# 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.resource import Metadata
from heat.openstack.common import timeutils
@attr(tag=['unit', 'resource'])
@attr(speed='fast')
[docs]class AutoScalingTest(unittest.TestCase):
[docs] def setUp(self):
self.m = mox.Mox()
[docs] def tearDown(self):
self.m.UnsetStubs()
print "AutoScalingTest teardown complete"
[docs] 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
[docs] 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
[docs] def create_scaling_group(self, t, stack, resource_name):
resource = asc.AutoScalingGroup(resource_name,
t['Resources'][resource_name],
stack)
self.assertEqual(None, resource.validate())
self.assertEqual(None, resource.create())
self.assertEqual(asc.AutoScalingGroup.CREATE_COMPLETE, resource.state)
return resource
[docs] def create_scaling_policy(self, t, stack, resource_name):
resource = asc.ScalingPolicy(resource_name,
t['Resources'][resource_name],
stack)
self.assertEqual(None, resource.validate())
self.assertEqual(None, 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, 'create')
self.m.StubOutWithMock(instance.Instance, 'check_active')
for x in range(num):
instance.Instance.create().AndReturn(None)
instance.Instance.check_active().AndReturn(False)
eventlet.sleep(mox.IsA(int)).AndReturn(None)
instance.Instance.check_active().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)
[docs] 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()
[docs] 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()
[docs] 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()
[docs] 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()
[docs] 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()
[docs] 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()
[docs] 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()
[docs] 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()
[docs] 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()
[docs] 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()
[docs] 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()
[docs] 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()
[docs] 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()
[docs] 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()
[docs] 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()
[docs] 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()
[docs] 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()
[docs] 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()