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HomeBackend DevelopmentGolangHow to return custom user-friendly error messages in Kubernetes?

如何在 Kubernetes 中返回自定义的用户友好错误消息?

在 Kubernetes 中,当出现错误时,默认返回的错误消息通常是技术性的、难以理解的,对于普通用户来说并不友好。然而,通过一些简单的配置和自定义操作,我们可以在 Kubernetes 中返回自定义的用户友好错误消息。在本文中,php小编小新将为您介绍如何实现这一功能,使得用户能够更好地理解和处理错误。

问题内容

我有一个与 k8s 对话的 golang 后端。我想重新表述从 k8s 获得的错误响应并将其发送到前端。

我想为用户返回有意义的验证错误消息,当他添加无效名称时,某些内容已经存在......

我想要一些通用的东西,而不是在每个端点的控制器中硬编码。

我正在使用 kubernetes/client-go

  1. 第一个错误

例如,假设我想向 etcd 添加一家酒店,当我尝试添加酒店名称:hotel123 时,该酒店已经存在。

  • 我收到此错误消息:\"hotel123\" 已存在
  • 我想要的:hotel123已经存在
  1. 第二个错误

例如,假设我想向 etcd 添加一家酒店,当我尝试添加酒店名称:hotel_123 时,该酒店已经存在。

  • 我收到此错误消息:\"hotel_123\" 无效,无效值:\"hotel_123\"...
  • 我想要什么:hotel_123 无效

如何返回自定义用户友好的错误消息?

PS:我有多个函数,因此验证应该是通用的。

解决方法

一般来说(尽管有解决方法),如果您想捕获错误以便返回更有用的错误,则需要确保满足以下条件:

  1. 您捕获的错误有一个 有意义的类型
  2. 您使用的是 go 版本 >= 1.13,该版本附带有用的辅助函数

在下面的示例中,我尝试读取不存在的配置文件。我的代码检查返回的错误是否为 fs.patherror ,然后抛出它自己的更有用的错误。您可以将这个总体想法扩展到您的用例中。

package main

import (
    "errors"
    "fmt"
    "io/fs"

    "k8s.io/client-go/tools/clientcmd"
)

func main() {

    var myerror error
    config, originalerror := clientcmd.buildconfigfromflags("", "/some/path/that/doesnt/exist")
    if originalerror != nil {

        var patherror *fs.patherror

        switch {
        case errors.as(originalerror, &patherror):

            myerror = fmt.errorf("there is no config file at %s", originalerror.(*fs.patherror).path)

        default:

            myerror = fmt.errorf("there was an error and it's type was %t", originalerror)

        }

        fmt.printf("%#v", myerror)

    } else {

        fmt.println("there was no error")
        fmt.println(config)

    }

}

在调试中,您会发现 %t 格式化程序有用

对于您的特定用例,您可以使用正则表达式来解析所需的文本。

下面的正则表达式表示:

  1. ^\w* 以任何非字母数字字符开头
  2. (\w+) 捕获后面的字母数字字符串
  3. \w*\s? 匹配非字母数字字符
  4. (is\sinvalid) 捕获“无效”
func MyError(inError error) error {
    pattern, _ := regexp.Compile(`^\W*(\w+)\W*\s?(is\sinvalid)(.*)$`)
    myErrorString := pattern.ReplaceAll([]byte(inError.Error()), []byte("$1 $2"))
    return errors.New(string(myErrorString))
}

正如在这个操场上看到的:

https://www.php.cn/link/4ceefb51ae9ec399a69540c895f4519f

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