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OpenStack Study: rescue.py**** CubicPower OpenStack Study ****
# Copyright 2011 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 rescue mode extension.""" from oslo.config import cfg import webob from webob import exc from nova.api.openstack import common from nova.api.openstack.compute.schemas.v3 import rescue 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 import utils ALIAS = "os-rescue" CONF = cfg.CONF CONF.import_opt('enable_instance_password', 'nova.api.openstack.compute.servers') authorize = extensions.extension_authorizer('compute', 'v3:' + ALIAS)
**** CubicPower OpenStack Study **** class RescueController(wsgi.Controller):
**** CubicPower OpenStack Study **** def __init__(self, *args, **kwargs): super(RescueController, self).__init__(*args, **kwargs) self.compute_api = compute.API() @wsgi.response(202) @extensions.expected_errors((400, 404, 409, 501)) @wsgi.action('rescue') @validation.schema(rescue.rescue)
**** CubicPower OpenStack Study **** def _rescue(self, req, id, body): """Rescue an instance.""" context = req.environ["nova.context"] authorize(context) if body['rescue'] and 'admin_password' in body['rescue']: password = body['rescue']['admin_password'] else: password = utils.generate_password() instance = common.get_instance(self.compute_api, context, id, want_objects=True) try: self.compute_api.rescue(context, instance, rescue_password=password) except exception.InstanceInvalidState as state_error: common.raise_http_conflict_for_instance_invalid_state(state_error, 'rescue') except exception.InvalidVolume as volume_error: raise exc.HTTPConflict(explanation=volume_error.format_message()) except exception.InstanceNotRescuable as non_rescuable: raise exc.HTTPBadRequest( explanation=non_rescuable.format_message()) except NotImplementedError: msg = _("The rescue operation is not implemented by this cloud.") raise exc.HTTPNotImplemented(explanation=msg) if CONF.enable_instance_password: return {'admin_password': password} else: return {} @extensions.expected_errors((404, 409, 501)) @wsgi.action('unrescue')
**** CubicPower OpenStack Study **** def _unrescue(self, req, id, body): """Unrescue an instance.""" context = req.environ["nova.context"] authorize(context) instance = common.get_instance(self.compute_api, context, id, want_objects=True) try: self.compute_api.unrescue(context, instance) except exception.InstanceInvalidState as state_error: common.raise_http_conflict_for_instance_invalid_state(state_error, 'unrescue') except NotImplementedError: msg = _("The unrescue operation is not implemented by this cloud.") raise exc.HTTPNotImplemented(explanation=msg) return webob.Response(status_int=202)
**** CubicPower OpenStack Study **** class Rescue(extensions.V3APIExtensionBase): """Instance rescue mode.""" name = "Rescue" alias = ALIAS version = 1
**** CubicPower OpenStack Study **** def get_resources(self): return []
**** CubicPower OpenStack Study **** def get_controller_extensions(self): controller = RescueController() extension = extensions.ControllerExtension(self, 'servers', controller) return [extension]
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