mirror of
https://github.com/kubernetes-sigs/kustomize.git
synced 2026-05-18 02:55:22 +00:00
251 lines
6.8 KiB
Go
251 lines
6.8 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 resmap implements a map from ResId to Resource that tracks all resources in a kustomization.
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package resmap
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import (
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"bytes"
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"fmt"
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"io"
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"reflect"
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"sort"
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"github.com/ghodss/yaml"
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"github.com/golang/glog"
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internal "github.com/kubernetes-sigs/kustomize/pkg/internal/error"
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"github.com/kubernetes-sigs/kustomize/pkg/loader"
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"github.com/kubernetes-sigs/kustomize/pkg/resource"
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"github.com/pkg/errors"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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k8syaml "k8s.io/apimachinery/pkg/util/yaml"
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)
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// ResMap is a map from ResId to Resource.
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type ResMap map[resource.ResId]*resource.Resource
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// EncodeAsYaml encodes a ResMap to YAML; encoded objects separated by `---`.
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func (m ResMap) EncodeAsYaml() ([]byte, error) {
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var ids []resource.ResId
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for id := range m {
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ids = append(ids, id)
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}
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sort.Sort(IdSlice(ids))
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firstObj := true
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var b []byte
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buf := bytes.NewBuffer(b)
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for _, id := range ids {
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obj := m[id]
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out, err := yaml.Marshal(obj)
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if err != nil {
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return nil, err
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}
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if firstObj {
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firstObj = false
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} else {
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_, err = buf.WriteString("---\n")
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if err != nil {
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return nil, err
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}
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}
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_, err = buf.Write(out)
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if err != nil {
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return nil, err
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}
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}
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return buf.Bytes(), nil
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}
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// ErrorIfNotEqual returns error if maps are not equal.
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func (m ResMap) ErrorIfNotEqual(m2 ResMap) error {
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if len(m) != len(m2) {
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var keySet1 []resource.ResId
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var keySet2 []resource.ResId
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for id := range m {
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keySet1 = append(keySet1, id)
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}
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for id := range m2 {
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keySet2 = append(keySet2, id)
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}
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return fmt.Errorf("maps has different number of entries: %#v doesn't equals %#v", keySet1, keySet2)
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}
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for id, obj1 := range m {
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obj2, found := m2[id]
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if !found {
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return fmt.Errorf("%#v doesn't exist in %#v", id, m2)
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}
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if !reflect.DeepEqual(obj1, obj2) {
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return fmt.Errorf("%#v doesn't deep equal %#v", obj1, obj2)
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}
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}
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return nil
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}
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func (m ResMap) insert(newName string, obj *unstructured.Unstructured) error {
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oldName := obj.GetName()
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gvk := obj.GroupVersionKind()
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id := resource.NewResId(gvk, oldName)
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if _, found := m[id]; found {
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return fmt.Errorf("the <name: %q, GroupVersionKind: %v> already exists in the map", oldName, gvk)
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}
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obj.SetName(newName)
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m[id] = resource.NewResourceFromUnstruct(*obj)
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return nil
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}
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// NewResourceSliceFromPatches returns a slice of resources given a patch path slice from a kustomization file.
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func NewResourceSliceFromPatches(
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loader loader.Loader, paths []string) ([]*resource.Resource, error) {
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var result []*resource.Resource
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for _, path := range paths {
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contents, err := loader.GlobLoad(path)
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if err != nil {
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return nil, err
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}
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for p, content := range contents {
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res, err := newResourceSliceFromBytes(content)
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if err != nil {
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return nil, internal.Handler(err, p)
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}
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result = append(result, res...)
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}
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}
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return result, nil
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}
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// NewResMapFromFiles returns a ResMap given a resource path slice.
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func NewResMapFromFiles(loader loader.Loader, paths []string) (ResMap, error) {
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var result []ResMap
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for _, path := range paths {
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contents, err := loader.GlobLoad(path)
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if err != nil {
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return nil, errors.Wrap(err, "Load from path "+path+" failed")
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}
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for p, content := range contents {
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res, err := newResMapFromBytes(content)
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if err != nil {
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return nil, internal.Handler(err, p)
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}
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result = append(result, res)
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}
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}
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return MergeWithoutOverride(result...)
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}
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// newResMapFromBytes decodes a list of objects in byte array format.
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func newResMapFromBytes(b []byte) (ResMap, error) {
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resources, err := newResourceSliceFromBytes(b)
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if err != nil {
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return nil, err
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}
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result := ResMap{}
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for _, res := range resources {
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id := res.Id()
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if _, found := result[id]; found {
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return result, fmt.Errorf("GroupVersionKindName: %#v already exists b the map", id)
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}
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result[id] = res
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}
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return result, nil
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}
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func newResMapFromResourceSlice(resources []*resource.Resource) (ResMap, error) {
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result := ResMap{}
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for _, res := range resources {
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id := res.Id()
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if _, found := result[id]; found {
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return nil, fmt.Errorf("duplicated %#v is not allowed", id)
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}
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result[id] = res
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}
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return result, nil
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}
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func newResourceSliceFromBytes(in []byte) ([]*resource.Resource, error) {
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decoder := k8syaml.NewYAMLOrJSONDecoder(bytes.NewReader(in), 1024)
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var result []*resource.Resource
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var err error
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for {
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var out unstructured.Unstructured
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err = decoder.Decode(&out)
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if err != nil {
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break
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}
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result = append(result, resource.NewResourceFromUnstruct(out))
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}
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if err != io.EOF {
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return nil, err
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}
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return result, nil
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}
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// MergeWithoutOverride combines multiple ResMap instances, failing on key collision.
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func MergeWithoutOverride(maps ...ResMap) (ResMap, error) {
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result := ResMap{}
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for _, m := range maps {
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for id, res := range m {
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if _, found := result[id]; found {
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return nil, fmt.Errorf("id '%q' already used", id)
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}
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result[id] = res
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}
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}
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return result, nil
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}
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// MergeWithOverride combines multiple ResMap instances, allowing and sometimes
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// demanding certain collisions.
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// When looping over the instances to combine them, if a resource id for resource X
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// is found to be already in the combined map, then the behavior field for X
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// must be BehaviorMerge or BehaviorReplace. If X is not in the map, then it's
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// behavior cannot be merge or replace.
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func MergeWithOverride(maps ...ResMap) (ResMap, error) {
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result := ResMap{}
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for _, m := range maps {
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for id, r := range m {
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if _, found := result[id]; found {
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switch r.Behavior() {
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case resource.BehaviorReplace:
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glog.V(4).Infof("Replace %v with %v", result[id].Object, r.Object)
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r.Replace(result[id])
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result[id] = r
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result[id].SetBehavior(resource.BehaviorCreate)
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case resource.BehaviorMerge:
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glog.V(4).Infof("Merging %v with %v", result[id].Object, r.Object)
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r.Merge(result[id])
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result[id] = r
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glog.V(4).Infof("Merged object is %v", result[id].Object)
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result[id].SetBehavior(resource.BehaviorCreate)
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default:
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return nil, fmt.Errorf("id %#v exists; must merge or replace", id)
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}
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} else {
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switch r.Behavior() {
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case resource.BehaviorMerge, resource.BehaviorReplace:
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return nil, fmt.Errorf("id %#v does not exist; cannot merge or replace", id)
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default:
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result[id] = r
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}
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}
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}
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}
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return result, nil
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}
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