OpenStack Study: scheduler_hints.py

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# Copyright 2011 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.

import webob.exc

from nova.api.openstack import extensions

from nova.openstack.common.gettextutils import _

ALIAS = "os-scheduler-hints"

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class SchedulerHints(extensions.V3APIExtensionBase):

"""Pass arbitrary key/value pairs to the scheduler."""

name = "SchedulerHints"

alias = ALIAS

version = 1

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    def get_controller_extensions(self):

        return []

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    def get_resources(self):

        return []

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    def server_create(self, server_dict, create_kwargs):

        scheduler_hints = server_dict.get(ALIAS + ':scheduler_hints', {})

        if not isinstance(scheduler_hints, dict):

            msg = _("Malformed scheduler_hints attribute")

            raise webob.exc.HTTPBadRequest(explanation=msg)

        create_kwargs['scheduler_hints'] = scheduler_hints