321 lines
7.4 KiB
Erlang
321 lines
7.4 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : mod_offline.erl
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%%% Author : Alexey Shchepin <alexey@sevcom.net>
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%%% Purpose :
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%%% Created : 5 Jan 2003 by Alexey Shchepin <alexey@sevcom.net>
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%%% Id : $Id$
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%%%----------------------------------------------------------------------
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-module(mod_offline).
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-author('alexey@sevcom.net').
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-behaviour(gen_mod).
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-export([start/1,
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init/0,
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stop/0,
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store_packet/3,
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resend_offline_messages/1,
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pop_offline_messages/2,
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remove_expired_messages/0,
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remove_old_messages/1,
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remove_user/1]).
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-include("ejabberd.hrl").
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-include("jlib.hrl").
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-record(offline_msg, {user, timestamp, expire, from, to, packet}).
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-define(PROCNAME, ejabberd_offline).
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-define(OFFLINE_TABLE_LOCK_THRESHOLD, 1000).
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start(_) ->
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mnesia:create_table(offline_msg,
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[{disc_only_copies, [node()]},
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{type, bag},
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{attributes, record_info(fields, offline_msg)}]),
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update_table(),
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ejabberd_hooks:add(offline_message_hook,
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?MODULE, store_packet, 50),
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ejabberd_hooks:add(offline_subscription_hook,
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?MODULE, store_packet, 50),
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ejabberd_hooks:add(resend_offline_messages_hook,
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?MODULE, pop_offline_messages, 50),
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register(?PROCNAME, spawn(?MODULE, init, [])).
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init() ->
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loop().
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loop() ->
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receive
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#offline_msg{} = Msg ->
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Msgs = receive_all([Msg]),
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Len = length(Msgs),
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F = fun() ->
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if
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Len >= ?OFFLINE_TABLE_LOCK_THRESHOLD ->
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mnesia:write_lock_table(offline_msg);
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true ->
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ok
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end,
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lists:foreach(fun(M) ->
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mnesia:write(M)
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end, Msgs)
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end,
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mnesia:transaction(F),
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loop();
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_ ->
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loop()
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end.
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receive_all(Msgs) ->
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receive
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#offline_msg{} = Msg ->
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receive_all([Msg | Msgs])
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after 0 ->
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Msgs
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end.
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stop() ->
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ejabberd_hooks:delete(offline_message_hook,
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?MODULE, store_packet, 50),
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ejabberd_hooks:delete(offline_subscription_hook,
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?MODULE, store_packet, 50),
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ejabberd_hooks:delete(resend_offline_messages_hook,
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?MODULE, pop_offline_messages, 50),
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exit(whereis(?PROCNAME), stop),
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ok.
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store_packet(From, To, Packet) ->
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Type = xml:get_tag_attr_s("type", Packet),
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if
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(Type /= "error") and (Type /= "groupchat") ->
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case check_event(From, To, Packet) of
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true ->
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#jid{luser = LUser} = To,
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TimeStamp = now(),
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{xmlelement, _Name, _Attrs, Els} = Packet,
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Expire = find_x_expire(TimeStamp, Els),
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?PROCNAME ! #offline_msg{user = LUser,
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timestamp = TimeStamp,
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expire = Expire,
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from = From,
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to = To,
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packet = Packet},
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stop;
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_ ->
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ok
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end;
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true ->
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ok
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end.
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check_event(From, To, Packet) ->
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{xmlelement, Name, Attrs, Els} = Packet,
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case find_x_event(Els) of
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false ->
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true;
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El ->
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case xml:get_subtag(El, "id") of
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false ->
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case xml:get_subtag(El, "offline") of
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false ->
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true;
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_ ->
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ID = case xml:get_tag_attr_s("id", Packet) of
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"" ->
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{xmlelement, "id", [], []};
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S ->
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{xmlelement, "id", [],
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[{xmlcdata, S}]}
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end,
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ejabberd_router:route(
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To, From, {xmlelement, Name, Attrs,
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[{xmlelement, "x",
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[{"xmlns", ?NS_EVENT}],
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[ID,
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{xmlelement, "offline", [], []}]}]
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}),
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true
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end;
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_ ->
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false
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end
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end.
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find_x_event([]) ->
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false;
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find_x_event([{xmlcdata, _} | Els]) ->
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find_x_event(Els);
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find_x_event([El | Els]) ->
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case xml:get_tag_attr_s("xmlns", El) of
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?NS_EVENT ->
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El;
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_ ->
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find_x_event(Els)
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end.
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find_x_expire(_, []) ->
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never;
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find_x_expire(TimeStamp, [{xmlcdata, _} | Els]) ->
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find_x_expire(TimeStamp, Els);
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find_x_expire(TimeStamp, [El | Els]) ->
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case xml:get_tag_attr_s("xmlns", El) of
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?NS_EXPIRE ->
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case xml:get_tag_attr_s("seconds", El) of
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Val ->
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case catch list_to_integer(Val) of
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{'EXIT', _} ->
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never;
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Int when Int > 0 ->
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{MegaSecs, Secs, MicroSecs} = TimeStamp,
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S = MegaSecs * 1000000 + Secs + Int,
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MegaSecs1 = S div 1000000,
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Secs1 = S rem 1000000,
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{MegaSecs1, Secs1, MicroSecs};
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_ ->
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never
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end;
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_ ->
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never
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end;
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_ ->
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find_x_expire(TimeStamp, Els)
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end.
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resend_offline_messages(User) ->
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LUser = jlib:nodeprep(User),
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F = fun() ->
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Rs = mnesia:wread({offline_msg, LUser}),
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mnesia:delete({offline_msg, LUser}),
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Rs
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end,
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case mnesia:transaction(F) of
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{atomic, Rs} ->
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lists:foreach(
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fun(R) ->
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{xmlelement, Name, Attrs, Els} = R#offline_msg.packet,
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ejabberd_sm !
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{route,
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R#offline_msg.from,
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R#offline_msg.to,
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{xmlelement, Name, Attrs,
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Els ++
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[jlib:timestamp_to_xml(
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calendar:now_to_universal_time(
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R#offline_msg.timestamp))]}}
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end,
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lists:keysort(#offline_msg.timestamp, Rs));
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_ ->
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ok
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end.
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pop_offline_messages(Ls, User) ->
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LUser = jlib:nodeprep(User),
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F = fun() ->
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Rs = mnesia:wread({offline_msg, LUser}),
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mnesia:delete({offline_msg, LUser}),
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Rs
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end,
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case mnesia:transaction(F) of
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{atomic, Rs} ->
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TS = now(),
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Ls ++ lists:map(
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fun(R) ->
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{xmlelement, Name, Attrs, Els} = R#offline_msg.packet,
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{route,
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R#offline_msg.from,
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R#offline_msg.to,
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{xmlelement, Name, Attrs,
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Els ++
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[jlib:timestamp_to_xml(
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calendar:now_to_universal_time(
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R#offline_msg.timestamp))]}}
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end,
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lists:filter(
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fun(R) ->
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case R#offline_msg.expire of
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never ->
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true;
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TimeStamp ->
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TS < TimeStamp
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end
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end,
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lists:keysort(#offline_msg.timestamp, Rs)));
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_ ->
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Ls
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end.
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remove_expired_messages() ->
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TimeStamp = now(),
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F = fun() ->
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mnesia:write_lock_table(offline_msg),
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mnesia:foldl(
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fun(Rec, _Acc) ->
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case Rec#offline_msg.expire of
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never ->
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ok;
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TS ->
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if
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TS < TimeStamp ->
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mnesia:delete_object(Rec);
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true ->
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ok
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end
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end
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end, ok, offline_msg)
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end,
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mnesia:transaction(F).
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remove_old_messages(Days) ->
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{MegaSecs, Secs, _MicroSecs} = now(),
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S = MegaSecs * 1000000 + Secs - 60 * 60 * 24 * Days,
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MegaSecs1 = S div 1000000,
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Secs1 = S rem 1000000,
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TimeStamp = {MegaSecs1, Secs1, 0},
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F = fun() ->
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mnesia:write_lock_table(offline_msg),
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mnesia:foldl(
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fun(#offline_msg{timestamp = TS} = Rec, _Acc)
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when TS < TimeStamp ->
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mnesia:delete_object(Rec);
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(_Rec, _Acc) -> ok
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end, ok, offline_msg)
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end,
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mnesia:transaction(F).
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remove_user(User) ->
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LUser = jlib:nodeprep(User),
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F = fun() ->
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mnesia:delete({offline_msg, LUser})
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end,
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mnesia:transaction(F).
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update_table() ->
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Fields = record_info(fields, offline_msg),
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case mnesia:table_info(offline_msg, attributes) of
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Fields ->
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ok;
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[user, timestamp, from, to, packet] ->
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?INFO_MSG("Converting offline_msg table from "
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"{user, timestamp, from, to, packet} format", []),
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mnesia:transform_table(
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offline_msg,
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fun({_, U, TS, F, T, P}) ->
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{xmlelement, _Name, _Attrs, Els} = P,
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Expire = find_x_expire(TS, Els),
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#offline_msg{user = U,
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timestamp = TS,
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expire = Expire,
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from = F,
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to = T,
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packet = P}
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end, Fields);
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_ ->
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?INFO_MSG("Recreating offline_msg table", []),
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mnesia:transform_table(last_activity, ignore, Fields)
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end.
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