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namereference.go
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/
namereference.go
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/*
Copyright 2018 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 transformers
import (
"errors"
"fmt"
"sigs.k8s.io/kustomize/pkg/gvk"
"sigs.k8s.io/kustomize/pkg/resmap"
"sigs.k8s.io/kustomize/pkg/transformers/config"
)
type nameReferenceTransformer struct {
backRefs []config.NameBackReferences
}
var _ Transformer = &nameReferenceTransformer{}
// NewNameReferenceTransformer constructs a nameReferenceTransformer
// with a given slice of NameBackReferences.
func NewNameReferenceTransformer(
br []config.NameBackReferences) (Transformer, error) {
if br == nil {
return nil, errors.New("backrefs not expected to be nil")
}
return &nameReferenceTransformer{backRefs: br}, nil
}
// Transform does the field update according to fieldSpecs.
// The old name is in the key in the map and the new name is in the object
// associated with the key. e.g. if <k, v> is one of the key-value pair in the map,
// then the old name is k.Name and the new name is v.GetName()
func (o *nameReferenceTransformer) Transform(m resmap.ResMap) error {
// TODO: Too much looping.
// Even more hidden loops in FilterBy,
// updateNameReference and FindByGVKN.
for id := range m {
for _, backRef := range o.backRefs {
for _, fSpec := range backRef.FieldSpecs {
if id.Gvk().IsSelected(&fSpec.Gvk) {
err := mutateField(
m[id].Map(), fSpec.PathSlice(),
fSpec.CreateIfNotPresent,
o.updateNameReference(
backRef.Gvk, m.FilterBy(id)))
if err != nil {
return err
}
}
}
}
}
return nil
}
func (o *nameReferenceTransformer) updateNameReference(
backRef gvk.Gvk, m resmap.ResMap) func(in interface{}) (interface{}, error) {
return func(in interface{}) (interface{}, error) {
s, ok := in.(string)
if !ok {
return nil, fmt.Errorf("%#v is expected to be %T", in, s)
}
for id, res := range m {
if id.Gvk().IsSelected(&backRef) && id.Name() == s {
matchedIds := m.FindByGVKN(id)
// If there's more than one match, there's no way
// to know which one to pick, so emit error.
if len(matchedIds) > 1 {
return nil, fmt.Errorf(
"Multiple matches for name %s:\n %v", id, matchedIds)
}
// Return transformed name of the object,
// complete with prefixes, hashes, etc.
return res.GetName(), nil
}
}
return in, nil
}
}