github.com/mirantis/virtlet@v1.5.2-0.20191204181327-1659b8a48e9b/pkg/tools/kubeyaml.go (about)

     1  /*
     2  Copyright 2018 Mirantis
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package tools
    18  
    19  import (
    20  	"bytes"
    21  	"encoding/json"
    22  
    23  	"github.com/ghodss/yaml"
    24  	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
    25  	"k8s.io/apimachinery/pkg/runtime"
    26  	"k8s.io/client-go/kubernetes/scheme"
    27  )
    28  
    29  // LoadYaml loads a k8s YAML data and returns a slice of k8s objects
    30  func LoadYaml(data []byte) ([]runtime.Object, error) {
    31  	parts := bytes.Split(data, []byte("---"))
    32  	var r []runtime.Object
    33  	for _, part := range parts {
    34  		part = bytes.TrimSpace(part)
    35  		if len(part) == 0 {
    36  			continue
    37  		}
    38  		obj, _, err := scheme.Codecs.UniversalDeserializer().Decode([]byte(part), nil, nil)
    39  		if err != nil {
    40  			return nil, err
    41  		}
    42  		r = append(r, obj)
    43  	}
    44  	return r, nil
    45  }
    46  
    47  // ToYaml converts a slice of k8s objects to YAML
    48  func ToYaml(objs []runtime.Object) ([]byte, error) {
    49  	var out bytes.Buffer
    50  	for _, obj := range objs {
    51  		// the idea is from https://github.com/ant31/crd-validation/blob/master/pkg/cli-utils.go
    52  		bs, err := json.Marshal(obj)
    53  		if err != nil {
    54  			return nil, err
    55  		}
    56  
    57  		var us unstructured.Unstructured
    58  		if err := json.Unmarshal(bs, &us.Object); err != nil {
    59  			return nil, err
    60  		}
    61  
    62  		unstructured.RemoveNestedField(us.Object, "status")
    63  
    64  		bs, err = yaml.Marshal(us.Object)
    65  		if err != nil {
    66  			return nil, err
    67  		}
    68  		out.WriteString("---\n")
    69  		out.Write(bs)
    70  		out.WriteString("\n")
    71  	}
    72  	return out.Bytes(), nil
    73  }