parse request id

reqid_time.go

package main

// run: go run % 3jgAAPjhC9FXslMT ZnkAANzksCImuUcT
// build: go build -o /usr/bin/qiniu-reqid %

import (
	"os"
	"time"
	"fmt"
	"log"
	"encoding/binary"
	"encoding/base64"
)

func main() {
	reqid := os.Args[1]
	buf, err := base64.URLEncoding.DecodeString(reqid)
	if err != nil { panic(err) }
	log.Println(buf, len(buf), len(reqid))
	timeStamp := binary.LittleEndian.Uint64(buf[4:])
	println(timeStamp)
	t := time.Unix(0, int64(timeStamp)).Round(time.Second)
	pid := binary.LittleEndian.Uint32(buf[:4])
	fmt.Println("pid:", pid, "time:", t)
}