36 lines
583 B
Go
36 lines
583 B
Go
package random
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import (
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"math"
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"math/rand"
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"time"
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)
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var (
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rnd *rand.Rand
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ch chan int64
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)
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func init() {
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rnd = rand.New(rand.NewSource(time.Now().UnixNano()))
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ch = make(chan int64, 1000)
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go randomBase(ch)
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}
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func randomBase(c chan int64) {
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for {
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c <- rnd.Int63()
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}
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}
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//Uniqid 随机数，length是需要返回的长度，只支持10~19位
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func Uniqid(length int) int64 {
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if length < 10 || length > 19 {
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return 0
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}
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prefix := (time.Now().UnixNano() / 100000000) & 0x3fffffff
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cut := int64(math.Pow10(length - 9))
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suffix := <-ch % cut
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return prefix*cut + suffix
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}
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