%%%-------------------------------------------------------------------
%%% @author Evgeny Khramtsov <ekhramtsov@process-one.net>
%%% @copyright (C) 2015, Evgeny Khramtsov
%%% @doc
%%%
%%% @end
%%% Created : 9 Mar 2015 by Evgeny Khramtsov <ekhramtsov@process-one.net>
%%%-------------------------------------------------------------------
-module(ejabberd_sm_mnesia).
-behaviour(gen_server).
-behaviour(ejabberd_sm).
%% API
-export([init/0,
set_session/1,
delete_session/4,
get_sessions/0,
get_sessions/1,
get_sessions/2,
get_sessions/3]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-include("ejabberd.hrl").
-include("ejabberd_sm.hrl").
-include("jlib.hrl").
-include_lib("stdlib/include/ms_transform.hrl").
-record(state, {}).
%%%===================================================================
%%% API
%%%===================================================================
-spec init() -> ok | {error, any()}.
init() ->
case gen_server:start_link({local, ?MODULE}, ?MODULE, [], []) of
{ok, _Pid} ->
ok;
Err ->
Err
end.
-spec set_session(#session{}) -> ok.
set_session(Session) ->
mnesia:dirty_write(Session).
-spec delete_session(binary(), binary(), binary(), sid()) ->
{ok, #session{}} | {error, notfound}.
delete_session(_LUser, _LServer, _LResource, SID) ->
case mnesia:dirty_read(session, SID) of
[Session] ->
mnesia:dirty_delete(session, SID),
{ok, Session};
[] ->
{error, notfound}
end.
-spec get_sessions() -> [#session{}].
get_sessions() ->
ets:tab2list(session).
-spec get_sessions(binary()) -> [#session{}].
get_sessions(LServer) ->
mnesia:dirty_select(session,
[{#session{usr = '$1', _ = '_'},
[{'==', {element, 2, '$1'}, LServer}], ['$_']}]).
-spec get_sessions(binary(), binary()) -> [#session{}].
get_sessions(LUser, LServer) ->
mnesia:dirty_index_read(session, {LUser, LServer}, #session.us).
-spec get_sessions(binary(), binary(), binary()) -> [#session{}].
get_sessions(LUser, LServer, LResource) ->
mnesia:dirty_index_read(session, {LUser, LServer, LResource}, #session.usr).
%%%===================================================================
%%% gen_server callbacks
%%%===================================================================
init([]) ->
update_tables(),
mnesia:create_table(session,
[{ram_copies, [node()]},
{attributes, record_info(fields, session)}]),
mnesia:create_table(session_counter,
[{ram_copies, [node()]},
{attributes, record_info(fields, session_counter)}]),
mnesia:add_table_index(session, usr),
mnesia:add_table_index(session, us),
mnesia:add_table_copy(session, node(), ram_copies),
mnesia:add_table_copy(session_counter, node(), ram_copies),
mnesia:subscribe(system),
{ok, #state{}}.
handle_call(_Request, _From, State) ->
Reply = ok,
{reply, Reply, State}.
handle_cast(_Msg, State) ->
{noreply, State}.
handle_info({mnesia_system_event, {mnesia_down, Node}}, State) ->
ets:select_delete(
session,
ets:fun2ms(
fun(#session{sid = {_, Pid}}) ->
node(Pid) == Node
end)),
{noreply, State};
handle_info(_Info, State) ->
{noreply, State}.
terminate(_Reason, _State) ->
ok.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
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);
[usr, us, sid, priority, info] -> 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.
