16b9f9006a
This just split the polling code for one instance out of the periodic task function to be able to use this code for only one instance. Change-Id: I4ec0ab3870410f0b6c7e44857a9dede60fb6d50b Signed-off-by: Julien Danjou <julien@danjou.info>
80 lines
2.9 KiB
Python
80 lines
2.9 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 poll_instance(self, context, instance):
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"""Poll one instance."""
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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 for %s: %s',
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name, instance.name, err)
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LOG.exception(err)
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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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self.poll_instance(context, instance)
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