[epiphany] ephy-location-entry: add DNS prefetching

[Sergio Villar Senin <svillar src gnome org>]

commit 7b24139e069c3de30cdafe983cfb6eb90c097362
Author: Sergio Villar Senin <svillar igalia com>
Date:   Mon Feb 21 18:38:59 2011 +0100

    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

 lib/widgets/ephy-location-entry.c |   59 +++++++++++++++++++++++++++++++++---
 1 files changed, 54 insertions(+), 5 deletions(-)
---
diff --git a/lib/widgets/ephy-location-entry.c b/lib/widgets/ephy-location-entry.c
index 8624363..0ad8277 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;
 }