5de8c6fce5
1. Change the pollster's interface to support resources: - Added optional parameter 'resources' to the method get_samples. It specifies a list of the endpoints from which the pollster would get data. 2. Change the PollingTask to record the resources for each pollster. 3. Pass the resources recorded in PollingTask to the pollsters in central agent. This patch only changes the interface of pollsters and PollingTask in central agent. The existing central agent's pollsters still ignore the resources passed in by the PollingTask. Implements: blueprint support-resources-pipeline-item Change-Id: Ic7a83c63ea291d0527004113bc8d8bb09311d14f
101 lines
3.3 KiB
Python
101 lines
3.3 KiB
Python
# -*- encoding: utf-8 -*-
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#
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# Copyright © 2013 Julien Danjou
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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 abc
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import collections
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import itertools
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from ceilometer.openstack.common import context
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from ceilometer.openstack.common import log
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from ceilometer.openstack.common import service as os_service
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from ceilometer import pipeline
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from ceilometer import transformer
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LOG = log.getLogger(__name__)
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class PollingTask(object):
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"""Polling task for polling samples and inject into pipeline.
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A polling task can be invoked periodically or only once.
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"""
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def __init__(self, agent_manager):
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self.manager = agent_manager
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self.pollsters = set()
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# Resource definitions are indexed by the pollster
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# Use dict of set here to remove the duplicated resource definitions
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# for each pollster.
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self.resources = collections.defaultdict(set)
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self.publish_context = pipeline.PublishContext(
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agent_manager.context)
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def add(self, pollster, pipelines):
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self.publish_context.add_pipelines(pipelines)
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for pipeline in pipelines:
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self.resources[pollster.name].update(pipeline.resources)
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self.pollsters.update([pollster])
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@abc.abstractmethod
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def poll_and_publish(self):
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"""Polling sample and publish into pipeline."""
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class AgentManager(os_service.Service):
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def __init__(self, extension_manager):
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super(AgentManager, self).__init__()
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self.pollster_manager = extension_manager
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self.context = context.RequestContext('admin', 'admin', is_admin=True)
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@abc.abstractmethod
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def create_polling_task(self):
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"""Create an empty polling task."""
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def setup_polling_tasks(self):
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polling_tasks = {}
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for pipeline, pollster in itertools.product(
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self.pipeline_manager.pipelines,
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self.pollster_manager.extensions):
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if pipeline.support_meter(pollster.name):
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polling_task = polling_tasks.get(pipeline.interval, None)
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if not polling_task:
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polling_task = self.create_polling_task()
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polling_tasks[pipeline.interval] = polling_task
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polling_task.add(pollster, [pipeline])
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return polling_tasks
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def start(self):
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self.pipeline_manager = pipeline.setup_pipeline(
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transformer.TransformerExtensionManager(
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'ceilometer.transformer',
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),
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)
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for interval, task in self.setup_polling_tasks().iteritems():
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self.tg.add_timer(interval,
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self.interval_task,
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task=task)
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@staticmethod
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def interval_task(task):
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task.poll_and_publish()
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