664 lines
26 KiB
Python
664 lines
26 KiB
Python
#
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# Copyright 2013 Julien Danjou
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# Copyright 2014-2017 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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import collections
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import glob
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import itertools
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import logging
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import os
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import random
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import uuid
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from concurrent import futures
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import cotyledon
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from futurist import periodics
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from keystoneauth1 import exceptions as ka_exceptions
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from oslo_config import cfg
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from oslo_log import log
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import oslo_messaging
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from oslo_utils import timeutils
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import six
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from six.moves.urllib import parse as urlparse
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from stevedore import extension
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from tooz import coordination
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from ceilometer import agent
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from ceilometer import declarative
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from ceilometer import keystone_client
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from ceilometer import messaging
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from ceilometer.polling import dynamic_pollster
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from ceilometer.polling import plugin_base
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from ceilometer.publisher import utils as publisher_utils
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from ceilometer import utils
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LOG = log.getLogger(__name__)
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POLLING_OPTS = [
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cfg.StrOpt('cfg_file',
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default="polling.yaml",
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help="Configuration file for polling definition."
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),
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cfg.StrOpt('partitioning_group_prefix',
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deprecated_group='central',
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help='Work-load partitioning group prefix. Use only if you '
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'want to run multiple polling agents with different '
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'config files. For each sub-group of the agent '
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'pool with the same partitioning_group_prefix a disjoint '
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'subset of pollsters should be loaded.'),
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cfg.IntOpt('batch_size',
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default=50,
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help='Batch size of samples to send to notification agent, '
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'Set to 0 to disable'),
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cfg.MultiStrOpt('pollsters_definitions_dirs',
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default=["/etc/ceilometer/pollsters.d"],
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help="List of directories with YAML files used "
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"to created pollsters.")
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]
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def hash_of_set(s):
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return str(hash(frozenset(s)))
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class PollingException(agent.ConfigException):
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def __init__(self, message, cfg):
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super(PollingException, self).__init__('Polling', message, cfg)
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class Resources(object):
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def __init__(self, agent_manager):
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self.agent_manager = agent_manager
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self._resources = []
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self._discovery = []
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self.blacklist = []
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def setup(self, source):
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self._resources = source.resources
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self._discovery = source.discovery
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def get(self, discovery_cache=None):
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source_discovery = (self.agent_manager.discover(self._discovery,
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discovery_cache)
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if self._discovery else [])
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if self._resources:
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static_resources_group = self.agent_manager.construct_group_id(
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hash_of_set(self._resources))
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return [v for v in self._resources if
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not self.agent_manager.partition_coordinator or
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self.agent_manager.hashrings[
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static_resources_group].belongs_to_self(
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six.text_type(v))] + source_discovery
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return source_discovery
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@staticmethod
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def key(source_name, pollster):
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return '%s-%s' % (source_name, pollster.name)
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def iter_random(iterable):
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"""Iter over iterable in a random fashion."""
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lst = list(iterable)
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random.shuffle(lst)
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return iter(lst)
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class PollingTask(object):
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"""Polling task for polling samples and notifying.
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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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# elements of the Cartesian product of sources X pollsters
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# with a common interval
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self.pollster_matches = collections.defaultdict(set)
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# we relate the static resources and per-source discovery to
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# each combination of pollster and matching source
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resource_factory = lambda: Resources(agent_manager)
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self.resources = collections.defaultdict(resource_factory)
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self._batch_size = self.manager.conf.polling.batch_size
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self._telemetry_secret = self.manager.conf.publisher.telemetry_secret
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def add(self, pollster, source):
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self.pollster_matches[source.name].add(pollster)
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key = Resources.key(source.name, pollster)
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self.resources[key].setup(source)
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def poll_and_notify(self):
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"""Polling sample and notify."""
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cache = {}
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discovery_cache = {}
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poll_history = {}
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for source_name, pollsters in iter_random(
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self.pollster_matches.items()):
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for pollster in iter_random(pollsters):
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key = Resources.key(source_name, pollster)
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candidate_res = list(
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self.resources[key].get(discovery_cache))
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if not candidate_res and pollster.obj.default_discovery:
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candidate_res = self.manager.discover(
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[pollster.obj.default_discovery], discovery_cache)
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# Remove duplicated resources and black resources. Using
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# set() requires well defined __hash__ for each resource.
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# Since __eq__ is defined, 'not in' is safe here.
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polling_resources = []
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black_res = self.resources[key].blacklist
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history = poll_history.get(pollster.name, [])
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for x in candidate_res:
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if x not in history:
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history.append(x)
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if x not in black_res:
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polling_resources.append(x)
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poll_history[pollster.name] = history
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# If no resources, skip for this pollster
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if not polling_resources:
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p_context = 'new ' if history else ''
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LOG.debug("Skip pollster %(name)s, no %(p_context)s "
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"resources found this cycle",
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{'name': pollster.name, 'p_context': p_context})
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continue
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LOG.info("Polling pollster %(poll)s in the context of "
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"%(src)s",
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dict(poll=pollster.name, src=source_name))
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try:
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polling_timestamp = timeutils.utcnow().isoformat()
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samples = pollster.obj.get_samples(
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manager=self.manager,
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cache=cache,
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resources=polling_resources
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)
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sample_batch = []
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for sample in samples:
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# Note(yuywz): Unify the timestamp of polled samples
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sample.set_timestamp(polling_timestamp)
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sample_dict = (
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publisher_utils.meter_message_from_counter(
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sample, self._telemetry_secret
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))
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if self._batch_size:
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if len(sample_batch) >= self._batch_size:
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self._send_notification(sample_batch)
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sample_batch = []
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sample_batch.append(sample_dict)
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else:
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self._send_notification([sample_dict])
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if sample_batch:
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self._send_notification(sample_batch)
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except plugin_base.PollsterPermanentError as err:
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LOG.error(
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'Prevent pollster %(name)s from '
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'polling %(res_list)s on source %(source)s anymore!',
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dict(name=pollster.name,
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res_list=str(err.fail_res_list),
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source=source_name))
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self.resources[key].blacklist.extend(err.fail_res_list)
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except Exception as err:
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LOG.error(
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'Continue after error from %(name)s: %(error)s'
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% ({'name': pollster.name, 'error': err}),
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exc_info=True)
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def _send_notification(self, samples):
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self.manager.notifier.sample(
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{},
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'telemetry.polling',
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{'samples': samples}
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)
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class AgentManager(cotyledon.Service):
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def __init__(self, worker_id, conf, namespaces=None):
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namespaces = namespaces or ['compute', 'central']
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group_prefix = conf.polling.partitioning_group_prefix
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super(AgentManager, self).__init__(worker_id)
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self.conf = conf
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if type(namespaces) is not list:
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namespaces = [namespaces]
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# we'll have default ['compute', 'central'] here if no namespaces will
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# be passed
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extensions = (self._extensions('poll', namespace, self.conf).extensions
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for namespace in namespaces)
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# get the extensions from pollster builder
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extensions_fb = (self._extensions_from_builder('poll', namespace)
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for namespace in namespaces)
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# Create dynamic pollsters
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extensions_dynamic_pollsters = self.create_dynamic_pollsters()
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self.extensions = list(itertools.chain(*list(extensions))) + list(
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itertools.chain(*list(extensions_fb))) + list(
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extensions_dynamic_pollsters)
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if not self.extensions:
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LOG.warning('No valid pollsters can be loaded from %s '
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'namespaces', namespaces)
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discoveries = (self._extensions('discover', namespace,
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self.conf).extensions
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for namespace in namespaces)
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self.discoveries = list(itertools.chain(*list(discoveries)))
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self.polling_periodics = None
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self.hashrings = None
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self.partition_coordinator = None
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if self.conf.coordination.backend_url:
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# XXX uuid4().bytes ought to work, but it requires ascii for now
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coordination_id = str(uuid.uuid4()).encode('ascii')
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self.partition_coordinator = coordination.get_coordinator(
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self.conf.coordination.backend_url, coordination_id)
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# Compose coordination group prefix.
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# We'll use namespaces as the basement for this partitioning.
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namespace_prefix = '-'.join(sorted(namespaces))
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self.group_prefix = ('%s-%s' % (namespace_prefix, group_prefix)
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if group_prefix else namespace_prefix)
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self.notifier = oslo_messaging.Notifier(
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messaging.get_transport(self.conf),
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driver=self.conf.publisher_notifier.telemetry_driver,
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publisher_id="ceilometer.polling")
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self._keystone = None
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self._keystone_last_exception = None
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def create_dynamic_pollsters(self):
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"""Creates dynamic pollsters
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This method Creates dynamic pollsters based on configurations placed on
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'pollsters_definitions_dirs'
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:return: a list with the dynamic pollsters defined by the operator.
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"""
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pollsters_definitions_dirs = self.conf.pollsters_definitions_dirs
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if not pollsters_definitions_dirs:
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LOG.info("Variable 'pollsters_definitions_dirs' not defined.")
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return []
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LOG.info("Looking for dynamic pollsters configurations at [%s].",
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pollsters_definitions_dirs)
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pollsters_definitions_files = []
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for directory in pollsters_definitions_dirs:
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files = glob.glob(os.path.join(directory, "*.yaml"))
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if not files:
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LOG.info("No dynamic pollsters found in folder [%s].",
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directory)
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continue
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for filepath in sorted(files):
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if filepath is not None:
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pollsters_definitions_files.append(filepath)
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if not pollsters_definitions_files:
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LOG.info("No dynamic pollsters file found in dirs [%s].",
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pollsters_definitions_dirs)
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return []
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pollsters_definitions = {}
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for pollsters_definitions_file in pollsters_definitions_files:
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pollsters_cfg = declarative.load_definitions(
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self.conf, {}, pollsters_definitions_file)
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LOG.info("File [%s] has [%s] dynamic pollster configurations.",
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pollsters_definitions_file, len(pollsters_cfg))
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for pollster_cfg in pollsters_cfg:
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pollster_name = pollster_cfg['name']
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if pollster_name not in pollsters_definitions:
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LOG.info("Loading dynamic pollster [%s] from file [%s].",
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pollster_name, pollsters_definitions_file)
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try:
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dynamic_pollster_object = dynamic_pollster.\
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DynamicPollster(pollster_cfg, self.conf)
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pollsters_definitions[pollster_name] = \
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dynamic_pollster_object
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except Exception as e:
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LOG.error(
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"Error [%s] while loading dynamic pollster [%s].",
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e, pollster_name)
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else:
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LOG.info(
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"Dynamic pollster [%s] is already defined."
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"Therefore, we are skipping it.", pollster_name)
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LOG.debug("Total of dynamic pollsters [%s] loaded.",
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len(pollsters_definitions))
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return pollsters_definitions.values()
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@staticmethod
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def _get_ext_mgr(namespace, *args, **kwargs):
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def _catch_extension_load_error(mgr, ep, exc):
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# Extension raising ExtensionLoadError can be ignored,
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# and ignore anything we can't import as a safety measure.
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if isinstance(exc, plugin_base.ExtensionLoadError):
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LOG.debug("Skip loading extension for %s: %s",
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ep.name, exc.msg)
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return
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show_exception = (LOG.isEnabledFor(logging.DEBUG)
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and isinstance(exc, ImportError))
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LOG.error("Failed to import extension for %(name)r: "
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"%(error)s",
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{'name': ep.name, 'error': exc},
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exc_info=show_exception)
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if isinstance(exc, ImportError):
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return
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raise exc
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return extension.ExtensionManager(
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namespace=namespace,
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invoke_on_load=True,
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invoke_args=args,
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invoke_kwds=kwargs,
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on_load_failure_callback=_catch_extension_load_error,
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)
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def _extensions(self, category, agent_ns=None, *args, **kwargs):
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namespace = ('ceilometer.%s.%s' % (category, agent_ns) if agent_ns
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else 'ceilometer.%s' % category)
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return self._get_ext_mgr(namespace, *args, **kwargs)
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def _extensions_from_builder(self, category, agent_ns=None):
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ns = ('ceilometer.builder.%s.%s' % (category, agent_ns) if agent_ns
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else 'ceilometer.builder.%s' % category)
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mgr = self._get_ext_mgr(ns, self.conf)
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def _build(ext):
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return ext.plugin.get_pollsters_extensions(self.conf)
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# NOTE: this seems a stevedore bug. if no extensions are found,
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# map will raise runtimeError which is not documented.
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if mgr.names():
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return list(itertools.chain(*mgr.map(_build)))
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else:
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return []
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def join_partitioning_groups(self):
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groups = set([self.construct_group_id(d.obj.group_id)
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for d in self.discoveries])
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# let each set of statically-defined resources have its own group
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static_resource_groups = set([
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self.construct_group_id(hash_of_set(p.resources))
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for p in self.polling_manager.sources
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if p.resources
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])
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groups.update(static_resource_groups)
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self.hashrings = dict(
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(group, self.partition_coordinator.join_partitioned_group(group))
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for group in groups)
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def setup_polling_tasks(self):
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polling_tasks = {}
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for source in self.polling_manager.sources:
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for pollster in self.extensions:
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if source.support_meter(pollster.name):
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polling_task = polling_tasks.get(source.get_interval())
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if not polling_task:
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polling_task = PollingTask(self)
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polling_tasks[source.get_interval()] = polling_task
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polling_task.add(pollster, source)
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return polling_tasks
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def construct_group_id(self, discovery_group_id):
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return '%s-%s' % (self.group_prefix, discovery_group_id)
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def start_polling_tasks(self):
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data = self.setup_polling_tasks()
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# Don't start useless threads if no task will run
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if not data:
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return
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# One thread per polling tasks is enough
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self.polling_periodics = periodics.PeriodicWorker.create(
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[], executor_factory=lambda:
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futures.ThreadPoolExecutor(max_workers=len(data)))
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|
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for interval, polling_task in data.items():
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@periodics.periodic(spacing=interval, run_immediately=True)
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def task(running_task):
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self.interval_task(running_task)
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self.polling_periodics.add(task, polling_task)
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utils.spawn_thread(self.polling_periodics.start, allow_empty=True)
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def run(self):
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super(AgentManager, self).run()
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self.polling_manager = PollingManager(self.conf)
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if self.partition_coordinator:
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self.partition_coordinator.start(start_heart=True)
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self.join_partitioning_groups()
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self.start_polling_tasks()
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def terminate(self):
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self.stop_pollsters_tasks()
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if self.partition_coordinator:
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self.partition_coordinator.stop()
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super(AgentManager, self).terminate()
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def interval_task(self, task):
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# NOTE(sileht): remove the previous keystone client
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# and exception to get a new one in this polling cycle.
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self._keystone = None
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self._keystone_last_exception = None
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# Note(leehom): if coordinator enabled call run_watchers to
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# update group member info before collecting
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if self.partition_coordinator:
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self.partition_coordinator.run_watchers()
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task.poll_and_notify()
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@property
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def keystone(self):
|
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# FIXME(sileht): This lazy loading of keystone client doesn't
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# look concurrently safe, we never see issue because once we have
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# connected to keystone everything is fine, and because all pollsters
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# are delayed during startup. But each polling task creates a new
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# client and overrides it which has been created by other polling
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# tasks. During this short time bad thing can occur.
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#
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# I think we must not reset keystone client before
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# running a polling task, but refresh it periodically instead.
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|
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# NOTE(sileht): we do lazy loading of the keystone client
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# for multiple reasons:
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# * don't use it if no plugin need it
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# * use only one client for all plugins per polling cycle
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if self._keystone is None and self._keystone_last_exception is None:
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try:
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self._keystone = keystone_client.get_client(self.conf)
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self._keystone_last_exception = None
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except ka_exceptions.ClientException as e:
|
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self._keystone = None
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self._keystone_last_exception = e
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if self._keystone is not None:
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return self._keystone
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else:
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raise self._keystone_last_exception
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|
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@staticmethod
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|
def _parse_discoverer(url):
|
|
s = urlparse.urlparse(url)
|
|
return (s.scheme or s.path), (s.netloc + s.path if s.scheme else None)
|
|
|
|
def _discoverer(self, name):
|
|
for d in self.discoveries:
|
|
if d.name == name:
|
|
return d.obj
|
|
return None
|
|
|
|
def discover(self, discovery=None, discovery_cache=None):
|
|
resources = []
|
|
discovery = discovery or []
|
|
for url in discovery:
|
|
if discovery_cache is not None and url in discovery_cache:
|
|
resources.extend(discovery_cache[url])
|
|
continue
|
|
name, param = self._parse_discoverer(url)
|
|
discoverer = self._discoverer(name)
|
|
if discoverer:
|
|
try:
|
|
if discoverer.KEYSTONE_REQUIRED_FOR_SERVICE:
|
|
service_type = getattr(
|
|
self.conf.service_types,
|
|
discoverer.KEYSTONE_REQUIRED_FOR_SERVICE)
|
|
if not keystone_client.\
|
|
get_service_catalog(self.keystone).\
|
|
get_endpoints(service_type=service_type):
|
|
LOG.warning(
|
|
'Skipping %(name)s, %(service_type)s service '
|
|
'is not registered in keystone',
|
|
{'name': name, 'service_type': service_type})
|
|
continue
|
|
|
|
discovered = discoverer.discover(self, param)
|
|
|
|
if self.partition_coordinator:
|
|
discovered = [
|
|
v for v in discovered if self.hashrings[
|
|
self.construct_group_id(discoverer.group_id)
|
|
].belongs_to_self(six.text_type(v))]
|
|
|
|
resources.extend(discovered)
|
|
if discovery_cache is not None:
|
|
discovery_cache[url] = discovered
|
|
except ka_exceptions.ClientException as e:
|
|
LOG.error('Skipping %(name)s, keystone issue: '
|
|
'%(exc)s', {'name': name, 'exc': e})
|
|
except Exception as err:
|
|
LOG.exception('Unable to discover resources: %s', err)
|
|
else:
|
|
LOG.warning('Unknown discovery extension: %s', name)
|
|
return resources
|
|
|
|
def stop_pollsters_tasks(self):
|
|
if self.polling_periodics:
|
|
self.polling_periodics.stop()
|
|
self.polling_periodics.wait()
|
|
self.polling_periodics = None
|
|
|
|
|
|
class PollingManager(agent.ConfigManagerBase):
|
|
"""Polling Manager to handle polling definition"""
|
|
|
|
def __init__(self, conf):
|
|
"""Setup the polling according to config.
|
|
|
|
The configuration is supported as follows:
|
|
|
|
{"sources": [{"name": source_1,
|
|
"interval": interval_time,
|
|
"meters" : ["meter_1", "meter_2"],
|
|
"resources": ["resource_uri1", "resource_uri2"],
|
|
},
|
|
{"name": source_2,
|
|
"interval": interval_time,
|
|
"meters" : ["meter_3"],
|
|
},
|
|
]}
|
|
}
|
|
|
|
The interval determines the cadence of sample polling
|
|
|
|
Valid meter format is '*', '!meter_name', or 'meter_name'.
|
|
'*' is wildcard symbol means any meters; '!meter_name' means
|
|
"meter_name" will be excluded; 'meter_name' means 'meter_name'
|
|
will be included.
|
|
|
|
Valid meters definition is all "included meter names", all
|
|
"excluded meter names", wildcard and "excluded meter names", or
|
|
only wildcard.
|
|
|
|
The resources is list of URI indicating the resources from where
|
|
the meters should be polled. It's optional and it's up to the
|
|
specific pollster to decide how to use it.
|
|
|
|
"""
|
|
super(PollingManager, self).__init__(conf)
|
|
cfg = self.load_config(conf.polling.cfg_file)
|
|
self.sources = []
|
|
if 'sources' not in cfg:
|
|
raise PollingException("sources required", cfg)
|
|
for s in cfg.get('sources'):
|
|
self.sources.append(PollingSource(s))
|
|
|
|
|
|
class PollingSource(agent.Source):
|
|
"""Represents a source of pollsters
|
|
|
|
In effect it is a set of pollsters emitting
|
|
samples for a set of matching meters. Each source encapsulates meter name
|
|
matching, polling interval determination, optional resource enumeration or
|
|
discovery.
|
|
"""
|
|
|
|
def __init__(self, cfg):
|
|
try:
|
|
super(PollingSource, self).__init__(cfg)
|
|
except agent.SourceException as err:
|
|
raise PollingException(err.msg, cfg)
|
|
try:
|
|
self.meters = cfg['meters']
|
|
except KeyError:
|
|
raise PollingException("Missing meters value", cfg)
|
|
try:
|
|
self.interval = int(cfg['interval'])
|
|
except ValueError:
|
|
raise PollingException("Invalid interval value", cfg)
|
|
except KeyError:
|
|
raise PollingException("Missing interval value", cfg)
|
|
if self.interval <= 0:
|
|
raise PollingException("Interval value should > 0", cfg)
|
|
|
|
self.resources = cfg.get('resources') or []
|
|
if not isinstance(self.resources, list):
|
|
raise PollingException("Resources should be a list", cfg)
|
|
|
|
self.discovery = cfg.get('discovery') or []
|
|
if not isinstance(self.discovery, list):
|
|
raise PollingException("Discovery should be a list", cfg)
|
|
try:
|
|
self.check_source_filtering(self.meters, 'meters')
|
|
except agent.SourceException as err:
|
|
raise PollingException(err.msg, cfg)
|
|
|
|
def get_interval(self):
|
|
return self.interval
|
|
|
|
def support_meter(self, meter_name):
|
|
return self.is_supported(self.meters, meter_name)
|