how to solve go mod issue of etcd

go.mod

module etcdmain

go 1.16

// cd $GOPATH
// git clone -b v3.5.0 https://github.com/etcd-io/etcd.git
// cd etcd
// pwd
// 如在go 代码文件中 引用包名为 `import go.etcd.io/etcd/client/v3`,则在mod文件需要增加replace的内容`go.etcd.io/etcd/client/v3 => $etcd绝对路径/client/v3`,这里`/Users/jialinwu/go12/etcd`为clone下来的etcd的绝对路径, 整体如下
//in go file `import go.etcd.io/etcd/client/v3`,then you need to edit go.mod and add `replace go.etcd.io/etcd/client/v3 => /Users/jialinwu/go12/etcd/client/v3`

replace (
	go.etcd.io/etcd/api/v3 => /Users/jialinwu/go12/etcd/api
	go.etcd.io/etcd/client/pkg/v3 => /Users/jialinwu/go12/etcd/client/pkg
	go.etcd.io/etcd/client/v2 => /Users/jialinwu/go12/etcd/client/v2
	go.etcd.io/etcd/client/v3 => /Users/jialinwu/go12/etcd/client/v3
	go.etcd.io/etcd/etcdctl/v3 => /Users/jialinwu/go12/etcd/etcdctl
	go.etcd.io/etcd/etcdutl/v3 => /Users/jialinwu/go12/etcd/etcdutl
	go.etcd.io/etcd/pkg/v3 => /Users/jialinwu/go12/etcd/pkg
	go.etcd.io/etcd/raft/v3 => /Users/jialinwu/go12/etcd/raft
	go.etcd.io/etcd/server/v3 => /Users/jialinwu/go12/etcd/server
)

require (
	github.com/linnv/logx v1.3.1
	go.etcd.io/etcd/client/v3 v3.5.0
	go.uber.org/multierr v1.7.0 // indirect
	golang.org/x/net v0.0.0-20210525063256-abc453219eb5 // indirect
	google.golang.org/grpc v1.38.0
	gopkg.in/yaml.v2 v2.4.0 // indirect
)

main.go

package main

import (
	"context"
	"fmt"
	"log"
	"os"
	"os/signal"
	"time"

	"github.com/linnv/logx"
	"google.golang.org/grpc"

	clientv3 "go.etcd.io/etcd/client/v3"
	"go.etcd.io/etcd/client/v3/concurrency"
)

func main() {
	go func() {

		es := []string{"https://192.168.1.216:2379", "https://192.168.1.204:2379", "https://192.168.1.203:2379"}
		config := clientv3.Config{
			Endpoints:   es,
			DialOptions: []grpc.DialOption{grpc.WithBlock()},
			DialTimeout: 10 * time.Second,
		}

		client, err := clientv3.New(config)
		if err != nil {
			log.Fatal(fmt.Sprintf("%s %s", err, es))
		} else {
			fmt.Println("connect success")
			defer client.Close()
		}

		logx.Debugf("start NewSession waiting for etcd to work\n")
		sess, err := concurrency.NewSession(client, concurrency.WithTTL(3))
		if err != nil {
			log.Fatal(err)
		}

		elec := concurrency.NewElection(sess, "eeee")

		startLeaderGet := time.Now()
		logx.Debugf("get leader")
		currentLeader1, err := elec.Leader(context.Background())
		logx.Debugf("[time usage]LeaderGet costs  %d millisecons actually %v\n", time.Since(startLeaderGet).Nanoseconds()/1000000, time.Since(startLeaderGet))
		logx.Debugf("currentLeader1: %+v\n", currentLeader1)
		logx.Debugf("err: %+v\n", err)
	}()
	sigChan := make(chan os.Signal, 2)
	signal.Notify(sigChan, os.Interrupt, os.Kill)
	log.Print("use c-c to exit: \n")
	<-sigChan
	os.Exit(0)
}