%%%----------------------------------------------------------------------
%%% File : ejabberd_rdbms.erl
%%% Author : Mickael Remond <mickael.remond@process-one.net>
%%% Purpose : Manage the start of the database modules when needed
%%% Created : 31 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2018 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_rdbms).
-behaviour(supervisor).
-behaviour(ejabberd_config).
-author('alexey@process-one.net').
-export([start_link/0, init/1, opt_type/1,
config_reloaded/0, start_host/1, stop_host/1]).
-include("ejabberd.hrl").
-include("logger.hrl").
start_link() ->
supervisor:start_link({local, ?MODULE}, ?MODULE, []).
init([]) ->
file:delete(ejabberd_sql:freetds_config()),
file:delete(ejabberd_sql:odbc_config()),
file:delete(ejabberd_sql:odbcinst_config()),
ejabberd_hooks:add(host_up, ?MODULE, start_host, 20),
ejabberd_hooks:add(host_down, ?MODULE, stop_host, 90),
ejabberd_hooks:add(config_reloaded, ?MODULE, config_reloaded, 20),
{ok, {{one_for_one, 10, 1}, get_specs()}}.
-spec get_specs() -> [supervisor:child_spec()].
get_specs() ->
lists:flatmap(
fun(Host) ->
case get_spec(Host) of
{ok, Spec} -> [Spec];
undefined -> []
end
end, ?MYHOSTS).
-spec get_spec(binary()) -> {ok, supervisor:child_spec()} | undefined.
get_spec(Host) ->
case needs_sql(Host) of
{true, App} ->
ejabberd:start_app(App),
SupName = gen_mod:get_module_proc(Host, ejabberd_sql_sup),
{ok, {SupName, {ejabberd_sql_sup, start_link, [Host]},
transient, infinity, supervisor, [ejabberd_sql_sup]}};
false ->
undefined
end.
-spec config_reloaded() -> ok.
config_reloaded() ->
lists:foreach(fun start_host/1, ?MYHOSTS).
-spec start_host(binary()) -> ok.
start_host(Host) ->
case get_spec(Host) of
{ok, Spec} ->
case supervisor:start_child(?MODULE, Spec) of
{ok, _PID} ->
ok;
{error, {already_started, _}} ->
ok;
{error, _} = Err ->
erlang:error(Err)
end;
undefined ->
ok
end.
-spec stop_host(binary()) -> ok.
stop_host(Host) ->
SupName = gen_mod:get_module_proc(Host, ejabberd_sql_sup),
supervisor:terminate_child(?MODULE, SupName),
supervisor:delete_child(?MODULE, SupName),
ok.
%% Returns {true, App} if we have configured sql for the given host
needs_sql(Host) ->
LHost = jid:nameprep(Host),
case ejabberd_config:get_option({sql_type, LHost}, undefined) of
mysql -> {true, p1_mysql};
pgsql -> {true, p1_pgsql};
sqlite -> {true, sqlite3};
mssql -> {true, odbc};
odbc -> {true, odbc};
undefined -> false
end.
-type sql_type() :: mysql | pgsql | sqlite | mssql | odbc.
-spec opt_type(sql_type) -> fun((sql_type()) -> sql_type());
(atom()) -> [atom()].
opt_type(sql_type) ->
fun (mysql) -> mysql;
(pgsql) -> pgsql;
(sqlite) -> sqlite;
(mssql) -> mssql;
(odbc) -> odbc
end;
opt_type(_) -> [sql_type].
