cloudi_core

%-*-Mode:erlang;coding:utf-8;tab-width:4;c-basic-offset:4;indent-tabs-mode:()-*-
% ex: set ft=erlang fenc=utf-8 sts=4 ts=4 sw=4 et nomod:
%%%
%%%------------------------------------------------------------------------
%%% @doc
%%% ==CloudI Response==
%%% Response format transform.
%%% @end
%%%
%%% BSD LICENSE
%%% 
%%% Copyright (c) 2011-2016, Michael Truog <mjtruog at gmail dot com>
%%% All rights reserved.
%%% 
%%% Redistribution and use in source and binary forms, with or without
%%% modification, are permitted provided that the following conditions are met:
%%% 
%%%     * Redistributions of source code must retain the above copyright
%%%       notice, this list of conditions and the following disclaimer.
%%%     * Redistributions in binary form must reproduce the above copyright
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%%%       the documentation and/or other materials provided with the
%%%       distribution.
%%%     * All advertising materials mentioning features or use of this
%%%       software must display the following acknowledgment:
%%%         This product includes software developed by Michael Truog
%%%     * The name of the author may not be used to endorse or promote
%%%       products derived from this software without specific prior
%%%       written permission
%%% 
%%% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
%%% CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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%%% @author Michael Truog <mjtruog [at] gmail (dot) com>
%%% @copyright 2011-2016 Michael Truog
%%% @version 1.5.2 {@date} {@time}
%%%------------------------------------------------------------------------

-module(cloudi_response).
-author('mjtruog [at] gmail (dot) com').

%% external interface
-export([external_format/2]).

-include("cloudi_core_i_constants.hrl").

%%%------------------------------------------------------------------------
%%% External interface functions
%%%------------------------------------------------------------------------

%%-------------------------------------------------------------------------
%% @doc
%% ===Encode outgoing external response data.===
%% @end
%%-------------------------------------------------------------------------

-spec external_format(Response :: any(),
                      Format :: cloudi_request:external_format()) ->
    binary().

external_format(Response, Format) ->
    if
        Format =:= erlang_string ->
            cloudi_string:term_to_binary(Response);
        Format =:= erlang_term ->
            erlang:term_to_binary(Response);
        Format =:= msgpack ->
            Outgoing = msgpack:
                       pack(msgpack_response(Response),
                            [{map_format, ?MSGPACK_MAP}]),
            true = is_binary(Outgoing),
            Outgoing
    end.

%%%------------------------------------------------------------------------
%%% Private functions
%%%------------------------------------------------------------------------

msgpack_response(E)
    when is_atom(E) ->
    erlang:atom_to_binary(E, utf8);
msgpack_response(T)
    when is_tuple(T) ->
    [msgpack_response(E) || E <- erlang:tuple_to_list(T)];
msgpack_response(L)
    when is_list(L) ->
    [msgpack_response(E) || E <- L];
msgpack_response(E) ->
    E.