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Erlang Authoritative DNS Server

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erldns src erldns_zone_loader.erl
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src/erldns_zone_loader.erl 

%% Copyright (c) 2012-2018, DNSimple Corporation

%%

%% Permission to use, copy, modify, and/or distribute this software for any

%% purpose with or without fee is hereby granted, provided that the above

%% copyright notice and this permission notice appear in all copies.

%%

%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.



%% @doc Funcions for loading zones from local or remote sources.

-module(erldns_zone_loader).



-export([load_zones/0]).



-define(FILENAME, "zones.json").



% Public API



%% @doc Load zones from a file. The default file name is "zones.json".

-spec load_zones() -> {ok, integer()} | {err,  atom()}.

load_zones() ->

  case file:read_file(filename()) of

    {ok, Binary} ->

      lager:debug("Parsing zones JSON"),

      JsonZones = jsx:decode(Binary),

      lager:debug("Putting zones into cache"),

      lists:foreach(

        fun(JsonZone) ->

            Zone = erldns_zone_parser:zone_to_erlang(JsonZone),

            case erldns_zone_cache:put_zone(Zone) of

              {error, Reason} -> lager:error("Failed to load zone (reason: ~p)", [JsonZone, Reason]);

              _ -> ok

            end

        end, JsonZones),

      lager:info("Loaded zones (count: ~p)", [length(JsonZones)]),

      {ok, length(JsonZones)};

    {error, Reason} ->

      lager:error("Failed to load zones (reason: ~p)", [Reason]),

      {err, Reason}

  end.



% Internal API

filename() ->

  case application:get_env(erldns, zones) of

    {ok, Filename} -> Filename;

    _ -> ?FILENAME

  end.