%%%----------------------------------------------------------------------
%%% File : ejabberd.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : ejabberd wrapper: start / stop
%%% Created : 16 Nov 2002 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2015 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License along
%%% with this program; if not, write to the Free Software Foundation, Inc.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%----------------------------------------------------------------------
-module(ejabberd).
-author('alexey@process-one.net').
-protocol({xep, 4, '2.9'}).
-protocol({xep, 86, '1.0'}).
-protocol({xep, 106, '1.1'}).
-protocol({xep, 170, '1.0'}).
-protocol({xep, 205, '1.0'}).
-protocol({xep, 212, '1.0'}).
-protocol({xep, 216, '1.0'}).
-protocol({xep, 243, '1.0'}).
-protocol({xep, 270, '1.0'}).
-export([start/0, stop/0, start_app/1, start_app/2,
get_pid_file/0, check_app/1]).
-include("logger.hrl").
start() ->
%%ejabberd_cover:start(),
application:start(ejabberd).
stop() ->
application:stop(ejabberd).
%%ejabberd_cover:stop().
%% @spec () -> false | string()
get_pid_file() ->
case os:getenv("EJABBERD_PID_PATH") of
false ->
false;
"" ->
false;
Path ->
Path
end.
start_app(App) ->
start_app(App, temporary).
start_app(App, Type) ->
StartFlag = not is_loaded(),
start_app(App, Type, StartFlag).
check_app(App) ->
StartFlag = not is_loaded(),
spawn(fun() -> check_app_modules(App, StartFlag) end),
ok.
is_loaded() ->
Apps = application:which_applications(),
lists:keymember(ejabberd, 1, Apps).
start_app(App, Type, StartFlag) when not is_list(App) ->
start_app([App], Type, StartFlag);
start_app([App|Apps], Type, StartFlag) ->
case application:start(App) of
ok ->
spawn(fun() -> check_app_modules(App, StartFlag) end),
start_app(Apps, Type, StartFlag);
{error, {already_started, _}} ->
start_app(Apps, Type, StartFlag);
{error, {not_started, DepApp}} ->
case lists:member(DepApp, [App|Apps]) of
true ->
Reason = io_lib:format(
"failed to start application '~p': "
"circular dependency on '~p' detected",
[App, DepApp]),
exit_or_halt(Reason, StartFlag);
false ->
start_app([DepApp,App|Apps], Type, StartFlag)
end;
Err ->
Reason = io_lib:format("failed to start application '~p': ~p",
[App, Err]),
exit_or_halt(Reason, StartFlag)
end;
start_app([], _Type, _StartFlag) ->
ok.
check_app_modules(App, StartFlag) ->
{A, B, C} = now(),
random:seed(A, B, C),
sleep(5000),
case application:get_key(App, modules) of
{ok, Mods} ->
lists:foreach(
fun(Mod) ->
case code:which(Mod) of
non_existing ->
File = get_module_file(App, Mod),
Reason = io_lib:format(
"couldn't find module ~s "
"needed for application '~p'",
[File, App]),
exit_or_halt(Reason, StartFlag);
_ ->
sleep(10)
end
end, Mods);
_ ->
%% No modules? This is strange
ok
end.
exit_or_halt(Reason, StartFlag) ->
?CRITICAL_MSG(Reason, []),
if StartFlag ->
%% Wait for the critical message is written in the console/log
timer:sleep(1000),
halt(string:substr(lists:flatten(Reason), 1, 199));
true ->
erlang:error(application_start_failed)
end.
sleep(N) ->
timer:sleep(random:uniform(N)).
get_module_file(App, Mod) ->
BaseName = atom_to_list(Mod),
case code:lib_dir(App, ebin) of
{error, _} ->
BaseName;
Dir ->
filename:join([Dir, BaseName ++ ".beam"])
end.
