80 lines
2.4 KiB
Python
80 lines
2.4 KiB
Python
# Copyright 2020 Red Hat, Inc. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Validators for all extra specs known by nova."""
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import re
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import typing as ty
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from oslo_log import log as logging
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from stevedore import extension
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from nova.api.validation.extra_specs import base
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from nova import exception
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LOG = logging.getLogger(__name__)
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VALIDATORS: ty.Dict[str, base.ExtraSpecValidator] = {}
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def validate(name: str, value: str, mode: str):
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"""Validate a given extra spec.
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:param name: Extra spec name.
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:param value: Extra spec value.
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:param mode: Validation mode; one of: strict, permissive, disabled
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:raises: exception.ValidationError if validation fails.
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"""
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if mode == 'disabled':
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return
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# attempt a basic lookup for extra specs without embedded parameters
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if name in VALIDATORS:
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VALIDATORS[name].validate(name, value)
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return
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# if that failed, fallback to a linear search through the registry
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for validator in VALIDATORS.values():
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if re.fullmatch(validator.name_regex, name):
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validator.validate(name, value)
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return
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if mode == 'permissive': # unregistered extra spec, ignore
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return
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raise exception.ValidationError(
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f"Validation failed; extra spec '{name}' does not appear to be a "
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f"valid extra spec."
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)
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def load_validators():
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global VALIDATORS
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def _report_load_failure(mgr, ep, err):
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LOG.warning(u'Failed to load %s: %s', ep.module_name, err)
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mgr = extension.ExtensionManager(
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'nova.api.extra_spec_validators',
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on_load_failure_callback=_report_load_failure,
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invoke_on_load=False,
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)
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for ext in mgr:
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# TODO(stephenfin): Make 'register' return a dict rather than a list?
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for validator in ext.plugin.register():
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VALIDATORS[validator.name] = validator
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load_validators()
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