mirror of https://github.com/k3s-io/k3s
86 lines
2.1 KiB
Go
86 lines
2.1 KiB
Go
// Copyright 2019 The Kubernetes Authors.
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// SPDX-License-Identifier: Apache-2.0
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package target
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import (
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"fmt"
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"sigs.k8s.io/kustomize/api/resmap"
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)
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// multiTransformer contains a list of transformers.
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type multiTransformer struct {
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transformers []resmap.Transformer
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checkConflictEnabled bool
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}
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var _ resmap.Transformer = &multiTransformer{}
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// newMultiTransformer constructs a multiTransformer.
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func newMultiTransformer(t []resmap.Transformer) resmap.Transformer {
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r := &multiTransformer{
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transformers: make([]resmap.Transformer, len(t)),
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checkConflictEnabled: false}
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copy(r.transformers, t)
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return r
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}
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// Transform applies the member transformers in order to the resources,
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// optionally detecting and erroring on commutation conflict.
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func (o *multiTransformer) Transform(m resmap.ResMap) error {
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if o.checkConflictEnabled {
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return o.transformWithCheckConflict(m)
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}
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return o.transform(m)
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}
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func (o *multiTransformer) transform(m resmap.ResMap) error {
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for _, t := range o.transformers {
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err := t.Transform(m)
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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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for _, r := range m.Resources() {
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empty, err := r.IsEmpty()
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if err != nil {
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return err
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}
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if empty {
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err := m.Remove(r.CurId())
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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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// Of the len(o.transformers)! possible transformer orderings, compare to a reversed order.
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// A spot check to perform when the transformations are supposed to be commutative.
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// Fail if there's a difference in the result.
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func (o *multiTransformer) transformWithCheckConflict(m resmap.ResMap) error {
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mcopy := m.DeepCopy()
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err := o.transform(m)
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if err != nil {
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return err
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}
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o.reverseTransformers()
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err = o.transform(mcopy)
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if err != nil {
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return err
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}
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err = m.ErrorIfNotEqualSets(mcopy)
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if err != nil {
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return fmt.Errorf("found conflict between different patches\n%v", err)
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}
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return nil
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}
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func (o *multiTransformer) reverseTransformers() {
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for i, j := 0, len(o.transformers)-1; i < j; i, j = i+1, j-1 {
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o.transformers[i], o.transformers[j] = o.transformers[j], o.transformers[i]
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}
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}
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