# vim: tabstop=4 shiftwidth=4 softtabstop=4

#    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 os
import datetime
import copy

import eventlet
import unittest
import mox

from nose.plugins.attrib import attr

from heat.common import context
from heat.common import template_format
from heat.engine.resources import autoscaling as asc
from heat.engine.resources import loadbalancer
from heat.engine.resources import instance
from heat.engine import parser
from heat.engine import scheduler
from heat.engine.resource import Metadata
from heat.openstack.common import timeutils
from heat.tests.utils import setup_dummy_db


@attr(tag=['unit', 'resource'])
@attr(speed='fast')
class AutoScalingTest(unittest.TestCase):
    def setUp(self):
        self.m = mox.Mox()
        setup_dummy_db()

    def tearDown(self):
        self.m.UnsetStubs()

    def load_template(self):
        self.path = os.path.dirname(os.path.realpath(__file__)).\
            replace('heat/tests', 'templates')
        f = open("%s/AutoScalingMultiAZSample.template" % self.path)
        t = template_format.parse(f.read())
        f.close()
        return t

    def parse_stack(self, t):
        ctx = context.RequestContext.from_dict({
            'tenant': 'test_tenant',
            'username': 'test_username',
            'password': 'password',
            'auth_url': 'http://localhost:5000/v2.0'})
        template = parser.Template(t)
        params = parser.Parameters('test_stack', template, {'KeyName': 'test'})
        stack = parser.Stack(ctx, 'test_stack', template, params)

        return stack

    def create_scaling_group(self, t, stack, resource_name):
        resource = asc.AutoScalingGroup(resource_name,
                                        t['Resources'][resource_name],
                                        stack)
        self.assertEqual(None, resource.validate())
        scheduler.TaskRunner(resource.create)()
        self.assertEqual(asc.AutoScalingGroup.CREATE_COMPLETE, resource.state)
        return resource

    def create_scaling_policy(self, t, stack, resource_name):
        resource = asc.ScalingPolicy(resource_name,
                                     t['Resources'][resource_name],
                                     stack)

        self.assertEqual(None, resource.validate())
        scheduler.TaskRunner(resource.create)()
        self.assertEqual(asc.ScalingPolicy.CREATE_COMPLETE,
                         resource.state)
        return resource

    def _stub_create(self, num):
        self.m.StubOutWithMock(eventlet, 'sleep')

        self.m.StubOutWithMock(instance.Instance, 'handle_create')
        self.m.StubOutWithMock(instance.Instance, 'check_active')
        cookie = object()
        for x in range(num):
            instance.Instance.handle_create().AndReturn(cookie)
        instance.Instance.check_active(cookie).AndReturn(False)
        eventlet.sleep(mox.IsA(int)).AndReturn(None)
        instance.Instance.check_active(cookie).MultipleTimes().AndReturn(True)

    def _stub_lb_reload(self, expected_list, unset=True):
        if unset:
            self.m.VerifyAll()
            self.m.UnsetStubs()
        self.m.StubOutWithMock(loadbalancer.LoadBalancer, 'reload')
        loadbalancer.LoadBalancer.reload(expected_list).AndReturn(None)

    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_group_update(self):
        t = self.load_template()
        stack = self.parse_stack(t)

        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')

        self.assertEqual('WebServerGroup', resource.FnGetRefId())
        self.assertEqual('WebServerGroup-0', resource.resource_id)
        self.assertEqual(asc.AutoScalingGroup.UPDATE_REPLACE,
                         resource.handle_update({}))

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

    def test_scaling_group_update_ok_maxsize(self):
        t = self.load_template()
        properties = t['Resources']['WebServerGroup']['Properties']
        properties['MinSize'] = '1'
        properties['MaxSize'] = '3'
        stack = self.parse_stack(t)

        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')
        self.assertEqual('WebServerGroup-0', resource.resource_id)

        # Reduce the max size to 2, should complete without adjusting
        update_snippet = copy.deepcopy(resource.parsed_template())
        update_snippet['Properties']['MaxSize'] = '2'
        self.assertEqual(asc.AutoScalingGroup.UPDATE_COMPLETE,
                         resource.handle_update(update_snippet))
        self.assertEqual('WebServerGroup-0', resource.resource_id)

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

    def test_scaling_group_update_ok_minsize(self):
        t = self.load_template()
        properties = t['Resources']['WebServerGroup']['Properties']
        properties['MinSize'] = '1'
        properties['MaxSize'] = '3'
        stack = self.parse_stack(t)

        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')
        self.assertEqual('WebServerGroup-0', resource.resource_id)

        # Increase min size to 2, should trigger an ExactCapacity adjust
        self._stub_lb_reload(['WebServerGroup-0', 'WebServerGroup-1'])
        self._stub_meta_expected(now, 'ExactCapacity : 2')
        self._stub_create(1)
        self.m.ReplayAll()

        update_snippet = copy.deepcopy(resource.parsed_template())
        update_snippet['Properties']['MinSize'] = '2'
        self.assertEqual(asc.AutoScalingGroup.UPDATE_COMPLETE,
                         resource.handle_update(update_snippet))
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         resource.resource_id)

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

    def test_scaling_group_update_ok_desired(self):
        t = self.load_template()
        properties = t['Resources']['WebServerGroup']['Properties']
        properties['MinSize'] = '1'
        properties['MaxSize'] = '3'
        stack = self.parse_stack(t)

        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')
        self.assertEqual('WebServerGroup-0', resource.resource_id)

        # Increase min size to 2 via DesiredCapacity, should adjust
        self._stub_lb_reload(['WebServerGroup-0', 'WebServerGroup-1'])
        self._stub_meta_expected(now, 'ExactCapacity : 2')
        self._stub_create(1)
        self.m.ReplayAll()

        update_snippet = copy.deepcopy(resource.parsed_template())
        update_snippet['Properties']['DesiredCapacity'] = '2'
        self.assertEqual(asc.AutoScalingGroup.UPDATE_COMPLETE,
                         resource.handle_update(update_snippet))
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         resource.resource_id)

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

    def test_scaling_group_update_ok_desired_remove(self):
        t = self.load_template()
        properties = t['Resources']['WebServerGroup']['Properties']
        properties['DesiredCapacity'] = '2'
        stack = self.parse_stack(t)

        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')
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         resource.resource_id)

        # Remove DesiredCapacity from the updated template, which should
        # have no effect, it's an optional parameter
        update_snippet = copy.deepcopy(resource.parsed_template())
        del(update_snippet['Properties']['DesiredCapacity'])
        self.assertEqual(asc.AutoScalingGroup.UPDATE_COMPLETE,
                         resource.handle_update(update_snippet))
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         resource.resource_id)

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

    def test_scaling_group_update_ok_cooldown(self):
        t = self.load_template()
        properties = t['Resources']['WebServerGroup']['Properties']
        properties['Cooldown'] = '60'
        stack = self.parse_stack(t)

        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')

        self.assertEqual('WebServerGroup', resource.FnGetRefId())
        self.assertEqual('WebServerGroup-0', resource.resource_id)
        update_snippet = copy.deepcopy(resource.parsed_template())
        old_cd = update_snippet['Properties']['Cooldown']
        update_snippet['Properties']['Cooldown'] = '61'
        self.assertEqual(asc.AutoScalingGroup.UPDATE_COMPLETE,
                         resource.handle_update(update_snippet))

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

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

        # start with 3
        properties = t['Resources']['WebServerGroup']['Properties']
        properties['DesiredCapacity'] = '3'
        self._stub_lb_reload(['WebServerGroup-0', 'WebServerGroup-1',
                              'WebServerGroup-2'])
        now = timeutils.utcnow()
        self._stub_meta_expected(now, 'ExactCapacity : 3')
        self._stub_create(3)
        self.m.ReplayAll()
        resource = self.create_scaling_group(t, stack, 'WebServerGroup')
        self.assertEqual('WebServerGroup-0,WebServerGroup-1,WebServerGroup-2',
                         resource.resource_id)

        # reduce to 1
        self._stub_lb_reload(['WebServerGroup-0'])
        self._stub_meta_expected(now, 'ChangeInCapacity : -2')
        self.m.ReplayAll()
        resource.adjust(-2)
        self.assertEqual('WebServerGroup-0', resource.resource_id)

        # raise to 3
        self._stub_lb_reload(['WebServerGroup-0', 'WebServerGroup-1',
                              'WebServerGroup-2'])
        self._stub_meta_expected(now, 'ChangeInCapacity : 2')
        self._stub_create(2)
        self.m.ReplayAll()
        resource.adjust(2)
        self.assertEqual('WebServerGroup-0,WebServerGroup-1,WebServerGroup-2',
                         resource.resource_id)

        # set to 2
        self._stub_lb_reload(['WebServerGroup-0', 'WebServerGroup-1'])
        self._stub_meta_expected(now, 'ExactCapacity : 2')
        self.m.ReplayAll()
        resource.adjust(2, 'ExactCapacity')
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         resource.resource_id)
        self.m.VerifyAll()

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

        # Create initial group, 2 instances
        properties = t['Resources']['WebServerGroup']['Properties']
        properties['DesiredCapacity'] = '2'
        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)

        # raise above the max
        resource.adjust(2)
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         resource.resource_id)

        # lower below the min
        resource.adjust(-2)
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         resource.resource_id)

        # no change
        resource.adjust(0)
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                         resource.resource_id)
        resource.delete()
        self.m.VerifyAll()

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

        # Create initial group, 2 instances
        properties = t['Resources']['WebServerGroup']['Properties']
        properties['DesiredCapacity'] = '2'
        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)

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

        resource.delete()

    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_group_cooldown_zero(self):
        t = self.load_template()
        stack = self.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()
        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)

        # 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(), 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_meta_expected(now, 'PercentChangeInCapacity : 200')
        self._stub_create(2)
        self.m.ReplayAll()
        resource.adjust(200, 'PercentChangeInCapacity')
        self.assertEqual('WebServerGroup-0,WebServerGroup-1,WebServerGroup-2',
                         resource.resource_id)

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

    def test_scaling_policy_up(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)

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

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

        # Create initial group, 2 instances
        properties = t['Resources']['WebServerGroup']['Properties']
        properties['DesiredCapacity'] = '2'
        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)

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

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

    def test_scaling_policy_cooldown_toosoon(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 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_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_policy_cooldown_zero(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 (with Cooldown=0) and scale up one
        properties = t['Resources']['WebServerScaleUpPolicy']['Properties']
        properties['Cooldown'] = '0'
        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 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_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()