131 lines
3.9 KiB
Erlang
131 lines
3.9 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_rdbms.erl
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%%% Author : Mickael Remond <mickael.remond@process-one.net>
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%%% Purpose : Manage the start of the database modules when needed
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%%% Created : 31 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2012 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License
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%%% along with this program; if not, write to the Free Software
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%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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%%% 02111-1307 USA
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%%%
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%%%----------------------------------------------------------------------
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-module(ejabberd_rdbms).
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-author('alexey@process-one.net').
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-export([start/0
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,start_odbc/1
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,stop_odbc/1
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,running/1
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]).
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-include("ejabberd.hrl").
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-include("ejabberd_config.hrl").
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-include_lib("stdlib/include/ms_transform.hrl").
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-define(SUPERVISOR, ejabberd_sup).
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start() ->
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%% Check if ejabberd has been compiled with ODBC
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case catch ejabberd_odbc_sup:module_info() of
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{'EXIT',{undef,_}} ->
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?INFO_MSG("ejabberd has not been compiled with relational database support. Skipping database startup.", []);
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_ ->
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%% If compiled with ODBC, start ODBC on the needed host
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start_hosts()
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end.
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%% Start relationnal DB module on the nodes where it is needed
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start_hosts() ->
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lists:foreach(
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fun(Host) ->
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case needs_odbc(Host) of
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true -> start_odbc(Host);
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false -> ok
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end
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end, ?MYHOSTS).
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%% Start the ODBC module on the given host
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start_odbc(Host) ->
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SupervisorName = sup_name(Host),
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ChildSpec =
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{SupervisorName,
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{ejabberd_odbc_sup, start_link, [Host]},
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transient,
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infinity,
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supervisor,
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[ejabberd_odbc_sup]},
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case supervisor:start_child(?SUPERVISOR, ChildSpec) of
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{ok, _PID} ->
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ok;
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_Error ->
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?ERROR_MSG("Start of supervisor ~p failed:~n~p~nRetrying...~n", [SupervisorName, _Error]),
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start_odbc(Host)
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end.
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stop_odbc(Host) ->
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SupervisorName = sup_name(Host),
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case running(Host) of
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false -> ok;
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true ->
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case [H || H <- dependent_hosts(Host), ejabberd_hosts:running(H)] of
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[] ->
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?INFO_MSG("About to terminate ~p", [SupervisorName]),
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ok = supervisor:terminate_child(?SUPERVISOR, SupervisorName),
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ok = supervisor:delete_child(?SUPERVISOR, SupervisorName);
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RunningHosts ->
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?WARNING_MSG("Not stopping ODBC for ~p because the virtual hosts ~p are still using it.",
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[Host, RunningHosts]),
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{error, still_in_use}
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end
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end.
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%% Returns true if we have configured odbc_server for the given host
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needs_odbc(Host) ->
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try
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LHost = exmpp_stringprep:nameprep(Host),
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case ejabberd_config:get_local_option({odbc_server, LHost}) of
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undefined ->
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false;
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{host, _} ->
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false;
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_ ->
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true
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end
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catch
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_ ->
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false
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end.
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running(Host) ->
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Supervisors = supervisor:which_children(?SUPERVISOR),
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SupervisorName = gen_mod:get_module_proc(Host, ejabberd_odbc_sup),
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case lists:keysearch(SupervisorName, 1, Supervisors) of
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false -> false;
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{value, Cspec} when is_tuple(Cspec) -> true
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end.
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dependent_hosts(Host) ->
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MS = ets:fun2ms(fun (#local_config{key={odbc_server, DHost},
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value={host, H}})
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when H =:= Host ->
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DHost
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end),
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ejabberd_config:search(MS).
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sup_name(Host) ->
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gen_mod:get_module_proc(Host, ejabberd_odbc_sup).
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