mirror of https://github.com/docker/cli.git
134 lines
3.6 KiB
Go
134 lines
3.6 KiB
Go
/*
|
|
Copyright 2017 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package mergepatch
|
|
|
|
import (
|
|
"fmt"
|
|
"reflect"
|
|
|
|
"github.com/davecgh/go-spew/spew"
|
|
"github.com/ghodss/yaml"
|
|
)
|
|
|
|
// PreconditionFunc asserts that an incompatible change is not present within a patch.
|
|
type PreconditionFunc func(interface{}) bool
|
|
|
|
// RequireKeyUnchanged returns a precondition function that fails if the provided key
|
|
// is present in the patch (indicating that its value has changed).
|
|
func RequireKeyUnchanged(key string) PreconditionFunc {
|
|
return func(patch interface{}) bool {
|
|
patchMap, ok := patch.(map[string]interface{})
|
|
if !ok {
|
|
return true
|
|
}
|
|
|
|
// The presence of key means that its value has been changed, so the test fails.
|
|
_, ok = patchMap[key]
|
|
return !ok
|
|
}
|
|
}
|
|
|
|
// RequireMetadataKeyUnchanged creates a precondition function that fails
|
|
// if the metadata.key is present in the patch (indicating its value
|
|
// has changed).
|
|
func RequireMetadataKeyUnchanged(key string) PreconditionFunc {
|
|
return func(patch interface{}) bool {
|
|
patchMap, ok := patch.(map[string]interface{})
|
|
if !ok {
|
|
return true
|
|
}
|
|
patchMap1, ok := patchMap["metadata"]
|
|
if !ok {
|
|
return true
|
|
}
|
|
patchMap2, ok := patchMap1.(map[string]interface{})
|
|
if !ok {
|
|
return true
|
|
}
|
|
_, ok = patchMap2[key]
|
|
return !ok
|
|
}
|
|
}
|
|
|
|
func ToYAMLOrError(v interface{}) string {
|
|
y, err := toYAML(v)
|
|
if err != nil {
|
|
return err.Error()
|
|
}
|
|
|
|
return y
|
|
}
|
|
|
|
func toYAML(v interface{}) (string, error) {
|
|
y, err := yaml.Marshal(v)
|
|
if err != nil {
|
|
return "", fmt.Errorf("yaml marshal failed:%v\n%v\n", err, spew.Sdump(v))
|
|
}
|
|
|
|
return string(y), nil
|
|
}
|
|
|
|
// HasConflicts returns true if the left and right JSON interface objects overlap with
|
|
// different values in any key. All keys are required to be strings. Since patches of the
|
|
// same Type have congruent keys, this is valid for multiple patch types. This method
|
|
// supports JSON merge patch semantics.
|
|
//
|
|
// NOTE: Numbers with different types (e.g. int(0) vs int64(0)) will be detected as conflicts.
|
|
// Make sure the unmarshaling of left and right are consistent (e.g. use the same library).
|
|
func HasConflicts(left, right interface{}) (bool, error) {
|
|
switch typedLeft := left.(type) {
|
|
case map[string]interface{}:
|
|
switch typedRight := right.(type) {
|
|
case map[string]interface{}:
|
|
for key, leftValue := range typedLeft {
|
|
rightValue, ok := typedRight[key]
|
|
if !ok {
|
|
continue
|
|
}
|
|
if conflict, err := HasConflicts(leftValue, rightValue); err != nil || conflict {
|
|
return conflict, err
|
|
}
|
|
}
|
|
|
|
return false, nil
|
|
default:
|
|
return true, nil
|
|
}
|
|
case []interface{}:
|
|
switch typedRight := right.(type) {
|
|
case []interface{}:
|
|
if len(typedLeft) != len(typedRight) {
|
|
return true, nil
|
|
}
|
|
|
|
for i := range typedLeft {
|
|
if conflict, err := HasConflicts(typedLeft[i], typedRight[i]); err != nil || conflict {
|
|
return conflict, err
|
|
}
|
|
}
|
|
|
|
return false, nil
|
|
default:
|
|
return true, nil
|
|
}
|
|
case string, float64, bool, int, int64, nil:
|
|
return !reflect.DeepEqual(left, right), nil
|
|
default:
|
|
return true, fmt.Errorf("unknown type: %v", reflect.TypeOf(left))
|
|
}
|
|
}
|