helm v3源码分析之总体

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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：

​​istio多集群探秘，部署了50次多集群后我得出的结论​​

​​istio多集群链路追踪，附实操视频​​

​​istio防故障利器，你知道几个,istio新手不要读，太难！​​

​​istio业务权限控制，原来可以这么玩​​

​​istio实现非侵入压缩，微服务之间如何实现压缩​​

​​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​​

​​不懂envoyfilter也敢说精通istio系列http-jwt_authn-不要只会RequestAuthorization​​

​​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​​

​​不懂envoyfilter也敢说精通istio系列-09-http-route filter​​

​​不懂envoyfilter也敢说精通istio系列-network filter-redis proxy​​

​​不懂envoyfilter也敢说精通istio系列-network filter-HttpConnectionManager​​

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

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func main() {//程序入口
  initKubeLogs()//初始化kube日志

  actionConfig := new(action.Configuration)
  cmd := newRootCmd(actionConfig, os.Stdout, os.Args[1:])//创建根命令

  if err := actionConfig.Init(settings.RESTClientGetter(), settings.Namespace(), os.Getenv("HELM_DRIVER"), debug); err != nil {//初始化
    log.Fatal(err)
  }

  if err := cmd.Execute(); err != nil {执行命令
    debug("%+v", err)
    switch e := err.(type) {
    case pluginError:
      os.Exit(e.code)
    default:
      os.Exit(1)
    }
  }
}

func newRootCmd(actionConfig *action.Configuration, out io.Writer, args []string) *cobra.Command {//获取根命令
  cmd := &cobra.Command{//创建cobra命令
    Use:                    "helm",
    Short:                  "The Helm package manager for Kubernetes.",
    Long:                   globalUsage,
    SilenceUsage:           true,
    Args:                   require.NoArgs,
    BashCompletionFunction: fmt.Sprintf("%s%s", contextCompFunc, completion.GetBashCustomFunction()),
  }
  flags := cmd.PersistentFlags()

  settings.AddFlags(flags)//添加选项

  flag := flags.Lookup("namespace")
  // Setup shell completion for the namespace flag
  completion.RegisterFlagCompletionFunc(flag, func(cmd *cobra.Command, args []string, toComplete string) ([]string, completion.BashCompDirective) {//自动补全
    if client, err := actionConfig.KubernetesClientSet(); err == nil {
      // Choose a long enough timeout that the user notices somethings is not working
      // but short enough that the user is not made to wait very long
      to := int64(3)
      completion.CompDebugln(fmt.Sprintf("About to call kube client for namespaces with timeout of: %d", to))

      nsNames := []string{}
      if namespaces, err := client.CoreV1().Namespaces().List(metav1.ListOptions{TimeoutSeconds: &to}); err == nil {
        for _, ns := range namespaces.Items {
          if strings.HasPrefix(ns.Name, toComplete) {
            nsNames = append(nsNames, ns.Name)
          }
        }
        return nsNames, completion.BashCompDirectiveNoFileComp
      }
    }
    return nil, completion.BashCompDirectiveDefault
  })

  // We can safely ignore any errors that flags.Parse encounters since
  // those errors will be caught later during the call to cmd.Execution.
  // This call is required to gather configuration information prior to
  // execution.
  flags.ParseErrorsWhitelist.UnknownFlags = true
  flags.Parse(args)

  // Add subcommands
  cmd.AddCommand(//添加子命令
    // chart commands
    newCreateCmd(out),// 添加create命令
    newDependencyCmd(out),// 添加dependency命令
    newPullCmd(out),//添加pull命令
    newShowCmd(out),//添加show命令
    newLintCmd(out),//添加lint命令
    newPackageCmd(out),//添加package命令
    newRepoCmd(out),//添加repo命令
    newSearchCmd(out),//添加search命令
    newVerifyCmd(out),//添加verify命令

    // release commands
    newGetCmd(actionConfig, out),//添加get命令
    newHistoryCmd(actionConfig, out),//添加history命令
    newInstallCmd(actionConfig, out),//添加install命令
    newListCmd(actionConfig, out),//添加list命令
    newReleaseTestCmd(actionConfig, out),//添加test命令
    newRollbackCmd(actionConfig, out),//添加rollback命令
    newStatusCmd(actionConfig, out),//添加status命令
    newTemplateCmd(actionConfig, out),//添加template命令
    newUninstallCmd(actionConfig, out),//添加uninstall命令
    newUpgradeCmd(actionConfig, out),//添加upgrade命令

    newCompletionCmd(out),//添加completion命令
    newEnvCmd(out),//添加env命令
    newPluginCmd(out),//添加plugin命令
    newVersionCmd(out),// 添加version命令

    // Hidden documentation generator command: 'helm docs'
    newDocsCmd(out),//添加docs命令

    // Setup the special hidden __complete command to allow for dynamic auto-completion
    completion.NewCompleteCmd(settings, out),
  )

  // Add annotation to flags for which we can generate completion choices
  for name, completion := range bashCompletionFlags {
    if cmd.Flag(name) != nil {
      if cmd.Flag(name).Annotations == nil {
        cmd.Flag(name).Annotations = map[string][]string{}
      }
      cmd.Flag(name).Annotations[cobra.BashCompCustom] = append(
        cmd.Flag(name).Annotations[cobra.BashCompCustom],
        completion,
      )
    }
  }

  // Add *experimental* subcommands
  registryClient, err := registry.NewClient(
    registry.ClientOptDebug(settings.Debug),
    registry.ClientOptWriter(out),
  )
  if err != nil {
    // TODO: don't panic here, refactor newRootCmd to return error
    panic(err)
  }
  actionConfig.RegistryClient = registryClient
  cmd.AddCommand(
    newRegistryCmd(actionConfig, out),//添加registry命令
    newChartCmd(actionConfig, out),//添加chart命令
  )

  // Find and add plugins
  loadPlugins(cmd, out)//加载插件

  return cmd
}