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OpenStack Study: server_usage.py**** CubicPower OpenStack Study ****
# Copyright 2013 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. from nova.api.openstack import extensions from nova.api.openstack import wsgi from nova.api.openstack import xmlutil from nova import compute from nova.openstack.common import log as logging LOG = logging.getLogger(__name__) authorize = extensions.soft_extension_authorizer('compute', 'server_usage')
**** CubicPower OpenStack Study **** class ServerUsageController(wsgi.Controller):
**** CubicPower OpenStack Study **** def __init__(self, *args, **kwargs): super(ServerUsageController, self).__init__(*args, **kwargs) self.compute_api = compute.API()
**** CubicPower OpenStack Study **** def _extend_server(self, server, instance): for k in ['launched_at', 'terminated_at']: key = "%s:%s" % (Server_usage.alias, k) # NOTE(danms): Historically, this timestamp has been generated # merely by grabbing str(datetime) of a TZ-naive object. The # only way we can keep that with instance objects is to strip # the tzinfo from the stamp and str() it. server[key] = (instance[k].replace(tzinfo=None) if instance[k] else None) @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=ServerUsageTemplate()) 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(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=ServerUsagesTemplate()) 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(server, db_instance)
**** CubicPower OpenStack Study **** class Server_usage(extensions.ExtensionDescriptor): """Adds launched_at and terminated_at on Servers.""" name = "ServerUsage" alias = "OS-SRV-USG" namespace = ("http://docs.openstack.org/compute/ext/" "server_usage/api/v1.1") updated = "2013-04-29T00:00:00+00:00"
**** CubicPower OpenStack Study **** def get_controller_extensions(self): controller = ServerUsageController() extension = extensions.ControllerExtension(self, 'servers', controller) return [extension] def make_server(elem): elem.set('{%s}launched_at' % Server_usage.namespace, '%s:launched_at' % Server_usage.alias) elem.set('{%s}terminated_at' % Server_usage.namespace, '%s:terminated_at' % Server_usage.alias)
**** CubicPower OpenStack Study **** def make_server(elem): elem.set('{%s}launched_at' % Server_usage.namespace, '%s:launched_at' % Server_usage.alias) elem.set('{%s}terminated_at' % Server_usage.namespace, '%s:terminated_at' % Server_usage.alias)
**** CubicPower OpenStack Study **** class ServerUsageTemplate(xmlutil.TemplateBuilder):
**** CubicPower OpenStack Study **** def construct(self): root = xmlutil.TemplateElement('server', selector='server') make_server(root) return xmlutil.SlaveTemplate(root, 1, nsmap={ Server_usage.alias: Server_usage.namespace})
**** CubicPower OpenStack Study **** class ServerUsagesTemplate(xmlutil.TemplateBuilder):
**** CubicPower OpenStack Study **** def construct(self): root = xmlutil.TemplateElement('servers') elem = xmlutil.SubTemplateElement(root, 'server', selector='servers') make_server(elem) return xmlutil.SlaveTemplate(root, 1, nsmap={ Server_usage.alias: Server_usage.namespace})
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