Add e_load_cal_source_async().

Similar to e_load_book_source_async() in libedataserverui (and may wind
up there eventually).  This replaces e_auth_new_cal_from_source().

  void   e_load_cal_source_async  (ESource *source,
                                   ECalSourceType source_type,
                                   icaltimezone *default_zone,
                                   GtkWindow *parent,
                                   GCancellable *cancellable,
                                   GAsyncReadyCallback callback,
                                   gpointer user_data);

  ECal * e_load_cal_source_finish (ESource *source,
                                   GAsyncResult *result,
                                   GError **error);

6 files changed, 376 insertions, 331 deletions

diff --git a/modules/calendar/e-cal-shell-backend.c b/modules/calendar/e-cal-shell-backend.c
index 8861a82cf3..e72626304e 100644
--- a/modules/calendar/e-cal-shell-backend.c
+++ b/modules/calendar/e-cal-shell-backend.c
@@ -221,20 +221,19 @@ cal_shell_backend_ensure_sources (EShellBackend *shell_backend)
 }
 
 static void
-cal_shell_backend_new_event (ECal *cal,
-                             const GError *error,
+cal_shell_backend_new_event (ESource *source,
+                             GAsyncResult *result,
                              EShell *shell,
                              CompEditorFlags flags,
                              gboolean all_day)
 {
+	ECal *cal;
 	ECalComponent *comp;
 	CompEditor *editor;
 
 	/* XXX Handle errors better. */
-	if (error)
-		return;
-
-	flags |= COMP_EDITOR_NEW_ITEM;
+	cal = e_load_cal_source_finish (source, result, NULL);
+	g_return_if_fail (E_IS_CAL (cal));
 
 	editor = event_editor_new (cal, shell, flags);
 	comp = cal_comp_event_new_with_current_time (cal, all_day);
@@ -244,68 +243,77 @@ cal_shell_backend_new_event (ECal *cal,
 	gtk_window_present (GTK_WINDOW (editor));
 
 	g_object_unref (comp);
+	g_object_unref (cal);
 }
 
 static void
-cal_shell_backend_event_new_cb (ECal *cal,
-                                const GError *error,
+cal_shell_backend_event_new_cb (ESource *source,
+                                GAsyncResult *result,
                                 EShell *shell)
 {
-	CompEditorFlags flags;
+	CompEditorFlags flags = 0;
+	gboolean all_day = FALSE;
 
-	flags = COMP_EDITOR_USER_ORG;
-	cal_shell_backend_new_event (cal, error, shell, flags, FALSE);
+	flags |= COMP_EDITOR_NEW_ITEM;
+	flags |= COMP_EDITOR_USER_ORG;
 
-	g_object_unref (cal);
+	cal_shell_backend_new_event (source, result, shell, flags, all_day);
+
+	g_object_unref (shell);
 }
 
 static void
-cal_shell_backend_event_all_day_new_cb (ECal *cal,
-                                        const GError *error,
+cal_shell_backend_event_all_day_new_cb (ESource *source,
+                                        GAsyncResult *result,
                                         EShell *shell)
 {
-	CompEditorFlags flags;
+	CompEditorFlags flags = 0;
+	gboolean all_day = TRUE;
 
-	flags = COMP_EDITOR_USER_ORG;
-	cal_shell_backend_new_event (cal, error, shell, flags, TRUE);
+	flags |= COMP_EDITOR_NEW_ITEM;
+	flags |= COMP_EDITOR_USER_ORG;
 
-	g_object_unref (cal);
+	cal_shell_backend_new_event (source, result, shell, flags, all_day);
+
+	g_object_unref (shell);
 }
 
 static void
-cal_shell_backend_event_meeting_new_cb (ECal *cal,
-                                        const GError *error,
+cal_shell_backend_event_meeting_new_cb (ESource *source,
+                                        GAsyncResult *result,
                                         EShell *shell)
 {
-	CompEditorFlags flags;
+	CompEditorFlags flags = 0;
+	gboolean all_day = FALSE;
 
-	flags = COMP_EDITOR_USER_ORG | COMP_EDITOR_MEETING;
-	cal_shell_backend_new_event (cal, error, shell, flags, FALSE);
+	flags |= COMP_EDITOR_NEW_ITEM;
+	flags |= COMP_EDITOR_USER_ORG;
+	flags |= COMP_EDITOR_MEETING;
 
-	g_object_unref (cal);
+	cal_shell_backend_new_event (source, result, shell, flags, all_day);
+
+	g_object_unref (shell);
 }
 
 static void
 action_event_new_cb (GtkAction *action,
                      EShellWindow *shell_window)
 {
-	ECal *cal = NULL;
-	ECalSourceType source_type;
-	ESourceList *source_list;
-	EShellSettings *shell_settings;
-	EShellView *shell_view;
 	EShell *shell;
-	const gchar *view_name;
+	EShellView *shell_view;
+	EShellBackend *shell_backend;
+	EShellSettings *shell_settings;
+	ESource *source = NULL;
+	ESourceList *source_list;
+	ECalSourceType source_type;
 	const gchar *action_name;
 	gchar *uid;
 
 	/* With a 'calendar' active shell view pass the new appointment
 	 * request to it, thus the event will inherit selected time from
 	 * the view. */
-	view_name = e_shell_window_get_active_view (shell_window);
-	shell_view = e_shell_window_get_shell_view (shell_window, view_name);
-
-	if (shell_view && g_ascii_strcasecmp (view_name, "calendar") == 0) {
+	shell_view = e_shell_window_peek_shell_view (shell_window, "calendar");
+	if (shell_view != NULL) {
 		EShellContent *shell_content;
 		GnomeCalendar *gcal;
 		GnomeCalendarViewType view_type;
@@ -338,48 +346,50 @@ action_event_new_cb (GtkAction *action,
 
 	shell = e_shell_window_get_shell (shell_window);
 	shell_settings = e_shell_get_shell_settings (shell);
+	shell_backend = e_shell_get_backend_by_name (shell, "calendar");
 
-	if (!e_cal_get_sources (&source_list, source_type, NULL)) {
-		g_warning ("Could not get calendar sources from GConf!");
-		return;
-	}
+	g_object_get (shell_backend, "source-list", &source_list, NULL);
+	g_return_if_fail (E_IS_SOURCE_LIST (source_list));
 
 	uid = e_shell_settings_get_string (
 		shell_settings, "cal-primary-calendar");
 
 	if (uid != NULL) {
-		ESource *source;
-
 		source = e_source_list_peek_source_by_uid (source_list, uid);
-		if (source != NULL)
-			cal = e_auth_new_cal_from_source (source, source_type);
 		g_free (uid);
 	}
 
-	if (cal == NULL)
-		cal = e_auth_new_cal_from_default (source_type);
+	if (source == NULL)
+		source = e_source_list_peek_default_source (source_list);
 
-	g_return_if_fail (cal != NULL);
+	g_return_if_fail (E_IS_SOURCE (source));
 
-	/* Connect the appropriate signal handler. */
+	/* Use a callback function appropriate for the action.
+	 * FIXME Need to obtain a better default time zone. */
 	action_name = gtk_action_get_name (action);
 	if (strcmp (action_name, "event-all-day-new") == 0)
-		g_signal_connect (
-			cal, "cal-opened-ex",
-			G_CALLBACK (cal_shell_backend_event_all_day_new_cb),
-			shell);
+		e_load_cal_source_async (
+			source, source_type, NULL,
+			GTK_WINDOW (shell_window),
+			NULL, (GAsyncReadyCallback)
+			cal_shell_backend_event_all_day_new_cb,
+			g_object_ref (shell));
 	else if (strcmp (action_name, "event-meeting-new") == 0)
-		g_signal_connect (
-			cal, "cal-opened-ex",
-			G_CALLBACK (cal_shell_backend_event_meeting_new_cb),
-			shell);
+		e_load_cal_source_async (
+			source, source_type, NULL,
+			GTK_WINDOW (shell_window),
+			NULL, (GAsyncReadyCallback)
+			cal_shell_backend_event_meeting_new_cb,
+			g_object_ref (shell));
 	else
-		g_signal_connect (
-			cal, "cal-opened-ex",
-			G_CALLBACK (cal_shell_backend_event_new_cb),
-			shell);
+		e_load_cal_source_async (
+			source, source_type, NULL,
+			GTK_WINDOW (shell_window),
+			NULL, (GAsyncReadyCallback)
+			cal_shell_backend_event_new_cb,
+			g_object_ref (shell));
 
-	e_cal_open_async (cal, FALSE);
+	g_object_unref (source_list);
 }
 
 static void
diff --git a/modules/calendar/e-cal-shell-sidebar.c b/modules/calendar/e-cal-shell-sidebar.c
index 1cd4ba9619..a819d88473 100644
--- a/modules/calendar/e-cal-shell-sidebar.c
+++ b/modules/calendar/e-cal-shell-sidebar.c
@@ -59,6 +59,8 @@ struct _ECalShellSidebarPrivate {
 	 * sometime later we update our default-client property
 	 * which is bound by an EBinding to ECalModel. */
 	ECal *default_client;
+
+	GCancellable *loading_default_client;
 };
 
 enum {
@@ -241,104 +243,106 @@ cal_shell_sidebar_client_opened_cb (ECalShellSidebar *cal_shell_sidebar,
 }
 
 static void
-cal_shell_sidebar_default_opened_cb (ECalShellSidebar *cal_shell_sidebar,
-                                     const GError *error,
-                                     ECal *client)
+cal_shell_sidebar_default_loaded_cb (ESource *source,
+                                     GAsyncResult *result,
+                                     EShellSidebar *shell_sidebar)
 {
+	ECalShellSidebarPrivate *priv;
+	EShellWindow *shell_window;
 	EShellView *shell_view;
-	EShellSidebar *shell_sidebar;
+	ECal *client;
+	GError *error = NULL;
+
+	priv = E_CAL_SHELL_SIDEBAR_GET_PRIVATE (shell_sidebar);
 
-	shell_sidebar = E_SHELL_SIDEBAR (cal_shell_sidebar);
 	shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
+	shell_window = e_shell_view_get_shell_window (shell_view);
 
-	if (g_error_matches (error, E_CALENDAR_ERROR,
-		E_CALENDAR_STATUS_AUTHENTICATION_FAILED) ||
-	    g_error_matches (error, E_CALENDAR_ERROR,
-		E_CALENDAR_STATUS_AUTHENTICATION_REQUIRED))
-		e_auth_cal_forget_password (client);
+	client = e_load_cal_source_finish (source, result, &error);
 
-	/* Handle errors. */
-	switch (error ? error->code : E_CALENDAR_STATUS_OK) {
-		case E_CALENDAR_STATUS_OK:
-			break;
+	if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
+		g_error_free (error);
+		goto exit;
 
-		case E_CALENDAR_STATUS_AUTHENTICATION_FAILED:
-			e_cal_open_async (client, FALSE);
-			return;
+	} else if (error != NULL) {
+		e_alert_run_dialog_for_args (
+			GTK_WINDOW (shell_window),
+			"calendar:failed-open-calendar",
+			error->message, NULL);
+		g_error_free (error);
+		goto exit;
+	}
 
-		case E_CALENDAR_STATUS_BUSY:
-			return;
+	g_return_if_fail (E_IS_CAL (client));
 
-		default:
-			e_alert_run_dialog_for_args (
-				GTK_WINDOW (e_shell_view_get_shell_window (shell_view)),
-				"calendar:failed-open-calendar",
-				error->message, NULL);
+	if (priv->default_client != NULL)
+		g_object_unref (priv->default_client);
 
-			e_cal_shell_sidebar_remove_source (
-				cal_shell_sidebar,
-				e_cal_get_source (client));
-			return;
-	}
+	priv->default_client = client;
 
-	g_assert (error == NULL);
+	g_object_notify (G_OBJECT (shell_sidebar), "default-client");
 
-	g_signal_handlers_disconnect_matched (
-		client, G_SIGNAL_MATCH_FUNC, 0, 0, NULL,
-		cal_shell_sidebar_default_opened_cb, NULL);
-
-	g_object_notify (G_OBJECT (cal_shell_sidebar), "default-client");
+exit:
+	g_object_unref (shell_sidebar);
 }
 
 static void
 cal_shell_sidebar_set_default (ECalShellSidebar *cal_shell_sidebar,
                                ESource *source)
 {
+	ECalShellSidebarPrivate *priv;
 	EShellView *shell_view;
+	EShellWindow *shell_window;
 	EShellContent *shell_content;
 	EShellSidebar *shell_sidebar;
 	ECalShellContent *cal_shell_content;
 	ECalSourceType source_type;
-	GHashTable *client_table;
 	ECalModel *model;
 	ECal *client;
 	icaltimezone *timezone;
 	const gchar *uid;
 
+	priv = cal_shell_sidebar->priv;
 	source_type = E_CAL_SOURCE_TYPE_EVENT;
-	client_table = cal_shell_sidebar->priv->client_table;
-
-	uid = e_source_peek_uid (source);
-	client = g_hash_table_lookup (client_table, uid);
-
-	if (cal_shell_sidebar->priv->default_client != NULL)
-		g_object_unref (cal_shell_sidebar->priv->default_client);
-
-	if (client != NULL)
-		g_object_ref (client);
-	else
-		client = e_auth_new_cal_from_source (source, source_type);
-
-	cal_shell_sidebar->priv->default_client = client;
-	g_return_if_fail (client != NULL);
-
-	g_signal_connect_swapped (
-		client, "cal-opened-ex",
-		G_CALLBACK (cal_shell_sidebar_default_opened_cb),
-		cal_shell_sidebar);
 
 	/* FIXME Sidebar should not be accessing the EShellContent.
 	 *       This probably needs to be moved to ECalShellView. */
 	shell_sidebar = E_SHELL_SIDEBAR (cal_shell_sidebar);
 	shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
 	shell_content = e_shell_view_get_shell_content (shell_view);
+	shell_window = e_shell_view_get_shell_window (shell_view);
 
 	cal_shell_content = E_CAL_SHELL_CONTENT (shell_content);
 	model = e_cal_shell_content_get_model (cal_shell_content);
 	timezone = e_cal_model_get_timezone (model);
 
-	e_cal_set_default_timezone (client, timezone, NULL);
-	e_cal_open_async (client, FALSE);
+	/* Cancel any unfinished previous request. */
+	if (priv->loading_default_client != NULL) {
+		g_cancellable_cancel (priv->loading_default_client);
+		g_object_unref (priv->loading_default_client);
+		priv->loading_default_client = NULL;
+	}
+
+	uid = e_source_peek_uid (source);
+	client = g_hash_table_lookup (priv->client_table, uid);
+
+	/* If we already have an open connection for
+	 * this UID, we can finish immediately. */
+	if (client != NULL) {
+		if (priv->default_client != NULL)
+			g_object_unref (priv->default_client);
+		priv->default_client = g_object_ref (client);
+		g_object_notify (G_OBJECT (shell_sidebar), "default-client");
+		return;
+	}
+
+	priv->loading_default_client = g_cancellable_new ();
+
+	e_load_cal_source_async (
+		source, source_type, timezone,
+		GTK_WINDOW (shell_window), priv->loading_default_client,
+		(GAsyncReadyCallback) cal_shell_sidebar_default_loaded_cb,
+		g_object_ref (shell_sidebar));
 }
 
 static void
@@ -572,6 +576,12 @@ cal_shell_sidebar_dispose (GObject *object)
 		priv->default_client = NULL;
 	}
 
+	if (priv->loading_default_client != NULL) {
+		g_cancellable_cancel (priv->loading_default_client);
+		g_object_unref (priv->loading_default_client);
+		priv->loading_default_client = NULL;
+	}
+
 	g_hash_table_remove_all (priv->client_table);
 
 	/* Chain up to parent's dispose() method. */
diff --git a/modules/calendar/e-memo-shell-backend.c b/modules/calendar/e-memo-shell-backend.c
index 8f5bf40825..d54c32f98e 100644
--- a/modules/calendar/e-memo-shell-backend.c
+++ b/modules/calendar/e-memo-shell-backend.c
@@ -153,19 +153,18 @@ memo_shell_backend_ensure_sources (EShellBackend *shell_backend)
 }
 
 static void
-memo_shell_backend_memo_new_cb (ECal *cal,
-                                const GError *error,
-                                EShell *shell)
+memo_shell_backend_new_memo (ESource *source,
+                             GAsyncResult *result,
+                             EShell *shell,
+                             CompEditorFlags flags)
 {
+	ECal *cal;
 	ECalComponent *comp;
 	CompEditor *editor;
-	CompEditorFlags flags = 0;
 
 	/* XXX Handle errors better. */
-	if (error)
-		return;
-
-	flags |= COMP_EDITOR_NEW_ITEM;
+	cal = e_load_cal_source_finish (source, result, NULL);
+	g_return_if_fail (E_IS_CAL (cal));
 
 	comp = cal_comp_memo_new_with_defaults (cal);
 	cal_comp_update_time_by_active_window (comp, shell);
@@ -179,42 +178,45 @@ memo_shell_backend_memo_new_cb (ECal *cal,
 }
 
 static void
-memo_shell_backend_memo_shared_new_cb (ECal *cal,
-                                       const GError *error,
-                                       EShell *shell)
+memo_shell_backend_memo_new_cb (ESource *source,
+                                GAsyncResult *result,
+                                EShell *shell)
 {
-	ECalComponent *comp;
-	CompEditor *editor;
 	CompEditorFlags flags = 0;
 
-	/* XXX Handle errors better. */
-	if (error)
-		return;
+	flags |= COMP_EDITOR_NEW_ITEM;
+
+	memo_shell_backend_new_memo (source, result, shell, flags);
+
+	g_object_unref (shell);
+}
+
+static void
+memo_shell_backend_memo_shared_new_cb (ESource *source,
+                                       GAsyncResult *result,
+                                       EShell *shell)
+{
+	CompEditorFlags flags = 0;
 
 	flags |= COMP_EDITOR_NEW_ITEM;
 	flags |= COMP_EDITOR_IS_SHARED;
 	flags |= COMP_EDITOR_USER_ORG;
 
-	comp = cal_comp_memo_new_with_defaults (cal);
-	cal_comp_update_time_by_active_window (comp, shell);
-	editor = memo_editor_new (cal, shell, flags);
-	comp_editor_edit_comp (editor, comp);
-
-	gtk_window_present (GTK_WINDOW (editor));
+	memo_shell_backend_new_memo (source, result, shell, flags);
 
-	g_object_unref (comp);
-	g_object_unref (cal);
+	g_object_unref (shell);
 }
 
 static void
 action_memo_new_cb (GtkAction *action,
                     EShellWindow *shell_window)
 {
-	ECal *cal = NULL;
-	ECalSourceType source_type;
-	ESourceList *source_list;
-	EShellSettings *shell_settings;
 	EShell *shell;
+	EShellBackend *shell_backend;
+	EShellSettings *shell_settings;
+	ESource *source = NULL;
+	ESourceList *source_list;
+	ECalSourceType source_type;
 	const gchar *action_name;
 	gchar *uid;
 
@@ -224,43 +226,43 @@ action_memo_new_cb (GtkAction *action,
 
 	shell = e_shell_window_get_shell (shell_window);
 	shell_settings = e_shell_get_shell_settings (shell);
+	shell_backend = e_shell_get_backend_by_name (shell, "memos");
 
-	if (!e_cal_get_sources (&source_list, source_type, NULL)) {
-		g_warning ("Could not get memo sources from GConf!");
-		return;
-	}
+	g_object_get (shell_backend, "source-list", &source_list, NULL);
+	g_return_if_fail (E_IS_SOURCE_LIST (source_list));
 
 	uid = e_shell_settings_get_string (
 		shell_settings, "cal-primary-memo-list");
 
 	if (uid != NULL) {
-		ESource *source;
-
 		source = e_source_list_peek_source_by_uid (source_list, uid);
-		if (source != NULL)
-			cal = e_auth_new_cal_from_source (source, source_type);
 		g_free (uid);
 	}
 
-	if (cal == NULL)
-		cal = e_auth_new_cal_from_default (source_type);
+	if (source == NULL)
+		source = e_source_list_peek_default_source (source_list);
 
-	g_return_if_fail (cal != NULL);
+	g_return_if_fail (E_IS_SOURCE (source));
 
-	/* Connect the appropriate signal handler. */
+	/* Use a callback function appropriate for the action.
+	 * FIXME Need to obtain a better default time zone. */
 	action_name = gtk_action_get_name (action);
-	if (strcmp (action_name, "memo-shared-new") == 0)
-		g_signal_connect (
-			cal, "cal-opened-ex",
-			G_CALLBACK (memo_shell_backend_memo_shared_new_cb),
-			shell);
+	if (g_strcmp0 (action_name, "memo-shared-new") == 0)
+		e_load_cal_source_async (
+			source, source_type, NULL,
+			GTK_WINDOW (shell_window),
+			NULL, (GAsyncReadyCallback)
+			memo_shell_backend_memo_shared_new_cb,
+			g_object_ref (shell));
 	else
-		g_signal_connect (
-			cal, "cal-opened-ex",
-			G_CALLBACK (memo_shell_backend_memo_new_cb),
-			shell);
+		e_load_cal_source_async (
+			source, source_type, NULL,
+			GTK_WINDOW (shell_window),
+			NULL, (GAsyncReadyCallback)
+			memo_shell_backend_memo_new_cb,
+			g_object_ref (shell));
 
-	e_cal_open_async (cal, FALSE);
+	g_object_unref (source_list);
 }
 
 static void
diff --git a/modules/calendar/e-memo-shell-sidebar.c b/modules/calendar/e-memo-shell-sidebar.c
index 7b4b8f71b6..f463394fbd 100644
--- a/modules/calendar/e-memo-shell-sidebar.c
+++ b/modules/calendar/e-memo-shell-sidebar.c
@@ -54,6 +54,8 @@ struct _EMemoShellSidebarPrivate {
 	 * sometime later we update our default-client property
 	 * which is bound by an EBinding to ECalModel. */
 	ECal *default_client;
+
+	GCancellable *loading_default_client;
 };
 
 enum {
@@ -235,104 +237,106 @@ memo_shell_sidebar_client_opened_cb (EMemoShellSidebar *memo_shell_sidebar,
 }
 
 static void
-memo_shell_sidebar_default_opened_cb (EMemoShellSidebar *memo_shell_sidebar,
-                                      const GError *error,
-                                      ECal *client)
+memo_shell_sidebar_default_loaded_cb (ESource *source,
+                                      GAsyncResult *result,
+                                      EShellSidebar *shell_sidebar)
 {
+	EMemoShellSidebarPrivate *priv;
+	EShellWindow *shell_window;
 	EShellView *shell_view;
-	EShellSidebar *shell_sidebar;
+	ECal *client;
+	GError *error = NULL;
+
+	priv = E_MEMO_SHELL_SIDEBAR_GET_PRIVATE (shell_sidebar);
 
-	shell_sidebar = E_SHELL_SIDEBAR (memo_shell_sidebar);
 	shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
+	shell_window = e_shell_view_get_shell_window (shell_view);
 
-	if (g_error_matches (error, E_CALENDAR_ERROR,
-		E_CALENDAR_STATUS_AUTHENTICATION_FAILED) ||
-	    g_error_matches (error, E_CALENDAR_ERROR,
-		E_CALENDAR_STATUS_AUTHENTICATION_REQUIRED))
-		e_auth_cal_forget_password (client);
+	client = e_load_cal_source_finish (source, result, &error);
 
-	/* Handle errors. */
-	switch (error ? error->code : E_CALENDAR_STATUS_OK) {
-		case E_CALENDAR_STATUS_OK:
-			break;
+	if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
+		g_error_free (error);
+		goto exit;
 
-		case E_CALENDAR_STATUS_AUTHENTICATION_FAILED:
-			e_cal_open_async (client, FALSE);
-			return;
+	} else if (error != NULL) {
+		e_alert_run_dialog_for_args (
+			GTK_WINDOW (shell_window),
+			"calendar:failed-open-memos",
+			error->message, NULL);
+		g_error_free (error);
+		goto exit;
+	}
 
-		case E_CALENDAR_STATUS_BUSY:
-			return;
+	g_return_if_fail (E_IS_CAL (client));
 
-		default:
-			e_alert_run_dialog_for_args (
-				GTK_WINDOW (e_shell_view_get_shell_window (shell_view)),
-				"calendar:failed-open-memos",
-				error->message, NULL);
+	if (priv->default_client != NULL)
+		g_object_unref (priv->default_client);
 
-			e_memo_shell_sidebar_remove_source (
-				memo_shell_sidebar,
-				e_cal_get_source (client));
-			return;
-	}
+	priv->default_client = client;
 
-	g_assert (error == NULL);
+	g_object_notify (G_OBJECT (shell_sidebar), "default-client");
 
-	g_signal_handlers_disconnect_matched (
-		client, G_SIGNAL_MATCH_FUNC, 0, 0, NULL,
-		memo_shell_sidebar_default_opened_cb, NULL);
-
-	g_object_notify (G_OBJECT (memo_shell_sidebar), "default-client");
+exit:
+	g_object_unref (shell_sidebar);
 }
 
 static void
 memo_shell_sidebar_set_default (EMemoShellSidebar *memo_shell_sidebar,
                                 ESource *source)
 {
+	EMemoShellSidebarPrivate *priv;
 	EShellView *shell_view;
+	EShellWindow *shell_window;
 	EShellContent *shell_content;
 	EShellSidebar *shell_sidebar;
 	EMemoShellContent *memo_shell_content;
 	ECalSourceType source_type;
-	GHashTable *client_table;
 	ECalModel *model;
 	ECal *client;
 	icaltimezone *timezone;
 	const gchar *uid;
 
+	priv = memo_shell_sidebar->priv;
 	source_type = E_CAL_SOURCE_TYPE_JOURNAL;
-	client_table = memo_shell_sidebar->priv->client_table;
-
-	uid = e_source_peek_uid (source);
-	client = g_hash_table_lookup (client_table, uid);
-
-	if (memo_shell_sidebar->priv->default_client != NULL)
-		g_object_unref (memo_shell_sidebar->priv->default_client);
-
-	if (client != NULL)
-		g_object_ref (client);
-	else
-		client = e_auth_new_cal_from_source (source, source_type);
-
-	memo_shell_sidebar->priv->default_client = client;
-	g_return_if_fail (client != NULL);
-
-	g_signal_connect_swapped (
-		client, "cal-opened-ex",
-		G_CALLBACK (memo_shell_sidebar_default_opened_cb),
-		memo_shell_sidebar);
 
 	/* FIXME Sidebar should not be accessing the EShellContent.
 	 *       This probably needs to be moved to EMemoShellView. */
 	shell_sidebar = E_SHELL_SIDEBAR (memo_shell_sidebar);
 	shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
 	shell_content = e_shell_view_get_shell_content (shell_view);
+	shell_window = e_shell_view_get_shell_window (shell_view);
 
 	memo_shell_content = E_MEMO_SHELL_CONTENT (shell_content);
 	model = e_memo_shell_content_get_memo_model (memo_shell_content);
 	timezone = e_cal_model_get_timezone (model);
 
-	e_cal_set_default_timezone (client, timezone, NULL);
-	e_cal_open_async (client, FALSE);
+	/* Cancel any unfinished previous request. */
+	if (priv->loading_default_client != NULL) {
+		g_cancellable_cancel (priv->loading_default_client);
+		g_object_unref (priv->loading_default_client);
+		priv->loading_default_client = NULL;
+	}
+
+	uid = e_source_peek_uid (source);
+	client = g_hash_table_lookup (priv->client_table, uid);
+
+	/* If we already have an open connection for
+	 * this UID, we can finish immediately. */
+	if (client != NULL) {
+		if (priv->default_client != NULL)
+			g_object_unref (priv->default_client);
+		priv->default_client = g_object_ref (client);
+		g_object_notify (G_OBJECT (shell_sidebar), "default-client");
+		return;
+	}
+
+	priv->loading_default_client = g_cancellable_new ();
+
+	e_load_cal_source_async (
+		source, source_type, timezone,
+		GTK_WINDOW (shell_window), priv->loading_default_client,
+		(GAsyncReadyCallback) memo_shell_sidebar_default_loaded_cb,
+		g_object_ref (shell_sidebar));
 }
 
 static void
@@ -538,6 +542,12 @@ memo_shell_sidebar_dispose (GObject *object)
 		priv->default_client = NULL;
 	}
 
+	if (priv->loading_default_client != NULL) {
+		g_cancellable_cancel (priv->loading_default_client);
+		g_object_unref (priv->loading_default_client);
+		priv->loading_default_client = NULL;
+	}
+
 	g_hash_table_remove_all (priv->client_table);
 
 	/* Chain up to parent's dispose() method. */
diff --git a/modules/calendar/e-task-shell-backend.c b/modules/calendar/e-task-shell-backend.c
index cdd4dcc608..be085afa8d 100644
--- a/modules/calendar/e-task-shell-backend.c
+++ b/modules/calendar/e-task-shell-backend.c
@@ -153,19 +153,18 @@ task_shell_backend_ensure_sources (EShellBackend *shell_backend)
 }
 
 static void
-task_shell_backend_task_new_cb (ECal *cal,
-                                const GError *error,
-                                EShell *shell)
+task_shell_backend_new_task (ESource *source,
+                             GAsyncResult *result,
+                             EShell *shell,
+                             CompEditorFlags flags)
 {
+	ECal *cal;
 	ECalComponent *comp;
 	CompEditor *editor;
-	CompEditorFlags flags = 0;
 
 	/* XXX Handle errors better. */
-	if (error)
-		return;
-
-	flags |= COMP_EDITOR_NEW_ITEM;
+	cal = e_load_cal_source_finish (source, result, NULL);
+	g_return_if_fail (E_IS_CAL (cal));
 
 	editor = task_editor_new (cal, shell, flags);
 	comp = cal_comp_task_new_with_defaults (cal);
@@ -178,41 +177,45 @@ task_shell_backend_task_new_cb (ECal *cal,
 }
 
 static void
-task_shell_backend_task_assigned_new_cb (ECal *cal,
-                                         const GError *error,
-                                         EShell *shell)
+task_shell_backend_task_new_cb (ESource *source,
+                                GAsyncResult *result,
+                                EShell *shell)
 {
-	ECalComponent *comp;
-	CompEditor *editor;
 	CompEditorFlags flags = 0;
 
-	/* XXX Handle errors better. */
-	if (error)
-		return;
+	flags |= COMP_EDITOR_NEW_ITEM;
+
+	task_shell_backend_new_task (source, result, shell, flags);
+
+	g_object_unref (shell);
+}
+
+static void
+task_shell_backend_task_assigned_new_cb (ESource *source,
+                                         GAsyncResult *result,
+                                         EShell *shell)
+{
+	CompEditorFlags flags = 0;
 
 	flags |= COMP_EDITOR_NEW_ITEM;
 	flags |= COMP_EDITOR_IS_ASSIGNED;
 	flags |= COMP_EDITOR_USER_ORG;
 
-	editor = task_editor_new (cal, shell, flags);
-	comp = cal_comp_task_new_with_defaults (cal);
-	comp_editor_edit_comp (editor, comp);
+	task_shell_backend_new_task (source, result, shell, flags);
 
-	gtk_window_present (GTK_WINDOW (editor));
-
-	g_object_unref (comp);
-	g_object_unref (cal);
+	g_object_unref (shell);
 }
 
 static void
 action_task_new_cb (GtkAction *action,
                     EShellWindow *shell_window)
 {
-	ECal *cal = NULL;
-	ECalSourceType source_type;
-	ESourceList *source_list;
-	EShellSettings *shell_settings;
 	EShell *shell;
+	EShellBackend *shell_backend;
+	EShellSettings *shell_settings;
+	ESource *source = NULL;
+	ESourceList *source_list;
+	ECalSourceType source_type;
 	const gchar *action_name;
 	gchar *uid;
 
@@ -222,43 +225,43 @@ action_task_new_cb (GtkAction *action,
 
 	shell = e_shell_window_get_shell (shell_window);
 	shell_settings = e_shell_get_shell_settings (shell);
+	shell_backend = e_shell_get_backend_by_name (shell, "tasks");
 
-	if (!e_cal_get_sources (&source_list, source_type, NULL)) {
-		g_warning ("Could not get task sources from GConf!");
-		return;
-	}
+	g_object_get (shell_backend, "source-list", &source_list, NULL);
+	g_return_if_fail (E_IS_SOURCE_LIST (source_list));
 
 	uid = e_shell_settings_get_string (
 		shell_settings, "cal-primary-task-list");
 
 	if (uid != NULL) {
-		ESource *source;
-
 		source = e_source_list_peek_source_by_uid (source_list, uid);
-		if (source != NULL)
-			cal = e_auth_new_cal_from_source (source, source_type);
 		g_free (uid);
 	}
 
-	if (cal == NULL)
-		cal = e_auth_new_cal_from_default (source_type);
+	if (source == NULL)
+		source = e_source_list_peek_default_source (source_list);
 
-	g_return_if_fail (cal != NULL);
+	g_return_if_fail (E_IS_SOURCE (source));
 
-	/* Connect the appropriate signal handler. */
+	/* Use a callback function appropriate for the action.
+	 * FIXME Need to obtain a better default time zone. */
 	action_name = gtk_action_get_name (action);
 	if (strcmp (action_name, "task-assigned-new") == 0)
-		g_signal_connect (
-			cal, "cal-opened-ex",
-			G_CALLBACK (task_shell_backend_task_assigned_new_cb),
-			shell);
+		e_load_cal_source_async (
+			source, source_type, NULL,
+			GTK_WINDOW (shell_window),
+			NULL, (GAsyncReadyCallback)
+			task_shell_backend_task_assigned_new_cb,
+			g_object_ref (shell));
 	else
-		g_signal_connect (
-			cal, "cal-opened-ex",
-			G_CALLBACK (task_shell_backend_task_new_cb),
-			shell);
+		e_load_cal_source_async (
+			source, source_type, NULL,
+			GTK_WINDOW (shell_window),
+			NULL, (GAsyncReadyCallback)
+			task_shell_backend_task_new_cb,
+			g_object_ref (shell));
 
-	e_cal_open_async (cal, FALSE);
+	g_object_unref (source_list);
 }
 
 static void
diff --git a/modules/calendar/e-task-shell-sidebar.c b/modules/calendar/e-task-shell-sidebar.c
index 8613b4eb0f..b50e463e8a 100644
--- a/modules/calendar/e-task-shell-sidebar.c
+++ b/modules/calendar/e-task-shell-sidebar.c
@@ -54,6 +54,8 @@ struct _ETaskShellSidebarPrivate {
 	 * sometime later we update our default-client property
 	 * which is bound by an EBinding to ECalModel. */
 	ECal *default_client;
+
+	GCancellable *loading_default_client;
 };
 
 enum {
@@ -235,104 +237,106 @@ task_shell_sidebar_client_opened_cb (ETaskShellSidebar *task_shell_sidebar,
 }
 
 static void
-task_shell_sidebar_default_opened_cb (ETaskShellSidebar *task_shell_sidebar,
-                                      const GError *error,
-                                      ECal *client)
+task_shell_sidebar_default_loaded_cb (ESource *source,
+                                      GAsyncResult *result,
+                                      EShellSidebar *shell_sidebar)
 {
+	ETaskShellSidebarPrivate *priv;
+	EShellWindow *shell_window;
 	EShellView *shell_view;
-	EShellSidebar *shell_sidebar;
+	ECal *client;
+	GError *error = NULL;
+
+	priv = E_TASK_SHELL_SIDEBAR_GET_PRIVATE (shell_sidebar);
 
-	shell_sidebar = E_SHELL_SIDEBAR (task_shell_sidebar);
 	shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
+	shell_window = e_shell_view_get_shell_window (shell_view);
 
-	if (g_error_matches (error, E_CALENDAR_ERROR,
-		E_CALENDAR_STATUS_AUTHENTICATION_FAILED) ||
-	    g_error_matches (error, E_CALENDAR_ERROR,
-		E_CALENDAR_STATUS_AUTHENTICATION_REQUIRED))
-		e_auth_cal_forget_password (client);
+	client = e_load_cal_source_finish (source, result, &error);
 
-	/* Handle errors. */
-	switch (error ? error->code : E_CALENDAR_STATUS_OK) {
-		case E_CALENDAR_STATUS_OK:
-			break;
+	if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
+		g_error_free (error);
+		goto exit;
 
-		case E_CALENDAR_STATUS_AUTHENTICATION_FAILED:
-			e_cal_open_async (client, FALSE);
-			return;
+	} else if (error != NULL) {
+		e_alert_run_dialog_for_args (
+			GTK_WINDOW (shell_window),
+			"calendar:failed-open-tasks",
+			error->message, NULL);
+		g_error_free (error);
+		goto exit;
+	}
 
-		case E_CALENDAR_STATUS_BUSY:
-			return;
+	g_return_if_fail (E_IS_CAL (client));
 
-		default:
-			e_alert_run_dialog_for_args (
-				GTK_WINDOW (e_shell_view_get_shell_window (shell_view)),
-				"calendar:failed-open-tasks",
-				error->message, NULL);
+	if (priv->default_client != NULL)
+		g_object_unref (priv->default_client);
 
-			e_task_shell_sidebar_remove_source (
-				task_shell_sidebar,
-				e_cal_get_source (client));
-			return;
-	}
+	priv->default_client = client;
 
-	g_assert (error == NULL);
+	g_object_notify (G_OBJECT (shell_sidebar), "default-client");
 
-	g_signal_handlers_disconnect_matched (
-		client, G_SIGNAL_MATCH_FUNC, 0, 0, NULL,
-		task_shell_sidebar_default_opened_cb, NULL);
-
-	g_object_notify (G_OBJECT (task_shell_sidebar), "default-client");
+exit:
+	g_object_unref (shell_sidebar);
 }
 
 static void
 task_shell_sidebar_set_default (ETaskShellSidebar *task_shell_sidebar,
                                 ESource *source)
 {
+	ETaskShellSidebarPrivate *priv;
 	EShellView *shell_view;
+	EShellWindow *shell_window;
 	EShellContent *shell_content;
 	EShellSidebar *shell_sidebar;
 	ETaskShellContent *task_shell_content;
 	ECalSourceType source_type;
-	GHashTable *client_table;
 	ECalModel *model;
 	ECal *client;
 	icaltimezone *timezone;
 	const gchar *uid;
 
+	priv = task_shell_sidebar->priv;
 	source_type = E_CAL_SOURCE_TYPE_TODO;
-	client_table = task_shell_sidebar->priv->client_table;
-
-	uid = e_source_peek_uid (source);
-	client = g_hash_table_lookup (client_table, uid);
-
-	if (task_shell_sidebar->priv->default_client != NULL)
-		g_object_unref (task_shell_sidebar->priv->default_client);
-
-	if (client != NULL)
-		g_object_ref (client);
-	else
-		client = e_auth_new_cal_from_source (source, source_type);
-
-	task_shell_sidebar->priv->default_client = client;
-	g_return_if_fail (client != NULL);
-
-	g_signal_connect_swapped (
-		client, "cal-opened-ex",
-		G_CALLBACK (task_shell_sidebar_default_opened_cb),
-		task_shell_sidebar);
 
 	/* FIXME Sidebar should not be accessing the EShellContent.
 	 *       This probably needs to be moved to ETaskShellView. */
 	shell_sidebar = E_SHELL_SIDEBAR (task_shell_sidebar);
 	shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
 	shell_content = e_shell_view_get_shell_content (shell_view);
+	shell_window = e_shell_view_get_shell_window (shell_view);
 
 	task_shell_content = E_TASK_SHELL_CONTENT (shell_content);
 	model = e_task_shell_content_get_task_model (task_shell_content);
 	timezone = e_cal_model_get_timezone (model);
 
-	e_cal_set_default_timezone (client, timezone, NULL);
-	e_cal_open_async (client, FALSE);
+	/* Cancel any unfinished previous request. */
+	if (priv->loading_default_client != NULL) {
+		g_cancellable_cancel (priv->loading_default_client);
+		g_object_unref (priv->loading_default_client);
+		priv->loading_default_client = NULL;
+	}
+
+	uid = e_source_peek_uid (source);
+	client = g_hash_table_lookup (priv->client_table, uid);
+
+	/* If we already have an open connection for
+	 * this UID, we can finish immediately. */
+	if (client != NULL) {
+		if (priv->default_client != NULL)
+			g_object_unref (priv->default_client);
+		priv->default_client = g_object_ref (client);
+		g_object_notify (G_OBJECT (shell_sidebar), "default-client");
+		return;
+	}
+
+	priv->loading_default_client = g_cancellable_new ();
+
+	e_load_cal_source_async (
+		source, source_type, timezone,
+		GTK_WINDOW (shell_window), priv->loading_default_client,
+		(GAsyncReadyCallback) task_shell_sidebar_default_loaded_cb,
+		g_object_ref (shell_sidebar));
 }
 
 static void
@@ -538,6 +542,12 @@ task_shell_sidebar_dispose (GObject *object)
 		priv->default_client = NULL;
 	}
 
+	if (priv->loading_default_client != NULL) {
+		g_cancellable_cancel (priv->loading_default_client);
+		g_object_unref (priv->loading_default_client);
+		priv->loading_default_client = NULL;
+	}
+
 	g_hash_table_remove_all (priv->client_table);
 
 	/* Chain up to parent's dispose() method. */