kubectl源码分析之rollout history

旧城等待， 2023-02-14 10:41 22阅读 0赞

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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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  1. //创建rollout命令
  2. func NewCmdRollout(f cmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
  3.     cmd := &cobra.Command{//创建cobra命令
  4.         Use:                   "rollout SUBCOMMAND",
  5.         DisableFlagsInUseLine: true,
  6.         Short:                 i18n.T("Manage the rollout of a resource"),
  7.         Long:                  rolloutLong,
  8.         Example:               rolloutExample,
  9.         Run:                   cmdutil.DefaultSubCommandRun(streams.Out),
  10.     }
  11.     // subcommands
  12.     cmd.AddCommand(NewCmdRolloutHistory(f, streams))//添加history命令
  13.     cmd.AddCommand(NewCmdRolloutPause(f, streams))//添加pause命令
  14.     cmd.AddCommand(NewCmdRolloutResume(f, streams))//添加resume命令
  15.     cmd.AddCommand(NewCmdRolloutUndo(f, streams))//添加undo命令
  16.     cmd.AddCommand(NewCmdRolloutStatus(f, streams))//添加status命令
  17.     cmd.AddCommand(NewCmdRolloutRestart(f, streams))//添加restart命令
  19.     return cmd
  20. }
  22. type RolloutHistoryOptions struct {//history结构体
  23.     PrintFlags *genericclioptions.PrintFlags
  24.     ToPrinter  func(string) (printers.ResourcePrinter, error)
  26.     Revision int64
  28.     Builder          func() *resource.Builder
  29.     Resources        []string
  30.     Namespace        string
  31.     EnforceNamespace bool
  33.     HistoryViewer    polymorphichelpers.HistoryViewerFunc
  34.     RESTClientGetter genericclioptions.RESTClientGetter
  36.     resource.FilenameOptions
  37.     genericclioptions.IOStreams
  38. }
  40. // NewRolloutHistoryOptions returns an initialized RolloutHistoryOptions instance
  41. func NewRolloutHistoryOptions(streams genericclioptions.IOStreams) *RolloutHistoryOptions {
  42.     return &RolloutHistoryOptions{//初始化history结构体
  43.         PrintFlags: genericclioptions.NewPrintFlags("").WithTypeSetter(scheme.Scheme),
  44.         IOStreams:  streams,
  45.     }
  46. }
  48. //创建history命令
  49. func NewCmdRolloutHistory(f cmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
  50.     o := NewRolloutHistoryOptions(streams)//初始化结构体
  52.     validArgs := []string{"deployment", "daemonset", "statefulset"}
  54.     cmd := &cobra.Command{//创建cobra命令
  55.         Use:                   "history (TYPE NAME | TYPE/NAME) [flags]",
  56.         DisableFlagsInUseLine: true,
  57.         Short:                 i18n.T("View rollout history"),
  58.         Long:                  historyLong,
  59.         Example:               historyExample,
  60.         Run: func(cmd *cobra.Command, args []string) {
  61.             cmdutil.CheckErr(o.Complete(f, cmd, args))//准备运行
  62.             cmdutil.CheckErr(o.Validate())//校验
  63.             cmdutil.CheckErr(o.Run())//运行
  64.         },
  65.         ValidArgs: validArgs,
  66.     }
  68.     cmd.Flags().Int64Var(&o.Revision, "revision", o.Revision, "See the details, including podTemplate of the revision specified")//创建revision选项
  70.     usage := "identifying the resource to get from a server."
  71.     cmdutil.AddFilenameOptionFlags(cmd, &o.FilenameOptions, usage)//文件选项
  73.     o.PrintFlags.AddFlags(cmd)//打印选项
  75.     return cmd
  76. }
  78. //准备
  79. func (o *RolloutHistoryOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
  80.     o.Resources = args//设置resources
  82.     var err error
  83.     if o.Namespace, o.EnforceNamespace, err = f.ToRawKubeConfigLoader().Namespace(); err != nil {//获取namespace和enforceNamespace
  84.         return err
  85.     }
  87.     o.ToPrinter = func(operation string) (printers.ResourcePrinter, error) {//printflag转printer函数
  88.         o.PrintFlags.NamePrintFlags.Operation = operation
  89.         return o.PrintFlags.ToPrinter()
  90.     }
  92.     o.HistoryViewer = polymorphichelpers.HistoryViewerFn//historyViewer函数
  93.     o.RESTClientGetter = f//RestClientGerrter
  94.     o.Builder = f.NewBuilder//设置builder
  96.     return nil
  97. }
  99. //校验
  100. func (o *RolloutHistoryOptions) Validate() error {
  101.     if len(o.Resources) == 0 && cmdutil.IsFilenameSliceEmpty(o.Filenames, o.Kustomize) {//资源和文件至少指定一个
  102.         return fmt.Errorf("required resource not specified")
  103.     }
  104.     if o.Revision < 0 {//revision必须大于0
  105.         return fmt.Errorf("revision must be a positive integer: %v", o.Revision)
  106.     }
  108.     return nil
  109. }
  111. //运行
  112. func (o *RolloutHistoryOptions) Run() error {
  114.     r := o.Builder().
  115.         WithScheme(scheme.Scheme, scheme.Scheme.PrioritizedVersionsAllGroups()...).
  116.         NamespaceParam(o.Namespace).DefaultNamespace().
  117.         FilenameParam(o.EnforceNamespace, &o.FilenameOptions).
  118.         ResourceTypeOrNameArgs(true, o.Resources...).
  119.         ContinueOnError().
  120.         Latest().
  121.         Flatten().
  122.         Do()//构造result对象
  123.     if err := r.Err(); err != nil {
  124.         return err
  125.     }
  127.     return r.Visit(func(info *resource.Info, err error) error {// visiter result遍历info对象
  128.         if err != nil {
  129.             return err
  130.         }
  132.         mapping := info.ResourceMapping()
  133.         historyViewer, err := o.HistoryViewer(o.RESTClientGetter, mapping)//获取HistoryViewer
  134.         if err != nil {
  135.             return err
  136.         }
  137.         historyInfo, err := historyViewer.ViewHistory(info.Namespace, info.Name, o.Revision)//获取历史信息
  138.         if err != nil {
  139.             return err
  140.         }
  142.         withRevision := ""
  143.         if o.Revision > 0 {
  144.             withRevision = fmt.Sprintf("with revision #%d", o.Revision)
  145.         }
  147.         printer, err := o.ToPrinter(fmt.Sprintf("%s\n%s", withRevision, historyInfo))//获取printer
  148.         if err != nil {
  149.             return err
  150.         }
  152.         return printer.PrintObj(info.Object, o.Out)//打印结果
  153.     })
  154. }

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