mirror of https://github.com/k3s-io/k3s
65 lines
2.3 KiB
Go
65 lines
2.3 KiB
Go
/*
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Copyright 2019 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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// newReinvocationHandler creates a handler that wraps the provided admission chain and reinvokes it
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// if needed according to re-invocation policy of the webhooks.
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func newReinvocationHandler(admissionChain Interface) Interface {
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return &reinvoker{admissionChain}
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}
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type reinvoker struct {
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admissionChain Interface
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}
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// Admit performs an admission control check using the wrapped admission chain, reinvoking the
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// admission chain if needed according to the reinvocation policy. Plugins are expected to check
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// the admission attributes' reinvocation context against their reinvocation policy to decide if
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// they should re-run, and to update the reinvocation context if they perform any mutations.
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func (r *reinvoker) Admit(ctx context.Context, a Attributes, o ObjectInterfaces) error {
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if mutator, ok := r.admissionChain.(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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s := a.GetReinvocationContext()
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if s.ShouldReinvoke() {
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s.SetIsReinvoke()
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// Calling admit a second time will reinvoke all in-tree plugins
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// as well as any webhook plugins that need to be reinvoked based on the
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// reinvocation policy.
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return mutator.Admit(ctx, a, o)
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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 the wrapped admission chain, and returns immediately on first error.
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func (r *reinvoker) Validate(ctx context.Context, a Attributes, o ObjectInterfaces) error {
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if validator, ok := r.admissionChain.(ValidationInterface); ok {
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return validator.Validate(ctx, a, o)
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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 admission chain handlers handle the given operation.
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func (r *reinvoker) Handles(operation Operation) bool {
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return r.admissionChain.Handles(operation)
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}
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