[gnome-photos/wip/rishi/delete-pending-photos-on-close: 1/2] base-item: Convert photos_base_item_trash to async API

[Debarshi Ray <debarshir src gnome org>]

commit c855a5a7cce5d023c091b24c2583e76b2a8fcd42
Author: Abanoub Ghadban <abanoub gdb gmail com>
Date:   Sun Mar 14 12:42:22 2021 +0100

    base-item: Convert photos_base_item_trash to async API
    
    This enables the caller to handle any error, and properly manages the
    lifetime of the asynchronous operation by keeping the application and
    the item alive while it's in flight.
    
    A subsequent commit will use this to ensure that items marked for
    deletion do get deleted when the main window is closed.
    
    https://gitlab.gnome.org/GNOME/gnome-photos/-/issues/92

 src/photos-base-item.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++--
 src/photos-base-item.h |  9 +++++++-
 2 files changed, 63 insertions(+), 3 deletions(-)
---
diff --git a/src/photos-base-item.c b/src/photos-base-item.c
index f9d66865..f0c3391b 100644
--- a/src/photos-base-item.c
+++ b/src/photos-base-item.c
@@ -2742,6 +2742,31 @@ photos_base_item_save_to_stream_load (GObject *source_object, GAsyncResult *res,
 }
 
 
+static void
+photo_base_item_trash_executed (GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+  GApplication *app;
+  g_autoptr (GTask) task = G_TASK (user_data);
+  PhotosDeleteItemJob *job = PHOTOS_DELETE_ITEM_JOB (source_object);
+
+  {
+    g_autoptr (GError) error = NULL;
+
+    if (!photos_delete_item_job_finish (job, res, &error))
+      {
+        g_task_return_error (task, error);
+        goto out;
+      }
+  }
+
+  g_task_return_boolean (task, TRUE);
+
+ out:
+  app = g_application_get_default ();
+  g_application_release (app);
+}
+
+
 static void
 photos_base_item_update_info_from_type (PhotosBaseItem *self)
 {
@@ -4728,18 +4753,46 @@ photos_base_item_set_favorite (PhotosBaseItem *self, gboolean favorite)
 
 
 void
-photos_base_item_trash (PhotosBaseItem *self)
+photos_base_item_trash_async (PhotosBaseItem *self,
+                              GCancellable *cancellable,
+                              GAsyncReadyCallback callback,
+                              gpointer user_data)
 {
   PhotosBaseItemPrivate *priv;
+  GApplication *app;
+  g_autoptr (GTask) task = NULL;
   g_autoptr (PhotosDeleteItemJob) job = NULL;
 
   g_return_if_fail (PHOTOS_IS_BASE_ITEM (self));
   priv = photos_base_item_get_instance_private (self);
 
+  task = g_task_new (self, cancellable, callback, user_data);
+  g_task_set_source_tag (task, photos_base_item_trash_async);
+
   PHOTOS_BASE_ITEM_GET_CLASS (self)->trash (self);
 
+  app = g_application_get_default ();
   job = photos_delete_item_job_new (priv->id);
-  photos_delete_item_job_run (job, NULL, NULL, NULL);
+
+  g_application_hold (app);
+  photos_delete_item_job_run (job, cancellable, photo_base_item_trash_executed, g_object_ref (task));
+}
+
+
+gboolean
+photos_base_item_trash_finish (PhotosBaseItem *self, GAsyncResult *res, GError **error)
+{
+  GTask *task;
+
+  g_return_val_if_fail (PHOTOS_IS_BASE_ITEM (self), FALSE);
+
+  g_return_val_if_fail (g_task_is_valid (res, self), FALSE);
+  task = G_TASK (res);
+
+  g_return_val_if_fail (g_task_get_source_tag (task) == photos_base_item_trash_async, FALSE);
+  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+  return g_task_propagate_boolean (task, error);
 }
 
 
diff --git a/src/photos-base-item.h b/src/photos-base-item.h
index add8b339..20f971ce 100644
--- a/src/photos-base-item.h
+++ b/src/photos-base-item.h
@@ -333,7 +333,14 @@ void                photos_base_item_set_default_app_name    (PhotosBaseItem *se
 
 void                photos_base_item_set_favorite            (PhotosBaseItem *self, gboolean favorite);
 
-void                photos_base_item_trash                   (PhotosBaseItem *self);
+void                photos_base_item_trash_async             (PhotosBaseItem *self,
+                                                              GCancellable *cancellable,
+                                                              GAsyncReadyCallback callback,
+                                                              gpointer user_data);
+
+gboolean            photos_base_item_trash_finish            (PhotosBaseItem *self,
+                                                              GAsyncResult *res,
+                                                              GError **error);
 
 void                photos_base_item_unmark_busy             (PhotosBaseItem *self);