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/*
This file is part of TALER
Copyright (C) 2015, 2016, 2020 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER 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
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file merchantdb/merchantdb_plugin.c
* @brief Logic to load database plugin
* @author Christian Grothoff
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
*/
#include "platform.h"
#include <taler/taler_util.h>
#include "taler_merchantdb_plugin.h"
#include "taler_merchantdb_lib.h"
#include <ltdl.h>
/**
* Initialize the plugin.
*
* @param[in,out] cfg configuration to use
* @param reset_db should the DB be reset on load?
* @return #GNUNET_OK on success
*/
struct TALER_MERCHANTDB_Plugin *
TALER_MERCHANTDB_plugin_load (const struct GNUNET_CONFIGURATION_Handle *cfg,
bool reset_db)
{
char *plugin_name;
char *lib_name;
struct TALER_MERCHANTDB_Plugin *plugin;
if (GNUNET_SYSERR ==
GNUNET_CONFIGURATION_get_value_string (cfg,
"merchant",
"db",
&plugin_name))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
"merchant",
"db");
return NULL;
}
(void) GNUNET_asprintf (&lib_name,
"libtaler_plugin_merchantdb_%s",
plugin_name);
GNUNET_free (plugin_name);
plugin = GNUNET_PLUGIN_load (lib_name,
(void *) cfg);
if (NULL == plugin)
{
GNUNET_free (lib_name);
return NULL;
}
plugin->library_name = lib_name;
if (reset_db)
{
if (GNUNET_OK !=
plugin->connect (plugin->cls,
true))
{
TALER_MERCHANTDB_plugin_unload (plugin);
return NULL;
}
(void) plugin->drop_tables (plugin->cls);
}
if (GNUNET_OK !=plugin->connect (plugin->cls,
false))
{
TALER_MERCHANTDB_plugin_unload (plugin);
return NULL;
}
return plugin;
}
/**
* Shutdown the plugin.
*
* @param plugin the plugin to unload
*/
void
TALER_MERCHANTDB_plugin_unload (struct TALER_MERCHANTDB_Plugin *plugin)
{
char *lib_name;
if (NULL == plugin)
return;
lib_name = plugin->library_name;
GNUNET_assert (NULL == GNUNET_PLUGIN_unload (lib_name,
plugin));
GNUNET_free (lib_name);
}
/**
* Libtool search path before we started.
*/
static char *old_dlsearchpath;
/**
* Setup libtool paths.
*/
void __attribute__ ((constructor))
plugin_init (void)
{
int err;
const char *opath;
char *path;
char *cpath;
err = lt_dlinit ();
if (err > 0)
{
fprintf (stderr,
_ ("Initialization of plugin mechanism failed: %s!\n"),
lt_dlerror ());
return;
}
opath = lt_dlgetsearchpath ();
if (NULL != opath)
old_dlsearchpath = GNUNET_strdup (opath);
path = GNUNET_OS_installation_get_path (GNUNET_OS_IPK_LIBDIR);
if (NULL != path)
{
if (NULL != opath)
{
GNUNET_asprintf (&cpath, "%s:%s", opath, path);
lt_dlsetsearchpath (cpath);
GNUNET_free (path);
GNUNET_free (cpath);
}
else
{
lt_dlsetsearchpath (path);
GNUNET_free (path);
}
}
}
/**
* Shutdown libtool.
*/
void __attribute__ ((destructor))
plugin_fini (void)
{
lt_dlsetsearchpath (old_dlsearchpath);
if (NULL != old_dlsearchpath)
{
GNUNET_free (old_dlsearchpath);
old_dlsearchpath = NULL;
}
lt_dlexit ();
}
/* end of merchantdb_plugin.c */
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