string DoUpload(StorageNode node, string fileName)
{
// upload file
string id = FastDFSClient.UploadFileByName(node, fileName);
// set name as metadata
Dictionary <string, string> metaData = new Dictionary <string, string>();
metaData["filename"] = Path.GetFileNameWithoutExtension(fileName);
FastDFSClient.SetMetaData(node, id, metaData);
return(string.Format("{0}/{1}", node.GroupName, id));
}