%%%----------------------------------------------------------------------
%%% File : ejabberd_sm.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose :
%%% Created : 24 Nov 2002 by Alexey Shchepin <alexey@sevcom.net>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(ejabberd_sm).
-author('alexey@sevcom.net').
-vsn('$Revision$ ').
-export([start_link/0, init/0, open_session/2, close_session/2,
get_user_resources/1,
set_presence/3,
unset_presence/2,
dirty_get_sessions_list/0,
dirty_get_my_sessions_list/0,
register_iq_handler/3,
register_iq_handler/4,
unregister_iq_handler/1
]).
-include_lib("mnemosyne/include/mnemosyne.hrl").
-include("ejabberd.hrl").
-record(session, {ur, user, node}).
-record(local_session, {ur, pid}).
-record(presence, {ur, user, priority}).
start_link() ->
{ok, proc_lib:spawn_link(ejabberd_sm, init, [])}.
init() ->
register(ejabberd_sm, self()),
mnesia:create_table(session, [{ram_copies, [node()]},
{attributes, record_info(fields, session)}]),
mnesia:add_table_index(session, user),
mnesia:add_table_index(session, node),
mnesia:create_table(local_session,
[{ram_copies, [node()]},
{local_content, true},
{attributes, record_info(fields, local_session)}]),
mnesia:add_table_copy(local_session, node(), ram_copies),
mnesia:create_table(presence,
[{ram_copies, [node()]},
{attributes, record_info(fields, presence)}]),
mnesia:add_table_index(presence, user),
mnesia:subscribe(system),
ets:new(sm_iqtable, [named_table]),
loop().
loop() ->
receive
{route, From, To, Packet} ->
case catch do_route(From, To, Packet) of
{'EXIT', Reason} ->
?ERROR_MSG("~p", [Reason]);
_ ->
ok
end,
loop();
{open_session, User, Resource, From} ->
replace_and_register_my_connection(User, Resource, From),
replace_alien_connection(User, Resource),
loop();
{close_session, User, Resource} ->
remove_connection(User, Resource),
loop();
{replace, User, Resource} ->
replace_my_connection(User, Resource),
loop();
{mnesia_system_event, {mnesia_down, Node}} ->
clean_table_from_bad_node(Node),
loop();
{register_iq_handler, XMLNS, Module, Function} ->
ets:insert(sm_iqtable, {XMLNS, Module, Function}),
loop();
{register_iq_handler, XMLNS, Module, Function, Opts} ->
ets:insert(sm_iqtable, {XMLNS, Module, Function, Opts}),
loop();
{unregister_iq_handler, XMLNS} ->
case ets:lookup(sm_iqtable, XMLNS) of
[{_, Module, Function, Opts}] ->
gen_iq_handler:stop_iq_handler(Module, Function, Opts);
_ ->
ok
end,
ets:delete(sm_iqtable, XMLNS),
mod_disco:unregister_feature(XMLNS),
loop();
_ ->
loop()
end.
open_session(User, Resource) ->
ejabberd_sm ! {open_session, User, Resource, self()}.
close_session(User, Resource) ->
ejabberd_sm ! {close_session, User, Resource}.
replace_alien_connection(User, Resource) ->
LUser = jlib:tolower(User),
F = fun() ->
UR = {LUser, Resource},
Es = mnesia:read({session, UR}),
mnesia:write(#session{ur = UR, user = LUser, node = node()}),
Es
end,
case mnesia:transaction(F) of
{atomic, Rs} ->
lists:foreach(
fun(R) ->
if R#session.node /= node() ->
{ejabberd_sm, R#session.node} !
{replace, User, Resource};
true ->
ok
end
end, Rs);
_ ->
false
end.
replace_my_connection(User, Resource) ->
LUser = jlib:tolower(User),
F = fun() ->
UR = {LUser, Resource},
Es = mnesia:read({local_session, UR}),
mnesia:delete({local_session, UR}),
Es
end,
case mnesia:transaction(F) of
{atomic, Rs} ->
lists:foreach(
fun(R) ->
R#local_session.pid ! replaced
end, Rs);
_ ->
false
end.
remove_connection(User, Resource) ->
LUser = jlib:tolower(User),
F = fun() ->
UR = {LUser, Resource},
mnesia:delete({local_session, UR}),
mnesia:delete({session, UR})
end,
mnesia:transaction(F).
replace_and_register_my_connection(User, Resource, Pid) ->
LUser = jlib:tolower(User),
F = fun() ->
UR = {LUser, Resource},
Es = mnesia:read({local_session, UR}),
mnesia:write(#local_session{ur = UR, pid = Pid}),
Es
end,
case mnesia:transaction(F) of
{atomic, Rs} ->
lists:foreach(
fun(R) ->
R#local_session.pid ! replaced
end, Rs);
_ ->
false
end.
clean_table_from_bad_node(Node) ->
F = fun() ->
Es = mnesia:index_read(session, Node, #session.node),
lists:foreach(fun(E) ->
mnesia:delete_object(session, E, write),
mnesia:delete(
{user_resource, E#session.ur})
end, Es)
end,
mnesia:transaction(F).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
do_route(From, To, Packet) ->
?DEBUG("session manager~n\tfrom ~p~n\tto ~p~n\tpacket ~P~n",
[From, To, Packet, 8]),
{User, Server, Resource} = To,
{xmlelement, Name, Attrs, Els} = Packet,
case Resource of
"" ->
% TODO
case Name of
"presence" ->
{FU, FS, FR} = From,
{Pass, Subsc} =
case xml:get_attr_s("type", Attrs) of
"subscribe" ->
{mod_roster:in_subscription(User,
{FU, FS, ""},
subscribe),
true};
"subscribed" ->
{mod_roster:in_subscription(User,
{FU, FS, ""},
subscribed),
true};
"unsubscribe" ->
{mod_roster:in_subscription(User,
{FU, FS, ""},
unsubscribe),
true};
"unsubscribed" ->
{mod_roster:in_subscription(User,
{FU, FS, ""},
unsubscribed),
true};
_ ->
{true, false}
end,
if Pass ->
LFrom = jlib:jid_tolower(From),
LUser = jlib:tolower(User),
LServer = jlib:tolower(Server),
Resources = get_user_resources(User),
if
Resources /= [] ->
lists:foreach(
fun(R) ->
if LFrom /=
{LUser, LServer, R} ->
ejabberd_sm !
{route,
From,
{User, Server, R},
Packet};
true ->
ok
end
end, Resources);
true ->
if
Subsc ->
mod_offline:store_packet(
From, To, Packet);
true ->
ok
end
end;
true ->
ok
end;
"message" ->
route_message(From, To, Packet);
"iq" ->
process_iq(From, To, Packet);
"broadcast" ->
lists:foreach(
fun(R) ->
ejabberd_sm ! {route,
From,
{User, Server, R},
Packet}
end, get_user_resources(User));
_ ->
ok
end;
_ ->
LUR = {jlib:tolower(User), Resource},
Sess = mnesia:dirty_read({session, LUR}),
case Sess of
[] ->
if
Name == "message" ->
route_message(From, To, Packet);
true ->
?DEBUG("packet droped~n", [])
end;
[Ses] ->
case mnesia:dirty_read({local_session, LUR}) of
[] ->
Node = Ses#session.node,
?DEBUG("sending to node ~p~n", [Node]),
{ejabberd_sm, Node} ! {route, From, To, Packet};
[El] ->
Pid = El#local_session.pid,
?DEBUG("sending to process ~p~n", [Pid]),
Pid ! {route, From, To, Packet}
end
end
end.
route_message(From, To, Packet) ->
{User, Server, Resource} = To,
case catch lists:max(get_user_present_resources(User)) of
{'EXIT', _} ->
case ejabberd_auth:is_user_exists(User) of
true ->
mod_offline:store_packet(From, To, Packet);
_ ->
?DEBUG("packet droped~n", [])
end;
{_, R} ->
ejabberd_sm ! {route,
From,
{User, Server, R},
Packet}
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
get_user_resources(User) ->
LUser = jlib:tolower(User),
case catch mnesia:dirty_index_read(session, LUser, #session.user) of
{'EXIT', Reason} ->
[];
Rs ->
lists:map(fun(R) ->
element(2, R#session.ur)
end, Rs)
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
set_presence(User, Resource, Priority) ->
LUser = jlib:tolower(User),
F = fun() ->
UR = {User, Resource},
mnesia:write(#presence{ur = UR, user = LUser,
priority = Priority})
end,
mnesia:transaction(F).
unset_presence(User, Resource) ->
LUser = jlib:tolower(User),
F = fun() ->
UR = {User, Resource},
mnesia:delete({presence, UR})
end,
mnesia:transaction(F).
get_user_present_resources(User) ->
LUser = jlib:tolower(User),
case catch mnesia:dirty_index_read(presence, LUser, #presence.user) of
{'EXIT', Reason} ->
[];
Rs ->
lists:map(fun(R) ->
{R#presence.priority, element(2, R#presence.ur)}
end, Rs)
end.
dirty_get_sessions_list() ->
mnesia:dirty_all_keys(session).
dirty_get_my_sessions_list() ->
mnesia:dirty_all_keys(local_session).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
process_iq(From, To, Packet) ->
IQ = jlib:iq_query_info(Packet),
case IQ of
{iq, ID, Type, XMLNS, SubEl} ->
case ets:lookup(sm_iqtable, XMLNS) of
[{_, Module, Function}] ->
ResIQ = apply(Module, Function, [From, To, IQ]),
if
ResIQ /= ignore ->
ejabberd_router ! {route,
To,
From,
jlib:iq_to_xml(ResIQ)};
true ->
ok
end;
[{_, Module, Function, Opts}] ->
gen_iq_handler:handle(Module, Function, Opts,
From, To, IQ);
[] ->
Err = jlib:make_error_reply(
Packet, "501", "Not Implemented"),
ejabberd_router ! {route, To, From, Err}
end;
reply ->
ok;
_ ->
Err = jlib:make_error_reply(Packet, "400", "Bad Request"),
ejabberd_router ! {route, To, From, Err},
ok
end.
register_iq_handler(XMLNS, Module, Fun) ->
ejabberd_sm ! {register_iq_handler, XMLNS, Module, Fun}.
register_iq_handler(XMLNS, Module, Fun, Opts) ->
ejabberd_sm ! {register_iq_handler, XMLNS, Module, Fun, Opts}.
unregister_iq_handler(XMLNS) ->
ejabberd_sm ! {unregister_iq_handler, XMLNS}.
