private HttpResponseMessage HttpResponseWithStream(string fileId, string blobId, string fileName)
{
var mediaType = MimeTypeMap.GetMimeType(Path.GetExtension(fileName));
var response = Request.CreateResponse(HttpStatusCode.OK);
response.Content = new PushStreamContent((stream, httpContent, transportContext) =>
{
try
{
Log.Information($"Sending file {fileId} finised success.");
_repository.LoadStream(blobId, stream);
}
catch (HttpException ex)
{
Log.Warning(ex, $"Sending file {fileId} finised with error.");
// TODO: Magic number use - need to create a constant for this error
if (ex.ErrorCode == -2147023667) // The remote host closed the connection.
{
return;
}
}
finally
{
// Close output stream as we are done
stream.Close();
}
});
response.Content.Headers.ContentType = new MediaTypeHeaderValue(mediaType);
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
FileName = fileName
};
return(response);
}
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);
}
}
}
