53 lines
2.0 KiB
Python
53 lines
2.0 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012 Cloudbase Solutions Srl
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from cloudbaseinit.openstack.common import cfg
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from cloudbaseinit.openstack.common import log as logging
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from cloudbaseinit.utils import classloader
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opts = [
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cfg.ListOpt('metadata_services',
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default=[
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'cloudbaseinit.metadata.services.httpservice.HttpService',
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'cloudbaseinit.metadata.services.configdrive.configdrive.'
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'ConfigDriveService',
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'cloudbaseinit.metadata.services.ec2service.EC2Service'
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],
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help='List of enabled metadata service classes, '
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'to be tested fro availability in the provided order. '
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'The first available service will be used to retrieve '
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'metadata')
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]
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CONF = cfg.CONF
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CONF.register_opts(opts)
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LOG = logging.getLogger(__name__)
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class MetadataServiceFactory(object):
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def get_metadata_service(self):
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# Return the first service that loads correctly
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cl = classloader.ClassLoader()
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for class_path in CONF.metadata_services:
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service = cl.load_class(class_path)()
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try:
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if service.load():
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return service
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except Exception, ex:
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LOG.error('Failed to load metadata service \'%(class_path)s\'')
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LOG.exception(ex)
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raise Exception("No available service found")
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