/
utils.py
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/
utils.py
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# Copyright (c) 2011 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.
"""Compute-related Utilities and helpers."""
import contextlib
import functools
import inspect
import itertools
import math
import string
import traceback
import netifaces
from oslo_log import log
from oslo_serialization import jsonutils
import six
from nova import block_device
from nova.compute import power_state
from nova.compute import task_states
from nova.compute import vm_states
import nova.conf
from nova import exception
from nova import notifications
from nova.notifications.objects import aggregate as aggregate_notification
from nova.notifications.objects import base as notification_base
from nova.notifications.objects import exception as notification_exception
from nova.notifications.objects import flavor as flavor_notification
from nova.notifications.objects import instance as instance_notification
from nova.notifications.objects import keypair as keypair_notification
from nova.notifications.objects import libvirt as libvirt_notification
from nova.notifications.objects import metrics as metrics_notification
from nova.notifications.objects import server_group as sg_notification
from nova import objects
from nova.objects import fields
from nova import rpc
from nova import safe_utils
from nova import utils
from nova.virt import driver
CONF = nova.conf.CONF
LOG = log.getLogger(__name__)
def exception_to_dict(fault, message=None):
"""Converts exceptions to a dict for use in notifications."""
# TODO(johngarbutt) move to nova/exception.py to share with wrap_exception
code = 500
if hasattr(fault, "kwargs"):
code = fault.kwargs.get('code', 500)
# get the message from the exception that was thrown
# if that does not exist, use the name of the exception class itself
try:
if not message:
message = fault.format_message()
# These exception handlers are broad so we don't fail to log the fault
# just because there is an unexpected error retrieving the message
except Exception:
try:
message = six.text_type(fault)
except Exception:
message = None
if not message:
message = fault.__class__.__name__
# NOTE(dripton) The message field in the database is limited to 255 chars.
# MySQL silently truncates overly long messages, but PostgreSQL throws an
# error if we don't truncate it.
u_message = utils.safe_truncate(message, 255)
fault_dict = dict(exception=fault)
fault_dict["message"] = u_message
fault_dict["code"] = code
return fault_dict
def _get_fault_details(exc_info, error_code):
details = ''
if exc_info and error_code == 500:
tb = exc_info[2]
if tb:
details = ''.join(traceback.format_tb(tb))
return six.text_type(details)
def add_instance_fault_from_exc(context, instance, fault, exc_info=None,
fault_message=None):
"""Adds the specified fault to the database."""
fault_obj = objects.InstanceFault(context=context)
fault_obj.host = CONF.host
fault_obj.instance_uuid = instance.uuid
fault_obj.update(exception_to_dict(fault, message=fault_message))
code = fault_obj.code
fault_obj.details = _get_fault_details(exc_info, code)
fault_obj.create()
def get_device_name_for_instance(instance, bdms, device):
"""Validates (or generates) a device name for instance.
This method is a wrapper for get_next_device_name that gets the list
of used devices and the root device from a block device mapping.
"""
mappings = block_device.instance_block_mapping(instance, bdms)
return get_next_device_name(instance, mappings.values(),
mappings['root'], device)
def default_device_names_for_instance(instance, root_device_name,
*block_device_lists):
"""Generate missing device names for an instance."""
dev_list = [bdm.device_name
for bdm in itertools.chain(*block_device_lists)
if bdm.device_name]
if root_device_name not in dev_list:
dev_list.append(root_device_name)
for bdm in itertools.chain(*block_device_lists):
dev = bdm.device_name
if not dev:
dev = get_next_device_name(instance, dev_list,
root_device_name)
bdm.device_name = dev
bdm.save()
dev_list.append(dev)
def get_next_device_name(instance, device_name_list,
root_device_name=None, device=None):
"""Validates (or generates) a device name for instance.
If device is not set, it will generate a unique device appropriate
for the instance. It uses the root_device_name (if provided) and
the list of used devices to find valid device names. If the device
name is valid but applicable to a different backend (for example
/dev/vdc is specified but the backend uses /dev/xvdc), the device
name will be converted to the appropriate format.
"""
req_prefix = None
req_letter = None
if device:
try:
req_prefix, req_letter = block_device.match_device(device)
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=device)
if not root_device_name:
root_device_name = block_device.DEFAULT_ROOT_DEV_NAME
try:
prefix = block_device.match_device(
block_device.prepend_dev(root_device_name))[0]
except (TypeError, AttributeError, ValueError):
raise exception.InvalidDevicePath(path=root_device_name)
# NOTE(vish): remove this when xenapi is setting default_root_device
if driver.is_xenapi():
prefix = '/dev/xvd'
if req_prefix != prefix:
LOG.debug("Using %(prefix)s instead of %(req_prefix)s",
{'prefix': prefix, 'req_prefix': req_prefix})
used_letters = set()
for device_path in device_name_list:
letter = block_device.get_device_letter(device_path)
used_letters.add(letter)
# NOTE(vish): remove this when xenapi is properly setting
# default_ephemeral_device and default_swap_device
if driver.is_xenapi():
flavor = instance.get_flavor()
if flavor.ephemeral_gb:
used_letters.add('b')
if flavor.swap:
used_letters.add('c')
if not req_letter:
req_letter = _get_unused_letter(used_letters)
if req_letter in used_letters:
raise exception.DevicePathInUse(path=device)
return prefix + req_letter
def get_root_bdm(context, instance, bdms=None):
if bdms is None:
if isinstance(instance, objects.Instance):
uuid = instance.uuid
else:
uuid = instance['uuid']
bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
context, uuid)
return bdms.root_bdm()
def is_volume_backed_instance(context, instance, bdms=None):
root_bdm = get_root_bdm(context, instance, bdms)
if root_bdm is not None:
return root_bdm.is_volume
# in case we hit a very old instance without root bdm, we _assume_ that
# instance is backed by a volume, if and only if image_ref is not set
if isinstance(instance, objects.Instance):
return not instance.image_ref
return not instance['image_ref']
def heal_reqspec_is_bfv(ctxt, request_spec, instance):
"""Calculates the is_bfv flag for a RequestSpec created before Rocky.
Starting in Rocky, new instances have their RequestSpec created with
the "is_bfv" flag to indicate if they are volume-backed which is used
by the scheduler when determining root disk resource allocations.
RequestSpecs created before Rocky will not have the is_bfv flag set
so we need to calculate it here and update the RequestSpec.
:param ctxt: nova.context.RequestContext auth context
:param request_spec: nova.objects.RequestSpec used for scheduling
:param instance: nova.objects.Instance being scheduled
"""
if 'is_bfv' in request_spec:
return
# Determine if this is a volume-backed instance and set the field
# in the request spec accordingly.
request_spec.is_bfv = is_volume_backed_instance(ctxt, instance)
request_spec.save()
def convert_mb_to_ceil_gb(mb_value):
gb_int = 0
if mb_value:
gb_float = mb_value / 1024.0
# ensure we reserve/allocate enough space by rounding up to nearest GB
gb_int = int(math.ceil(gb_float))
return gb_int
def _get_unused_letter(used_letters):
doubles = [first + second for second in string.ascii_lowercase
for first in string.ascii_lowercase]
all_letters = set(list(string.ascii_lowercase) + doubles)
letters = list(all_letters - used_letters)
# NOTE(vish): prepend ` so all shorter sequences sort first
letters.sort(key=lambda x: x.rjust(2, '`'))
return letters[0]
def get_value_from_system_metadata(instance, key, type, default):
"""Get a value of a specified type from image metadata.
@param instance: The instance object
@param key: The name of the property to get
@param type: The python type the value is be returned as
@param default: The value to return if key is not set or not the right type
"""
value = instance.system_metadata.get(key, default)
try:
return type(value)
except ValueError:
LOG.warning("Metadata value %(value)s for %(key)s is not of "
"type %(type)s. Using default value %(default)s.",
{'value': value, 'key': key, 'type': type,
'default': default}, instance=instance)
return default
def notify_usage_exists(notifier, context, instance_ref, host,
current_period=False, ignore_missing_network_data=True,
system_metadata=None, extra_usage_info=None):
"""Generates 'exists' unversioned legacy and transformed notification
for an instance for usage auditing purposes.
:param notifier: a messaging.Notifier
:param context: request context for the current operation
:param instance_ref: nova.objects.Instance object from which to report
usage
:param host: the host emitting the notification
:param current_period: if True, this will generate a usage for the
current usage period; if False, this will generate a usage for the
previous audit period.
:param ignore_missing_network_data: if True, log any exceptions generated
while getting network info; if False, raise the exception.
:param system_metadata: system_metadata override for the instance. If
None, the instance_ref.system_metadata will be used.
:param extra_usage_info: Dictionary containing extra values to add or
override in the notification if not None.
"""
audit_start, audit_end = notifications.audit_period_bounds(current_period)
bw = notifications.bandwidth_usage(context, instance_ref, audit_start,
ignore_missing_network_data)
if system_metadata is None:
system_metadata = utils.instance_sys_meta(instance_ref)
# add image metadata to the notification:
image_meta = notifications.image_meta(system_metadata)
extra_info = dict(audit_period_beginning=str(audit_start),
audit_period_ending=str(audit_end),
bandwidth=bw, image_meta=image_meta)
if extra_usage_info:
extra_info.update(extra_usage_info)
notify_about_instance_usage(notifier, context, instance_ref, 'exists',
extra_usage_info=extra_info)
audit_period = instance_notification.AuditPeriodPayload(
audit_period_beginning=audit_start,
audit_period_ending=audit_end)
bandwidth = [instance_notification.BandwidthPayload(
network_name=label,
in_bytes=b['bw_in'],
out_bytes=b['bw_out'])
for label, b in bw.items()]
payload = instance_notification.InstanceExistsPayload(
context=context,
instance=instance_ref,
audit_period=audit_period,
bandwidth=bandwidth)
notification = instance_notification.InstanceExistsNotification(
context=context,
priority=fields.NotificationPriority.INFO,
publisher=notification_base.NotificationPublisher(
host=host, source=fields.NotificationSource.COMPUTE),
event_type=notification_base.EventType(
object='instance',
action=fields.NotificationAction.EXISTS),
payload=payload)
notification.emit(context)
def notify_about_instance_usage(notifier, context, instance, event_suffix,
network_info=None, extra_usage_info=None,
fault=None):
"""Send an unversioned legacy notification about an instance.
All new notifications should use notify_about_instance_action which sends
a versioned notification.
:param notifier: a messaging.Notifier
:param event_suffix: Event type like "delete.start" or "exists"
:param network_info: Networking information, if provided.
:param extra_usage_info: Dictionary containing extra values to add or
override in the notification.
"""
if not extra_usage_info:
extra_usage_info = {}
usage_info = notifications.info_from_instance(context, instance,
network_info, populate_image_ref_url=True, **extra_usage_info)
if fault:
# NOTE(johngarbutt) mirrors the format in wrap_exception
fault_payload = exception_to_dict(fault)
LOG.debug(fault_payload["message"], instance=instance)
usage_info.update(fault_payload)
if event_suffix.endswith("error"):
method = notifier.error
else:
method = notifier.info
method(context, 'compute.instance.%s' % event_suffix, usage_info)
def _get_fault_and_priority_from_exc_and_tb(exception, tb):
fault = None
priority = fields.NotificationPriority.INFO
if exception:
priority = fields.NotificationPriority.ERROR
fault = notification_exception.ExceptionPayload.from_exc_and_traceback(
exception, tb)
return fault, priority
@rpc.if_notifications_enabled
def notify_about_instance_action(context, instance, host, action, phase=None,
source=fields.NotificationSource.COMPUTE,
exception=None, bdms=None, tb=None):
"""Send versioned notification about the action made on the instance
:param instance: the instance which the action performed on
:param host: the host emitting the notification
:param action: the name of the action
:param phase: the phase of the action
:param source: the source of the notification
:param exception: the thrown exception (used in error notifications)
:param bdms: BlockDeviceMappingList object for the instance. If it is not
provided then we will load it from the db if so configured
:param tb: the traceback (used in error notifications)
"""
fault, priority = _get_fault_and_priority_from_exc_and_tb(exception, tb)
payload = instance_notification.InstanceActionPayload(
context=context,
instance=instance,
fault=fault,
bdms=bdms)
notification = instance_notification.InstanceActionNotification(
context=context,
priority=priority,
publisher=notification_base.NotificationPublisher(
host=host, source=source),
event_type=notification_base.EventType(
object='instance',
action=action,
phase=phase),
payload=payload)
notification.emit(context)
@rpc.if_notifications_enabled
def notify_about_instance_create(context, instance, host, phase=None,
exception=None, bdms=None, tb=None):
"""Send versioned notification about instance creation
:param context: the request context
:param instance: the instance being created
:param host: the host emitting the notification
:param phase: the phase of the creation
:param exception: the thrown exception (used in error notifications)
:param bdms: BlockDeviceMappingList object for the instance. If it is not
provided then we will load it from the db if so configured
:param tb: the traceback (used in error notifications)
"""
fault, priority = _get_fault_and_priority_from_exc_and_tb(exception, tb)
payload = instance_notification.InstanceCreatePayload(
context=context,
instance=instance,
fault=fault,
bdms=bdms)
notification = instance_notification.InstanceCreateNotification(
context=context,
priority=priority,
publisher=notification_base.NotificationPublisher(
host=host, source=fields.NotificationSource.COMPUTE),
event_type=notification_base.EventType(
object='instance',
action=fields.NotificationAction.CREATE,
phase=phase),
payload=payload)
notification.emit(context)
@rpc.if_notifications_enabled
def notify_about_volume_attach_detach(context, instance, host, action, phase,
volume_id=None, exception=None, tb=None):
"""Send versioned notification about the action made on the instance
:param instance: the instance which the action performed on
:param host: the host emitting the notification
:param action: the name of the action
:param phase: the phase of the action
:param volume_id: id of the volume will be attached
:param exception: the thrown exception (used in error notifications)
:param tb: the traceback (used in error notifications)
"""
fault, priority = _get_fault_and_priority_from_exc_and_tb(exception, tb)
payload = instance_notification.InstanceActionVolumePayload(
context=context,
instance=instance,
fault=fault,
volume_id=volume_id)
notification = instance_notification.InstanceActionVolumeNotification(
context=context,
priority=priority,
publisher=notification_base.NotificationPublisher(
host=host, source=fields.NotificationSource.COMPUTE),
event_type=notification_base.EventType(
object='instance',
action=action,
phase=phase),
payload=payload)
notification.emit(context)
@rpc.if_notifications_enabled
def notify_about_instance_rescue_action(context, instance, host,
rescue_image_ref, phase=None,
exception=None, tb=None):
"""Send versioned notification about the action made on the instance
:param instance: the instance which the action performed on
:param host: the host emitting the notification
:param rescue_image_ref: the rescue image ref
:param phase: the phase of the action
:param exception: the thrown exception (used in error notifications)
:param tb: the traceback (used in error notifications)
"""
fault, priority = _get_fault_and_priority_from_exc_and_tb(exception, tb)
payload = instance_notification.InstanceActionRescuePayload(
context=context,
instance=instance,
fault=fault,
rescue_image_ref=rescue_image_ref)
notification = instance_notification.InstanceActionRescueNotification(
context=context,
priority=priority,
publisher=notification_base.NotificationPublisher(
host=host, source=fields.NotificationSource.COMPUTE),
event_type=notification_base.EventType(
object='instance',
action=fields.NotificationAction.RESCUE,
phase=phase),
payload=payload)
notification.emit(context)
@rpc.if_notifications_enabled
def notify_about_keypair_action(context, keypair, action, phase):
"""Send versioned notification about the keypair action on the instance
:param context: the request context
:param keypair: the keypair which the action performed on
:param action: the name of the action
:param phase: the phase of the action
"""
payload = keypair_notification.KeypairPayload(keypair=keypair)
notification = keypair_notification.KeypairNotification(
priority=fields.NotificationPriority.INFO,
publisher=notification_base.NotificationPublisher(
host=CONF.host, source=fields.NotificationSource.API),
event_type=notification_base.EventType(
object='keypair',
action=action,
phase=phase),
payload=payload)
notification.emit(context)
@rpc.if_notifications_enabled
def notify_about_volume_swap(context, instance, host, phase,
old_volume_id, new_volume_id, exception=None,
tb=None):
"""Send versioned notification about the volume swap action
on the instance
:param context: the request context
:param instance: the instance which the action performed on
:param host: the host emitting the notification
:param phase: the phase of the action
:param old_volume_id: the ID of the volume that is copied from and detached
:param new_volume_id: the ID of the volume that is copied to and attached
:param exception: an exception
:param tb: the traceback (used in error notifications)
"""
fault, priority = _get_fault_and_priority_from_exc_and_tb(exception, tb)
payload = instance_notification.InstanceActionVolumeSwapPayload(
context=context,
instance=instance,
fault=fault,
old_volume_id=old_volume_id,
new_volume_id=new_volume_id)
instance_notification.InstanceActionVolumeSwapNotification(
context=context,
priority=priority,
publisher=notification_base.NotificationPublisher(
host=host, source=fields.NotificationSource.COMPUTE),
event_type=notification_base.EventType(
object='instance',
action=fields.NotificationAction.VOLUME_SWAP,
phase=phase),
payload=payload).emit(context)
@rpc.if_notifications_enabled
def notify_about_instance_snapshot(context, instance, host, phase,
snapshot_image_id):
"""Send versioned notification about the snapshot action executed on the
instance
:param context: the request context
:param instance: the instance from which a snapshot image is being created
:param host: the host emitting the notification
:param phase: the phase of the action
:param snapshot_image_id: the ID of the snapshot
"""
payload = instance_notification.InstanceActionSnapshotPayload(
context=context,
instance=instance,
fault=None,
snapshot_image_id=snapshot_image_id)
instance_notification.InstanceActionSnapshotNotification(
context=context,
priority=fields.NotificationPriority.INFO,
publisher=notification_base.NotificationPublisher(
host=host, source=fields.NotificationSource.COMPUTE),
event_type=notification_base.EventType(
object='instance',
action=fields.NotificationAction.SNAPSHOT,
phase=phase),
payload=payload).emit(context)
@rpc.if_notifications_enabled
def notify_about_resize_prep_instance(context, instance, host, phase,
new_flavor):
"""Send versioned notification about the instance resize action
on the instance
:param context: the request context
:param instance: the instance which the resize action performed on
:param host: the host emitting the notification
:param phase: the phase of the action
:param new_flavor: new flavor
"""
payload = instance_notification.InstanceActionResizePrepPayload(
context=context,
instance=instance,
fault=None,
new_flavor=flavor_notification.FlavorPayload(flavor=new_flavor))
instance_notification.InstanceActionResizePrepNotification(
context=context,
priority=fields.NotificationPriority.INFO,
publisher=notification_base.NotificationPublisher(
host=host, source=fields.NotificationSource.COMPUTE),
event_type=notification_base.EventType(
object='instance',
action=fields.NotificationAction.RESIZE_PREP,
phase=phase),
payload=payload).emit(context)
def notify_about_server_group_update(context, event_suffix, sg_payload):
"""Send a notification about server group update.
:param event_suffix: Event type like "create.start" or "create.end"
:param sg_payload: payload for server group update
"""
notifier = rpc.get_notifier(service='servergroup')
notifier.info(context, 'servergroup.%s' % event_suffix, sg_payload)
def notify_about_aggregate_update(context, event_suffix, aggregate_payload):
"""Send a notification about aggregate update.
:param event_suffix: Event type like "create.start" or "create.end"
:param aggregate_payload: payload for aggregate update
"""
aggregate_identifier = aggregate_payload.get('aggregate_id', None)
if not aggregate_identifier:
aggregate_identifier = aggregate_payload.get('name', None)
if not aggregate_identifier:
LOG.debug("No aggregate id or name specified for this "
"notification and it will be ignored")
return
notifier = rpc.get_notifier(service='aggregate',
host=aggregate_identifier)
notifier.info(context, 'aggregate.%s' % event_suffix, aggregate_payload)
@rpc.if_notifications_enabled
def notify_about_aggregate_action(context, aggregate, action, phase):
payload = aggregate_notification.AggregatePayload(aggregate)
notification = aggregate_notification.AggregateNotification(
priority=fields.NotificationPriority.INFO,
publisher=notification_base.NotificationPublisher(
host=CONF.host, source=fields.NotificationSource.API),
event_type=notification_base.EventType(
object='aggregate',
action=action,
phase=phase),
payload=payload)
notification.emit(context)
def notify_about_host_update(context, event_suffix, host_payload):
"""Send a notification about host update.
:param event_suffix: Event type like "create.start" or "create.end"
:param host_payload: payload for host update. It is a dict and there
should be at least the 'host_name' key in this
dict.
"""
host_identifier = host_payload.get('host_name')
if not host_identifier:
LOG.warning("No host name specified for the notification of "
"HostAPI.%s and it will be ignored", event_suffix)
return
notifier = rpc.get_notifier(service='api', host=host_identifier)
notifier.info(context, 'HostAPI.%s' % event_suffix, host_payload)
@rpc.if_notifications_enabled
def notify_about_server_group_action(context, group, action):
payload = sg_notification.ServerGroupPayload(group)
notification = sg_notification.ServerGroupNotification(
priority=fields.NotificationPriority.INFO,
publisher=notification_base.NotificationPublisher(
host=CONF.host, source=fields.NotificationSource.API),
event_type=notification_base.EventType(
object='server_group',
action=action),
payload=payload)
notification.emit(context)
@rpc.if_notifications_enabled
def notify_about_server_group_add_member(context, group_id):
group = objects.InstanceGroup.get_by_uuid(context, group_id)
payload = sg_notification.ServerGroupPayload(group)
notification = sg_notification.ServerGroupNotification(
priority=fields.NotificationPriority.INFO,
publisher=notification_base.NotificationPublisher(
host=CONF.host, source=fields.NotificationSource.API),
event_type=notification_base.EventType(
object='server_group',
action=fields.NotificationAction.ADD_MEMBER),
payload=payload)
notification.emit(context)
@rpc.if_notifications_enabled
def notify_about_instance_rebuild(context, instance, host,
action=fields.NotificationAction.REBUILD,
phase=None,
source=fields.NotificationSource.COMPUTE,
exception=None, bdms=None, tb=None):
"""Send versioned notification about instance rebuild
:param instance: the instance which the action performed on
:param host: the host emitting the notification
:param action: the name of the action
:param phase: the phase of the action
:param source: the source of the notification
:param exception: the thrown exception (used in error notifications)
:param bdms: BlockDeviceMappingList object for the instance. If it is not
provided then we will load it from the db if so configured
:param tb: the traceback (used in error notifications)
"""
fault, priority = _get_fault_and_priority_from_exc_and_tb(exception, tb)
payload = instance_notification.InstanceActionRebuildPayload(
context=context,
instance=instance,
fault=fault,
bdms=bdms)
notification = instance_notification.InstanceActionRebuildNotification(
context=context,
priority=priority,
publisher=notification_base.NotificationPublisher(
host=host, source=source),
event_type=notification_base.EventType(
object='instance',
action=action,
phase=phase),
payload=payload)
notification.emit(context)
@rpc.if_notifications_enabled
def notify_about_metrics_update(context, host, host_ip, nodename,
monitor_metric_list):
"""Send versioned notification about updating metrics
:param context: the request context
:param host: the host emitting the notification
:param host_ip: the IP address of the host
:param nodename: the node name
:param monitor_metric_list: the MonitorMetricList object
"""
payload = metrics_notification.MetricsPayload(
host=host,
host_ip=host_ip,
nodename=nodename,
monitor_metric_list=monitor_metric_list)
notification = metrics_notification.MetricsNotification(
context=context,
priority=fields.NotificationPriority.INFO,
publisher=notification_base.NotificationPublisher(
host=host, source=fields.NotificationSource.COMPUTE),
event_type=notification_base.EventType(
object='metrics',
action=fields.NotificationAction.UPDATE),
payload=payload)
notification.emit(context)
@rpc.if_notifications_enabled
def notify_about_libvirt_connect_error(context, ip, exception, tb):
"""Send a versioned notification about libvirt connect error.
:param context: the request context
:param ip: the IP address of the host
:param exception: the thrown exception
:param tb: the traceback
"""
fault, _ = _get_fault_and_priority_from_exc_and_tb(exception, tb)
payload = libvirt_notification.LibvirtErrorPayload(ip=ip, reason=fault)
notification = libvirt_notification.LibvirtErrorNotification(
priority=fields.NotificationPriority.ERROR,
publisher=notification_base.NotificationPublisher(
host=CONF.host, source=fields.NotificationSource.COMPUTE),
event_type=notification_base.EventType(
object='libvirt',
action=fields.NotificationAction.CONNECT,
phase=fields.NotificationPhase.ERROR),
payload=payload)
notification.emit(context)
def refresh_info_cache_for_instance(context, instance):
"""Refresh the info cache for an instance.
:param instance: The instance object.
"""
if instance.info_cache is not None and not instance.deleted:
# Catch the exception in case the instance got deleted after the check
# instance.deleted was executed
try:
instance.info_cache.refresh()
except exception.InstanceInfoCacheNotFound:
LOG.debug("Can not refresh info_cache because instance "
"was not found", instance=instance)
def usage_volume_info(vol_usage):
def null_safe_str(s):
return str(s) if s else ''
tot_refreshed = vol_usage.tot_last_refreshed
curr_refreshed = vol_usage.curr_last_refreshed
if tot_refreshed and curr_refreshed:
last_refreshed_time = max(tot_refreshed, curr_refreshed)
elif tot_refreshed:
last_refreshed_time = tot_refreshed
else:
# curr_refreshed must be set
last_refreshed_time = curr_refreshed
usage_info = dict(
volume_id=vol_usage.volume_id,
tenant_id=vol_usage.project_id,
user_id=vol_usage.user_id,
availability_zone=vol_usage.availability_zone,
instance_id=vol_usage.instance_uuid,
last_refreshed=null_safe_str(last_refreshed_time),
reads=vol_usage.tot_reads + vol_usage.curr_reads,
read_bytes=vol_usage.tot_read_bytes +
vol_usage.curr_read_bytes,
writes=vol_usage.tot_writes + vol_usage.curr_writes,
write_bytes=vol_usage.tot_write_bytes +
vol_usage.curr_write_bytes)
return usage_info
def get_reboot_type(task_state, current_power_state):
"""Checks if the current instance state requires a HARD reboot."""
if current_power_state != power_state.RUNNING:
return 'HARD'
if task_state in task_states.soft_reboot_states:
return 'SOFT'
return 'HARD'
def get_machine_ips():
"""Get the machine's ip addresses
:returns: list of Strings of ip addresses
"""
addresses = []
for interface in netifaces.interfaces():
try:
iface_data = netifaces.ifaddresses(interface)
for family in iface_data:
if family not in (netifaces.AF_INET, netifaces.AF_INET6):
continue
for address in iface_data[family]:
addr = address['addr']
# If we have an ipv6 address remove the
# %ether_interface at the end
if family == netifaces.AF_INET6:
addr = addr.split('%')[0]
addresses.append(addr)
except ValueError:
pass
return addresses
def upsize_quota_delta(new_flavor, old_flavor):
"""Calculate deltas required to adjust quota for an instance upsize.
:param new_flavor: the target instance type
:param old_flavor: the original instance type
"""
def _quota_delta(resource):
return (new_flavor[resource] - old_flavor[resource])
deltas = {}
if _quota_delta('vcpus') > 0:
deltas['cores'] = _quota_delta('vcpus')
if _quota_delta('memory_mb') > 0:
deltas['ram'] = _quota_delta('memory_mb')
return deltas
def get_headroom(quotas, usages, deltas):
headroom = {res: quotas[res] - usages[res]
for res in quotas.keys()}
# If quota_cores is unlimited [-1]:
# - set cores headroom based on instances headroom:
if quotas.get('cores') == -1:
if deltas.get('cores'):
hc = headroom.get('instances', 1) * deltas['cores']
headroom['cores'] = hc / deltas.get('instances', 1)
else:
headroom['cores'] = headroom.get('instances', 1)
# If quota_ram is unlimited [-1]:
# - set ram headroom based on instances headroom:
if quotas.get('ram') == -1:
if deltas.get('ram'):
hr = headroom.get('instances', 1) * deltas['ram']
headroom['ram'] = hr / deltas.get('instances', 1)
else:
headroom['ram'] = headroom.get('instances', 1)
return headroom
def check_num_instances_quota(context, instance_type, min_count,
max_count, project_id=None, user_id=None,
orig_num_req=None):
"""Enforce quota limits on number of instances created."""
# project_id is used for the TooManyInstances error message
if project_id is None:
project_id = context.project_id
# Determine requested cores and ram
req_cores = max_count * instance_type.vcpus
req_ram = max_count * instance_type.memory_mb
deltas = {'instances': max_count, 'cores': req_cores, 'ram': req_ram}
try:
objects.Quotas.check_deltas(context, deltas,
project_id, user_id=user_id,
check_project_id=project_id,
check_user_id=user_id)
except exception.OverQuota as exc:
quotas = exc.kwargs['quotas']
overs = exc.kwargs['overs']
usages = exc.kwargs['usages']
# This is for the recheck quota case where we used a delta of zero.
if min_count == max_count == 0:
# orig_num_req is the original number of instances requested in the
# case of a recheck quota, for use in the over quota exception.
req_cores = orig_num_req * instance_type.vcpus
req_ram = orig_num_req * instance_type.memory_mb
requested = {'instances': orig_num_req, 'cores': req_cores,
'ram': req_ram}
(overs, reqs, total_alloweds, useds) = get_over_quota_detail(
deltas, overs, quotas, requested)
msg = "Cannot run any more instances of this type."
params = {'overs': overs, 'pid': project_id, 'msg': msg}
LOG.debug("%(overs)s quota exceeded for %(pid)s. %(msg)s",
params)
raise exception.TooManyInstances(overs=overs,
req=reqs,
used=useds,
allowed=total_alloweds)
# OK, we exceeded quota; let's figure out why...
headroom = get_headroom(quotas, usages, deltas)