OpenStack Study: image_metadata.py

**** CubicPower OpenStack Study ****

# Copyright 2011 OpenStack Foundation

# 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.

from webob import exc

from nova.api.openstack import common

from nova.api.openstack import wsgi

from nova import exception

from nova.image import glance

from nova.openstack.common.gettextutils import _

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class Controller(object):

"""The image metadata API controller for the OpenStack API."""

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    def __init__(self):

        self.image_service = glance.get_default_image_service()

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    def _get_image(self, context, image_id):

        try:

            return self.image_service.show(context, image_id)

        except exception.NotFound:

            msg = _("Image not found.")

            raise exc.HTTPNotFound(explanation=msg)

    @wsgi.serializers(xml=common.MetadataTemplate)

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    def index(self, req, image_id):

        """Returns the list of metadata for a given instance."""

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

        metadata = self._get_image(context, image_id)['properties']

        return dict(metadata=metadata)

    @wsgi.serializers(xml=common.MetaItemTemplate)

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

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

        metadata = self._get_image(context, image_id)['properties']

        if id in metadata:

            return {'meta': {id: metadata[id]}}

        else:

            raise exc.HTTPNotFound()

    @wsgi.serializers(xml=common.MetadataTemplate)

    @wsgi.deserializers(xml=common.MetadataDeserializer)

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

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

        image = self._get_image(context, image_id)

        if 'metadata' in body:

            for key, value in body['metadata'].iteritems():

                image['properties'][key] = value

        common.check_img_metadata_properties_quota(context,

                                                   image['properties'])

        try:

            image = self.image_service.update(context, image_id, image, None)

        except exception.ImageNotAuthorized as e:

            raise exc.HTTPForbidden(explanation=e.format_message())

        return dict(metadata=image['properties'])

    @wsgi.serializers(xml=common.MetaItemTemplate)

    @wsgi.deserializers(xml=common.MetaItemDeserializer)

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    def update(self, req, image_id, id, body):

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

        try:

            meta = body['meta']

        except KeyError:

            expl = _('Incorrect request body format')

            raise exc.HTTPBadRequest(explanation=expl)

        if id not in meta:

            expl = _('Request body and URI mismatch')

            raise exc.HTTPBadRequest(explanation=expl)

        if len(meta) > 1:

            expl = _('Request body contains too many items')

            raise exc.HTTPBadRequest(explanation=expl)

        image = self._get_image(context, image_id)

        image['properties'][id] = meta[id]

        common.check_img_metadata_properties_quota(context,

                                                   image['properties'])

        try:

            self.image_service.update(context, image_id, image, None)

        except exception.ImageNotAuthorized as e:

            raise exc.HTTPForbidden(explanation=e.format_message())

        return dict(meta=meta)

    @wsgi.serializers(xml=common.MetadataTemplate)

    @wsgi.deserializers(xml=common.MetadataDeserializer)

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    def update_all(self, req, image_id, body):

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

        image = self._get_image(context, image_id)

        metadata = body.get('metadata', {})

        common.check_img_metadata_properties_quota(context, metadata)

        image['properties'] = metadata

        try:

            self.image_service.update(context, image_id, image, None)

        except exception.ImageNotAuthorized as e:

            raise exc.HTTPForbidden(explanation=e.format_message())

        return dict(metadata=metadata)

    @wsgi.response(204)

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    def delete(self, req, image_id, id):

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

        image = self._get_image(context, image_id)

        if id not in image['properties']:

            msg = _("Invalid metadata key")

            raise exc.HTTPNotFound(explanation=msg)

        image['properties'].pop(id)

        try:

            self.image_service.update(context, image_id, image, None)

        except exception.ImageNotAuthorized as e:

            raise exc.HTTPForbidden(explanation=e.format_message())

def create_resource():

    return wsgi.Resource(Controller())

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def create_resource():

    return wsgi.Resource(Controller())