/
resourceparser.go
102 lines (83 loc) · 2.59 KB
/
resourceparser.go
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package deployment
import (
"encoding/json"
"github.com/ghodss/yaml"
"github.com/pkg/errors"
"io/ioutil"
apiextv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
apiextv1beta1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/serializer"
clientgoscheme "k8s.io/client-go/kubernetes/scheme"
)
//go:generate mockery --name ResourceParser
// ResourceParser parses a resource from a given input.
type ResourceParser interface {
// ParseFile from a given path and return it.
ParseFile(path string) (*unstructured.Unstructured, error)
}
// GenericResourceParser is a default implementation of ResourceParser.
type GenericResourceParser struct{}
func (c *GenericResourceParser) ParseFile(path string) (obj *unstructured.Unstructured, err error) {
manifest, err := ioutil.ReadFile(path)
if err != nil {
return obj, err
}
return c.parseResourceFrom(string(manifest))
}
func (c *GenericResourceParser) parseResourceFrom(manifest string) (resource *unstructured.Unstructured, err error) {
decoder, err := initializeDefaultDecoder()
if err != nil {
return nil, errors.Wrap(err, "Could not initialize decoder.")
}
_, _, err = decoder.Decode([]byte(manifest), nil, nil)
if err != nil {
return nil, errors.Wrap(err, "Could not decode the resource file.")
}
converted, err := convertYamlToJson(manifest)
if err != nil {
return nil, errors.Wrap(err, "Could not convert the resource file to JSON")
}
resource, err = parseManifest([]byte(converted))
if err != nil {
return nil, errors.Wrap(err, "Could not parse the resource file.")
}
return resource, nil
}
func convertYamlToJson(input string) (string, error) {
convertedInput, err := yaml.YAMLToJSON([]byte(input))
if err != nil {
return "", err
}
if string(convertedInput) != "null" {
return string(convertedInput), nil
}
return "", err
}
func parseManifest(input []byte) (*unstructured.Unstructured, error) {
var middleware map[string]interface{}
err := json.Unmarshal(input, &middleware)
if err != nil {
return nil, err
}
resource := &unstructured.Unstructured{
Object: middleware,
}
return resource, nil
}
func initializeDefaultDecoder() (runtime.Decoder, error) {
sch := runtime.NewScheme()
err := clientgoscheme.AddToScheme(sch)
if err != nil {
return nil, err
}
err = apiextv1.AddToScheme(sch)
if err != nil {
return nil, err
}
if err := apiextv1beta1.AddToScheme(sch); err != nil {
return nil, err
}
return serializer.NewCodecFactory(sch).UniversalDeserializer(), nil
}