src/mm-dbus-manager.c

   1 /* MManager - a Desktop wide manager for multimedia applications.
   2  *
   3  * Copyright (C) 2008 Cosimo Cecchi <cosimoc@gnome.org>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <stdlib.h>
  22 #include <glib.h>
  23 #include <glib-object.h>
  24 #include <dbus/dbus-glib.h>
  25 #include <dbus/dbus-glib-bindings.h>
  26 #include "mm-dbus-manager.h"
  27 #include "mm-dbus-manager-type-builtins.h"
  28
  29 gboolean mm_dbus_manager_register_app (MMDBusManager *manager, char *path,
  30                                        char *name, GError **error);
  31 gboolean mm_dbus_manager_get_registered_apps (MMDBusManager *manager, char ***app_paths,
  32                                               char ***app_names, GError **error);
  33
  34 #include "mm-dbus-manager-server-bindings.h"
  35
  36 #define MM_DBUS_MANAGER_GET_PRIVATE(o) \
  37   (G_TYPE_INSTANCE_GET_PRIVATE ((o), MM_TYPE_DBUS_MANAGER, MMDBusManagerDetails))
  38
  39 struct _MMDBusManagerDetails {
  40   GPtrArray       *application_names;
  41   GPtrArray       *application_paths;
  42   DBusGProxy      *bus_proxy;
  43   DBusGConnection *connection;
  44 };
  45
  46 G_DEFINE_TYPE (MMDBusManager, mm_dbus_manager, G_TYPE_OBJECT);
  47
  48 static void
  49 mm_dbus_manager_finalize (GObject *o)
  50 {
  51   MMDBusManager *m = MM_DBUS_MANAGER (o);
  52
  53   g_ptr_array_foreach (m->details->application_paths,
  54                        (GFunc) g_free,
  55                        NULL);
  56   g_ptr_array_free (m->details->application_paths, TRUE);
  57
  58   if (m->details->bus_proxy) {
  59     g_object_unref (m->details->bus_proxy);
  60   }
  61
  62   G_OBJECT_CLASS (mm_dbus_manager_parent_class)->finalize (o);
  63 }
  64
  65 static void
  66 mm_dbus_manager_class_init (MMDBusManagerClass *klass)
  67 {
  68   GObjectClass *object_class = G_OBJECT_CLASS (klass);
  69
  70   object_class->finalize = mm_dbus_manager_finalize;
  71
  72   dbus_g_object_type_install_info (MM_TYPE_DBUS_MANAGER,
  73                                    &dbus_glib_mm_dbus_manager_object_info);
  74   dbus_g_error_domain_register (MM_DBUS_ERROR_QUARK, NULL, MM_TYPE_MD_BUS_ERROR_ENUM);
  75
  76   g_type_class_add_private (klass, sizeof (MMDBusManagerDetails));
  77 }
  78
  79 static void
  80 activate_applications (MMDBusManager *manager)
  81 {
  82   GDir *dir;
  83   const char *filename;
  84   const char *dirname;
  85   GError *error = NULL;
  86
  87   dirname = "/home/anarki/mmediamanager-extensions/dbus";
  88   dir = g_dir_open (dirname, 0, &error);
  89   if (!dir) {
  90     g_warning ("Unable to open the DBus extensions directory %s: %s",
  91                dirname, error->message);
  92     g_error_free (error);
  93     return;
  94   }
  95
  96   while ((filename = g_dir_read_name (dir)) != NULL) {
  97     char *path;
  98     GKeyFile *keyfile;
  99     char *executable;
 100
 101     path = g_build_filename (dirname, filename, NULL);
 102     keyfile = g_key_file_new ();
 103     if (!g_key_file_load_from_file (keyfile, path, 0, &error)) {
 104       g_warning ("Unable to load extension descriptor %s: %s", path,
 105                  error->message);
 106       g_error_free (error);
 107       error = NULL;
 108       g_key_file_free (keyfile);
 109       g_free (path);
 110
 111       /* move on to the next file */
 112       continue;
 113     }
 114
 115     /* we are looking for the HelperPath line under the MediaManager group */
 116     executable = g_key_file_get_string (keyfile,
 117                                         "MediaManager",
 118                                         "HelperPath",
 119                                         &error);
 120     if (!executable) {
 121       g_warning ("Descriptor %s is malformed: %s", path, error->message);
 122       g_error_free (error);
 123       error = NULL;
 124       g_key_file_free (keyfile);
 125       g_free (path);
 126
 127       continue;
 128     }
 129
 130     if (!g_spawn_command_line_async (executable, &error)) {
 131       g_warning ("Unable to spawn the extension %s: %s", executable,
 132                  error->message);
 133       g_error_free (error);
 134       error = NULL;
 135     }
 136
 137     g_key_file_free (keyfile);
 138     g_free (path);
 139     g_free (executable);
 140   }
 141 }
 142
 143 static void
 144 register_on_the_bus (MMDBusManager *manager)
 145 {
 146   GError *error = NULL;
 147   MMDBusManagerDetails *details = manager->details;
 148
 149   details->connection = dbus_g_bus_get (DBUS_BUS_SESSION, &error);
 150   if (!details->connection) {
 151     g_critical ("Error getting a connection to the session bus: %s",
 152                 error->message);
 153     g_error_free (error);
 154     exit (1);
 155   }
 156
 157   details->bus_proxy = dbus_g_proxy_new_for_name (details->connection,
 158                                                   DBUS_SERVICE_DBUS,
 159                                                   DBUS_PATH_DBUS,
 160                                                   DBUS_INTERFACE_DBUS);
 161
 162   /* register the object */
 163   dbus_g_connection_register_g_object (details->connection,
 164                                        MM_DBUS_MANAGER_PATH,
 165                                        G_OBJECT (manager));
 166 }
 167
 168 static void
 169 mm_dbus_manager_init (MMDBusManager *manager)
 170 {
 171   MMDBusManagerDetails *details = manager->details = MM_DBUS_MANAGER_GET_PRIVATE (manager);
 172
 173   details->application_names = g_ptr_array_new ();
 174   details->application_paths = g_ptr_array_new ();
 175   register_on_the_bus (manager);
 176   activate_applications (manager);
 177 }
 178
 179 /* implementation of dbus methods */
 180
 181 gboolean
 182 mm_dbus_manager_register_app (MMDBusManager *manager, char *name,
 183                               char *path, GError **error)
 184 {
 185   g_return_val_if_fail (MM_IS_DBUS_MANAGER (manager), FALSE);
 186
 187   if (path == NULL) {
 188     /* set the error, the path can't be NULL */
 189     g_set_error (error, MM_DBUS_ERROR_QUARK,
 190                  MM_DBUS_ERROR_NULL_ATTRIBUTE,
 191                  "Error: can't register an app with NULL path");
 192     return FALSE;
 193   }
 194   if (name == NULL) {
 195     /* set the error, the path can't be NULL */
 196     g_set_error (error, MM_DBUS_ERROR_QUARK,
 197                  MM_DBUS_ERROR_NULL_ATTRIBUTE,
 198                  "Error: can't register an app with NULL name");
 199     return FALSE;
 200   }
 201
 202   g_ptr_array_add (manager->details->application_names,
 203                    g_strdup (name));
 204   g_ptr_array_add (manager->details->application_paths,
 205                    g_strdup (path));
 206   return TRUE;
 207 }
 208
 209 gboolean
 210 mm_dbus_manager_get_registered_apps (MMDBusManager *manager,
 211                                      char ***app_names,
 212                                      char ***app_paths,
 213                                      GError **error)
 214 {
 215   int index;
 216   int size = manager->details->application_paths->len;
 217   g_return_val_if_fail (MM_IS_DBUS_MANAGER (manager), FALSE);
 218
 219   if (app_paths == NULL || app_names == NULL) {
 220     /* set the error, the client is doing something wrong */
 221     g_set_error (error, MM_DBUS_ERROR_QUARK,
 222                  MM_DBUS_ERROR_NULL_ATTRIBUTE,
 223                  "Error: pointers passed to GetRegisteredApps can't be NULL");
 224     return FALSE;
 225   }
 226
 227   *app_paths = g_new (gchar *, size + 1);
 228   (*app_paths) [size] = NULL;
 229   *app_names = g_new (gchar *, size + 1);
 230   (*app_names) [size] = NULL;
 231
 232   for (index = 0; index < size; index++) {
 233     (*app_paths) [index] =
 234       g_strdup (g_ptr_array_index (manager->details->application_paths, index));
 235     (*app_names) [index] =
 236       g_strdup (g_ptr_array_index (manager->details->application_names, index));
 237   }
 238
 239   return TRUE;
 240 }