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shackle

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High-Performance Erlang Network Client Framework

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shackle src shackle_udp.erl
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src/shackle_udp.erl 

-module(shackle_udp).

-include("shackle_internal.hrl").



-compile(inline).

-compile({inline_size, 512}).



-export([

    close/1,

    header/2,

    new/3,

    send/3

]).



-define(INET_AF_INET, 1).

-define(INT16(X), [((X) bsr 8) band 16#ff, (X) band 16#ff]).



%% public

-spec close(inet:socket()) ->

    ok.



close(Socket) ->

    gen_udp:close(Socket).



-spec header(inet:ip_address(), inet:port_number()) -> iodata().



-ifdef(UDP_HEADER).



header(IP, Port) ->

    [?INET_AF_INET, ?INT16(Port) | ip4_to_bytes(IP)].



-else.



header(IP, Port) ->

    [?INT16(Port) | ip4_to_bytes(IP)].



-endif.



-spec new(inet:ip_address(), inet:port_number(), [gen_udp:option()]) ->

    {ok, inet:socket()} | {error, term()}.



new(_Ip, _Port, Options) ->

    gen_udp:open(0, Options).



-spec send(inet:socket(), iodata(), iodata()) ->

    ok | {error, term()}.



send(Socket, Header, Data) ->

    try

        true = erlang:port_command(Socket, [Header, Data]),

        ok

    catch

        Error:Reason ->

            {error, {Error, Reason}}

    end.



%% private

ip4_to_bytes({A, B, C, D}) ->

    [A band 16#ff, B band 16#ff, C band 16#ff, D band 16#ff].