%%%-------------------------------------------------------------------
%%% File : ejabberd_sm_sql.erl
%%% Author : Evgeny Khramtsov <ekhramtsov@process-one.net>
%%% Created : 9 Mar 2015 by Evgeny Khramtsov <ekhramtsov@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2022 ProcessOne
%%%
%%% 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.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%----------------------------------------------------------------------
-module(ejabberd_sm_sql).
-behaviour(ejabberd_sm).
%% API
-export([init/0,
set_session/1,
delete_session/1,
get_sessions/0,
get_sessions/1,
get_sessions/2]).
-include("ejabberd_sm.hrl").
-include("logger.hrl").
-include("ejabberd_sql_pt.hrl").
%%%===================================================================
%%% API
%%%===================================================================
-spec init() -> ok | {error, any()}.
init() ->
Node = erlang:atom_to_binary(node(), latin1),
?DEBUG("Cleaning SQL SM table...", []),
lists:foldl(
fun(Host, ok) ->
case ejabberd_sql:sql_query(
Host, ?SQL("delete from sm where node=%(Node)s")) of
{updated, _} ->
ok;
Err ->
?ERROR_MSG("Failed to clean 'sm' table: ~p", [Err]),
{error, db_failure}
end;
(_, Err) ->
Err
end, ok, ejabberd_sm:get_vh_by_backend(?MODULE)).
set_session(#session{sid = {Now, Pid}, usr = {U, LServer, R},
priority = Priority, info = Info}) ->
InfoS = misc:term_to_expr(Info),
PrioS = enc_priority(Priority),
TS = now_to_timestamp(Now),
PidS = misc:encode_pid(Pid),
Node = erlang:atom_to_binary(node(Pid), latin1),
case ?SQL_UPSERT(LServer, "sm",
["!usec=%(TS)d",
"!pid=%(PidS)s",
"node=%(Node)s",
"username=%(U)s",
"server_host=%(LServer)s",
"resource=%(R)s",
"priority=%(PrioS)s",
"info=%(InfoS)s"]) of
ok ->
ok;
_Err ->
{error, db_failure}
end.
delete_session(#session{usr = {_, LServer, _}, sid = {Now, Pid}}) ->
TS = now_to_timestamp(Now),
PidS = list_to_binary(erlang:pid_to_list(Pid)),
case ejabberd_sql:sql_query(
LServer,
?SQL("delete from sm where usec=%(TS)d and pid=%(PidS)s")) of
{updated, _} ->
ok;
_Err ->
{error, db_failure}
end.
get_sessions() ->
lists:flatmap(
fun(LServer) ->
get_sessions(LServer)
end, ejabberd_sm:get_vh_by_backend(?MODULE)).
get_sessions(LServer) ->
case ejabberd_sql:sql_query(
LServer,
?SQL("select @(usec)d, @(pid)s, @(node)s, @(username)s,"
" @(resource)s, @(priority)s, @(info)s from sm"
" where %(LServer)H")) of
{selected, Rows} ->
lists:flatmap(
fun(Row) ->
try [row_to_session(LServer, Row)]
catch _:{bad_node, _} -> []
end
end, Rows);
_Err ->
[]
end.
get_sessions(LUser, LServer) ->
case ejabberd_sql:sql_query(
LServer,
?SQL("select @(usec)d, @(pid)s, @(node)s, @(username)s,"
" @(resource)s, @(priority)s, @(info)s from sm"
" where username=%(LUser)s and %(LServer)H")) of
{selected, Rows} ->
{ok, lists:flatmap(
fun(Row) ->
try [row_to_session(LServer, Row)]
catch _:{bad_node, _} -> []
end
end, Rows)};
_Err ->
{error, db_failure}
end.
%%%===================================================================
%%% Internal functions
%%%===================================================================
now_to_timestamp({MSec, Sec, USec}) ->
(MSec * 1000000 + Sec) * 1000000 + USec.
timestamp_to_now(I) ->
Head = I div 1000000,
USec = I rem 1000000,
MSec = Head div 1000000,
Sec = Head rem 1000000,
{MSec, Sec, USec}.
dec_priority(Prio) ->
case catch binary_to_integer(Prio) of
{'EXIT', _} ->
undefined;
Int ->
Int
end.
enc_priority(undefined) ->
<<"">>;
enc_priority(Int) when is_integer(Int) ->
integer_to_binary(Int).
row_to_session(LServer, {USec, PidS, NodeS, User, Resource, PrioS, InfoS}) ->
Now = timestamp_to_now(USec),
Pid = misc:decode_pid(PidS, NodeS),
Priority = dec_priority(PrioS),
Info = ejabberd_sql:decode_term(InfoS),
#session{sid = {Now, Pid}, us = {User, LServer},
usr = {User, LServer, Resource},
priority = Priority,
info = Info}.
