protopatch/conv.go.old at master · daishe/protopatch · GitHub

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package protopatch

import (
	"reflect"

	"google.golang.org/protobuf/encoding/protojson"
	"google.golang.org/protobuf/proto"
	"google.golang.org/protobuf/reflect/protoreflect"
)

func ConvertToMessageThroughWireEncoding(target protoreflect.Message, src protoreflect.Message) (protoreflect.Message, error) {
	if target.Descriptor() == src.Descriptor() {
		return src, nil
	}
	b, err := proto.Marshal(src.Interface())
	if err != nil {
		return nil, err
	}
	dst := target.New()
	err = proto.Unmarshal(b, dst.Interface())
	if err != nil {
		return nil, err
	}
	return dst, nil
}

func ConvertToMessageThroughJSON(target protoreflect.Message, src protoreflect.Message) (protoreflect.Message, error) {
	if target.Descriptor() == src.Descriptor() {
		return src, nil
	}
	b, err := protojson.Marshal(src.Interface())
	if err != nil {
		return nil, err
	}
	dst := target.New()
	err = protojson.Unmarshal(b, dst.Interface())
	if err != nil {
		return nil, err
	}
	return dst, nil
}

func ConvertToMessageFieldThroughJSON(parent protoreflect.Message, field protoreflect.FieldDescriptor, src protoreflect.Message) (protoreflect.Value, error) {
	if field.Message() == src.Descriptor() {
		return protoreflect.ValueOfMessage(src), nil
	}
	if reflect.TypeOf(parent.NewField(field).Interface()) == reflect.TypeOf(src.Interface()) {
		return protoreflect.ValueOfMessage(src), nil
	}
	b, err := protojson.Marshal(src.Interface())
	if err != nil {
		return protoreflect.Value{}, err
	}
	b = append(append([]byte(`{"`+field.JSONName()+`\":`), b...), '}')
	dst := parent.New()
	err = protojson.Unmarshal(b, dst.Interface())
	if err != nil {
		return protoreflect.Value{}, err
	}
	return dst.Mutable(field), nil
}