public async ValueTask <ThumbnailGeneratorGetThumbnailResult> GetThumbnailAsync(NestedPath filePath, ThumbnailGeneratorGetThumbnailOptions options, bool cacheOnly = false, CancellationToken cancellationToken = default)
{
await Task.Delay(1, cancellationToken).ConfigureAwait(false);
if (!await _fileSystem.ExistsFileAsync(filePath, cancellationToken))
{
return(new ThumbnailGeneratorGetThumbnailResult(ThumbnailGeneratorGetThumbnailResultStatus.Failed));
}
ThumbnailGeneratorGetThumbnailResult result = default;
// Cache
result = await this.GetThumbnailFromCacheAsync(filePath, options, cancellationToken).ConfigureAwait(false);
if (result.Status == ThumbnailGeneratorGetThumbnailResultStatus.Succeeded)
{
return(result);
}
if (cacheOnly)
{
return(new ThumbnailGeneratorGetThumbnailResult(ThumbnailGeneratorGetThumbnailResultStatus.Failed));
}
// Picture
result = await this.GetPictureThumbnailAsync(filePath, options, cancellationToken).ConfigureAwait(false);
if (result.Status == ThumbnailGeneratorGetThumbnailResultStatus.Succeeded)
{
return(result);
}
// Movie
result = await this.GetMovieThumbnailAsync(filePath, options, cancellationToken).ConfigureAwait(false);
if (result.Status == ThumbnailGeneratorGetThumbnailResultStatus.Succeeded)
{
return(result);
}
return(new ThumbnailGeneratorGetThumbnailResult(ThumbnailGeneratorGetThumbnailResultStatus.Failed));
}
private async ValueTask <ThumbnailGeneratorGetThumbnailResult> GetPictureThumbnailAsync(NestedPath filePath, ThumbnailGeneratorGetThumbnailOptions options, CancellationToken cancellationToken = default)
{
var ext = filePath.GetExtension().ToLower();
if (!_pictureTypeExtensionList.Contains(ext))
{
return(new ThumbnailGeneratorGetThumbnailResult(ThumbnailGeneratorGetThumbnailResultStatus.Failed));
}
try
{
var fileLength = await _fileSystem.GetFileSizeAsync(filePath, cancellationToken);
var fileLastWriteTime = await _fileSystem.GetFileLastWriteTimeAsync(filePath, cancellationToken);
using (var inStream = await _fileSystem.GetFileStreamAsync(filePath, cancellationToken))
using (var outStream = new RecyclableMemoryStream(_bytesPool))
{
this.ConvertImage(inStream, outStream, options.Width, options.Height, options.ResizeType, options.FormatType);
outStream.Seek(0, SeekOrigin.Begin);
var image = outStream.ToMemoryOwner();
var fileMeta = new FileMeta(filePath, (ulong)fileLength, Timestamp.FromDateTime(fileLastWriteTime));
var thumbnailMeta = new ThumbnailMeta(options.ResizeType, options.FormatType, (uint)options.Width, (uint)options.Height);
var content = new ThumbnailContent(image);
var cache = new ThumbnailCache(fileMeta, thumbnailMeta, new[] { content });
await _thumbnailGeneratorRepository.ThumbnailCaches.InsertAsync(cache);
return(new ThumbnailGeneratorGetThumbnailResult(ThumbnailGeneratorGetThumbnailResultStatus.Succeeded, cache.Contents));
}
}
catch (NotSupportedException e)
{
_logger.Warn(e);
}
catch (OperationCanceledException e)
{
_logger.Debug(e);
}
catch (Exception e)
{
_logger.Error(e);
throw;
}
return(new ThumbnailGeneratorGetThumbnailResult(ThumbnailGeneratorGetThumbnailResultStatus.Failed));
}
private async ValueTask <ThumbnailGeneratorGetThumbnailResult> GetMovieThumbnailAsync(NestedPath filePath, ThumbnailGeneratorGetThumbnailOptions options, CancellationToken cancellationToken = default)
{
if (!_movieTypeExtensionList.Contains(filePath.GetExtension().ToLower()))
{
return(new ThumbnailGeneratorGetThumbnailResult(ThumbnailGeneratorGetThumbnailResultStatus.Failed));
}
try
{
var fileLength = await _fileSystem.GetFileSizeAsync(filePath, cancellationToken);
var fileLastWriteTime = await _fileSystem.GetFileLastWriteTimeAsync(filePath, cancellationToken);
var images = await this.GetMovieImagesAsync(filePath, options.MinInterval, options.MaxImageCount, options.Width, options.Height, options.ResizeType, options.FormatType, cancellationToken).ConfigureAwait(false);
var fileMeta = new FileMeta(filePath, (ulong)fileLength, Timestamp.FromDateTime(fileLastWriteTime));
var thumbnailMeta = new ThumbnailMeta(options.ResizeType, options.FormatType, (uint)options.Width, (uint)options.Height);
var contents = images.Select(n => new ThumbnailContent(n)).ToArray();
var cache = new ThumbnailCache(fileMeta, thumbnailMeta, contents);
await _thumbnailGeneratorRepository.ThumbnailCaches.InsertAsync(cache);
return(new ThumbnailGeneratorGetThumbnailResult(ThumbnailGeneratorGetThumbnailResultStatus.Succeeded, cache.Contents));
}
catch (NotSupportedException e)
{
_logger.Warn(e);
}
catch (OperationCanceledException e)
{
_logger.Debug(e);
}
catch (Exception e)
{
_logger.Error(e);
throw;
}
return(new ThumbnailGeneratorGetThumbnailResult(ThumbnailGeneratorGetThumbnailResultStatus.Failed));
}
private async ValueTask <ThumbnailGeneratorGetThumbnailResult> GetThumbnailFromCacheAsync(NestedPath filePath, ThumbnailGeneratorGetThumbnailOptions options, CancellationToken cancellationToken = default)
{
var cache = await _thumbnailGeneratorRepository.ThumbnailCaches.FindOneAsync(filePath, options.Width, options.Height, options.ResizeType, options.FormatType);
if (cache is null)
{
return(new ThumbnailGeneratorGetThumbnailResult(ThumbnailGeneratorGetThumbnailResultStatus.Failed));
}
var fileLength = await _fileSystem.GetFileSizeAsync(filePath, cancellationToken);
var fileLastWriteTime = await _fileSystem.GetFileLastWriteTimeAsync(filePath, cancellationToken);
if ((ulong)fileLength != cache.FileMeta.Length &&
Timestamp.FromDateTime(fileLastWriteTime) != cache.FileMeta.LastWriteTime)
{
return(new ThumbnailGeneratorGetThumbnailResult(ThumbnailGeneratorGetThumbnailResultStatus.Failed));
}
return(new ThumbnailGeneratorGetThumbnailResult(ThumbnailGeneratorGetThumbnailResultStatus.Succeeded, cache.Contents));
}
