/// <summary>
/// Persist a stream given a blobId.
/// </summary>
/// <param name="blobId"></param>
/// <param name="fileName"></param>
/// <param name="sourceStream"></param>
/// <returns></returns>
private FileSystemBlobDescriptor InnerPersistOfBlob(BlobId blobId, FileNameWithExtension fileName, Stream sourceStream)
{
FileSystemBlobDescriptor descriptor = new FileSystemBlobDescriptor()
{
BlobId = blobId,
FileNameWithExtension = fileName,
Timestamp = DateTime.Now,
ContentType = MimeTypes.GetMimeType(fileName)
};
string destinationFileName = GetFileNameFromBlobIdAndRemoveDuplicates(blobId, descriptor.FileNameWithExtension);
Logger.Debug($"File {fileName} was assigned blob {blobId} and will be saved in file {destinationFileName}");
using (var md5 = MD5.Create())
using (var fileStream = new FileStream(destinationFileName, FileMode.OpenOrCreate, FileAccess.Write))
{
fileStream.Seek(0, SeekOrigin.Begin);
fileStream.SetLength(0);
Byte[] buffer = new Byte[8192];
Int32 read;
Int64 length = 0;
while ((read = sourceStream.Read(buffer, 0, buffer.Length)) > 0)
{
md5.TransformBlock(buffer, 0, read, buffer, 0);
fileStream.Write(buffer, 0, read);
length += read;
}
md5.TransformFinalBlock(buffer, 0, 0);
descriptor.Length = length;
descriptor.Md5 = BitConverter.ToString(md5.Hash).Replace("-", "");
}
Logger.Info($"Blob {blobId} saved in file {destinationFileName} with hash {descriptor.Md5} and length {descriptor.Length}");
return(descriptor);
}
public void RawStore(BlobId blobId, IBlobDescriptor descriptor)
{
Logger.InfoFormat("Ask for raw storage of blob {0} for file {1}", blobId, descriptor.FileNameWithExtension);
using (var stream = descriptor.OpenRead())
{
InnerPersistOfBlob(blobId, descriptor.FileNameWithExtension, stream);
FileSystemBlobDescriptor newDescriptor = new FileSystemBlobDescriptor()
{
BlobId = blobId,
ContentType = descriptor.ContentType,
FileNameWithExtension = descriptor.FileNameWithExtension,
Length = descriptor.Length,
Md5 = descriptor.Hash.ToString(),
Timestamp = DateTime.UtcNow,
};
_mongodDbFileSystemBlobDescriptorStorage.SaveDescriptor(newDescriptor);
}
}
