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%%%----------------------------------------------------------------------
%%% 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) 2002-2012 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., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%----------------------------------------------------------------------
-module(ejabberd_rdbms).
-author('alexey@process-one.net').
-export([start/0]).
-include("ejabberd.hrl").
start() ->
%% Check if ejabberd has been compiled with ODBC
case catch ejabberd_odbc_sup:module_info() of
{'EXIT',{undef,_}} ->
?INFO_MSG("ejabberd has not been compiled with relational database support. Skipping database startup.", []);
_ ->
%% If compiled with ODBC, start ODBC on the needed host
start_hosts()
end.
%% Start relationnal DB module on the nodes where it is needed
start_hosts() ->
lists:foreach(
fun(Host) ->
case needs_odbc(Host) of
true -> start_odbc(Host);
false -> ok
end
end, ?MYHOSTS).
%% Start the ODBC module on the given host
start_odbc(Host) ->
Supervisor_name = gen_mod:get_module_proc(Host, ejabberd_odbc_sup),
ChildSpec =
{Supervisor_name,
{ejabberd_odbc_sup, start_link, [Host]},
transient,
infinity,
supervisor,
[ejabberd_odbc_sup]},
case supervisor:start_child(ejabberd_sup, ChildSpec) of
{ok, _PID} ->
ok;
_Error ->
?ERROR_MSG("Start of supervisor ~p failed:~n~p~nRetrying...~n", [Supervisor_name, _Error]),
start_odbc(Host)
end.
%% Returns true if we have configured odbc_server for the given host
needs_odbc(Host) ->
LHost = jlib:nameprep(Host),
case ejabberd_config:get_local_option({odbc_server, LHost}) of
undefined ->
false;
_ -> true
end.
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