134 lines
3.6 KiB
Go
134 lines
3.6 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 mergepatch
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import (
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"fmt"
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"reflect"
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"github.com/davecgh/go-spew/spew"
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"sigs.k8s.io/yaml"
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)
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// PreconditionFunc asserts that an incompatible change is not present within a patch.
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type PreconditionFunc func(interface{}) bool
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// RequireKeyUnchanged returns a precondition function that fails if the provided key
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// is present in the patch (indicating that its value has changed).
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func RequireKeyUnchanged(key string) PreconditionFunc {
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return func(patch interface{}) bool {
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patchMap, ok := patch.(map[string]interface{})
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if !ok {
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return true
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}
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// The presence of key means that its value has been changed, so the test fails.
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_, ok = patchMap[key]
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return !ok
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}
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}
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// RequireMetadataKeyUnchanged creates a precondition function that fails
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// if the metadata.key is present in the patch (indicating its value
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// has changed).
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func RequireMetadataKeyUnchanged(key string) PreconditionFunc {
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return func(patch interface{}) bool {
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patchMap, ok := patch.(map[string]interface{})
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if !ok {
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return true
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}
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patchMap1, ok := patchMap["metadata"]
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if !ok {
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return true
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}
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patchMap2, ok := patchMap1.(map[string]interface{})
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if !ok {
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return true
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}
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_, ok = patchMap2[key]
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return !ok
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}
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}
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func ToYAMLOrError(v interface{}) string {
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y, err := toYAML(v)
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if err != nil {
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return err.Error()
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}
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return y
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}
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func toYAML(v interface{}) (string, error) {
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y, err := yaml.Marshal(v)
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if err != nil {
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return "", fmt.Errorf("yaml marshal failed:%v\n%v\n", err, spew.Sdump(v))
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}
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return string(y), nil
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}
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// HasConflicts returns true if the left and right JSON interface objects overlap with
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// different values in any key. All keys are required to be strings. Since patches of the
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// same Type have congruent keys, this is valid for multiple patch types. This method
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// supports JSON merge patch semantics.
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//
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// NOTE: Numbers with different types (e.g. int(0) vs int64(0)) will be detected as conflicts.
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// Make sure the unmarshaling of left and right are consistent (e.g. use the same library).
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func HasConflicts(left, right interface{}) (bool, error) {
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switch typedLeft := left.(type) {
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case map[string]interface{}:
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switch typedRight := right.(type) {
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case map[string]interface{}:
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for key, leftValue := range typedLeft {
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rightValue, ok := typedRight[key]
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if !ok {
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continue
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}
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if conflict, err := HasConflicts(leftValue, rightValue); err != nil || conflict {
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return conflict, err
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}
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}
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return false, nil
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default:
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return true, nil
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}
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case []interface{}:
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switch typedRight := right.(type) {
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case []interface{}:
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if len(typedLeft) != len(typedRight) {
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return true, nil
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}
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for i := range typedLeft {
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if conflict, err := HasConflicts(typedLeft[i], typedRight[i]); err != nil || conflict {
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return conflict, err
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}
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}
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return false, nil
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default:
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return true, nil
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}
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case string, float64, bool, int64, nil:
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return !reflect.DeepEqual(left, right), nil
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default:
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return true, fmt.Errorf("unknown type: %v", reflect.TypeOf(left))
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}
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}
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