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