%%%----------------------------------------------------------------------
%%% File : gen_mod.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose :
%%% Created : 24 Jan 2003 by Alexey Shchepin <alexey@sevcom.net>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(gen_mod).
-author('alexey@sevcom.net').
-vsn('$Revision$ ').
-export([start/0,
start_module/3,
stop_module/2,
get_opt/2,
get_opt/3,
get_module_opt/4,
loaded_modules/1,
loaded_modules_with_opts/1,
get_hosts/2,
get_module_proc/2,
is_loaded/2]).
-export([behaviour_info/1]).
-include("ejabberd.hrl").
-record(ejabberd_module, {module_host, opts}).
behaviour_info(callbacks) ->
[{start, 2},
{stop, 1}];
behaviour_info(_Other) ->
undefined.
start() ->
ets:new(ejabberd_modules, [named_table,
public,
{keypos, #ejabberd_module.module_host}]),
ok.
start_module(Host, Module, Opts) ->
case catch Module:start(Host, Opts) of
{'EXIT', Reason} ->
?ERROR_MSG("~p", [Reason]);
_ ->
ets:insert(ejabberd_modules,
#ejabberd_module{module_host = {Module, Host},
opts = Opts}),
ok
end.
stop_module(Host, Module) ->
case catch Module:stop(Host) of
{'EXIT', Reason} ->
?ERROR_MSG("~p", [Reason]);
{wait, ProcList} when is_list(ProcList) ->
lists:foreach(fun wait_for_process/1, ProcList),
ets:delete(ejabberd_modules, {Module, Host}),
ok;
{wait, Process} ->
wait_for_process(Process),
ets:delete(ejabberd_modules, {Module, Host}),
ok;
_ ->
ets:delete(ejabberd_modules, {Module, Host}),
ok
end.
wait_for_process(Process) ->
MonitorReference = erlang:monitor(process, Process),
wait_for_stop(Process, MonitorReference).
wait_for_stop(Process, MonitorReference) ->
receive
{'DOWN', MonitorReference, _Type, _Object, _Info} ->
ok
after 5000 ->
catch exit(whereis(Process), kill),
wait_for_stop1(MonitorReference)
end.
wait_for_stop1(MonitorReference) ->
receive
{'DOWN', MonitorReference, _Type, _Object, _Info} ->
ok
after 5000 ->
ok
end.
get_opt(Opt, Opts) ->
case lists:keysearch(Opt, 1, Opts) of
false ->
% TODO: replace with more appropriate function
[] = {undefined_option, Opt};
{value, {_, Val}} ->
Val
end.
get_opt(Opt, Opts, Default) ->
case lists:keysearch(Opt, 1, Opts) of
false ->
Default;
{value, {_, Val}} ->
Val
end.
get_module_opt(Host, Module, Opt, Default) ->
OptsList = ets:lookup(ejabberd_modules, {Module, Host}),
case OptsList of
[] ->
Default;
[#ejabberd_module{opts = Opts} | _] ->
get_opt(Opt, Opts, Default)
end.
loaded_modules(Host) ->
ets:select(ejabberd_modules,
[{#ejabberd_module{_ = '_', module_host = {'$1', Host}},
[],
['$1']}]).
loaded_modules_with_opts(Host) ->
ets:select(ejabberd_modules,
[{#ejabberd_module{_ = '_', module_host = {'$1', Host},
opts = '$2'},
[],
[{{'$1', '$2'}}]}]).
get_hosts(Opts, Prefix) ->
case catch gen_mod:get_opt(hosts, Opts) of
{'EXIT', _Error1} ->
case catch gen_mod:get_opt(host, Opts) of
{'EXIT', _Error2} ->
[Prefix ++ Host || Host <- ?MYHOSTS];
Host ->
[Host]
end;
Hosts ->
Hosts
end.
get_module_proc(Host, Base) ->
list_to_atom(atom_to_list(Base) ++ "_" ++ Host).
is_loaded(Host, Module) ->
ets:member(ejabberd_modules, {Module, Host}).
