mirror of https://github.com/k3s-io/k3s
90 lines
3.6 KiB
Go
90 lines
3.6 KiB
Go
/*
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Copyright 2021 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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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,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package fieldmanager
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import (
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"context"
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"fmt"
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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apiserver/pkg/admission"
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"k8s.io/apiserver/pkg/warning"
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)
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// InvalidManagedFieldsAfterMutatingAdmissionWarningFormat is the warning that a client receives
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// when a create/update/patch request results in invalid managedFields after going through the admission chain.
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const InvalidManagedFieldsAfterMutatingAdmissionWarningFormat = ".metadata.managedFields was in an invalid state after admission; this could be caused by an outdated mutating admission controller; please fix your requests: %v"
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// NewManagedFieldsValidatingAdmissionController validates the managedFields after calling
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// the provided admission and resets them to their original state if they got changed to an invalid value
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func NewManagedFieldsValidatingAdmissionController(wrap admission.Interface) admission.Interface {
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if wrap == nil {
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return nil
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}
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return &managedFieldsValidatingAdmissionController{wrap: wrap}
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}
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type managedFieldsValidatingAdmissionController struct {
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wrap admission.Interface
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}
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var _ admission.Interface = &managedFieldsValidatingAdmissionController{}
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var _ admission.MutationInterface = &managedFieldsValidatingAdmissionController{}
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var _ admission.ValidationInterface = &managedFieldsValidatingAdmissionController{}
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// Handles calls the wrapped admission.Interface if applicable
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func (admit *managedFieldsValidatingAdmissionController) Handles(operation admission.Operation) bool {
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return admit.wrap.Handles(operation)
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}
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// Admit calls the wrapped admission.Interface if applicable and resets the managedFields to their state before admission if they
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// got modified in an invalid way
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func (admit *managedFieldsValidatingAdmissionController) Admit(ctx context.Context, a admission.Attributes, o admission.ObjectInterfaces) (err error) {
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mutationInterface, isMutationInterface := admit.wrap.(admission.MutationInterface)
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if !isMutationInterface {
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return nil
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}
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objectMeta, err := meta.Accessor(a.GetObject())
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if err != nil {
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// the object we are dealing with doesn't have object metadata defined
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// in that case we don't have to keep track of the managedField
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// just call the wrapped admission
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return mutationInterface.Admit(ctx, a, o)
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}
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managedFieldsBeforeAdmission := objectMeta.GetManagedFields()
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if err := mutationInterface.Admit(ctx, a, o); err != nil {
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return err
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}
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managedFieldsAfterAdmission := objectMeta.GetManagedFields()
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if _, err := DecodeManagedFields(managedFieldsAfterAdmission); err != nil {
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objectMeta.SetManagedFields(managedFieldsBeforeAdmission)
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warning.AddWarning(ctx, "",
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fmt.Sprintf(InvalidManagedFieldsAfterMutatingAdmissionWarningFormat,
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err.Error()),
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)
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}
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return nil
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}
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// Validate calls the wrapped admission.Interface if aplicable
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func (admit *managedFieldsValidatingAdmissionController) Validate(ctx context.Context, a admission.Attributes, o admission.ObjectInterfaces) (err error) {
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if validationInterface, isValidationInterface := admit.wrap.(admission.ValidationInterface); isValidationInterface {
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return validationInterface.Validate(ctx, a, o)
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}
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return nil
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}
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