go encode sample

encode.go

package main

import (
	"encoding/base64"
	"fmt"
	"io"
	"io/ioutil"
	"log"
	"strings"
)

const Message = "44GC44GE44GG44GI44GK"


// エンコードのpipe版
//
// https://stackoverflow.com/questions/49135097/base64-encode-io-reader
func main()  {
        source := strings.NewReader("Hello, World!")
        pr, pw := io.Pipe()
        encoder := base64.NewEncoder(base64.StdEncoding, pw)
        go func() {
                _, err := io.Copy(encoder, source)
                encoder.Close()

                if err != nil {
                        pw.CloseWithError(err)
                } else {
                        pw.Close()
                }
        }()
        out, err := ioutil.ReadAll(pr)
        if err != nil {
                log.Fatal(err)
        }
        fmt.Println(string(out))
}