0e8f2359d9
This changeset is phase one of changing the pollster API to support polling individual instance resources. In this change, the single compute agent is divided into two separate daemons. The compute agent, for polling instance data, is still meant to run on the compute server. The new "central" agent, for polling resources not tied to a compute node, is meant to run on a management server (probably the same place the collector runs). The configuration of the pollsters is updated so that they are loaded by the appropriate agent. New base classes are introduced for each of the types of pollsters. For now, the APIs remain the same. The code implementing the agent and plugins has been moved around to reflect the new logical relationships, and the documentation is updated (including new installation instructions). Change-Id: Ica6e947b2e457f7db6672147af1369a24066037d Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
72 lines
2.5 KiB
Python
72 lines
2.5 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.central'
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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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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, context):
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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', name, err)
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LOG.exception(err)
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