echo.erl

%% Copyright (c) 2010-2013, Michael Santos <michael.santos@gmail.com>
%% All rights reserved.
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%% modification, are permitted provided that the following conditions
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%% notice, this list of conditions and the following disclaimer.
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%% procket test client
-module(echo).

-export([start/0,start/1,start/2]).

-define(PORT, 54).

start() ->
    start(tcp).
start(tcp) ->
    start(?PORT, [{protocol, tcp}, {family, inet}, {type, stream}]);
start(udp) ->
    start(?PORT, [{protocol, udp}, {family, inet}, {type, dgram}]).
start(Port, Options) ->
    Protocol = proplists:get_value(protocol, Options, tcp),
    Family = proplists:get_value(family, Options, inet),
    {ok, Fd} = procket:open(Port, Options),
    io:format("Listening on: ~p/~p~n", [Port, Protocol]),
    listen(Protocol, Family, Fd).

listen(tcp, Family, Fd) ->
    {ok, S} = gen_tcp:listen(0, [binary, Family, {fd, Fd}]),
    accept(S);
listen(udp, Family, Fd) ->
    {ok, S} = gen_udp:open(0, [binary, Family, {fd, Fd}]),
    recv(S).

accept(LS) ->
    {ok, S} = gen_tcp:accept(LS),
    spawn(fun() -> accept(LS) end),
    recv(S).

recv(S) ->
    receive
        {tcp, S, Data} ->
            gen_tcp:send(S, Data),
            recv(S);
        {tcp_closed, S} ->
            ok;
        {udp, S, IP, Port, Data} ->
            gen_udp:send(S, IP, Port, Data),
            recv(S);
        Error ->
            error_logger:error_report({recv, Error})
    end.