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unstructured.go
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unstructured.go
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package unstructured
import (
"bytes"
"encoding/json"
"fmt"
"log/slog"
"regexp"
"strings"
jsonpatch "github.com/evanphx/json-patch/v5"
metaV1 "k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime/schema"
yamlUtil "k8s.io/apimachinery/pkg/runtime/serializer/yaml"
yaml "sigs.k8s.io/yaml/goyaml.v3"
"github.com/jlandowner/helm-chartsnap/pkg/api/v1alpha1"
)
var logger *slog.Logger
func SetLogger(slogr *slog.Logger) {
logger = slogr
}
func log() *slog.Logger {
if logger == nil {
logger = slog.Default()
}
return logger
}
func Encode(arr []metaV1.Unstructured) ([]byte, error) {
var buf bytes.Buffer
enc := yaml.NewEncoder(&buf)
enc.SetIndent(2)
for _, d := range arr {
if err := enc.Encode(d.Object); err != nil {
return nil, fmt.Errorf("failed to encode unstructured to YAML: %w", err)
}
}
if err := enc.Close(); err != nil {
return nil, fmt.Errorf("failed to close encoder: %w", err)
}
return buf.Bytes(), nil
}
func Decode(source string) ([]metaV1.Unstructured, []error) {
splitString := regexp.MustCompile(`(?m)^---$`).Split(source, -1)
resources := make([]metaV1.Unstructured, 0, len(splitString))
var errs []error = make([]error, 0)
for _, v := range splitString {
if strings.TrimSpace(v) == "" {
continue
}
// split lines and if all lines start with '#', it is skipped
empty := true
for _, line := range strings.Split(v, "\n") {
l := strings.TrimPrefix(line, " ")
l = strings.TrimPrefix(l, "\t")
if l != "" && !strings.HasPrefix(l, "#") {
empty = false
break
}
}
if empty {
continue
}
_, obj, err := StringToUnstructured(v)
if err != nil {
err := v1alpha1.NewUnknownError(v)
obj = err.Unstructured()
errs = append(errs, err)
}
resources = append(resources, *obj)
}
return resources, errs
}
func ApplyFixedValue(t v1alpha1.SnapshotConfig, manifests []metaV1.Unstructured) error {
for _, v := range t.DynamicFields {
for i, obj := range manifests {
if v.APIVersion == obj.GetAPIVersion() &&
v.Kind == obj.GetKind() &&
v.Name == obj.GetName() {
for _, p := range v.JSONPath {
newObj, err := Replace(manifests[i], p, v.DynamicValue())
if err != nil {
return fmt.Errorf("failed to replace json path: %w", err)
}
manifests[i] = *newObj
}
}
}
}
return nil
}
func Replace(obj metaV1.Unstructured, key, value string) (*metaV1.Unstructured, error) {
str_patch := fmt.Sprintf(`[{"op": "replace", "path": "%s", "value": "%s"}]`, key, value)
bytes_obj, err := UnstructuredToJSONBytes(obj.DeepCopy())
if err != nil {
return nil, fmt.Errorf("failed to encode unstructured to JSON: %w", err)
}
// patch JSON6902
patch, err := jsonpatch.DecodePatch([]byte(str_patch))
if err != nil {
return nil, fmt.Errorf("failed to decode patch: %w: %s", err, str_patch)
}
patched, err := patch.Apply(bytes_obj)
if err != nil {
return nil, fmt.Errorf("failed to patch JSON6902: %w: patch=%s: buf=%s", err, str_patch, bytes_obj)
}
_, patchedObj, err := BytesToUnstructured(patched)
return patchedObj, err
}
func StringToUnstructured(data string) (*schema.GroupVersionKind, *metaV1.Unstructured, error) {
return BytesToUnstructured([]byte(data))
}
func BytesToUnstructured(data []byte) (*schema.GroupVersionKind, *metaV1.Unstructured, error) {
obj := &metaV1.Unstructured{}
dec := yamlUtil.NewDecodingSerializer(metaV1.UnstructuredJSONScheme)
_, gvk, err := dec.Decode([]byte(data), nil, obj)
if err != nil {
return nil, nil, err
}
return gvk, obj, nil
}
func UnstructuredToJSONBytes(obj *metaV1.Unstructured) ([]byte, error) {
return json.Marshal(obj)
}