kubectl源码分析之create poddisruptionbudget

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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
}