def _GetBlobMetadata(blob_key):
 (size, content_type, open_key) = _GetGoogleStorageFileMetadata(blob_key)
 if (size is None):
  (size, content_type, open_key) = _GetBlobstoreMetadata(blob_key)
 return (size, content_type, open_key)

def _GetBlobMetadata ( blob_key ) : ( size , content_type , open_key ) = _GetGoogleStorageFileMetadata ( blob_key ) if ( size is None ) : ( size , content_type , open_key ) = _GetBlobstoreMetadata ( blob_key ) return ( size , content_type , open_key )
retrieve the metadata about a blob from the blob_key .