heat/heat/tests/test_autoscaling.py

# 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 sys
import os

import nose
import unittest
import mox
import json

from nose.plugins.attrib import attr

from heat.common import context
from heat.engine import format
from heat.engine.resources import autoscaling as asc
from heat.engine.resources import loadbalancer
from heat.engine import parser


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

    def tearDown(self):
        self.m.UnsetStubs()
        print "AutoScalingTest teardown complete"

    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 = format.parse_to_template(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, stack_id=-1)

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

    def test_scaling_group(self):

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

        # start with min then delete
        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()

        # start with 3
        properties = t['Resources']['WebServerGroup']['Properties']
        properties['DesiredCapacity'] = '3'
        resource = self.create_scaling_group(t, stack, 'WebServerGroup')
        self.assertEqual('WebServerGroup-0,WebServerGroup-1,WebServerGroup-2',
                         resource.resource_id)

        # reduce to 1
        resource.adjust(-2)
        self.assertEqual('WebServerGroup-0', resource.resource_id)

        # raise to 3
        resource.adjust(2)
        self.assertEqual('WebServerGroup-0,WebServerGroup-1,WebServerGroup-2',
                         resource.resource_id)

        # set to 2
        resource.adjust(2, 'ExactCapacity')
        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)

        # reduce by 50%
        resource.adjust(-50, 'PercentChangeInCapacity')
        self.assertEqual('WebServerGroup-0',
                 resource.resource_id)

        # raise by 200%
        resource.adjust(200, 'PercentChangeInCapacity')
        self.assertEqual('WebServerGroup-0,WebServerGroup-1,WebServerGroup-2',
                 resource.resource_id)

        resource.delete()

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

        # start with min then delete
        resource = self.create_scaling_group(t, stack, 'WebServerGroup')
        stack.resources['WebServerGroup'] = resource

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

        up_policy = self.create_scaling_policy(t, stack,
                                               'WebServerScaleUpPolicy')
        up_policy.alarm()
        self.assertEqual('WebServerGroup-0,WebServerGroup-1',
                 resource.resource_id)

        down_policy = self.create_scaling_policy(t, stack,
                                                 'WebServerScaleDownPolicy')
        down_policy.alarm()
        self.assertEqual('WebServerGroup-0',
                 resource.resource_id)

        resource.delete()

    # allows testing of the test directly, shown below
    if __name__ == '__main__':
        sys.argv.append(__file__)
        nose.main()