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common agent for all Change-Id: I19a83d3d0e5c91ab5cb6e792ab7389e36f8ede55
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# | ||
# 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 | ||
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from oslo_log import log | ||
from oslo_utils import fnmatch | ||
import six | ||
import yaml | ||
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LOG = log.getLogger(__name__) | ||
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class ConfigException(Exception): | ||
def __init__(self, cfg_type, message, cfg): | ||
self.cfg_type = cfg_type | ||
self.msg = message | ||
self.cfg = cfg | ||
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def __str__(self): | ||
return '%s %s: %s' % (self.cfg_type, self.cfg, self.msg) | ||
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class SourceException(Exception): | ||
def __init__(self, message, cfg): | ||
self.msg = message | ||
self.cfg = cfg | ||
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def __str__(self): | ||
return 'Source definition invalid: %s (%s)' % (self.msg, self.cfg) | ||
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class ConfigManagerBase(object): | ||
"""Base class for managing configuration file refresh""" | ||
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def __init__(self, conf): | ||
self.conf = conf | ||
self.cfg_loc = None | ||
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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.info("Config file: %s", conf) | ||
return conf | ||
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def get_cfg_mtime(self): | ||
"""Return modification time of cfg file""" | ||
return os.path.getmtime(self.cfg_loc) if self.cfg_loc else None | ||
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def get_cfg_hash(self): | ||
"""Return hash of configuration file""" | ||
if not self.cfg_loc: | ||
return None | ||
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with open(self.cfg_loc) as fap: | ||
data = fap.read() | ||
if six.PY3: | ||
data = data.encode('utf-8') | ||
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file_hash = hashlib.md5(data).hexdigest() | ||
return file_hash | ||
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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 | ||
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class Source(object): | ||
"""Represents a generic source""" | ||
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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) | ||
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def __str__(self): | ||
return self.name | ||
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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) | ||
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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) | ||
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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) | ||
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@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 | ||
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if any(fnmatch.fnmatch(data_name, datapoint) | ||
for datapoint in dataset if datapoint[0] != '!'): | ||
return True | ||
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# if we only have negation, we suppose the default is allow | ||
return all(datapoint.startswith('!') for datapoint in dataset) |
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