shell/ev-daemon.c

   1 /* ev-metadata.c
   2  *  this file is part of evince, a gnome document viewer
   3  *
   4  * Copyright (C) 2009 Carlos Garcia Campos  <carlosgc@gnome.org>
   5  * Copyright © 2010 Christian Persch
   6  *
   7  * Evince is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * Evince is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  */
  21
  22 #include "config.h"
  23
  24 #include <glib.h>
  25 #include <glib/gstdio.h>
  26 #include <gio/gio.h>
  27 #include <string.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <sys/wait.h>
  31 #include <fcntl.h>
  32 #include <unistd.h>
  33
  34 #define EV_DBUS_DAEMON_NAME             "org.gnome.evince.Daemon"
  35 #define EV_DBUS_DAEMON_INTERFACE_NAME   "org.gnome.evince.Daemon"
  36 #define EV_DBUS_DAEMON_OBJECT_PATH      "/org/gnome/evince/Daemon"
  37
  38 #define DAEMON_TIMEOUT (30) /* seconds */
  39
  40 #define LOG g_printerr
  41
  42 static GList *ev_daemon_docs = NULL;
  43 static guint kill_timer_id;
  44
  45 typedef struct {
  46         gchar *dbus_name;
  47         gchar *uri;
  48         guint watch_id;
  49 } EvDoc;
  50
  51 static void
  52 ev_doc_free (EvDoc *doc)
  53 {
  54         if (!doc)
  55                 return;
  56
  57         g_free (doc->dbus_name);
  58         g_free (doc->uri);
  59
  60         g_bus_unwatch_name (doc->watch_id);
  61
  62         g_free (doc);
  63 }
  64
  65 static EvDoc *
  66 ev_daemon_find_doc (const gchar *uri)
  67 {
  68         GList *l;
  69
  70         for (l = ev_daemon_docs; l != NULL; l = l->next) {
  71                 EvDoc *doc = (EvDoc *)l->data;
  72
  73                 if (strcmp (doc->uri, uri) == 0)
  74                         return doc;
  75         }
  76
  77         return NULL;
  78 }
  79
  80 static void
  81 ev_daemon_stop_killtimer (void)
  82 {
  83         if (kill_timer_id != 0)
  84                 g_source_remove (kill_timer_id);
  85         kill_timer_id = 0;
  86 }
  87
  88 static gboolean
  89 ev_daemon_shutdown (gpointer user_data)
  90 {
  91         GMainLoop *loop = (GMainLoop *) user_data;
  92
  93         LOG ("Timeout; exiting daemon.\n");
  94
  95         if (g_main_loop_is_running (loop))
  96                 g_main_loop_quit (loop);
  97
  98         return FALSE;
  99 }
 100
 101 static void
 102 ev_daemon_maybe_start_killtimer (gpointer data)
 103 {
 104         ev_daemon_stop_killtimer ();
 105         if (ev_daemon_docs != NULL)
 106                 return;
 107
 108         kill_timer_id = g_timeout_add_seconds (DAEMON_TIMEOUT,
 109                                                (GSourceFunc) ev_daemon_shutdown,
 110                                                data);
 111 }
 112
 113 static gboolean
 114 convert_metadata (const gchar *metadata)
 115 {
 116         GFile   *file;
 117         char    *argv[3];
 118         gint     exit_status;
 119         GFileAttributeInfoList *namespaces;
 120         gboolean supported = FALSE;
 121         GError  *error = NULL;
 122         gboolean retval;
 123
 124         /* If metadata is not supported for a local file
 125          * is likely because and old gvfs version is running.
 126          */
 127         file = g_file_new_for_path (metadata);
 128         namespaces = g_file_query_writable_namespaces (file, NULL, NULL);
 129         if (namespaces) {
 130                 gint i;
 131
 132                 for (i = 0; i < namespaces->n_infos; i++) {
 133                         if (strcmp (namespaces->infos[i].name, "metadata") == 0) {
 134                                 supported = TRUE;
 135                                 break;
 136                         }
 137                 }
 138                 g_file_attribute_info_list_unref (namespaces);
 139         }
 140         if (!supported) {
 141                 g_warning ("GVFS metadata not supported. "
 142                            "Evince will run without metadata support.\n");
 143                 g_object_unref (file);
 144                 return FALSE;
 145         }
 146         g_object_unref (file);
 147
 148         argv[0] = g_build_filename (LIBEXECDIR, "evince-convert-metadata", NULL);
 149         argv[1] = (char *) metadata;
 150         argv[2] = NULL;
 151
 152         retval = g_spawn_sync (NULL /* wd */, argv, NULL /* env */,
 153                                0, NULL, NULL, NULL, NULL,
 154                                &exit_status, &error);
 155         g_free (argv[0]);
 156
 157         if (!retval) {
 158                 g_printerr ("Error migrating metadata: %s\n", error->message);
 159                 g_error_free (error);
 160         }
 161
 162         return retval && WIFEXITED (exit_status) && WEXITSTATUS (exit_status) == 0;
 163 }
 164
 165 static void
 166 ev_migrate_metadata (void)
 167 {
 168         gchar       *updated;
 169         gchar       *metadata;
 170         gchar       *dot_dir;
 171         const gchar *userdir;
 172
 173         userdir = g_getenv ("GNOME22_USER_DIR");
 174         if (userdir) {
 175                 dot_dir = g_build_filename (userdir, "evince", NULL);
 176         } else {
 177                 dot_dir = g_build_filename (g_get_home_dir (),
 178                                             ".gnome2",
 179                                             "evince",
 180                                             NULL);
 181         }
 182
 183         updated = g_build_filename (dot_dir, "migrated-to-gvfs", NULL);
 184         if (g_file_test (updated, G_FILE_TEST_EXISTS)) {
 185                 /* Already migrated */
 186                 g_free (updated);
 187                 g_free (dot_dir);
 188                 return;
 189         }
 190
 191         metadata = g_build_filename (dot_dir, "ev-metadata.xml", NULL);
 192         if (g_file_test (metadata, G_FILE_TEST_EXISTS)) {
 193                 if (convert_metadata (metadata)) {
 194                         gint fd;
 195
 196                         fd = g_creat (updated, 0600);
 197                         if (fd != -1) {
 198                                 close (fd);
 199                         }
 200                 }
 201         }
 202
 203         g_free (dot_dir);
 204         g_free (updated);
 205         g_free (metadata);
 206 }
 207
 208 static void
 209 name_appeared_cb (GDBusConnection *connection,
 210                   const gchar     *name,
 211                   const gchar     *name_owner,
 212                   gpointer         user_data)
 213 {
 214 }
 215
 216 static void
 217 name_vanished_cb (GDBusConnection *connection,
 218                   const gchar     *name,
 219                   gpointer         user_data)
 220 {
 221         GList *l;
 222
 223         for (l = ev_daemon_docs; l != NULL; l = l->next) {
 224                 EvDoc *doc = (EvDoc *) l->data;
 225
 226                 if (strcmp (doc->dbus_name, name) != 0)
 227                         continue;
 228
 229                 ev_daemon_docs = g_list_delete_link (ev_daemon_docs, l);
 230                 ev_doc_free (doc);
 231
 232                 ev_daemon_maybe_start_killtimer (user_data);
 233                 return;
 234         }
 235 }
 236
 237 static void
 238 method_call_cb (GDBusConnection       *connection,
 239                 const gchar           *sender,
 240                 const gchar           *object_path,
 241                 const gchar           *interface_name,
 242                 const gchar           *method_name,
 243                 GVariant              *parameters,
 244                 GDBusMethodInvocation *invocation,
 245                 gpointer               user_data)
 246 {
 247         if (g_strcmp0 (interface_name, EV_DBUS_DAEMON_INTERFACE_NAME) != 0)
 248                 return;
 249
 250         if (g_strcmp0 (method_name, "RegisterDocument") == 0) {
 251                 EvDoc       *doc;
 252                 const gchar *uri;
 253
 254                 g_variant_get (parameters, "(&s)", &uri);
 255
 256                 doc = ev_daemon_find_doc (uri);
 257                 if (doc == NULL) {
 258                         ev_daemon_stop_killtimer ();
 259
 260                         doc = g_new (EvDoc, 1);
 261                         doc->dbus_name = g_strdup (sender);
 262                         doc->uri = g_strdup (uri);
 263
 264                         doc->watch_id = g_bus_watch_name (G_BUS_TYPE_STARTER,
 265                                                           sender,
 266                                                           G_BUS_NAME_WATCHER_FLAGS_NONE,
 267                                                           name_appeared_cb,
 268                                                           name_vanished_cb,
 269                                                           user_data, NULL);
 270
 271                         LOG ("RegisterDocument registered owner '%s' for URI '%s'\n", doc->dbus_name, uri);
 272                         ev_daemon_docs = g_list_prepend (ev_daemon_docs, doc);
 273                 } else {
 274                         LOG ("RegisterDocument found owner '%s' for URI '%s'\n", doc->dbus_name, uri);
 275                 }
 276
 277                 g_dbus_method_invocation_return_value (invocation,
 278                                                        g_variant_new ("(s)", doc->dbus_name));
 279                 return;
 280
 281         } else if (g_strcmp0 (method_name, "UnregisterDocument") == 0) {
 282                 EvDoc *doc;
 283                 const gchar *uri;
 284
 285                 g_variant_get (parameters, "(&s)", &uri);
 286
 287                 LOG ("UnregisterDocument URI '%s'\n", uri);
 288
 289                 doc = ev_daemon_find_doc (uri);
 290                 if (doc == NULL) {
 291                         LOG ("UnregisterDocument URI was not registered!\n");
 292                         g_dbus_method_invocation_return_error_literal (invocation,
 293                                                                        G_DBUS_ERROR,
 294                                                                        G_DBUS_ERROR_INVALID_ARGS,
 295                                                                        "URI not registered");
 296                         return;
 297                 }
 298
 299                 if (strcmp (doc->dbus_name, sender) != 0) {
 300                         LOG ("UnregisterDocument called by non-owner (owner '%s' sender '%s')\n",
 301                              doc->dbus_name, sender);
 302
 303                         g_dbus_method_invocation_return_error_literal (invocation,
 304                                                                        G_DBUS_ERROR,
 305                                                                        G_DBUS_ERROR_BAD_ADDRESS,
 306                                                                        "Only owner can call this method");
 307                         return;
 308                 }
 309
 310                 ev_daemon_docs = g_list_remove (ev_daemon_docs, doc);
 311                 ev_doc_free (doc);
 312                 ev_daemon_maybe_start_killtimer (user_data);
 313
 314                 g_dbus_method_invocation_return_value (invocation, g_variant_new ("()"));
 315                 return;
 316         }
 317 }
 318
 319 static void
 320 name_acquired_cb (GDBusConnection *connection,
 321                   const gchar     *name,
 322                   gpointer         user_data)
 323 {
 324         ev_migrate_metadata ();
 325
 326         ev_daemon_maybe_start_killtimer (user_data);
 327 }
 328
 329 static void
 330 name_lost_cb (GDBusConnection *connection,
 331               const gchar     *name,
 332               gpointer         user_data)
 333 {
 334           GMainLoop *loop = (GMainLoop *) user_data;
 335
 336           /* Failed to acquire the name; exit daemon */
 337           if (g_main_loop_is_running (loop))
 338                   g_main_loop_quit (loop);
 339 }
 340
 341 static const char introspection_xml[] =
 342   "<node>"
 343     "<interface name='org.gnome.evince.Daemon'>"
 344       "<method name='RegisterDocument'>"
 345         "<arg type='s' name='uri' direction='in'/>"
 346         "<arg type='s' name='owner' direction='out'/>"
 347       "</method>"
 348       "<method name='UnregisterDocument'>"
 349         "<arg type='s' name='uri' direction='in'/>"
 350       "</method>"
 351     "</interface>"
 352   "</node>";
 353
 354 static const GDBusInterfaceVTable interface_vtable = {
 355   method_call_cb,
 356   NULL,
 357   NULL
 358 };
 359
 360 gint
 361 main (gint argc, gchar **argv)
 362 {
 363         GDBusConnection *connection;
 364         GMainLoop *loop;
 365         GError *error = NULL;
 366         guint registration_id, owner_id;
 367         GDBusNodeInfo *introspection_data;
 368
 369         g_set_prgname ("evince-daemon");
 370
 371         g_type_init ();
 372
 373         connection = g_bus_get_sync (G_BUS_TYPE_STARTER, NULL, &error);
 374         if (connection == NULL) {
 375                 g_printerr ("Failed to get bus connection: %s\n", error->message);
 376                 g_error_free (error);
 377                 return 1;
 378         }
 379
 380         introspection_data = g_dbus_node_info_new_for_xml (introspection_xml, NULL);
 381         g_assert (introspection_data != NULL);
 382
 383         loop = g_main_loop_new (NULL, FALSE);
 384
 385         registration_id = g_dbus_connection_register_object (connection,
 386                                                              EV_DBUS_DAEMON_OBJECT_PATH,
 387                                                              EV_DBUS_DAEMON_NAME,
 388                                                              introspection_data->interfaces[0],
 389                                                              &interface_vtable,
 390                                                              g_main_loop_ref (loop),
 391                                                              (GDestroyNotify) g_main_loop_unref,
 392                                                              &error);
 393         if (registration_id == 0) {
 394                 g_printerr ("Failed to register object: %s\n", error->message);
 395                 g_error_free (error);
 396                 g_object_unref (connection);
 397                 return 1;
 398         }
 399
 400         owner_id = g_bus_own_name_on_connection (connection,
 401                                                  EV_DBUS_DAEMON_NAME,
 402                                                  G_BUS_NAME_OWNER_FLAGS_NONE,
 403                                                  name_acquired_cb,
 404                                                  name_lost_cb,
 405                                                  g_main_loop_ref (loop),
 406                                                  (GDestroyNotify) g_main_loop_unref);
 407
 408         g_main_loop_run (loop);
 409
 410         g_bus_unown_name (owner_id);
 411
 412         g_main_loop_unref (loop);
 413         g_dbus_node_info_unref (introspection_data);
 414         g_list_foreach (ev_daemon_docs, (GFunc)ev_doc_free, NULL);
 415         g_list_free (ev_daemon_docs);
 416         g_object_unref (connection);
 417
 418         return 0;
 419 }