OpenStack Study: extended_server_attributes.py

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# 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

ALIAS = "os-extended-server-attributes"

authorize = extensions.soft_extension_authorizer('compute', 'v3:' + ALIAS)

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class ExtendedServerAttributesController(wsgi.Controller):

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    def _extend_server(self, context, server, instance):

        key = "%s:hypervisor_hostname" % ExtendedServerAttributes.alias

        server[key] = instance['node']

        for attr in ['host', 'name']:

            if attr == 'name':

                key = "%s:instance_%s" % (ExtendedServerAttributes.alias,

                                          attr)

            else:

                key = "%s:%s" % (ExtendedServerAttributes.alias, attr)

            server[key] = instance[attr]

    @wsgi.extends

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    def show(self, req, resp_obj, id):

        context = req.environ['nova.context']

        if authorize(context):

            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

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    def detail(self, req, resp_obj):

        context = req.environ['nova.context']

        if authorize(context):

            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)

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class ExtendedServerAttributes(extensions.V3APIExtensionBase):

"""Extended Server Attributes support."""

name = "ExtendedServerAttributes"

alias = ALIAS

version = 1

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    def get_controller_extensions(self):

        controller = ExtendedServerAttributesController()

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

        return [extension]

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    def get_resources(self):

        return []