236 lines
9.5 KiB
Python
236 lines
9.5 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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#
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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 json
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from requests import exceptions
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from heat.common import exception
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from heat.common import template_format
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from heat.common import urlfetch
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from heat.engine import attributes
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from heat.engine import environment
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from heat.engine import properties
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from heat.engine import stack_resource
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from heat.engine import template
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from heat.openstack.common import log as logging
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logger = logging.getLogger(__name__)
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class TemplateResource(stack_resource.StackResource):
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'''
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A resource implemented by a nested stack.
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This implementation passes resource properties as parameters to the nested
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stack. Outputs of the nested stack are exposed as attributes of this
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resource.
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'''
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def __init__(self, name, json_snippet, stack):
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self._parsed_nested = None
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self.stack = stack
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self.validation_exception = None
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self.update_allowed_keys = ('Properties',)
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tri = stack.env.get_resource_info(
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json_snippet['Type'],
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registry_type=environment.TemplateResourceInfo)
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if tri is None:
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self.validation_exception = ValueError(_(
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'Only Templates with an extension of .yaml or '
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'.template are supported'))
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else:
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self.template_name = tri.template_name
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if tri.user_resource:
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self.allowed_schemes = ('http', 'https')
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else:
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self.allowed_schemes = ('http', 'https', 'file')
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# run Resource.__init__() so we can call self.nested()
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self.properties_schema = {}
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self.attributes_schema = {}
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super(TemplateResource, self).__init__(name, json_snippet, stack)
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if self.validation_exception is None:
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self._generate_schema(self.t.get('Properties', {}))
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def _generate_schema(self, props):
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self._parsed_nested = None
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try:
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tmpl = template.Template(self.parsed_nested())
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except ValueError as download_error:
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self.validation_exception = download_error
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tmpl = template.Template({})
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# re-generate the properties and attributes from the template.
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self.properties_schema = (properties.Properties
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.schema_from_params(tmpl.param_schemata()))
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self.attributes_schema = (attributes.Attributes
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.schema_from_outputs(tmpl[template.OUTPUTS]))
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self.properties = properties.Properties(self.properties_schema,
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props,
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self._resolve_runtime_data,
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self.name)
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self.attributes = attributes.Attributes(self.name,
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self.attributes_schema,
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self._resolve_attribute)
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def _to_parameters(self):
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'''
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:return: parameter values for our nested stack based on our properties
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'''
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params = {}
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for pname, pval in iter(self.properties.props.items()):
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if not pval.implemented():
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continue
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val = self.properties[pname]
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if val is not None:
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# take a list and create a CommaDelimitedList
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if pval.type() == properties.Schema.LIST:
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if len(val) == 0:
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params[pname] = ''
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elif isinstance(val[0], dict):
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flattened = []
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for (count, item) in enumerate(val):
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for (ik, iv) in iter(item.items()):
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mem_str = '.member.%d.%s=%s' % (count, ik, iv)
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flattened.append(mem_str)
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params[pname] = ','.join(flattened)
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else:
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params[pname] = ','.join(val)
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else:
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# for MAP, the JSON param takes either a collection or
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# string, so just pass it on and let the param validate
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# as appropriate
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params[pname] = val
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return params
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def parsed_nested(self):
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if not self._parsed_nested:
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self._parsed_nested = template_format.parse(self.template_data())
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return self._parsed_nested
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def template_data(self):
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# we want to have the latest possible template.
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# 1. look in files
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# 2. try download
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# 3. look in the db
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reported_excp = None
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t_data = self.stack.t.files.get(self.template_name)
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if not t_data and self.template_name.endswith((".yaml", ".template")):
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try:
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t_data = urlfetch.get(self.template_name,
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allowed_schemes=self.allowed_schemes)
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except (exceptions.RequestException, IOError) as r_exc:
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reported_excp = ValueError(_("Could not fetch remote template "
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"'%(name)s': %(exc)s") % {
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'name': self.template_name,
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'exc': str(r_exc)})
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if t_data is None:
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if self.nested() is not None:
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t_data = json.dumps(self.nested().t.t)
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if t_data is not None:
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self.stack.t.files[self.template_name] = t_data
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return t_data
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if reported_excp is None:
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reported_excp = ValueError(_('Unknown error retrieving %s') %
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self.template_name)
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raise reported_excp
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def _validate_against_facade(self, facade_cls):
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facade_schemata = properties.schemata(facade_cls.properties_schema)
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for n, fs in facade_schemata.items():
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if fs.required and n not in self.properties_schema:
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msg = (_("Required property %(n)s for facade %(type)s "
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"missing in provider") % {'n': n, 'type': self.type()})
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raise exception.StackValidationFailed(message=msg)
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ps = self.properties_schema.get(n)
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if (n in self.properties_schema and
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(fs.type != ps.type)):
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# Type mismatch
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msg = (_("Property %(n)s type mismatch between facade %(type)s"
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" (%(fs_type)s) and provider (%(ps_type)s)") % {
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'n': n, 'type': self.type(),
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'fs_type': fs.type, 'ps_type': ps.type})
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raise exception.StackValidationFailed(message=msg)
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for n, ps in self.properties_schema.items():
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if ps.required and n not in facade_schemata:
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# Required property for template not present in facade
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msg = (_("Provider requires property %(n)s "
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"unknown in facade %(type)s") % {
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'n': n, 'type': self.type()})
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raise exception.StackValidationFailed(message=msg)
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for attr in facade_cls.attributes_schema:
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if attr not in self.attributes_schema:
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msg = (_("Attribute %(attr)s for facade %(type)s "
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"missing in provider") % {
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'attr': attr, 'type': self.type()})
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raise exception.StackValidationFailed(message=msg)
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def validate(self):
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if self.validation_exception is not None:
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msg = str(self.validation_exception)
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raise exception.StackValidationFailed(message=msg)
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try:
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self.template_data()
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except ValueError as ex:
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msg = _("Failed to retrieve template data: %s") % str(ex)
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raise exception.StackValidationFailed(message=msg)
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cri = self.stack.env.get_resource_info(
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self.type(),
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registry_type=environment.ClassResourceInfo)
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# If we're using an existing resource type as a facade for this
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# template, check for compatibility between the interfaces.
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if cri is not None and not isinstance(self, cri.get_class()):
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facade_cls = cri.get_class()
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self._validate_against_facade(facade_cls)
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return super(TemplateResource, self).validate()
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def handle_create(self):
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return self.create_with_template(self.parsed_nested(),
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self._to_parameters())
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def handle_update(self, json_snippet, tmpl_diff, prop_diff):
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# The stack template may be changed even if the prop_diff is empty.
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self.properties = properties.Properties(
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self.properties_schema,
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json_snippet.get('Properties', {}),
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self.stack.resolve_runtime_data,
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self.name)
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return self.update_with_template(self.parsed_nested(),
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self._to_parameters())
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def handle_delete(self):
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return self.delete_nested()
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def FnGetRefId(self):
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if not self.nested():
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return unicode(self.name)
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return self.nested().identifier().arn()
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