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OpenStack Study: extended_server_attributes.py**** CubicPower OpenStack Study ****
# Copyright 2012 OpenStack Foundation # # 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. """The Extended Server Attributes API extension.""" from nova.api.openstack import extensions from nova.api.openstack import wsgi from nova.api.openstack import xmlutil authorize = extensions.soft_extension_authorizer('compute', 'extended_server_attributes')
**** CubicPower OpenStack Study **** class ExtendedServerAttributesController(wsgi.Controller):
**** CubicPower OpenStack Study **** def _extend_server(self, context, server, instance): key = "%s:hypervisor_hostname" % Extended_server_attributes.alias server[key] = instance['node'] for attr in ['host', 'name']: if attr == 'name': key = "%s:instance_%s" % (Extended_server_attributes.alias, attr) else: key = "%s:%s" % (Extended_server_attributes.alias, attr) server[key] = instance[attr] @wsgi.extends
**** CubicPower OpenStack Study **** def show(self, req, resp_obj, id): context = req.environ['nova.context'] if authorize(context): # Attach our slave template to the response object resp_obj.attach(xml=ExtendedServerAttributeTemplate()) server = resp_obj.obj['server'] db_instance = req.get_db_instance(server['id']) # server['id'] is guaranteed to be in the cache due to # the core API adding it in its 'show' method. self._extend_server(context, server, db_instance) @wsgi.extends
**** CubicPower OpenStack Study **** def detail(self, req, resp_obj): context = req.environ['nova.context'] if authorize(context): # Attach our slave template to the response object resp_obj.attach(xml=ExtendedServerAttributesTemplate()) servers = list(resp_obj.obj['servers']) for server in servers: db_instance = req.get_db_instance(server['id']) # server['id'] is guaranteed to be in the cache due to # the core API adding it in its 'detail' method. self._extend_server(context, server, db_instance)
**** CubicPower OpenStack Study **** class Extended_server_attributes(extensions.ExtensionDescriptor): """Extended Server Attributes support.""" name = "ExtendedServerAttributes" alias = "OS-EXT-SRV-ATTR" namespace = ("http://docs.openstack.org/compute/ext/" "extended_status/api/v1.1") updated = "2011-11-03T00:00:00+00:00"
**** CubicPower OpenStack Study **** def get_controller_extensions(self): controller = ExtendedServerAttributesController() extension = extensions.ControllerExtension(self, 'servers', controller) return [extension] def make_server(elem): elem.set('{%s}instance_name' % Extended_server_attributes.namespace, '%s:instance_name' % Extended_server_attributes.alias) elem.set('{%s}host' % Extended_server_attributes.namespace, '%s:host' % Extended_server_attributes.alias) elem.set('{%s}hypervisor_hostname' % Extended_server_attributes.namespace, '%s:hypervisor_hostname' % Extended_server_attributes.alias)
**** CubicPower OpenStack Study **** def make_server(elem): elem.set('{%s}instance_name' % Extended_server_attributes.namespace, '%s:instance_name' % Extended_server_attributes.alias) elem.set('{%s}host' % Extended_server_attributes.namespace, '%s:host' % Extended_server_attributes.alias) elem.set('{%s}hypervisor_hostname' % Extended_server_attributes.namespace, '%s:hypervisor_hostname' % Extended_server_attributes.alias)
**** CubicPower OpenStack Study **** class ExtendedServerAttributeTemplate(xmlutil.TemplateBuilder):
**** CubicPower OpenStack Study **** def construct(self): root = xmlutil.TemplateElement('server', selector='server') make_server(root) alias = Extended_server_attributes.alias namespace = Extended_server_attributes.namespace return xmlutil.SlaveTemplate(root, 1, nsmap={alias: namespace})
**** CubicPower OpenStack Study **** class ExtendedServerAttributesTemplate(xmlutil.TemplateBuilder):
**** CubicPower OpenStack Study **** def construct(self): root = xmlutil.TemplateElement('servers') elem = xmlutil.SubTemplateElement(root, 'server', selector='servers') make_server(elem) alias = Extended_server_attributes.alias namespace = Extended_server_attributes.namespace return xmlutil.SlaveTemplate(root, 1, nsmap={alias: namespace})
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