k8s中 csi driver 的identity server的probe方法怎么实现 请给出具体代码

CSI Driver 的 Identity Server Probe 方法是用于检测 CSI Driver Identity Server 是否已经正确安装并运行的组件。如果 Identity Server 没有正确安装或运行，则 CSI Probe 会尝试自动修复或报告错误。下面是一个简单的 CSI Driver Identity Server Probe 的示例代码：

package main

import (
	"context"
	"flag"
	"fmt"
	"os"
	"time"

	csi "github.com/container-storage-interface/spec/lib/go/csi/v0"
	"google.golang.org/grpc"
	"google.golang.org/grpc/connectivity"
)

const (
	DefaultTimeout = 30 * time.Second
)

var (
	endpoint = flag.String("csi-address", "", "CSI driver endpoint")
	timeout  = flag.Duration("timeout", DefaultTimeout, "Timeout for waiting for the CSI driver")
)

func main() {
	flag.Parse()

	if *endpoint == "" {
		fmt.Fprintf(os.Stderr, "CSI driver endpoint not specified\n")
		os.Exit(1)
	}

	ctx, cancel := context.WithTimeout(context.Background(), *timeout)
	defer cancel()

	err := probe(ctx, *endpoint)
	if err != nil {
		fmt.Fprintf(os.Stderr, "CSI driver identity server probe failed: %v\n", err)
		os.Exit(1)
	}

	fmt.Println("CSI driver identity server probe succeeded")
}

func probe(ctx context.Context, endpoint string) error {
	conn, err := grpc.Dial(endpoint, grpc.WithInsecure(), grpc.WithBlock())
	if err != nil {
		return fmt.Errorf("failed to connect to CSI driver identity server: %v", err)
	}
	defer conn.Close()

	client := csi.NewIdentityClient(conn)

	var state connectivity.State
	for {
		state = conn.GetState()
		if state == connectivity.Ready {
			break
		}
		if ctx.Err() != nil {
			return fmt.Errorf("timed out waiting for CSI driver identity server to become ready")
		}
		time.Sleep(1 * time.Second)
	}

	request := &csi.ProbeRequest{}

	response, err := client.Probe(ctx, request)
	if err != nil {
		if ctx.Err() == context.DeadlineExceeded {
			return fmt.Errorf("timed out waiting for CSI driver identity server to respond")
		}
		return fmt.Errorf("failed to run CSI driver identity server probe: %v", err)
	}

	if response.GetReady().GetValue() != true {
		return fmt.Errorf("invalid response from CSI driver identity server probe")
	}

	return nil
}

该示例代码使用 gRPC 连接到 CSI Driver 的 Identity Server，并发送一个 Probe 请求。在等待 Identity Server 准备好之前，它将等待连接变为 `connectivity.Ready` 状态。如果 Identity Server 没有正确安装或运行，则 CSI Probe 将返回一个错误。如果 Identity Server 响应 Probe 请求，则 CSI Probe 将检查响应并返回一个成功或失败的结果。