119 lines
3.9 KiB
Python
119 lines
3.9 KiB
Python
#
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# Copyright 2013 Intel Corp.
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# Copyright 2014 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 os
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import pkg_resources
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from oslo_log import log
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from oslo_utils import fnmatch
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import yaml
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LOG = log.getLogger(__name__)
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class ConfigException(Exception):
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def __init__(self, cfg_type, message, cfg):
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self.cfg_type = cfg_type
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self.msg = message
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self.cfg = cfg
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def __str__(self):
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return '%s %s: %s' % (self.cfg_type, self.cfg, self.msg)
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class SourceException(Exception):
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def __init__(self, message, cfg):
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self.msg = message
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self.cfg = cfg
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def __str__(self):
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return 'Source definition invalid: %s (%s)' % (self.msg, self.cfg)
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class ConfigManagerBase(object):
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"""Base class for managing configuration file refresh"""
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def __init__(self, conf):
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self.conf = conf
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def load_config(self, cfg_file, fallback_cfg_prefix='pipeline/data/'):
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"""Load a configuration file and set its refresh values."""
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if os.path.exists(cfg_file):
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cfg_loc = cfg_file
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else:
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cfg_loc = self.conf.find_file(cfg_file)
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if not cfg_loc and fallback_cfg_prefix is not None:
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LOG.debug("No pipeline definitions configuration file found! "
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"Using default config.")
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cfg_loc = pkg_resources.resource_filename(
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__name__, fallback_cfg_prefix + cfg_file)
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else:
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raise RuntimeError("No configuration file can be found")
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with open(cfg_loc) as fap:
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conf = yaml.safe_load(fap)
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LOG.info("Config file: %s", conf)
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return conf
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class Source(object):
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"""Represents a generic source"""
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def __init__(self, cfg):
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self.cfg = cfg
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try:
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self.name = cfg['name']
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except KeyError as err:
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raise SourceException(
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"Required field %s not specified" % err.args[0], cfg)
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def __str__(self):
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return self.name
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def check_source_filtering(self, data, d_type):
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"""Source data rules checking
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- At least one meaningful datapoint exist
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- Included type and excluded type can't co-exist on the same pipeline
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- Included type meter and wildcard can't co-exist at same pipeline
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"""
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if not data:
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raise SourceException('No %s specified' % d_type, self.cfg)
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if ([x for x in data if x[0] not in '!*'] and
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[x for x in data if x[0] == '!']):
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raise SourceException(
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'Both included and excluded %s specified' % d_type,
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self.cfg)
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if '*' in data and [x for x in data if x[0] not in '!*']:
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raise SourceException(
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'Included %s specified with wildcard' % d_type,
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self.cfg)
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@staticmethod
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def is_supported(dataset, data_name):
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# Support wildcard like storage.* and !disk.*
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# Start with negation, we consider that the order is deny, allow
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if any(fnmatch.fnmatch(data_name, datapoint[1:])
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for datapoint in dataset if datapoint[0] == '!'):
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return False
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if any(fnmatch.fnmatch(data_name, datapoint)
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for datapoint in dataset if datapoint[0] != '!'):
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return True
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# if we only have negation, we suppose the default is allow
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return all(datapoint.startswith('!') for datapoint in dataset)
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