mirror of
https://github.com/processone/ejabberd.git
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263 lines
8.0 KiB
Erlang
263 lines
8.0 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : gen_mod.erl
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose :
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%%% Purpose :
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%%% Created : 24 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2013 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License
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%%% along with this program; if not, write to the Free Software
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%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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%%% 02111-1307 USA
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%%%
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%%%----------------------------------------------------------------------
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-module(gen_mod).
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-author('alexey@process-one.net').
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-export([start/0, start_module/3, stop_module/2,
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stop_module_keep_config/2, get_opt/3, get_opt/4,
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get_opt_host/3, db_type/1, db_type/2, get_module_opt/5,
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get_module_opt_host/3, loaded_modules/1,
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loaded_modules_with_opts/1, get_hosts/2,
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get_module_proc/2, is_loaded/2]).
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%%-export([behaviour_info/1]).
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-include("ejabberd.hrl").
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-include("logger.hrl").
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-record(ejabberd_module,
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{module_host = {undefined, <<"">>} :: {atom(), binary()},
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opts = [] :: opts() | '_' | '$2'}).
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-type opts() :: [{atom(), any()}].
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-callback start(binary(), opts()) -> any().
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-callback stop(binary()) -> any().
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-export_type([opts/0]).
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%%behaviour_info(callbacks) -> [{start, 2}, {stop, 1}];
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%%behaviour_info(_Other) -> undefined.
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start() ->
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ets:new(ejabberd_modules,
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[named_table, public,
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{keypos, #ejabberd_module.module_host}]),
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ok.
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-spec start_module(binary(), atom(), opts()) -> any().
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start_module(Host, Module, Opts) ->
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ets:insert(ejabberd_modules,
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#ejabberd_module{module_host = {Module, Host},
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opts = Opts}),
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try Module:start(Host, Opts) catch
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Class:Reason ->
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ets:delete(ejabberd_modules, {Module, Host}),
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ErrorText =
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io_lib:format("Problem starting the module ~p for host "
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"~p ~n options: ~p~n ~p: ~p~n~p",
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[Module, Host, Opts, Class, Reason,
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erlang:get_stacktrace()]),
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?CRITICAL_MSG(ErrorText, []),
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case is_app_running(ejabberd) of
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true ->
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erlang:raise(Class, Reason, erlang:get_stacktrace());
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false ->
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?CRITICAL_MSG("ejabberd initialization was aborted "
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"because a module start failed.",
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[]),
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timer:sleep(3000),
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erlang:halt(string:substr(lists:flatten(ErrorText), 1, 199))
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end
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end.
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is_app_running(AppName) ->
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Timeout = 15000,
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lists:keymember(AppName, 1,
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application:which_applications(Timeout)).
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-spec stop_module(binary(), atom()) -> error | {aborted, any()} | {atomic, any()}.
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%% @doc Stop the module in a host, and forget its configuration.
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stop_module(Host, Module) ->
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case stop_module_keep_config(Host, Module) of
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error -> error;
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ok -> ok
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end.
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%% @doc Stop the module in a host, but keep its configuration.
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%% As the module configuration is kept in the Mnesia local_config table,
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%% when ejabberd is restarted the module will be started again.
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%% This function is useful when ejabberd is being stopped
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%% and it stops all modules.
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-spec stop_module_keep_config(binary(), atom()) -> error | ok.
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stop_module_keep_config(Host, Module) ->
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case catch Module:stop(Host) of
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{'EXIT', Reason} -> ?ERROR_MSG("~p", [Reason]), error;
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{wait, ProcList} when is_list(ProcList) ->
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lists:foreach(fun wait_for_process/1, ProcList),
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ets:delete(ejabberd_modules, {Module, Host}),
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ok;
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{wait, Process} ->
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wait_for_process(Process),
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ets:delete(ejabberd_modules, {Module, Host}),
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ok;
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_ -> ets:delete(ejabberd_modules, {Module, Host}), ok
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end.
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wait_for_process(Process) ->
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MonitorReference = erlang:monitor(process, Process),
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wait_for_stop(Process, MonitorReference).
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wait_for_stop(Process, MonitorReference) ->
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receive
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{'DOWN', MonitorReference, _Type, _Object, _Info} -> ok
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after 5000 ->
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catch exit(whereis(Process), kill),
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wait_for_stop1(MonitorReference)
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end.
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wait_for_stop1(MonitorReference) ->
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receive
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{'DOWN', MonitorReference, _Type, _Object, _Info} -> ok
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after 5000 -> ok
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end.
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-type check_fun() :: fun((any()) -> any()) | {module(), atom()}.
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-spec get_opt(atom(), opts(), check_fun()) -> any().
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get_opt(Opt, Opts, F) ->
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get_opt(Opt, Opts, F, undefined).
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-spec get_opt(atom(), opts(), check_fun(), any()) -> any().
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get_opt(Opt, Opts, F, Default) ->
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case lists:keysearch(Opt, 1, Opts) of
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false ->
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Default;
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{value, {_, Val}} ->
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ejabberd_config:prepare_opt_val(Opt, Val, F, Default)
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end.
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-spec get_module_opt(global | binary(), atom(), atom(), check_fun(), any()) -> any().
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get_module_opt(global, Module, Opt, F, Default) ->
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Hosts = (?MYHOSTS),
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[Value | Values] = lists:map(fun (Host) ->
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get_module_opt(Host, Module, Opt,
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F, Default)
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end,
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Hosts),
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Same_all = lists:all(fun (Other_value) ->
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Other_value == Value
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end,
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Values),
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case Same_all of
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true -> Value;
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false -> Default
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end;
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get_module_opt(Host, Module, Opt, F, Default) ->
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OptsList = ets:lookup(ejabberd_modules, {Module, Host}),
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case OptsList of
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[] -> Default;
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[#ejabberd_module{opts = Opts} | _] ->
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get_opt(Opt, Opts, F, Default)
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end.
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-spec get_module_opt_host(global | binary(), atom(), binary()) -> binary().
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get_module_opt_host(Host, Module, Default) ->
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Val = get_module_opt(Host, Module, host,
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fun iolist_to_binary/1,
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Default),
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ejabberd_regexp:greplace(Val, <<"@HOST@">>, Host).
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-spec get_opt_host(binary(), opts(), binary()) -> binary().
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get_opt_host(Host, Opts, Default) ->
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Val = get_opt(host, Opts, fun iolist_to_binary/1, Default),
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ejabberd_regexp:greplace(Val, <<"@HOST@">>, Host).
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-spec db_type(opts()) -> odbc | mnesia.
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db_type(Opts) ->
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get_opt(db_type, Opts,
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fun(odbc) -> odbc;
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(internal) -> mnesia;
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(mnesia) -> mnesia end,
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mnesia).
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-spec db_type(binary(), atom()) -> odbc | mnesia.
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db_type(Host, Module) ->
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get_module_opt(Host, Module, db_type,
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fun(odbc) -> odbc;
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(internal) -> mnesia;
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(mnesia) -> mnesia end,
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mnesia).
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-spec loaded_modules(binary()) -> [atom()].
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loaded_modules(Host) ->
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ets:select(ejabberd_modules,
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[{#ejabberd_module{_ = '_', module_host = {'$1', Host}},
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[], ['$1']}]).
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-spec loaded_modules_with_opts(binary()) -> [{atom(), opts()}].
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loaded_modules_with_opts(Host) ->
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ets:select(ejabberd_modules,
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[{#ejabberd_module{_ = '_', module_host = {'$1', Host},
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opts = '$2'},
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[], [{{'$1', '$2'}}]}]).
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-spec get_hosts(opts(), binary()) -> [binary()].
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get_hosts(Opts, Prefix) ->
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case get_opt(hosts, Opts,
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fun(Hs) -> [iolist_to_binary(H) || H <- Hs] end) of
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undefined ->
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case get_opt(host, Opts,
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fun iolist_to_binary/1) of
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undefined ->
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[<<Prefix/binary, Host/binary>> || Host <- ?MYHOSTS];
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Host ->
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[Host]
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end;
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Hosts ->
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Hosts
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end.
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-spec get_module_proc(binary(), {frontend, atom()} | atom()) -> atom().
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get_module_proc(Host, {frontend, Base}) ->
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get_module_proc(<<"frontend_", Host/binary>>, Base);
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get_module_proc(Host, Base) ->
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binary_to_atom(
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<<(erlang:atom_to_binary(Base, latin1))/binary, "_", Host/binary>>,
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latin1).
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-spec is_loaded(binary(), atom()) -> boolean().
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is_loaded(Host, Module) ->
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ets:member(ejabberd_modules, {Module, Host}).
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