8e8a37e26e
The concept of a reserved namespace for instance metadata is intended to support the Heat autoscaling use-case. When spinning up new instances in a autoscaling group, Heat will set some additional user metadata on the instances to identify their group membership. Previously, instance user metadata was not captured in the metering store and thus could not be queried on. Now the reserved namespace(s) are used to signal to the compute agent that some user metadata should not be discarded. This allows the statistics for a group of associated instances to be aggregated in a single query. Change-Id: I838db38bf2e01a0e5e4d76f3f401d7f41e1dff57
93 lines
2.9 KiB
Python
93 lines
2.9 KiB
Python
# -*- encoding: utf-8 -*-
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#
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# Copyright © 2012 New Dream Network, LLC (DreamHost)
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#
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# Author: Doug Hellmann <doug.hellmann@dreamhost.com>
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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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"""Common code for working with instances
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"""
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from oslo.config import cfg
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OPTS = [
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cfg.ListOpt('reserved_metadata_namespace',
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default=['metering.'],
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help='list of metadata prefixes resevred for metering use',
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),
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cfg.IntOpt('reserved_metadata_length',
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default=256,
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help='limit on length of reserved metadata values'),
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]
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cfg.CONF.register_opts(OPTS)
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INSTANCE_PROPERTIES = [
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# Identity properties
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'reservation_id',
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# Type properties
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'architecture',
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# Location properties
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'availability_zone',
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'kernel_id',
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'os_type',
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'ramdisk_id',
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# Capacity properties
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'disk_gb',
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'ephemeral_gb',
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'memory_mb',
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'root_gb',
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'vcpus']
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def add_reserved_user_metadata(instance, metadata):
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limit = cfg.CONF.reserved_metadata_length
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user_metadata = {}
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for prefix in cfg.CONF.reserved_metadata_namespace:
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md = dict(
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(k[len(prefix):].replace('.', '_'),
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v[:limit] if isinstance(v, basestring) else v)
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for k, v in instance.metadata.items()
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if (k.startswith(prefix) and
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k[len(prefix):].replace('.', '_') not in metadata)
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)
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user_metadata.update(md)
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if user_metadata:
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metadata['user_metadata'] = user_metadata
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return metadata
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def get_metadata_from_object(instance):
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"""Return a metadata dictionary for the instance.
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"""
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metadata = {
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'display_name': instance.name,
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'name': getattr(instance, 'OS-EXT-SRV-ATTR:instance_name', u''),
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'instance_type': (instance.flavor['id'] if instance.flavor else None),
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'host': instance.hostId,
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# Image properties
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'image_ref': (instance.image['id'] if instance.image else None),
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}
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# Images that come through the conductor API in the nova notifier
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# plugin will not have links.
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if instance.image and instance.image.get('links'):
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metadata['image_ref_url'] = instance.image['links'][0]['href']
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else:
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metadata['image_ref_url'] = None
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for name in INSTANCE_PROPERTIES:
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metadata[name] = getattr(instance, name, u'')
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return add_reserved_user_metadata(instance, metadata)
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