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erldns

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Erlang Authoritative DNS Server

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erldns src erldns_config.erl
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src/erldns_config.erl 

-module(erldns_config).

-moduledoc "Provide application-wide configuration access.".



-export([

    use_root_hints/0,

    ingress_udp_request_timeout/0,

    ingress_tcp_request_timeout/0

]).



-define(DEFAULT_UDP_PROCESS_TIMEOUT, 500).

-define(DEFAULT_TCP_PROCESS_TIMEOUT, 1000).



-doc "Use IANA DNS root servers as hints".

-spec use_root_hints() -> boolean().

use_root_hints() ->

    case application:get_env(erldns, use_root_hints) of

        {ok, Flag} when is_boolean(Flag) ->

            Flag;

        _ ->

            true

    end.



-doc "Timeout in milliseconds before which an UDP request must be completed.".

-spec ingress_udp_request_timeout() -> non_neg_integer().

ingress_udp_request_timeout() ->

    case application:get_env(erldns, ingress_udp_request_timeout) of

        {ok, UdpTimeout} when is_integer(UdpTimeout), 0 =< UdpTimeout ->

            UdpTimeout;

        _ ->

            ?DEFAULT_UDP_PROCESS_TIMEOUT

    end.



-doc "Timeout in milliseconds before which a TCP request must be completed.".

-spec ingress_tcp_request_timeout() -> non_neg_integer().

ingress_tcp_request_timeout() ->

    case application:get_env(erldns, ingress_tcp_request_timeout) of

        {ok, TcpTimeout} when is_integer(TcpTimeout), 0 =< TcpTimeout ->

            TcpTimeout;

        _ ->

            ?DEFAULT_TCP_PROCESS_TIMEOUT

    end.