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
  27 #include "libmmanager/mm-error.h"
  28 #include "libmmanager/mm-type-builtins.h"
  29 #include "mm-dbus-manager.h"
  30
  31 gboolean mm_dbus_manager_register_app (MMDBusManager *manager, char *path,
  32                                        char *name, GError **error);
  33 gboolean mm_dbus_manager_get_registered_apps (MMDBusManager *manager, char ***app_paths,
  34                                               char ***app_names, GError **error);
  35
  36 #include "mm-dbus-manager-server-bindings.h"
  37
  38 #define MM_DBUS_MANAGER_GET_PRIVATE(o) \
  39   (G_TYPE_INSTANCE_GET_PRIVATE ((o), MM_TYPE_DBUS_MANAGER, MMDBusManagerDetails))
  40
  41 struct _MMDBusManagerDetails {
  42   GPtrArray       *application_names;
  43   GPtrArray       *application_paths;
  44   DBusGProxy      *bus_proxy;
  45   DBusGConnection *connection;
  46 };
  47
  48 G_DEFINE_TYPE (MMDBusManager, mm_dbus_manager, G_TYPE_OBJECT);
  49
  50 static void
  51 mm_dbus_manager_finalize (GObject *o)
  52 {
  53   MMDBusManager *m = MM_DBUS_MANAGER (o);
  54
  55   g_ptr_array_foreach (m->details->application_paths,
  56                        (GFunc) g_free,
  57                        NULL);
  58   g_ptr_array_free (m->details->application_paths, TRUE);
  59
  60   if (m->details->bus_proxy) {
  61     g_object_unref (m->details->bus_proxy);
  62   }
  63
  64   G_OBJECT_CLASS (mm_dbus_manager_parent_class)->finalize (o);
  65 }
  66
  67 static void
  68 mm_dbus_manager_class_init (MMDBusManagerClass *klass)
  69 {
  70   GObjectClass *object_class = G_OBJECT_CLASS (klass);
  71
  72   object_class->finalize = mm_dbus_manager_finalize;
  73
  74   dbus_g_object_type_install_info (MM_TYPE_DBUS_MANAGER,
  75                                    &dbus_glib_mm_dbus_manager_object_info);
  76   dbus_g_error_domain_register (MM_DBUS_ERROR_QUARK, NULL, MM_TYPE_MD_BUS_ERROR_ENUM);
  77
  78   g_type_class_add_private (klass, sizeof (MMDBusManagerDetails));
  79 }
  80
  81 static void
  82 activate_applications (MMDBusManager *manager)
  83 {
  84   GDir *dir;
  85   const char *filename;
  86   const char *dirname;
  87   GError *error = NULL;
  88
  89   dirname = MMEDIAMANAGER_EXTENSIONDIR"/dbus";
  90   dir = g_dir_open (dirname, 0, &error);
  91   if (!dir) {
  92     g_warning ("Unable to open the DBus extensions directory %s: %s",
  93                dirname, error->message);
  94     g_error_free (error);
  95     return;
  96   }
  97
  98   while ((filename = g_dir_read_name (dir)) != NULL) {
  99     char *path;
 100     GKeyFile *keyfile;
 101     char *executable;
 102
 103     path = g_build_filename (dirname, filename, NULL);
 104     keyfile = g_key_file_new ();
 105     if (!g_key_file_load_from_file (keyfile, path, 0, &error)) {
 106       g_warning ("Unable to load extension descriptor %s: %s", path,
 107                  error->message);
 108       g_error_free (error);
 109       error = NULL;
 110       g_key_file_free (keyfile);
 111       g_free (path);
 112
 113       /* move on to the next file */
 114       continue;
 115     }
 116
 117     /* we are looking for the HelperPath line under the MediaManager group */
 118     executable = g_key_file_get_string (keyfile,
 119                                         "MediaManager",
 120                                         "HelperPath",
 121                                         &error);
 122     if (!executable) {
 123       g_warning ("Descriptor %s is malformed: %s", path, error->message);
 124       g_error_free (error);
 125       error = NULL;
 126       g_key_file_free (keyfile);
 127       g_free (path);
 128
 129       continue;
 130     }
 131
 132     if (!g_spawn_command_line_async (executable, &error)) {
 133       g_warning ("Unable to spawn the extension %s: %s", executable,
 134                  error->message);
 135       g_error_free (error);
 136       error = NULL;
 137     }
 138
 139     g_key_file_free (keyfile);
 140     g_free (path);
 141     g_free (executable);
 142   }
 143 }
 144
 145 static void
 146 register_on_the_bus (MMDBusManager *manager)
 147 {
 148   GError *error = NULL;
 149   MMDBusManagerDetails *details = manager->details;
 150
 151   details->connection = dbus_g_bus_get (DBUS_BUS_SESSION, &error);
 152   if (!details->connection) {
 153     g_critical ("Error getting a connection to the session bus: %s",
 154                 error->message);
 155     g_error_free (error);
 156     exit (1);
 157   }
 158
 159   details->bus_proxy = dbus_g_proxy_new_for_name (details->connection,
 160                                                   DBUS_SERVICE_DBUS,
 161                                                   DBUS_PATH_DBUS,
 162                                                   DBUS_INTERFACE_DBUS);
 163
 164   /* register the object */
 165   dbus_g_connection_register_g_object (details->connection,
 166                                        MM_DBUS_MANAGER_PATH,
 167                                        G_OBJECT (manager));
 168 }
 169
 170 static void
 171 mm_dbus_manager_init (MMDBusManager *manager)
 172 {
 173   MMDBusManagerDetails *details = manager->details = MM_DBUS_MANAGER_GET_PRIVATE (manager);
 174
 175   details->application_names = g_ptr_array_new ();
 176   details->application_paths = g_ptr_array_new ();
 177   register_on_the_bus (manager);
 178   activate_applications (manager);
 179 }
 180
 181 /* implementation of dbus methods */
 182
 183 gboolean
 184 mm_dbus_manager_register_app (MMDBusManager *manager, char *name,
 185                               char *path, GError **error)
 186 {
 187   g_return_val_if_fail (MM_IS_DBUS_MANAGER (manager), FALSE);
 188
 189   if (path == NULL) {
 190     /* set the error, the path can't be NULL */
 191     g_set_error (error, MM_DBUS_ERROR_QUARK,
 192                  MM_DBUS_ERROR_NULL_ATTRIBUTE,
 193                  "Error: can't register an app with NULL path");
 194     return FALSE;
 195   }
 196   if (name == NULL) {
 197     /* set the error, the path can't be NULL */
 198     g_set_error (error, MM_DBUS_ERROR_QUARK,
 199                  MM_DBUS_ERROR_NULL_ATTRIBUTE,
 200                  "Error: can't register an app with NULL name");
 201     return FALSE;
 202   }
 203
 204   g_ptr_array_add (manager->details->application_names,
 205                    g_strdup (name));
 206   g_ptr_array_add (manager->details->application_paths,
 207                    g_strdup (path));
 208   return TRUE;
 209 }
 210
 211 gboolean
 212 mm_dbus_manager_get_registered_apps (MMDBusManager *manager,
 213                                      char ***app_names,
 214                                      char ***app_paths,
 215                                      GError **error)
 216 {
 217   int index;
 218   int size = manager->details->application_paths->len;
 219   g_return_val_if_fail (MM_IS_DBUS_MANAGER (manager), FALSE);
 220
 221   if (app_paths == NULL || app_names == NULL) {
 222     /* set the error, the client is doing something wrong */
 223     g_set_error (error, MM_DBUS_ERROR_QUARK,
 224                  MM_DBUS_ERROR_NULL_ATTRIBUTE,
 225                  "Error: pointers passed to GetRegisteredApps can't be NULL");
 226     return FALSE;
 227   }
 228
 229   *app_paths = g_new (gchar *, size + 1);
 230   (*app_paths) [size] = NULL;
 231   *app_names = g_new (gchar *, size + 1);
 232   (*app_names) [size] = NULL;
 233
 234   for (index = 0; index < size; index++) {
 235     (*app_paths) [index] =
 236       g_strdup (g_ptr_array_index (manager->details->application_paths, index));
 237     (*app_names) [index] =
 238       g_strdup (g_ptr_array_index (manager->details->application_names, index));
 239   }
 240
 241   return TRUE;
 242 }