261 lines
10 KiB
Python
261 lines
10 KiB
Python
# Copyright 2014 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import contextlib
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import datetime
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import mock
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from oslo.utils import timeutils
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import testscenarios
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from neutron.common import constants
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from neutron.common import topics
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from neutron import context
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from neutron.db import agents_db
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from neutron.db import agentschedulers_db as sched_db
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from neutron.db import models_v2
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from neutron.scheduler import dhcp_agent_scheduler
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from neutron.tests.unit import testlib_api
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# Required to generate tests from scenarios. Not compatible with nose.
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load_tests = testscenarios.load_tests_apply_scenarios
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class TestDhcpSchedulerBaseTestCase(testlib_api.SqlTestCase):
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def setUp(self):
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super(TestDhcpSchedulerBaseTestCase, self).setUp()
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self.ctx = context.get_admin_context()
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self.network = {'id': 'foo_network_id'}
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self.network_id = 'foo_network_id'
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self._save_networks([self.network_id])
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def _get_agents(self, hosts):
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return [
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agents_db.Agent(
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binary='neutron-dhcp-agent',
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host=host,
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topic=topics.DHCP_AGENT,
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configurations="",
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agent_type=constants.AGENT_TYPE_DHCP,
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created_at=timeutils.utcnow(),
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started_at=timeutils.utcnow(),
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heartbeat_timestamp=timeutils.utcnow())
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for host in hosts
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]
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def _save_agents(self, agents):
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for agent in agents:
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with self.ctx.session.begin(subtransactions=True):
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self.ctx.session.add(agent)
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def _create_and_set_agents_down(self, hosts, down_agent_count=0):
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dhcp_agents = self._get_agents(hosts)
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# bring down the specified agents
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for agent in dhcp_agents[:down_agent_count]:
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old_time = agent['heartbeat_timestamp']
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hour_old = old_time - datetime.timedelta(hours=1)
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agent['heartbeat_timestamp'] = hour_old
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agent['started_at'] = hour_old
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self._save_agents(dhcp_agents)
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return dhcp_agents
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def _save_networks(self, networks):
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for network_id in networks:
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with self.ctx.session.begin(subtransactions=True):
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self.ctx.session.add(models_v2.Network(id=network_id))
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def _test_schedule_bind_network(self, agents, network_id):
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scheduler = dhcp_agent_scheduler.ChanceScheduler()
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scheduler._schedule_bind_network(self.ctx, agents, network_id)
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results = self.ctx.session.query(
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sched_db.NetworkDhcpAgentBinding).filter_by(
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network_id=network_id).all()
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self.assertEqual(len(agents), len(results))
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for result in results:
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self.assertEqual(network_id, result.network_id)
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class TestDhcpScheduler(TestDhcpSchedulerBaseTestCase):
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def test_schedule_bind_network_single_agent(self):
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agents = self._create_and_set_agents_down(['host-a'])
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self._test_schedule_bind_network(agents, self.network_id)
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def test_schedule_bind_network_multi_agents(self):
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agents = self._create_and_set_agents_down(['host-a', 'host-b'])
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self._test_schedule_bind_network(agents, self.network_id)
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def test_schedule_bind_network_multi_agent_fail_one(self):
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agents = self._create_and_set_agents_down(['host-a'])
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self._test_schedule_bind_network(agents, self.network_id)
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with mock.patch.object(dhcp_agent_scheduler.LOG, 'info') as fake_log:
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self._test_schedule_bind_network(agents, self.network_id)
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self.assertEqual(1, fake_log.call_count)
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class TestAutoScheduleNetworks(TestDhcpSchedulerBaseTestCase):
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"""Unit test scenarios for ChanceScheduler.auto_schedule_networks.
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network_present
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Network is present or not
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enable_dhcp
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Dhcp is enabled or disabled in the subnet of the network
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scheduled_already
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Network is already scheduled to the agent or not
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agent_down
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Dhcp agent is down or alive
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valid_host
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If true, then an valid host is passed to schedule the network,
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else an invalid host is passed.
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"""
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scenarios = [
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('Network present',
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dict(network_present=True,
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enable_dhcp=True,
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scheduled_already=False,
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agent_down=False,
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valid_host=True)),
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('No network',
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dict(network_present=False,
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enable_dhcp=False,
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scheduled_already=False,
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agent_down=False,
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valid_host=True)),
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('Network already scheduled',
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dict(network_present=True,
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enable_dhcp=True,
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scheduled_already=True,
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agent_down=False,
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valid_host=True)),
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('Agent down',
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dict(network_present=True,
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enable_dhcp=True,
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scheduled_already=False,
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agent_down=False,
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valid_host=True)),
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('dhcp disabled',
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dict(network_present=True,
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enable_dhcp=False,
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scheduled_already=False,
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agent_down=False,
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valid_host=False)),
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('Invalid host',
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dict(network_present=True,
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enable_dhcp=True,
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scheduled_already=False,
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agent_down=False,
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valid_host=False)),
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]
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def test_auto_schedule_network(self):
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plugin = mock.MagicMock()
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plugin.get_subnets.return_value = (
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[{"network_id": self.network_id, "enable_dhcp": self.enable_dhcp}]
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if self.network_present else [])
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scheduler = dhcp_agent_scheduler.ChanceScheduler()
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if self.network_present:
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down_agent_count = 1 if self.agent_down else 0
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agents = self._create_and_set_agents_down(
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['host-a'], down_agent_count=down_agent_count)
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if self.scheduled_already:
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self._test_schedule_bind_network(agents, self.network_id)
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expected_result = (self.network_present and self.enable_dhcp)
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expected_hosted_agents = (1 if expected_result and
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self.valid_host else 0)
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host = "host-a" if self.valid_host else "host-b"
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observed_ret_value = scheduler.auto_schedule_networks(
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plugin, self.ctx, host)
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self.assertEqual(expected_result, observed_ret_value)
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hosted_agents = self.ctx.session.query(
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sched_db.NetworkDhcpAgentBinding).all()
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self.assertEqual(expected_hosted_agents, len(hosted_agents))
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class TestNetworksFailover(TestDhcpSchedulerBaseTestCase,
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sched_db.DhcpAgentSchedulerDbMixin):
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def test_reschedule_network_from_down_agent(self):
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plugin = mock.MagicMock()
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plugin.get_subnets.return_value = [{"network_id": self.network_id,
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"enable_dhcp": True}]
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agents = self._create_and_set_agents_down(['host-a', 'host-b'], 1)
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self._test_schedule_bind_network([agents[0]], self.network_id)
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self._save_networks(["foo-network-2"])
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self._test_schedule_bind_network([agents[1]], "foo-network-2")
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with contextlib.nested(
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mock.patch.object(self, 'remove_network_from_dhcp_agent'),
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mock.patch.object(self, 'schedule_network',
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return_value=[agents[1]]),
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mock.patch.object(self, 'get_network', create=True,
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return_value={'id': self.network_id})
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) as (rn, sch, getn):
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notifier = mock.MagicMock()
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self.agent_notifiers[constants.AGENT_TYPE_DHCP] = notifier
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self.remove_networks_from_down_agents()
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rn.assert_called_with(mock.ANY, agents[0].id, self.network_id)
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sch.assert_called_with(mock.ANY, {'id': self.network_id})
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notifier.network_added_to_agent.assert_called_with(
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mock.ANY, self.network_id, agents[1].host)
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def test_reschedule_network_from_down_agent_failed(self):
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plugin = mock.MagicMock()
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plugin.get_subnets.return_value = [{"network_id": self.network_id,
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"enable_dhcp": True}]
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agents = self._create_and_set_agents_down(['host-a'], 1)
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self._test_schedule_bind_network([agents[0]], self.network_id)
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with contextlib.nested(
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mock.patch.object(self, 'remove_network_from_dhcp_agent'),
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mock.patch.object(self, 'schedule_network',
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return_value=None),
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mock.patch.object(self, 'get_network', create=True,
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return_value={'id': self.network_id})
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) as (rn, sch, getn):
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notifier = mock.MagicMock()
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self.agent_notifiers[constants.AGENT_TYPE_DHCP] = notifier
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self.remove_networks_from_down_agents()
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rn.assert_called_with(mock.ANY, agents[0].id, self.network_id)
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sch.assert_called_with(mock.ANY, {'id': self.network_id})
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self.assertFalse(notifier.network_added_to_agent.called)
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def test_filter_bindings(self):
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bindings = [
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sched_db.NetworkDhcpAgentBinding(network_id='foo1',
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dhcp_agent={'id': 'id1'}),
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sched_db.NetworkDhcpAgentBinding(network_id='foo2',
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dhcp_agent={'id': 'id1'}),
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sched_db.NetworkDhcpAgentBinding(network_id='foo3',
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dhcp_agent={'id': 'id2'}),
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sched_db.NetworkDhcpAgentBinding(network_id='foo4',
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dhcp_agent={'id': 'id2'})]
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with mock.patch.object(self, '_agent_starting_up',
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side_effect=[True, False]):
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res = [b for b in self._filter_bindings(None, bindings)]
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# once per each agent id1 and id2
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self.assertEqual(2, len(res))
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res_ids = [b.network_id for b in res]
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self.assertIn('foo3', res_ids)
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self.assertIn('foo4', res_ids)
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