File: gtksearchenginetracker.c

package info (click to toggle)
gtk+2.0 2.24.32-3
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 128,080 kB
  • sloc: ansic: 574,621; makefile: 5,197; sh: 4,500; xml: 1,193; python: 1,119; perl: 749; awk: 72; cpp: 34
file content (488 lines) | stat: -rw-r--r-- 13,196 bytes parent folder | download | duplicates (6)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
/*
 * Copyright (C) 2009-2011 Nokia <ivan.frade@nokia.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 *
 * Authors: Jürg Billeter <juerg.billeter@codethink.co.uk>
 *          Martyn Russell <martyn@lanedo.com>
 *
 * Based on nautilus-search-engine-tracker.c
 */

#include "config.h"

#include <string.h>

#include <gio/gio.h>
#include <gmodule.h>
#include <gdk/gdk.h>
#include <gtk/gtk.h>

#include "gtksearchenginetracker.h"

#define DBUS_SERVICE_RESOURCES   "org.freedesktop.Tracker1"
#define DBUS_PATH_RESOURCES      "/org/freedesktop/Tracker1/Resources"
#define DBUS_INTERFACE_RESOURCES "org.freedesktop.Tracker1.Resources"

#define DBUS_SERVICE_STATUS      "org.freedesktop.Tracker1"
#define DBUS_PATH_STATUS         "/org/freedesktop/Tracker1/Status"
#define DBUS_INTERFACE_STATUS    "org.freedesktop.Tracker1.Status"

/* Time in second to wait for service before deciding it's not available */
#define WAIT_TIMEOUT_SECONDS 1

/* Time in second to wait for query results to come back */
#define QUERY_TIMEOUT_SECONDS 10

/* If defined, we use fts:match, this has to be enabled in Tracker to
 * work which it usually is. The alternative is to undefine it and
 * use filename matching instead. This doesn't use the content of the
 * file however.
 */
#define FTS_MATCHING

/*
 * GtkSearchEngineTracker object
 */
struct _GtkSearchEngineTrackerPrivate
{
  GDBusConnection *connection;
  GCancellable *cancellable;
  GtkQuery *query;
  gboolean query_pending;
};

G_DEFINE_TYPE (GtkSearchEngineTracker, _gtk_search_engine_tracker, GTK_TYPE_SEARCH_ENGINE);

static void
finalize (GObject *object)
{
  GtkSearchEngineTracker *tracker;

  g_debug ("Finalizing GtkSearchEngineTracker");

  tracker = GTK_SEARCH_ENGINE_TRACKER (object);

  if (tracker->priv->cancellable)
    {
      g_cancellable_cancel (tracker->priv->cancellable);
      g_object_unref (tracker->priv->cancellable);
      tracker->priv->cancellable = NULL;
    }

  if (tracker->priv->query)
    {
      g_object_unref (tracker->priv->query);
      tracker->priv->query = NULL;
    }

  if (tracker->priv->connection)
    {
      g_object_unref (tracker->priv->connection);
      tracker->priv->connection = NULL;
    }

  G_OBJECT_CLASS (_gtk_search_engine_tracker_parent_class)->finalize (object);
}

static GDBusConnection *
get_connection (void)
{
  GDBusConnection *connection;
  GError *error = NULL;
  GVariant *reply;

  /* Normally I hate sync calls with UIs, but we need to return NULL
   * or a GtkSearchEngine as a result of this function.
   */
  connection = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, &error);

  if (error)
    {
      g_debug ("Couldn't connect to D-Bus session bus, %s", error->message);
      g_error_free (error);
      return NULL;
    }

  /* If connection is set, we know it worked. */
  g_debug ("Finding out if Tracker is available via D-Bus...");

  /* We only wait 1 second max, we expect it to be very fast. If we
   * don't get a response by then, clearly we're replaying a journal
   * or cleaning up the DB internally. Either way, services is not
   * available.
   *
   * We use the sync call here because we don't expect to be waiting
   * long enough to block UI painting.
   */
  reply = g_dbus_connection_call_sync (connection,
                                       DBUS_SERVICE_STATUS,
                                       DBUS_PATH_STATUS,
                                       DBUS_INTERFACE_STATUS,
                                       "Wait",
                                       NULL,
                                       NULL,
                                       G_DBUS_CALL_FLAGS_NONE,
                                       WAIT_TIMEOUT_SECONDS * 1000,
                                       NULL,
                                       &error);

  if (error)
    {
      g_debug ("Tracker is not available, %s", error->message);
      g_error_free (error);
      g_object_unref (connection);
      return NULL;
    }

  g_variant_unref (reply);

  g_debug ("Tracker is ready");

  return connection;
}

static void
get_query_results (GtkSearchEngineTracker *engine,
                   const gchar            *sparql,
                   GAsyncReadyCallback     callback,
                   gpointer                user_data)
{
  g_dbus_connection_call (engine->priv->connection,
                          DBUS_SERVICE_RESOURCES,
                          DBUS_PATH_RESOURCES,
                          DBUS_INTERFACE_RESOURCES,
                          "SparqlQuery",
                          g_variant_new ("(s)", sparql),
                          NULL,
                          G_DBUS_CALL_FLAGS_NONE,
                          QUERY_TIMEOUT_SECONDS * 1000,
                          engine->priv->cancellable,
                          callback,
                          user_data);
}

/* Stolen from libtracker-common */
static GList *
string_list_to_gslist (gchar **strv)
{
  GList *list;
  gsize i;

  list = NULL;

  for (i = 0; strv[i]; i++)
    list = g_list_prepend (list, g_strdup (strv[i]));

  return g_list_reverse (list);
}

/* Stolen from libtracker-sparql */
static gchar *
sparql_escape_string (const gchar *literal)
{
  GString *str;
  const gchar *p;

  g_return_val_if_fail (literal != NULL, NULL);

  str = g_string_new ("");
  p = literal;

  while (TRUE)
     {
      gsize len;

      if (!((*p) != '\0'))
        break;

      len = strcspn ((const gchar *) p, "\t\n\r\b\f\"\\");
      g_string_append_len (str, (const gchar *) p, (gssize) ((glong) len));
      p = p + len;

      switch (*p)
        {
        case '\t':
          g_string_append (str, "\\t");
          break;
        case '\n':
          g_string_append (str, "\\n");
          break;
        case '\r':
          g_string_append (str, "\\r");
          break;
        case '\b':
          g_string_append (str, "\\b");
          break;
        case '\f':
          g_string_append (str, "\\f");
          break;
        case '"':
          g_string_append (str, "\\\"");
          break;
        case '\\':
          g_string_append (str, "\\\\");
          break;
        default:
          continue;
        }

      p++;
     }
  return g_string_free (str, FALSE);
 }

static void
sparql_append_string_literal (GString     *sparql,
                              const gchar *str)
{
  gchar *s;

  s = sparql_escape_string (str);

  g_string_append_c (sparql, '"');
  g_string_append (sparql, s);
  g_string_append_c (sparql, '"');

  g_free (s);
}

static void
sparql_append_string_literal_lower_case (GString     *sparql,
                                         const gchar *str)
{
  gchar *s;

  s = g_utf8_strdown (str, -1);
  sparql_append_string_literal (sparql, s);
  g_free (s);
}

static void
query_callback (GObject      *object,
                GAsyncResult *res,
                gpointer      user_data)
{
  GtkSearchEngineTracker *tracker;
  GList *hits;
  GVariant *reply;
  GVariant *r;
  GVariantIter iter;
  gchar **result;
  GError *error = NULL;
  gint i, n;

  gdk_threads_enter ();

  tracker = GTK_SEARCH_ENGINE_TRACKER (user_data);

  tracker->priv->query_pending = FALSE;

  reply = g_dbus_connection_call_finish (tracker->priv->connection, res, &error);
  if (error)
    {
      _gtk_search_engine_error (GTK_SEARCH_ENGINE (tracker), error->message);
      g_error_free (error);
      gdk_threads_leave ();
      return;
    }

  if (!reply)
    {
      _gtk_search_engine_finished (GTK_SEARCH_ENGINE (tracker));
      gdk_threads_leave ();
      return;
    }

  r = g_variant_get_child_value (reply, 0);
  g_variant_iter_init (&iter, r);
  n = g_variant_iter_n_children (&iter);
  result = g_new0 (gchar *, n + 1);
  for (i = 0; i < n; i++)
    {
      GVariant *v;
      const gchar **strv;

      v = g_variant_iter_next_value (&iter);
      strv = g_variant_get_strv (v, NULL);
      result[i] = (gchar*)strv[0];
      g_free (strv);
    }

  /* We iterate result by result, not n at a time. */
  hits = string_list_to_gslist (result);
  _gtk_search_engine_hits_added (GTK_SEARCH_ENGINE (tracker), hits);
  _gtk_search_engine_finished (GTK_SEARCH_ENGINE (tracker));
  g_list_free (hits);
  g_free (result);
  g_variant_unref (reply);
  g_variant_unref (r);

  gdk_threads_leave ();
}

static void
gtk_search_engine_tracker_start (GtkSearchEngine *engine)
{
  GtkSearchEngineTracker *tracker;
  gchar *search_text;
#ifdef FTS_MATCHING
  gchar *location_uri;
#endif
  GString *sparql;

  tracker = GTK_SEARCH_ENGINE_TRACKER (engine);

  if (tracker->priv->query_pending)
    {
      g_debug ("Attempt to start a new search while one is pending, doing nothing");
      return;
    }

  if (tracker->priv->query == NULL)
    {
      g_debug ("Attempt to start a new search with no GtkQuery, doing nothing");
      return;
    }

  search_text = _gtk_query_get_text (tracker->priv->query);

#ifdef FTS_MATCHING
  location_uri = _gtk_query_get_location (tracker->priv->query);
  /* Using FTS: */
  sparql = g_string_new ("SELECT nie:url(?urn) "
                         "WHERE {"
                         "  ?urn a nfo:FileDataObject ;"
                         "  tracker:available true ; "
                         "  fts:match ");
  sparql_append_string_literal (sparql, search_text);

  if (location_uri)
    {
      g_string_append (sparql, " . FILTER (fn:starts-with(nie:url(?urn),");
      sparql_append_string_literal (sparql, location_uri);
      g_string_append (sparql, "))");
    }

  g_string_append (sparql, " } ORDER BY DESC(fts:rank(?urn)) ASC(nie:url(?urn))");
#else  /* FTS_MATCHING */
  /* Using filename matching: */
  sparql = g_string_new ("SELECT nie:url(?urn) "
                         "WHERE {"
                         "  ?urn a nfo:FileDataObject ;"
                         "    tracker:available true ."
                         "  FILTER (fn:contains(fn:lower-case(nfo:fileName(?urn)),");
  sparql_append_string_literal_lower_case (sparql, search_text);

  g_string_append (sparql,
                   "))"
                   "} ORDER BY DESC(nie:url(?urn)) DESC(nfo:fileName(?urn))");
#endif /* FTS_MATCHING */

  tracker->priv->query_pending = TRUE;

  get_query_results (tracker, sparql->str, query_callback, tracker);

  g_string_free (sparql, TRUE);
  g_free (search_text);
}

static void
gtk_search_engine_tracker_stop (GtkSearchEngine *engine)
{
  GtkSearchEngineTracker *tracker;

  tracker = GTK_SEARCH_ENGINE_TRACKER (engine);

  if (tracker->priv->query && tracker->priv->query_pending)
    {
      g_cancellable_cancel (tracker->priv->cancellable);
      tracker->priv->query_pending = FALSE;
    }
}

static gboolean
gtk_search_engine_tracker_is_indexed (GtkSearchEngine *engine)
{
  return TRUE;
}

static void
gtk_search_engine_tracker_set_query (GtkSearchEngine *engine,
                                     GtkQuery        *query)
{
  GtkSearchEngineTracker *tracker;

  tracker = GTK_SEARCH_ENGINE_TRACKER (engine);

  if (query)
    g_object_ref (query);

  if (tracker->priv->query)
    g_object_unref (tracker->priv->query);

  tracker->priv->query = query;
}

static void
_gtk_search_engine_tracker_class_init (GtkSearchEngineTrackerClass *class)
{
  GObjectClass *gobject_class;
  GtkSearchEngineClass *engine_class;

  gobject_class = G_OBJECT_CLASS (class);
  gobject_class->finalize = finalize;

  engine_class = GTK_SEARCH_ENGINE_CLASS (class);
  engine_class->set_query = gtk_search_engine_tracker_set_query;
  engine_class->start = gtk_search_engine_tracker_start;
  engine_class->stop = gtk_search_engine_tracker_stop;
  engine_class->is_indexed = gtk_search_engine_tracker_is_indexed;

  g_type_class_add_private (gobject_class,
                            sizeof (GtkSearchEngineTrackerPrivate));
}

static void
_gtk_search_engine_tracker_init (GtkSearchEngineTracker *engine)
{
  engine->priv = G_TYPE_INSTANCE_GET_PRIVATE (engine,
                                              GTK_TYPE_SEARCH_ENGINE_TRACKER,
                                              GtkSearchEngineTrackerPrivate);
}


GtkSearchEngine *
_gtk_search_engine_tracker_new (void)
{
  GtkSearchEngineTracker *engine;
  GDBusConnection *connection;

  g_debug ("--");

  connection = get_connection ();
  if (!connection)
    return NULL;

  g_debug ("Creating GtkSearchEngineTracker...");

  engine = g_object_new (GTK_TYPE_SEARCH_ENGINE_TRACKER, NULL);

  engine->priv->connection = connection;
  engine->priv->cancellable = g_cancellable_new ();
  engine->priv->query_pending = FALSE;

  return GTK_SEARCH_ENGINE (engine);
}