item, imageType);
}
catch (Exception ex)
{
_logger.ErrorException("Error in image enhancer: {0}", ex, i.GetType().Name);
return false;
}
});
}
public void Dispose()
{
_saveImageSizeTimer.Dispose();
}
}
}