kubectl源码分析之create poddisruptionbudget

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 目前刚开始写一个月，一共写了18篇原创文章，文章目录如下：

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istio防故障利器，你知道几个,istio新手不要读，太难！

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不懂envoyfilter也敢说精通istio系列-http-rbac-不要只会用AuthorizationPolicy配置权限

不懂envoyfilter也敢说精通istio系列-02-http-corsFilter-不要只会vs

不懂envoyfilter也敢说精通istio系列-03-http-csrf filter-再也不用再代码里写csrf逻辑了

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不懂envoyfilter也敢说精通istio系列-05-fault-filter-故障注入不止是vs

不懂envoyfilter也敢说精通istio系列-06-http-match-配置路由不只是vs

不懂envoyfilter也敢说精通istio系列-07-负载均衡配置不止是dr

不懂envoyfilter也敢说精通istio系列-08-连接池和断路器

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不懂envoyfilter也敢说精通istio系列-ratelimit-istio ratelimit完全手册

 

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type PodDisruptionBudgetOpts struct {//pdb结构体
	CreateSubcommandOptions *CreateSubcommandOptions
}

//创建pdb命令
func NewCmdCreatePodDisruptionBudget(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
	options := &PodDisruptionBudgetOpts{//初始化pdb结构体
		CreateSubcommandOptions: NewCreateSubcommandOptions(ioStreams),
	}

	cmd := &cobra.Command{//创建cobra命令
		Use:                   "poddisruptionbudget NAME --selector=SELECTOR --min-available=N [--dry-run]",
		DisableFlagsInUseLine: true,
		Aliases:               []string{"pdb"},
		Short:                 i18n.T("Create a pod disruption budget with the specified name."),
		Long:                  pdbLong,
		Example:               pdbExample,
		Run: func(cmd *cobra.Command, args []string) {
			cmdutil.CheckErr(options.Complete(f, cmd, args))//准备运行
			cmdutil.CheckErr(options.Run())//运行
		},
	}

	options.CreateSubcommandOptions.PrintFlags.AddFlags(cmd)//设置print选项

	cmdutil.AddApplyAnnotationFlags(cmd)//设置save-config选项
	cmdutil.AddValidateFlags(cmd)//设置validate选项
	cmdutil.AddGeneratorFlags(cmd, generateversioned.PodDisruptionBudgetV2GeneratorName)//设置generator选项

	cmd.Flags().String("min-available", "", i18n.T("The minimum number or percentage of available pods this budget requires."))//设置min-available选项
	cmd.Flags().String("max-unavailable", "", i18n.T("The maximum number or percentage of unavailable pods this budget requires."))//设置max-unavailable选项
	cmd.Flags().String("selector", "", i18n.T("A label selector to use for this budget. Only equality-based selector requirements are supported."))//设置selector选项
	return cmd
}

//准备运行
func (o *PodDisruptionBudgetOpts) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
	name, err := NameFromCommandArgs(cmd, args)//获取资源名称
	if err != nil {
		return err
	}

	var generator generate.StructuredGenerator
	switch generatorName := cmdutil.GetFlagString(cmd, "generator"); generatorName {
	case generateversioned.PodDisruptionBudgetV1GeneratorName://获取generator名称并判断
		generator = &generateversioned.PodDisruptionBudgetV1Generator{//创建generator对象
			Name:         name,
			MinAvailable: cmdutil.GetFlagString(cmd, "min-available"),
			Selector:     cmdutil.GetFlagString(cmd, "selector"),
		}
	case generateversioned.PodDisruptionBudgetV2GeneratorName:
		generator = &generateversioned.PodDisruptionBudgetV2Generator{//创建generator对象
			Name:           name,
			MinAvailable:   cmdutil.GetFlagString(cmd, "min-available"),
			MaxUnavailable: cmdutil.GetFlagString(cmd, "max-unavailable"),
			Selector:       cmdutil.GetFlagString(cmd, "selector"),
		}
	default:
		return errUnsupportedGenerator(cmd, generatorName)
	}

	return o.CreateSubcommandOptions.Complete(f, cmd, args, generator)//运行createSubCommandOption的complete方法
}

// Run calls the CreateSubcommandOptions.Run in PodDisruptionBudgetOpts instance
func (o *PodDisruptionBudgetOpts) Run() error {//运行命令
	return o.CreateSubcommandOptions.Run()//运行createSubCommandOption的run方法
}