src/plugin.c

   1 /**
   2 *
   3 * Teleport plugin management
   4 *
   5 * plugin.c
   6 *
   7 * Copyright : (C) 2007 by Diogo Ferreira <diogo@underdev.org>
   8 *             (C) 2007 by João Oliveirinha <joliveirinha@floodbit.org>
   9 *
  10 *
  11 * This program is free software; you can redistribute it and/or
  12 * modify it under the terms of the GNU General Public License
  13 * as published by the Free Software Foundation; either version 3
  14 * of the License, or (at your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 *
  21 **/
  22
  23 #include "teleport-private.h"
  24 #include "teleport.h"
  25
  26 GList *pluginList = NULL;
  27
  28 TeleportPlugin *
  29 teleport_load_plugin (const gchar* name)
  30 {
  31         TeleportPlugin *plug;
  32         GModule *dlm;
  33         gchar* pluginPath;
  34
  35         g_log (NULL, G_LOG_LEVEL_DEBUG, "%s: Attempting to load", name);
  36
  37         if (!g_module_supported())
  38         {
  39                 g_log (NULL, G_LOG_LEVEL_DEBUG, "%s: This platform doesn't support modules", name);
  40                 return NULL;
  41         }
  42
  43         plug = g_new (TeleportPlugin, 1);
  44
  45         pluginPath = g_module_build_path ("plugins",name);
  46
  47         g_log (NULL, G_LOG_LEVEL_DEBUG, "%s: Loading %s", name, pluginPath);
  48
  49         dlm = g_module_open (pluginPath, G_MODULE_BIND_LAZY);
  50         if (dlm)
  51         {
  52                 GetVTableProc getVTable;
  53                 int (*getAbi)();
  54
  55                 g_log (NULL, G_LOG_LEVEL_DEBUG, "%s: Loaded", name);
  56
  57                 if (!g_module_symbol(dlm, "teleport_get_abi", (gpointer)(&getAbi))
  58                         || (*getAbi)() != TELEPORT_ABI)
  59                 {
  60                         g_log (NULL, G_LOG_LEVEL_DEBUG, "%s: ABI mismatch, recompile the plugin", name);
  61                         g_module_close (dlm);
  62                         g_free (pluginPath);
  63                         g_free (plug);
  64
  65                         return NULL;
  66
  67                 }
  68
  69                 if (!g_module_symbol(dlm, "teleport_get_vtable", (gpointer)(&getVTable)))
  70                 {
  71                         g_log (NULL, G_LOG_LEVEL_DEBUG, "%s: Unable to find teleportGetVTable", name);
  72                         g_module_close (dlm);
  73                         g_free (pluginPath);
  74                         g_free (plug);
  75
  76                         return NULL;
  77                 }
  78
  79
  80                 plug->priority = 0;
  81                 plug->modulePtr = dlm;
  82                 plug->vTable = (*getVTable) ();
  83
  84                 g_log (NULL, G_LOG_LEVEL_DEBUG, "%s: VTable loaded", name);
  85
  86                 if (!(*plug->vTable->initPlugin) (plug))
  87                 {
  88                         g_log (NULL, G_LOG_LEVEL_DEBUG, "%s: unable to init plugin",name);
  89                         g_module_close (dlm);
  90                         g_free (pluginPath);
  91                         g_free (plug);
  92                         return NULL;
  93                 }
  94
  95                 pluginList = g_list_append (pluginList, plug);
  96         }
  97         else {
  98                 g_log (NULL, G_LOG_LEVEL_DEBUG, "%s: Unable to load %s", name,pluginPath);
  99                 g_free (plug);
 100         }
 101
 102         g_free (pluginPath);
 103
 104         return plug;
 105 }
 106
 107 void
 108 teleport_unload_plugin (TeleportPlugin *plug)
 109 {
 110         (*plug->vTable->finiPlugin) (plug);
 111
 112         pluginList = g_list_remove (pluginList, (gpointer)plug);
 113
 114         g_module_close (plug->modulePtr);
 115
 116         free (plug);
 117 }
 118
 119 void
 120 teleport_traverse_plugins ()
 121 {
 122         GList *iterator;
 123         for (iterator = pluginList; iterator; iterator = iterator->next)
 124         {
 125                 TeleportPlugin *plug = (TeleportPlugin*)iterator->data;
 126                 g_print ("Priority: %d\n",plug->priority);
 127                 g_print ("Loaded: %s\n",plug->vTable->name);
 128         }
 129 }
 130
 131 void
 132 teleport_perform_query (const gchar *s)
 133 {
 134         GList *iterator;
 135         GSList *queryResult;
 136         for (iterator = pluginList; iterator; iterator = iterator->next)
 137         {
 138                 TeleportPlugin *plug = (TeleportPlugin*)iterator->data;
 139
 140                 if (plug->vTable->cancelQuery)
 141                         (*plug->vTable->cancelQuery)();
 142
 143                 queryResult = (*plug->vTable->query) (plug, s);
 144                 if (queryResult) /* Possible sync returns */
 145                 {
 146                         teleport_trigger_query_update (queryResult);
 147                 }
 148         }
 149 }
 150
 151 void
 152 teleport_do_action (TeleportAction *action)
 153 {
 154         (*(action->backend->vTable->doAction))(action);
 155 }