141 lines
4.1 KiB
Go
141 lines
4.1 KiB
Go
/*
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Copyright 2019 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 kustomize
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import (
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"bytes"
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"encoding/json"
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"io"
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"strings"
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"github.com/pkg/errors"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/util/yaml"
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"sigs.k8s.io/kustomize/pkg/ifc"
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)
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// strategicMergeSlice is a slice of strategic merge patches.
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// Unstructured objects are used to represent strategic merge patches of any group/version/kind.
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type strategicMergeSlice []*unstructured.Unstructured
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// newStrategicMergeSliceFromFile returns a slice of strategic merge patches from a file
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func newStrategicMergeSliceFromFile(loader ifc.Loader, path string) (strategicMergeSlice, error) {
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content, err := loader.Load(path)
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if err != nil {
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return nil, errors.Wrapf(err, "load from path %q failed", path)
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}
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res, err := newStrategicMergeSliceFromBytes(content)
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if err != nil {
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return nil, errors.Wrapf(err, "convert %q to Unstructured failed", path)
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}
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return res, nil
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}
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// newStrategicMergeSliceFromBytes returns a strategic merge patches contained in a []byte.
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// This functions handles all the nuances of Kubernetes yaml (e.g. many yaml
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// documents in one file, List of objects)
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func newStrategicMergeSliceFromBytes(in []byte) (strategicMergeSlice, error) {
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decoder := yaml.NewYAMLOrJSONDecoder(bytes.NewReader(in), 1024)
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var result strategicMergeSlice
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var err error
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// Parse all the yaml documents in the file
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for err == nil || isEmptyYamlError(err) {
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var u unstructured.Unstructured
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err = decoder.Decode(&u)
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// if the yaml document is a valid unstructured object
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if err == nil {
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// it the unstructured object is empty, move to the next
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if len(u.Object) == 0 {
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continue
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}
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// validate the object has kind, metadata.name as required by Kustomize
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if err := validate(u); err != nil {
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return nil, err
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}
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// if the document is a list of objects
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if strings.HasSuffix(u.GetKind(), "List") {
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// for each item in the list of objects
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if err := u.EachListItem(func(item runtime.Object) error {
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// Marshal the object
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itemJSON, err := json.Marshal(item)
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if err != nil {
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return err
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}
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// Get the stategicMergeSlice for the item
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itemU, err := newStrategicMergeSliceFromBytes(itemJSON)
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if err != nil {
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return err
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}
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// append the stategicMergeSlice for the item to the stategicMergeSlice
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result = append(result, itemU...)
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return nil
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}); err != nil {
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return nil, err
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}
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continue
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}
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// append the object to the stategicMergeSlice
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result = append(result, &u)
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}
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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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// filterByResource returns all the strategic merge patches in the strategicMergeSlice corresponding to a given resource
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func (s *strategicMergeSlice) filterByResource(r *unstructured.Unstructured) strategicMergeSlice {
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var result strategicMergeSlice
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for _, p := range *s {
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if p.GroupVersionKind() == r.GroupVersionKind() &&
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p.GetNamespace() == r.GetNamespace() &&
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p.GetName() == r.GetName() {
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result = append(result, p)
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}
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}
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return result
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}
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// validate validates that u has kind and name
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// except for kind `List`, which doesn't require a name
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func validate(u unstructured.Unstructured) error {
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kind := u.GetKind()
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if kind == "" {
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return errors.New("missing kind in object")
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} else if strings.HasSuffix(kind, "List") {
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return nil
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}
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if u.GetName() == "" {
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return errors.New("missing metadata.name in object")
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}
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return nil
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}
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func isEmptyYamlError(err error) bool {
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return strings.Contains(err.Error(), "is missing in 'null'")
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}
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