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/*
* Copyright (C) 2010 Guido Guenther <agx@sigxcpu.org>
*
* 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, 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, see <http://www.gnu.org/licenses/>.
*/
#include "ka-plugin-loader.h"
#include "ka-plugin.h"
#include "ka-settings.h"
#include "ka-applet-priv.h"
#include <gmodule.h>
G_DEFINE_TYPE (KaPluginLoader, ka_plugin_loader, G_TYPE_OBJECT)
#define GET_PRIVATE(o) \
(G_TYPE_INSTANCE_GET_PRIVATE ((o), KA_TYPE_PLUGIN_LOADER, KaPluginLoaderPrivate))
typedef struct _KaPluginLoaderPrivate KaPluginLoaderPrivate;
struct _KaPluginLoaderPrivate {
KaApplet *applet;
GSList *active_plugins;
};
static KaPlugin*
load_plugin (const char *path)
{
KaPlugin *plugin = NULL;
GModule *module;
KaPluginCreateFunc plugin_create_func;
int *major_plugin_version, *minor_plugin_version;
module = g_module_open (path, G_MODULE_BIND_LAZY);
if (!module) {
g_warning ("Could not load plugin %s: %s", path, g_module_error ());
return NULL;
}
if (!g_module_symbol (module, "ka_plugin_major_version",(gpointer *) &major_plugin_version)) {
g_warning ("Could not load plugin %s: Missing major version info", path);
goto out;
}
if (*major_plugin_version != KA_PLUGIN_MAJOR_VERSION) {
g_warning ("Could not load plugin %s: Plugin major version %d, %d is required",
path, *major_plugin_version, KA_PLUGIN_MAJOR_VERSION);
goto out;
}
if (!g_module_symbol (module, "ka_plugin_minor_version", (gpointer *) &minor_plugin_version)) {
g_warning ("Could not load plugin %s: Missing minor version info", path);
goto out;
}
if (*minor_plugin_version != KA_PLUGIN_MINOR_VERSION) {
g_warning ("Could not load plugin %s: Plugin minor version %d, %d is required",
path, *minor_plugin_version, KA_PLUGIN_MINOR_VERSION);
goto out;
}
if (!g_module_symbol (module, "ka_plugin_create", (gpointer *) &plugin_create_func)) {
g_warning ("Could not load plugin %s: %s", path, g_module_error ());
goto out;
}
plugin = (*plugin_create_func) ();
if (plugin) {
g_object_weak_ref (G_OBJECT (plugin), (GWeakNotify) g_module_close, module);
g_message ("Loaded plugin %s", ka_plugin_get_name (plugin));
} else
g_warning ("Could not load plugin %s: initialization failed", path);
out:
if (!plugin)
g_module_close (module);
return plugin;
}
static void
load_plugins (KaPluginLoader *self)
{
int i;
KaPluginLoaderPrivate *priv = GET_PRIVATE (self);
GSettings *settings;
char **plugins = NULL;
if (!g_module_supported ()) {
g_warning ("GModules are not supported on your platform!");
return;
}
settings = g_settings_get_child(ka_applet_get_settings (priv->applet),
KA_SETTING_CHILD_PLUGINS);
/* For now we only load the plugins on program startup */
plugins = g_settings_get_strv(settings,
KA_SETTING_KEY_PLUGINS_ENABLED);
if (!plugins) {
g_message ("No plugins to load");
return;
}
for (i = 0; plugins[i]; i++) {
char *path;
char *fname;
KaPlugin *plugin;
fname = g_strdup_printf("libka-plugin-%s.%s",
plugins[i],
G_MODULE_SUFFIX);
path = g_module_build_path (KA_PLUGINS_DIR, fname);
plugin = load_plugin (path);
if (plugin) {
ka_plugin_activate(plugin, priv->applet);
priv->active_plugins = g_slist_prepend (priv->active_plugins, plugin);
}
g_free (fname);
g_free (path);
}
g_strfreev (plugins);
g_object_unref (settings);
}
static void
deactivate_plugin(gpointer plugin, gpointer user_data)
{
KaApplet *applet = KA_APPLET (user_data);
KA_DEBUG ("Deactivating plugin %s", ka_plugin_get_name (plugin));
ka_plugin_deactivate (plugin, applet);
}
static void
ka_plugin_loader_dispose(GObject *object)
{
KaPluginLoader *self = KA_PLUGIN_LOADER(object);
KaPluginLoaderPrivate *priv = GET_PRIVATE (self);
GObjectClass *parent_class = G_OBJECT_CLASS (ka_plugin_loader_parent_class);
/* We need to do this before dropping the ref on applet */
g_slist_foreach (priv->active_plugins, deactivate_plugin, priv->applet);
g_slist_free (priv->active_plugins);
if (priv->applet)
priv->applet = NULL;
if (parent_class->dispose != NULL)
parent_class->dispose (object);
}
static void
ka_plugin_loader_class_init (KaPluginLoaderClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS(klass);
object_class->dispose = ka_plugin_loader_dispose;
g_type_class_add_private (klass, sizeof (KaPluginLoaderPrivate));
}
static void
ka_plugin_loader_init (KaPluginLoader *self)
{
KaPluginLoaderPrivate *priv = GET_PRIVATE (self);
priv->active_plugins = NULL;
}
static KaPluginLoader*
ka_plugin_loader_new (void)
{
return g_object_new (KA_TYPE_PLUGIN_LOADER, NULL);
}
KaPluginLoader*
ka_plugin_loader_create (KaApplet* applet)
{
KaPluginLoader *loader;
KaPluginLoaderPrivate *priv;
loader = ka_plugin_loader_new();
priv = GET_PRIVATE (loader);
priv->applet = applet;
load_plugins (loader);
return loader;
}
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