You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sockaddr.go
    path of file: ./repos/teller/vendor/github.com/hashicorp/go-sockaddr
    
    the code of the file until where you have to start completion: package sockaddr

import (
	"encoding/json"
	"fmt"
	"strings"
)

type SockAddrType int
type AttrName string

const (
	TypeUnknown SockAddrType = 0x0
	TypeUnix                 = 0x1
	TypeIPv
    
func (s *SockAddrMarshaler) UnmarshalJSON(in []byte) error {
	var str string
	err := json.Unmarshal(in, &str)
	if err != nil {
		return err
	}
	sa, err := NewSockAddr(str)
	if err != nil {
		return err
	}
	s.SockAddr = sa
	return nil
}