task.py

class TaskImage(command.Lister):
    _description = _("Retrieve a listing of Task objects.")

    def get_parser(self, prog_name):
        parser = super(TaskImage, self).get_parser(prog_name)

        parser.add_argument(
            '--sort-key',
            metavar="<key>[:<direction>]",
            default='name:asc',
            help=_("Sort output by selected keys and directions(asc or desc) "
                   "(default: name:asc), multiple keys and directions can be "
                   "specified separated by comma"),
        )

        parser.add_argument(
            "--page-size",
            metavar="<size>",
            help=argparse.SUPPRESS,
        )

        parser.add_argument(
            '--type',
            metavar='<type>',
            choices=[
                'import', 'export', 'clone'
            ],
            help=_('Filter tasks by type'),
        )

        parser.add_argument(
            '--status',
            metavar='<status>',
            choices=[
                "pending", "processing", "success", "failure"
            ],
            default=None,
            help=_("Filter tasks based on status.")
        )

        return parser

    def take_action(self, parsed_args):
        image_client = self.app.client_manager.image

        columns = (
            "id",
            "type",
            "status",
            "owner_id"
        )
        column_headers = (
            "ID",
            "Type",
            "Status",
            "Owner"
        )

        data = image_client.tasks()

        return (
            column_headers,
            (utils.get_item_properties(
                s,
                columns,
                formatters=_formatters,
            ) for s in data)
        )