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OpenStack Study: flavorextradata.py

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# Copyright 2012 OpenStack Foundation

# Copyright 2011 Canonical Ltd.

# All Rights Reserved.

#

# 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 Flavor extra data extension

OpenStack API version 1.1 lists "name", "ram", "disk", "vcpus" as flavor

attributes. This extension adds to that list:

- OS-FLV-EXT-DATA:ephemeral

"""

from nova.api.openstack import extensions

from nova.api.openstack import wsgi

from nova.api.openstack import xmlutil

authorize = extensions.soft_extension_authorizer('compute', 'flavorextradata')

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class FlavorextradataController(wsgi.Controller):

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    def _extend_flavors(self, req, flavors):

        for flavor in flavors:

            db_flavor = req.get_db_flavor(flavor['id'])

            key = "%s:ephemeral" % Flavorextradata.alias

            flavor[key] = db_flavor['ephemeral_gb']

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    def _show(self, req, resp_obj):

        if not authorize(req.environ['nova.context']):

            return

        if 'flavor' in resp_obj.obj:

            resp_obj.attach(xml=FlavorextradatumTemplate())

            self._extend_flavors(req, [resp_obj.obj['flavor']])

    @wsgi.extends

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

        return self._show(req, resp_obj)

    @wsgi.extends(action='create')

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    def create(self, req, resp_obj, body):

        return self._show(req, resp_obj)

    @wsgi.extends

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    def detail(self, req, resp_obj):

        if not authorize(req.environ['nova.context']):

            return

        resp_obj.attach(xml=FlavorextradataTemplate())

        self._extend_flavors(req, list(resp_obj.obj['flavors']))

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class Flavorextradata(extensions.ExtensionDescriptor):

"""Provide additional data for flavors."""

name = "FlavorExtraData"

alias = "OS-FLV-EXT-DATA"

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

"flavor_extra_data/api/v1.1")

updated = "2011-09-14T00:00:00+00:00"

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    def get_controller_extensions(self):

        controller = FlavorextradataController()

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

        return [extension]

def make_flavor(elem):

    elem.set('{%s}ephemeral' % Flavorextradata.namespace,

             '%s:ephemeral' % Flavorextradata.alias)

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def make_flavor(elem):

    elem.set('{%s}ephemeral' % Flavorextradata.namespace,

             '%s:ephemeral' % Flavorextradata.alias)

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class FlavorextradatumTemplate(xmlutil.TemplateBuilder):

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    def construct(self):

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

        make_flavor(root)

        alias = Flavorextradata.alias

        namespace = Flavorextradata.namespace

        return xmlutil.SlaveTemplate(root, 1, nsmap={alias: namespace})

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class FlavorextradataTemplate(xmlutil.TemplateBuilder):

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    def construct(self):

        root = xmlutil.TemplateElement('flavors')

        elem = xmlutil.SubTemplateElement(root, 'flavor', selector='flavors')

        make_flavor(elem)

        alias = Flavorextradata.alias

        namespace = Flavorextradata.namespace

        return xmlutil.SlaveTemplate(root, 1, nsmap={alias: namespace})