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OpenStack Study: evacuate.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 oslo.config import cfg from webob import exc from nova.api.openstack import common from nova.api.openstack.compute.schemas.v3 import evacuate from nova.api.openstack import extensions from nova.api.openstack import wsgi from nova.api import validation from nova import compute from nova import exception from nova.openstack.common.gettextutils import _ from nova.openstack.common import log as logging from nova.openstack.common import strutils from nova import utils CONF = cfg.CONF CONF.import_opt('enable_instance_password', 'nova.api.openstack.compute.servers') LOG = logging.getLogger(__name__) ALIAS = "os-evacuate" authorize = extensions.extension_authorizer('compute', 'v3:' + ALIAS)
**** CubicPower OpenStack Study **** class EvacuateController(wsgi.Controller):
**** CubicPower OpenStack Study **** def __init__(self, *args, **kwargs): super(EvacuateController, self).__init__(*args, **kwargs) self.compute_api = compute.API() self.host_api = compute.HostAPI() @wsgi.response(202) @extensions.expected_errors((400, 404, 409)) @wsgi.action('evacuate') @validation.schema(evacuate.evacuate)
**** CubicPower OpenStack Study **** def _evacuate(self, req, id, body): """Permit admins to evacuate a server from a failed host to a new one. """ context = req.environ["nova.context"] authorize(context) evacuate_body = body["evacuate"] host = evacuate_body["host"] on_shared_storage = strutils.bool_from_string( evacuate_body["on_shared_storage"]) password = None if 'admin_password' in evacuate_body: # check that if requested to evacuate server on shared storage # password not specified if on_shared_storage: msg = _("admin password can't be changed on existing disk") raise exc.HTTPBadRequest(explanation=msg) password = evacuate_body['admin_password'] elif not on_shared_storage: password = utils.generate_password() try: self.host_api.service_get_by_compute_host(context, host) except exception.NotFound: msg = _("Compute host %s not found.") % host raise exc.HTTPNotFound(explanation=msg) instance = common.get_instance(self.compute_api, context, id) try: self.compute_api.evacuate(context, instance, host, on_shared_storage, password) except exception.InstanceInvalidState as state_error: common.raise_http_conflict_for_instance_invalid_state(state_error, 'evacuate') except exception.ComputeServiceInUse as e: raise exc.HTTPBadRequest(explanation=e.format_message()) if CONF.enable_instance_password: return {'admin_password': password} else: return {}
**** CubicPower OpenStack Study **** class Evacuate(extensions.V3APIExtensionBase): """Enables server evacuation.""" name = "Evacuate" alias = ALIAS version = 1
**** CubicPower OpenStack Study **** def get_resources(self): return []
**** CubicPower OpenStack Study **** def get_controller_extensions(self): controller = EvacuateController() extension = extensions.ControllerExtension(self, 'servers', controller) return [extension]
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