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kubectl源码分析之rollout restart


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kubectl源码分析之rollout restart_权限控制

 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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type RestartOptions struct {//restart结构体
PrintFlags *genericclioptions.PrintFlags
ToPrinter func(string) (printers.ResourcePrinter, error)

Resources []string

Builder func() *resource.Builder
Restarter polymorphichelpers.ObjectRestarterFunc
Namespace string
EnforceNamespace bool

resource.FilenameOptions
genericclioptions.IOStreams
}

func NewRolloutRestartOptions(streams genericclioptions.IOStreams) *RestartOptions {
return &RestartOptions{//初始化结构体
PrintFlags: genericclioptions.NewPrintFlags("restarted").WithTypeSetter(scheme.Scheme),
IOStreams: streams,
}
}

//创建restart命令
func NewCmdRolloutRestart(f cmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
o := NewRolloutRestartOptions(streams)//初始化结构体

validArgs := []string{"deployment", "daemonset", "statefulset"}

cmd := &cobra.Command{//创建cobra命令
Use: "restart RESOURCE",
DisableFlagsInUseLine: true,
Short: i18n.T("Restart a resource"),
Long: restartLong,
Example: restartExample,
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(o.Complete(f, cmd, args))//准备
cmdutil.CheckErr(o.Validate())//校验
cmdutil.CheckErr(o.RunRestart())//运行
},
ValidArgs: validArgs,//有效参数
}

usage := "identifying the resource to get from a server."
cmdutil.AddFilenameOptionFlags(cmd, &o.FilenameOptions, usage)//文件选项
o.PrintFlags.AddFlags(cmd)//打印选项
return cmd
}

//准备函数
func (o *RestartOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
o.Resources = args//设置资源

o.Restarter = polymorphichelpers.ObjectRestarterFn//设置Restarter函数

var err error
o.Namespace, o.EnforceNamespace, err = f.ToRawKubeConfigLoader().Namespace()//设置namespace和enforceNamespace
if err != nil {
return err
}

o.ToPrinter = func(operation string) (printers.ResourcePrinter, error) {//print flag 转printer函数
o.PrintFlags.NamePrintFlags.Operation = operation
return o.PrintFlags.ToPrinter()
}

o.Builder = f.NewBuilder//设置builder

return nil
}

//校验
func (o *RestartOptions) Validate() error {
if len(o.Resources) == 0 && cmdutil.IsFilenameSliceEmpty(o.Filenames, o.Kustomize) {//资源和文件至少有一个
return fmt.Errorf("required resource not specified")
}
return nil
}

//运行
func (o RestartOptions) RunRestart() error {
r := o.Builder().
WithScheme(scheme.Scheme, scheme.Scheme.PrioritizedVersionsAllGroups()...).
NamespaceParam(o.Namespace).DefaultNamespace().
FilenameParam(o.EnforceNamespace, &o.FilenameOptions).
ResourceTypeOrNameArgs(true, o.Resources...).
ContinueOnError().
Latest().
Flatten().
Do()//构造result对象
if err := r.Err(); err != nil {
return err
}

allErrs := []error{}
infos, err := r.Infos()//获取info对象
if err != nil {
// restore previous command behavior where
// an error caused by retrieving infos due to
// at least a single broken object did not result
// in an immediate return, but rather an overall
// aggregation of errors.
allErrs = append(allErrs, err)
}

for _, patch := range set.CalculatePatches(infos, scheme.DefaultJSONEncoder(), set.PatchFn(o.Restarter)) {//计算info补丁,并遍历
info := patch.Info

if patch.Err != nil {//补丁有错误,append错误继续
resourceString := info.Mapping.Resource.Resource
if len(info.Mapping.Resource.Group) > 0 {
resourceString = resourceString + "." + info.Mapping.Resource.Group
}
allErrs = append(allErrs, fmt.Errorf("error: %s %q %v", resourceString, info.Name, patch.Err))
continue
}

if string(patch.Patch) == "{}" || len(patch.Patch) == 0 {//如果补丁为空,则append错误
allErrs = append(allErrs, fmt.Errorf("failed to create patch for %v: empty patch", info.Name))
}

obj, err := resource.NewHelper(info.Client, info.Mapping).Patch(info.Namespace, info.Name, types.StrategicMergePatchType, patch.Patch, nil)//用helper应用补丁到服务端
if err != nil {
allErrs = append(allErrs, fmt.Errorf("failed to patch: %v", err))
continue
}

info.Refresh(obj, true)//刷新obj对象
printer, err := o.ToPrinter("restarted")//printflag转printer
if err != nil {
allErrs = append(allErrs, err)
continue
}
if err = printer.PrintObj(info.Object, o.Out); err != nil {//打印结果
allErrs = append(allErrs, err)
}
}

return utilerrors.NewAggregate(allErrs)
}

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