package snowflake
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import (
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"apsClient/pkg/logx"
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"errors"
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"fmt"
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"hash/fnv"
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"net"
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"strconv"
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"sync"
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"time"
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)
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var idGenerater *IdWorker
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func init() {
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// 使用 LookupIP 获取主机的 IP 地址列表
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// 获取本机所有网络接口
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interfaces, err := net.Interfaces()
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if err != nil {
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logx.Errorf("snowflake InitWithIP error:%v", err)
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return
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}
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var ip string
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// 遍历所有网络接口
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for _, iface := range interfaces {
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// 排除一些特殊的接口，例如 loopback 接口
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if iface.Flags&net.FlagUp != 0 && iface.Flags&net.FlagLoopback == 0 {
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// 获取接口的所有地址
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addrs, err := iface.Addrs()
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if err != nil {
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logx.Errorf("snowflake InitWithIP error:%v", err)
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continue
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}
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// 遍历接口的所有地址
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for _, addr := range addrs {
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// 检查地址类型是否是 IP 地址
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if ipNet, ok := addr.(*net.IPNet); ok && !ipNet.IP.IsLoopback() {
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// 判断 IP 地址的版本是 IPv4 还是 IPv6
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if ipNet.IP.To4() != nil {
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fmt.Printf("IPv4 Address: %s\n", ipNet.IP.String())
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if ipNet.IP.String() != "127.0.0.1" {
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ip = ipNet.IP.String()
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goto getIpOK
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}
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} else {
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fmt.Printf("IPv6 Address: %s\n", ipNet.IP.String())
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}
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}
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}
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}
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}
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getIpOK:
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if ip == "" {
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logx.Errorf("snowflake InitWithIP can not find Ip")
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return
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}
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ipNumber, err := ipToNumber(ip)
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if err != nil {
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logx.Errorf("snowflake can not generate, init error, ip to number error :%v", err)
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panic(fmt.Sprintf("snowflake can not generate, init error, ip to number error :%v", err))
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}
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idGenerater, err = NewIdWorker(ipNumber)
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if err != nil {
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logx.Errorf("snowflake can not generate, init error :%v", err)
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panic(fmt.Sprintf("snowflake can not generate, init error :%v", err))
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}
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}
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func ipToNumber(ip string) (int64, error) {
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// 将 IP 地址字符串解析为 net.IP 类型
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parsedIP := net.ParseIP(ip)
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if parsedIP == nil {
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return 0, fmt.Errorf("invalid IP address:%v", ip)
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}
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// 使用 FNV-1a 散列算法计算哈希值
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hash := fnv.New32a()
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hash.Write(parsedIP)
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return int64(hash.Sum32() % 1024), nil // 取余数确保结果在 1 到 1023 之间
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}
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const (
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CEpoch = 1474802888000
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CWorkerIdBits = 10 // Num of WorkerId Bits
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CSenquenceBits = 12 // Num of Sequence Bits
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CWorkerIdShift = 12
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CTimeStampShift = 22
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CSequenceMask = 0xfff // equal as getSequenceMask()
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CMaxWorker = 0x3ff // equal as getMaxWorkerId()
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)
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type IdWorker struct {
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workerId int64
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lastTimeStamp int64
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sequence int64
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maxWorkerId int64
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lock *sync.Mutex
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}
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func NewIdWorker(workerId int64) (iw *IdWorker, err error) {
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iw = new(IdWorker)
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iw.maxWorkerId = getMaxWorkerId()
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if workerId > iw.maxWorkerId || workerId < 0 {
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return nil, errors.New("worker not fit")
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}
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iw.workerId = workerId
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iw.lastTimeStamp = -1
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iw.sequence = 0
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iw.lock = new(sync.Mutex)
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return iw, nil
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}
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func getMaxWorkerId() int64 {
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return -1 ^ -1<<CWorkerIdBits
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}
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func getSequenceMask() int64 {
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return -1 ^ -1<<CSenquenceBits
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}
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// return in ms
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func (iw *IdWorker) timeGen() int64 {
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return time.Now().UnixNano() / 1000 / 1000
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}
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func (iw *IdWorker) timeReGen(last int64) int64 {
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ts := time.Now().UnixNano() / 1000 / 1000
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for {
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if ts <= last {
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ts = iw.timeGen()
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} else {
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break
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}
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}
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return ts
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}
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func (iw *IdWorker) NextId() (ts int64, err error) {
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iw.lock.Lock()
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defer iw.lock.Unlock()
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ts = iw.timeGen()
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if ts == iw.lastTimeStamp {
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iw.sequence = (iw.sequence + 1) & CSequenceMask
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if iw.sequence == 0 {
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ts = iw.timeReGen(ts)
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}
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} else {
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iw.sequence = 0
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}
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if ts < iw.lastTimeStamp {
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err = errors.New("Clock moved backwards, Refuse gen id")
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return 0, err
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}
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iw.lastTimeStamp = ts
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ts = (ts-CEpoch)<<CTimeStampShift | iw.workerId<<CWorkerIdShift | iw.sequence
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return ts, nil
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}
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func ParseId(id int64) (t time.Time, ts int64, workerId int64, seq int64) {
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seq = id & CSequenceMask
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workerId = (id >> CWorkerIdShift) & CMaxWorker
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ts = (id >> CTimeStampShift) + CEpoch
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t = time.Unix(ts/1000, (ts%1000)*1000000)
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return
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}
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func GenerateID() int64 {
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start:
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id, err := idGenerater.NextId()
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if err != nil {
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goto start
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}
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return id
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}
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func GenerateIdStr() string {
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start:
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id, err := idGenerater.NextId()
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if err != nil {
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goto start
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}
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return strconv.FormatInt(id, 10)
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}
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