[gnome-software/wip/ubuntu-3-26: 4/15] Download changelog information on demand - this stops the UI blocking on startup

[Robert Ancell <rancell src gnome org>]

commit ba1c8f7a650a4d0a28ec61e6e89446bf9bc1ddf8
Author: Robert Ancell <robert ancell canonical com>
Date:   Mon Nov 7 16:55:18 2016 +1300

    Download changelog information on demand - this stops the UI blocking on startup

 lib/gs-plugin-types.h  |    2 ++
 src/gs-update-dialog.c |   40 +++++++++++++++++++++++++++++++++++++---
 2 files changed, 39 insertions(+), 3 deletions(-)
---
diff --git a/lib/gs-plugin-types.h b/lib/gs-plugin-types.h
index f31dbf9..759ef49 100644
--- a/lib/gs-plugin-types.h
+++ b/lib/gs-plugin-types.h
@@ -149,6 +149,7 @@ typedef enum {
  * @GS_PLUGIN_REFINE_FLAGS_REQUIRE_ORIGIN_UI:          Require the origin for UI
  * @GS_PLUGIN_REFINE_FLAGS_REQUIRE_RUNTIME:            Require the runtime
  * @GS_PLUGIN_REFINE_FLAGS_REQUIRE_SCREENSHOTS:                Require screenshot information
+ * @GS_PLUGIN_REFINE_FLAGS_REQUIRE_CHANGELOG:          Require the changelog
  *
  * The refine flags.
  **/
@@ -180,6 +181,7 @@ typedef enum {
 #define GS_PLUGIN_REFINE_FLAGS_REQUIRE_ORIGIN_UI       ((guint64) 1 << 24)
 #define GS_PLUGIN_REFINE_FLAGS_REQUIRE_RUNTIME         ((guint64) 1 << 25)
 #define GS_PLUGIN_REFINE_FLAGS_REQUIRE_SCREENSHOTS     ((guint64) 1 << 26)
+#define GS_PLUGIN_REFINE_FLAGS_REQUIRE_CHANGELOG       ((guint64) 1 << 27)
 typedef guint64 GsPluginRefineFlags;
 
 /**
diff --git a/src/gs-update-dialog.c b/src/gs-update-dialog.c
index ec67027..4177db2 100644
--- a/src/gs-update-dialog.c
+++ b/src/gs-update-dialog.c
@@ -49,6 +49,7 @@ struct _GsUpdateDialog
        GQueue          *back_entry_stack;
        GCancellable    *cancellable;
        GsPluginLoader  *plugin_loader;
+       GsApp           *app;
        GtkWidget       *box_header;
        GtkWidget       *button_back;
        GtkWidget       *image_icon;
@@ -95,12 +96,33 @@ back_entry_free (BackEntry *entry)
 }
 
 static void
+refine_cb (GsPluginLoader *plugin_loader, GAsyncResult *res, GsUpdateDialog *dialog)
+{
+       const gchar *update_details;
+       g_autoptr(GError) error = NULL;
+
+       if (!gs_plugin_loader_job_action_finish (plugin_loader, res, &error))
+               g_warning ("Failed to get changelog information: %s", error->message);
+
+       update_details = gs_app_get_update_details (dialog->app);
+       if (update_details == NULL) {
+               /* TRANSLATORS: this is where the packager did not write
+                * a description for the update */
+               update_details = _("No update description available.");
+       }
+
+       gtk_label_set_label (GTK_LABEL (dialog->label_details), update_details);
+}
+
+static void
 set_updates_description_ui (GsUpdateDialog *dialog, GsApp *app)
 {
        AsAppKind kind;
        const GdkPixbuf *pixbuf;
        const gchar *update_details;
 
+       g_set_object (&dialog->app, app);
+
        /* set window title */
        kind = gs_app_get_kind (app);
        if (kind == AS_APP_KIND_OS_UPDATE) {
@@ -124,9 +146,20 @@ set_updates_description_ui (GsUpdateDialog *dialog, GsApp *app)
        gtk_widget_set_visible (dialog->box_header, kind == AS_APP_KIND_DESKTOP);
        update_details = gs_app_get_update_details (app);
        if (update_details == NULL) {
-               /* TRANSLATORS: this is where the packager did not write
-                * a description for the update */
-               update_details = _("No update description available.");
+               g_autoptr(GsPluginJob) plugin_job = NULL;
+
+               /* TRANSLATORS: this is displayed while the changelog is being downloaded */
+               update_details = _("Downloading change information…");
+
+               plugin_job = gs_plugin_job_newv (GS_PLUGIN_ACTION_REFINE,
+                                                "app", app,
+                                                "refine-flags", GS_PLUGIN_REFINE_FLAGS_REQUIRE_CHANGELOG,
+                                                NULL);
+               gs_plugin_loader_job_process_async (dialog->plugin_loader,
+                                                   plugin_job,
+                                                   dialog->cancellable,
+                                                   (GAsyncReadyCallback) refine_cb,
+                                                   dialog);
        }
        gtk_label_set_label (GTK_LABEL (dialog->label_details), update_details);
        gtk_label_set_label (GTK_LABEL (dialog->label_name), gs_app_get_name (app));
@@ -653,6 +686,7 @@ gs_update_dialog_dispose (GObject *object)
        }
 
        g_clear_object (&dialog->plugin_loader);
+       g_clear_object (&dialog->app);
 
        G_OBJECT_CLASS (gs_update_dialog_parent_class)->dispose (object);
 }