yaml.go

Documentation: github.com/GoogleCloudPlatform/k8s-config-connector/operator/scripts/utils

     1  // Copyright 2022 Google LLC
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package utils
    16  
    17  import (
    18  	"bytes"
    19  	"fmt"
    20  	"io"
    21  	"io/ioutil"
    22  
    23  	"github.com/ghodss/yaml"
    24  	goyaml "gopkg.in/yaml.v2"
    25  	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
    26  )
    27  
    28  func UnstructToYaml(u *unstructured.Unstructured) ([]byte, error) {
    29  	bytes, err := yaml.Marshal(u)
    30  	if err != nil {
    31  		return nil, fmt.Errorf("error marshalling unstruct to yaml: %w", err)
    32  	}
    33  	return bytes, nil
    34  }
    35  
    36  func BytesToUnstruct(bytes []byte) (*unstructured.Unstructured, error) {
    37  	u := unstructured.Unstructured{}
    38  	if err := yaml.Unmarshal(bytes, &u); err != nil {
    39  		return nil, fmt.Errorf("error unmarshalling bytes to unstruct: %v", err)
    40  	}
    41  	return &u, nil
    42  }
    43  
    44  func ReadFileToUnstructs(filePath string) ([]*unstructured.Unstructured, error) {
    45  	var returnUnstructs []*unstructured.Unstructured
    46  	b, err := ioutil.ReadFile(filePath)
    47  	if err != nil {
    48  		return nil, err
    49  	}
    50  	yamls, err := SplitYAML(b)
    51  	if err != nil {
    52  		return nil, err
    53  	}
    54  	for _, b = range yamls {
    55  		u, err := BytesToUnstruct(b)
    56  		if err != nil {
    57  			return nil, err
    58  		}
    59  		returnUnstructs = append(returnUnstructs, u)
    60  	}
    61  	return returnUnstructs, nil
    62  }
    63  
    64  func SplitYAML(yamlBytes []byte) ([][]byte, error) {
    65  	r := bytes.NewReader(yamlBytes)
    66  	dec := goyaml.NewDecoder(r)
    67  	results := make([][]byte, 0)
    68  	var value map[string]interface{}
    69  	for eof := dec.Decode(&value); eof != io.EOF; eof = dec.Decode(&value) {
    70  		if eof != nil {
    71  			return nil, eof
    72  		}
    73  		bytes, err := goyaml.Marshal(value)
    74  		if err != nil {
    75  			return nil, fmt.Errorf("error marshalling '%v' to YAML: %v", value, err)
    76  		}
    77  		results = append(results, bytes)
    78  	}
    79  	return results, nil
    80  }
    81
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