helpers.py 文件源码

def catch_exceptions(func):
    """
    Catches and simplifies expected errors thrown by sceptre.

    catch_exceptions should be used as a decorator.

    :param func: The function which may throw exceptions which should be
        simplified.
    :type func: func
    :returns: The decorated function.
    :rtype: func
    """
    @wraps(func)
    def decorated(*args, **kwargs):
        """
        Invokes ``func``, catches expected errors, prints the error message and
        exits sceptre with a non-zero exit code.
        """
        try:
            return func(*args, **kwargs)
        except (SceptreException, BotoCoreError, ClientError, Boto3Error,
                TemplateError) as error:
            write(error)
            sys.exit(1)

    return decorated