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71 lines
2.2 KiB
71 lines
2.2 KiB
/*
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Copyright 2014 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 admission
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import "context"
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// chainAdmissionHandler is an instance of admission.NamedHandler that performs admission control using
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// a chain of admission handlers
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type chainAdmissionHandler []Interface
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// NewChainHandler creates a new chain handler from an array of handlers. Used for testing.
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func NewChainHandler(handlers ...Interface) chainAdmissionHandler {
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return chainAdmissionHandler(handlers)
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}
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// Admit performs an admission control check using a chain of handlers, and returns immediately on first error
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func (admissionHandler chainAdmissionHandler) Admit(ctx context.Context, a Attributes, o ObjectInterfaces) error {
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for _, handler := range admissionHandler {
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if !handler.Handles(a.GetOperation()) {
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continue
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}
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if mutator, ok := handler.(MutationInterface); ok {
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err := mutator.Admit(ctx, a, o)
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if err != nil {
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return err
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}
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}
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}
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return nil
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}
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// Validate performs an admission control check using a chain of handlers, and returns immediately on first error
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func (admissionHandler chainAdmissionHandler) Validate(ctx context.Context, a Attributes, o ObjectInterfaces) error {
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for _, handler := range admissionHandler {
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if !handler.Handles(a.GetOperation()) {
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continue
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}
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if validator, ok := handler.(ValidationInterface); ok {
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err := validator.Validate(ctx, a, o)
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if err != nil {
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return err
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}
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}
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}
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return nil
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}
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// Handles will return true if any of the handlers handles the given operation
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func (admissionHandler chainAdmissionHandler) Handles(operation Operation) bool {
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for _, handler := range admissionHandler {
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if handler.Handles(operation) {
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return true
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}
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}
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return false
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}
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