# Copyright 2015 Brocade Communications System, Inc.
# 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 collections
from eventlet import greenthread


RouteRule = collections.namedtuple('RouteRule', 'dest_cidr, next_hop')


def retry(fn, args=None, kwargs=None, exceptions=None, limit=1, delay=0):
    args = args or []
    kwargs = kwargs or {}

    while limit > 0:
        try:
            return fn(*args, **kwargs)
        except Exception as e:
            if not exceptions or not isinstance(e, exceptions):
                raise
        if delay:
            greenthread.sleep(delay)
        limit -= 1
    raise
