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|
%%%----------------------------------------------------------------------
%%% File : mod_offline.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose :
%%% Created : 5 Jan 2003 by Alexey Shchepin <alexey@sevcom.net>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(mod_offline).
-author('alexey@sevcom.net').
-behaviour(gen_mod).
-export([start/1,
init/0,
stop/0,
store_packet/3,
resend_offline_messages/1,
remove_user/1]).
-include("jlib.hrl").
-record(offline_msg, {user, timestamp, from, to, packet}).
-define(PROCNAME, ejabberd_offline).
start(_) ->
mnesia:create_table(offline_msg,
[{disc_only_copies, [node()]},
{type, bag},
{attributes, record_info(fields, offline_msg)}]),
register(?PROCNAME, spawn(?MODULE, init, [])).
init() ->
loop().
loop() ->
receive
#offline_msg{} = Msg ->
Msgs = receive_all([Msg]),
F = fun() ->
lists:foreach(fun(M) ->
mnesia:write(M)
end, Msgs)
end,
mnesia:transaction(F),
loop();
_ ->
loop()
end.
receive_all(Msgs) ->
receive
#offline_msg{} = Msg ->
receive_all([Msg | Msgs])
after 0 ->
Msgs
end.
stop() ->
exit(whereis(?PROCNAME), stop),
ok.
store_packet(From, To, Packet) ->
true = is_process_alive(whereis(?PROCNAME)),
case check_event(From, To, Packet) of
true ->
{User, Server, Resource} = To,
LUser = jlib:tolower(User),
TimeStamp = now(),
?PROCNAME ! #offline_msg{user = LUser,
timestamp = TimeStamp,
from = From,
to = To,
packet = Packet};
_ ->
ok
end.
check_event(From, To, Packet) ->
{xmlelement, Name, Attrs, Els} = Packet,
case find_x_event(Els) of
false ->
true;
El ->
case xml:get_subtag(El, "id") of
false ->
case xml:get_subtag(El, "offline") of
false ->
true;
_ ->
ID = case xml:get_tag_attr_s("id", Packet) of
"" ->
{xmlelement, "id", [], []};
S ->
{xmlelement, "id", [],
[{xmlcdata, S}]}
end,
ejabberd_router:route(
To, From, {xmlelement, Name, Attrs,
[{xmlelement, "x",
[{"xmlns", ?NS_EVENT}],
[ID,
{xmlelement, "offline", [], []}]}]
}),
true
end;
_ ->
false
end
end.
find_x_event([]) ->
false;
find_x_event([{xmlcdata, _} | Els]) ->
find_x_event(Els);
find_x_event([El | Els]) ->
case xml:get_tag_attr_s("xmlns", El) of
?NS_EVENT ->
El;
_ ->
find_x_event(Els)
end.
resend_offline_messages(User) ->
LUser = jlib:tolower(User),
F = fun() ->
Rs = mnesia:read({offline_msg, LUser}),
mnesia:delete({offline_msg, LUser}),
Rs
end,
case mnesia:transaction(F) of
{atomic, Rs} ->
lists:foreach(
fun(R) ->
{xmlelement, Name, Attrs, Els} = R#offline_msg.packet,
ejabberd_sm !
{route,
R#offline_msg.from,
R#offline_msg.to,
{xmlelement, Name, Attrs,
Els ++
[jlib:timestamp_to_xml(
calendar:now_to_universal_time(
R#offline_msg.timestamp))]}}
end,
lists:keysort(#offline_msg.timestamp, Rs));
_ ->
ok
end.
remove_user(User) ->
LUser = jlib:tolower(User),
F = fun() ->
mnesia:delete({offline_msg, LUser})
end,
mnesia:transaction(F).
|
