881 lines
30 KiB
Python
881 lines
30 KiB
Python
# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# Copyright 2011 Justin Santa Barbara
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# All Rights Reserved.
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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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"""Utilities and helper functions."""
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from collections import OrderedDict
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import contextlib
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import datetime
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import functools
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import inspect
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import math
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import multiprocessing
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import operator
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import os
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import pyclbr
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import re
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import shutil
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import stat
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import sys
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import tempfile
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import eventlet
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from eventlet import tpool
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from oslo_concurrency import lockutils
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from oslo_concurrency import processutils
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from oslo_config import cfg
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from oslo_log import log as logging
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from oslo_utils import excutils
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from oslo_utils import importutils
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from oslo_utils import strutils
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from oslo_utils import timeutils
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import tenacity
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from cinder import exception
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from cinder.i18n import _
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CONF = cfg.CONF
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LOG = logging.getLogger(__name__)
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ISO_TIME_FORMAT = "%Y-%m-%dT%H:%M:%S"
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PERFECT_TIME_FORMAT = "%Y-%m-%dT%H:%M:%S.%f"
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INITIAL_AUTO_MOSR = 20
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INFINITE_UNKNOWN_VALUES = ('infinite', 'unknown')
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synchronized = lockutils.synchronized_with_prefix('cinder-')
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def as_int(obj, quiet=True):
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# Try "2" -> 2
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try:
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return int(obj)
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except (ValueError, TypeError):
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pass
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# Try "2.5" -> 2
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try:
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return int(float(obj))
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except (ValueError, TypeError):
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pass
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# Eck, not sure what this is then.
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if not quiet:
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raise TypeError(_("Can not translate %s to integer.") % (obj))
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return obj
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def check_exclusive_options(**kwargs):
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"""Checks that only one of the provided options is actually not-none.
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Iterates over all the kwargs passed in and checks that only one of said
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arguments is not-none, if more than one is not-none then an exception will
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be raised with the names of those arguments who were not-none.
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"""
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if not kwargs:
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return
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pretty_keys = kwargs.pop("pretty_keys", True)
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exclusive_options = {}
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for (k, v) in kwargs.items():
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if v is not None:
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exclusive_options[k] = True
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if len(exclusive_options) > 1:
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# Change the format of the names from pythonic to
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# something that is more readable.
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#
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# Ex: 'the_key' -> 'the key'
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if pretty_keys:
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names = [k.replace('_', ' ') for k in kwargs]
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else:
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names = kwargs.keys()
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names = ", ".join(sorted(names))
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msg = (_("May specify only one of %s") % (names))
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raise exception.InvalidInput(reason=msg)
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def execute(*cmd, **kwargs):
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"""Convenience wrapper around oslo's execute() method."""
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if 'run_as_root' in kwargs and 'root_helper' not in kwargs:
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kwargs['root_helper'] = get_root_helper()
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return processutils.execute(*cmd, **kwargs)
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def check_ssh_injection(cmd_list):
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ssh_injection_pattern = ['`', '$', '|', '||', ';', '&', '&&', '>', '>>',
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'<']
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# Check whether injection attacks exist
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for arg in cmd_list:
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arg = arg.strip()
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# Check for matching quotes on the ends
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is_quoted = re.match('^(?P<quote>[\'"])(?P<quoted>.*)(?P=quote)$', arg)
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if is_quoted:
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# Check for unescaped quotes within the quoted argument
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quoted = is_quoted.group('quoted')
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if quoted:
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if (re.match('[\'"]', quoted) or
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re.search('[^\\\\][\'"]', quoted)):
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raise exception.SSHInjectionThreat(command=cmd_list)
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else:
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# We only allow spaces within quoted arguments, and that
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# is the only special character allowed within quotes
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if len(arg.split()) > 1:
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raise exception.SSHInjectionThreat(command=cmd_list)
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# Second, check whether danger character in command. So the shell
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# special operator must be a single argument.
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for c in ssh_injection_pattern:
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if c not in arg:
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continue
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result = arg.find(c)
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if not result == -1:
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if result == 0 or not arg[result - 1] == '\\':
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raise exception.SSHInjectionThreat(command=cmd_list)
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def check_metadata_properties(metadata=None):
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"""Checks that the volume metadata properties are valid."""
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if not metadata:
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metadata = {}
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if not isinstance(metadata, dict):
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msg = _("Metadata should be a dict.")
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raise exception.InvalidInput(msg)
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for k, v in metadata.items():
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try:
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check_string_length(k, "Metadata key: %s" % k, min_length=1)
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check_string_length(v, "Value for metadata key: %s" % k)
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except exception.InvalidInput as exc:
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raise exception.InvalidVolumeMetadata(reason=exc)
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# for backward compatibility
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if len(k) > 255:
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msg = _("Metadata property key %s greater than 255 "
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"characters.") % k
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raise exception.InvalidVolumeMetadataSize(reason=msg)
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if len(v) > 255:
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msg = _("Metadata property key %s value greater than "
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"255 characters.") % k
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raise exception.InvalidVolumeMetadataSize(reason=msg)
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def last_completed_audit_period(unit=None):
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"""This method gives you the most recently *completed* audit period.
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arguments:
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units: string, one of 'hour', 'day', 'month', 'year'
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Periods normally begin at the beginning (UTC) of the
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period unit (So a 'day' period begins at midnight UTC,
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a 'month' unit on the 1st, a 'year' on Jan, 1)
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unit string may be appended with an optional offset
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like so: 'day@18' This will begin the period at 18:00
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UTC. 'month@15' starts a monthly period on the 15th,
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and year@3 begins a yearly one on March 1st.
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returns: 2 tuple of datetimes (begin, end)
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The begin timestamp of this audit period is the same as the
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end of the previous.
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"""
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if not unit:
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unit = CONF.volume_usage_audit_period
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offset = 0
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if '@' in unit:
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unit, offset = unit.split("@", 1)
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offset = int(offset)
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rightnow = timeutils.utcnow()
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if unit not in ('month', 'day', 'year', 'hour'):
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raise ValueError('Time period must be hour, day, month or year')
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if unit == 'month':
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if offset == 0:
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offset = 1
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end = datetime.datetime(day=offset,
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month=rightnow.month,
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year=rightnow.year)
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if end >= rightnow:
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year = rightnow.year
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if 1 >= rightnow.month:
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year -= 1
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month = 12 + (rightnow.month - 1)
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else:
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month = rightnow.month - 1
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end = datetime.datetime(day=offset,
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month=month,
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year=year)
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year = end.year
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if 1 >= end.month:
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year -= 1
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month = 12 + (end.month - 1)
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else:
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month = end.month - 1
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begin = datetime.datetime(day=offset, month=month, year=year)
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elif unit == 'year':
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if offset == 0:
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offset = 1
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end = datetime.datetime(day=1, month=offset, year=rightnow.year)
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if end >= rightnow:
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end = datetime.datetime(day=1,
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month=offset,
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year=rightnow.year - 1)
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begin = datetime.datetime(day=1,
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month=offset,
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year=rightnow.year - 2)
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else:
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begin = datetime.datetime(day=1,
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month=offset,
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year=rightnow.year - 1)
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elif unit == 'day':
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end = datetime.datetime(hour=offset,
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day=rightnow.day,
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month=rightnow.month,
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year=rightnow.year)
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if end >= rightnow:
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end = end - datetime.timedelta(days=1)
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begin = end - datetime.timedelta(days=1)
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elif unit == 'hour':
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end = rightnow.replace(minute=offset, second=0, microsecond=0)
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if end >= rightnow:
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end = end - datetime.timedelta(hours=1)
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begin = end - datetime.timedelta(hours=1)
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return (begin, end)
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def monkey_patch():
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"""Patches decorators for all functions in a specified module.
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If the CONF.monkey_patch set as True,
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this function patches a decorator
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for all functions in specified modules.
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You can set decorators for each modules
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using CONF.monkey_patch_modules.
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The format is "Module path:Decorator function".
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Example: 'cinder.api.ec2.cloud:' \
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cinder.openstack.common.notifier.api.notify_decorator'
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Parameters of the decorator are as follows.
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(See cinder.openstack.common.notifier.api.notify_decorator)
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:param name: name of the function
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:param function: object of the function
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"""
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# If CONF.monkey_patch is not True, this function do nothing.
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if not CONF.monkey_patch:
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return
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# Get list of modules and decorators
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for module_and_decorator in CONF.monkey_patch_modules:
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module, decorator_name = module_and_decorator.split(':')
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# import decorator function
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decorator = importutils.import_class(decorator_name)
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__import__(module)
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# Retrieve module information using pyclbr
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module_data = pyclbr.readmodule_ex(module)
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for key in module_data.keys():
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# set the decorator for the class methods
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if isinstance(module_data[key], pyclbr.Class):
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clz = importutils.import_class("%s.%s" % (module, key))
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# On Python 3, unbound methods are regular functions
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predicate = inspect.isfunction
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for method, func in inspect.getmembers(clz, predicate):
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setattr(
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clz, method,
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decorator("%s.%s.%s" % (module, key, method), func))
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# set the decorator for the function
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elif isinstance(module_data[key], pyclbr.Function):
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func = importutils.import_class("%s.%s" % (module, key))
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setattr(sys.modules[module], key,
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decorator("%s.%s" % (module, key), func))
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def make_dev_path(dev, partition=None, base='/dev'):
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"""Return a path to a particular device.
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>>> make_dev_path('xvdc')
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/dev/xvdc
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>>> make_dev_path('xvdc', 1)
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/dev/xvdc1
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"""
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path = os.path.join(base, dev)
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if partition:
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path += str(partition)
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return path
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def robust_file_write(directory, filename, data):
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"""Robust file write.
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Use "write to temp file and rename" model for writing the
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persistence file.
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:param directory: Target directory to create a file.
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:param filename: File name to store specified data.
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:param data: String data.
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"""
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tempname = None
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dirfd = None
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try:
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dirfd = os.open(directory, os.O_DIRECTORY)
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# write data to temporary file
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with tempfile.NamedTemporaryFile(prefix=filename,
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dir=directory,
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delete=False) as tf:
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tempname = tf.name
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tf.write(data.encode('utf-8'))
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tf.flush()
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os.fdatasync(tf.fileno())
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tf.close()
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# Fsync the directory to ensure the fact of the existence of
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# the temp file hits the disk.
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os.fsync(dirfd)
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# If destination file exists, it will be replaced silently.
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os.rename(tempname, os.path.join(directory, filename))
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# Fsync the directory to ensure the rename hits the disk.
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os.fsync(dirfd)
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except OSError:
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with excutils.save_and_reraise_exception():
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LOG.error("Failed to write persistence file: %(path)s.",
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{'path': os.path.join(directory, filename)})
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if os.path.isfile(tempname):
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os.unlink(tempname)
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finally:
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if dirfd:
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os.close(dirfd)
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@contextlib.contextmanager
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def temporary_chown(path, owner_uid=None):
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"""Temporarily chown a path.
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:params owner_uid: UID of temporary owner (defaults to current user)
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"""
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if os.name == 'nt':
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LOG.debug("Skipping chown for %s as this operation is "
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"not available on Windows.", path)
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yield
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return
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if owner_uid is None:
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owner_uid = os.getuid()
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orig_uid = os.stat(path).st_uid
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if orig_uid != owner_uid:
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execute('chown', owner_uid, path, run_as_root=True)
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try:
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yield
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finally:
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if orig_uid != owner_uid:
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execute('chown', orig_uid, path, run_as_root=True)
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@contextlib.contextmanager
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def tempdir(**kwargs):
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tmpdir = tempfile.mkdtemp(**kwargs)
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try:
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yield tmpdir
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finally:
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try:
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shutil.rmtree(tmpdir)
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except OSError as e:
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LOG.debug('Could not remove tmpdir: %s', str(e))
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def get_root_helper():
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return 'sudo cinder-rootwrap %s' % CONF.rootwrap_config
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def require_driver_initialized(driver):
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"""Verifies if `driver` is initialized
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If the driver is not initialized, an exception will be raised.
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:params driver: The driver instance.
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:raises: `exception.DriverNotInitialized`
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"""
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# we can't do anything if the driver didn't init
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if not driver.initialized:
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driver_name = driver.__class__.__name__
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LOG.error("Volume driver %s not initialized", driver_name)
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raise exception.DriverNotInitialized()
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else:
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log_unsupported_driver_warning(driver)
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def log_unsupported_driver_warning(driver):
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"""Annoy the log about unsupported drivers."""
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if not driver.supported:
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# Check to see if the driver is flagged as supported.
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LOG.warning("Volume driver (%(driver_name)s %(version)s) is "
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"currently unsupported and may be removed in the "
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"next release of OpenStack. Use at your own risk.",
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{'driver_name': driver.__class__.__name__,
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'version': driver.get_version()},
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resource={'type': 'driver',
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'id': driver.__class__.__name__})
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def get_file_mode(path):
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"""This primarily exists to make unit testing easier."""
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return stat.S_IMODE(os.stat(path).st_mode)
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def get_file_gid(path):
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"""This primarily exists to make unit testing easier."""
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return os.stat(path).st_gid
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def get_file_size(path):
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"""Returns the file size."""
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return os.stat(path).st_size
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def _get_disk_of_partition(devpath, st=None):
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"""Gets a disk device path and status from partition path.
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Returns a disk device path from a partition device path, and stat for
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the device. If devpath is not a partition, devpath is returned as it is.
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For example, '/dev/sda' is returned for '/dev/sda1', and '/dev/disk1' is
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for '/dev/disk1p1' ('p' is prepended to the partition number if the disk
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name ends with numbers).
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"""
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diskpath = re.sub(r'(?:(?<=\d)p)?\d+$', '', devpath)
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if diskpath != devpath:
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try:
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st_disk = os.stat(diskpath)
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if stat.S_ISBLK(st_disk.st_mode):
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return (diskpath, st_disk)
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except OSError:
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pass
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# devpath is not a partition
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if st is None:
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st = os.stat(devpath)
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return (devpath, st)
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def get_bool_param(param_string, params, default=False):
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param = params.get(param_string, default)
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if not strutils.is_valid_boolstr(param):
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msg = _("Value '%(param)s' for '%(param_string)s' is not "
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"a boolean.") % {'param': param, 'param_string': param_string}
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raise exception.InvalidParameterValue(err=msg)
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return strutils.bool_from_string(param, strict=True)
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def get_blkdev_major_minor(path, lookup_for_file=True):
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"""Get 'major:minor' number of block device.
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Get the device's 'major:minor' number of a block device to control
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I/O ratelimit of the specified path.
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If lookup_for_file is True and the path is a regular file, lookup a disk
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device which the file lies on and returns the result for the device.
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"""
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st = os.stat(path)
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if stat.S_ISBLK(st.st_mode):
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path, st = _get_disk_of_partition(path, st)
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return '%d:%d' % (os.major(st.st_rdev), os.minor(st.st_rdev))
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elif stat.S_ISCHR(st.st_mode):
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# No I/O ratelimit control is provided for character devices
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return None
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elif lookup_for_file:
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# lookup the mounted disk which the file lies on
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out, _err = execute('df', path)
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devpath = out.split("\n")[1].split()[0]
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if devpath[0] != '/':
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# the file is on a network file system
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return None
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return get_blkdev_major_minor(devpath, False)
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else:
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msg = _("Unable to get a block device for file \'%s\'") % path
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raise exception.CinderException(msg)
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def check_string_length(value, name, min_length=0, max_length=None,
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allow_all_spaces=True):
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"""Check the length of specified string.
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:param value: the value of the string
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|
:param name: the name of the string
|
|
:param min_length: the min_length of the string
|
|
:param max_length: the max_length of the string
|
|
"""
|
|
try:
|
|
strutils.check_string_length(value, name=name,
|
|
min_length=min_length,
|
|
max_length=max_length)
|
|
except(ValueError, TypeError) as exc:
|
|
raise exception.InvalidInput(reason=exc)
|
|
|
|
if not allow_all_spaces and value.isspace():
|
|
msg = _('%(name)s cannot be all spaces.')
|
|
raise exception.InvalidInput(reason=msg)
|
|
|
|
|
|
def is_blk_device(dev):
|
|
try:
|
|
if stat.S_ISBLK(os.stat(dev).st_mode):
|
|
return True
|
|
return False
|
|
except Exception:
|
|
LOG.debug('Path %s not found in is_blk_device check', dev)
|
|
return False
|
|
|
|
|
|
class ComparableMixin(object):
|
|
def _compare(self, other, method):
|
|
try:
|
|
return method(self._cmpkey(), other._cmpkey())
|
|
except (AttributeError, TypeError):
|
|
# _cmpkey not implemented, or return different type,
|
|
# so I can't compare with "other".
|
|
return NotImplemented
|
|
|
|
def __lt__(self, other):
|
|
return self._compare(other, lambda s, o: s < o)
|
|
|
|
def __le__(self, other):
|
|
return self._compare(other, lambda s, o: s <= o)
|
|
|
|
def __eq__(self, other):
|
|
return self._compare(other, lambda s, o: s == o)
|
|
|
|
def __ge__(self, other):
|
|
return self._compare(other, lambda s, o: s >= o)
|
|
|
|
def __gt__(self, other):
|
|
return self._compare(other, lambda s, o: s > o)
|
|
|
|
def __ne__(self, other):
|
|
return self._compare(other, lambda s, o: s != o)
|
|
|
|
|
|
def retry(exceptions, interval=1, retries=3, backoff_rate=2,
|
|
wait_random=False):
|
|
|
|
if retries < 1:
|
|
raise ValueError('Retries must be greater than or '
|
|
'equal to 1 (received: %s). ' % retries)
|
|
|
|
if wait_random:
|
|
wait = tenacity.wait_random_exponential(multiplier=interval)
|
|
else:
|
|
wait = tenacity.wait_exponential(
|
|
multiplier=interval, min=0, exp_base=backoff_rate)
|
|
|
|
def _decorator(f):
|
|
|
|
@functools.wraps(f)
|
|
def _wrapper(*args, **kwargs):
|
|
r = tenacity.Retrying(
|
|
sleep=tenacity.nap.sleep,
|
|
before_sleep=tenacity.before_sleep_log(LOG, logging.DEBUG),
|
|
after=tenacity.after_log(LOG, logging.DEBUG),
|
|
stop=tenacity.stop_after_attempt(retries),
|
|
reraise=True,
|
|
retry=tenacity.retry_if_exception_type(exceptions),
|
|
wait=wait)
|
|
return r.call(f, *args, **kwargs)
|
|
|
|
return _wrapper
|
|
|
|
return _decorator
|
|
|
|
|
|
def convert_str(text):
|
|
"""Convert to native string.
|
|
|
|
Convert bytes and Unicode strings to native strings:
|
|
|
|
* convert to bytes on Python 2:
|
|
encode Unicode using encodeutils.safe_encode()
|
|
* convert to Unicode on Python 3: decode bytes from UTF-8
|
|
"""
|
|
if isinstance(text, bytes):
|
|
return text.decode('utf-8')
|
|
else:
|
|
return text
|
|
|
|
|
|
def build_or_str(elements, str_format=None):
|
|
"""Builds a string of elements joined by 'or'.
|
|
|
|
Will join strings with the 'or' word and if a str_format is provided it
|
|
will be used to format the resulted joined string.
|
|
If there are no elements an empty string will be returned.
|
|
|
|
:param elements: Elements we want to join.
|
|
:type elements: String or iterable of strings.
|
|
:param str_format: String to use to format the response.
|
|
:type str_format: String.
|
|
"""
|
|
if not elements:
|
|
return ''
|
|
|
|
if not isinstance(elements, str):
|
|
elements = _(' or ').join(elements)
|
|
|
|
if str_format:
|
|
return str_format % elements
|
|
return elements
|
|
|
|
|
|
def calculate_virtual_free_capacity(total_capacity,
|
|
free_capacity,
|
|
provisioned_capacity,
|
|
thin_provisioning_support,
|
|
max_over_subscription_ratio,
|
|
reserved_percentage,
|
|
thin):
|
|
"""Calculate the virtual free capacity based on thin provisioning support.
|
|
|
|
:param total_capacity: total_capacity_gb of a host_state or pool.
|
|
:param free_capacity: free_capacity_gb of a host_state or pool.
|
|
:param provisioned_capacity: provisioned_capacity_gb of a host_state
|
|
or pool.
|
|
:param thin_provisioning_support: thin_provisioning_support of
|
|
a host_state or a pool.
|
|
:param max_over_subscription_ratio: max_over_subscription_ratio of
|
|
a host_state or a pool
|
|
:param reserved_percentage: reserved_percentage of a host_state or
|
|
a pool.
|
|
:param thin: whether volume to be provisioned is thin
|
|
:returns: the calculated virtual free capacity.
|
|
"""
|
|
|
|
total = float(total_capacity)
|
|
reserved = float(reserved_percentage) / 100
|
|
|
|
if thin and thin_provisioning_support:
|
|
free = (total * max_over_subscription_ratio
|
|
- provisioned_capacity
|
|
- math.floor(total * reserved))
|
|
else:
|
|
# Calculate how much free space is left after taking into
|
|
# account the reserved space.
|
|
free = free_capacity - math.floor(total * reserved)
|
|
return free
|
|
|
|
|
|
def calculate_max_over_subscription_ratio(capability,
|
|
global_max_over_subscription_ratio):
|
|
# provisioned_capacity_gb is the apparent total capacity of
|
|
# all the volumes created on a backend, which is greater than
|
|
# or equal to allocated_capacity_gb, which is the apparent
|
|
# total capacity of all the volumes created on a backend
|
|
# in Cinder. Using allocated_capacity_gb as the default of
|
|
# provisioned_capacity_gb if it is not set.
|
|
allocated_capacity_gb = capability.get('allocated_capacity_gb', 0)
|
|
provisioned_capacity_gb = capability.get('provisioned_capacity_gb',
|
|
allocated_capacity_gb)
|
|
thin_provisioning_support = capability.get('thin_provisioning_support',
|
|
False)
|
|
total_capacity_gb = capability.get('total_capacity_gb', 0)
|
|
free_capacity_gb = capability.get('free_capacity_gb', 0)
|
|
pool_name = capability.get('pool_name',
|
|
capability.get('volume_backend_name'))
|
|
|
|
# If thin provisioning is not supported the capacity filter will not use
|
|
# the value we return, no matter what it is.
|
|
if not thin_provisioning_support:
|
|
LOG.debug("Trying to retrieve max_over_subscription_ratio from a "
|
|
"service that does not support thin provisioning")
|
|
return 1.0
|
|
|
|
# Again, if total or free capacity is infinite or unknown, the capacity
|
|
# filter will not use the max_over_subscription_ratio at all. So, does
|
|
# not matter what we return here.
|
|
if ((total_capacity_gb in INFINITE_UNKNOWN_VALUES) or
|
|
(free_capacity_gb in INFINITE_UNKNOWN_VALUES)):
|
|
return 1.0
|
|
|
|
max_over_subscription_ratio = (capability.get(
|
|
'max_over_subscription_ratio') or global_max_over_subscription_ratio)
|
|
|
|
# We only calculate the automatic max_over_subscription_ratio (mosr)
|
|
# when the global or driver conf is set auto and while
|
|
# provisioned_capacity_gb is not 0. When auto is set and
|
|
# provisioned_capacity_gb is 0, we use the default value 20.0.
|
|
if max_over_subscription_ratio == 'auto':
|
|
if provisioned_capacity_gb != 0:
|
|
used_capacity = total_capacity_gb - free_capacity_gb
|
|
LOG.debug("Calculating max_over_subscription_ratio for "
|
|
"pool %s: provisioned_capacity_gb=%s, "
|
|
"used_capacity=%s",
|
|
pool_name, provisioned_capacity_gb, used_capacity)
|
|
max_over_subscription_ratio = 1 + (
|
|
float(provisioned_capacity_gb) / (used_capacity + 1))
|
|
else:
|
|
max_over_subscription_ratio = INITIAL_AUTO_MOSR
|
|
|
|
LOG.info("Auto max_over_subscription_ratio for pool %s is "
|
|
"%s", pool_name, max_over_subscription_ratio)
|
|
else:
|
|
max_over_subscription_ratio = float(max_over_subscription_ratio)
|
|
|
|
return max_over_subscription_ratio
|
|
|
|
|
|
def validate_dictionary_string_length(specs):
|
|
"""Check the length of each key and value of dictionary."""
|
|
if not isinstance(specs, dict):
|
|
msg = _('specs must be a dictionary.')
|
|
raise exception.InvalidInput(reason=msg)
|
|
|
|
for key, value in specs.items():
|
|
if key is not None:
|
|
check_string_length(key, 'Key "%s"' % key,
|
|
min_length=1, max_length=255)
|
|
|
|
if value is not None:
|
|
check_string_length(value, 'Value for key "%s"' % key,
|
|
min_length=0, max_length=255)
|
|
|
|
|
|
def service_expired_time(with_timezone=False):
|
|
return (timeutils.utcnow(with_timezone=with_timezone) -
|
|
datetime.timedelta(seconds=CONF.service_down_time))
|
|
|
|
|
|
class DoNothing(str):
|
|
"""Class that literrally does nothing.
|
|
|
|
We inherit from str in case it's called with json.dumps.
|
|
"""
|
|
def __call__(self, *args, **kwargs):
|
|
return self
|
|
|
|
def __getattr__(self, name):
|
|
return self
|
|
|
|
|
|
DO_NOTHING = DoNothing()
|
|
|
|
|
|
def notifications_enabled(conf):
|
|
"""Check if oslo notifications are enabled."""
|
|
notifications_driver = set(conf.oslo_messaging_notifications.driver)
|
|
return notifications_driver and notifications_driver != {'noop'}
|
|
|
|
|
|
def if_notifications_enabled(f):
|
|
"""Calls decorated method only if notifications are enabled."""
|
|
@functools.wraps(f)
|
|
def wrapped(*args, **kwargs):
|
|
if notifications_enabled(CONF):
|
|
return f(*args, **kwargs)
|
|
return DO_NOTHING
|
|
return wrapped
|
|
|
|
|
|
LOG_LEVELS = ('INFO', 'WARNING', 'ERROR', 'DEBUG')
|
|
|
|
|
|
def get_log_method(level_string):
|
|
level_string = level_string or ''
|
|
upper_level_string = level_string.upper()
|
|
if upper_level_string not in LOG_LEVELS:
|
|
raise exception.InvalidInput(
|
|
reason=_('%s is not a valid log level.') % level_string)
|
|
return getattr(logging, upper_level_string)
|
|
|
|
|
|
def set_log_levels(prefix, level_string):
|
|
level = get_log_method(level_string)
|
|
prefix = prefix or ''
|
|
|
|
for k, v in logging.get_loggers().items():
|
|
if k and k.startswith(prefix):
|
|
v.logger.setLevel(level)
|
|
|
|
|
|
def get_log_levels(prefix):
|
|
prefix = prefix or ''
|
|
return {k: logging.logging.getLevelName(v.logger.getEffectiveLevel())
|
|
for k, v in logging.get_loggers().items()
|
|
if k and k.startswith(prefix)}
|
|
|
|
|
|
def paths_normcase_equal(path_a, path_b):
|
|
return os.path.normcase(path_a) == os.path.normcase(path_b)
|
|
|
|
|
|
def create_ordereddict(adict):
|
|
"""Given a dict, return a sorted OrderedDict."""
|
|
return OrderedDict(sorted(adict.items(),
|
|
key=operator.itemgetter(0)))
|
|
|
|
|
|
class Semaphore(object):
|
|
"""Custom semaphore to workaround eventlet issues with multiprocessing."""
|
|
def __init__(self, limit):
|
|
self.limit = limit
|
|
self.semaphore = multiprocessing.Semaphore(limit)
|
|
|
|
def __enter__(self):
|
|
# Eventlet does not work with multiprocessing's Semaphore, so we have
|
|
# to execute it in a native thread to avoid getting blocked when trying
|
|
# to acquire the semaphore.
|
|
return tpool.execute(self.semaphore.__enter__)
|
|
|
|
def __exit__(self, *args):
|
|
# Don't use native thread for exit, as it will only add overhead
|
|
return self.semaphore.__exit__(*args)
|
|
|
|
|
|
def semaphore_factory(limit, concurrent_processes):
|
|
"""Get a semaphore to limit concurrent operations.
|
|
|
|
The semaphore depends on the limit we want to set and the concurrent
|
|
processes that need to be limited.
|
|
"""
|
|
# Limit of 0 is no limit, so we won't use a semaphore
|
|
if limit:
|
|
# If we only have 1 process we can use eventlet's Semaphore
|
|
if concurrent_processes == 1:
|
|
return eventlet.Semaphore(limit)
|
|
# Use our own Sempahore for interprocess because eventlet blocks with
|
|
# the standard one
|
|
return Semaphore(limit)
|
|
return contextlib.suppress()
|
|
|
|
|
|
def limit_operations(func):
|
|
"""Decorator to limit the number of concurrent operations.
|
|
|
|
This method decorator expects to have a _semaphore attribute holding an
|
|
initialized semaphore in the self instance object.
|
|
|
|
We can get the appropriate semaphore with the semaphore_factory method.
|
|
"""
|
|
@functools.wraps(func)
|
|
def wrapper(self, *args, **kwargs):
|
|
with self._semaphore:
|
|
return func(self, *args, **kwargs)
|
|
return wrapper
|