Go - JWT sign and verify

go_app.go

package main

import (
  "encoding/json"
  "io/ioutil"
  "github.com/golang-jwt/jwt"
  "strconv"
  "os"
  "time"
  "fmt"
)

func main() {
  file, _ := ioutil.ReadFile("/Users/mayankc/Work/source/perfComparisons/testdata/emails.json")
  var emails []string

  _ = json.Unmarshal([]byte(file), &emails)

  var i = 1
  var idx = 0
  var jwtSecret = []byte(os.Getenv("JWT_SECRET"))
  var numIterationsStr = os.Args[1]
  var numIterations, _ = strconv.Atoi(numIterationsStr)
  var startTS int64 = 0
  for {
    if i == 10000 {
      startTS = time.Now().UnixMilli()
    }
    email := emails[idx]
    currTS := time.Now().UnixMilli()
    token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
      "sub": email,
      "iat": currTS,
      "exp": currTS + 2 * 60 * 60 * 1000,
    })
    tokenString, _ := token.SignedString(jwtSecret)
    token2, _ := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
      return jwtSecret, nil
    })
    claims, _ := token2.Claims.(jwt.MapClaims);
    if claims["sub"] != email {
      os.Exit(1)
    }

    idx++
    if idx >= len(emails) {
      idx = 0
    }
    i++
    if i > numIterations {
      break
    }
  }
  var endTS = time.Now().UnixMilli()
  var diff = endTS - startTS

  fmt.Println(diff)
}