# Copyright (c) 2015 Hewlett Packard. All rights reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.
#

import retrying


@retrying.retry(stop_max_attempt_number=20, wait_fixed=1000)
def retry_check_function_return_value(f, expected_value, error_msg=None):
    """Check if function f returns expected value."""
    if not error_msg:
        error_msg = 'Expected value "%s" not found' % expected_value
    r = f()
    if r != expected_value:
        raise Exception(error_msg)