88 lines
3.4 KiB
Python
88 lines
3.4 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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cfg.IntOpt('resource_update_interval',
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default=0,
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min=0,
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help="New instances will be discovered periodically based"
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" on this option (in seconds). By default, "
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"the agent discovers instances according to pipeline "
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"polling interval. If option is greater than 0, "
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"the instance list to poll will be updated based "
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"on this option's interval. Measurements relating "
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"to the instances will match intervals "
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"defined in pipeline.")
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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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self.expiration_time = cfg.CONF.compute.resource_update_interval
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def discover(self, manager, param=None):
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"""Discover resources to monitor."""
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secs_from_last_update = 0
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if self.last_run:
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secs_from_last_update = timeutils.delta_seconds(
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self.last_run, timeutils.utcnow(True))
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instances = []
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# NOTE(ityaptin) we update make a nova request only if
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# it's a first discovery or resources expired
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if not self.last_run or secs_from_last_update >= self.expiration_time:
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try:
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utc_now = timeutils.utcnow(True)
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since = self.last_run.isoformat() if self.last_run else None
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instances = self.nova_cli.instance_get_all_by_host(
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cfg.CONF.host, since)
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self.last_run = utc_now
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except Exception:
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# NOTE(zqfan): instance_get_all_by_host is wrapped and will log
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# exception when there is any error. It is no need to raise it
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# again and print one more time.
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return []
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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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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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