ceilometer.agent

Source code for ceilometer.agent

#
# Copyright 2013 Intel Corp.
# Copyright 2014 Red Hat, Inc
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import hashlib
import os
import pkg_resources

from oslo_log import log
from oslo_utils import fnmatch
import six
import yaml

LOG = log.getLogger(__name__)


[docs]class ConfigException(Exception): def __init__(self, cfg_type, message, cfg): self.cfg_type = cfg_type self.msg = message self.cfg = cfg def __str__(self): return '%s %s: %s' % (self.cfg_type, self.cfg, self.msg)
[docs]class SourceException(Exception): def __init__(self, message, cfg): self.msg = message self.cfg = cfg def __str__(self): return 'Source definition invalid: %s (%s)' % (self.msg, self.cfg)
[docs]class ConfigManagerBase(object): """Base class for managing configuration file refresh""" def __init__(self, conf): self.conf = conf self.cfg_loc = None
[docs] def load_config(self, cfg_file, fallback_cfg_prefix='pipeline/data/'): """Load a configuration file and set its refresh values.""" if os.path.exists(cfg_file): self.cfg_loc = cfg_file else: self.cfg_loc = self.conf.find_file(cfg_file) if not self.cfg_loc and fallback_cfg_prefix is not None: LOG.debug("No pipeline definitions configuration file found! " "Using default config.") self.cfg_loc = pkg_resources.resource_filename( __name__, fallback_cfg_prefix + cfg_file) with open(self.cfg_loc) as fap: data = fap.read() conf = yaml.safe_load(data) self.cfg_mtime = self.get_cfg_mtime() self.cfg_hash = self.get_cfg_hash() LOG.debug("Config file: %s", conf) return conf
[docs] def get_cfg_mtime(self): """Return modification time of cfg file""" return os.path.getmtime(self.cfg_loc) if self.cfg_loc else None
[docs] def get_cfg_hash(self): """Return hash of configuration file""" if not self.cfg_loc: return None with open(self.cfg_loc) as fap: data = fap.read() if six.PY3: data = data.encode('utf-8') file_hash = hashlib.md5(data).hexdigest() return file_hash
[docs] def cfg_changed(self): """Returns hash of changed cfg else False.""" mtime = self.get_cfg_mtime() if mtime > self.cfg_mtime: LOG.info('Configuration file has been updated.') self.cfg_mtime = mtime _hash = self.get_cfg_hash() if _hash != self.cfg_hash: LOG.info("Detected change in configuration.") return _hash return False
[docs]class Source(object): """Represents a generic source""" def __init__(self, cfg): self.cfg = cfg try: self.name = cfg['name'] except KeyError as err: raise SourceException( "Required field %s not specified" % err.args[0], cfg) def __str__(self): return self.name
[docs] def check_source_filtering(self, data, d_type): """Source data rules checking - At least one meaningful datapoint exist - Included type and excluded type can't co-exist on the same pipeline - Included type meter and wildcard can't co-exist at same pipeline """ if not data: raise SourceException('No %s specified' % d_type, self.cfg) if ([x for x in data if x[0] not in '!*'] and [x for x in data if x[0] == '!']): raise SourceException( 'Both included and excluded %s specified' % d_type, self.cfg) if '*' in data and [x for x in data if x[0] not in '!*']: raise SourceException( 'Included %s specified with wildcard' % d_type, self.cfg)
[docs] @staticmethod def is_supported(dataset, data_name): # Support wildcard like storage.* and !disk.* # Start with negation, we consider that the order is deny, allow if any(fnmatch.fnmatch(data_name, datapoint[1:]) for datapoint in dataset if datapoint[0] == '!'): return False if any(fnmatch.fnmatch(data_name, datapoint) for datapoint in dataset if datapoint[0] != '!'): return True # if we only have negation, we suppose the default is allow return all(datapoint.startswith('!') for datapoint in dataset)
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