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%%%-------------------------------------------------------------------
%% @copyright {{copyright_holder}} ({{copyright_year}})
%% @author {{author_name}} <{{author_email}}>
%% @doc {{appid}} OTP application callback module.
%% @end
%%%-------------------------------------------------------------------
-module({{appid}}_app).
-behaviour(application).
-define(APP, {{appid}}).
%% Application callbacks
-export([start_phase/3, start/2, stop/1]).
-export([config/0, config/1, config/2,
start/0, a_start/2]).
%%%===================================================================
%%% Convenience Functions
%%%===================================================================
start() ->
a_start(?APP, permanent).
config(Key, Default) ->
case application:get_env(?APP, Key) of
undefined -> Default;
{ok, Val} -> Val
end.
config(Key) ->
case application:get_env(?APP, Key) of
undefined -> erlang:error({missing_config, Key});
{ok, Val} -> Val
end.
config() ->
application:get_all_env(?APP).
%% ===================================================================
%% Application callbacks
%% ===================================================================
start(_StartType, _StartArgs) ->
{{appid}}_sup:start_link().
stop(_State) ->
ok.
start_phase(listen, _Type, _Args) ->
Dispatch = [{'_',
[{'_', {{app}}_http_handler, []}]}
],
cowboy:start_listener(http, 100,
cowboy_tcp_transport,
[{port, config(http_listen_port)}],
cowboy_http_protocol,
[{dispatch, Dispatch}]),
ok.
%%%===================================================================
%%% Internal functions
%%%===================================================================
a_start(App, Type) ->
start_ok(App, Type, application:start(App, Type)).
start_ok(_App, _Type, ok) -> ok;
start_ok(_App, _Type, {error, {already_started, _App}}) -> ok;
start_ok(App, Type, {error, {not_started, Dep}}) ->
ok = a_start(Dep, Type),
a_start(App, Type);
start_ok(App, _Type, {error, Reason}) ->
erlang:error({app_start_failed, App, Reason}).
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