168 lines
5.3 KiB
Python
168 lines
5.3 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 Objectif Libre
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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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#
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# @author: Stéphane Albert
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#
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import abc
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from oslo_config import cfg
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import six
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from stevedore import driver
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from cloudkitty import transformer
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from cloudkitty import utils as ck_utils
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CONF = cfg.CONF
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COLLECTORS_NAMESPACE = 'cloudkitty.collector.backends'
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def get_collector(transformers=None):
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metrics_conf = ck_utils.get_metrics_conf(CONF.collect.metrics_conf)
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if not transformers:
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transformers = transformer.get_transformers()
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collector_args = {
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'period': metrics_conf.get('period', 3600),
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'transformers': transformers,
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}
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collector_args.update({'conf': metrics_conf})
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return driver.DriverManager(
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COLLECTORS_NAMESPACE,
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metrics_conf.get('collector', 'gnocchi'),
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invoke_on_load=True,
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invoke_kwds=collector_args).driver
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def get_collector_without_invoke():
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"""Return the collector without invoke it."""
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metrics_conf = ck_utils.get_metrics_conf(CONF.collect.metrics_conf)
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return driver.DriverManager(
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COLLECTORS_NAMESPACE,
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metrics_conf.get('collector', 'gnocchi'),
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invoke_on_load=False
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).driver
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def get_metrics_based_collector_metadata():
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"""Return dict of metadata.
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Results are based on enabled collector and metrics in CONF.
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"""
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metrics_conf = ck_utils.get_metrics_conf(CONF.collect.metrics_conf)
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transformers = transformer.get_transformers()
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collector = get_collector_without_invoke()
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metadata = {}
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if 'metrics' in metrics_conf:
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for metric in metrics_conf.get('metrics', {}):
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metadata[metric] = collector.get_metadata(
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metric,
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transformers,
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metrics_conf,
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)
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return metadata
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class TransformerDependencyError(Exception):
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"""Raised when a collector can't find a mandatory transformer."""
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def __init__(self, collector, transformer):
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super(TransformerDependencyError, self).__init__(
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"Transformer '%s' not found, but required by %s" % (transformer,
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collector))
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self.collector = collector
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self.transformer = transformer
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class NoDataCollected(Exception):
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"""Raised when the collection returned no data.
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"""
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def __init__(self, collector, resource):
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super(NoDataCollected, self).__init__(
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"Collector '%s' returned no data for resource '%s'" % (
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collector, resource))
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self.collector = collector
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self.resource = resource
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@six.add_metaclass(abc.ABCMeta)
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class BaseCollector(object):
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collector_name = None
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dependencies = []
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def __init__(self, transformers, **kwargs):
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try:
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self.transformers = transformers
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self.period = kwargs['period']
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self.conf = kwargs['conf']
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except IndexError as e:
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raise ValueError("Missing argument (%s)" % e)
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self._check_transformers()
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def _check_transformers(self):
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"""Check for transformer prerequisites
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"""
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for dependency in self.dependencies:
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if dependency not in self.transformers:
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raise TransformerDependencyError(self.collector_name,
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dependency)
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@staticmethod
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def last_month():
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month_start = ck_utils.get_month_start()
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month_end = ck_utils.get_month_end()
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start_ts = ck_utils.dt2ts(month_start)
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end_ts = ck_utils.dt2ts(month_end)
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return start_ts, end_ts
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@staticmethod
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def current_month():
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month_start = ck_utils.get_month_start()
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return ck_utils.dt2ts(month_start)
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@classmethod
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def _res_to_func(cls, resource_name):
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trans_resource = 'get_'
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trans_resource += resource_name.replace('.', '_')
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return trans_resource
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@classmethod
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def get_metadata(cls, resource_name, transformers):
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"""Return metadata about collected resource as a dict.
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Dict object should contain:
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- "metadata": available metadata list,
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- "unit": collected quantity unit
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"""
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return {"metadata": [], "unit": "undefined"}
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def retrieve(self,
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resource,
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start,
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end=None,
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project_id=None,
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q_filter=None):
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trans_resource = self._res_to_func(resource)
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if not hasattr(self, trans_resource):
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raise NotImplementedError(
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"No method found in collector '%s' for resource '%s'."
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% (self.collector_name, resource))
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func = getattr(self, trans_resource)
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return func(resource, start, end, project_id, q_filter)
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