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lead.go
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lead.go
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package efind
import (
"context"
"go.etcd.io/etcd/client/v3/concurrency"
"log"
)
type Election struct {
ele *concurrency.Election
//选举的目标(参与哪场选举)
eleName string
//选举的值(就是val)
eleVal string
}
type NodeInfo struct {
Name string
//LeaderVal
Value string
}
// NewElect 返回一个Election对象,但进行任何操作
func (es *ESession) NewElect(eleName, val string) (ele *Election) {
election := concurrency.NewElection(es.session, eleName)
ele = new(Election)
ele.eleName = eleName
ele.eleVal = val
ele.ele = election
return
}
// Campaign 表示开始从事竞选活动
func (ele *Election) Campaign() (err error) {
log.Println("节点正在竞选", ele.Info())
err = ele.ele.Campaign(context.TODO(), ele.eleVal)
if err != nil {
log.Panicln("参与选举失败")
return err
}
log.Println("选举成功!", ele.Info())
return nil
}
// Info 返回当前节点的信息
func (ele *Election) Info() *NodeInfo {
nodeInfo := new(NodeInfo)
nodeInfo.Name = ele.eleName
nodeInfo.Value = ele.eleVal
return nodeInfo
}
// ReturnLeader 返回当前选举目标,的领导人
func (ele *Election) ReturnLeader() (l *NodeInfo) {
leader, err := ele.ele.Leader(context.TODO())
if err != nil {
return nil
}
l = new(NodeInfo)
//fmt.Println(len(leader.Kvs))
//fmt.Println(leader.Kvs)
l.Name = string(leader.Kvs[0].Key)
l.Value = string(leader.Kvs[0].Value)
return
}
// LogReturnLeader 若领导人改变,log一下
func (ele *Election) LogReturnLeader() {
observe := ele.ele.Observe(context.TODO())
for {
select {
case leader := <-observe:
log.Println("新的leader:", leader.Kvs[0])
}
}
}