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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) 2012-2020, 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 Functions for loading zones from local or remote sources.

-module(erldns_zone_loader).



-export([load_zones/0]).



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



-ifdef(TEST).



-include_lib("eunit/include/eunit.hrl").



-endif.



% 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:info("Parsing zones JSON"),

            JsonZones = json:decode(Binary),

            lager:info("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} -> erldns_events:notify({?MODULE, put_zone_error, {JsonZone, Reason}});

                        _ -> ok

                    end

                end,

                JsonZones

            ),

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

            {ok, length(JsonZones)};

        {error, Reason} ->

            erldns_events:notify({?MODULE, read_file_error, Reason}),

            {err, Reason}

    end.



% Internal API

filename() ->

    case application:get_env(erldns, zones) of

        {ok, Filename} ->

            Filename;

        _ ->

            ?FILENAME

    end.