dbccbb5cb9
We will eventually need the compute agent to accept instructions to poll the status of an instance before nova deletes it (for details see bug 1005944). This change prepares for that fix by making the compute agent pollsters take an instance as an argument provided by the caller, instead of accessing the database directly to look up the instances known to be running on the current host. Change-Id: I6a16405fd65bfb3c190d02f3d70b2bde7fc0fc83 Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
76 lines
2.7 KiB
Python
76 lines
2.7 KiB
Python
# -*- encoding: utf-8 -*-
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#
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# Copyright © 2012 eNovance <licensing@enovance.com>
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#
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# Author: Julien Danjou <julien@danjou.info>
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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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import pkg_resources
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from nova import manager
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from ceilometer.openstack.common import log
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from ceilometer import publish
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LOG = log.getLogger(__name__)
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PLUGIN_NAMESPACE = 'ceilometer.poll.compute'
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class AgentManager(manager.Manager):
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def init_host(self):
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self._load_plugins()
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return
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def _load_plugins(self):
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self.pollsters = []
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for ep in pkg_resources.iter_entry_points(PLUGIN_NAMESPACE):
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try:
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plugin_class = ep.load()
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plugin = plugin_class()
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# FIXME(dhellmann): Currently assumes all plugins are
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# enabled when they are discovered and
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# importable. Need to add check against global
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# configuration flag and check that asks the plugin if
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# it should be enabled.
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self.pollsters.append((ep.name, plugin))
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LOG.info('loaded pollster %s:%s',
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PLUGIN_NAMESPACE, ep.name)
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except Exception as err:
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LOG.warning('Failed to load pollster %s:%s',
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ep.name, err)
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LOG.exception(err)
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if not self.pollsters:
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LOG.warning('Failed to load any pollsters for %s',
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PLUGIN_NAMESPACE)
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return
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def periodic_tasks(self, context, raise_on_error=False):
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"""Tasks to be run at a periodic interval."""
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# FIXME(dhellmann): How do we get a list of instances without
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# talking directly to the database?
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for instance in self.db.instance_get_all_by_host(context, self.host):
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for name, pollster in self.pollsters:
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try:
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LOG.info('polling %s', name)
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for c in pollster.get_counters(self, instance):
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LOG.info('COUNTER: %s', c)
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publish.publish_counter(context, c)
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except Exception as err:
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LOG.warning('Continuing after error from %s: %s',
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name, err)
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LOG.exception(err)
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