Chapril/xmpp.chapril.org-ejabberd
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xmpp.chapril.org-ejabberd/src/ejabberd_sm.erl
Jean-Sébastien Pédron 9f0d79da9a o Use the new functions from jlib. 
o  Remove the compatibility code. It's becoming confusing to handle every
case every where. Also, in JIDs (normal and short), the atom "undefined'
is expected, not the empty string anymore!

SVN Revision: 1546
2008-08-26 13:38:49 +00:00

722 lines
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%%%----------------------------------------------------------------------
%%% File : ejabberd_sm.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Session manager
%%% Created : 24 Nov 2002 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2008 Process-one
%%%
%%% 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., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%----------------------------------------------------------------------
-module(ejabberd_sm).
-author('alexey@process-one.net').
-behaviour(gen_server).
%% API
-export([start_link/0,
route/3,
open_session/5, close_session/4,
check_in_subscription/6,
bounce_offline_message/3,
disconnect_removed_user/2,
get_user_resources/2,
set_presence/7,
unset_presence/6,
close_session_unset_presence/5,
dirty_get_sessions_list/0,
dirty_get_my_sessions_list/0,
get_vh_session_list/1,
register_iq_handler/4,
register_iq_handler/5,
unregister_iq_handler/2,
ctl_process/2,
get_session_pid/3,
get_user_info/3,
get_user_ip/3
]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-include_lib("exmpp/include/exmpp.hrl").
-include("ejabberd.hrl").
-include("ejabberd_ctl.hrl").
-record(session, {sid, usr, us, priority, info}).
-record(state, {}).
%% default value for the maximum number of user connections
-define(MAX_USER_SESSIONS, infinity).
% These are the namespace already declared by the stream opening. This is
% used at serialization time.
-define(DEFAULT_NS, ?NS_JABBER_CLIENT).
-define(PREFIXED_NS, [
{?NS_XMPP, ?NS_XMPP_pfx}, {?NS_DIALBACK, ?NS_DIALBACK_pfx}
]).
%%====================================================================
%% API
%%====================================================================
%%--------------------------------------------------------------------
%% Function: start_link() -> {ok,Pid} | ignore | {error,Error}
%% Description: Starts the server
%%--------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
route(FromOld, ToOld, #xmlelement{} = PacketOld) ->
catch throw(for_stacktrace), % To have a stacktrace.
io:format("~nSM: old #xmlelement:~n~p~n~p~n~n",
[PacketOld, erlang:get_stacktrace()]),
% XXX OLD FORMAT: From, To, Packet.
From = jlib:from_old_jid(FromOld),
To = jlib:from_old_jid(ToOld),
Packet = exmpp_xml:xmlelement_to_xmlel(PacketOld, [?NS_JABBER_CLIENT],
[{?NS_XMPP, ?NS_XMPP_pfx}]),
route(From, To, Packet);
route(From, To, Packet) ->
case catch do_route(From, To, Packet) of
{'EXIT', Reason} ->
?ERROR_MSG("~p~nwhen processing: ~p",
[Reason, {From, To, Packet}]);
_ ->
ok
end.
open_session(SID, User, Server, Resource, Info) ->
set_session(SID, User, Server, Resource, undefined, Info),
check_for_sessions_to_replace(User, Server, Resource),
JID = exmpp_jid:make_jid(User, Server, Resource),
ejabberd_hooks:run(sm_register_connection_hook, JID#jid.ldomain,
[SID, JID, Info]).
close_session(SID, User, Server, Resource) ->
Info = case mnesia:dirty_read({session, SID}) of
[] -> [];
[#session{info=I}] -> I
end,
F = fun() ->
mnesia:delete({session, SID})
end,
mnesia:sync_dirty(F),
JID = exmpp_jid:make_jid(User, Server, Resource),
ejabberd_hooks:run(sm_remove_connection_hook, JID#jid.ldomain,
[SID, JID, Info]).
check_in_subscription(Acc, User, Server, _JID, _Type, _Reason) ->
case ejabberd_auth:is_user_exists(User, Server) of
true ->
Acc;
false ->
{stop, false}
end.
bounce_offline_message(From, To, Packet) ->
Err = exmpp_stanza:reply_with_error(Packet, 'service-unavailable'),
ejabberd_router:route(To, From, Err),
stop.
disconnect_removed_user(User, Server) ->
ejabberd_sm:route(#jid{},
exmpp_jid:make_bare_jid(User, Server),
#xmlel{name = 'broadcast',
children = [{exit, "User removed"}]}).
get_user_resources(User, Server) ->
LUser = exmpp_stringprep:nodeprep(User),
LServer = exmpp_stringprep:nameprep(Server),
US = {LUser, LServer},
case catch mnesia:dirty_index_read(session, US, #session.us) of
{'EXIT', _Reason} ->
[];
Ss ->
[element(3, S#session.usr) || S <- clean_session_list(Ss)]
end.
get_user_ip(User, Server, Resource) ->
LUser = exmpp_stringprep:nodeprep(User),
LServer = exmpp_stringprep:nameprep(Server),
LResource = exmpp_stringprep:resourceprep(Resource),
USR = {LUser, LServer, LResource},
case mnesia:dirty_index_read(session, USR, #session.usr) of
[] ->
undefined;
Ss ->
Session = lists:max(Ss),
proplists:get_value(ip, Session#session.info)
end.
get_user_info(User, Server, Resource) ->
LUser = exmpp_stringprep:nodeprep(User),
LServer = exmpp_stringprep:nameprep(Server),
LResource = exmpp_stringprep:resourceprep(Resource),
USR = {LUser, LServer, LResource},
case mnesia:dirty_index_read(session, USR, #session.usr) of
[] ->
offline;
Ss ->
Session = lists:max(Ss),
Node = node(element(2, Session#session.sid)),
Conn = proplists:get_value(conn, Session#session.info),
IP = proplists:get_value(ip, Session#session.info),
[{node, Node}, {conn, Conn}, {ip, IP}]
end.
set_presence(SID, User, Server, Resource, Priority, Presence, Info) ->
set_session(SID, User, Server, Resource, Priority, Info),
ejabberd_hooks:run(set_presence_hook, exmpp_stringprep:nameprep(Server),
[User, Server, Resource, Presence]).
unset_presence(SID, User, Server, Resource, Status, Info) ->
set_session(SID, User, Server, Resource, undefined, Info),
ejabberd_hooks:run(unset_presence_hook, exmpp_stringprep:nameprep(Server),
[User, Server, Resource, Status]).
close_session_unset_presence(SID, User, Server, Resource, Status) ->
close_session(SID, User, Server, Resource),
ejabberd_hooks:run(unset_presence_hook, exmpp_stringprep:nameprep(Server),
[User, Server, Resource, Status]).
get_session_pid(User, Server, Resource) ->
LUser = exmpp_stringprep:nodeprep(User),
LServer = exmpp_stringprep:nameprep(Server),
LResource = exmpp_stringprep:resourceprep(Resource),
USR = {LUser, LServer, LResource},
case catch mnesia:dirty_index_read(session, USR, #session.usr) of
[#session{sid = {_, Pid}}] -> Pid;
_ -> none
end.
dirty_get_sessions_list() ->
mnesia:dirty_select(
session,
[{#session{usr = '$1', _ = '_'},
[],
['$1']}]).
dirty_get_my_sessions_list() ->
mnesia:dirty_select(
session,
[{#session{sid = {'_', '$1'}, _ = '_'},
[{'==', {node, '$1'}, node()}],
['$_']}]).
get_vh_session_list(Server) ->
LServer = exmpp_stringprep:nameprep(Server),
mnesia:dirty_select(
session,
[{#session{usr = '$1', _ = '_'},
[{'==', {element, 2, '$1'}, LServer}],
['$1']}]).
register_iq_handler(Host, XMLNS, Module, Fun) ->
ejabberd_sm ! {register_iq_handler, Host, XMLNS, Module, Fun}.
register_iq_handler(Host, XMLNS, Module, Fun, Opts) ->
ejabberd_sm ! {register_iq_handler, Host, XMLNS, Module, Fun, Opts}.
unregister_iq_handler(Host, XMLNS) ->
ejabberd_sm ! {unregister_iq_handler, Host, XMLNS}.
%%====================================================================
%% gen_server callbacks
%%====================================================================
%%--------------------------------------------------------------------
%% Function: init(Args) -> {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%% Description: Initiates the server
%%--------------------------------------------------------------------
init([]) ->
update_tables(),
mnesia:create_table(session,
[{ram_copies, [node()]},
{attributes, record_info(fields, session)}]),
mnesia:add_table_index(session, usr),
mnesia:add_table_index(session, us),
mnesia:add_table_copy(session, node(), ram_copies),
mnesia:subscribe(system),
ets:new(sm_iqtable, [named_table]),
lists:foreach(
fun(Host) ->
ejabberd_hooks:add(roster_in_subscription, Host,
ejabberd_sm, check_in_subscription, 20),
ejabberd_hooks:add(offline_message_hook, Host,
ejabberd_sm, bounce_offline_message, 100),
ejabberd_hooks:add(remove_user, Host,
ejabberd_sm, disconnect_removed_user, 100)
end, ?MYHOSTS),
ejabberd_ctl:register_commands(
[{"connected-users", "list all established sessions"},
{"connected-users-number", "print a number of established sessions"},
{"user-resources user server", "print user's connected resources"}],
?MODULE, ctl_process),
{ok, #state{}}.
%%--------------------------------------------------------------------
%% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} |
%% {reply, Reply, State, Timeout} |
%% {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, Reply, State} |
%% {stop, Reason, State}
%% Description: Handling call messages
%%--------------------------------------------------------------------
handle_call(_Request, _From, State) ->
Reply = ok,
{reply, Reply, State}.
%%--------------------------------------------------------------------
%% Function: handle_cast(Msg, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling cast messages
%%--------------------------------------------------------------------
handle_cast(_Msg, State) ->
{noreply, State}.
%%--------------------------------------------------------------------
%% Function: handle_info(Info, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% Description: Handling all non call/cast messages
%%--------------------------------------------------------------------
handle_info({route, FromOld, ToOld, #xmlelement{} = PacketOld}, State) ->
catch throw(for_stacktrace), % To have a stacktrace.
io:format("~nSM: old #xmlelement:~n~p~n~p~n~n",
[PacketOld, erlang:get_stacktrace()]),
% XXX OLD FORMAT: From, To, Packet.
From = jlib:from_old_jid(FromOld),
To = jlib:from_old_jid(ToOld),
Packet = exmpp_xml:xmlelement_to_xmlel(PacketOld, [?NS_JABBER_CLIENT],
[{?NS_XMPP, ?NS_XMPP_pfx}]),
handle_info({route, From, To, Packet}, State);
handle_info({route, From, To, Packet}, State) ->
case catch do_route(From, To, Packet) of
{'EXIT', Reason} ->
?ERROR_MSG("~p~nwhen processing: ~p",
[Reason, {From, To, Packet}]);
_ ->
ok
end,
{noreply, State};
handle_info({mnesia_system_event, {mnesia_down, Node}}, State) ->
clean_table_from_bad_node(Node),
{noreply, State};
handle_info({register_iq_handler, Host, XMLNS, Module, Function}, State) ->
ets:insert(sm_iqtable, {{XMLNS, Host}, Module, Function}),
{noreply, State};
handle_info({register_iq_handler, Host, XMLNS, Module, Function, Opts}, State) ->
ets:insert(sm_iqtable, {{XMLNS, Host}, Module, Function, Opts}),
{noreply, State};
handle_info({unregister_iq_handler, Host, XMLNS}, State) ->
case ets:lookup(sm_iqtable, {XMLNS, Host}) of
[{_, Module, Function, Opts}] ->
gen_iq_handler:stop_iq_handler(Module, Function, Opts);
_ ->
ok
end,
ets:delete(sm_iqtable, {XMLNS, Host}),
{noreply, State};
handle_info(_Info, State) ->
{noreply, State}.
%%--------------------------------------------------------------------
%% Function: terminate(Reason, State) -> void()
%% Description: This function is called by a gen_server when it is about to
%% terminate. It should be the opposite of Module:init/1 and do any necessary
%% cleaning up. When it returns, the gen_server terminates with Reason.
%% The return value is ignored.
%%--------------------------------------------------------------------
terminate(_Reason, _State) ->
ok.
%%--------------------------------------------------------------------
%% Func: code_change(OldVsn, State, Extra) -> {ok, NewState}
%% Description: Convert process state when code is changed
%%--------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
set_session(SID, User, Server, Resource, Priority, Info) ->
LUser = exmpp_stringprep:nodeprep(User),
LServer = exmpp_stringprep:nameprep(Server),
LResource = exmpp_stringprep:resourceprep(Resource),
US = {LUser, LServer},
USR = {LUser, LServer, LResource},
F = fun() ->
mnesia:write(#session{sid = SID,
usr = USR,
us = US,
priority = Priority,
info = Info})
end,
mnesia:sync_dirty(F).
clean_table_from_bad_node(Node) ->
F = fun() ->
Es = mnesia:select(
session,
[{#session{sid = {'_', '$1'}, _ = '_'},
[{'==', {node, '$1'}, Node}],
['$_']}]),
lists:foreach(fun(E) ->
mnesia:delete({session, E#session.sid})
end, Es)
end,
mnesia:sync_dirty(F).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
do_route(From, To, Packet) ->
?DEBUG("session manager~n\tfrom ~p~n\tto ~p~n\tpacket ~P~n",
[From, To, Packet, 8]),
#jid{node = User, domain = Server,
lnode = LUser, ldomain = LServer, lresource = LResource} = To,
case LResource of
undefined ->
case Packet of
_ when ?IS_PRESENCE(Packet) ->
{Pass, _Subsc} =
case exmpp_presence:get_type(Packet) of
'subscribe' ->
Reason = exmpp_presence:get_status(Packet),
{ejabberd_hooks:run_fold(
roster_in_subscription,
LServer,
false,
[User, Server, From, subscribe, Reason]),
true};
'subscribed' ->
{ejabberd_hooks:run_fold(
roster_in_subscription,
LServer,
false,
[User, Server, From, subscribed, ""]),
true};
'unsubscribe' ->
{ejabberd_hooks:run_fold(
roster_in_subscription,
LServer,
false,
[User, Server, From, unsubscribe, ""]),
true};
'unsubscribed' ->
{ejabberd_hooks:run_fold(
roster_in_subscription,
LServer,
false,
[User, Server, From, unsubscribed, ""]),
true};
_ ->
{true, false}
end,
if Pass ->
PResources = get_user_present_resources(
LUser, LServer),
lists:foreach(
fun({_, R}) ->
do_route(
From,
exmpp_jid:bare_jid_to_jid(To, R),
Packet)
end, PResources);
true ->
ok
end;
_ when ?IS_MESSAGE(Packet) ->
route_message(From, To, Packet);
_ when ?IS_IQ(Packet) ->
process_iq(From, To, Packet);
#xmlel{name = 'broadcast'} ->
lists:foreach(
fun(R) ->
do_route(From,
exmpp_jid:bare_jid_to_jid(To, R),
Packet)
end, get_user_resources(User, Server));
_ ->
ok
end;
_ ->
USR = {LUser, LServer, LResource},
case mnesia:dirty_index_read(session, USR, #session.usr) of
[] ->
case Packet of
_ when ?IS_MESSAGE(Packet) ->
route_message(From, To, Packet);
_ when ?IS_IQ(Packet) ->
case exmpp_iq:get_type(Packet) of
'error' -> ok;
'result' -> ok;
_ ->
Err =
exmpp_iq:error(Packet,
'service-unavailable'),
ejabberd_router:route(To, From, Err)
end;
_ ->
?DEBUG("packet droped~n", [])
end;
Ss ->
Session = lists:max(Ss),
Pid = element(2, Session#session.sid),
?DEBUG("sending to process ~p~n", [Pid]),
Pid ! {route, From, To, Packet}
end
end.
route_message(From, To, Packet) ->
LUser = To#jid.lnode,
LServer = To#jid.ldomain,
PrioRes = get_user_present_resources(LUser, LServer),
case catch lists:max(PrioRes) of
{Priority, _R} when is_integer(Priority), Priority >= 0 ->
lists:foreach(
%% Route messages to all priority that equals the max, if
%% positive
fun({P, R}) when P == Priority ->
LResource = exmpp_stringprep:resourceprep(R),
USR = {LUser, LServer, LResource},
case mnesia:dirty_index_read(session, USR, #session.usr) of
[] ->
ok; % Race condition
Ss ->
Session = lists:max(Ss),
Pid = element(2, Session#session.sid),
?DEBUG("sending to process ~p~n", [Pid]),
Pid ! {route, From, To, Packet}
end;
%% Ignore other priority:
({_Prio, _Res}) ->
ok
end,
PrioRes);
_ ->
case exmpp_message:get_type(Packet) of
'error' ->
ok;
'groupchat' ->
bounce_offline_message(From, To, Packet);
'headline' ->
bounce_offline_message(From, To, Packet);
_ ->
case ejabberd_auth:is_user_exists(LUser, LServer) of
true ->
ejabberd_hooks:run(offline_message_hook,
LServer,
[From, To, Packet]);
_ ->
Err = exmpp_stanza:reply_with_error(
Packet, 'service-unaivailable'),
ejabberd_router:route(To, From, Err)
end
end
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
clean_session_list(Ss) ->
clean_session_list(lists:keysort(#session.usr, Ss), []).
clean_session_list([], Res) ->
Res;
clean_session_list([S], Res) ->
[S | Res];
clean_session_list([S1, S2 | Rest], Res) ->
if
S1#session.usr == S2#session.usr ->
if
S1#session.sid > S2#session.sid ->
clean_session_list([S1 | Rest], Res);
true ->
clean_session_list([S2 | Rest], Res)
end;
true ->
clean_session_list([S2 | Rest], [S1 | Res])
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
get_user_present_resources(LUser, LServer) ->
US = {LUser, LServer},
case catch mnesia:dirty_index_read(session, US, #session.us) of
{'EXIT', _Reason} ->
[];
Ss ->
[{S#session.priority, element(3, S#session.usr)} ||
S <- clean_session_list(Ss), is_integer(S#session.priority)]
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% On new session, check if some existing connections need to be replace
check_for_sessions_to_replace(User, Server, Resource) ->
LUser = exmpp_stringprep:nodeprep(User),
LServer = exmpp_stringprep:nameprep(Server),
LResource = exmpp_stringprep:resourceprep(Resource),
%% TODO: Depending on how this is executed, there could be an unneeded
%% replacement for max_sessions. We need to check this at some point.
check_existing_resources(LUser, LServer, LResource),
check_max_sessions(LUser, LServer).
check_existing_resources(LUser, LServer, LResource) ->
USR = {LUser, LServer, LResource},
%% A connection exist with the same resource. We replace it:
SIDs = mnesia:dirty_select(
session,
[{#session{sid = '$1', usr = USR, _ = '_'}, [], ['$1']}]),
if
SIDs == [] -> ok;
true ->
MaxSID = lists:max(SIDs),
lists:foreach(
fun({_, Pid} = S) when S /= MaxSID ->
Pid ! replaced;
(_) -> ok
end, SIDs)
end.
check_max_sessions(LUser, LServer) ->
%% If the max number of sessions for a given is reached, we replace the
%% first one
SIDs = mnesia:dirty_select(
session,
[{#session{sid = '$1', us = {LUser, LServer}, _ = '_'}, [],
['$1']}]),
MaxSessions = get_max_user_sessions(LUser, LServer),
if
length(SIDs) =< MaxSessions ->
ok;
true ->
{_, Pid} = lists:min(SIDs),
Pid ! replaced
end.
%% Get the user_max_session setting
%% This option defines the max number of time a given users are allowed to
%% log in
%% Defaults to infinity
get_max_user_sessions(LUser, Host) ->
case acl:match_rule(
Host, max_user_sessions, exmpp_jid:make_bare_jid(LUser, Host)) of
Max when is_integer(Max) -> Max;
infinity -> infinity;
_ -> ?MAX_USER_SESSIONS
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
process_iq(From, To, Packet) ->
case exmpp_iq:xmlel_to_iq(Packet) of
#iq{kind = request, ns = XMLNS} = IQ_Rec ->
Host = To#jid.ldomain,
case ets:lookup(sm_iqtable, {XMLNS, Host}) of
[{_, Module, Function}] ->
ResIQ = Module:Function(From, To, IQ_Rec),
if
ResIQ /= ignore ->
Reply = exmpp_iq:iq_to_xmlel(ResIQ, To, From),
ejabberd_router:route(To, From, Reply);
true ->
ok
end;
[{_, Module, Function, Opts}] ->
gen_iq_handler:handle(Host, Module, Function, Opts,
From, To, IQ_Rec);
[] ->
Err = exmpp_iq:error(Packet, 'service-unavailable'),
ejabberd_router:route(To, From, Err)
end;
#iq{type = response} ->
ok;
_ ->
Err = exmpp_iq:error(Packet, 'bad-request'),
ejabberd_router:route(To, From, Err),
ok
end.
ctl_process(_Val, ["connected-users"]) ->
USRs = dirty_get_sessions_list(),
NewLine = io_lib:format("~n", []),
SUSRs = lists:sort(USRs),
FUSRs = lists:map(fun({U, S, R}) -> [U, $@, S, $/, R, NewLine] end, SUSRs),
?PRINT("~s", [FUSRs]),
{stop, ?STATUS_SUCCESS};
ctl_process(_Val, ["connected-users-number"]) ->
N = length(dirty_get_sessions_list()),
?PRINT("~p~n", [N]),
{stop, ?STATUS_SUCCESS};
ctl_process(_Val, ["user-resources", User, Server]) ->
Resources = get_user_resources(User, Server),
NewLine = io_lib:format("~n", []),
SResources = lists:sort(Resources),
FResources = lists:map(fun(R) -> [R, NewLine] end, SResources),
?PRINT("~s", [FResources]),
{stop, ?STATUS_SUCCESS};
ctl_process(Val, _Args) ->
Val.
update_tables() ->
case catch mnesia:table_info(session, attributes) of
[ur, user, node] ->
mnesia:delete_table(session);
[ur, user, pid] ->
mnesia:delete_table(session);
[usr, us, pid] ->
mnesia:delete_table(session);
[sid, usr, us, priority] ->
mnesia:delete_table(session);
[sid, usr, us, priority, info] ->
ok;
{'EXIT', _} ->
ok
end,
case lists:member(presence, mnesia:system_info(tables)) of
true ->
mnesia:delete_table(presence);
false ->
ok
end,
case lists:member(local_session, mnesia:system_info(tables)) of
true ->
mnesia:delete_table(local_session);
false ->
ok
end.
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