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fixtures.py
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fixtures.py
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# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# 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.
"""Fixtures for Nova tests."""
from __future__ import absolute_import
import logging as std_logging
import os
import warnings
import fixtures
import mock
from oslo_config import cfg
from oslo_db.sqlalchemy import enginefacade
from oslo_messaging import conffixture as messaging_conffixture
import six
from nova.compute import rpcapi as compute_rpcapi
from nova import context
from nova.db import migration
from nova.db.sqlalchemy import api as session
from nova import exception
from nova import objects
from nova.objects import base as obj_base
from nova.objects import service as service_obj
from nova import rpc
from nova import service
from nova.tests.functional.api import client
_TRUE_VALUES = ('True', 'true', '1', 'yes')
CONF = cfg.CONF
DB_SCHEMA = {'main': "", 'api': ""}
SESSION_CONFIGURED = False
class ServiceFixture(fixtures.Fixture):
"""Run a service as a test fixture."""
def __init__(self, name, host=None, **kwargs):
name = name
# If not otherwise specified, the host will default to the
# name of the service. Some things like aggregates care that
# this is stable.
host = host or name
kwargs.setdefault('host', host)
kwargs.setdefault('binary', 'nova-%s' % name)
self.kwargs = kwargs
def setUp(self):
super(ServiceFixture, self).setUp()
self.service = service.Service.create(**self.kwargs)
self.service.start()
self.addCleanup(self.service.kill)
class NullHandler(std_logging.Handler):
"""custom default NullHandler to attempt to format the record.
Used in conjunction with
log_fixture.get_logging_handle_error_fixture to detect formatting errors in
debug level logs without saving the logs.
"""
def handle(self, record):
self.format(record)
def emit(self, record):
pass
def createLock(self):
self.lock = None
class StandardLogging(fixtures.Fixture):
"""Setup Logging redirection for tests.
There are a number of things we want to handle with logging in tests:
* Redirect the logging to somewhere that we can test or dump it later.
* Ensure that as many DEBUG messages as possible are actually
executed, to ensure they are actually syntactically valid (they
often have not been).
* Ensure that we create useful output for tests that doesn't
overwhelm the testing system (which means we can't capture the
100 MB of debug logging on every run).
To do this we create a logger fixture at the root level, which
defaults to INFO and create a Null Logger at DEBUG which lets
us execute log messages at DEBUG but not keep the output.
To support local debugging OS_DEBUG=True can be set in the
environment, which will print out the full debug logging.
There are also a set of overrides for particularly verbose
modules to be even less than INFO.
"""
def setUp(self):
super(StandardLogging, self).setUp()
# set root logger to debug
root = std_logging.getLogger()
root.setLevel(std_logging.DEBUG)
# supports collecting debug level for local runs
if os.environ.get('OS_DEBUG') in _TRUE_VALUES:
level = std_logging.DEBUG
else:
level = std_logging.INFO
# Collect logs
fs = '%(asctime)s %(levelname)s [%(name)s] %(message)s'
self.logger = self.useFixture(
fixtures.FakeLogger(format=fs, level=None))
# TODO(sdague): why can't we send level through the fake
# logger? Tests prove that it breaks, but it's worth getting
# to the bottom of.
root.handlers[0].setLevel(level)
if level > std_logging.DEBUG:
# Just attempt to format debug level logs, but don't save them
handler = NullHandler()
self.useFixture(fixtures.LogHandler(handler, nuke_handlers=False))
handler.setLevel(std_logging.DEBUG)
# Don't log every single DB migration step
std_logging.getLogger(
'migrate.versioning.api').setLevel(std_logging.WARNING)
class OutputStreamCapture(fixtures.Fixture):
"""Capture output streams during tests.
This fixture captures errant printing to stderr / stdout during
the tests and lets us see those streams at the end of the test
runs instead. Useful to see what was happening during failed
tests.
"""
def setUp(self):
super(OutputStreamCapture, self).setUp()
if os.environ.get('OS_STDOUT_CAPTURE') in _TRUE_VALUES:
self.out = self.useFixture(fixtures.StringStream('stdout'))
self.useFixture(
fixtures.MonkeyPatch('sys.stdout', self.out.stream))
if os.environ.get('OS_STDERR_CAPTURE') in _TRUE_VALUES:
self.err = self.useFixture(fixtures.StringStream('stderr'))
self.useFixture(
fixtures.MonkeyPatch('sys.stderr', self.err.stream))
@property
def stderr(self):
return self.err._details["stderr"].as_text()
@property
def stdout(self):
return self.out._details["stdout"].as_text()
class Timeout(fixtures.Fixture):
"""Setup per test timeouts.
In order to avoid test deadlocks we support setting up a test
timeout parameter read from the environment. In almost all
cases where the timeout is reached this means a deadlock.
A class level TIMEOUT_SCALING_FACTOR also exists, which allows
extremely long tests to specify they need more time.
"""
def __init__(self, timeout, scaling=1):
super(Timeout, self).__init__()
try:
self.test_timeout = int(timeout)
except ValueError:
# If timeout value is invalid do not set a timeout.
self.test_timeout = 0
if scaling >= 1:
self.test_timeout *= scaling
else:
raise ValueError('scaling value must be >= 1')
def setUp(self):
super(Timeout, self).setUp()
if self.test_timeout > 0:
self.useFixture(fixtures.Timeout(self.test_timeout, gentle=True))
class DatabasePoisonFixture(fixtures.Fixture):
def setUp(self):
super(DatabasePoisonFixture, self).setUp()
self.useFixture(fixtures.MonkeyPatch(
'oslo_db.sqlalchemy.enginefacade._TransactionFactory.'
'_create_session',
self._poison_configure))
def _poison_configure(self, *a, **k):
warnings.warn('This test uses methods that set internal oslo_db '
'state, but it does not claim to use the database. '
'This will conflict with the setup of tests that '
'do use the database and cause failures later.')
return mock.MagicMock()
class Database(fixtures.Fixture):
def __init__(self, database='main', connection=None):
"""Create a database fixture.
:param database: The type of database, 'main' or 'api'
:param connection: The connection string to use
"""
super(Database, self).__init__()
# NOTE(pkholkin): oslo_db.enginefacade is configured in tests the same
# way as it is done for any other service that uses db
global SESSION_CONFIGURED
if not SESSION_CONFIGURED:
session.configure(CONF)
SESSION_CONFIGURED = True
self.database = database
if database == 'main':
if connection is not None:
ctxt_mgr = session.create_context_manager(
connection=connection)
facade = ctxt_mgr.get_legacy_facade()
self.get_engine = facade.get_engine
else:
self.get_engine = session.get_engine
elif database == 'api':
self.get_engine = session.get_api_engine
def _cache_schema(self):
global DB_SCHEMA
if not DB_SCHEMA[self.database]:
engine = self.get_engine()
conn = engine.connect()
migration.db_sync(database=self.database)
DB_SCHEMA[self.database] = "".join(line for line
in conn.connection.iterdump())
engine.dispose()
def cleanup(self):
engine = self.get_engine()
engine.dispose()
def reset(self):
self._cache_schema()
engine = self.get_engine()
engine.dispose()
conn = engine.connect()
conn.connection.executescript(DB_SCHEMA[self.database])
def setUp(self):
super(Database, self).setUp()
self.reset()
self.addCleanup(self.cleanup)
class DatabaseAtVersion(fixtures.Fixture):
def __init__(self, version, database='main'):
"""Create a database fixture.
:param version: Max version to sync to (or None for current)
:param database: The type of database, 'main' or 'api'
"""
super(DatabaseAtVersion, self).__init__()
self.database = database
self.version = version
if database == 'main':
self.get_engine = session.get_engine
elif database == 'api':
self.get_engine = session.get_api_engine
def cleanup(self):
engine = self.get_engine()
engine.dispose()
def reset(self):
engine = self.get_engine()
engine.dispose()
engine.connect()
migration.db_sync(version=self.version, database=self.database)
def setUp(self):
super(DatabaseAtVersion, self).setUp()
self.reset()
self.addCleanup(self.cleanup)
class DefaultFlavorsFixture(fixtures.Fixture):
def setUp(self):
super(DefaultFlavorsFixture, self).setUp()
ctxt = context.get_admin_context()
defaults = {'rxtx_factor': 1.0, 'disabled': False, 'is_public': True,
'ephemeral_gb': 0, 'swap': 0}
default_flavors = [
objects.Flavor(context=ctxt, memory_mb=512, vcpus=1,
root_gb=1, flavorid='1', name='m1.tiny',
**defaults),
objects.Flavor(context=ctxt, memory_mb=2048, vcpus=1,
root_gb=20, flavorid='2', name='m1.small',
**defaults),
objects.Flavor(context=ctxt, memory_mb=4096, vcpus=2,
root_gb=40, flavorid='3', name='m1.medium',
**defaults),
objects.Flavor(context=ctxt, memory_mb=8192, vcpus=4,
root_gb=80, flavorid='4', name='m1.large',
**defaults),
objects.Flavor(context=ctxt, memory_mb=16384, vcpus=8,
root_gb=160, flavorid='5', name='m1.xlarge',
**defaults),
]
for flavor in default_flavors:
flavor.create()
class RPCFixture(fixtures.Fixture):
def __init__(self, *exmods):
super(RPCFixture, self).__init__()
self.exmods = []
self.exmods.extend(exmods)
def setUp(self):
super(RPCFixture, self).setUp()
self.addCleanup(rpc.cleanup)
rpc.add_extra_exmods(*self.exmods)
self.addCleanup(rpc.clear_extra_exmods)
self.messaging_conf = messaging_conffixture.ConfFixture(CONF)
self.messaging_conf.transport_driver = 'fake'
self.useFixture(self.messaging_conf)
rpc.init(CONF)
class WarningsFixture(fixtures.Fixture):
"""Filters out warnings during test runs."""
def setUp(self):
super(WarningsFixture, self).setUp()
# NOTE(sdague): Make deprecation warnings only happen once. Otherwise
# this gets kind of crazy given the way that upstream python libs use
# this.
warnings.simplefilter("once", DeprecationWarning)
warnings.filterwarnings('ignore',
message='With-statements now directly support'
' multiple context managers')
self.addCleanup(warnings.resetwarnings)
class ConfPatcher(fixtures.Fixture):
"""Fixture to patch and restore global CONF.
This also resets overrides for everything that is patched during
it's teardown.
"""
def __init__(self, **kwargs):
"""Constructor
:params group: if specified all config options apply to that group.
:params **kwargs: the rest of the kwargs are processed as a
set of key/value pairs to be set as configuration override.
"""
super(ConfPatcher, self).__init__()
self.group = kwargs.pop('group', None)
self.args = kwargs
def setUp(self):
super(ConfPatcher, self).setUp()
for k, v in six.iteritems(self.args):
self.addCleanup(CONF.clear_override, k, self.group)
CONF.set_override(k, v, self.group)
class OSAPIFixture(fixtures.Fixture):
"""Create an OS API server as a fixture.
This spawns an OS API server as a fixture in a new greenthread in
the current test. The fixture has a .api paramenter with is a
simple rest client that can communicate with it.
This fixture is extremely useful for testing REST responses
through the WSGI stack easily in functional tests.
Usage:
api = self.useFixture(fixtures.OSAPIFixture()).api
resp = api.api_request('/someurl')
self.assertEqual(200, resp.status_code)
resp = api.api_request('/otherurl', method='POST', body='{foo}')
The resp is a requests library response. Common attributes that
you'll want to use are:
- resp.status_code - integer HTTP status code returned by the request
- resp.content - the body of the response
- resp.headers - dictionary of HTTP headers returned
"""
def __init__(self, api_version='v2',
project_id='6f70656e737461636b20342065766572'):
"""Constructor
:param api_version: the API version that we're interested in
using. Currently this expects 'v2' or 'v2.1' as possible
options.
:param project_id: the project id to use on the API.
"""
super(OSAPIFixture, self).__init__()
self.api_version = api_version
self.project_id = project_id
def setUp(self):
super(OSAPIFixture, self).setUp()
# in order to run these in tests we need to bind only to local
# host, and dynamically allocate ports
conf_overrides = {
'osapi_compute_listen': '127.0.0.1',
'osapi_compute_listen_port': 0,
'verbose': True,
'debug': True,
}
self.useFixture(ConfPatcher(**conf_overrides))
self.osapi = service.WSGIService("osapi_compute")
self.osapi.start()
self.addCleanup(self.osapi.stop)
self.auth_url = 'http://%(host)s:%(port)s/%(api_version)s' % ({
'host': self.osapi.host, 'port': self.osapi.port,
'api_version': self.api_version})
self.api = client.TestOpenStackClient('fake', 'fake', self.auth_url,
self.project_id)
self.admin_api = client.TestOpenStackClient(
'admin', 'admin', self.auth_url, self.project_id)
class OSMetadataServer(fixtures.Fixture):
"""Create an OS Metadata API server as a fixture.
This spawns an OS Metadata API server as a fixture in a new
greenthread in the current test.
TODO(sdague): ideally for testing we'd have something like the
test client which acts like requests, but connects any of the
interactions needed.
"""
def setUp(self):
super(OSMetadataServer, self).setUp()
# in order to run these in tests we need to bind only to local
# host, and dynamically allocate ports
conf_overrides = {
'metadata_listen': '127.0.0.1',
'metadata_listen_port': 0,
'verbose': True,
'debug': True
}
self.useFixture(ConfPatcher(**conf_overrides))
# NOTE(mikal): we don't have root to manipulate iptables, so just
# zero that bit out.
self.useFixture(fixtures.MonkeyPatch(
'nova.network.linux_net.IptablesManager._apply',
lambda _: None))
self.metadata = service.WSGIService("metadata")
self.metadata.start()
self.addCleanup(self.metadata.stop)
self.md_url = "http://%s:%s/" % (
conf_overrides['metadata_listen'],
self.metadata.port)
class PoisonFunctions(fixtures.Fixture):
"""Poison functions so they explode if we touch them.
When running under a non full stack test harness there are parts
of the code that you don't want to go anywhere near. These include
things like code that spins up extra threads, which just
introduces races.
"""
def setUp(self):
super(PoisonFunctions, self).setUp()
# The nova libvirt driver starts an event thread which only
# causes trouble in tests. Make sure that if tests don't
# properly patch it the test explodes.
# explicit import because MonkeyPatch doesn't magic import
# correctly if we are patching a method on a class in a
# module.
import nova.virt.libvirt.host # noqa
def evloop(*args, **kwargs):
import sys
warnings.warn("Forgot to disable libvirt event thread")
sys.exit(1)
self.useFixture(fixtures.MonkeyPatch(
'nova.virt.libvirt.host.Host._init_events',
evloop))
class IndirectionAPIFixture(fixtures.Fixture):
"""Patch and restore the global NovaObject indirection api."""
def __init__(self, indirection_api):
"""Constructor
:param indirection_api: the indirection API to be used for tests.
"""
super(IndirectionAPIFixture, self).__init__()
self.indirection_api = indirection_api
def cleanup(self):
obj_base.NovaObject.indirection_api = self.orig_indirection_api
def setUp(self):
super(IndirectionAPIFixture, self).setUp()
self.orig_indirection_api = obj_base.NovaObject.indirection_api
obj_base.NovaObject.indirection_api = self.indirection_api
self.addCleanup(self.cleanup)
class _FakeGreenThread(object):
def __init__(self, func, *args, **kwargs):
self._result = func(*args, **kwargs)
def cancel(self, *args, **kwargs):
# This method doesn't make sense for a synchronous call, it's just
# defined to satisfy the interface.
pass
def kill(self, *args, **kwargs):
# This method doesn't make sense for a synchronous call, it's just
# defined to satisfy the interface.
pass
def link(self, func, *args, **kwargs):
func(self, *args, **kwargs)
def unlink(self, func, *args, **kwargs):
# This method doesn't make sense for a synchronous call, it's just
# defined to satisfy the interface.
pass
def wait(self):
return self._result
class SpawnIsSynchronousFixture(fixtures.Fixture):
"""Patch and restore the spawn_n utility method to be synchronous"""
def setUp(self):
super(SpawnIsSynchronousFixture, self).setUp()
self.useFixture(fixtures.MonkeyPatch(
'nova.utils.spawn_n', _FakeGreenThread))
self.useFixture(fixtures.MonkeyPatch(
'nova.utils.spawn', _FakeGreenThread))
class BannedDBSchemaOperations(fixtures.Fixture):
"""Ban some operations for migrations"""
def __init__(self, banned_resources=None):
super(BannedDBSchemaOperations, self).__init__()
self._banned_resources = banned_resources or []
@staticmethod
def _explode(resource, op):
raise exception.DBNotAllowed(
'Operation %s.%s() is not allowed in a database migration' % (
resource, op))
def setUp(self):
super(BannedDBSchemaOperations, self).setUp()
for thing in self._banned_resources:
self.useFixture(fixtures.MonkeyPatch(
'sqlalchemy.%s.drop' % thing,
lambda *a, **k: self._explode(thing, 'drop')))
self.useFixture(fixtures.MonkeyPatch(
'sqlalchemy.%s.alter' % thing,
lambda *a, **k: self._explode(thing, 'alter')))
class StableObjectJsonFixture(fixtures.Fixture):
"""Fixture that makes sure we get stable JSON object representations.
Since objects contain things like set(), which can't be converted to
JSON, we have some situations where the representation isn't fully
deterministic. This doesn't matter at all at runtime, but does to
unit tests that try to assert things at a low level.
This fixture mocks the obj_to_primitive() call and makes sure to
sort the list of changed fields (which came from a set) before
returning it to the caller.
"""
def __init__(self):
self._original_otp = obj_base.NovaObject.obj_to_primitive
def setUp(self):
super(StableObjectJsonFixture, self).setUp()
def _doit(obj, *args, **kwargs):
result = self._original_otp(obj, *args, **kwargs)
if 'nova_object.changes' in result:
result['nova_object.changes'].sort()
return result
self.useFixture(fixtures.MonkeyPatch(
'nova.objects.base.NovaObject.obj_to_primitive', _doit))
class EngineFacadeFixture(fixtures.Fixture):
"""Fixture to isolation EngineFacade during tests.
Because many elements of EngineFacade are based on globals, once
an engine facade has been initialized, all future code goes
through it. This means that the initialization of sqlite in
databases in our Database fixture will drive all connections to
sqlite. While that's fine in a production environment, during
testing this means we can't test againts multiple backends in the
same test run.
oslo.db does not yet support a reset mechanism here. This builds a
custom in tree engine facade fixture to handle this. Eventually
this will be added to oslo.db and this can be removed. Tracked by
https://bugs.launchpad.net/oslo.db/+bug/1548960
"""
def __init__(self, ctx_manager, engine, sessionmaker):
super(EngineFacadeFixture, self).__init__()
self._ctx_manager = ctx_manager
self._engine = engine
self._sessionmaker = sessionmaker
def setUp(self):
super(EngineFacadeFixture, self).setUp()
self._existing_factory = self._ctx_manager._root_factory
self._ctx_manager._root_factory = enginefacade._TestTransactionFactory(
self._engine, self._sessionmaker, apply_global=False,
synchronous_reader=True)
self.addCleanup(self.cleanup)
def cleanup(self):
self._ctx_manager._root_factory = self._existing_factory
class ForbidNewLegacyNotificationFixture(fixtures.Fixture):
"""Make sure the test fails if new legacy notification is added"""
def __init__(self):
super(ForbidNewLegacyNotificationFixture, self).__init__()
self.notifier = rpc.LegacyValidatingNotifier
def setUp(self):
super(ForbidNewLegacyNotificationFixture, self).setUp()
self.notifier.fatal = True
# allow the special test value used in
# nova.tests.unit.test_notifications.NotificationsTestCase
self.notifier.allowed_legacy_notification_event_types.append(
'_decorated_function')
self.addCleanup(self.cleanup)
def cleanup(self):
self.notifier.fatal = False
self.notifier.allowed_legacy_notification_event_types.remove(
'_decorated_function')
class AllServicesCurrent(fixtures.Fixture):
def setUp(self):
super(AllServicesCurrent, self).setUp()
self.useFixture(fixtures.MonkeyPatch(
'nova.objects.Service.get_minimum_version_multi',
self._fake_minimum))
compute_rpcapi.LAST_VERSION = None
def _fake_minimum(self, *args, **kwargs):
return service_obj.SERVICE_VERSION
class NeutronFixture(fixtures.Fixture):
"""A fixture to boot instances with neutron ports"""
# the default project_id in OsaAPIFixtures
tenant_id = '6f70656e737461636b20342065766572'
network_1 = {
'status': 'ACTIVE',
'subnets': [],
'name': 'private-network',
'admin_state_up': True,
'tenant_id': tenant_id,
'id': '3cb9bc59-5699-4588-a4b1-b87f96708bc6',
}
subnet_1 = {
'name': 'private-subnet',
'enable_dhcp': True,
'network_id': network_1['id'],
'tenant_id': tenant_id,
'dns_nameservers': [],
'allocation_pools': [
{
'start': '192.168.1.1',
'end': '192.168.1.254'
}
],
'host_routes': [],
'ip_version': 4,
'gateway_ip': '192.168.1.1',
'cidr': '192.168.1.1/24',
'id': 'f8a6e8f8-c2ec-497c-9f23-da9616de54ef'
}
network_1['subnets'] = [subnet_1['id']]
port_1 = {
'id': 'ce531f90-199f-48c0-816c-13e38010b442',
'network_id': network_1['id'],
'admin_state_up': True,
'status': 'ACTIVE',
'mac_address': 'fa:16:3e:4c:2c:30',
'fixed_ips': [
{
'ip_address': '192.168.1.3',
'subnet_id': subnet_1['id']
}
],
'tenant_id': tenant_id
}
def __init__(self, test):
super(NeutronFixture, self).__init__()
self.test = test
def setUp(self):
super(NeutronFixture, self).setUp()
self.test.stub_out(
'nova.network.neutronv2.api.API.'
'validate_networks',
lambda *args, **kwargs: 1)
self.test.stub_out(
'nova.network.neutronv2.api.API.'
'create_pci_requests_for_sriov_ports',
lambda *args, **kwargs: None)
self.test.stub_out(
'nova.network.security_group.neutron_driver.SecurityGroupAPI.'
'get_instances_security_groups_bindings',
lambda *args, **kwargs: {})
mock_neutron_client = mock.Mock()
mock_neutron_client.list_extensions.return_value = {'extensions': []}
mock_neutron_client.show_port.return_value = {
'port': NeutronFixture.port_1}
mock_neutron_client.list_networks.return_value = {
'networks': [NeutronFixture.network_1]}
mock_neutron_client.list_ports.return_value = {
'ports': [NeutronFixture.port_1]}
mock_neutron_client.list_subnets.return_value = {
'subnets': [NeutronFixture.subnet_1]}
mock_neutron_client.list_floatingips.return_value = {'floatingips': []}
mock_neutron_client.update_port.return_value = {
'port': NeutronFixture.port_1}
self.test.stub_out(
'nova.network.neutronv2.api.get_client',
lambda *args, **kwargs: mock_neutron_client)