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# Copyright 2022 StackHPC
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import typing as ty
import os_resource_classes as orc
from oslo_limit import exception as limit_exceptions
from oslo_limit import limit
from oslo_log import log as logging
import nova.conf
from nova import exception
from nova.limit import utils as limit_utils
from nova import objects
from nova import quota
from nova.scheduler.client import report
from nova.scheduler import utils
LOG = logging.getLogger(__name__)
CONF = nova.conf.CONF
# Cache to avoid repopulating ksa state
PLACEMENT_CLIENT = None
LEGACY_LIMITS = {
"servers": "instances",
"class:VCPU": "cores",
"class:MEMORY_MB": "ram",
}
def _get_placement_usages(
context: 'nova.context.RequestContext', project_id: str
) -> ty.Dict[str, int]:
return report.report_client_singleton().get_usages_counts_for_limits(
context, project_id)
def _get_usage(
context: 'nova.context.RequestContext',
project_id: str,
resource_names: ty.List[str],
) -> ty.Dict[str, int]:
"""Called by oslo_limit's enforcer"""
if not limit_utils.use_unified_limits():
raise NotImplementedError("Unified limits support is disabled")
count_servers = False
resource_classes = []
for resource in resource_names:
if resource == "servers":
count_servers = True
continue
if not resource.startswith("class:"):
raise ValueError("Unknown resource type: %s" % resource)
# Temporarily strip resource class prefix as placement does not use it.
# Example: limit resource 'class:VCPU' will be returned as 'VCPU' from
# placement.
r_class = resource.lstrip("class:")
if r_class in orc.STANDARDS or orc.is_custom(r_class):
resource_classes.append(r_class)
else:
raise ValueError("Unknown resource class: %s" % r_class)
if not count_servers and len(resource_classes) == 0:
raise ValueError("no resources to check")
resource_counts = {}
if count_servers:
# TODO(melwitt): Change this to count servers from placement once nova
# is using placement consumer types and is able to differentiate
# between "instance" allocations vs "migration" allocations.
if not quota.is_qfd_populated(context):
LOG.error('Must migrate all instance mappings before using '
'unified limits')
raise ValueError("must first migrate instance mappings")
mappings = objects.InstanceMappingList.get_counts(context, project_id)
resource_counts['servers'] = mappings['project']['instances']
try:
usages = _get_placement_usages(context, project_id)
except exception.UsagesRetrievalFailed as e:
msg = ("Failed to retrieve usages from placement while enforcing "
"%s quota limits." % ", ".join(resource_names))
LOG.error(msg + " Error: " + str(e))
raise exception.UsagesRetrievalFailed(msg)
# Use legacy behavior VCPU = VCPU + PCPU if configured.
if CONF.workarounds.unified_limits_count_pcpu_as_vcpu:
# If PCPU is in resource_classes, that means it was specified in the
# flavor explicitly. In that case, we expect it to have its own limit
# registered and we should not fold it into VCPU.
if orc.PCPU in usages and orc.PCPU not in resource_classes:
usages[orc.VCPU] = (usages.get(orc.VCPU, 0) +
usages.get(orc.PCPU, 0))
for resource_class in resource_classes:
# Need to add back resource class prefix that was stripped earlier
resource_name = 'class:' + resource_class
# Placement doesn't know about classes with zero usage
# so default to zero to tell oslo.limit usage is zero
resource_counts[resource_name] = usages.get(resource_class, 0)
return resource_counts
def _get_deltas_by_flavor(
flavor: 'objects.Flavor', is_bfv: bool, count: int
) -> ty.Dict[str, int]:
if flavor is None:
raise ValueError("flavor")
if count < 0:
raise ValueError("count")
# NOTE(johngarbutt): this skips bfv, port, and cyborg resources
# but it still gives us better checks than before unified limits
# We need an instance in the DB to use the current is_bfv logic
# which doesn't work well for instances that don't yet have a uuid
deltas_from_flavor = utils.resources_for_limits(flavor, is_bfv)
deltas = {"servers": count}
for resource, amount in deltas_from_flavor.items():
if amount != 0:
deltas["class:%s" % resource] = amount * count
return deltas
def _get_enforcer(
context: 'nova.context.RequestContext', project_id: str
) -> limit.Enforcer:
# NOTE(johngarbutt) should we move context arg into oslo.limit?
def callback(project_id, resource_names):
return _get_usage(context, project_id, resource_names)
return limit.Enforcer(callback)
def enforce_num_instances_and_flavor(
context: 'nova.context.RequestContext',
project_id: str,
flavor: 'objects.Flavor',
is_bfvm: bool,
min_count: int,
max_count: int,
enforcer: ty.Optional[limit.Enforcer] = None
) -> int:
"""Return max instances possible, else raise TooManyInstances exception."""
if not limit_utils.use_unified_limits():
return max_count
# Ensure the recursion will always complete
if min_count < 0 or min_count > max_count:
raise ValueError("invalid min_count")
if max_count < 0:
raise ValueError("invalid max_count")
deltas = _get_deltas_by_flavor(flavor, is_bfvm, max_count)
enforcer = _get_enforcer(context, project_id)
try:
enforcer.enforce(project_id, deltas)
except limit_exceptions.ProjectOverLimit as e:
# NOTE(johngarbutt) we can do better, but this is very simple
LOG.debug("Limit check failed with count %s retrying with count %s",
max_count, max_count - 1)
try:
return enforce_num_instances_and_flavor(context, project_id,
flavor, is_bfvm, min_count,
max_count - 1,
enforcer=enforcer)
except ValueError:
# Copy the *original* exception message to a OverQuota to
# propagate to the API layer
raise exception.TooManyInstances(str(e))
# no problems with max_count, so we return max count
return max_count
def _convert_keys_to_legacy_name(new_dict):
legacy = {}
for new_name, old_name in LEGACY_LIMITS.items():
# defensive incase oslo or keystone doesn't give us an answer
legacy[old_name] = new_dict.get(new_name) or 0
return legacy
def get_legacy_default_limits():
enforcer = limit.Enforcer(lambda: None)
new_limits = enforcer.get_registered_limits(LEGACY_LIMITS.keys())
return _convert_keys_to_legacy_name(dict(new_limits))
def get_legacy_project_limits(project_id):
enforcer = limit.Enforcer(lambda: None)
new_limits = enforcer.get_project_limits(project_id, LEGACY_LIMITS.keys())
return _convert_keys_to_legacy_name(dict(new_limits))
def get_legacy_counts(context, project_id):
resource_names = list(LEGACY_LIMITS.keys())
resource_names.sort()
new_usage = _get_usage(context, project_id, resource_names)
return _convert_keys_to_legacy_name(new_usage)
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