77 lines
2.0 KiB
Go
77 lines
2.0 KiB
Go
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package utility
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import (
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"github.com/rs/xid"
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"go.uber.org/zap"
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"fmt"
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"math"
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"math/rand"
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"time"
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log "github.com/go-admin-team/go-admin-core/logger"
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)
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// GetXid Package xid is a globally unique id generator library
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// 包xid是一个全局唯一的id生成器库
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func GetXid() string {
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return xid.New().String()
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}
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// GetGuid 获取guid 基于时间戳和MAC地址的uuid 可以视为随机字符串
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//func GetGuid() string {
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// return uuid.NewV1().String()
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//}
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//var orderLock sync.Mutex
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// GetOrderNo 获取订单id 看样子已经废弃 改用采用雪花算法获取了
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//func GetOrderNo() string {
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// orderLock.Lock()
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// defer orderLock.Unlock()
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// date := time.Now().Format("200601021504")
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// code := fmt.Sprintf("%s%07d", date, time.Now().Nanosecond()/100)
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// time.Sleep(30 * time.Millisecond)
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// return code
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//}
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// GetRandIntStr 生成len位的随机数字
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func GetRandIntStr(len int, prefix string) string {
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rand.Seed(time.Now().UnixNano())
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num := rand.Int31n(int32(math.Pow(10, float64(len))))
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x := fmt.Sprintf("%s%0*d", prefix, len, num)
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return x
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}
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// GenerateRandString 生成指定位数的字符串
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// 虽然繁琐 但理解之后就觉得很精妙
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func GenerateRandString(length int) string {
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var chars = []byte(`ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789`) // 长度:(1,256)
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rand.Seed(time.Now().UnixNano())
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clen := len(chars)
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maxRb := 255 - (256 % clen) // [-1,255] 255 - (256%36) = 251 避免模偏倚 为了每个字符被取到的几率相等
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b := make([]byte, length)
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r := make([]byte, length+(length/4)) // storage for random bytes. 存储随机字节
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for i := 0; ; {
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// 将随机的byte值填充到byte数组中 以供使用
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if _, err := rand.Read(r); err != nil {
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log.Error(`GenerateRandString`, zap.Error(err))
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return ``
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}
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for _, rb := range r {
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c := int(rb)
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if c > maxRb {
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// Skip this number to avoid modulo bias.跳过这个数字以避免模偏倚
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continue
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}
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b[i] = chars[c%clen]
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i++
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if i == length { // 直到取到合适的长度
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return string(b)
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}
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}
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}
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}
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