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unique_id.go
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/
unique_id.go
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package app
import (
"context"
"fmt"
"log"
"strconv"
"sync"
"github.com/bwmarrin/snowflake"
clientv3 "go.etcd.io/etcd/client/v3"
)
type UniqueID struct {
NodeID int64
node *snowflake.Node
}
var (
client *UniqueID
once sync.Once
)
const (
maxNodes = 1024
)
func NewUniqueID(p Conf) *UniqueID {
once.Do(func() {
client = &UniqueID{
NodeID: getNodeID(p),
}
snowflake.Epoch = 1713369600000 //2024-04-18 00:00:00 GMT+8
node, err := snowflake.NewNode(client.NodeID)
if err != nil {
log.Panicln(err)
}
client.node = node
})
return client
}
func (u *UniqueID) GetID() int64 {
return u.node.Generate().Int64()
}
func getNodeID(p Conf) int64 {
// single node default 0
if p.EtcdAddress == "" {
return 0
}
cli, err := clientv3.NewFromURL(p.EtcdAddress)
if err != nil {
log.Panicln(err)
}
etcdKeyPrefix := p.AppName + "/nodes"
nodesResp := checkAndGetNodes(cli, etcdKeyPrefix)
lease, leaseID := getLeaseID(cli)
existNodeMap := make(map[int]int)
for _, ev := range nodesResp.Kvs {
num, _ := strconv.Atoi(string(ev.Value))
existNodeMap[num] = num
}
i := 0
for ; i < maxNodes; i++ {
if _, ok := existNodeMap[i]; !ok {
key := etcdKeyPrefix + "/" + strconv.Itoa(i)
txnResp, err := cli.Txn(context.Background()).
If(clientv3.Compare(clientv3.LeaseValue(key), "=", clientv3.NoLease)).
Then(clientv3.OpPut(key, strconv.Itoa(i), clientv3.WithLease(leaseID))).
Commit()
if err != nil {
log.Panicln(err)
}
if txnResp.Succeeded {
break
}
}
}
if i == maxNodes {
log.Panicln("Machine ID has reached the limit")
}
leaseKeepAlive(lease, leaseID)
return int64(i)
}
func checkAndGetNodes(cli *clientv3.Client, etcdKeyPrefix string) *clientv3.GetResponse {
resp, err := cli.Get(context.Background(), etcdKeyPrefix, clientv3.WithPrefix())
if err != nil {
log.Panicln(err)
}
if len(resp.Kvs) >= maxNodes {
log.Panicln("Machine ID has reached the limit")
}
return resp
}
func getLeaseID(cli *clientv3.Client) (clientv3.Lease, clientv3.LeaseID) {
lease := clientv3.NewLease(cli)
leaseGrantResp, err := lease.Grant(context.TODO(), _ttl)
if err != nil {
log.Panicln(err)
}
return lease, leaseGrantResp.ID
}
func leaseKeepAlive(lease clientv3.Lease, leaseID clientv3.LeaseID) {
leaseRespChan, err := lease.KeepAlive(context.TODO(), leaseID)
if err != nil {
log.Panicf("lease failed:%s\n", err.Error())
}
go func() {
for {
leaseKeepResp := <-leaseRespChan
if leaseKeepResp == nil {
fmt.Printf("lease closed\n")
return
}
}
}()
}