main.go

package main

import (
	"context"
	"fmt"
	"sync"

	"google.golang.org/grpc"

	"github.com/coreos/etcd/clientv3"
)

func test(c *clientv3.Client, wg *sync.WaitGroup, i int) {
	defer wg.Done()
	ctx := context.TODO()

	role := fmt.Sprintf("test-role-%d", i)
	user := fmt.Sprintf("test-user-%d", i)

	_, err := c.RoleAdd(ctx, role)
	if err != nil {
		panic(err)
	}

	_, err = c.RoleGrantPermission(ctx, role, "", clientv3.GetPrefixRangeEnd(""), clientv3.PermissionType(clientv3.PermReadWrite))
	if err != nil {
		panic(err)
	}

	_, err = c.UserAdd(ctx, user, "123")
	if err != nil {
		panic(err)
	}

	//for _ = range time.Tick(time.Second) {
	key := "test-key"
	val := "testval"

	_, err = c.Txn(ctx).If(
		clientv3.Compare(clientv3.Value(key), "=", val),
	).Else(
		clientv3.OpPut(key, val),
	).Commit()

	if err != nil {
		panic(err)
	}
	//}

}

func main() {
	c, err := clientv3.New(clientv3.Config{
		Endpoints:   []string{"127.0.0.1:2379"},
		Username:    "root",
		Password:    "root",
		DialOptions: []grpc.DialOption{grpc.WithBlock()},
	})
	if err != nil {
		panic(err)
	}

	concurreny := 10
	wg := &sync.WaitGroup{}
	wg.Add(concurreny)
	for i := 0; i < concurreny; i++ {
		go test(c, wg, i)
	}

	wg.Wait()
}