353 lines
13 KiB
Python
353 lines
13 KiB
Python
#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import collections
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import copy
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import six
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from heat.common import exception
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from heat.common import grouputils
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from heat.common.i18n import _
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from heat.engine import attributes
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from heat.engine import constraints
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from heat.engine import properties
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from heat.engine.resources import stack_resource
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from heat.engine import support
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from heat.engine import template
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template_template = {
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"heat_template_version": "2013-05-23",
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"resources": {}
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}
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class ResourceGroup(stack_resource.StackResource):
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"""
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A resource that creates one or more identically configured nested
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resources.
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In addition to the `refs` attribute, this resource implements synthetic
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attributes that mirror those of the resources in the group. When
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getting an attribute from this resource, however, a list of attribute
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values for each resource in the group is returned. To get attribute values
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for a single resource in the group, synthetic attributes of the form
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`resource.{resource index}.{attribute name}` can be used. The resource ID
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of a particular resource in the group can be obtained via the synthetic
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attribute `resource.{resource index}`.
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While each resource in the group will be identically configured, this
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resource does allow for some index-based customization of the properties
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of the resources in the group. For example::
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resources:
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my_indexed_group:
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type: OS::Heat::ResourceGroup
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properties:
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count: 3
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resource_def:
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type: OS::Nova::Server
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properties:
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# create a unique name for each server
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# using its index in the group
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name: my_server_%index%
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image: CentOS 6.5
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flavor: 4GB Performance
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would result in a group of three servers having the same image and flavor,
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but names of `my_server_0`, `my_server_1`, and `my_server_2`. The variable
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used for substitution can be customized by using the `index_var` property.
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"""
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support_status = support.SupportStatus(version='2014.1')
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PROPERTIES = (
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COUNT, INDEX_VAR, RESOURCE_DEF, REMOVAL_POLICIES
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) = (
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'count', 'index_var', 'resource_def', 'removal_policies'
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)
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_RESOURCE_DEF_KEYS = (
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RESOURCE_DEF_TYPE, RESOURCE_DEF_PROPERTIES,
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) = (
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'type', 'properties',
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)
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_REMOVAL_POLICIES_KEYS = (
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REMOVAL_RSRC_LIST,
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) = (
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'resource_list',
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)
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ATTRIBUTES = (
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REFS, ATTR_ATTRIBUTES,
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) = (
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'refs', 'attributes',
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)
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properties_schema = {
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COUNT: properties.Schema(
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properties.Schema.INTEGER,
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_('The number of instances to create.'),
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default=1,
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constraints=[
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constraints.Range(min=0),
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],
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update_allowed=True
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),
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INDEX_VAR: properties.Schema(
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properties.Schema.STRING,
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_('A variable that this resource will use to replace with the '
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'current index of a given resource in the group. Can be used, '
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'for example, to customize the name property of grouped '
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'servers in order to differentiate them when listed with '
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'nova client.'),
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default="%index%",
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constraints=[
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constraints.Length(min=3)
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],
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support_status=support.SupportStatus(version='2014.2')
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),
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RESOURCE_DEF: properties.Schema(
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properties.Schema.MAP,
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_('Resource definition for the resources in the group. The value '
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'of this property is the definition of a resource just as if '
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'it had been declared in the template itself.'),
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schema={
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RESOURCE_DEF_TYPE: properties.Schema(
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properties.Schema.STRING,
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_('The type of the resources in the group'),
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required=True
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),
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RESOURCE_DEF_PROPERTIES: properties.Schema(
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properties.Schema.MAP,
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_('Property values for the resources in the group')
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),
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},
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required=True,
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update_allowed=True
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),
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REMOVAL_POLICIES: properties.Schema(
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properties.Schema.LIST,
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_('Policies for removal of resources on update'),
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schema=properties.Schema(
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properties.Schema.MAP,
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_('Policy to be processed when doing an update which '
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'requires removal of specific resources.'),
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schema={
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REMOVAL_RSRC_LIST: properties.Schema(
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properties.Schema.LIST,
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_("List of resources to be removed "
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"when doing an update which requires removal of "
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"specific resources. "
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"The resource may be specified several ways: "
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"(1) The resource name, as in the nested stack, "
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"(2) The resource reference returned from "
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"get_resource in a template, as available via "
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"the 'refs' attribute "
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"Note this is destructive on update when specified; "
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"even if the count is not being reduced, and once "
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"a resource name is removed, it's name is never "
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"reused in subsequent updates"
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),
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default=[]
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),
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},
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),
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update_allowed=True,
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default=[],
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support_status=support.SupportStatus(version='2015.1')
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),
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}
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attributes_schema = {
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REFS: attributes.Schema(
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_("A list of resource IDs for the resources in the group")
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),
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ATTR_ATTRIBUTES: attributes.Schema(
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_("A map of resource names to the specified attribute of each "
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"individual resource. "
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"Requires heat_template_version: 2014-10-16."),
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support_status=support.SupportStatus(version='2014.2')
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),
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}
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def validate_nested_stack(self):
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# Only validate the resource definition (which may be a
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# nested template) if count is non-zero, to enable folks
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# to disable features via a zero count if they wish
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if not self.properties.get(self.COUNT):
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return
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test_tmpl = self._assemble_nested(["0"], include_all=True)
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val_templ = template.Template(test_tmpl)
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res_def = val_templ.resource_definitions(self.stack)["0"]
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# make sure we can resolve the nested resource type
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try:
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self.stack.env.get_class(res_def.resource_type)
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except exception.TemplateNotFound:
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# its a template resource
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pass
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try:
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name = "%s-%s" % (self.stack.name, self.name)
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nested_stack = self._parse_nested_stack(
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name,
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test_tmpl,
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self.child_params())
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nested_stack.strict_validate = False
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nested_stack.validate()
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except Exception as ex:
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msg = _("Failed to validate: %s") % six.text_type(ex)
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raise exception.StackValidationFailed(message=msg)
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def _name_blacklist(self):
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"""Resolve the remove_policies to names for removal."""
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# To avoid reusing names after removal, we store a comma-separated
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# blacklist in the resource data
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db_rsrc_names = self.data().get('name_blacklist')
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if db_rsrc_names:
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current_blacklist = db_rsrc_names.split(',')
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else:
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current_blacklist = []
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# Now we iterate over the removal policies, and update the blacklist
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# with any additional names
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rsrc_names = list(current_blacklist)
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for r in self.properties[self.REMOVAL_POLICIES]:
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if self.REMOVAL_RSRC_LIST in r:
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# Tolerate string or int list values
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for n in r[self.REMOVAL_RSRC_LIST]:
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str_n = six.text_type(n)
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if str_n in self.nested() and str_n not in rsrc_names:
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rsrc_names.append(str_n)
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continue
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rsrc = self.nested().resource_by_refid(str_n)
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if rsrc and str_n not in rsrc_names:
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rsrc_names.append(rsrc.name)
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# If the blacklist has changed, update the resource data
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if rsrc_names != current_blacklist:
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self.data_set('name_blacklist', ','.join(rsrc_names))
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return rsrc_names
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def _resource_names(self):
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name_blacklist = self._name_blacklist()
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req_count = self.properties.get(self.COUNT)
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def gen_names():
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count = 0
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index = 0
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while count < req_count:
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if str(index) not in name_blacklist:
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yield str(index)
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count += 1
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index += 1
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return list(gen_names())
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def handle_create(self):
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names = self._resource_names()
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return self.create_with_template(self._assemble_nested(names),
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{}, self.stack.timeout_mins)
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def handle_update(self, json_snippet, tmpl_diff, prop_diff):
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self.properties = json_snippet.properties(self.properties_schema,
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self.context)
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new_names = self._resource_names()
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return self.update_with_template(self._assemble_nested(new_names),
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{},
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self.stack.timeout_mins)
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def handle_delete(self):
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return self.delete_nested()
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def FnGetAtt(self, key, *path):
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if key.startswith("resource."):
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return grouputils.get_nested_attrs(self, key, False, *path)
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names = self._resource_names()
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if key == self.REFS:
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vals = [grouputils.get_rsrc_id(self, key, False, n) for n in names]
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return attributes.select_from_attribute(vals, path)
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if key == self.ATTR_ATTRIBUTES:
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if not path:
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raise exception.InvalidTemplateAttribute(
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resource=self.name, key=key)
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return dict((n, grouputils.get_rsrc_attr(
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self, key, False, n, *path)) for n in names)
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path = [key] + list(path)
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return [grouputils.get_rsrc_attr(self, key, False, n, *path)
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for n in names]
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def _build_resource_definition(self, include_all=False):
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res_def = self.properties[self.RESOURCE_DEF]
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if res_def[self.RESOURCE_DEF_PROPERTIES] is None:
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res_def[self.RESOURCE_DEF_PROPERTIES] = {}
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if not include_all:
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resource_def_props = res_def[self.RESOURCE_DEF_PROPERTIES]
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clean = dict((k, v) for k, v in resource_def_props.items()
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if v is not None)
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res_def[self.RESOURCE_DEF_PROPERTIES] = clean
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return res_def
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def _handle_repl_val(self, res_name, val):
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repl_var = self.properties[self.INDEX_VAR]
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recurse = lambda x: self._handle_repl_val(res_name, x)
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if isinstance(val, six.string_types):
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return val.replace(repl_var, res_name)
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elif isinstance(val, collections.Mapping):
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return dict(zip(val, map(recurse, six.itervalues(val))))
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elif isinstance(val, collections.Sequence):
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return map(recurse, val)
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return val
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def _do_prop_replace(self, res_name, res_def_template):
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res_def = copy.deepcopy(res_def_template)
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props = res_def[self.RESOURCE_DEF_PROPERTIES]
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if props:
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props = self._handle_repl_val(res_name, props)
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res_def[self.RESOURCE_DEF_PROPERTIES] = props
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return res_def
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def _assemble_nested(self, names, include_all=False):
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res_def = self._build_resource_definition(include_all)
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resources = dict((k, self._do_prop_replace(k, res_def))
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for k in names)
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child_template = copy.deepcopy(template_template)
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child_template['resources'] = resources
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return child_template
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def child_template(self):
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names = self._resource_names()
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return self._assemble_nested(names)
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def child_params(self):
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return {}
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def handle_adopt(self, resource_data):
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names = self._resource_names()
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if names:
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return self.create_with_template(self._assemble_nested(names),
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{},
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adopt_data=resource_data)
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def resource_mapping():
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return {
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'OS::Heat::ResourceGroup': ResourceGroup,
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}
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