def rpc_get_names(self, filename, source, offset):
        """Get all possible names

        """
        source = get_source(source)
        if hasattr(self.backend, "rpc_get_names"):
            return self.backend.rpc_get_names(filename, source, offset)
        else:
            raise Fault("get_names not implemented by current backend",
                        code=400)
Get all possible names