这个就不多做说明拉,就是快速高效得生成随机字符串,当然,直接引用 repo 也可以,但是这么简单的事情,一个函数就可以搞定了:
// made by https://liqiang.io
var src = rand.NewSource(time.Now().UnixNano())
const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
const (
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 randString(n int) *string {
b := make([]byte, n)
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(letterBytes) {
b[i] = letterBytes[idx]
i--
}
cache >>= letterIdxBits
remain--
}
return (*string)(unsafe.Pointer(&b))
}
简单看一下:
// main.go made by https://liqiang.io
func main() {
fmt.Printf("rand string: %s\n", *randString(10))
}
结果很简单:
# go run main.go
rand string: VGeLolNnmL