7050d3be10
This is the work to complete the resource-metadata-caching blueprint. * Implement an in-memory cache in the compute agent. * Change compute-agent to populate an in-memory cache. * Change compute-agent to use the changes-since parameter in the Nova API call . * Change compute-agent to record the polling timestamp in the cache. * Change compute-agent to cache the flavor and image metadata as well. Implements blueprint resource-metadata-caching Change-Id: I97594e082db6d8e34d9201a7ec5710978e557d6d Signed-off-by: Jason Myers <jason@jasonamyers.com>
57 lines
1.9 KiB
Python
57 lines
1.9 KiB
Python
#
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# Copyright 2014 Red Hat, Inc
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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 oslo_config import cfg
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from oslo_utils import timeutils
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from ceilometer.agent import plugin_base
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from ceilometer import nova_client
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OPTS = [
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cfg.BoolOpt('workload_partitioning',
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default=False,
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help='Enable work-load partitioning, allowing multiple '
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'compute agents to be run simultaneously.')
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]
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cfg.CONF.register_opts(OPTS, group='compute')
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class InstanceDiscovery(plugin_base.DiscoveryBase):
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def __init__(self):
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super(InstanceDiscovery, self).__init__()
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self.nova_cli = nova_client.Client()
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self.last_run = None
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self.instances = {}
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def discover(self, manager, param=None):
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"""Discover resources to monitor."""
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instances = self.nova_cli.instance_get_all_by_host(
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cfg.CONF.host, self.last_run)
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for instance in instances:
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if getattr(instance, 'OS-EXT-STS:vm_state', None) in ['deleted',
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'error']:
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self.instances.pop(instance.id, None)
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else:
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self.instances[instance.id] = instance
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self.last_run = timeutils.utcnow(True).isoformat()
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return self.instances.values()
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@property
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def group_id(self):
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if cfg.CONF.compute.workload_partitioning:
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return cfg.CONF.host
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else:
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return None
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