Python resource.Metadata类代码示例

    def _create_stubs(self, key_name='test', stub_meta=True):

        self.m.StubOutWithMock(user.User, 'keystone')
        user.User.keystone().AndReturn(self.fkc)
        self.m.StubOutWithMock(user.AccessKey, 'keystone')
        user.AccessKey.keystone().AndReturn(self.fkc)

        self.m.StubOutWithMock(wc.WaitConditionHandle, 'keystone')
        wc.WaitConditionHandle.keystone().MultipleTimes().AndReturn(self.fkc)

        server_name = utils.PhysName(utils.PhysName('test_stack',
                                                    'LoadBalancer'),
                                     'LB_instance')
        clients.OpenStackClients.nova(
            "compute").MultipleTimes().AndReturn(self.fc)
        self.fc.servers.create(
            flavor=2, image=745, key_name=key_name,
            meta=None, nics=None, name=server_name,
            scheduler_hints=None, userdata=mox.IgnoreArg(),
            security_groups=None, availability_zone=None).AndReturn(
                self.fc.servers.list()[1])
        if stub_meta:
            Metadata.__set__(mox.IgnoreArg(),
                             mox.IgnoreArg()).AndReturn(None)

        self.m.StubOutWithMock(wc.WaitConditionHandle, 'get_status')
        wc.WaitConditionHandle.get_status().AndReturn(['SUCCESS'])

    def test_scaling_policy_cooldown_none(self):
        t = template_format.parse(as_template)
        stack = utils.parse_stack(t, params=self.params)

        # Create initial group
        self._stub_lb_reload(1)
        now = timeutils.utcnow()
        self._stub_meta_expected(now, 'ExactCapacity : 1')
        self._stub_create(1)
        self.m.ReplayAll()
        rsrc = self.create_scaling_group(t, stack, 'WebServerGroup')
        stack.resources['WebServerGroup'] = rsrc
        self.assertEqual(['WebServerGroup-0'], rsrc.get_instance_names())

        # Create the scaling policy no Cooldown property, should behave the
        # same as when Cooldown==0
        properties = t['Resources']['WebServerScaleUpPolicy']['Properties']
        del(properties['Cooldown'])
        self._stub_lb_reload(2)
        now = timeutils.utcnow()
        self._stub_meta_expected(now, 'ChangeInCapacity : 1', 2)
        self._stub_create(1)

        self.m.StubOutWithMock(asc.ScalingPolicy, 'keystone')
        asc.ScalingPolicy.keystone().MultipleTimes().AndReturn(
            self.fc)

        self.m.ReplayAll()
        up_policy = self.create_scaling_policy(t, stack,
                                               'WebServerScaleUpPolicy')
        up_policy.signal()
        self.assertEqual(['WebServerGroup-0', 'WebServerGroup-1'],
                         rsrc.get_instance_names())

        # Now trigger another scale-up without changing time, should work
        previous_meta = {timeutils.strtime(now): 'ChangeInCapacity : 1'}
        self.m.VerifyAll()
        self.m.UnsetStubs()

        self.m.StubOutWithMock(Metadata, '__get__')
        Metadata.__get__(mox.IgnoreArg(), up_policy, mox.IgnoreArg()
                         ).AndReturn(previous_meta)
        Metadata.__get__(mox.IgnoreArg(), rsrc, mox.IgnoreArg()
                         ).AndReturn(previous_meta)

        self._stub_lb_reload(3, unset=False)
        self._stub_meta_expected(now, 'ChangeInCapacity : 1', 2)
        self._stub_create(1)

        self.m.ReplayAll()
        up_policy.signal()
        self.assertEqual(['WebServerGroup-0', 'WebServerGroup-1',
                          'WebServerGroup-2'],
                         rsrc.get_instance_names())

        rsrc.delete()
        self.m.VerifyAll()

    def test_scaling_policy_cooldown_toosoon(self):
        t = template_format.parse(as_template)
        stack = parse_stack(t, params=self.params)

        # Create initial group
        self._stub_lb_reload(1)
        now = timeutils.utcnow()
        self._stub_meta_expected(now, 'ExactCapacity : 1')
        self._stub_create(1)
        self.m.ReplayAll()
        rsrc = self.create_scaling_group(t, stack, 'WebServerGroup')
        stack.resources['WebServerGroup'] = rsrc
        self.assertEqual('WebServerGroup-0', rsrc.resource_id)

        # Scale up one
        self._stub_lb_reload(2)
        self._stub_meta_expected(now, 'ChangeInCapacity : 1', 2)
        self._stub_create(1)

        self.m.StubOutWithMock(asc.ScalingPolicy, 'keystone')
        asc.ScalingPolicy.keystone().MultipleTimes().AndReturn(
            self.fc)

        self.m.ReplayAll()
        up_policy = self.create_scaling_policy(t, stack,
                                               'WebServerScaleUpPolicy')
        up_policy.signal()
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         rsrc.resource_id)

        # Now move time on 10 seconds - Cooldown in template is 60
        # so this should not update the policy metadata, and the
        # scaling group instances should be unchanged
        # Note we have to stub Metadata.__get__ since up_policy isn't
        # stored in the DB (because the stack hasn't really been created)
        previous_meta = {timeutils.strtime(now): 'ChangeInCapacity : 1'}

        self.m.VerifyAll()
        self.m.UnsetStubs()

        now = now + datetime.timedelta(seconds=10)
        self.m.StubOutWithMock(timeutils, 'utcnow')
        timeutils.utcnow().MultipleTimes().AndReturn(now)

        self.m.StubOutWithMock(Metadata, '__get__')
        Metadata.__get__(mox.IgnoreArg(), up_policy, mox.IgnoreArg()
                         ).AndReturn(previous_meta)

        self.m.ReplayAll()
        up_policy.signal()
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         rsrc.resource_id)

        rsrc.delete()
        self.m.VerifyAll()

    def test_scaling_policy_cooldown_ok(self):
        t = template_format.parse(as_template)
        stack = utils.parse_stack(t, params=self.params)

        # Create initial group
        self._stub_lb_reload(1)
        now = timeutils.utcnow()
        self._stub_meta_expected(now, 'ExactCapacity : 1')
        self._stub_create(1)
        self.m.ReplayAll()
        rsrc = self.create_scaling_group(t, stack, 'WebServerGroup')
        stack.resources['WebServerGroup'] = rsrc
        self.assertEqual(['WebServerGroup-0'], rsrc.get_instance_names())

        # Scale up one
        self._stub_lb_reload(2)
        self._stub_meta_expected(now, 'ChangeInCapacity : 1', 2)
        self._stub_create(1)

        self.m.StubOutWithMock(asc.ScalingPolicy, 'keystone')
        asc.ScalingPolicy.keystone().MultipleTimes().AndReturn(
            self.fc)

        self.m.ReplayAll()
        up_policy = self.create_scaling_policy(t, stack,
                                               'WebServerScaleUpPolicy')
        up_policy.signal()
        self.assertEqual(['WebServerGroup-0', 'WebServerGroup-1'],
                         rsrc.get_instance_names())

        # Now move time on 61 seconds - Cooldown in template is 60
        # so this should trigger a scale-up
        previous_meta = {timeutils.strtime(now): 'ChangeInCapacity : 1'}
        self.m.VerifyAll()
        self.m.UnsetStubs()

        self.m.StubOutWithMock(Metadata, '__get__')
        Metadata.__get__(mox.IgnoreArg(), up_policy, mox.IgnoreArg()
                         ).AndReturn(previous_meta)
        Metadata.__get__(mox.IgnoreArg(), rsrc, mox.IgnoreArg()
                         ).AndReturn(previous_meta)

        now = now + datetime.timedelta(seconds=61)
        self._stub_lb_reload(3, unset=False)
        self._stub_meta_expected(now, 'ChangeInCapacity : 1', 2)
        self._stub_create(1)

        self.m.ReplayAll()
        up_policy.signal()
        self.assertEqual(['WebServerGroup-0', 'WebServerGroup-1',
                          'WebServerGroup-2'],
                         rsrc.get_instance_names())

        rsrc.delete()
        self.m.VerifyAll()

    def test_scaling_group_cooldown_toosoon(self):
        t = self.load_template()
        stack = self.parse_stack(t)

        # Create initial group, 2 instances, Cooldown 60s
        properties = t['Resources']['WebServerGroup']['Properties']
        properties['DesiredCapacity'] = '2'
        properties['Cooldown'] = '60'
        self._stub_lb_reload(['WebServerGroup-0', 'WebServerGroup-1'])
        now = timeutils.utcnow()
        self._stub_meta_expected(now, 'ExactCapacity : 2')
        self._stub_create(2)
        self.m.ReplayAll()
        resource = self.create_scaling_group(t, stack, 'WebServerGroup')
        stack.resources['WebServerGroup'] = resource
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         resource.resource_id)

        # reduce by 50%
        self._stub_lb_reload(['WebServerGroup-0'])
        self._stub_meta_expected(now, 'PercentChangeInCapacity : -50')
        self.m.ReplayAll()
        resource.adjust(-50, 'PercentChangeInCapacity')
        self.assertEqual('WebServerGroup-0',
                         resource.resource_id)

        # Now move time on 10 seconds - Cooldown in template is 60
        # so this should not update the policy metadata, and the
        # scaling group instances should be unchanged
        # Note we have to stub Metadata.__get__ since up_policy isn't
        # stored in the DB (because the stack hasn't really been created)
        previous_meta = {timeutils.strtime(now):
                         'PercentChangeInCapacity : -50'}

        self.m.VerifyAll()
        self.m.UnsetStubs()

        now = now + datetime.timedelta(seconds=10)
        self.m.StubOutWithMock(timeutils, 'utcnow')
        timeutils.utcnow().AndReturn(now)

        self.m.StubOutWithMock(Metadata, '__get__')
        Metadata.__get__(mox.IgnoreArg(), resource, mox.IgnoreArg()
                         ).AndReturn(previous_meta)

        self.m.ReplayAll()

        # raise by 200%, too soon for Cooldown so there should be no change
        resource.adjust(200, 'PercentChangeInCapacity')
        self.assertEqual('WebServerGroup-0', resource.resource_id)

        resource.delete()

    def test_scaling_group_cooldown_ok(self):
        t = self.load_template()
        stack = self.parse_stack(t)

        # Create initial group, 2 instances, Cooldown 60s
        properties = t['Resources']['WebServerGroup']['Properties']
        properties['DesiredCapacity'] = '2'
        properties['Cooldown'] = '60'
        self._stub_lb_reload(['WebServerGroup-0', 'WebServerGroup-1'])
        self._stub_create(2)
        now = timeutils.utcnow()
        self._stub_meta_expected(now, 'ExactCapacity : 2')
        self.m.ReplayAll()
        resource = self.create_scaling_group(t, stack, 'WebServerGroup')
        stack.resources['WebServerGroup'] = resource
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         resource.resource_id)

        # reduce by 50%
        self._stub_lb_reload(['WebServerGroup-0'])
        self._stub_meta_expected(now, 'PercentChangeInCapacity : -50')
        self.m.ReplayAll()
        resource.adjust(-50, 'PercentChangeInCapacity')
        self.assertEqual('WebServerGroup-0',
                         resource.resource_id)

        # Now move time on 61 seconds - Cooldown in template is 60
        # so this should update the policy metadata, and the
        # scaling group instances updated
        previous_meta = {timeutils.strtime(now):
                         'PercentChangeInCapacity : -50'}

        self.m.VerifyAll()
        self.m.UnsetStubs()

        now = now + datetime.timedelta(seconds=61)

        self.m.StubOutWithMock(Metadata, '__get__')
        Metadata.__get__(mox.IgnoreArg(), resource, mox.IgnoreArg()
                         ).AndReturn(previous_meta)

        # raise by 200%, should work
        self._stub_lb_reload(['WebServerGroup-0', 'WebServerGroup-1',
                              'WebServerGroup-2'], unset=False)
        self._stub_create(2)
        self._stub_meta_expected(now, 'PercentChangeInCapacity : 200')
        self.m.ReplayAll()
        resource.adjust(200, 'PercentChangeInCapacity')
        self.assertEqual('WebServerGroup-0,WebServerGroup-1,WebServerGroup-2',
                         resource.resource_id)

        resource.delete()

    def test_scaling_policy_cooldown_none(self):
        t = self.load_template()
        stack = self.parse_stack(t)

        # Create initial group
        self._stub_lb_reload(['WebServerGroup-0'])
        now = timeutils.utcnow()
        self._stub_meta_expected(now, 'ExactCapacity : 1')
        self._stub_create(1)
        self.m.ReplayAll()
        resource = self.create_scaling_group(t, stack, 'WebServerGroup')
        stack.resources['WebServerGroup'] = resource
        self.assertEqual('WebServerGroup-0', resource.resource_id)

        # Create the scaling policy no Cooldown property, should behave the
        # same as when Cooldown==0
        properties = t['Resources']['WebServerScaleUpPolicy']['Properties']
        del(properties['Cooldown'])
        self._stub_lb_reload(['WebServerGroup-0', 'WebServerGroup-1'])
        now = timeutils.utcnow()
        self._stub_meta_expected(now, 'ChangeInCapacity : 1', 2)
        self._stub_create(1)
        self.m.ReplayAll()
        up_policy = self.create_scaling_policy(t, stack,
                                               'WebServerScaleUpPolicy')
        up_policy.alarm()
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         resource.resource_id)

        # Now trigger another scale-up without changing time, should work
        previous_meta = {timeutils.strtime(now): 'ChangeInCapacity : 1'}
        self.m.VerifyAll()
        self.m.UnsetStubs()

        self.m.StubOutWithMock(Metadata, '__get__')
        Metadata.__get__(mox.IgnoreArg(), up_policy, mox.IgnoreArg()
                         ).AndReturn(previous_meta)
        Metadata.__get__(mox.IgnoreArg(), resource, mox.IgnoreArg()
                         ).AndReturn(previous_meta)

        self._stub_lb_reload(['WebServerGroup-0', 'WebServerGroup-1',
                              'WebServerGroup-2'], unset=False)
        self._stub_meta_expected(now, 'ChangeInCapacity : 1', 2)
        self._stub_create(1)

        self.m.ReplayAll()
        up_policy.alarm()
        self.assertEqual('WebServerGroup-0,WebServerGroup-1,WebServerGroup-2',
                         resource.resource_id)

        resource.delete()
        self.m.VerifyAll()

    def _stub_meta_expected(self, now, data, nmeta=1):
        # Stop time at now
        self.m.StubOutWithMock(timeutils, 'utcnow')
        timeutils.utcnow().MultipleTimes().AndReturn(now)

        # Then set a stub to ensure the metadata update is as
        # expected based on the timestamp and data
        self.m.StubOutWithMock(Metadata, '__set__')
        expected = {timeutils.strtime(now): data}
        # Note for ScalingPolicy, we expect to get a metadata
        # update for the policy and autoscaling group, so pass nmeta=2
        for x in range(nmeta):
            Metadata.__set__(mox.IgnoreArg(), expected).AndReturn(None)

    def test_scaling_policy_cooldown_ok(self):
        t = self.load_template()
        stack = self.parse_stack(t)

        # Create initial group
        self._stub_lb_reload(['WebServerGroup-0'])
        now = timeutils.utcnow()
        self._stub_meta_expected(now, 'ExactCapacity : 1')
        self._stub_create(1)
        self.m.ReplayAll()
        resource = self.create_scaling_group(t, stack, 'WebServerGroup')
        stack.resources['WebServerGroup'] = resource
        self.assertEqual('WebServerGroup-0', resource.resource_id)

        # Scale up one
        self._stub_lb_reload(['WebServerGroup-0', 'WebServerGroup-1'])
        self._stub_meta_expected(now, 'ChangeInCapacity : 1', 2)
        self._stub_create(1)
        self.m.ReplayAll()
        up_policy = self.create_scaling_policy(t, stack,
                                               'WebServerScaleUpPolicy')
        up_policy.alarm()
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         resource.resource_id)

        # Now move time on 61 seconds - Cooldown in template is 60
        # so this should trigger a scale-up
        previous_meta = {timeutils.strtime(now): 'ChangeInCapacity : 1'}
        self.m.VerifyAll()
        self.m.UnsetStubs()

        self.m.StubOutWithMock(Metadata, '__get__')
        Metadata.__get__(mox.IgnoreArg(), up_policy, mox.IgnoreArg()
                         ).AndReturn(previous_meta)
        Metadata.__get__(mox.IgnoreArg(), resource, mox.IgnoreArg()
                         ).AndReturn(previous_meta)

        now = now + datetime.timedelta(seconds=61)
        self._stub_lb_reload(['WebServerGroup-0', 'WebServerGroup-1',
                              'WebServerGroup-2'], unset=False)
        self._stub_meta_expected(now, 'ChangeInCapacity : 1', 2)
        self._stub_create(1)

        self.m.ReplayAll()
        up_policy.alarm()
        self.assertEqual('WebServerGroup-0,WebServerGroup-1,WebServerGroup-2',
                         resource.resource_id)

        resource.delete()
        self.m.VerifyAll()

    def test_scaling_group_cooldown_toosoon(self):
        t = template_format.parse(as_template)
        stack = utils.parse_stack(t, params=self.params)

        # Create initial group, 2 instances, Cooldown 60s
        properties = t["Resources"]["WebServerGroup"]["Properties"]
        properties["DesiredCapacity"] = "2"
        properties["Cooldown"] = "60"
        self._stub_lb_reload(2)
        now = timeutils.utcnow()
        self._stub_meta_expected(now, "ExactCapacity : 2")
        self._stub_create(2)
        self.m.ReplayAll()
        rsrc = self.create_scaling_group(t, stack, "WebServerGroup")
        stack.resources["WebServerGroup"] = rsrc
        self.assertEqual(["WebServerGroup-0", "WebServerGroup-1"], rsrc.get_instance_names())

        # reduce by 50%
        self._stub_lb_reload(1)
        self._stub_validate()
        self._stub_meta_expected(now, "PercentChangeInCapacity : -50")
        self.m.ReplayAll()
        rsrc.adjust(-50, "PercentChangeInCapacity")
        self.assertEqual(["WebServerGroup-0"], rsrc.get_instance_names())

        # Now move time on 10 seconds - Cooldown in template is 60
        # so this should not update the policy metadata, and the
        # scaling group instances should be unchanged
        # Note we have to stub Metadata.__get__ since up_policy isn't
        # stored in the DB (because the stack hasn't really been created)
        previous_meta = {timeutils.strtime(now): "PercentChangeInCapacity : -50"}

        self.m.VerifyAll()
        self.m.UnsetStubs()

        now = now + datetime.timedelta(seconds=10)
        self.m.StubOutWithMock(timeutils, "utcnow")
        timeutils.utcnow().MultipleTimes().AndReturn(now)

        self.m.StubOutWithMock(Metadata, "__get__")
        Metadata.__get__(mox.IgnoreArg(), rsrc, mox.IgnoreArg()).AndReturn(previous_meta)

        self.m.ReplayAll()

        # raise by 200%, too soon for Cooldown so there should be no change
        rsrc.adjust(200, "PercentChangeInCapacity")
        self.assertEqual(["WebServerGroup-0"], rsrc.get_instance_names())

        rsrc.delete()

    def test_scaling_group_cooldown_zero(self):
        t = template_format.parse(as_template)
        stack = parse_stack(t)

        # Create initial group, 2 instances, Cooldown 0
        properties = t['Resources']['WebServerGroup']['Properties']
        properties['DesiredCapacity'] = '2'
        properties['Cooldown'] = '0'
        self._stub_lb_reload(['WebServerGroup-0', 'WebServerGroup-1'])
        now = timeutils.utcnow()
        self._stub_meta_expected(now, 'ExactCapacity : 2')
        self._stub_create(2)
        self.m.ReplayAll()
        rsrc = self.create_scaling_group(t, stack, 'WebServerGroup')
        stack.resources['WebServerGroup'] = rsrc
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         rsrc.resource_id)

        # reduce by 50%
        self._stub_lb_reload(['WebServerGroup-0'])
        self._stub_meta_expected(now, 'PercentChangeInCapacity : -50')
        self.m.ReplayAll()
        rsrc.adjust(-50, 'PercentChangeInCapacity')
        self.assertEqual('WebServerGroup-0',
                         rsrc.resource_id)

        # Don't move time, since cooldown is zero, it should work
        previous_meta = {timeutils.strtime(now):
                         'PercentChangeInCapacity : -50'}

        self.m.VerifyAll()
        self.m.UnsetStubs()

        self.m.StubOutWithMock(Metadata, '__get__')
        Metadata.__get__(mox.IgnoreArg(), rsrc, mox.IgnoreArg()
                         ).AndReturn(previous_meta)

        # raise by 200%, should work
        self._stub_lb_reload(['WebServerGroup-0', 'WebServerGroup-1',
                              'WebServerGroup-2'], unset=False)
        self._stub_meta_expected(now, 'PercentChangeInCapacity : 200')
        self._stub_create(2)
        self.m.ReplayAll()
        rsrc.adjust(200, 'PercentChangeInCapacity')
        self.assertEqual('WebServerGroup-0,WebServerGroup-1,WebServerGroup-2',
                         rsrc.resource_id)

        rsrc.delete()
        self.m.VerifyAll()

    def test_scaling_policy_cooldown_zero(self):
        t = template_format.parse(as_template)
        stack = parse_stack(t)

        # Create initial group
        self._stub_lb_reload(1)
        now = timeutils.utcnow()
        self._stub_meta_expected(now, 'ExactCapacity : 1')
        self._stub_create(1)
        self.m.ReplayAll()
        rsrc = self.create_scaling_group(t, stack, 'WebServerGroup')
        stack.resources['WebServerGroup'] = rsrc
        self.assertEqual('WebServerGroup-0', rsrc.resource_id)

        # Create the scaling policy (with Cooldown=0) and scale up one
        properties = t['Resources']['WebServerScaleUpPolicy']['Properties']
        properties['Cooldown'] = '0'
        self._stub_lb_reload(2)
        self._stub_meta_expected(now, 'ChangeInCapacity : 1', 2)
        self._stub_create(1)
        self.m.ReplayAll()
        up_policy = self.create_scaling_policy(t, stack,
                                               'WebServerScaleUpPolicy')
        up_policy.alarm()
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         rsrc.resource_id)

        # Now trigger another scale-up without changing time, should work
        previous_meta = {timeutils.strtime(now): 'ChangeInCapacity : 1'}
        self.m.VerifyAll()
        self.m.UnsetStubs()

        self.m.StubOutWithMock(Metadata, '__get__')
        Metadata.__get__(mox.IgnoreArg(), up_policy, mox.IgnoreArg()
                         ).AndReturn(previous_meta)
        Metadata.__get__(mox.IgnoreArg(), rsrc, mox.IgnoreArg()
                         ).AndReturn(previous_meta)

        self._stub_lb_reload(3, unset=False)
        self._stub_meta_expected(now, 'ChangeInCapacity : 1', 2)
        self._stub_create(1)

        self.m.ReplayAll()
        up_policy.alarm()
        self.assertEqual('WebServerGroup-0,WebServerGroup-1,WebServerGroup-2',
                         rsrc.resource_id)

        rsrc.delete()
        self.m.VerifyAll()

    def test_scaling_policy_cooldown_none(self):
        t = template_format.parse(as_template)
        stack = parse_stack(t)

        # Create initial group
        self._stub_lb_reload(["WebServerGroup-0"])
        now = timeutils.utcnow()
        self._stub_meta_expected(now, "ExactCapacity : 1")
        self._stub_create(1)
        self.m.ReplayAll()
        resource = self.create_scaling_group(t, stack, "WebServerGroup")
        stack.resources["WebServerGroup"] = resource
        self.assertEqual("WebServerGroup-0", resource.resource_id)

        # Create the scaling policy no Cooldown property, should behave the
        # same as when Cooldown==0
        properties = t["Resources"]["WebServerScaleUpPolicy"]["Properties"]
        del (properties["Cooldown"])
        self._stub_lb_reload(["WebServerGroup-0", "WebServerGroup-1"])
        now = timeutils.utcnow()
        self._stub_meta_expected(now, "ChangeInCapacity : 1", 2)
        self._stub_create(1)
        self.m.ReplayAll()
        up_policy = self.create_scaling_policy(t, stack, "WebServerScaleUpPolicy")
        up_policy.alarm()
        self.assertEqual("WebServerGroup-0,WebServerGroup-1", resource.resource_id)

        # Now trigger another scale-up without changing time, should work
        previous_meta = {timeutils.strtime(now): "ChangeInCapacity : 1"}
        self.m.VerifyAll()
        self.m.UnsetStubs()

        self.m.StubOutWithMock(Metadata, "__get__")
        Metadata.__get__(mox.IgnoreArg(), up_policy, mox.IgnoreArg()).AndReturn(previous_meta)
        Metadata.__get__(mox.IgnoreArg(), resource, mox.IgnoreArg()).AndReturn(previous_meta)

        self._stub_lb_reload(["WebServerGroup-0", "WebServerGroup-1", "WebServerGroup-2"], unset=False)
        self._stub_meta_expected(now, "ChangeInCapacity : 1", 2)
        self._stub_create(1)

        self.m.ReplayAll()
        up_policy.alarm()
        self.assertEqual("WebServerGroup-0,WebServerGroup-1,WebServerGroup-2", resource.resource_id)

        resource.delete()
        self.m.VerifyAll()

    def test_scaling_policy_cooldown_toosoon(self):
        t = template_format.parse(as_template)
        stack = parse_stack(t)

        # Create initial group
        self._stub_lb_reload(["WebServerGroup-0"])
        now = timeutils.utcnow()
        self._stub_meta_expected(now, "ExactCapacity : 1")
        self._stub_create(1)
        self.m.ReplayAll()
        resource = self.create_scaling_group(t, stack, "WebServerGroup")
        stack.resources["WebServerGroup"] = resource
        self.assertEqual("WebServerGroup-0", resource.resource_id)

        # Scale up one
        self._stub_lb_reload(["WebServerGroup-0", "WebServerGroup-1"])
        self._stub_meta_expected(now, "ChangeInCapacity : 1", 2)
        self._stub_create(1)
        self.m.ReplayAll()
        up_policy = self.create_scaling_policy(t, stack, "WebServerScaleUpPolicy")
        up_policy.alarm()
        self.assertEqual("WebServerGroup-0,WebServerGroup-1", resource.resource_id)

        # Now move time on 10 seconds - Cooldown in template is 60
        # so this should not update the policy metadata, and the
        # scaling group instances should be unchanged
        # Note we have to stub Metadata.__get__ since up_policy isn't
        # stored in the DB (because the stack hasn't really been created)
        previous_meta = {timeutils.strtime(now): "ChangeInCapacity : 1"}

        self.m.VerifyAll()
        self.m.UnsetStubs()

        now = now + datetime.timedelta(seconds=10)
        self.m.StubOutWithMock(timeutils, "utcnow")
        timeutils.utcnow().AndReturn(now)

        self.m.StubOutWithMock(Metadata, "__get__")
        Metadata.__get__(mox.IgnoreArg(), up_policy, mox.IgnoreArg()).AndReturn(previous_meta)

        self.m.ReplayAll()
        up_policy.alarm()
        self.assertEqual("WebServerGroup-0,WebServerGroup-1", resource.resource_id)

        resource.delete()
        self.m.VerifyAll()

    def test_scaling_group_cooldown_ok(self):
        t = template_format.parse(as_template)
        stack = parse_stack(t)

        # Create initial group, 2 instances, Cooldown 60s
        properties = t["Resources"]["WebServerGroup"]["Properties"]
        properties["DesiredCapacity"] = "2"
        properties["Cooldown"] = "60"
        self._stub_lb_reload(["WebServerGroup-0", "WebServerGroup-1"])
        self._stub_create(2)
        now = timeutils.utcnow()
        self._stub_meta_expected(now, "ExactCapacity : 2")
        self.m.ReplayAll()
        resource = self.create_scaling_group(t, stack, "WebServerGroup")
        stack.resources["WebServerGroup"] = resource
        self.assertEqual("WebServerGroup-0,WebServerGroup-1", resource.resource_id)

        # reduce by 50%
        self._stub_lb_reload(["WebServerGroup-0"])
        self._stub_meta_expected(now, "PercentChangeInCapacity : -50")
        self.m.ReplayAll()
        resource.adjust(-50, "PercentChangeInCapacity")
        self.assertEqual("WebServerGroup-0", resource.resource_id)

        # Now move time on 61 seconds - Cooldown in template is 60
        # so this should update the policy metadata, and the
        # scaling group instances updated
        previous_meta = {timeutils.strtime(now): "PercentChangeInCapacity : -50"}

        self.m.VerifyAll()
        self.m.UnsetStubs()

        now = now + datetime.timedelta(seconds=61)

        self.m.StubOutWithMock(Metadata, "__get__")
        Metadata.__get__(mox.IgnoreArg(), resource, mox.IgnoreArg()).AndReturn(previous_meta)

        # raise by 200%, should work
        self._stub_lb_reload(["WebServerGroup-0", "WebServerGroup-1", "WebServerGroup-2"], unset=False)
        self._stub_create(2)
        self._stub_meta_expected(now, "PercentChangeInCapacity : 200")
        self.m.ReplayAll()
        resource.adjust(200, "PercentChangeInCapacity")
        self.assertEqual("WebServerGroup-0,WebServerGroup-1,WebServerGroup-2", resource.resource_id)

        resource.delete()