def ReceiveFetchedFile(self, stat_entry, unused_hash_obj,
                         request_data=None):
    _ = request_data
    self.SendReply(stat_entry)
This method will be called for each new file successfully fetched.
dataset/ETHPy150Open google/grr/grr/lib/flows/general/transfer.py/MultiGetFile.ReceiveFetchedFile