Line data    Source code

       1             : /*
       2             :   This file is part of TALER
       3             :   Copyright (C) 2019 Taler Systems SA
       4             : 
       5             :   TALER is free software; you can redistribute it and/or modify it under the
       6             :   terms of the GNU Lesser General Public License as published by the Free Software
       7             :   Foundation; either version 3, or (at your option) any later version.
       8             : 
       9             :   TALER is distributed in the hope that it will be useful, but WITHOUT ANY
      10             :   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
      11             :   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
      12             : 
      13             :   You should have received a copy of the GNU General Public License along with
      14             :   TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
      15             : */
      16             : /**
      17             :  * @file syncdb/sync_db_plugin.c
      18             :  * @brief Logic to load database plugin
      19             :  * @author Christian Grothoff
      20             :  * @author Sree Harsha Totakura <sreeharsha@totakura.in>
      21             :  */
      22             : #include "platform.h"
      23             : #include "sync_database_plugin.h"
      24             : #include <ltdl.h>
      25             : 
      26             : 
      27             : /**
      28             :  * Initialize the plugin.
      29             :  *
      30             :  * @param cfg configuration to use
      31             :  * @return #GNUNET_OK on success
      32             :  */
      33             : struct SYNC_DatabasePlugin *
      34           2 : SYNC_DB_plugin_load (const struct GNUNET_CONFIGURATION_Handle *cfg)
      35             : {
      36             :   char *plugin_name;
      37             :   char *lib_name;
      38             :   struct GNUNET_CONFIGURATION_Handle *cfg_dup;
      39             :   struct SYNC_DatabasePlugin *plugin;
      40             : 
      41           2 :   if (GNUNET_SYSERR ==
      42           2 :       GNUNET_CONFIGURATION_get_value_string (cfg,
      43             :                                              "sync",
      44             :                                              "db",
      45             :                                              &plugin_name))
      46             :   {
      47           0 :     GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
      48             :                                "sync",
      49             :                                "db");
      50           0 :     return NULL;
      51             :   }
      52           2 :   (void) GNUNET_asprintf (&lib_name,
      53             :                           "libsync_plugin_db_%s",
      54             :                           plugin_name);
      55           2 :   GNUNET_free (plugin_name);
      56           2 :   cfg_dup = GNUNET_CONFIGURATION_dup (cfg);
      57           2 :   plugin = GNUNET_PLUGIN_load (lib_name, cfg_dup);
      58           2 :   if (NULL != plugin)
      59           2 :     plugin->library_name = lib_name;
      60             :   else
      61           0 :     GNUNET_free (lib_name);
      62           2 :   GNUNET_CONFIGURATION_destroy (cfg_dup);
      63           2 :   return plugin;
      64             : }
      65             : 
      66             : 
      67             : /**
      68             :  * Shutdown the plugin.
      69             :  *
      70             :  * @param plugin the plugin to unload
      71             :  */
      72             : void
      73           2 : SYNC_DB_plugin_unload (struct SYNC_DatabasePlugin *plugin)
      74             : {
      75             :   char *lib_name;
      76             : 
      77           2 :   if (NULL == plugin)
      78           0 :     return;
      79           2 :   lib_name = plugin->library_name;
      80           2 :   GNUNET_assert (NULL == GNUNET_PLUGIN_unload (lib_name,
      81             :                                                plugin));
      82           2 :   GNUNET_free (lib_name);
      83             : }
      84             : 
      85             : 
      86             : /**
      87             :  * Libtool search path before we started.
      88             :  */
      89             : static char *old_dlsearchpath;
      90             : 
      91             : 
      92             : /**
      93             :  * Setup libtool paths.
      94             :  */
      95             : void __attribute__ ((constructor))
      96           1 : plugin_init ()
      97             : {
      98             :   int err;
      99             :   const char *opath;
     100             :   char *path;
     101             :   char *cpath;
     102             : 
     103           1 :   err = lt_dlinit ();
     104           1 :   if (err > 0)
     105             :   {
     106           0 :     fprintf (stderr,
     107             :              _ ("Initialization of plugin mechanism failed: %s!\n"),
     108             :              lt_dlerror ());
     109           0 :     return;
     110             :   }
     111           1 :   opath = lt_dlgetsearchpath ();
     112           1 :   if (NULL != opath)
     113           0 :     old_dlsearchpath = GNUNET_strdup (opath);
     114           1 :   path = GNUNET_OS_installation_get_path (GNUNET_OS_IPK_LIBDIR);
     115           1 :   if (NULL != path)
     116             :   {
     117           1 :     if (NULL != opath)
     118             :     {
     119           0 :       GNUNET_asprintf (&cpath, "%s:%s", opath, path);
     120           0 :       lt_dlsetsearchpath (cpath);
     121           0 :       GNUNET_free (path);
     122           0 :       GNUNET_free (cpath);
     123             :     }
     124             :     else
     125             :     {
     126           1 :       lt_dlsetsearchpath (path);
     127           1 :       GNUNET_free (path);
     128             :     }
     129             :   }
     130             : }
     131             : 
     132             : 
     133             : /**
     134             :  * Shutdown libtool.
     135             :  */
     136             : void __attribute__ ((destructor))
     137           1 : plugin_fini ()
     138             : {
     139           1 :   lt_dlsetsearchpath (old_dlsearchpath);
     140           1 :   if (NULL != old_dlsearchpath)
     141             :   {
     142           0 :     GNUNET_free (old_dlsearchpath);
     143           0 :     old_dlsearchpath = NULL;
     144             :   }
     145           1 :   lt_dlexit ();
     146           1 : }
     147             : 
     148             : 
     149             : /* end of sync_db_plugin.c */