openstack/cinder
Code Issues Proposed changes
cinder/cinder/volume/utils.py
wangxiyuan 8a736209ed Convert marker format for listing manageable resources 
The marker for listing manageable resources is the "reference"
property which should be dict.

We should convert and check its format before using.

Change-Id: I190ff8506e0056d685ce429c2fa275b097f9e635
Closes-bug: #1657992
2017-05-22 12:21:03 +00:00

964 lines
32 KiB
Python
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# Copyright (c) 2012 OpenStack Foundation
#
# 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.
"""Volume-related Utilities and helpers."""
import ast
import functools
import json
import math
import operator
from os import urandom
import re
import time
import uuid
import eventlet
from eventlet import tpool
from oslo_concurrency import processutils
from oslo_config import cfg
from oslo_log import log as logging
from oslo_utils import strutils
from oslo_utils import timeutils
from oslo_utils import units
from random import shuffle
import six
from six.moves import range
from cinder.brick.local_dev import lvm as brick_lvm
from cinder import context
from cinder import db
from cinder import exception
from cinder.i18n import _
from cinder import objects
from cinder import rpc
from cinder import utils
from cinder.volume import group_types
from cinder.volume import throttling
from cinder.volume import volume_types
CONF = cfg.CONF
LOG = logging.getLogger(__name__)
def null_safe_str(s):
return str(s) if s else ''
def _usage_from_volume(context, volume_ref, **kw):
now = timeutils.utcnow()
launched_at = volume_ref['launched_at'] or now
created_at = volume_ref['created_at'] or now
volume_status = volume_ref['status']
if volume_status == 'error_managing_deleting':
volume_status = 'deleting'
usage_info = dict(
tenant_id=volume_ref['project_id'],
host=volume_ref['host'],
user_id=volume_ref['user_id'],
availability_zone=volume_ref['availability_zone'],
volume_id=volume_ref['id'],
volume_type=volume_ref['volume_type_id'],
display_name=volume_ref['display_name'],
launched_at=launched_at.isoformat(),
created_at=created_at.isoformat(),
status=volume_status,
snapshot_id=volume_ref['snapshot_id'],
size=volume_ref['size'],
replication_status=volume_ref['replication_status'],
replication_extended_status=volume_ref['replication_extended_status'],
replication_driver_data=volume_ref['replication_driver_data'],
metadata=volume_ref.get('volume_metadata'),)
usage_info.update(kw)
try:
attachments = db.volume_attachment_get_all_by_volume_id(
context, volume_ref['id'])
usage_info['volume_attachment'] = attachments
glance_meta = db.volume_glance_metadata_get(context, volume_ref['id'])
if glance_meta:
usage_info['glance_metadata'] = glance_meta
except exception.GlanceMetadataNotFound:
pass
except exception.VolumeNotFound:
LOG.debug("Can not find volume %s at notify usage", volume_ref['id'])
return usage_info
def _usage_from_backup(backup, **kw):
num_dependent_backups = backup.num_dependent_backups
usage_info = dict(tenant_id=backup.project_id,
user_id=backup.user_id,
availability_zone=backup.availability_zone,
backup_id=backup.id,
host=backup.host,
display_name=backup.display_name,
created_at=str(backup.created_at),
status=backup.status,
volume_id=backup.volume_id,
size=backup.size,
service_metadata=backup.service_metadata,
service=backup.service,
fail_reason=backup.fail_reason,
parent_id=backup.parent_id,
num_dependent_backups=num_dependent_backups,
snapshot_id=backup.snapshot_id,
)
usage_info.update(kw)
return usage_info
@utils.if_notifications_enabled
def notify_about_volume_usage(context, volume, event_suffix,
extra_usage_info=None, host=None):
if not host:
host = CONF.host
if not extra_usage_info:
extra_usage_info = {}
usage_info = _usage_from_volume(context, volume, **extra_usage_info)
rpc.get_notifier("volume", host).info(context, 'volume.%s' % event_suffix,
usage_info)
@utils.if_notifications_enabled
def notify_about_backup_usage(context, backup, event_suffix,
extra_usage_info=None,
host=None):
if not host:
host = CONF.host
if not extra_usage_info:
extra_usage_info = {}
usage_info = _usage_from_backup(backup, **extra_usage_info)
rpc.get_notifier("backup", host).info(context, 'backup.%s' % event_suffix,
usage_info)
def _usage_from_snapshot(snapshot, context, **extra_usage_info):
# (niedbalski) a snapshot might be related to a deleted
# volume, if that's the case, the volume information is still
# required for filling the usage_info, so we enforce to read
# the volume data even if the volume has been deleted.
context.read_deleted = "yes"
volume = db.volume_get(context, snapshot.volume_id)
usage_info = {
'tenant_id': snapshot.project_id,
'user_id': snapshot.user_id,
'availability_zone': volume['availability_zone'],
'volume_id': snapshot.volume_id,
'volume_size': snapshot.volume_size,
'snapshot_id': snapshot.id,
'display_name': snapshot.display_name,
'created_at': str(snapshot.created_at),
'status': snapshot.status,
'deleted': null_safe_str(snapshot.deleted),
'metadata': null_safe_str(snapshot.metadata),
}
usage_info.update(extra_usage_info)
return usage_info
@utils.if_notifications_enabled
def notify_about_snapshot_usage(context, snapshot, event_suffix,
extra_usage_info=None, host=None):
if not host:
host = CONF.host
if not extra_usage_info:
extra_usage_info = {}
usage_info = _usage_from_snapshot(snapshot, context, **extra_usage_info)
rpc.get_notifier('snapshot', host).info(context,
'snapshot.%s' % event_suffix,
usage_info)
def _usage_from_capacity(capacity, **extra_usage_info):
capacity_info = {
'name_to_id': capacity['name_to_id'],
'total': capacity['total'],
'free': capacity['free'],
'allocated': capacity['allocated'],
'provisioned': capacity['provisioned'],
'virtual_free': capacity['virtual_free'],
'reported_at': capacity['reported_at']
}
capacity_info.update(extra_usage_info)
return capacity_info
@utils.if_notifications_enabled
def notify_about_capacity_usage(context, capacity, suffix,
extra_usage_info=None, host=None):
if not host:
host = CONF.host
if not extra_usage_info:
extra_usage_info = {}
usage_info = _usage_from_capacity(capacity, **extra_usage_info)
rpc.get_notifier('capacity', host).info(context,
'capacity.%s' % suffix,
usage_info)
@utils.if_notifications_enabled
def notify_about_replication_usage(context, volume, suffix,
extra_usage_info=None, host=None):
if not host:
host = CONF.host
if not extra_usage_info:
extra_usage_info = {}
usage_info = _usage_from_volume(context, volume,
**extra_usage_info)
rpc.get_notifier('replication', host).info(context,
'replication.%s' % suffix,
usage_info)
@utils.if_notifications_enabled
def notify_about_replication_error(context, volume, suffix,
extra_error_info=None, host=None):
if not host:
host = CONF.host
if not extra_error_info:
extra_error_info = {}
usage_info = _usage_from_volume(context, volume,
**extra_error_info)
rpc.get_notifier('replication', host).error(context,
'replication.%s' % suffix,
usage_info)
def _usage_from_consistencygroup(group_ref, **kw):
usage_info = dict(tenant_id=group_ref.project_id,
user_id=group_ref.user_id,
availability_zone=group_ref.availability_zone,
consistencygroup_id=group_ref.id,
name=group_ref.name,
created_at=group_ref.created_at.isoformat(),
status=group_ref.status)
usage_info.update(kw)
return usage_info
@utils.if_notifications_enabled
def notify_about_consistencygroup_usage(context, group, event_suffix,
extra_usage_info=None, host=None):
if not host:
host = CONF.host
if not extra_usage_info:
extra_usage_info = {}
usage_info = _usage_from_consistencygroup(group,
**extra_usage_info)
rpc.get_notifier("consistencygroup", host).info(
context,
'consistencygroup.%s' % event_suffix,
usage_info)
def _usage_from_group(group_ref, **kw):
usage_info = dict(tenant_id=group_ref.project_id,
user_id=group_ref.user_id,
availability_zone=group_ref.availability_zone,
group_id=group_ref.id,
group_type=group_ref.group_type_id,
name=group_ref.name,
created_at=group_ref.created_at.isoformat(),
status=group_ref.status)
usage_info.update(kw)
return usage_info
@utils.if_notifications_enabled
def notify_about_group_usage(context, group, event_suffix,
extra_usage_info=None, host=None):
if not host:
host = CONF.host
if not extra_usage_info:
extra_usage_info = {}
usage_info = _usage_from_group(group,
**extra_usage_info)
rpc.get_notifier("group", host).info(
context,
'group.%s' % event_suffix,
usage_info)
def _usage_from_cgsnapshot(cgsnapshot, **kw):
usage_info = dict(
tenant_id=cgsnapshot.project_id,
user_id=cgsnapshot.user_id,
cgsnapshot_id=cgsnapshot.id,
name=cgsnapshot.name,
consistencygroup_id=cgsnapshot.consistencygroup_id,
created_at=cgsnapshot.created_at.isoformat(),
status=cgsnapshot.status)
usage_info.update(kw)
return usage_info
def _usage_from_group_snapshot(group_snapshot, **kw):
usage_info = dict(
tenant_id=group_snapshot.project_id,
user_id=group_snapshot.user_id,
group_snapshot_id=group_snapshot.id,
name=group_snapshot.name,
group_id=group_snapshot.group_id,
group_type=group_snapshot.group_type_id,
created_at=group_snapshot.created_at.isoformat(),
status=group_snapshot.status)
usage_info.update(kw)
return usage_info
@utils.if_notifications_enabled
def notify_about_cgsnapshot_usage(context, cgsnapshot, event_suffix,
extra_usage_info=None, host=None):
if not host:
host = CONF.host
if not extra_usage_info:
extra_usage_info = {}
usage_info = _usage_from_cgsnapshot(cgsnapshot,
**extra_usage_info)
rpc.get_notifier("cgsnapshot", host).info(
context,
'cgsnapshot.%s' % event_suffix,
usage_info)
@utils.if_notifications_enabled
def notify_about_group_snapshot_usage(context, group_snapshot, event_suffix,
extra_usage_info=None, host=None):
if not host:
host = CONF.host
if not extra_usage_info:
extra_usage_info = {}
usage_info = _usage_from_group_snapshot(group_snapshot,
**extra_usage_info)
rpc.get_notifier("group_snapshot", host).info(
context,
'group_snapshot.%s' % event_suffix,
usage_info)
def _check_blocksize(blocksize):
# Check if volume_dd_blocksize is valid
try:
# Rule out zero-sized/negative/float dd blocksize which
# cannot be caught by strutils
if blocksize.startswith(('-', '0')) or '.' in blocksize:
raise ValueError
strutils.string_to_bytes('%sB' % blocksize)
except ValueError:
LOG.warning("Incorrect value error: %(blocksize)s, "
"it may indicate that \'volume_dd_blocksize\' "
"was configured incorrectly. Fall back to default.",
{'blocksize': blocksize})
# Fall back to default blocksize
CONF.clear_override('volume_dd_blocksize')
blocksize = CONF.volume_dd_blocksize
return blocksize
def check_for_odirect_support(src, dest, flag='oflag=direct'):
# Check whether O_DIRECT is supported
try:
# iflag=direct and if=/dev/zero combination does not work
# error: dd: failed to open '/dev/zero': Invalid argument
if (src == '/dev/zero' and flag == 'iflag=direct'):
return False
else:
utils.execute('dd', 'count=0', 'if=%s' % src,
'of=%s' % dest,
flag, run_as_root=True)
return True
except processutils.ProcessExecutionError:
return False
def _copy_volume_with_path(prefix, srcstr, deststr, size_in_m, blocksize,
sync=False, execute=utils.execute, ionice=None,
sparse=False):
cmd = prefix[:]
if ionice:
cmd.extend(('ionice', ionice))
blocksize = _check_blocksize(blocksize)
size_in_bytes = size_in_m * units.Mi
cmd.extend(('dd', 'if=%s' % srcstr, 'of=%s' % deststr,
'count=%d' % size_in_bytes, 'bs=%s' % blocksize))
# Use O_DIRECT to avoid thrashing the system buffer cache
odirect = check_for_odirect_support(srcstr, deststr, 'iflag=direct')
cmd.append('iflag=count_bytes,direct' if odirect else 'iflag=count_bytes')
if check_for_odirect_support(srcstr, deststr, 'oflag=direct'):
cmd.append('oflag=direct')
odirect = True
# If the volume is being unprovisioned then
# request the data is persisted before returning,
# so that it's not discarded from the cache.
conv = []
if sync and not odirect:
conv.append('fdatasync')
if sparse:
conv.append('sparse')
if conv:
conv_options = 'conv=' + ",".join(conv)
cmd.append(conv_options)
# Perform the copy
start_time = timeutils.utcnow()
execute(*cmd, run_as_root=True)
duration = timeutils.delta_seconds(start_time, timeutils.utcnow())
# NOTE(jdg): use a default of 1, mostly for unit test, but in
# some incredible event this is 0 (cirros image?) don't barf
if duration < 1:
duration = 1
mbps = (size_in_m / duration)
LOG.debug("Volume copy details: src %(src)s, dest %(dest)s, "
"size %(sz).2f MB, duration %(duration).2f sec",
{"src": srcstr,
"dest": deststr,
"sz": size_in_m,
"duration": duration})
LOG.info("Volume copy %(size_in_m).2f MB at %(mbps).2f MB/s",
{'size_in_m': size_in_m, 'mbps': mbps})
def _open_volume_with_path(path, mode):
try:
with utils.temporary_chown(path):
handle = open(path, mode)
return handle
except Exception:
LOG.error("Failed to open volume from %(path)s.", {'path': path})
def _transfer_data(src, dest, length, chunk_size):
"""Transfer data between files (Python IO objects)."""
chunks = int(math.ceil(length / chunk_size))
remaining_length = length
LOG.debug("%(chunks)s chunks of %(bytes)s bytes to be transferred.",
{'chunks': chunks, 'bytes': chunk_size})
for chunk in range(0, chunks):
before = time.time()
data = tpool.execute(src.read, min(chunk_size, remaining_length))
# If we have reached end of source, discard any extraneous bytes from
# destination volume if trim is enabled and stop writing.
if data == b'':
break
tpool.execute(dest.write, data)
remaining_length -= len(data)
delta = (time.time() - before)
rate = (chunk_size / delta) / units.Ki
LOG.debug("Transferred chunk %(chunk)s of %(chunks)s (%(rate)dK/s).",
{'chunk': chunk + 1, 'chunks': chunks, 'rate': rate})
# yield to any other pending operations
eventlet.sleep(0)
tpool.execute(dest.flush)
def _copy_volume_with_file(src, dest, size_in_m):
src_handle = src
if isinstance(src, six.string_types):
src_handle = _open_volume_with_path(src, 'rb')
dest_handle = dest
if isinstance(dest, six.string_types):
dest_handle = _open_volume_with_path(dest, 'wb')
if not src_handle:
raise exception.DeviceUnavailable(
_("Failed to copy volume, source device unavailable."))
if not dest_handle:
raise exception.DeviceUnavailable(
_("Failed to copy volume, destination device unavailable."))
start_time = timeutils.utcnow()
_transfer_data(src_handle, dest_handle, size_in_m * units.Mi, units.Mi * 4)
duration = max(1, timeutils.delta_seconds(start_time, timeutils.utcnow()))
if isinstance(src, six.string_types):
src_handle.close()
if isinstance(dest, six.string_types):
dest_handle.close()
mbps = (size_in_m / duration)
LOG.info("Volume copy completed (%(size_in_m).2f MB at "
"%(mbps).2f MB/s).",
{'size_in_m': size_in_m, 'mbps': mbps})
def copy_volume(src, dest, size_in_m, blocksize, sync=False,
execute=utils.execute, ionice=None, throttle=None,
sparse=False):
"""Copy data from the source volume to the destination volume.
The parameters 'src' and 'dest' are both typically of type str, which
represents the path to each volume on the filesystem. Connectors can
optionally return a volume handle of type RawIOBase for volumes that are
not available on the local filesystem for open/close operations.
If either 'src' or 'dest' are not of type str, then they are assumed to be
of type RawIOBase or any derivative that supports file operations such as
read and write. In this case, the handles are treated as file handles
instead of file paths and, at present moment, throttling is unavailable.
"""
if (isinstance(src, six.string_types) and
isinstance(dest, six.string_types)):
if not throttle:
throttle = throttling.Throttle.get_default()
with throttle.subcommand(src, dest) as throttle_cmd:
_copy_volume_with_path(throttle_cmd['prefix'], src, dest,
size_in_m, blocksize, sync=sync,
execute=execute, ionice=ionice,
sparse=sparse)
else:
_copy_volume_with_file(src, dest, size_in_m)
def clear_volume(volume_size, volume_path, volume_clear=None,
volume_clear_size=None, volume_clear_ionice=None,
throttle=None):
"""Unprovision old volumes to prevent data leaking between users."""
if volume_clear is None:
volume_clear = CONF.volume_clear
if volume_clear_size is None:
volume_clear_size = CONF.volume_clear_size
if volume_clear_size == 0:
volume_clear_size = volume_size
if volume_clear_ionice is None:
volume_clear_ionice = CONF.volume_clear_ionice
LOG.info("Performing secure delete on volume: %s", volume_path)
# We pass sparse=False explicitly here so that zero blocks are not
# skipped in order to clear the volume.
if volume_clear == 'zero':
return copy_volume('/dev/zero', volume_path, volume_clear_size,
CONF.volume_dd_blocksize,
sync=True, execute=utils.execute,
ionice=volume_clear_ionice,
throttle=throttle, sparse=False)
else:
raise exception.InvalidConfigurationValue(
option='volume_clear',
value=volume_clear)
def supports_thin_provisioning():
return brick_lvm.LVM.supports_thin_provisioning(
utils.get_root_helper())
def get_all_physical_volumes(vg_name=None):
return brick_lvm.LVM.get_all_physical_volumes(
utils.get_root_helper(),
vg_name)
def get_all_volume_groups(vg_name=None):
return brick_lvm.LVM.get_all_volume_groups(
utils.get_root_helper(),
vg_name)
# Default symbols to use for passwords. Avoids visually confusing characters.
# ~6 bits per symbol
DEFAULT_PASSWORD_SYMBOLS = ('23456789', # Removed: 0,1
'ABCDEFGHJKLMNPQRSTUVWXYZ', # Removed: I, O
'abcdefghijkmnopqrstuvwxyz') # Removed: l
def generate_password(length=16, symbolgroups=DEFAULT_PASSWORD_SYMBOLS):
"""Generate a random password from the supplied symbol groups.
At least one symbol from each group will be included. Unpredictable
results if length is less than the number of symbol groups.
Believed to be reasonably secure (with a reasonable password length!)
"""
# NOTE(jerdfelt): Some password policies require at least one character
# from each group of symbols, so start off with one random character
# from each symbol group
bytes = 1 # Number of random bytes to generate for each choice
password = [s[ord(urandom(bytes)) % len(s)]
for s in symbolgroups]
# If length < len(symbolgroups), the leading characters will only
# be from the first length groups. Try our best to not be predictable
# by shuffling and then truncating.
shuffle(password)
password = password[:length]
length -= len(password)
# then fill with random characters from all symbol groups
symbols = ''.join(symbolgroups)
password.extend(
[symbols[ord(urandom(bytes)) % len(symbols)]
for _i in range(length)])
# finally shuffle to ensure first x characters aren't from a
# predictable group
shuffle(password)
return ''.join(password)
def generate_username(length=20, symbolgroups=DEFAULT_PASSWORD_SYMBOLS):
# Use the same implementation as the password generation.
return generate_password(length, symbolgroups)
DEFAULT_POOL_NAME = '_pool0'
def extract_host(host, level='backend', default_pool_name=False):
"""Extract Host, Backend or Pool information from host string.
:param host: String for host, which could include host@backend#pool info
:param level: Indicate which level of information should be extracted
from host string. Level can be 'host', 'backend' or 'pool',
default value is 'backend'
:param default_pool_name: this flag specify what to do if level == 'pool'
and there is no 'pool' info encoded in host
string. default_pool_name=True will return
DEFAULT_POOL_NAME, otherwise we return None.
Default value of this parameter is False.
:return: expected information, string or None
:raises: exception.InvalidVolume
For example:
host = 'HostA@BackendB#PoolC'
ret = extract_host(host, 'host')
# ret is 'HostA'
ret = extract_host(host, 'backend')
# ret is 'HostA@BackendB'
ret = extract_host(host, 'pool')
# ret is 'PoolC'
host = 'HostX@BackendY'
ret = extract_host(host, 'pool')
# ret is None
ret = extract_host(host, 'pool', True)
# ret is '_pool0'
"""
if host is None:
msg = _("volume is not assigned to a host")
raise exception.InvalidVolume(reason=msg)
if level == 'host':
# make sure pool is not included
hst = host.split('#')[0]
return hst.split('@')[0]
elif level == 'backend':
return host.split('#')[0]
elif level == 'pool':
lst = host.split('#')
if len(lst) == 2:
return lst[1]
elif default_pool_name is True:
return DEFAULT_POOL_NAME
else:
return None
def append_host(host, pool):
"""Encode pool into host info."""
if not host or not pool:
return host
new_host = "#".join([host, pool])
return new_host
def matching_backend_name(src_volume_type, volume_type):
if src_volume_type.get('volume_backend_name') and \
volume_type.get('volume_backend_name'):
return src_volume_type.get('volume_backend_name') == \
volume_type.get('volume_backend_name')
else:
return False
def hosts_are_equivalent(host_1, host_2):
# In case host_1 or host_2 are None
if not (host_1 and host_2):
return host_1 == host_2
return extract_host(host_1) == extract_host(host_2)
def read_proc_mounts():
"""Read the /proc/mounts file.
It's a dummy function but it eases the writing of unit tests as mocking
__builtin__open() for a specific file only is not trivial.
"""
with open('/proc/mounts') as mounts:
return mounts.readlines()
def extract_id_from_volume_name(vol_name):
regex = re.compile(
CONF.volume_name_template.replace('%s', '(?P<uuid>.+)'))
match = regex.match(vol_name)
return match.group('uuid') if match else None
def check_already_managed_volume(vol_id):
"""Check cinder db for already managed volume.
:param vol_id: volume id parameter
:returns: bool -- return True, if db entry with specified
volume id exists, otherwise return False
"""
try:
return (vol_id and isinstance(vol_id, six.string_types) and
uuid.UUID(vol_id, version=4) and
objects.Volume.exists(context.get_admin_context(), vol_id))
except ValueError:
return False
def extract_id_from_snapshot_name(snap_name):
"""Return a snapshot's ID from its name on the backend."""
regex = re.compile(
CONF.snapshot_name_template.replace('%s', '(?P<uuid>.+)'))
match = regex.match(snap_name)
return match.group('uuid') if match else None
def paginate_entries_list(entries, marker, limit, offset, sort_keys,
sort_dirs):
"""Paginate a list of entries.
:param entries: list of dictionaries
:marker: The last element previously returned
:limit: The maximum number of items to return
:offset: The number of items to skip from the marker or from the first
element.
:sort_keys: A list of keys in the dictionaries to sort by
:sort_dirs: A list of sort directions, where each is either 'asc' or 'dec'
"""
comparers = [(operator.itemgetter(key.strip()), multiplier)
for (key, multiplier) in zip(sort_keys, sort_dirs)]
def comparer(left, right):
for fn, d in comparers:
left_val = fn(left)
right_val = fn(right)
if isinstance(left_val, dict):
left_val = sorted(left_val.values())[0]
if isinstance(right_val, dict):
right_val = sorted(right_val.values())[0]
if left_val == right_val:
continue
if d == 'asc':
return -1 if left_val < right_val else 1
else:
return -1 if left_val > right_val else 1
else:
return 0
sorted_entries = sorted(entries, key=functools.cmp_to_key(comparer))
start_index = 0
if offset is None:
offset = 0
if marker:
if not isinstance(marker, dict):
try:
marker = json.loads(marker)
except ValueError:
msg = _('marker %s can not be analysed, please use json like '
'format') % marker
raise exception.InvalidInput(reason=msg)
start_index = -1
for i, entry in enumerate(sorted_entries):
if entry['reference'] == marker:
start_index = i + 1
break
if start_index < 0:
msg = _('marker not found: %s') % marker
raise exception.InvalidInput(reason=msg)
range_end = start_index + limit
return sorted_entries[start_index + offset:range_end + offset]
def convert_config_string_to_dict(config_string):
"""Convert config file replication string to a dict.
The only supported form is as follows:
"{'key-1'='val-1' 'key-2'='val-2'...}"
:param config_string: Properly formatted string to convert to dict.
:response: dict of string values
"""
resultant_dict = {}
try:
st = config_string.replace("=", ":")
st = st.replace(" ", ", ")
resultant_dict = ast.literal_eval(st)
except Exception:
LOG.warning("Error encountered translating config_string: "
"%(config_string)s to dict",
{'config_string': config_string})
return resultant_dict
def create_encryption_key(context, key_manager, volume_type_id):
encryption_key_id = None
if volume_types.is_encrypted(context, volume_type_id):
volume_type_encryption = (
volume_types.get_volume_type_encryption(context,
volume_type_id))
cipher = volume_type_encryption.cipher
length = volume_type_encryption.key_size
algorithm = cipher.split('-')[0] if cipher else None
encryption_key_id = key_manager.create_key(
context,
algorithm=algorithm,
length=length)
return encryption_key_id
def is_replicated_str(str):
spec = (str or '').split()
return (len(spec) == 2 and
spec[0] == '<is>' and strutils.bool_from_string(spec[1]))
def is_replicated_spec(extra_specs):
return (extra_specs and
is_replicated_str(extra_specs.get('replication_enabled')))
def group_get_by_id(group_id):
ctxt = context.get_admin_context()
group = db.group_get(ctxt, group_id)
return group
def is_group_a_cg_snapshot_type(group_or_snap):
LOG.debug("Checking if %s is a consistent snapshot group",
group_or_snap)
if group_or_snap["group_type_id"] is not None:
spec = group_types.get_group_type_specs(
group_or_snap["group_type_id"],
key="consistent_group_snapshot_enabled"
)
return spec == "<is> True"
return False
def is_group_a_type(group, key):
if group.group_type_id is not None:
spec = group_types.get_group_type_specs(
group.group_type_id, key=key
)
return spec == "<is> True"
return False
def is_group_a_non_consistent_replication_group_type(group):
return is_group_a_type(group, "group_replication_enabled")
def is_group_a_consistent_replication_group_type(group):
return is_group_a_type(group, "consistent_group_replication_enabled")
def is_group_a_replication_group_type(group):
if (is_group_a_non_consistent_replication_group_type(group) or
is_group_a_consistent_replication_group_type(group)):
return True
return False
def get_replication_groups_by_host(ctxt, host):
groups = []
filters = {'host': host, 'backend_match_level': 'backend'}
grps = objects.GroupList.get_all(ctxt, filters=filters)
for grp in grps:
if is_group_a_replication_group_type(grp):
groups.append(grp)
return groups
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