# Copyright (c) 2014 VMware.
#
# 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.

from neutron.tests import base

from vmware_nsx.plugins.nsx_v.vshield.common import exceptions
from vmware_nsx.plugins.nsx_v.vshield import vcns


def raise_until_attempt(attempt, exception):
    def raises_until():
        if raises_until.current_attempt < attempt:
            raises_until.current_attempt += 1
            raise exception
        else:
            return raises_until.current_attempt
    raises_until.current_attempt = 1
    return raises_until


class TestMisc(base.BaseTestCase):
    def test_retry_on_exception_one_attempt(self):
        success_on_first_attempt = raise_until_attempt(
            1, exceptions.RequestBad(uri='', response=''))
        should_return_one = vcns.retry_upon_exception(
            exceptions.RequestBad, max_attempts=1)(success_on_first_attempt)
        self.assertEqual(1, should_return_one())

    def test_retry_on_exception_five_attempts(self):
        success_on_fifth_attempt = raise_until_attempt(
            5, exceptions.RequestBad(uri='', response=''))
        should_return_five = vcns.retry_upon_exception(
            exceptions.RequestBad, max_attempts=10)(success_on_fifth_attempt)
        self.assertEqual(5, should_return_five())

    def test_retry_on_exception_exceed_attempts(self):
        success_on_fifth_attempt = raise_until_attempt(
            5, exceptions.RequestBad(uri='', response=''))
        should_raise = vcns.retry_upon_exception(
            exceptions.RequestBad, max_attempts=4)(success_on_fifth_attempt)
        self.assertRaises(exceptions.RequestBad, should_raise)