mirror of https://github.com/k3s-io/k3s
108 lines
3.5 KiB
Go
108 lines
3.5 KiB
Go
/*
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Copyright 2017 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 strategy
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import (
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"k8s.io/kubernetes/pkg/kubectl/apply"
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)
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// replaceVisitor creates a patch to replace a remote field value with a local field value
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type replaceStrategy struct {
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strategic *delegatingStrategy
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options Options
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}
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func createReplaceStrategy(options Options, strategic *delegatingStrategy) replaceStrategy {
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return replaceStrategy{
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strategic,
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options,
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}
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}
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// MergeList returns a result by merging the recorded, local and remote values
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// - replacing the remote value with the local value
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func (v replaceStrategy) MergeList(e apply.ListElement) (apply.Result, error) {
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return v.doReplace(e)
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}
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// MergeMap returns a result by merging the recorded, local and remote values
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// - replacing the remote value with the local value
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func (v replaceStrategy) MergeMap(e apply.MapElement) (apply.Result, error) {
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return v.doReplace(e)
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}
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// MergeType returns a result by merging the recorded, local and remote values
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// - replacing the remote value with the local value
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func (v replaceStrategy) MergeType(e apply.TypeElement) (apply.Result, error) {
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return v.doReplace(e)
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}
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// MergePrimitive returns a result by merging the recorded, local and remote values
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// - replacing the remote value with the local value
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func (v replaceStrategy) MergePrimitive(e apply.PrimitiveElement) (apply.Result, error) {
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return v.doReplace(e)
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}
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// MergeEmpty
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func (v replaceStrategy) MergeEmpty(e apply.EmptyElement) (apply.Result, error) {
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return apply.Result{Operation: apply.SET}, nil
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}
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// replace returns the local value if specified, otherwise it returns the remote value
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// this works regardless of the approach
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func (v replaceStrategy) doReplace(e apply.Element) (apply.Result, error) {
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if result, done := v.doAddOrDelete(e); done {
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return result, nil
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}
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if err := v.doConflictDetect(e); err != nil {
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return apply.Result{}, err
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}
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if e.HasLocal() {
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// Specified locally, set the local value
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return apply.Result{Operation: apply.SET, MergedResult: e.GetLocal()}, nil
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} else if e.HasRemote() {
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// Not specified locally, set the remote value
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return apply.Result{Operation: apply.SET, MergedResult: e.GetRemote()}, nil
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} else {
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// Only specified in the recorded, drop the field.
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return apply.Result{Operation: apply.DROP, MergedResult: e.GetRemote()}, nil
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}
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}
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// doAddOrDelete will check if the field should be either added or deleted. If either is true, it will
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// true the operation and true. Otherwise it will return false.
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func (v replaceStrategy) doAddOrDelete(e apply.Element) (apply.Result, bool) {
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if apply.IsAdd(e) {
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return apply.Result{Operation: apply.SET, MergedResult: e.GetLocal()}, true
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}
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// Delete the List
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if apply.IsDrop(e) {
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return apply.Result{Operation: apply.DROP}, true
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}
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return apply.Result{}, false
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}
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// doConflictDetect returns error if element has conflict
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func (v replaceStrategy) doConflictDetect(e apply.Element) error {
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return v.strategic.doConflictDetect(e)
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}
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var _ apply.Strategy = &replaceStrategy{}
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