39ae236ece
Change-Id: I14de69e743aece44b496aa62e89a8066b1fdde67 Signed-off-by: Julien Danjou <julien@danjou.info>
137 lines
4.0 KiB
Python
137 lines
4.0 KiB
Python
# -*- encoding: utf-8 -*-
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#
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# Copyright © 2012 New Dream Network, LLC (DreamHost)
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#
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# Author: Doug Hellmann <doug.hellmann@dreamhost.com>
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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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"""Base class for plugins.
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"""
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import abc
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from collections import namedtuple
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# Import rpc_notifier to register notification_topics flag so that
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# plugins can use it
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import ceilometer.openstack.common.notifier.rpc_notifier
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ExchangeTopics = namedtuple('ExchangeTopics', ['exchange', 'topics'])
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class PluginBase(object):
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"""Base class for all plugins.
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"""
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def is_enabled(self):
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"""Return boolean indicating whether this plugin should
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be enabled and used by the caller.
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"""
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return True
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class NotificationBase(PluginBase):
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"""Base class for plugins that support the notification API."""
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__metaclass__ = abc.ABCMeta
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def is_enabled(self):
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return True
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@abc.abstractmethod
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def get_event_types(self):
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"""Return a sequence of strings defining the event types to be
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given to this plugin."""
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@abc.abstractmethod
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def get_exchange_topics(self, conf):
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"""Return a sequence of ExchangeTopics defining the exchange and
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topics to be connected for this plugin.
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:param conf: Configuration.
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"""
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@abc.abstractmethod
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def process_notification(self, message):
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"""Return a sequence of Counter instances for the given message.
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:param message: Message to process."""
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def notification_to_metadata(self, event):
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"""Transform a payload dict to a metadata dict."""
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metadata = dict([(k, event['payload'].get(k))
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for k in self.metadata_keys])
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metadata['event_type'] = event['event_type']
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metadata['host'] = event['publisher_id']
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return metadata
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class PollsterBase(PluginBase):
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"""Base class for plugins that support the polling API."""
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__metaclass__ = abc.ABCMeta
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@staticmethod
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@abc.abstractmethod
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def get_counter_names():
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"""Return a sequence of Counter names supported by the pollster."""
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@abc.abstractmethod
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def get_counters(self, manager, instance):
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"""Return a sequence of Counter instances from polling the
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resources."""
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class PublisherBase(PluginBase):
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"""Base class for plugins that publish the sampler."""
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__metaclass__ = abc.ABCMeta
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@abc.abstractmethod
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def publish_counters(self, context, counters, source):
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"Publish counters into final conduit."
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class TransformerBase(PluginBase):
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"""Base class for plugins that transform the counter."""
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__metaclass__ = abc.ABCMeta
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@abc.abstractmethod
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def handle_sample(self, context, counter, source):
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"""Transform a counter.
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:param context: Passed from the data collector.
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:param counter: A counter.
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:param source: Passed from data collector.
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"""
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def flush(self, context, source):
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"""Flush counters cached previously.
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:param context: Passed from the data collector.
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:param source: Source of counters that are being published."""
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return []
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def __init__(self, **kwargs):
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"""Setup transformer.
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Each time a transformed is involved in a pipeline, a new transformer
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instance is created and chained into the pipeline. i.e. transformer
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instance is per pipeline. This helps if transformer need keep some
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cache and per-pipeline information.
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:param kwargs: The parameters that are defined in pipeline config file.
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"""
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super(TransformerBase, self).__init__()
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