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mirror of https://github.com/processone/ejabberd.git synced 2024-12-22 17:28:25 +01:00
xmpp.chapril.org-ejabberd/src/mod_last.erl
Evgeniy Khramtsov 66fc1bf3b6 Remove 'iqdisc' option
Since we got rid of all bottle-neck processes and we have
a connection pool for every database, the option is no longer
needed and in fact is detrimental: in practice what you get
is just a bunch of overloaded processes in the IQ handlers pool
no matter how much you increase the `iqdisc` value.

Given that there are close to zero operators understanding
the meaning of the option and, hence, not using it all,
it's not simply deprecated but completely removed.

The commit also deprecates the following functions:
- gen_iq_handler:add_iq_handler/6
- gen_iq_handler:handle/5
- gen_iq_handler:iqdisc/1
2018-02-11 12:54:15 +03:00

337 lines
11 KiB
Erlang

%%%----------------------------------------------------------------------
%%% File : mod_last.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : jabber:iq:last support (XEP-0012)
%%% Created : 24 Oct 2003 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2018 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(mod_last).
-author('alexey@process-one.net').
-protocol({xep, 12, '2.0'}).
-behaviour(gen_mod).
-export([start/2, stop/1, reload/3, process_local_iq/1, export/1,
process_sm_iq/1, on_presence_update/4, import_info/0,
import/5, import_start/2, store_last_info/4, get_last_info/2,
remove_user/2, mod_opt_type/1, mod_options/1,
register_user/2, depends/2, privacy_check_packet/4]).
-include("ejabberd.hrl").
-include("logger.hrl").
-include("xmpp.hrl").
-include("mod_privacy.hrl").
-include("mod_last.hrl").
-define(LAST_CACHE, last_activity_cache).
-callback init(binary(), gen_mod:opts()) -> any().
-callback import(binary(), #last_activity{}) -> ok | pass.
-callback get_last(binary(), binary()) ->
{ok, {non_neg_integer(), binary()}} | error | {error, any()}.
-callback store_last_info(binary(), binary(), non_neg_integer(), binary()) -> ok | {error, any()}.
-callback remove_user(binary(), binary()) -> any().
-callback use_cache(binary()) -> boolean().
-callback cache_nodes(binary()) -> [node()].
-optional_callbacks([use_cache/1, cache_nodes/1]).
start(Host, Opts) ->
Mod = gen_mod:db_mod(Host, Opts, ?MODULE),
Mod:init(Host, Opts),
init_cache(Mod, Host, Opts),
gen_iq_handler:add_iq_handler(ejabberd_local, Host,
?NS_LAST, ?MODULE, process_local_iq),
gen_iq_handler:add_iq_handler(ejabberd_sm, Host,
?NS_LAST, ?MODULE, process_sm_iq),
ejabberd_hooks:add(privacy_check_packet, Host, ?MODULE,
privacy_check_packet, 30),
ejabberd_hooks:add(register_user, Host, ?MODULE,
register_user, 50),
ejabberd_hooks:add(remove_user, Host, ?MODULE,
remove_user, 50),
ejabberd_hooks:add(unset_presence_hook, Host, ?MODULE,
on_presence_update, 50).
stop(Host) ->
ejabberd_hooks:delete(register_user, Host, ?MODULE,
register_user, 50),
ejabberd_hooks:delete(remove_user, Host, ?MODULE,
remove_user, 50),
ejabberd_hooks:delete(unset_presence_hook, Host,
?MODULE, on_presence_update, 50),
ejabberd_hooks:delete(privacy_check_packet, Host, ?MODULE,
privacy_check_packet, 30),
gen_iq_handler:remove_iq_handler(ejabberd_local, Host,
?NS_LAST),
gen_iq_handler:remove_iq_handler(ejabberd_sm, Host,
?NS_LAST).
reload(Host, NewOpts, OldOpts) ->
NewMod = gen_mod:db_mod(Host, NewOpts, ?MODULE),
OldMod = gen_mod:db_mod(Host, OldOpts, ?MODULE),
if NewMod /= OldMod ->
NewMod:init(Host, NewOpts);
true ->
ok
end,
init_cache(NewMod, Host, NewOpts).
%%%
%%% Uptime of ejabberd node
%%%
-spec process_local_iq(iq()) -> iq().
process_local_iq(#iq{type = set, lang = Lang} = IQ) ->
Txt = <<"Value 'set' of 'type' attribute is not allowed">>,
xmpp:make_error(IQ, xmpp:err_not_allowed(Txt, Lang));
process_local_iq(#iq{type = get} = IQ) ->
xmpp:make_iq_result(IQ, #last{seconds = get_node_uptime()}).
-spec get_node_uptime() -> non_neg_integer().
%% @doc Get the uptime of the ejabberd node, expressed in seconds.
%% When ejabberd is starting, ejabberd_config:start/0 stores the datetime.
get_node_uptime() ->
case ejabberd_config:get_option(node_start) of
undefined ->
trunc(element(1, erlang:statistics(wall_clock)) / 1000);
Now ->
p1_time_compat:system_time(seconds) - Now
end.
%%%
%%% Serve queries about user last online
%%%
-spec process_sm_iq(iq()) -> iq().
process_sm_iq(#iq{type = set, lang = Lang} = IQ) ->
Txt = <<"Value 'set' of 'type' attribute is not allowed">>,
xmpp:make_error(IQ, xmpp:err_not_allowed(Txt, Lang));
process_sm_iq(#iq{from = From, to = To, lang = Lang} = IQ) ->
User = To#jid.luser,
Server = To#jid.lserver,
{Subscription, _Ask, _Groups} =
ejabberd_hooks:run_fold(roster_get_jid_info, Server,
{none, none, []}, [User, Server, From]),
if (Subscription == both) or (Subscription == from) or
(From#jid.luser == To#jid.luser) and
(From#jid.lserver == To#jid.lserver) ->
Pres = xmpp:set_from_to(#presence{}, To, From),
case ejabberd_hooks:run_fold(privacy_check_packet,
Server, allow,
[To, Pres, out]) of
allow -> get_last_iq(IQ, User, Server);
deny -> xmpp:make_error(IQ, xmpp:err_forbidden())
end;
true ->
Txt = <<"Not subscribed">>,
xmpp:make_error(IQ, xmpp:err_subscription_required(Txt, Lang))
end.
privacy_check_packet(allow, C2SState,
#iq{from = From, to = To, type = T} = IQ, in)
when T == get; T == set ->
case xmpp:has_subtag(IQ, #last{}) of
true ->
#jid{luser = LUser, lserver = LServer} = To,
{Sub, _} = ejabberd_hooks:run_fold(
roster_get_jid_info, LServer,
{none, []}, [LUser, LServer, From]),
if Sub == from; Sub == both ->
Pres = #presence{from = To, to = From},
case ejabberd_hooks:run_fold(
privacy_check_packet, allow,
[C2SState, Pres, out]) of
allow ->
allow;
deny ->
{stop, deny}
end;
true ->
{stop, deny}
end;
false ->
allow
end;
privacy_check_packet(Acc, _, _, _) ->
Acc.
-spec get_last(binary(), binary()) -> {ok, non_neg_integer(), binary()} |
not_found | {error, any()}.
get_last(LUser, LServer) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
Res = case use_cache(Mod, LServer) of
true ->
ets_cache:lookup(
?LAST_CACHE, {LUser, LServer},
fun() -> Mod:get_last(LUser, LServer) end);
false ->
Mod:get_last(LUser, LServer)
end,
case Res of
{ok, {TimeStamp, Status}} -> {ok, TimeStamp, Status};
error -> not_found;
Err -> Err
end.
-spec get_last_iq(iq(), binary(), binary()) -> iq().
get_last_iq(#iq{lang = Lang} = IQ, LUser, LServer) ->
case ejabberd_sm:get_user_resources(LUser, LServer) of
[] ->
case get_last(LUser, LServer) of
{error, _Reason} ->
Txt = <<"Database failure">>,
xmpp:make_error(IQ, xmpp:err_internal_server_error(Txt, Lang));
not_found ->
Txt = <<"No info about last activity found">>,
xmpp:make_error(IQ, xmpp:err_service_unavailable(Txt, Lang));
{ok, TimeStamp, Status} ->
TimeStamp2 = p1_time_compat:system_time(seconds),
Sec = TimeStamp2 - TimeStamp,
xmpp:make_iq_result(IQ, #last{seconds = Sec, status = Status})
end;
_ ->
xmpp:make_iq_result(IQ, #last{seconds = 0})
end.
-spec register_user(binary(), binary()) -> any().
register_user(User, Server) ->
on_presence_update(
User,
Server,
<<"RegisterResource">>,
<<"Registered but didn't login">>).
-spec on_presence_update(binary(), binary(), binary(), binary()) -> any().
on_presence_update(User, Server, _Resource, Status) ->
TimeStamp = p1_time_compat:system_time(seconds),
store_last_info(User, Server, TimeStamp, Status).
-spec store_last_info(binary(), binary(), non_neg_integer(), binary()) -> any().
store_last_info(User, Server, TimeStamp, Status) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
Mod = gen_mod:db_mod(LServer, ?MODULE),
case use_cache(Mod, LServer) of
true ->
ets_cache:update(
?LAST_CACHE, {LUser, LServer}, {ok, {TimeStamp, Status}},
fun() ->
Mod:store_last_info(LUser, LServer, TimeStamp, Status)
end, cache_nodes(Mod, LServer));
false ->
Mod:store_last_info(LUser, LServer, TimeStamp, Status)
end.
-spec get_last_info(binary(), binary()) -> {ok, non_neg_integer(), binary()} |
not_found.
get_last_info(LUser, LServer) ->
case get_last(LUser, LServer) of
{error, _Reason} -> not_found;
Res -> Res
end.
-spec remove_user(binary(), binary()) -> any().
remove_user(User, Server) ->
LUser = jid:nodeprep(User),
LServer = jid:nameprep(Server),
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:remove_user(LUser, LServer),
ets_cache:delete(?LAST_CACHE, {LUser, LServer}, cache_nodes(Mod, LServer)).
-spec init_cache(module(), binary(), gen_mod:opts()) -> ok.
init_cache(Mod, Host, Opts) ->
case use_cache(Mod, Host) of
true ->
CacheOpts = cache_opts(Opts),
ets_cache:new(?LAST_CACHE, CacheOpts);
false ->
ets_cache:delete(?LAST_CACHE)
end.
-spec cache_opts(gen_mod:opts()) -> [proplists:property()].
cache_opts(Opts) ->
MaxSize = gen_mod:get_opt(cache_size, Opts),
CacheMissed = gen_mod:get_opt(cache_missed, Opts),
LifeTime = case gen_mod:get_opt(cache_life_time, Opts) of
infinity -> infinity;
I -> timer:seconds(I)
end,
[{max_size, MaxSize}, {cache_missed, CacheMissed}, {life_time, LifeTime}].
-spec use_cache(module(), binary()) -> boolean().
use_cache(Mod, Host) ->
case erlang:function_exported(Mod, use_cache, 1) of
true -> Mod:use_cache(Host);
false -> gen_mod:get_module_opt(Host, ?MODULE, use_cache)
end.
-spec cache_nodes(module(), binary()) -> [node()].
cache_nodes(Mod, Host) ->
case erlang:function_exported(Mod, cache_nodes, 1) of
true -> Mod:cache_nodes(Host);
false -> ejabberd_cluster:get_nodes()
end.
import_info() ->
[{<<"last">>, 3}].
import_start(LServer, DBType) ->
Mod = gen_mod:db_mod(DBType, ?MODULE),
Mod:init(LServer, []).
import(LServer, {sql, _}, DBType, <<"last">>, [LUser, TimeStamp, State]) ->
TS = case TimeStamp of
<<"">> -> 0;
_ -> binary_to_integer(TimeStamp)
end,
LA = #last_activity{us = {LUser, LServer},
timestamp = TS,
status = State},
Mod = gen_mod:db_mod(DBType, ?MODULE),
Mod:import(LServer, LA).
export(LServer) ->
Mod = gen_mod:db_mod(LServer, ?MODULE),
Mod:export(LServer).
depends(_Host, _Opts) ->
[].
mod_opt_type(db_type) -> fun(T) -> ejabberd_config:v_db(?MODULE, T) end;
mod_opt_type(O) when O == cache_life_time; O == cache_size ->
fun (I) when is_integer(I), I > 0 -> I;
(infinity) -> infinity
end;
mod_opt_type(O) when O == use_cache; O == cache_missed ->
fun (B) when is_boolean(B) -> B end.
mod_options(Host) ->
[{db_type, ejabberd_config:default_db(Host, ?MODULE)},
{use_cache, ejabberd_config:use_cache(Host)},
{cache_size, ejabberd_config:cache_size(Host)},
{cache_missed, ejabberd_config:cache_missed(Host)},
{cache_life_time, ejabberd_config:cache_life_time(Host)}].