Generate Random String in Go

generate_random_string.go

//
// Do Use This the generated string is not very random at all
//
package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
  src := rand.NewSource(time.Now().UTC().UnixNano())
  fmt.Println(RandStringBytesMaskImprSrc(src,10))
}

const (
	chars         = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
	letterIdxBits = 6                    // 6 bits to represent a letter index
	letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
	letterIdxMax  = 63 / letterIdxBits   // # of letter indices fitting in 63 bits
)

func RandStringBytesMaskImprSrc(src rand.Source, n int) string {
	b := make([]byte, n)
	// A src.Int63() generates 63 random bits, enough for letterIdxMax characters!
	for i, cache, remain := n-1, src.Int63(), letterIdxMax; i >= 0; {
		if remain == 0 {
			cache, remain = src.Int63(), letterIdxMax
		}
		if idx := int(cache & letterIdxMask); idx < len(chars) {
			b[i] = chars[idx]
			i--
		}
		cache >>= letterIdxBits
		remain--
	}

	return string(b)
}

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