mirror of
https://github.com/processone/ejabberd.git
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247 lines
8.1 KiB
Erlang
247 lines
8.1 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : mod_ping.erl
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%%% Author : Brian Cully <bjc@kublai.com>
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%%% Purpose : Support XEP-0199 XMPP Ping and periodic keepalives
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%%% Created : 11 Jul 2009 by Brian Cully <bjc@kublai.com>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2014 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 along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%----------------------------------------------------------------------
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-module(mod_ping).
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-author('bjc@kublai.com').
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-behavior(gen_mod).
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-behavior(gen_server).
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-include("ejabberd.hrl").
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-include("logger.hrl").
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-include("jlib.hrl").
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-define(SUPERVISOR, ejabberd_sup).
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-define(DEFAULT_SEND_PINGS, false).
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-define(DEFAULT_PING_INTERVAL, 60).
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-define(DICT, dict).
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%% API
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-export([start_link/2, start_ping/2, stop_ping/2]).
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%% gen_mod callbacks
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-export([start/2, stop/1]).
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%% gen_server callbacks
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-export([init/1, terminate/2, handle_call/3,
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handle_cast/2, handle_info/2, code_change/3]).
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%% Hook callbacks
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-export([iq_ping/3, user_online/3, user_offline/3,
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user_send/3]).
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-record(state,
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{host = <<"">>,
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send_pings = ?DEFAULT_SEND_PINGS :: boolean(),
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ping_interval = ?DEFAULT_PING_INTERVAL :: non_neg_integer(),
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timeout_action = none :: none | kill,
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timers = (?DICT):new() :: dict()}).
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%%====================================================================
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%% API
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%%====================================================================
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start_link(Host, Opts) ->
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Proc = gen_mod:get_module_proc(Host, ?MODULE),
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gen_server:start_link({local, Proc}, ?MODULE,
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[Host, Opts], []).
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start_ping(Host, JID) ->
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Proc = gen_mod:get_module_proc(Host, ?MODULE),
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gen_server:cast(Proc, {start_ping, JID}).
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stop_ping(Host, JID) ->
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Proc = gen_mod:get_module_proc(Host, ?MODULE),
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gen_server:cast(Proc, {stop_ping, JID}).
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%%====================================================================
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%% gen_mod callbacks
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%%====================================================================
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start(Host, Opts) ->
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Proc = gen_mod:get_module_proc(Host, ?MODULE),
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PingSpec = {Proc, {?MODULE, start_link, [Host, Opts]},
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transient, 2000, worker, [?MODULE]},
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supervisor:start_child(?SUPERVISOR, PingSpec).
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stop(Host) ->
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Proc = gen_mod:get_module_proc(Host, ?MODULE),
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gen_server:call(Proc, stop),
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supervisor:delete_child(?SUPERVISOR, Proc).
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%%====================================================================
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%% gen_server callbacks
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%%====================================================================
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init([Host, Opts]) ->
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SendPings = gen_mod:get_opt(send_pings, Opts,
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fun(B) when is_boolean(B) -> B end,
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?DEFAULT_SEND_PINGS),
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PingInterval = gen_mod:get_opt(ping_interval, Opts,
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fun(I) when is_integer(I), I>0 -> I end,
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?DEFAULT_PING_INTERVAL),
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TimeoutAction = gen_mod:get_opt(timeout_action, Opts,
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fun(none) -> none;
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(kill) -> kill
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end, none),
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IQDisc = gen_mod:get_opt(iqdisc, Opts, fun gen_iq_handler:check_type/1,
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no_queue),
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mod_disco:register_feature(Host, ?NS_PING),
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gen_iq_handler:add_iq_handler(ejabberd_sm, Host,
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?NS_PING, ?MODULE, iq_ping, IQDisc),
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gen_iq_handler:add_iq_handler(ejabberd_local, Host,
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?NS_PING, ?MODULE, iq_ping, IQDisc),
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case SendPings of
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true ->
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ejabberd_hooks:add(sm_register_connection_hook, Host,
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?MODULE, user_online, 100),
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ejabberd_hooks:add(sm_remove_connection_hook, Host,
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?MODULE, user_offline, 100),
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ejabberd_hooks:add(user_send_packet, Host, ?MODULE,
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user_send, 100);
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_ -> ok
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end,
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{ok,
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#state{host = Host, send_pings = SendPings,
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ping_interval = PingInterval,
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timeout_action = TimeoutAction,
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timers = (?DICT):new()}}.
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terminate(_Reason, #state{host = Host}) ->
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ejabberd_hooks:delete(sm_remove_connection_hook, Host,
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?MODULE, user_offline, 100),
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ejabberd_hooks:delete(sm_register_connection_hook, Host,
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?MODULE, user_online, 100),
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ejabberd_hooks:delete(user_send_packet, Host, ?MODULE,
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user_send, 100),
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gen_iq_handler:remove_iq_handler(ejabberd_local, Host,
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?NS_PING),
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gen_iq_handler:remove_iq_handler(ejabberd_sm, Host,
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?NS_PING),
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mod_disco:unregister_feature(Host, ?NS_PING).
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handle_call(stop, _From, State) ->
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{stop, normal, ok, State};
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handle_call(_Req, _From, State) ->
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{reply, {error, badarg}, State}.
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handle_cast({start_ping, JID}, State) ->
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Timers = add_timer(JID, State#state.ping_interval,
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State#state.timers),
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{noreply, State#state{timers = Timers}};
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handle_cast({stop_ping, JID}, State) ->
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Timers = del_timer(JID, State#state.timers),
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{noreply, State#state{timers = Timers}};
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handle_cast({iq_pong, JID, timeout}, State) ->
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Timers = del_timer(JID, State#state.timers),
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ejabberd_hooks:run(user_ping_timeout, State#state.host,
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[JID]),
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case State#state.timeout_action of
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kill ->
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#jid{user = User, server = Server,
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resource = Resource} =
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JID,
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case ejabberd_sm:get_session_pid(User, Server, Resource)
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of
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Pid when is_pid(Pid) -> ejabberd_c2s:stop(Pid);
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_ -> ok
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end;
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_ -> ok
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end,
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{noreply, State#state{timers = Timers}};
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handle_cast(_Msg, State) -> {noreply, State}.
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handle_info({timeout, _TRef, {ping, JID}}, State) ->
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IQ = #iq{type = get,
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sub_el =
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[#xmlel{name = <<"ping">>,
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attrs = [{<<"xmlns">>, ?NS_PING}], children = []}]},
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Pid = self(),
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F = fun (Response) ->
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gen_server:cast(Pid, {iq_pong, JID, Response})
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end,
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From = jlib:make_jid(<<"">>, State#state.host, <<"">>),
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ejabberd_local:route_iq(From, JID, IQ, F),
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Timers = add_timer(JID, State#state.ping_interval,
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State#state.timers),
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{noreply, State#state{timers = Timers}};
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handle_info(_Info, State) -> {noreply, State}.
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code_change(_OldVsn, State, _Extra) -> {ok, State}.
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%%====================================================================
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%% Hook callbacks
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%%====================================================================
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iq_ping(_From, _To,
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#iq{type = Type, sub_el = SubEl} = IQ) ->
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case {Type, SubEl} of
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{get, #xmlel{name = <<"ping">>}} ->
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IQ#iq{type = result, sub_el = []};
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_ ->
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IQ#iq{type = error,
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sub_el = [SubEl, ?ERR_FEATURE_NOT_IMPLEMENTED]}
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end.
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user_online(_SID, JID, _Info) ->
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start_ping(JID#jid.lserver, JID).
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user_offline(_SID, JID, _Info) ->
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stop_ping(JID#jid.lserver, JID).
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user_send(JID, _From, _Packet) ->
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start_ping(JID#jid.lserver, JID).
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%%====================================================================
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%% Internal functions
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%%====================================================================
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add_timer(JID, Interval, Timers) ->
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LJID = jlib:jid_tolower(JID),
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NewTimers = case (?DICT):find(LJID, Timers) of
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{ok, OldTRef} ->
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cancel_timer(OldTRef), (?DICT):erase(LJID, Timers);
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_ -> Timers
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end,
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TRef = erlang:start_timer(Interval * 1000, self(),
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{ping, JID}),
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(?DICT):store(LJID, TRef, NewTimers).
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del_timer(JID, Timers) ->
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LJID = jlib:jid_tolower(JID),
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case (?DICT):find(LJID, Timers) of
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{ok, TRef} ->
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cancel_timer(TRef), (?DICT):erase(LJID, Timers);
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_ -> Timers
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end.
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cancel_timer(TRef) ->
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case erlang:cancel_timer(TRef) of
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false ->
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receive {timeout, TRef, _} -> ok after 0 -> ok end;
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_ -> ok
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end.
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