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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2011 OpenStack LLC.
# 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 compute
from nova import exception
class Controller(object):
""" The server metadata API controller for the OpenStack API """
def __init__(self):
self.compute_api = compute.API()
super(Controller, self).__init__()
def _get_metadata(self, context, server_id):
try:
server = self.compute_api.get(context, server_id)
meta = self.compute_api.get_instance_metadata(context, server)
except exception.InstanceNotFound:
msg = _('Server does not exist')
raise exc.HTTPNotFound(explanation=msg)
meta_dict = {}
for key, value in meta.iteritems():
meta_dict[key] = value
return meta_dict
@wsgi.serializers(xml=common.MetadataTemplate)
def index(self, req, server_id):
""" Returns the list of metadata for a given instance """
context = req.environ['nova.context']
return {'metadata': self._get_metadata(context, server_id)}
@wsgi.serializers(xml=common.MetadataTemplate)
@wsgi.deserializers(xml=common.MetadataDeserializer)
def create(self, req, server_id, body):
try:
metadata = body['metadata']
except (KeyError, TypeError):
msg = _("Malformed request body")
raise exc.HTTPBadRequest(explanation=msg)
context = req.environ['nova.context']
new_metadata = self._update_instance_metadata(context,
server_id,
metadata,
delete=False)
return {'metadata': new_metadata}
@wsgi.serializers(xml=common.MetaItemTemplate)
@wsgi.deserializers(xml=common.MetaItemDeserializer)
def update(self, req, server_id, id, body):
try:
meta_item = body['meta']
except (TypeError, KeyError):
expl = _('Malformed request body')
raise exc.HTTPBadRequest(explanation=expl)
if id not in meta_item:
expl = _('Request body and URI mismatch')
raise exc.HTTPBadRequest(explanation=expl)
if len(meta_item) > 1:
expl = _('Request body contains too many items')
raise exc.HTTPBadRequest(explanation=expl)
context = req.environ['nova.context']
self._update_instance_metadata(context,
server_id,
meta_item,
delete=False)
return {'meta': meta_item}
@wsgi.serializers(xml=common.MetadataTemplate)
@wsgi.deserializers(xml=common.MetadataDeserializer)
def update_all(self, req, server_id, body):
try:
metadata = body['metadata']
except (TypeError, KeyError):
expl = _('Malformed request body')
raise exc.HTTPBadRequest(explanation=expl)
context = req.environ['nova.context']
new_metadata = self._update_instance_metadata(context,
server_id,
metadata,
delete=True)
return {'metadata': new_metadata}
def _update_instance_metadata(self, context, server_id, metadata,
delete=False):
try:
server = self.compute_api.get(context, server_id)
return self.compute_api.update_instance_metadata(context,
server,
metadata,
delete)
except exception.InstanceNotFound:
msg = _('Server does not exist')
raise exc.HTTPNotFound(explanation=msg)
except (ValueError, AttributeError):
msg = _("Malformed request body")
raise exc.HTTPBadRequest(explanation=msg)
except exception.InvalidMetadata as error:
raise exc.HTTPBadRequest(explanation=unicode(error))
except exception.InvalidMetadataSize as error:
raise exc.HTTPRequestEntityTooLarge(explanation=unicode(error))
except exception.QuotaError as error:
raise exc.HTTPRequestEntityTooLarge(explanation=unicode(error),
headers={'Retry-After': 0})
@wsgi.serializers(xml=common.MetaItemTemplate)
def show(self, req, server_id, id):
""" Return a single metadata item """
context = req.environ['nova.context']
data = self._get_metadata(context, server_id)
try:
return {'meta': {id: data[id]}}
except KeyError:
msg = _("Metadata item was not found")
raise exc.HTTPNotFound(explanation=msg)
@wsgi.response(204)
def delete(self, req, server_id, id):
""" Deletes an existing metadata """
context = req.environ['nova.context']
metadata = self._get_metadata(context, server_id)
if id not in metadata:
msg = _("Metadata item was not found")
raise exc.HTTPNotFound(explanation=msg)
try:
server = self.compute_api.get(context, server_id)
self.compute_api.delete_instance_metadata(context, server, id)
except exception.InstanceNotFound:
msg = _('Server does not exist')
raise exc.HTTPNotFound(explanation=msg)
def create_resource():
return wsgi.Resource(Controller())
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