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Register.go
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Register.go
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package worker
import (
"context"
"github.com/coreos/etcd/clientv3"
"github.com/staryjie/crontab/common"
"net"
"time"
)
// 注册到etcd节点 /cron/works/{ip}
type Register struct {
client *clientv3.Client
kv clientv3.KV
lease clientv3.Lease
localIP string
}
var (
G_register *Register
)
// 获取本机IP
func getLocalIP() (ipv4 string, err error) {
var (
addrs []net.Addr
addr net.Addr
ipNet *net.IPNet // ip地址
isIpNet bool
)
// 获取所有网卡
if addrs, err = net.InterfaceAddrs(); err != nil {
return
}
// 获取第一个非lo网卡的IP
for _, addr = range addrs {
if ipNet, isIpNet = addr.(*net.IPNet); isIpNet && !ipNet.IP.IsLoopback() {
// 不考虑IPV6
if ipNet.IP.To4() != nil {
ipv4 = ipNet.IP.String()
return
}
}
}
err = common.ERR_NO_LOCAL_IP_FOUND
return
}
// 注册到Etcd并自动续租
func (register *Register) KeepOnLine() {
var (
regKey string
leaseGrantResp *clientv3.LeaseGrantResponse
keepAliveChan <-chan *clientv3.LeaseKeepAliveResponse
keepAliveResp *clientv3.LeaseKeepAliveResponse
canCtx context.Context
cancelFunc context.CancelFunc
err error
)
for {
// 注册路径
regKey = common.JOB_WORK_DIR + register.localIP
cancelFunc = nil
// 创建租约
if leaseGrantResp, err = register.lease.Grant(context.TODO(), common.REGISTER_WORKER_LEASE_TTL); err != nil {
goto RETRY
}
// 自动续约
if keepAliveChan, err = register.lease.KeepAlive(context.TODO(), leaseGrantResp.ID); err != nil {
goto RETRY
}
canCtx, cancelFunc = context.WithCancel(context.TODO())
// 注册到Etcd
if _, err = register.kv.Put(canCtx, regKey, "online", clientv3.WithLease(leaseGrantResp.ID)); err != nil {
goto RETRY
}
// 处理续租应答
for {
select {
case keepAliveResp = <-keepAliveChan:
if keepAliveResp == nil { // 续租失败
goto RETRY
}
}
}
RETRY:
time.Sleep(1 * time.Second)
if cancelFunc != nil {
cancelFunc()
}
}
}
func InitRegister() (err error) {
var (
config clientv3.Config
client *clientv3.Client
kv clientv3.KV
lease clientv3.Lease
localIP string
)
// 初始化配置
config = clientv3.Config{
Endpoints: G_config.EtcdEndpoints,
DialTimeout: time.Duration(G_config.EtcdDialTimeout) * time.Millisecond,
}
// 建立连接
if client, err = clientv3.New(config); err != nil {
return
}
// 获取本机IP
if localIP, err = getLocalIP(); err != nil {
return
}
// 获取kv和lease API子集
kv = clientv3.NewKV(client)
lease = clientv3.NewLease(client)
G_register = &Register{
client: client,
kv: kv,
lease: lease,
localIP: localIP,
}
// 服务注册
go G_register.KeepOnLine()
return
}