kubectl源码分析之rollout restart

迈不过友情╰ 2023-02-15 12:39 45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_50]

[istio多集群链路追踪，附实操视频][istio]

[istio防故障利器，你知道几个,istio新手不要读，太难！][istio_istio]

[istio业务权限控制，原来可以这么玩][istio 1]

[istio实现非侵入压缩，微服务之间如何实现压缩][istio 2]

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

[不懂envoyfilter也敢说精通istio系列-02-http-corsFilter-不要只会vs][envoyfilter_istio_-02-http-corsFilter-_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][envoyfilter_istio_-03-http-csrf filter-_csrf]

[不懂envoyfilter也敢说精通istio系列http-jwt\_authn-不要只会RequestAuthorization][envoyfilter_istio_http-jwt_authn-_RequestAuthorization]

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

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

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

[不懂envoyfilter也敢说精通istio系列-08-连接池和断路器][envoyfilter_istio_-08-]

[不懂envoyfilter也敢说精通istio系列-09-http-route filter][envoyfilter_istio_-09-http-route filter]

[不懂envoyfilter也敢说精通istio系列-network filter-redis proxy][envoyfilter_istio_-network filter-redis proxy]

[不懂envoyfilter也敢说精通istio系列-network filter-HttpConnectionManager][envoyfilter_istio_-network filter-HttpConnectionManager]

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

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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)
    }

[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAaHhwamF2YTE_size_8_color_FFFFFF_t_70_g_se_x_16]: https://img-blog.csdnimg.cn/20211007094240106.jpg?x-oss-process=image/watermark,type_ZHJvaWRzYW5zZmFsbGJhY2s,shadow_50,text_Q1NETiBAaHhwamF2YTE=,size_8,color_FFFFFF,t_70,g_se,x_16
[istio_50]: https://mp.weixin.qq.com/s/_OPMjmWCDSTlmbAxytg33A
[istio]: https://mp.weixin.qq.com/s/kjvtno_UzJAGr1joxm3tvw
[istio_istio]: https://mp.weixin.qq.com/s/e2-p_NY31Mc5y07S4Bb1JQ
[istio 1]: https://mp.weixin.qq.com/s/iTV0SCQLhSOTYncp3PxoHQ
[istio 2]: https://mp.weixin.qq.com/s/eINlrT242RlAwfuZu1_PcA
[envoyfilter_istio_-http-rbac-_AuthorizationPolicy]: https://mp.weixin.qq.com/s/Q-yTGBNqkjOov49LTXPrPA
[envoyfilter_istio_-02-http-corsFilter-_vs]: https://mp.weixin.qq.com/s/bFMdrT7OKSqoWv8pDXOIqQ
[envoyfilter_istio_-03-http-csrf filter-_csrf]: https://mp.weixin.qq.com/s/dlG9phV-kMMxs4UPzuRNYg
[envoyfilter_istio_http-jwt_authn-_RequestAuthorization]: https://mp.weixin.qq.com/s/IfrJ-FdLYsdhPkDrcO_YXA
[envoyfilter_istio_-05-fault-filter-_vs]: https://mp.weixin.qq.com/s/a4gDXqD8uswgglMwkUph2Q
[envoyfilter_istio_-06-http-match-_vs]: https://mp.weixin.qq.com/s/TpS3DHdcaJiPivIS_jsIGw
[envoyfilter_istio_-07-_dr]: https://mp.weixin.qq.com/s/k-zJm7n7OOKg6MotQJYPAA
[envoyfilter_istio_-08-]: https://mp.weixin.qq.com/s/n_bJ3saNeTtXRprIymhwzg
[envoyfilter_istio_-09-http-route filter]: https://mp.weixin.qq.com/s/JAeZr0BMVQxIrB3S_7Ru0A
[envoyfilter_istio_-network filter-redis proxy]: https://mp.weixin.qq.com/s/B9IPTI8F3q42nVkqbQRlPw
[envoyfilter_istio_-network filter-HttpConnectionManager]: https://mp.weixin.qq.com/s/W3OPQWkCVvuHGS49cTNhlg
[envoyfilter_istio_-ratelimit-istio ratelimit]: https://mp.weixin.qq.com/s/KgiDsELNol27mgZvDbFsqw
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2h4cGphdmEx_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200524125723190.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2h4cGphdmEx,size_16,color_FFFFFF,t_70