kubectl源码分析之create cronjob

野性酷女 2023-03-14 13:30 180阅读 0赞

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![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAaHhwamF2YTE_size_8_color_FFFFFF_t_70_g_se_x_16][]

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 CreateCronJobOptions struct {//create cronjob结构体
    	PrintFlags *genericclioptions.PrintFlags
    
    	PrintObj func(obj runtime.Object) error
    
    	Name     string
    	Image    string
    	Schedule string
    	Command  []string
    	Restart  string
    
    	Namespace string
    	Client    batchv1beta1client.BatchV1beta1Interface
    	DryRun    bool
    	Builder   *resource.Builder
    	Cmd       *cobra.Command
    
    	genericclioptions.IOStreams
    }

func NewCreateCronJobOptions(ioStreams genericclioptions.IOStreams) *CreateCronJobOptions {
    	return &CreateCronJobOptions{//初始化结构体
    		PrintFlags: genericclioptions.NewPrintFlags("created").WithTypeSetter(scheme.Scheme),
    		IOStreams:  ioStreams,
    	}
    }

//创建create cronjob 命令
    func NewCmdCreateCronJob(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
    	o := NewCreateCronJobOptions(ioStreams)//初始化结构体
    	cmd := &cobra.Command{//创建cobra命令
    		Use:     "cronjob NAME --image=image --schedule='0/5 * * * ?' -- [COMMAND] [args...]",
    		Aliases: []string{"cj"},
    		Short:   cronjobLong,
    		Long:    cronjobLong,
    		Example: cronjobExample,
    		Run: func(cmd *cobra.Command, args []string) {
    			cmdutil.CheckErr(o.Complete(f, cmd, args))//准备运行
    			cmdutil.CheckErr(o.Validate())//校验
    			cmdutil.CheckErr(o.Run())//运行
    		},
    	}
    
    	o.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.AddDryRunFlag(cmd)//设置dry-run选项
    	cmd.Flags().StringVar(&o.Image, "image", o.Image, "Image name to run.")//设置image选项
    	cmd.Flags().StringVar(&o.Schedule, "schedule", o.Schedule, "A schedule in the Cron format the job should be run with.")//设置schedule选项
    	cmd.Flags().StringVar(&o.Restart, "restart", o.Restart, "job's restart policy. supported values: OnFailure, Never")//设置restart选项
    
    	return cmd
    }

//准备方法
    func (o *CreateCronJobOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
    	name, err := NameFromCommandArgs(cmd, args)//获取名称
    	if err != nil {
    		return err
    	}
    	o.Name = name//设置名称
    	if len(args) > 1 {
    		o.Command = args[1:]//设置command
    	}
    	if len(o.Restart) == 0 {
    		o.Restart = "OnFailure"//如果restart为空，则restart为OnFailure
    	}
    
    	clientConfig, err := f.ToRESTConfig()//获取restconfig
    	if err != nil {
    		return err
    	}
    	o.Client, err = batchv1beta1client.NewForConfig(clientConfig)//设置client
    	if err != nil {
    		return err
    	}
    
    	o.Namespace, _, err = f.ToRawKubeConfigLoader().Namespace()//设置namesapce
    	if err != nil {
    		return err
    	}
    	o.Builder = f.NewBuilder()//设置Builder
    	o.Cmd = cmd
    
    	o.DryRun = cmdutil.GetDryRunFlag(cmd)//设置dry-run
    	if o.DryRun {
    		o.PrintFlags.Complete("%s (dry run)")
    	}
    	printer, err := o.PrintFlags.ToPrinter()//print flag转printer
    	if err != nil {
    		return err
    	}
    	o.PrintObj = func(obj runtime.Object) error {//设置printObj函数
    		return printer.PrintObj(obj, o.Out)
    	}
    
    	return nil
    }

//校验
    func (o *CreateCronJobOptions) Validate() error {
    	if len(o.Image) == 0 {//image不能为空
    		return fmt.Errorf("--image must be specified")
    	}
    	if len(o.Schedule) == 0 {//schedule不能为空
    		return fmt.Errorf("--schedule must be specified")
    	}
    	return nil
    }

//运行
    func (o *CreateCronJobOptions) Run() error {
    	var cronjob *batchv1beta1.CronJob
    	cronjob = o.createCronJob()//创建Cronjob对象
    
    	if !o.DryRun {
    		var err error
    		cronjob, err = o.Client.CronJobs(o.Namespace).Create(cronjob)//通过client创建cronjob
    		if err != nil {
    			return fmt.Errorf("failed to create cronjob: %v", err)
    		}
    	}
    
    	return o.PrintObj(cronjob)//打印结果
    }
    
    func (o *CreateCronJobOptions) createCronJob() *batchv1beta1.CronJob {
    	return &batchv1beta1.CronJob{//创建cronjob对象并赋值属性
    		TypeMeta: metav1.TypeMeta{APIVersion: batchv1beta1.SchemeGroupVersion.String(), Kind: "CronJob"},
    		ObjectMeta: metav1.ObjectMeta{
    			Name: o.Name,
    		},
    		Spec: batchv1beta1.CronJobSpec{
    			Schedule: o.Schedule,
    			JobTemplate: batchv1beta1.JobTemplateSpec{
    				ObjectMeta: metav1.ObjectMeta{
    					Name: o.Name,
    				},
    				Spec: batchv1.JobSpec{
    					Template: corev1.PodTemplateSpec{
    						Spec: corev1.PodSpec{
    							Containers: []corev1.Container{
    								{
    									Name:    o.Name,
    									Image:   o.Image,
    									Command: o.Command,
    								},
    							},
    							RestartPolicy: corev1.RestartPolicy(o.Restart),
    						},
    					},
    				},
    			},
    		},
    	}
    }

[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAaHhwamF2YTE_size_8_color_FFFFFF_t_70_g_se_x_16]: /images/20230312/7ea05ab76aee44d588799672fd39a52f.png
[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