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# 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.
from heat.common import exception
from heat.common.i18n import _
from heat.engine import constraints
from heat.engine import properties
from heat.engine import resource
from heat.engine import support
NOVA_MICROVERSIONS = (MICROVERSION_SOFT_POLICIES, MICROVERSION_RULE) = ('2.15',
'2.64')
class ServerGroup(resource.Resource):
"""A resource for managing a Nova server group.
Server groups allow you to make sure instances (VM/VPS) are on the same
hypervisor host or on a different one.
"""
support_status = support.SupportStatus(version='2014.2')
default_client_name = 'nova'
entity = 'server_groups'
PROPERTIES = (
NAME, POLICIES, RULES
) = (
'name', 'policies', 'rules'
)
_RULES = (MAX_SERVER_PER_HOST) = ('max_server_per_host')
properties_schema = {
NAME: properties.Schema(
properties.Schema.STRING,
_('Server Group name.')
),
POLICIES: properties.Schema(
properties.Schema.LIST,
_('A list of exactly one policy to apply. '
'Defaults to anti-affinity.'),
default=['anti-affinity'],
constraints=[
constraints.AllowedValues(["anti-affinity", "affinity",
"soft-anti-affinity",
"soft-affinity"])
],
schema=properties.Schema(
properties.Schema.STRING,
),
),
RULES: properties.Schema(
properties.Schema.MAP,
_('Rules for a policy.'),
schema={
MAX_SERVER_PER_HOST: properties.Schema(
properties.Schema.NUMBER,
_('Maximum servers in a group on a given host. '
'Rule for anti-affinity policy.')
)
},
support_status=support.SupportStatus(version='17.0.0'),
),
}
def validate(self):
super(ServerGroup, self).validate()
policies = self.properties[self.POLICIES]
is_supported = self.client_plugin().is_version_supported(
MICROVERSION_SOFT_POLICIES)
if (('soft-affinity' in policies or
'soft-anti-affinity' in policies) and not is_supported):
msg = _('Required microversion for soft policies not supported.')
raise exception.StackValidationFailed(message=msg)
if self.properties[self.RULES]:
is_supported = self.client_plugin().is_version_supported(
MICROVERSION_RULE)
if not is_supported:
msg = _('Required microversion for rules not supported.')
raise exception.StackValidationFailed(message=msg)
def handle_create(self):
name = self.physical_resource_name()
policies = self.properties[self.POLICIES]
rules = self.properties[self.RULES]
rules_supported = self.client_plugin().is_version_supported(
MICROVERSION_RULE)
if rules_supported:
server_group = self.client().server_groups.create(
name=name, policy=policies[0], rules=rules)
else:
server_group = self.client().server_groups.create(
name=name, policies=policies)
self.resource_id_set(server_group.id)
def physical_resource_name(self):
name = self.properties[self.NAME]
if name:
return name
return super(ServerGroup, self).physical_resource_name()
def resource_mapping():
return {'OS::Nova::ServerGroup': ServerGroup}
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