~ubuntu-branches/ubuntu/raring/nova/raring-proposed

#   Copyright 2011 OpenStack, LLC.

#

#   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 Status Admin API extension."""

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', 'extended_status')

class ExtendedStatusController(wsgi.Controller):

    def __init__(self, *args, **kwargs):

        super(ExtendedStatusController, self).__init__(*args, **kwargs)

        self.compute_api = compute.API()

    def _extend_server(self, server, instance):

        for state in ['task_state', 'vm_state', 'power_state']:

            key = "%s:%s" % (Extended_status.alias, state)

            server[key] = instance[state]

    @wsgi.extends

    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=ExtendedStatusTemplate())

            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

    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=ExtendedStatusesTemplate())

            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)

class Extended_status(extensions.ExtensionDescriptor):

    """Extended Status support"""

    name = "ExtendedStatus"

    alias = "OS-EXT-STS"

    namespace = ("http://docs.openstack.org/compute/ext/"

                 "extended_status/api/v1.1")

    updated = "2011-11-03T00:00:00+00:00"

    def get_controller_extensions(self):

        controller = ExtendedStatusController()

        extension = extensions.ControllerExtension(self, 'servers', controller)

        return [extension]

def make_server(elem):

    elem.set('{%s}task_state' % Extended_status.namespace,

             '%s:task_state' % Extended_status.alias)

    elem.set('{%s}power_state' % Extended_status.namespace,

             '%s:power_state' % Extended_status.alias)

    elem.set('{%s}vm_state' % Extended_status.namespace,

             '%s:vm_state' % Extended_status.alias)

class ExtendedStatusTemplate(xmlutil.TemplateBuilder):

    def construct(self):

        root = xmlutil.TemplateElement('server', selector='server')

        make_server(root)

        return xmlutil.SlaveTemplate(root, 1, nsmap={

            Extended_status.alias: Extended_status.namespace})

class ExtendedStatusesTemplate(xmlutil.TemplateBuilder):

    def construct(self):

        root = xmlutil.TemplateElement('servers')

        elem = xmlutil.SubTemplateElement(root, 'server', selector='servers')

        make_server(elem)

        return xmlutil.SlaveTemplate(root, 1, nsmap={

            Extended_status.alias: Extended_status.namespace})