OpenStack Block Storage (Cinder)
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# Copyright (c) 2012 NetApp, Inc. All rights reserved.
# Copyright (c) 2014 Navneet Singh. All rights reserved.
# Copyright (c) 2014 Clinton Knight. All rights reserved.
# Copyright (c) 2015 Tom Barron. All rights reserved.
# Copyright (c) 2016 Michael Price. All rights reserved.
#
# 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.
"""
Utilities for NetApp drivers.
This module contains common utilities to be used by one or more
NetApp drivers to achieve the desired functionality.
"""
import decimal
import platform
import re
from oslo_concurrency import processutils as putils
from oslo_log import log as logging
from oslo_utils import netutils
import six
from cinder import context
from cinder import exception
from cinder.i18n import _
from cinder import utils
from cinder import version
from cinder.volume import qos_specs
from cinder.volume import volume_types
LOG = logging.getLogger(__name__)
OPENSTACK_PREFIX = 'openstack-'
OBSOLETE_SSC_SPECS = {'netapp:raid_type': 'netapp_raid_type',
'netapp:disk_type': 'netapp_disk_type'}
DEPRECATED_SSC_SPECS = {'netapp_unmirrored': 'netapp_mirrored',
'netapp_nodedup': 'netapp_dedup',
'netapp_nocompression': 'netapp_compression',
'netapp_thick_provisioned': 'netapp_thin_provisioned'}
QOS_KEYS = frozenset(['maxIOPS', 'maxIOPSperGiB', 'maxBPS', 'maxBPSperGiB'])
BACKEND_QOS_CONSUMERS = frozenset(['back-end', 'both'])
# Secret length cannot be less than 96 bits. http://tools.ietf.org/html/rfc3723
CHAP_SECRET_LENGTH = 16
DEFAULT_CHAP_USER_NAME = 'NetApp_iSCSI_CHAP_Username'
API_TRACE_PATTERN = '(.*)'
def validate_instantiation(**kwargs):
"""Checks if a driver is instantiated other than by the unified driver.
Helps check direct instantiation of netapp drivers.
Call this function in every netapp block driver constructor.
"""
if kwargs and kwargs.get('netapp_mode') == 'proxy':
return
LOG.warning("It is not the recommended way to use drivers by NetApp. "
"Please use NetAppDriver to achieve the functionality.")
def check_flags(required_flags, configuration):
"""Ensure that the flags we care about are set."""
for flag in required_flags:
if not getattr(configuration, flag, None):
msg = _('Configuration value %s is not set.') % flag
raise exception.InvalidInput(reason=msg)
def to_bool(val):
"""Converts true, yes, y, 1 to True, False otherwise."""
if val:
strg = six.text_type(val).lower()
if (strg == 'true' or strg == 'y'
or strg == 'yes' or strg == 'enabled'
or strg == '1'):
return True
else:
return False
else:
return False
@utils.synchronized("safe_set_attr")
def set_safe_attr(instance, attr, val):
"""Sets the attribute in a thread safe manner.
Returns if new val was set on attribute.
If attr already had the value then False.
"""
if not instance or not attr:
return False
old_val = getattr(instance, attr, None)
if val is None and old_val is None:
return False
elif val == old_val:
return False
else:
setattr(instance, attr, val)
return True
def get_volume_extra_specs(volume):
"""Provides extra specs associated with volume."""
ctxt = context.get_admin_context()
type_id = volume.get('volume_type_id')
if type_id is None:
return {}
volume_type = volume_types.get_volume_type(ctxt, type_id)
if volume_type is None:
return {}
extra_specs = volume_type.get('extra_specs', {})
log_extra_spec_warnings(extra_specs)
return extra_specs
def setup_api_trace_pattern(api_trace_pattern):
global API_TRACE_PATTERN
try:
re.compile(api_trace_pattern)
except (re.error, TypeError):
msg = _('Cannot parse the API trace pattern. %s is not a '
'valid python regular expression.') % api_trace_pattern
raise exception.InvalidConfigurationValue(reason=msg)
API_TRACE_PATTERN = api_trace_pattern
def trace_filter_func_api(all_args):
na_element = all_args.get('na_element')
if na_element is None:
return True
api_name = na_element.get_name()
return re.match(API_TRACE_PATTERN, api_name) is not None
def round_down(value, precision='0.00'):
return float(decimal.Decimal(six.text_type(value)).quantize(
decimal.Decimal(precision), rounding=decimal.ROUND_DOWN))
def log_extra_spec_warnings(extra_specs):
for spec in (set(extra_specs.keys() if extra_specs else []) &
set(OBSOLETE_SSC_SPECS.keys())):
LOG.warning('Extra spec %(old)s is obsolete. Use %(new)s '
'instead.', {'old': spec,
'new': OBSOLETE_SSC_SPECS[spec]})
for spec in (set(extra_specs.keys() if extra_specs else []) &
set(DEPRECATED_SSC_SPECS.keys())):
LOG.warning('Extra spec %(old)s is deprecated. Use %(new)s '
'instead.', {'old': spec,
'new': DEPRECATED_SSC_SPECS[spec]})
def get_iscsi_connection_properties(lun_id, volume, iqns,
addresses, ports):
# literal ipv6 address
addresses = [netutils.escape_ipv6(a) if netutils.is_valid_ipv6(a) else a
for a in addresses]
lun_id = int(lun_id)
if isinstance(iqns, six.string_types):
iqns = [iqns] * len(addresses)
target_portals = ['%s:%s' % (a, p) for a, p in zip(addresses, ports)]
properties = {}
properties['target_discovered'] = False
properties['target_portal'] = target_portals[0]
properties['target_iqn'] = iqns[0]
properties['target_lun'] = lun_id
properties['volume_id'] = volume['id']
if len(addresses) > 1:
properties['target_portals'] = target_portals
properties['target_iqns'] = iqns
properties['target_luns'] = [lun_id] * len(addresses)
auth = volume['provider_auth']
if auth:
(auth_method, auth_username, auth_secret) = auth.split()
properties['auth_method'] = auth_method
properties['auth_username'] = auth_username
properties['auth_password'] = auth_secret
return {
'driver_volume_type': 'iscsi',
'data': properties,
}
def validate_qos_spec(qos_spec):
"""Check validity of Cinder qos spec for our backend."""
if qos_spec is None:
return
normalized_qos_keys = [key.lower() for key in QOS_KEYS]
keylist = []
for key, value in qos_spec.items():
lower_case_key = key.lower()
if lower_case_key not in normalized_qos_keys:
msg = _('Unrecognized QOS keyword: "%s"') % key
raise exception.Invalid(msg)
keylist.append(lower_case_key)
# Modify the following check when we allow multiple settings in one spec.
if len(keylist) > 1:
msg = _('Only one limit can be set in a QoS spec.')
raise exception.Invalid(msg)
def get_volume_type_from_volume(volume):
"""Provides volume type associated with volume."""
type_id = volume.get('volume_type_id')
if type_id is None:
return {}
ctxt = context.get_admin_context()
return volume_types.get_volume_type(ctxt, type_id)
def map_qos_spec(qos_spec, volume):
"""Map Cinder QOS spec to limit/throughput-value as used in client API."""
if qos_spec is None:
return None
qos_spec = map_dict_to_lower(qos_spec)
spec = dict(policy_name=get_qos_policy_group_name(volume),
max_throughput=None)
# QoS specs are exclusive of one another.
if 'maxiops' in qos_spec:
spec['max_throughput'] = '%siops' % qos_spec['maxiops']
elif 'maxiopspergib' in qos_spec:
spec['max_throughput'] = '%siops' % six.text_type(
int(qos_spec['maxiopspergib']) * int(volume['size']))
elif 'maxbps' in qos_spec:
spec['max_throughput'] = '%sB/s' % qos_spec['maxbps']
elif 'maxbpspergib' in qos_spec:
spec['max_throughput'] = '%sB/s' % six.text_type(
int(qos_spec['maxbpspergib']) * int(volume['size']))
return spec
def map_dict_to_lower(input_dict):
"""Return an equivalent to the input dictionary with lower-case keys."""
lower_case_dict = {}
for key in input_dict:
lower_case_dict[key.lower()] = input_dict[key]
return lower_case_dict
def get_qos_policy_group_name(volume):
"""Return the name of backend QOS policy group based on its volume id."""
if 'id' in volume:
return OPENSTACK_PREFIX + volume['id']
return None
def get_qos_policy_group_name_from_info(qos_policy_group_info):
"""Return the name of a QOS policy group given qos policy group info."""
if qos_policy_group_info is None:
return None
legacy = qos_policy_group_info.get('legacy')
if legacy is not None:
return legacy['policy_name']
spec = qos_policy_group_info.get('spec')
if spec is not None:
return spec['policy_name']
return None
def get_pool_name_filter_regex(configuration):
"""Build the regex for filtering pools by name
:param configuration: The volume driver configuration
:raise InvalidConfigurationValue: if configured regex pattern is invalid
:returns: A compiled regex for filtering pool names
"""
# If the configuration parameter is specified as an empty string
# (interpreted as matching all pools), we replace it here with
# (.+) to be explicit with CSV compatibility support implemented below.
pool_patterns = configuration.netapp_pool_name_search_pattern or r'(.+)'
# Strip whitespace from start/end and then 'or' all regex patterns
pool_patterns = '|'.join(['^' + pool_pattern.strip('^$ \t') + '$' for
pool_pattern in pool_patterns.split(',')])
try:
return re.compile(pool_patterns)
except re.error:
raise exception.InvalidConfigurationValue(
option='netapp_pool_name_search_pattern',
value=configuration.netapp_pool_name_search_pattern)
def get_valid_qos_policy_group_info(volume, extra_specs=None):
"""Given a volume, return information for QOS provisioning."""
info = dict(legacy=None, spec=None)
try:
volume_type = get_volume_type_from_volume(volume)
except KeyError:
LOG.exception('Cannot get QoS spec for volume %s.', volume['id'])
return info
if volume_type is None:
return info
if extra_specs is None:
extra_specs = volume_type.get('extra_specs', {})
info['legacy'] = get_legacy_qos_policy(extra_specs)
info['spec'] = get_valid_backend_qos_spec_from_volume_type(volume,
volume_type)
msg = 'QoS policy group info for volume %(vol)s: %(info)s'
LOG.debug(msg, {'vol': volume['name'], 'info': info})
check_for_invalid_qos_spec_combination(info, volume_type)
return info
def get_valid_backend_qos_spec_from_volume_type(volume, volume_type):
"""Given a volume type, return the associated Cinder QoS spec."""
spec_key_values = get_backend_qos_spec_from_volume_type(volume_type)
if spec_key_values is None:
return None
validate_qos_spec(spec_key_values)
return map_qos_spec(spec_key_values, volume)
def get_backend_qos_spec_from_volume_type(volume_type):
qos_specs_id = volume_type.get('qos_specs_id')
if qos_specs_id is None:
return None
ctxt = context.get_admin_context()
qos_spec = qos_specs.get_qos_specs(ctxt, qos_specs_id)
if qos_spec is None:
return None
consumer = qos_spec['consumer']
# Front end QoS specs are handled by libvirt and we ignore them here.
if consumer not in BACKEND_QOS_CONSUMERS:
return None
spec_key_values = qos_spec['specs']
return spec_key_values
def check_for_invalid_qos_spec_combination(info, volume_type):
"""Invalidate QOS spec if both legacy and non-legacy info is present."""
if info['legacy'] and info['spec']:
msg = _('Conflicting QoS specifications in volume type '
'%s: when QoS spec is associated to volume '
'type, legacy "netapp:qos_policy_group" is not allowed in '
'the volume type extra specs.') % volume_type['id']
raise exception.Invalid(msg)
def get_legacy_qos_policy(extra_specs):
"""Return legacy qos policy information if present in extra specs."""
external_policy_name = extra_specs.get('netapp:qos_policy_group')
if external_policy_name is None:
return None
return dict(policy_name=external_policy_name)
def get_export_host_junction_path(share):
if '[' in share and ']' in share:
try:
# ipv6
host = re.search(r'\[(.*)\]', share).group(1)
junction_path = share.split(':')[-1]
except AttributeError:
raise exception.NetAppDriverException(_("Share '%s' is "
"not in a valid "
"format.") % share)
else:
# ipv4
path = share.split(':')
if len(path) == 2:
host = path[0]
junction_path = path[1]
else:
raise exception.NetAppDriverException(_("Share '%s' is "
"not in a valid "
"format.") % share)
return host, junction_path
class hashabledict(dict):
"""A hashable dictionary that is comparable (i.e. in unit tests, etc.)"""
def __hash__(self):
return hash(tuple(sorted(self.items())))
class OpenStackInfo(object):
"""OS/distribution, release, and version.
NetApp uses these fields as content for EMS log entry.
"""
PACKAGE_NAME = 'python-cinder'
def __init__(self):
self._version = 'unknown version'
self._release = 'unknown release'
self._vendor = 'unknown vendor'
self._platform = 'unknown platform'
def _update_version_from_version_string(self):
try:
self._version = version.version_info.version_string()
except Exception:
pass
def _update_release_from_release_string(self):
try:
self._release = version.version_info.release_string()
except Exception:
pass
def _update_platform(self):
try:
self._platform = platform.platform()
except Exception:
pass
@staticmethod
def _get_version_info_version():
return version.version_info.version
@staticmethod
def _get_version_info_release():
return version.version_info.release
def _update_info_from_version_info(self):
try:
ver = self._get_version_info_version()
if ver:
self._version = ver
except Exception:
pass
try:
rel = self._get_version_info_release()
if rel:
self._release = rel
except Exception:
pass
# RDO, RHEL-OSP, Mirantis on Redhat, SUSE
def _update_info_from_rpm(self):
LOG.debug('Trying rpm command.')
try:
out, err = putils.execute("rpm", "-q", "--queryformat",
"'%{version}\t%{release}\t%{vendor}'",
self.PACKAGE_NAME)
if not out:
LOG.info('No rpm info found for %(pkg)s package.', {
'pkg': self.PACKAGE_NAME})
return False
parts = out.split()
self._version = parts[0]
self._release = parts[1]
self._vendor = ' '.join(parts[2::])
return True
except Exception as e:
LOG.info('Could not run rpm command: %(msg)s.', {'msg': e})
return False
# ubuntu, mirantis on ubuntu
def _update_info_from_dpkg(self):
LOG.debug('Trying dpkg-query command.')
try:
_vendor = None
out, err = putils.execute("dpkg-query", "-W", "-f='${Version}'",
self.PACKAGE_NAME)
if not out:
LOG.info('No dpkg-query info found for %(pkg)s package.',
{'pkg': self.PACKAGE_NAME})
return False
# debian format: [epoch:]upstream_version[-debian_revision]
deb_version = out
# in case epoch or revision is missing, copy entire string
_release = deb_version
if ':' in deb_version:
deb_epoch, upstream_version = deb_version.split(':')
_release = upstream_version
if '-' in deb_version:
deb_revision = deb_version.split('-')[1]
_vendor = deb_revision
self._release = _release
if _vendor:
self._vendor = _vendor
return True
except Exception as e:
LOG.info('Could not run dpkg-query command: %(msg)s.', {
'msg': e})
return False
def _update_openstack_info(self):
self._update_version_from_version_string()
self._update_release_from_release_string()
self._update_platform()
# some distributions override with more meaningful information
self._update_info_from_version_info()
# see if we have still more targeted info from rpm or apt
found_package = self._update_info_from_rpm()
if not found_package:
self._update_info_from_dpkg()
def info(self):
self._update_openstack_info()
return '%(version)s|%(release)s|%(vendor)s|%(platform)s' % {
'version': self._version, 'release': self._release,
'vendor': self._vendor, 'platform': self._platform}
class Features(object):
def __init__(self):
self.defined_features = set()
def add_feature(self, name, supported=True, min_version=None):
if not isinstance(supported, bool):
raise TypeError("Feature value must be a bool type.")
self.defined_features.add(name)
setattr(self, name, FeatureState(supported, min_version))
def __getattr__(self, name):
# NOTE(cknight): Needed to keep pylint happy.
raise AttributeError
class FeatureState(object):
def __init__(self, supported=True, minimum_version=None):
"""Represents the current state of enablement for a Feature
:param supported: True if supported, false otherwise
:param minimum_version: The minimum version that this feature is
supported at
"""
self.supported = supported
self.minimum_version = minimum_version
def __nonzero__(self):
"""Allow a FeatureState object to be tested for truth value
:returns: True if the feature is supported, otherwise False
"""
return self.supported
def __bool__(self):
"""py3 Allow a FeatureState object to be tested for truth value
:returns: True if the feature is supported, otherwise False
"""
return self.supported
class BitSet(object):
def __init__(self, value=0):
self._value = value
def set(self, bit):
self._value |= 1 << bit
return self
def unset(self, bit):
self._value &= ~(1 << bit)
return self
def is_set(self, bit):
return self._value & 1 << bit
def __and__(self, other):
self._value &= other
return self
def __or__(self, other):
self._value |= other
return self
def __invert__(self):
self._value = ~self._value
return self
def __xor__(self, other):
self._value ^= other
return self
def __lshift__(self, other):
self._value <<= other
return self
def __rshift__(self, other):
self._value >>= other
return self
def __int__(self):
return self._value
def __str__(self):
return bin(self._value)
def __repr__(self):
return str(self._value)
def __eq__(self, other):
return (isinstance(other, self.__class__) and self._value ==
other._value) or self._value == int(other)
def __ne__(self, other):
return not self.__eq__(other)