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serialize.go
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serialize.go
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package k8s
import (
"bufio"
"bytes"
"io"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer/json"
"k8s.io/apimachinery/pkg/util/yaml"
"k8s.io/client-go/kubernetes/scheme"
)
func ParseYAMLFromString(yaml string) ([]K8sEntity, error) {
buf := bytes.NewBuffer([]byte(yaml))
return ParseYAML(buf)
}
// Parse the YAML into entities.
// Loosely based on
// https://github.com/kubernetes/cli-runtime/blob/d6a36215b15f83b94578f2ffce5d00447972e8ae/pkg/genericclioptions/resource/visitor.go#L583
func ParseYAML(k8sYaml io.Reader) ([]K8sEntity, error) {
reader := bufio.NewReader(k8sYaml)
decoder := yaml.NewYAMLOrJSONDecoder(reader, 4096)
result := make([]K8sEntity, 0)
for {
ext := runtime.RawExtension{}
if err := decoder.Decode(&ext); err != nil {
if err == io.EOF {
break
}
return nil, err
}
ext.Raw = bytes.TrimSpace(ext.Raw)
// NOTE(nick): I LOL'd at the null check, but it's what kubectl does.
if len(ext.Raw) == 0 || bytes.Equal(ext.Raw, []byte("null")) {
continue
}
obj, groupVersionKind, err :=
scheme.Codecs.UniversalDeserializer().Decode(ext.Raw, nil, nil)
if err == nil {
result = append(result, K8sEntity{
Obj: obj,
Kind: groupVersionKind,
})
continue
}
if !runtime.IsNotRegisteredError(err) {
return nil, err
}
// If this is a NotRegisteredError, fallback to unstructured code
obj, groupVersionKind, err =
unstructured.UnstructuredJSONScheme.Decode(ext.Raw, nil, nil)
if err != nil {
return nil, err
}
result = append(result, K8sEntity{
Obj: obj,
Kind: groupVersionKind,
})
}
return result, nil
}
func SerializeYAML(decoded []K8sEntity) (string, error) {
yamlSerializer := json.NewYAMLSerializer(json.DefaultMetaFactory, scheme.Scheme, scheme.Scheme)
buf := bytes.NewBuffer(nil)
for i, obj := range decoded {
if i != 0 {
buf.Write([]byte("\n---\n"))
}
err := yamlSerializer.Encode(obj.Obj, buf)
if err != nil {
return "", err
}
}
return buf.String(), nil
}