public void ProcessImage(SourceFileUploadedMessage message)
{
string extension = Path.GetExtension(message.SourceFileName);
if (!FileRasterizer.Supports(extension))
{
var error = $"Unsupported file type {extension}";
new ProcessingInfo
{
FileDescriptorId = message.ImageDescriptorId,
ProcessingError = error
}.SaveTo(_repository);
Log.Information(error);
return;
}
var format = _options.ImageFormat.ParseImageFormat();
var imageBlobId = Guid.NewGuid().Encode();
var imageFileName = $"{imageBlobId}.{format}";
var rasterizer = new FileRasterizer();
var sourceTempFilePath = Path.Combine(Environment.CurrentDirectory, Guid.NewGuid().Encode());
try
{
using (var sourceStream = File.Create(sourceTempFilePath))
{
Log.Information($"Loading source {message.SourceDescriptorId}");
_repository.LoadStream(message.SourceBlobId, sourceStream);
Log.Information($"Rasterizing source {message.SourceDescriptorId}");
sourceStream.Position = 0;
var image = rasterizer.Rasterize(sourceStream, extension);
image = image.Scale(message.ImageSize.Width, message.ImageSize.Height);
Log.Information($"Saving image file {message.ImageDescriptorId} as {format}");
using (var imageStream = new MemoryStream())
{
var imageData = image.Convert(format);
imageStream.Write(imageData, 0, imageData.Length);
_repository.SaveStream(imageBlobId, imageStream);
new FileDescriptor
{
DescriptorId = message.ImageDescriptorId,
FileName = imageFileName,
BlobId = imageBlobId
}.SaveTo(_repository);
_repository.SetExpiration(message.ImageDescriptorId, message.SourceExpiry);
_repository.SetStreamExpiration(imageBlobId, message.SourceExpiry);
_repository.Delete(message.ProcessingInfoId);
}
Log.Information($"Image {message.ImageDescriptorId} processed");
}
}
catch (Exception ex)
{
var error = $"Processing exception for source {message.SourceDescriptorId}: {ex.ToString()}";
new ProcessingInfo
{
FileDescriptorId = message.ImageDescriptorId,
ProcessingError = error
}.SaveTo(_repository);
Log.Information(error);
}
finally
{
if (File.Exists(sourceTempFilePath))
{
File.Delete(sourceTempFilePath);
}
}
}
private UploadedFileInfo SaveFile(MultipartFileData file)
{
var fileName = file.Headers.ContentDisposition.FileName ?? file.Headers.ContentDisposition.Name;
fileName = fileName?.Trim('"');
var fileInfo = new UploadedFileInfo {
FileName = fileName
};
var sourceDescriptorId = Guid.NewGuid().Encode();
var imageDescriptorId = Guid.NewGuid().Encode();
var processingInfoId = Guid.NewGuid().Encode();
try
{
Log.Information($"Uploading file {sourceDescriptorId}");
var sourceBlobId = UploadFileData(file.LocalFileName);
var fileExpiry = GetFileExpiry(file);
// save source descriptor
Log.Information($"Saving source desctiptor {sourceDescriptorId}");
new FileDescriptor
{
DescriptorId = sourceDescriptorId,
FileName = fileName,
BlobId = sourceBlobId,
}.SaveTo(_repository);
_repository.SetExpiration(sourceDescriptorId, fileExpiry);
_repository.SetStreamExpiration(sourceBlobId, fileExpiry);
// save image descriptor
Log.Information($"Saving image desctiptor {imageDescriptorId}");
new FileDescriptor
{
DescriptorId = imageDescriptorId,
ProcessingInfoId = processingInfoId,
}.SaveTo(_repository);
_repository.SetExpiration(imageDescriptorId, fileExpiry);
// save processing info
Log.Information($"Saving processing info {processingInfoId}");
new ProcessingInfo()
{
ProcessingInfoId = processingInfoId,
FileDescriptorId = imageDescriptorId,
}.SaveTo(_repository);
_repository.SetExpiration(processingInfoId, fileExpiry);
// publish message for processing
Log.Information($"Publishing processing message for source {sourceDescriptorId}");
_bus.Publish(new SourceFileUploadedMessage
{
SourceDescriptorId = sourceDescriptorId,
SourceBlobId = sourceBlobId,
SourceFileName = fileName,
ImageDescriptorId = imageDescriptorId,
ProcessingInfoId = processingInfoId,
SourceExpiry = fileExpiry,
ImageSize = GetImageSize(file)
});
fileInfo.SourceId = sourceDescriptorId;
fileInfo.ImageId = imageDescriptorId;
}
catch (Exception ex)
{
Log.Warning(ex, $"Saving file {sourceDescriptorId} with error.");
fileInfo.Error = ex.Message;
}
File.Delete(file.LocalFileName);
return(fileInfo);
}