ephy-location-entry: add DNS prefetching

Proactively perform DNS lookups when the user sets the cursor over an
autocompleted entry in the location bar. This way the prefetching is likely to
already have been resolved by the time the user actually clicks on the entry.

https://bugzilla.gnome.org/show_bug.cgi?id=606087

1 files changed, 54 insertions, 5 deletions

diff --git a/lib/widgets/ephy-location-entry.c b/lib/widgets/ephy-location-entry.c
index 8624363b1..0ad827757 100644
--- a/lib/widgets/ephy-location-entry.c
+++ b/lib/widgets/ephy-location-entry.c
@@ -36,6 +36,7 @@
 #include <glib/gi18n.h>
 #include <gdk/gdkkeysyms.h>
 #include <gtk/gtk.h>
+#include <webkit/webkit.h>
 
 #include <string.h>
 
@@ -72,6 +73,8 @@ struct _EphyLocationEntryPrivate
 
 	guint hash;
 
+	gulong dns_prefetch_handler;
+
 	guint user_changed : 1;
 	guint can_redo : 1;
 	guint block_update : 1;
@@ -1008,7 +1011,8 @@ ephy_location_entry_init (EphyLocationEntry *le)
 	p->saved_text = NULL;
 	p->search_terms = NULL;
 	p->show_lock = FALSE;
-	
+	p->dns_prefetch_handler = 0;
+
 	ephy_location_entry_construct_contents (le);
 
 	gtk_tool_item_set_expand (GTK_TOOL_ITEM (le), TRUE);
@@ -1020,29 +1024,74 @@ ephy_location_entry_new (void)
 	return GTK_WIDGET (g_object_new (EPHY_TYPE_LOCATION_ENTRY, NULL));
 }
 
+typedef struct {
+	SoupURI *uri;
+	EphyLocationEntry *entry;
+} PrefetchHelper;
+
+static void
+free_prefetch_helper (PrefetchHelper *helper)
+{
+	soup_uri_free (helper->uri);
+	g_object_unref (helper->entry);
+	g_slice_free (PrefetchHelper, helper);
+}
+
+static gboolean
+do_dns_prefetch (PrefetchHelper *helper)
+{
+	SoupSession *session = webkit_get_default_session ();
+
+	soup_session_prepare_for_uri (session, helper->uri);
+
+	helper->entry->priv->dns_prefetch_handler = 0;
+
+	return FALSE;
+}
+
+static void
+schedule_dns_prefetch (EphyLocationEntry *entry, guint interval, const gchar *url)
+{
+	PrefetchHelper *helper;
+
+	if (entry->priv->dns_prefetch_handler)
+		g_source_remove (entry->priv->dns_prefetch_handler);
+
+	helper = g_slice_new0 (PrefetchHelper);
+	helper->entry = g_object_ref (entry);
+	helper->uri = soup_uri_new (url);
+
+	entry->priv->dns_prefetch_handler =
+		g_timeout_add_full (G_PRIORITY_DEFAULT, interval,
+				    (GSourceFunc) do_dns_prefetch, helper,
+				    (GDestroyNotify) free_prefetch_helper);
+}
+
 static gboolean
 cursor_on_match_cb  (GtkEntryCompletion *completion,
 		     GtkTreeModel *model,
 		     GtkTreeIter *iter,
 		     EphyLocationEntry *le)
 {
-	char *item = NULL;
+	char *url = NULL;
 	GtkWidget *entry;
 
 	gtk_tree_model_get (model, iter,
 			    le->priv->url_col,
-			    &item, -1);
+			    &url, -1);
 	entry = gtk_entry_completion_get_entry (completion);
 
 	/* Prevent the update so we keep the highlight from our input.
 	 * See textcell_data_func().
 	 */
 	le->priv->block_update = TRUE;
-	gtk_entry_set_text (GTK_ENTRY (entry), item);
+	gtk_entry_set_text (GTK_ENTRY (entry), url);
 	gtk_editable_set_position (GTK_EDITABLE (entry), -1);
 	le->priv->block_update = FALSE;
 
-	g_free (item);
+	schedule_dns_prefetch (le, 250, (const gchar*) url);
+
+	g_free (url);
 
 	return TRUE;
 }