Golang雪花算法生成分布式唯一ID

工程结构

图片.png

main.go

package main

import (
    "fmt"
    "log"

    "github.com/zhuge20100104/laonanhai/snowflakedemo/sfnake"
)

func main() {
    sID, err := sfnake.SFlake.GetID()
    if err != nil {
        log.Fatalf("snow flake get id err: %v\n", err)
    }
    fmt.Printf("Get sid from snow flake: %v\n", sID)
}

sfnake.go

package sfnake

import (
    "github.com/sony/sonyflake"
)

var (
    SFlake *SnowFlake
)

// SnowFlake SnowFlake算法结构体
type SnowFlake struct {
    sFlake *sonyflake.Sonyflake
}

func init() {
    SFlake = NewSnowFlake()
}

// 模拟获取本机的机器ID
func getMachineID() (mID uint16, err error) {
    mID = 10
    return
}

func NewSnowFlake() *SnowFlake {
    st := sonyflake.Settings{}
    // machineID是个回调函数
    st.MachineID = getMachineID
    return &SnowFlake{
        sFlake: sonyflake.NewSonyflake(st),
    }
}

func (s *SnowFlake) GetID() (uint64, error) {
    return s.sFlake.NextID()
}

程序输出如下

图片.png