libtracker-data: Drop FTS table/view before ontology updateswip/carlosg/issue-40

Sqlite >= 3.25.0 got stricter 'alter table ... rename ...' behavior
where the renaming affects all references to the table across the
database. This is at odds with our fts_view view on schema updates
due to ontology changes, as we first migrate (rename current table,
create new one, insert previous content, drop old table) all resource
tables before doing the FTS table/view updates. This causes rename
failures due to the fts_view referencing the renamed and dropped
tables.

Change the ontology update code so we delete the FTS table/view
before changing resource tables in case of FTS updates. This makes
the behavior correct both before and after the Sqlite change.

https://gitlab.gnome.org/GNOME/tracker/issues/40

5 files changed, 107 insertions, 42 deletions

diff --git a/src/libtracker-data/tracker-data-manager.c b/src/libtracker-data/tracker-data-manager.c
index 4fab66824..87c9b486f 100644
--- a/src/libtracker-data/tracker-data-manager.c
+++ b/src/libtracker-data/tracker-data-manager.c
@@ -135,6 +135,12 @@ enum {
 	N_PROPS
 };
 
+#if HAVE_TRACKER_FTS
+static gboolean tracker_data_manager_fts_changed (TrackerDataManager *manager);
+static void tracker_data_manager_update_fts (TrackerDataManager *manager,
+                                             TrackerDBInterface *iface);
+#endif
+
 static void tracker_data_manager_initable_iface_init (GInitableIface *iface);
 
 G_DEFINE_TYPE_WITH_CODE (TrackerDataManager, tracker_data_manager, G_TYPE_OBJECT,
@@ -3681,6 +3687,9 @@ tracker_data_ontology_import_into_db (TrackerDataManager  *manager,
 	TrackerProperty **properties;
 	guint i, n_props, n_classes;
 	gboolean base_tables_altered = FALSE;
+#if HAVE_TRACKER_FTS
+	gboolean update_fts = FALSE;
+#endif
 
 	iface = tracker_db_manager_get_writable_db_interface (manager->db_manager);
 
@@ -3691,6 +3700,15 @@ tracker_data_ontology_import_into_db (TrackerDataManager  *manager,
 		return;
 	}
 
+#if HAVE_TRACKER_FTS
+	if (in_update) {
+		update_fts = tracker_data_manager_fts_changed (manager);
+
+		if (update_fts)
+			tracker_db_interface_sqlite_fts_delete_table (iface);
+	}
+#endif
+
 	/* create tables */
 	for (i = 0; i < n_classes; i++) {
 		GError *internal_error = NULL;
@@ -3740,6 +3758,14 @@ tracker_data_ontology_import_into_db (TrackerDataManager  *manager,
 			}
 		}
 	}
+
+#if HAVE_TRACKER_FTS
+	if (update_fts) {
+		tracker_data_manager_update_fts (manager, iface);
+	} else {
+		tracker_data_manager_init_fts (iface, !in_update);
+	}
+#endif
 }
 
 static gint
@@ -3942,13 +3968,44 @@ load_ontologies_gvdb (TrackerDataManager  *manager,
 
 #if HAVE_TRACKER_FTS
 static gboolean
+tracker_data_manager_fts_changed (TrackerDataManager *manager)
+{
+	TrackerProperty **properties;
+	gboolean has_changed = FALSE;
+	guint i, len;
+
+	properties = tracker_ontologies_get_properties (manager->ontologies, &len);
+
+	for (i = 0; i < len; i++) {
+		TrackerClass *class;
+
+		if (tracker_property_get_fulltext_indexed (properties[i]) !=
+		    tracker_property_get_orig_fulltext_indexed (properties[i])) {
+			has_changed |= TRUE;
+		}
+
+		if (!tracker_property_get_fulltext_indexed (properties[i])) {
+			continue;
+		}
+
+		has_changed |= tracker_property_get_is_new (properties[i]);
+
+		/* We must also regenerate FTS if any table in the view
+		 * updated its schema.
+		 */
+		class = tracker_property_get_domain (properties[i]);
+		has_changed |= tracker_class_get_db_schema_changed (class);
+	}
+
+	return has_changed;
+}
+
+static void
 ontology_get_fts_properties (TrackerDataManager  *manager,
-                             gboolean             only_new,
                              GHashTable         **fts_properties,
                              GHashTable         **multivalued)
 {
 	TrackerProperty **properties;
-	gboolean has_changed = FALSE;
 	guint i, len;
 
 	properties = tracker_ontologies_get_properties (manager->ontologies, &len);
@@ -3960,16 +4017,10 @@ ontology_get_fts_properties (TrackerDataManager  *manager,
 		const gchar *name, *table_name;
 		GList *list;
 
-		if (tracker_property_get_fulltext_indexed (properties[i]) !=
-		    tracker_property_get_orig_fulltext_indexed (properties[i])) {
-			has_changed |= TRUE;
-		}
-
 		if (!tracker_property_get_fulltext_indexed (properties[i])) {
 			continue;
 		}
 
-		has_changed |= tracker_property_get_is_new (properties[i]);
 		table_name = tracker_property_get_table_name (properties[i]);
 		name = tracker_property_get_name (properties[i]);
 		list = g_hash_table_lookup (*fts_properties, table_name);
@@ -3986,8 +4037,6 @@ ontology_get_fts_properties (TrackerDataManager  *manager,
 			list = g_list_append (list, (gpointer) name);
 		}
 	}
-
-	return has_changed;
 }
 
 static void
@@ -4001,29 +4050,36 @@ rebuild_fts_tokens (TrackerDataManager *manager,
 	/* Update the stamp file */
 	tracker_db_manager_tokenizer_update (manager->db_manager);
 }
-#endif
 
 gboolean
 tracker_data_manager_init_fts (TrackerDBInterface *iface,
                                gboolean            create)
 {
-#if HAVE_TRACKER_FTS
 	GHashTable *fts_props, *multivalued;
 	TrackerDataManager *manager;
 
 	manager = tracker_db_interface_get_user_data (iface);
-	ontology_get_fts_properties (manager, FALSE, &fts_props, &multivalued);
+	ontology_get_fts_properties (manager, &fts_props, &multivalued);
 	tracker_db_interface_sqlite_fts_init (iface, fts_props,
 	                                      multivalued, create);
 	g_hash_table_unref (fts_props);
 	g_hash_table_unref (multivalued);
 	return TRUE;
-#else
-	g_info ("FTS support is disabled");
-	return FALSE;
-#endif
 }
 
+static void
+tracker_data_manager_update_fts (TrackerDataManager *manager,
+                                 TrackerDBInterface *iface)
+{
+	GHashTable *fts_properties, *multivalued;
+
+	ontology_get_fts_properties (manager, &fts_properties, &multivalued);
+	tracker_db_interface_sqlite_fts_alter_table (iface, fts_properties, multivalued);
+	g_hash_table_unref (fts_properties);
+	g_hash_table_unref (multivalued);
+}
+#endif
+
 GFile *
 tracker_data_manager_get_cache_location (TrackerDataManager *manager)
 {
@@ -4279,8 +4335,6 @@ tracker_data_manager_initable_init (GInitable     *initable,
 		tracker_data_ontology_import_into_db (manager, FALSE,
 		                                      &internal_error);
 
-		tracker_data_manager_init_fts (iface, TRUE);
-
 		if (internal_error) {
 			g_propagate_error (error, internal_error);
 			return FALSE;
@@ -4371,7 +4425,9 @@ tracker_data_manager_initable_init (GInitable     *initable,
 			}
 		}
 
+#if HAVE_TRACKER_FTS
 		tracker_data_manager_init_fts (iface, FALSE);
+#endif
 	}
 
 	if (!read_only) {
@@ -4630,17 +4686,6 @@ tracker_data_manager_initable_init (GInitable     *initable,
 			}
 
 			if (update_nao) {
-#if HAVE_TRACKER_FTS
-				GHashTable *fts_properties, *multivalued;
-
-				if (ontology_get_fts_properties (manager, TRUE, &fts_properties, &multivalued)) {
-					tracker_db_interface_sqlite_fts_alter_table (iface, fts_properties, multivalued);
-				}
-
-				g_hash_table_unref (fts_properties);
-				g_hash_table_unref (multivalued);
-#endif
-
 				update_ontology_last_modified (manager, iface, ontology, &n_error);
 
 				if (n_error) {
diff --git a/src/libtracker-data/tracker-db-interface-sqlite.c b/src/libtracker-data/tracker-db-interface-sqlite.c
index dbecce9e5..9a8a5c302 100644
--- a/src/libtracker-data/tracker-db-interface-sqlite.c
+++ b/src/libtracker-data/tracker-db-interface-sqlite.c
@@ -1657,6 +1657,14 @@ tracker_db_interface_sqlite_fts_init (TrackerDBInterface  *db_interface,
 #if HAVE_TRACKER_FTS
 
 void
+tracker_db_interface_sqlite_fts_delete_table (TrackerDBInterface  *db_interface)
+{
+	if (!tracker_fts_delete_table (db_interface->db, "fts5")) {
+		g_critical ("Failed to delete FTS table");
+	}
+}
+
+void
 tracker_db_interface_sqlite_fts_alter_table (TrackerDBInterface  *db_interface,
 					     GHashTable          *properties,
 					     GHashTable          *multivalued)
diff --git a/src/libtracker-data/tracker-db-interface-sqlite.h b/src/libtracker-data/tracker-db-interface-sqlite.h
index 8ae70fd42..45eb5fd7c 100644
--- a/src/libtracker-data/tracker-db-interface-sqlite.h
+++ b/src/libtracker-data/tracker-db-interface-sqlite.h
@@ -61,6 +61,8 @@ gboolean            tracker_db_interface_sqlite_wal_checkpoint         (TrackerD
 
 
 #if HAVE_TRACKER_FTS
+void                tracker_db_interface_sqlite_fts_delete_table       (TrackerDBInterface       *interface);
+
 void                tracker_db_interface_sqlite_fts_alter_table        (TrackerDBInterface       *interface,
                                                                         GHashTable               *properties,
                                                                         GHashTable               *multivalued);
diff --git a/src/libtracker-fts/tracker-fts.c b/src/libtracker-fts/tracker-fts.c
index 3c550ca41..49ba4d362 100644
--- a/src/libtracker-fts/tracker-fts.c
+++ b/src/libtracker-fts/tracker-fts.c
@@ -158,6 +158,26 @@ tracker_fts_create_table (sqlite3    *db,
 }
 
 gboolean
+tracker_fts_delete_table (sqlite3 *db,
+                          gchar   *table_name)
+{
+	gchar *query;
+	int rc;
+
+	query = g_strdup_printf ("DROP VIEW fts_view");
+	rc = sqlite3_exec (db, query, NULL, NULL, NULL);
+	g_free (query);
+
+	if (rc == SQLITE_OK) {
+		query = g_strdup_printf ("DROP TABLE %s", table_name);
+		sqlite3_exec (db, query, NULL, NULL, NULL);
+		g_free (query);
+	}
+
+	return rc == SQLITE_OK;
+}
+
+gboolean
 tracker_fts_alter_table (sqlite3    *db,
 			 gchar      *table_name,
 			 GHashTable *tables,
@@ -168,18 +188,6 @@ tracker_fts_alter_table (sqlite3    *db,
 
 	tmp_name = g_strdup_printf ("%s_TMP", table_name);
 
-	query = g_strdup_printf ("DROP VIEW fts_view");
-	rc = sqlite3_exec (db, query, NULL, NULL, NULL);
-	g_free (query);
-
-	query = g_strdup_printf ("DROP TABLE %s", tmp_name);
-	rc = sqlite3_exec (db, query, NULL, NULL, NULL);
-	g_free (query);
-
-	query = g_strdup_printf ("DROP TABLE %s", table_name);
-	rc = sqlite3_exec (db, query, NULL, NULL, NULL);
-	g_free (query);
-
 	if (!tracker_fts_create_table (db, tmp_name, tables, grouped_columns)) {
 		g_free (tmp_name);
 		return FALSE;
diff --git a/src/libtracker-fts/tracker-fts.h b/src/libtracker-fts/tracker-fts.h
index 751014f38..3bda8cf98 100644
--- a/src/libtracker-fts/tracker-fts.h
+++ b/src/libtracker-fts/tracker-fts.h
@@ -36,6 +36,8 @@ gboolean    tracker_fts_create_table     (sqlite3    *db,
                                           gchar      *table_name,
                                           GHashTable *tables,
                                           GHashTable *grouped_columns);
+gboolean    tracker_fts_delete_table     (sqlite3    *db,
+                                          gchar      *table_name);
 gboolean    tracker_fts_alter_table      (sqlite3    *db,
                                           gchar      *table_name,
                                           GHashTable *tables,