ironic-python-agent/ironic_python_agent/tests/agent.py

# Copyright 2013 Rackspace, Inc.
#
# 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 json
import time

import mock
from oslotest import base as test_base
import pkg_resources
import six
from wsgiref import simple_server

from ironic_python_agent import agent
from ironic_python_agent import base
from ironic_python_agent.cmd import agent as agent_cmd
from ironic_python_agent import encoding
from ironic_python_agent import errors
from ironic_python_agent import hardware

EXPECTED_ERROR = RuntimeError('command execution failed')

if six.PY2:
    OPEN_FUNCTION_NAME = '__builtin__.open'
else:
    OPEN_FUNCTION_NAME = 'builtins.open'


def foo_execute(*args, **kwargs):
    if kwargs['fail']:
        raise EXPECTED_ERROR
    else:
        return 'command execution succeeded'


class FakeExtension(base.BaseAgentExtension):
    def __init__(self):
        super(FakeExtension, self).__init__('FAKE')


class TestHeartbeater(test_base.BaseTestCase):
    def setUp(self):
        super(TestHeartbeater, self).setUp()
        self.mock_agent = mock.Mock()
        self.heartbeater = agent.IronicPythonAgentHeartbeater(self.mock_agent)
        self.heartbeater.api = mock.Mock()
        self.heartbeater.hardware = mock.create_autospec(
            hardware.HardwareManager)
        self.heartbeater.stop_event = mock.Mock()

    @mock.patch('ironic_python_agent.agent._time')
    @mock.patch('random.uniform')
    def test_heartbeat(self, mocked_uniform, mocked_time):
        time_responses = []
        uniform_responses = []
        heartbeat_responses = []
        wait_responses = []
        expected_stop_event_calls = []

        # FIRST RUN:
        # initial delay is 0
        expected_stop_event_calls.append(mock.call(0))
        wait_responses.append(False)
        # next heartbeat due at t=100
        heartbeat_responses.append(100)
        # random interval multiplier is 0.5
        uniform_responses.append(0.5)
        # time is now 50
        time_responses.append(50)

        # SECOND RUN:
        # 50 * .5 = 25
        expected_stop_event_calls.append(mock.call(25.0))
        wait_responses.append(False)
        # next heartbeat due at t=180
        heartbeat_responses.append(180)
        # random interval multiplier is 0.4
        uniform_responses.append(0.4)
        # time is now 80
        time_responses.append(80)

        # THIRD RUN:
        # 50 * .4 = 20
        expected_stop_event_calls.append(mock.call(20.0))
        wait_responses.append(False)
        # this heartbeat attempt fails
        heartbeat_responses.append(Exception('uh oh!'))
        # we check the time to generate a fake deadline, now t=125
        time_responses.append(125)
        # random interval multiplier is 0.5
        uniform_responses.append(0.5)
        # time is now 125.5
        time_responses.append(125.5)

        # FOURTH RUN:
        # 50 * .5 = 25
        expected_stop_event_calls.append(mock.call(25))
        # Stop now
        wait_responses.append(True)

        # Hook it up and run it
        mocked_time.side_effect = time_responses
        mocked_uniform.side_effect = uniform_responses
        self.mock_agent.heartbeat_timeout = 50
        self.heartbeater.api.heartbeat.side_effect = heartbeat_responses
        self.heartbeater.stop_event.wait.side_effect = wait_responses
        self.heartbeater.run()

        # Validate expectations
        self.assertEqual(expected_stop_event_calls,
                         self.heartbeater.stop_event.wait.call_args_list)
        self.assertEqual(self.heartbeater.error_delay, 2.7)


class TestBaseAgent(test_base.BaseTestCase):
    def setUp(self):
        super(TestBaseAgent, self).setUp()
        self.encoder = encoding.RESTJSONEncoder(indent=4)
        self.agent = agent.IronicPythonAgent('https://fake_api.example.'
                                             'org:8081/',
                                             ('203.0.113.1', 9990),
                                             ('192.0.2.1', 9999),
                                             lookup_timeout=300,
                                             lookup_interval=1)

    def assertEqualEncoded(self, a, b):
        # Evidently JSONEncoder.default() can't handle None (??) so we have to
        # use encode() to generate JSON, then json.loads() to get back a python
        # object.
        a_encoded = self.encoder.encode(a)
        b_encoded = self.encoder.encode(b)
        self.assertEqual(json.loads(a_encoded), json.loads(b_encoded))

    def test_get_status(self):
        started_at = time.time()
        self.agent.started_at = started_at

        status = self.agent.get_status()
        self.assertTrue(isinstance(status, agent.IronicPythonAgentStatus))
        self.assertEqual(status.started_at, started_at)
        self.assertEqual(status.version,
                         pkg_resources.get_distribution('ironic-python-agent')
                         .version)

    @mock.patch('wsgiref.simple_server.make_server', autospec=True)
    @mock.patch.object(hardware.HardwareManager, 'list_hardware_info')
    def test_run(self, mocked_list_hardware, wsgi_server_cls):
        wsgi_server = wsgi_server_cls.return_value
        wsgi_server.start.side_effect = KeyboardInterrupt()

        self.agent.heartbeater = mock.Mock()
        self.agent.api_client.lookup_node = mock.Mock()
        self.agent.api_client.lookup_node.return_value = {
            'node': {
                'uuid': 'deadbeef-dabb-ad00-b105-f00d00bab10c'
            },
            'heartbeat_timeout': 300
        }
        self.agent.run()

        listen_addr = ('192.0.2.1', 9999)
        wsgi_server_cls.assert_called_once_with(
            listen_addr[0],
            listen_addr[1],
            self.agent.api,
            server_class=simple_server.WSGIServer)
        wsgi_server.serve_forever.assert_called_once()

        self.agent.heartbeater.start.assert_called_once_with()

    def test_async_command_success(self):
        result = base.AsyncCommandResult('foo_command', {'fail': False},
                                         foo_execute)
        expected_result = {
            'id': result.id,
            'command_name': 'foo_command',
            'command_params': {
                'fail': False,
            },
            'command_status': 'RUNNING',
            'command_result': None,
            'command_error': None,
        }
        self.assertEqualEncoded(result, expected_result)

        result.start()
        result.join()

        expected_result['command_status'] = 'SUCCEEDED'
        expected_result['command_result'] = 'command execution succeeded'

        self.assertEqualEncoded(result, expected_result)

    def test_async_command_failure(self):
        result = base.AsyncCommandResult('foo_command', {'fail': True},
                                         foo_execute)
        expected_result = {
            'id': result.id,
            'command_name': 'foo_command',
            'command_params': {
                'fail': True,
            },
            'command_status': 'RUNNING',
            'command_result': None,
            'command_error': None,
        }
        self.assertEqualEncoded(result, expected_result)

        result.start()
        result.join()

        expected_result['command_status'] = 'FAILED'
        expected_result['command_error'] = errors.CommandExecutionError(
            str(EXPECTED_ERROR))

        self.assertEqualEncoded(result, expected_result)


class TestAgentCmd(test_base.BaseTestCase):
    @mock.patch('ironic_python_agent.openstack.common.log.getLogger')
    @mock.patch(OPEN_FUNCTION_NAME)
    def test__get_kernel_params_fail(self, logger_mock, open_mock):
        open_mock.side_effect = Exception
        params = agent_cmd._get_kernel_params()
        self.assertEqual(params, {})

    @mock.patch(OPEN_FUNCTION_NAME)
    def test__get_kernel_params(self, open_mock):
        kernel_line = 'api-url=http://localhost:9999 baz foo=bar\n'
        open_mock.return_value.__enter__ = lambda s: s
        open_mock.return_value.__exit__ = mock.Mock()
        read_mock = open_mock.return_value.read
        read_mock.return_value = kernel_line
        params = agent_cmd._get_kernel_params()
        self.assertEqual(params['api-url'], 'http://localhost:9999')
        self.assertEqual(params['foo'], 'bar')
        self.assertFalse('baz' in params)