neutron/neutron/tests/unit/ml2/test_helpers.py

# Copyright (c) 2014 Thales Services SAS
# 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 fixtures
import logging
import mock
from sqlalchemy.orm import query

from neutron.common import exceptions as exc
import neutron.db.api as db
from neutron.plugins.ml2.drivers import helpers
from neutron.plugins.ml2.drivers import type_vlan
from neutron.tests import base


TENANT_NET = 'phys_net2'
VLAN_MIN = 200
VLAN_MAX = 209
VLAN_OUTSIDE = 100
NETWORK_VLAN_RANGES = {
    TENANT_NET: [(VLAN_MIN, VLAN_MAX)],
}


class HelpersTest(base.BaseTestCase):

    def setUp(self):
        super(HelpersTest, self).setUp()
        db.configure_db()
        self.driver = type_vlan.VlanTypeDriver()
        self.driver.network_vlan_ranges = NETWORK_VLAN_RANGES
        self.driver._sync_vlan_allocations()
        self.session = db.get_session()
        self.addCleanup(db.clear_db)
        self.useFixture(
            fixtures.FakeLogger(
                name=helpers.__name__,
                format=base.LOG_FORMAT,
                level=logging.DEBUG
            ))

    def check_raw_segment(self, expected, observed):
        for key, value in expected.items():
            self.assertEqual(value, observed[key])

    def test_primary_keys(self):
        self.assertEqual(set(['physical_network', 'vlan_id']),
                         self.driver.primary_keys)

    def test_allocate_specific_unallocated_segment_in_pools(self):
        expected = dict(physical_network=TENANT_NET, vlan_id=VLAN_MIN)
        observed = self.driver.allocate_fully_specified_segment(self.session,
                                                                **expected)
        self.check_raw_segment(expected, observed)

    def test_allocate_specific_allocated_segment_in_pools(self):
        raw_segment = dict(physical_network=TENANT_NET, vlan_id=VLAN_MIN)
        self.driver.allocate_fully_specified_segment(self.session,
                                                     **raw_segment)
        observed = self.driver.allocate_fully_specified_segment(self.session,
                                                                **raw_segment)
        self.assertIsNone(observed)

    def test_allocate_specific_finally_allocated_segment_in_pools(self):
        # Test case: allocate a specific unallocated segment in pools but
        # the segment is allocated concurrently between select and update

        raw_segment = dict(physical_network=TENANT_NET, vlan_id=VLAN_MIN)
        with mock.patch.object(query.Query, 'update', return_value=0):
            observed = self.driver.allocate_fully_specified_segment(
                self.session, **raw_segment)
            self.assertIsNone(observed)

    def test_allocate_specific_unallocated_segment_outside_pools(self):
        expected = dict(physical_network=TENANT_NET, vlan_id=VLAN_OUTSIDE)
        observed = self.driver.allocate_fully_specified_segment(self.session,
                                                                **expected)
        self.check_raw_segment(expected, observed)

    def test_allocate_specific_allocated_segment_outside_pools(self):
        raw_segment = dict(physical_network=TENANT_NET, vlan_id=VLAN_OUTSIDE)
        self.driver.allocate_fully_specified_segment(self.session,
                                                     **raw_segment)
        observed = self.driver.allocate_fully_specified_segment(self.session,
                                                                **raw_segment)
        self.assertIsNone(observed)

    def test_allocate_specific_finally_unallocated_segment_outside_pools(self):
        # Test case: allocate a specific allocated segment in pools but
        # the segment is concurrently unallocated after select or update

        expected = dict(physical_network=TENANT_NET, vlan_id=VLAN_MIN)
        with mock.patch.object(self.driver.model, 'save'):
            observed = self.driver.allocate_fully_specified_segment(
                self.session, **expected)
            self.check_raw_segment(expected, observed)

    def test_allocate_partial_segment_without_filters(self):
        expected = dict(physical_network=TENANT_NET)
        observed = self.driver.allocate_partially_specified_segment(
            self.session)
        self.check_raw_segment(expected, observed)

    def test_allocate_partial_segment_with_filter(self):
        expected = dict(physical_network=TENANT_NET)
        observed = self.driver.allocate_partially_specified_segment(
            self.session, **expected)
        self.check_raw_segment(expected, observed)

    def test_allocate_partial_segment_no_resource_available(self):
        for i in range(VLAN_MIN, VLAN_MAX + 1):
            self.driver.allocate_partially_specified_segment(self.session)
        observed = self.driver.allocate_partially_specified_segment(
            self.session)
        self.assertIsNone(observed)

    def test_allocate_partial_segment_outside_pools(self):
        raw_segment = dict(physical_network='other_phys_net')
        observed = self.driver.allocate_partially_specified_segment(
            self.session, **raw_segment)
        self.assertIsNone(observed)

    def test_allocate_partial_segment_first_attempt_fails(self):
        expected = dict(physical_network=TENANT_NET)
        with mock.patch.object(query.Query, 'update', side_effect=[0, 1]):
            observed = self.driver.allocate_partially_specified_segment(
                self.session, **expected)
            self.check_raw_segment(expected, observed)

    def test_allocate_partial_segment_all_attempts_fail(self):
        with mock.patch.object(query.Query, 'update', return_value=0):
            with mock.patch.object(helpers.LOG, 'warning') as log_warning:
                self.assertRaises(
                    exc.NoNetworkFoundInMaximumAllowedAttempts,
                    self.driver.allocate_partially_specified_segment,
                    self.session)
                log_warning.assert_called_once_with(mock.ANY, mock.ANY)