[gtk+/tracker-with-libtracker-sparql] WIP
- From: Martyn James Russell <mr src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk+/tracker-with-libtracker-sparql] WIP
- Date: Tue, 7 Dec 2010 12:15:01 +0000 (UTC)
commit 82d851514667540d754a31f6e832f8ba2362878d
Author: Martyn Russell <martyn lanedo com>
Date: Mon Dec 6 17:50:10 2010 +0000
WIP
gtk/gtksearchenginetracker.c | 545 ++++++++++++++++++++----------------------
1 files changed, 259 insertions(+), 286 deletions(-)
---
diff --git a/gtk/gtksearchenginetracker.c b/gtk/gtksearchenginetracker.c
index e46691a..ea26645 100644
--- a/gtk/gtksearchenginetracker.c
+++ b/gtk/gtksearchenginetracker.c
@@ -1,5 +1,4 @@
/*
- * Copyright (C) 2005 Jamie McCracken <jamiemcc gnome org>
* Copyright (C) 2009-2010 Nokia <ivan frade nokia com>
*
* This library is free software; you can redistribute it and/or
@@ -16,163 +15,138 @@
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
*
- * Authors: Jamie McCracken <jamiemcc gnome org>
- * Jürg Billeter <juerg billeter codethink co uk>
+ * Authors: Jürg Billeter <juerg billeter codethink co uk>
* Martyn Russell <martyn lanedo com>
*
* Based on nautilus-search-engine-tracker.c
*/
#include "config.h"
-#include <gmodule.h>
-#include "gtksearchenginetracker.h"
-/* we dlopen() libtracker at runtime */
+#include <gio/gio.h>
+#include <gmodule.h>
-typedef struct _TrackerClient TrackerClient;
+#include "gtksearchenginetracker.h"
-typedef enum
-{
- TRACKER_UNAVAILABLE = 0,
- TRACKER_0_6 = 1 << 0,
- TRACKER_0_7 = 1 << 1,
- TRACKER_0_8 = 1 << 2,
- TRACKER_0_9 = 1 << 3
-} TrackerVersion;
-
-
-/* Tracker 0.6 API */
-typedef void (*TrackerArrayReply) (char **result,
- GError *error,
- gpointer user_data);
-
-static TrackerClient *
- (*tracker_connect) (gboolean enable_warnings,
- gint timeout) = NULL;
-static void (*tracker_disconnect) (TrackerClient *client) = NULL;
-static int (*tracker_get_version) (TrackerClient *client,
- GError **error) = NULL;
-static void (*tracker_cancel_last_call) (TrackerClient *client) = NULL;
-
-static void (*tracker_search_metadata_by_text_async) (TrackerClient *client,
- const char *query,
- TrackerArrayReply callback,
- gpointer user_data) = NULL;
-static void (*tracker_search_metadata_by_text_and_location_async) (TrackerClient *client,
- const char *query,
- const char *location,
- TrackerArrayReply callback,
- gpointer user_data) = NULL;
-
-
-/* Tracker 0.7->0.9 API */
-typedef enum {
- TRACKER_CLIENT_ENABLE_WARNINGS = 1 << 0
-} TrackerClientFlags;
-
-typedef void (*TrackerReplyGPtrArray) (GPtrArray *result,
- GError *error,
- gpointer user_data);
-
-static TrackerClient * (*tracker_client_new) (TrackerClientFlags flags,
- gint timeout) = NULL;
-static gchar * (*tracker_sparql_escape) (const gchar *str) = NULL;
-static guint (*tracker_resources_sparql_query_async) (TrackerClient *client,
- const gchar *query,
- TrackerReplyGPtrArray callback,
- gpointer user_data) = NULL;
-
-
-static struct TrackerDlMapping
-{
- const char *fn_name;
- gpointer *fn_ptr_ref;
- TrackerVersion versions;
-} tracker_dl_mapping[] =
+/* we dlopen() libtracker-sparql at runtime */
+
+#define MODULE_FILENAME "libtracker-sparql-0.10.so.0"
+
+#define MODULE_MAP(a) { #a, (gpointer *)&a }
+
+/* Connection object */
+typedef struct _TrackerSparqlConnection TrackerSparqlConnection;
+
+#define TRACKER_SPARQL_TYPE_CONNECTION (tracker_sparql_connection_get_type ())
+#define TRACKER_SPARQL_CONNECTION(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), TRACKER_SPARQL_TYPE_CONNECTION, TrackerSparqlConnection))
+
+/* Cursor object */
+typedef struct _TrackerSparqlCursor TrackerSparqlCursor;
+
+#define TRACKER_SPARQL_TYPE_CURSOR (tracker_sparql_cursor_get_type ())
+#define TRACKER_SPARQL_CURSOR(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), TRACKER_SPARQL_TYPE_CURSOR, TrackerSparqlCursor))
+
+/* API */
+static GType (*tracker_sparql_connection_get_type) (void) = NULL;
+static TrackerSparqlConnection * (*tracker_sparql_connection_get) (GCancellable *cancellable,
+ GError **error) = NULL;
+static void (*tracker_sparql_connection_query_async) (TrackerSparqlConnection *self,
+ const gchar *sparql,
+ GCancellable *cancellable,
+ GAsyncReadyCallback callback,
+ gpointer user_data) = NULL;
+static TrackerSparqlCursor * (*tracker_sparql_connection_query_finish) (TrackerSparqlConnection *self,
+ GAsyncResult *_res_,
+ GError **error) = NULL;
+static GType (*tracker_sparql_cursor_get_type) (void) = NULL;
+static void (*tracker_sparql_cursor_next_async) (TrackerSparqlCursor *self,
+ GCancellable *cancellable,
+ GAsyncReadyCallback callback,
+ gpointer user_data) = NULL;
+static gboolean (*tracker_sparql_cursor_next_finish) (TrackerSparqlCursor *self,
+ GAsyncResult *_res_,
+ GError **error) = NULL;
+static const gchar * (*tracker_sparql_cursor_get_string) (TrackerSparqlCursor *self,
+ gint *column,
+ glong *length) = NULL;
+static gchar * (*tracker_sparql_escape_string) (const gchar *literal) = NULL;
+
+static struct TrackerFunctions
{
-#define MAP(a,v) { #a, (gpointer *)&a, v }
- MAP (tracker_connect, TRACKER_0_6 | TRACKER_0_7),
- MAP (tracker_disconnect, TRACKER_0_6 | TRACKER_0_7),
- MAP (tracker_get_version, TRACKER_0_6),
- MAP (tracker_cancel_last_call, TRACKER_0_6 | TRACKER_0_7 | TRACKER_0_8 | TRACKER_0_9),
- MAP (tracker_search_metadata_by_text_async, TRACKER_0_6 | TRACKER_0_7),
- MAP (tracker_search_metadata_by_text_and_location_async, TRACKER_0_6 | TRACKER_0_7),
- MAP (tracker_client_new, TRACKER_0_8 | TRACKER_0_9),
- MAP (tracker_sparql_escape, TRACKER_0_8 | TRACKER_0_9),
- MAP (tracker_resources_sparql_query_async, TRACKER_0_8 | TRACKER_0_9)
-#undef MAP
+ const char *name;
+ gpointer *pointer;
+} funcs[] = {
+ MODULE_MAP (tracker_sparql_connection_get_type),
+ MODULE_MAP (tracker_sparql_connection_get),
+ MODULE_MAP (tracker_sparql_connection_query_async),
+ MODULE_MAP (tracker_sparql_connection_query_finish),
+ MODULE_MAP (tracker_sparql_cursor_get_type),
+ MODULE_MAP (tracker_sparql_cursor_next_async),
+ MODULE_MAP (tracker_sparql_cursor_next_finish),
+ MODULE_MAP (tracker_sparql_cursor_get_string),
+ MODULE_MAP (tracker_sparql_escape_string)
};
-static TrackerVersion
-open_libtracker (void)
+static gboolean
+init (void)
{
- static gboolean done = FALSE;
- static TrackerVersion version = TRACKER_UNAVAILABLE;
-
- if (!done)
- {
- gint i;
- GModule *tracker;
- GModuleFlags flags;
-
- done = TRUE;
- flags = G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL;
-
- /* So this is the order:
- *
- * - 0.9 (latest unstable)
- * - 0.8 (stable)
- * - 0.7 (unstable, 0.6 sucks so badly)
- * - 0.6 (stable)
- */
- if ((tracker = g_module_open ("libtracker-client-0.9.so.0", flags)) != NULL)
- version = TRACKER_0_9;
- else if ((tracker = g_module_open ("libtracker-client-0.8.so.0", flags)) != NULL)
- version = TRACKER_0_8;
- else if ((tracker = g_module_open ("libtracker-client-0.7.so.0", flags)) != NULL)
- version = TRACKER_0_7;
- else if ((tracker = g_module_open ("libtrackerclient.so.0", flags)) != NULL)
- version = TRACKER_0_6;
- else
- {
- g_debug ("No tracker backend available");
- return TRACKER_UNAVAILABLE;
- }
-
- for (i = 0; i < G_N_ELEMENTS (tracker_dl_mapping); i++)
- {
- if ((tracker_dl_mapping[i].versions & version) == 0)
- continue;
-
- if (!g_module_symbol (tracker,
- tracker_dl_mapping[i].fn_name,
- tracker_dl_mapping[i].fn_ptr_ref))
- {
- g_warning ("Missing symbol '%s' in libtracker\n",
- tracker_dl_mapping[i].fn_name);
- g_module_close (tracker);
-
- for (i = 0; i < G_N_ELEMENTS (tracker_dl_mapping); i++)
- tracker_dl_mapping[i].fn_ptr_ref = NULL;
-
- return TRACKER_UNAVAILABLE;
+ static gboolean inited = FALSE;
+ gint i;
+ GModule *m;
+ GModuleFlags flags;
+
+ if (inited)
+ return TRUE;
+
+ flags = G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL;
+
+ /* Only support 0.10 onwards */
+ if ((m = g_module_open (MODULE_FILENAME, flags)) == NULL)
+ {
+ g_debug ("No tracker backend available or it is not new enough");
+ g_debug ("Only available using '%s'", MODULE_FILENAME);
+ return FALSE;
+ }
+
+ inited = TRUE;
+
+ /* Check for the symbols we need */
+ for (i = 0; i < G_N_ELEMENTS (funcs); i++)
+ {
+ if (!g_module_symbol (m, funcs[i].name, funcs[i].pointer))
+ {
+ g_warning ("Missing symbol '%s' in libtracker-sparql\n",
+ funcs[i].name);
+ g_module_close (m);
+ }
+
+ for (i = 0; i < G_N_ELEMENTS (funcs); i++)
+ funcs[i].pointer = NULL;
+
+ return FALSE;
}
- }
- }
- return version;
+ g_debug ("Loaded Tracker library and all required symbols");
+
+ return TRUE;
}
+/*
+ * GtkSearchEngineTracker object
+ */
struct _GtkSearchEngineTrackerPrivate
{
- GtkQuery *query;
- TrackerClient *client;
- gboolean query_pending;
- TrackerVersion version;
+ TrackerSparqlConnection *connection;
+ GCancellable *cancellable;
+ GtkQuery *query;
+ gboolean query_pending;
};
G_DEFINE_TYPE (GtkSearchEngineTracker, _gtk_search_engine_tracker, GTK_TYPE_SEARCH_ENGINE);
+static void cursor_callback (GObject *object,
+ GAsyncResult *result,
+ gpointer user_data);
static void
finalize (GObject *object)
@@ -181,56 +155,106 @@ finalize (GObject *object)
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->version == TRACKER_0_8 ||
- tracker->priv->version == TRACKER_0_9)
- g_object_unref (tracker->priv->client);
- else
- tracker_disconnect (tracker->priv->client);
+ 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 void
+cursor_next (GtkSearchEngineTracker *tracker,
+ TrackerSparqlCursor *cursor)
+{
+ tracker_sparql_cursor_next_async (cursor,
+ tracker->priv->cancellable,
+ cursor_callback,
+ tracker);
+}
-/* stolen from tracker sources, tracker.c */
static void
-sparql_append_string_literal (GString *sparql,
- const gchar *str)
+cursor_callback (GObject *object,
+ GAsyncResult *result,
+ gpointer user_data)
{
- gchar *s;
+ GtkSearchEngineTracker *tracker;
+ GError *error = NULL;
+ TrackerSparqlCursor *cursor;
+ GList *hits;
+ gboolean success;
- s = tracker_sparql_escape (str);
+ tracker = GTK_SEARCH_ENGINE_TRACKER (user_data);
- g_string_append_c (sparql, '"');
- g_string_append (sparql, s);
- g_string_append_c (sparql, '"');
+ cursor = TRACKER_SPARQL_CURSOR (object);
+ success = tracker_sparql_cursor_next_finish (cursor, result, &error);
- g_free (s);
-}
+ if (error)
+ {
+ _gtk_search_engine_error (GTK_SEARCH_ENGINE (tracker), error->message);
+ g_error_free (error);
+
+ if (cursor)
+ g_object_unref (cursor);
+
+ return;
+ }
+
+ if (!success)
+ {
+ _gtk_search_engine_finished (GTK_SEARCH_ENGINE (tracker));
+
+ if (cursor)
+ g_object_unref (cursor);
+
+ return;
+ }
+
+ /* We iterate result by result, not n at a time. */
+ hits = g_list_append (NULL, (gchar*) tracker_sparql_cursor_get_string (cursor, 0, NULL));
+ _gtk_search_engine_hits_added (GTK_SEARCH_ENGINE (tracker), hits);
+ g_list_free (hits);
+
+ /* Get next */
+ cursor_next (tracker, cursor);
+}
static void
-search_callback (gpointer results,
- GError *error,
- gpointer user_data)
+query_callback (GObject *object,
+ GAsyncResult *result,
+ gpointer user_data)
{
GtkSearchEngineTracker *tracker;
- gchar **results_p;
- GList *hit_uris;
- GPtrArray *OUT_result;
- gchar *uri;
- gint i;
+ TrackerSparqlConnection *connection;
+ TrackerSparqlCursor *cursor;
+ GError *error = NULL;
tracker = GTK_SEARCH_ENGINE_TRACKER (user_data);
- hit_uris = NULL;
tracker->priv->query_pending = FALSE;
+ connection = TRACKER_SPARQL_CONNECTION (object);
+ cursor = tracker_sparql_connection_query_finish (connection,
+ result,
+ &error);
+
+ g_debug ("Query returned cursor:%p", cursor);
+
if (error)
{
_gtk_search_engine_error (GTK_SEARCH_ENGINE (tracker), error->message);
@@ -238,118 +262,77 @@ search_callback (gpointer results,
return;
}
- if (!results)
- return;
+ if (!cursor)
+ {
+ _gtk_search_engine_finished (GTK_SEARCH_ENGINE (tracker));
+ return;
+ }
- if (tracker->priv->version == TRACKER_0_8 ||
- tracker->priv->version == TRACKER_0_9)
- {
- OUT_result = (GPtrArray*) results;
+ cursor_next (tracker, cursor);
+}
- for (i = 0; i < OUT_result->len; i++)
- {
- uri = g_strdup (((gchar **) OUT_result->pdata[i])[0]);
- if (uri)
- hit_uris = g_list_prepend (hit_uris, uri);
- }
+static void
+sparql_append_string_literal (GString *sparql,
+ const gchar *str)
+{
+ gchar *s;
- g_ptr_array_foreach (OUT_result, (GFunc) g_free, NULL);
- g_ptr_array_free (OUT_result, TRUE);
- }
- else
- {
- for (results_p = results; *results_p; results_p++)
- {
- if (tracker->priv->version == TRACKER_0_6)
- uri = g_filename_to_uri (*results_p, NULL, NULL);
- else
- uri = g_strdup (*results_p);
-
- if (uri)
- hit_uris = g_list_prepend (hit_uris, uri);
- }
- g_strfreev ((gchar **) results);
- }
+ s = tracker_sparql_escape_string (str);
- _gtk_search_engine_hits_added (GTK_SEARCH_ENGINE (tracker), hit_uris);
- _gtk_search_engine_finished (GTK_SEARCH_ENGINE (tracker));
+ g_string_append_c (sparql, '"');
+ g_string_append (sparql, s);
+ g_string_append_c (sparql, '"');
- g_list_foreach (hit_uris, (GFunc) g_free, NULL);
- g_list_free (hit_uris);
+ g_free (s);
}
-
static void
gtk_search_engine_tracker_start (GtkSearchEngine *engine)
{
GtkSearchEngineTracker *tracker;
- gchar *search_text, *location, *location_uri;
+ gchar *search_text, *location_uri;
GString *sparql;
tracker = GTK_SEARCH_ENGINE_TRACKER (engine);
if (tracker->priv->query_pending)
- return;
+ {
+ g_warning ("Attempt to start a new search while one is pending, doing nothing");
+ return;
+ }
if (tracker->priv->query == NULL)
- return;
+ {
+ g_warning ("Attempt to start a new search with no GtkQuery, doing nothing");
+ return;
+ }
search_text = _gtk_query_get_text (tracker->priv->query);
location_uri = _gtk_query_get_location (tracker->priv->query);
- location = NULL;
+ g_debug ("Query starting, search criteria:'%s', location:'%s'", search_text, location_uri);
+
+ sparql = g_string_new ("SELECT nie:url(?urn) WHERE { ?urn a nfo:FileDataObject; fts:match ");
+ sparql_append_string_literal (sparql, search_text);
+
if (location_uri)
- {
- if (tracker->priv->version == TRACKER_0_6)
- {
- location = g_filename_from_uri (location_uri, NULL, NULL);
- g_free (location_uri);
- }
- else
- location = location_uri;
- }
+ {
+ g_string_append (sparql, " . FILTER (fn:starts-with(nie:url(?urn),");
+ sparql_append_string_literal (sparql, location_uri);
+ g_string_append (sparql, "))");
+ }
- if (tracker->priv->version == TRACKER_0_8 ||
- tracker->priv->version == TRACKER_0_9)
- {
- sparql = g_string_new ("SELECT nie:url(?urn) WHERE { ?urn a nfo:FileDataObject; fts:match ");
- sparql_append_string_literal (sparql, search_text);
- if (location)
- {
- g_string_append (sparql, " . FILTER (fn:starts-with(nie:url(?urn),");
- sparql_append_string_literal (sparql, location);
- g_string_append (sparql, "))");
- }
- g_string_append (sparql, " } ORDER BY DESC(fts:rank(?urn)) ASC(nie:url(?urn))");
-
- tracker_resources_sparql_query_async (tracker->priv->client,
- sparql->str,
- (TrackerReplyGPtrArray) search_callback,
- tracker);
- g_string_free (sparql, TRUE);
- }
- else
- {
- if (location)
- {
- tracker_search_metadata_by_text_and_location_async (tracker->priv->client,
- search_text,
- location,
- (TrackerArrayReply) search_callback,
- tracker);
- }
- else
- {
- tracker_search_metadata_by_text_async (tracker->priv->client,
- search_text,
- (TrackerArrayReply) search_callback,
- tracker);
- }
- }
+ g_string_append (sparql, " } ORDER BY DESC(fts:rank(?urn)) ASC(nie:url(?urn))");
+
+ tracker_sparql_connection_query_async (tracker->priv->connection,
+ sparql->str,
+ tracker->priv->cancellable,
+ query_callback,
+ tracker);
+ g_string_free (sparql, TRUE);
tracker->priv->query_pending = TRUE;
g_free (search_text);
- g_free (location);
}
static void
@@ -359,9 +342,11 @@ gtk_search_engine_tracker_stop (GtkSearchEngine *engine)
tracker = GTK_SEARCH_ENGINE_TRACKER (engine);
+ g_debug ("Query stopping");
+
if (tracker->priv->query && tracker->priv->query_pending)
{
- tracker_cancel_last_call (tracker->priv->client);
+ g_cancellable_cancel (tracker->priv->cancellable);
tracker->priv->query_pending = FALSE;
}
}
@@ -374,7 +359,7 @@ gtk_search_engine_tracker_is_indexed (GtkSearchEngine *engine)
static void
gtk_search_engine_tracker_set_query (GtkSearchEngine *engine,
- GtkQuery *query)
+ GtkQuery *query)
{
GtkSearchEngineTracker *tracker;
@@ -410,7 +395,9 @@ _gtk_search_engine_tracker_class_init (GtkSearchEngineTrackerClass *class)
static void
_gtk_search_engine_tracker_init (GtkSearchEngineTracker *engine)
{
- engine->priv = G_TYPE_INSTANCE_GET_PRIVATE (engine, GTK_TYPE_SEARCH_ENGINE_TRACKER, GtkSearchEngineTrackerPrivate);
+ engine->priv = G_TYPE_INSTANCE_GET_PRIVATE (engine,
+ GTK_TYPE_SEARCH_ENGINE_TRACKER,
+ GtkSearchEngineTrackerPrivate);
}
@@ -418,49 +405,35 @@ GtkSearchEngine *
_gtk_search_engine_tracker_new (void)
{
GtkSearchEngineTracker *engine;
- TrackerClient *tracker_client;
- TrackerVersion version;
- GError *err = NULL;
-
- version = open_libtracker ();
-
- if (version == TRACKER_0_8 ||
- version == TRACKER_0_9)
- {
- tracker_client = tracker_client_new (TRACKER_CLIENT_ENABLE_WARNINGS, G_MAXINT);
- }
- else
- {
- if (!tracker_connect)
- return NULL;
-
- tracker_client = tracker_connect (FALSE, -1);
- }
-
- if (!tracker_client)
- return NULL;
-
-
- if (version == TRACKER_0_6)
- {
- if (!tracker_get_version)
- return NULL;
-
- tracker_get_version (tracker_client, &err);
-
- if (err != NULL)
- {
- g_error_free (err);
- tracker_disconnect (tracker_client);
- return NULL;
- }
- }
+ TrackerSparqlConnection *connection;
+ GCancellable *cancellable;
+ GError *error = NULL;
+
+ if (!init ())
+ return NULL;
+
+ g_debug ("Creating GtkSearchEngineTracker...");
+
+ cancellable = g_cancellable_new ();
+ connection = tracker_sparql_connection_get (cancellable, &error);
+
+ if (error)
+ {
+ g_warning ("Could not establish a connection to Tracker: %s", error->message);
+ g_error_free (error);
+ return NULL;
+ }
+ else if (!connection)
+ {
+ g_warning ("Could not establish a connection to Tracker, no TrackerSparqlConnection was returned");
+ return NULL;
+ }
engine = g_object_new (GTK_TYPE_SEARCH_ENGINE_TRACKER, NULL);
- engine->priv->client = tracker_client;
+ engine->priv->connection = connection;
+ engine->priv->cancellable = cancellable;
engine->priv->query_pending = FALSE;
- engine->priv->version = version;
return GTK_SEARCH_ENGINE (engine);
}
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