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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防故障利器，你知道几个,istio新手不要读，太难！
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 ReplaceOptions struct {//replace结构体
PrintFlags *genericclioptions.PrintFlags
RecordFlags *genericclioptions.RecordFlags
DeleteFlags *delete.DeleteFlags
DeleteOptions *delete.DeleteOptions
PrintObj func(obj runtime.Object) error
createAnnotation bool
validate bool
Schema validation.Schema
Builder func() *resource.Builder
BuilderArgs []string
Namespace string
EnforceNamespace bool
Raw string
Recorder genericclioptions.Recorder
genericclioptions.IOStreams
}func NewReplaceOptions(streams genericclioptions.IOStreams) *ReplaceOptions {
return &ReplaceOptions{//初始化结构体
PrintFlags: genericclioptions.NewPrintFlags("replaced"),
DeleteFlags: delete.NewDeleteFlags("to use to replace the resource."),
IOStreams: streams,
}
}//创建replace命令
func NewCmdReplace(f cmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
o := NewReplaceOptions(streams)//初始化结构体
cmd := &cobra.Command{//创建cobra命令
Use: "replace -f FILENAME",
DisableFlagsInUseLine: true,
Short: i18n.T("Replace a resource by filename or stdin"),
Long: replaceLong,
Example: replaceExample,
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(o.Complete(f, cmd, args))//准备
cmdutil.CheckErr(o.Validate(cmd))//校验
cmdutil.CheckErr(o.Run(f))//运行
},
}
o.PrintFlags.AddFlags(cmd)//打印选项
o.DeleteFlags.AddFlags(cmd)//删除选项
o.RecordFlags.AddFlags(cmd)//record选项
cmdutil.AddValidateFlags(cmd)//校验选项
cmdutil.AddApplyAnnotationFlags(cmd)//save-config选项
cmd.Flags().StringVar(&o.Raw, "raw", o.Raw, "Raw URI to PUT to the server. Uses the transport specified by the kubeconfig file.")//raw选项
return cmd
}//准备
func (o *ReplaceOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
var err error
o.RecordFlags.Complete(cmd)//record准备
o.Recorder, err = o.RecordFlags.ToRecorder()//record flag转recorder
if err != nil {
return err
}
o.validate = cmdutil.GetFlagBool(cmd, "validate")//设置validate
o.createAnnotation = cmdutil.GetFlagBool(cmd, cmdutil.ApplyAnnotationsFlag)//设置createAnnotation
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)
}
dynamicClient, err := f.DynamicClient()//获取dynamicClient
if err != nil {
return err
}
deleteOpts := o.DeleteFlags.ToOptions(dynamicClient, o.IOStreams)//deleteflag转deleteOption
//Replace will create a resource if it doesn't exist already, so ignore not found error
deleteOpts.IgnoreNotFound = true//设置IgnoreNotFound
if o.PrintFlags.OutputFormat != nil {
deleteOpts.Output = *o.PrintFlags.OutputFormat//设置Output
}
if deleteOpts.GracePeriod == 0 {//设置GracePeriod 和WaitForDeletion
// To preserve backwards compatibility, but prevent accidental data loss, we convert --grace-period=0
// into --grace-period=1 and wait until the object is successfully deleted.
deleteOpts.GracePeriod = 1
deleteOpts.WaitForDeletion = true
}
o.DeleteOptions = deleteOpts//设置DeleteOptions
err = o.DeleteOptions.FilenameOptions.RequireFilenameOrKustomize()//文件是必须的
if err != nil {
return err
}
schema, err := f.Validator(o.validate)//获取validator
if err != nil {
return err
}
o.Schema = schema//设置validateSchema
o.Builder = f.NewBuilder//设置builder
o.BuilderArgs = args//设置参数
o.Namespace, o.EnforceNamespace, err = f.ToRawKubeConfigLoader().Namespace()//设置namespace和enforceNamespace
if err != nil {
return err
}
return nil
}//校验
func (o *ReplaceOptions) Validate(cmd *cobra.Command) error {
if o.DeleteOptions.GracePeriod >= 0 && !o.DeleteOptions.ForceDeletion {//如果指定了grace-period必须指定force
return fmt.Errorf("--grace-period must have --force specified")
}
if o.DeleteOptions.Timeout != 0 && !o.DeleteOptions.ForceDeletion {//如果指定了timeout必须指定force
return fmt.Errorf("--timeout must have --force specified")
}
if cmdutil.IsFilenameSliceEmpty(o.DeleteOptions.FilenameOptions.Filenames, o.DeleteOptions.FilenameOptions.Kustomize) {//文件是必须的
return cmdutil.UsageErrorf(cmd, "Must specify --filename to replace")
}
if len(o.Raw) > 0 {//如果指定了--raw
if len(o.DeleteOptions.FilenameOptions.Filenames) != 1 {//只能指定一个文件
return cmdutil.UsageErrorf(cmd, "--raw can only use a single local file or stdin")
}
if strings.Index(o.DeleteOptions.FilenameOptions.Filenames[0], "http://") == 0 || strings.Index(o.DeleteOptions.FilenameOptions.Filenames[0], "https://") == 0 {//不能是url
return cmdutil.UsageErrorf(cmd, "--raw cannot read from a url")
}
if o.DeleteOptions.FilenameOptions.Recursive {//不能指定递归
return cmdutil.UsageErrorf(cmd, "--raw and --recursive are mutually exclusive")
}
if len(cmdutil.GetFlagString(cmd, "output")) > 0 {//不能指定output
return cmdutil.UsageErrorf(cmd, "--raw and --output are mutually exclusive")
}
if _, err := url.ParseRequestURI(o.Raw); err != nil {//raw必须是有效url
return cmdutil.UsageErrorf(cmd, "--raw must be a valid URL path: %v", err)
}
}
return nil
}//运行
func (o *ReplaceOptions) Run(f cmdutil.Factory) error {
// raw only makes sense for a single file resource multiple objects aren't likely to do what you want.
// the validator enforces this, so
if len(o.Raw) > 0 {//如果指定了raw
restClient, err := f.RESTClient()
if err != nil {
return err
}
return rawhttp.RawPut(restClient, o.IOStreams, o.Raw, o.DeleteOptions.Filenames[0])//执行rawPut
}
if o.DeleteOptions.ForceDeletion {//如果指定了force
return o.forceReplace()//执行先删除后创建
}
r := o.Builder().
Unstructured().
Schema(o.Schema).
ContinueOnError().
NamespaceParam(o.Namespace).DefaultNamespace().
FilenameParam(o.EnforceNamespace, &o.DeleteOptions.FilenameOptions).
Flatten().
Do()//用builder构造result对象
if err := r.Err(); err != nil {
return err
}
return r.Visit(func(info *resource.Info, err error) error {//visit result
if err != nil {
return err
}
if err := util.CreateOrUpdateAnnotation(o.createAnnotation, info.Object, scheme.DefaultJSONEncoder()); err != nil {//判断是否创建last-applied-configuration注解
return cmdutil.AddSourceToErr("replacing", info.Source, err)
}
if err := o.Recorder.Record(info.Object); err != nil {//判断是否创建change-cause注解
klog.V(4).Infof("error recording current command: %v", err)
}
// Serialize the object with the annotation applied.
obj, err := resource.NewHelper(info.Client, info.Mapping).Replace(info.Namespace, info.Name, true, info.Object)//replace对象到服务端
if err != nil {
return cmdutil.AddSourceToErr("replacing", info.Source, err)
}
info.Refresh(obj, true)//刷新对象
return o.PrintObj(info.Object)//打印对象
})
}//执行先删除后创建
func (o *ReplaceOptions) forceReplace() error {
for i, filename := range o.DeleteOptions.FilenameOptions.Filenames {//遍历文件
if filename == "-" {//如果文件是-
tempDir, err := ioutil.TempDir("", "kubectl_replace_")//创建临时目录
if err != nil {
return err
}
defer os.RemoveAll(tempDir)//defer删除临时目录
tempFilename := filepath.Join(tempDir, "resource.stdin")//构造文件名称
err = cmdutil.DumpReaderToFile(os.Stdin, tempFilename)//输出stdin到文件
if err != nil {
return err
}
o.DeleteOptions.FilenameOptions.Filenames[i] = tempFilename//设置文件
}
}
r := o.Builder().
Unstructured().
ContinueOnError().
NamespaceParam(o.Namespace).DefaultNamespace().
ResourceTypeOrNameArgs(false, o.BuilderArgs...).RequireObject(false).
FilenameParam(o.EnforceNamespace, &o.DeleteOptions.FilenameOptions).
Flatten().
Do()//用builder构造result对象
if err := r.Err(); err != nil {
return err
}
if err := o.DeleteOptions.DeleteResult(r); err != nil {//删除对象
return err
}
timeout := o.DeleteOptions.Timeout
if timeout == 0 {//如果没指定timeout，则timeout为5分钟
timeout = 5 * time.Minute
}
err := r.Visit(func(info *resource.Info, err error) error {//访问result
if err != nil {
return err
}
return wait.PollImmediate(1*time.Second, timeout, func() (bool, error) {//等待删除成功
if err := info.Get(); !errors.IsNotFound(err) {
return false, err
}
return true, nil
})
})
if err != nil {
return err
}
r = o.Builder().
Unstructured().
Schema(o.Schema).
ContinueOnError().
NamespaceParam(o.Namespace).DefaultNamespace().
FilenameParam(o.EnforceNamespace, &o.DeleteOptions.FilenameOptions).
Flatten().
Do()//用build构造result对象
err = r.Err()
if err != nil {
return err
}
count := 0
err = r.Visit(func(info *resource.Info, err error) error {// visit result
if err != nil {
return err
}
if err := util.CreateOrUpdateAnnotation(o.createAnnotation, info.Object, scheme.DefaultJSONEncoder()); err != nil {//判断是否创建last-applied-configuration注解
return err
}
if err := o.Recorder.Record(info.Object); err != nil {//判断是否创建change-cause注解
klog.V(4).Infof("error recording current command: %v", err)
}
obj, err := resource.NewHelper(info.Client, info.Mapping).Create(info.Namespace, true, info.Object, nil)//创建对象到服务端
if err != nil {
return err
}
count++
info.Refresh(obj, true)//刷新对象
return o.PrintObj(info.Object)//打印对象
})
if err != nil {
return err
}
if count == 0 {
return fmt.Errorf("no objects passed to replace")
}
return nil
}
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