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102 lines
2.0 KiB
102 lines
2.0 KiB
2 years ago
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package gojobs
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import (
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"context"
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"errors"
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"fmt"
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"go.dtapp.net/goip"
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"go.etcd.io/etcd/client/v3"
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"log"
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"time"
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)
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const (
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// JobWorkerDir 服务注册目录
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JobWorkerDir = "/cron/workers/"
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)
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// NewEtcdWorker 创建 etcd Worker
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func NewEtcdWorker(config *EtcdConfig) (e *Etcd, err error) {
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e.Endpoints = config.Endpoints
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e.DialTimeout = config.DialTimeout
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e.client, err = clientv3.New(clientv3.Config{
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Endpoints: e.Endpoints,
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DialTimeout: e.DialTimeout,
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})
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if err != nil {
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return nil, errors.New("连接失败:" + err.Error())
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}
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// 得到KV和Lease的API子集
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e.kv = clientv3.NewKV(e.client)
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e.lease = clientv3.NewLease(e.client)
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go e.RegisterWorker()
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return e, nil
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}
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// RegisterWorker 注册worker
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func (e Etcd) RegisterWorker() {
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var (
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regKey string
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leaseGrantResp *clientv3.LeaseGrantResponse
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err error
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keepAliveChan <-chan *clientv3.LeaseKeepAliveResponse
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keepAliveResp *clientv3.LeaseKeepAliveResponse
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cancelCtx context.Context
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cancelFunc context.CancelFunc
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)
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localIP := goip.GetOutsideIp()
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for {
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// 注册路径
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regKey = JobWorkerDir + localIP
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cancelFunc = nil
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// 创建租约
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leaseGrantResp, err = e.lease.Grant(context.TODO(), 10)
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if err != nil {
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log.Println("创建租约")
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goto RETRY
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}
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// 自动续租
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keepAliveChan, err = e.lease.KeepAlive(context.TODO(), leaseGrantResp.ID)
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if err != nil {
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log.Println("自动续租")
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goto RETRY
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}
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cancelCtx, cancelFunc = context.WithCancel(context.TODO())
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// 注册到etcd
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_, err = e.kv.Put(cancelCtx, regKey, "", clientv3.WithLease(leaseGrantResp.ID))
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if err != nil {
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log.Println(fmt.Sprintf(" %s 服务注册失败:%s", regKey, err))
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goto RETRY
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}
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// 处理续租应答
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for {
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select {
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case keepAliveResp = <-keepAliveChan:
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if keepAliveResp == nil { // 续租失败
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log.Println("续租失败")
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goto RETRY
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}
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}
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}
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RETRY:
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time.Sleep(1 * time.Second)
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if cancelFunc != nil {
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cancelFunc()
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}
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}
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}
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