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c470982ce5
If path segments end with the special marker `[]` in transformer configs, this indicates that the respective path segment is supposed to be an array. That information may be used to suppress the meaningless creation of non-existent paths that should be arrays, not objects.
91 lines
2.1 KiB
Go
91 lines
2.1 KiB
Go
/*
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Copyright 2018 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 transformers
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import (
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"fmt"
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"log"
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"strings"
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)
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type mutateFunc func(interface{}) (interface{}, error)
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func mutateField(
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m map[string]interface{},
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pathToField []string,
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createIfNotPresent bool,
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fns ...mutateFunc) error {
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if len(pathToField) == 0 {
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return nil
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}
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firstPathSegment, isArray := getFirstPathSegment(pathToField)
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_, found := m[firstPathSegment]
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if !found {
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if !createIfNotPresent || isArray {
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return nil
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}
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m[firstPathSegment] = map[string]interface{}{}
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}
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if len(pathToField) == 1 {
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var err error
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for _, fn := range fns {
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m[firstPathSegment], err = fn(m[firstPathSegment])
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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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return nil
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}
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v := m[firstPathSegment]
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newPathToField := pathToField[1:]
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switch typedV := v.(type) {
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case nil:
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log.Printf(
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"nil value at `%s` ignored in mutation attempt",
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strings.Join(pathToField, "."))
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return nil
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case map[string]interface{}:
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return mutateField(typedV, newPathToField, createIfNotPresent, fns...)
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case []interface{}:
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for i := range typedV {
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item := typedV[i]
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typedItem, ok := item.(map[string]interface{})
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if !ok {
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return fmt.Errorf("%#v is expected to be %T", item, typedItem)
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}
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err := mutateField(typedItem, newPathToField, createIfNotPresent, fns...)
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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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return nil
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default:
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return fmt.Errorf("%#v is not expected to be a primitive type", typedV)
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}
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}
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func getFirstPathSegment(pathToField []string) (string, bool) {
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if strings.HasSuffix(pathToField[0], "[]") {
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return pathToField[0][:len(pathToField[0])-2], true
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}
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return pathToField[0], false
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}
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