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# Copyright 2020 Red Hat, Inc. 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.
"""Validators for all extra specs known by nova."""
import re
import typing as ty
from oslo_log import log as logging
from stevedore import extension
from nova.api.validation.extra_specs import base
from nova import exception
LOG = logging.getLogger(__name__)
VALIDATORS: ty.Dict[str, base.ExtraSpecValidator] = {}
NAMESPACES: ty.Set[str] = set()
def validate(name: str, value: str):
"""Validate a given extra spec.
:param name: Extra spec name.
:param value: Extra spec value.
:raises: exception.ValidationError if validation fails.
"""
# attempt a basic lookup for extra specs without embedded parameters
if name in VALIDATORS:
VALIDATORS[name].validate(name, value)
return
# if that failed, fallback to a linear search through the registry
for validator in VALIDATORS.values():
if re.fullmatch(validator.name_regex, name):
validator.validate(name, value)
return
# check if there's a namespace; if not, we've done all we can do
if ':' not in name: # no namespace
return
# if there is, check if it's one we recognize
for namespace in NAMESPACES:
if re.fullmatch(namespace, name.split(':', 1)[0]):
break
else:
return
raise exception.ValidationError(
f"Validation failed; extra spec '{name}' does not appear to be a "
f"valid extra spec."
)
def load_validators():
global VALIDATORS
def _report_load_failure(mgr, ep, err):
LOG.warning(u'Failed to load %s: %s', ep.module_name, err)
mgr = extension.ExtensionManager(
'nova.api.extra_spec_validators',
on_load_failure_callback=_report_load_failure,
invoke_on_load=False,
)
for ext in mgr:
# TODO(stephenfin): Make 'register' return a dict rather than a list?
for validator in ext.plugin.register():
VALIDATORS[validator.name] = validator
if ':' in validator.name_regex:
NAMESPACES.add(validator.name_regex.split(':', 1)[0])
load_validators()
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