【kubernetes/k8s源码分析】kube-apiserverd go restful 框架使用
go-restful框架概念 简单例子ws := new(restful.WebService)ws.Path("/users").Consumes(restful.MIME_XML, restful.MIME_JSON).Produces(restful.MIME_JSON, restful.MIME_XML)ws.Route(ws.GET("/{user-i
go-restful框架概念
简单例子
ws := new(restful.WebService)
ws.
Path("/users").
Consumes(restful.MIME_XML, restful.MIME_JSON).
Produces(restful.MIME_JSON, restful.MIME_XML)
ws.Route(ws.GET("/{user-id}").To(u.findUser).
Doc("get a user").
Param(ws.PathParameter("user-id", "identifier of the user").DataType("string")).
Writes(User{}))
...
func (u UserResource) findUser(request *restful.Request, response *restful.Response) {
id := request.PathParameter("user-id")
...
}
-
Route
路由包含两种,一种是RouterJSR311,一种是快速路由CurlyRouter。
CurlyRouter支持正则表达式和动态参数,相比RouterJSR11更加轻量级,k8s使用的是快速路由。
Route包含:http Method,URL Path,输入输出类型(JSON/YAML)以及回调函数restful.RouteFunction,响应内容类型(Accept)等。
// Route binds a HTTP Method,Path,Consumes combination to a RouteFunction.
type Route struct {
Method string
Produces []string
Consumes []string
Path string // webservice root path + described path
Function RouteFunction
Filters []FilterFunction
If []RouteSelectionConditionFunction
// cached values for dispatching
relativePath string
pathParts []string
pathExpr *pathExpression // cached compilation of relativePath as RegExp
// documentation
Doc string
Notes string
Operation string
ParameterDocs []*Parameter
ResponseErrors map[int]ResponseError
ReadSample, WriteSample interface{} // structs that model an example request or response payload
// Extra information used to store custom information about the route.
Metadata map[string]interface{}
// marks a route as deprecated
Deprecated bool
}
-
WebService
WebService逻辑上是Route的集合,功能上主要是为一组Route统一设置包括root path,请求响应的数据类型等一些通用的属性。WebService必须加入到Container中才能生效。
// WebService holds a collection of Route values that bind a Http Method + URL Path to a function.
type WebService struct {
rootPath string
pathExpr *pathExpression // cached compilation of rootPath as RegExp
routes []Route
produces []string
consumes []string
pathParameters []*Parameter
filters []FilterFunction
documentation string
apiVersion string
typeNameHandleFunc TypeNameHandleFunction
dynamicRoutes bool
// protects 'routes' if dynamic routes are enabled
routesLock sync.RWMutex
}
-
Container
Container逻辑上是WebService的集合,包括一组restful.WebService和一个http.ServeMux对象,使用RouteSelector进行请求派发。
// Container holds a collection of WebServices and a http.ServeMux to dispatch http requests.
// The requests are further dispatched to routes of WebServices using a RouteSelector
type Container struct {
webServicesLock sync.RWMutex
webServices []*WebService
ServeMux *http.ServeMux
isRegisteredOnRoot bool
containerFilters []FilterFunction
doNotRecover bool // default is true
recoverHandleFunc RecoverHandleFunction
serviceErrorHandleFunc ServiceErrorHandleFunction
router RouteSelector // default is a CurlyRouter (RouterJSR311 is a slower alternative)
contentEncodingEnabled bool // default is false
}
2 初始化流程
- create container
- create WebService
- create route, filter and bind to route handler
- router -> WebService
- WebService -> container
- new server with
Handler=container
- start server
3 结构体
3.1 Container结构体
-
Container逻辑上是WebService的集合,包括一组restful.WebService和一个http.ServeMux对象,使用RouteSelector进行请求派发。
// Container holds a collection of WebServices and a http.ServeMux to dispatch http requests.
// The requests are further dispatched to routes of WebServices using a RouteSelector
type Container struct {
webServicesLock sync.RWMutex
webServices []*WebService
ServeMux *http.ServeMux
isRegisteredOnRoot bool
containerFilters []FilterFunction
doNotRecover bool // default is true
recoverHandleFunc RecoverHandleFunction
serviceErrorHandleFunc ServiceErrorHandleFunction
router RouteSelector // default is a CurlyRouter (RouterJSR311 is a slower alternative)
contentEncodingEnabled bool // default is false
}
3.2 WebService结构体
-
WebService逻辑上是Route的集合,功能上主要是为一组Route统一设置包括root path,请求响应的数据类型等一些通用的属性。
WebService必须加入到Container中才能生效。
// WebService holds a collection of Route values that bind a Http Method + URL Path to a function.
type WebService struct {
rootPath string
pathExpr *pathExpression // cached compilation of rootPath as RegExp
routes []Route
produces []string
consumes []string
pathParameters []*Parameter
filters []FilterFunction
documentation string
apiVersion string
typeNameHandleFunc TypeNameHandleFunction
dynamicRoutes bool
// protects 'routes' if dynamic routes are enabled
routesLock sync.RWMutex
}
3.3 Route结构体
-
路由包含两种,一种是RouterJSR311,一种是快速路由CurlyRouter。
CurlyRouter支持正则表达式和动态参数,相比RouterJSR11更加轻量级,k8s默认使用的是快速路由。
Route包含:http Method,URL Path,输入输出类型(JSON/YAML)以及回调函数restful.RouteFunction,响应内容类型(Accept)等。
// Route binds a HTTP Method,Path,Consumes combination to a RouteFunction.
type Route struct {
Method string
Produces []string
Consumes []string
Path string // webservice root path + described path
Function RouteFunction
Filters []FilterFunction
// cached values for dispatching
relativePath string
pathParts []string
pathExpr *pathExpression // cached compilation of relativePath as RegExp
// documentation
Doc string
Notes string
Operation string
ParameterDocs []*Parameter
ResponseErrors map[int]ResponseError
ReadSample, WriteSample interface{} // structs that model an example request or response payload
// Extra information used to store custom information about the route.
Metadata map[string]interface{}
}
3.4 Path
-
path分类如下: 路径上整体分成 group, version, resource, 核心 API group 包括 pod, node 等resource
3.5 APIGroupInfo
-
APIGroupInfo定义了一个 API 组的相关信息
// Info about an API group.
type APIGroupInfo struct {
PrioritizedVersions []schema.GroupVersion
// Info about the resources in this group. It's a map from version to resource to the storage.
VersionedResourcesStorageMap map[string]map[string]rest.Storage
// OptionsExternalVersion controls the APIVersion used for common objects in the
// schema like api.Status, api.DeleteOptions, and metav1.ListOptions. Other implementors may
// define a version "v1beta1" but want to use the Kubernetes "v1" internal objects.
// If nil, defaults to groupMeta.GroupVersion.
// TODO: Remove this when https://github.com/kubernetes/kubernetes/issues/19018 is fixed.
OptionsExternalVersion *schema.GroupVersion
// MetaGroupVersion defaults to "meta.k8s.io/v1" and is the scheme group version used to decode
// common API implementations like ListOptions. Future changes will allow this to vary by group
// version (for when the inevitable meta/v2 group emerges).
MetaGroupVersion *schema.GroupVersion
// Scheme includes all of the types used by this group and how to convert between them (or
// to convert objects from outside of this group that are accepted in this API).
// TODO: replace with interfaces
Scheme *runtime.Scheme
// NegotiatedSerializer controls how this group encodes and decodes data
NegotiatedSerializer runtime.NegotiatedSerializer
// ParameterCodec performs conversions for query parameters passed to API calls
ParameterCodec runtime.ParameterCodec
}
4 Container初始化过程
调用过程: main –> App.Run –> master.Complete.New –> c.Config.GenericConfig.SkipComplete().New()
4.1 New函数
-
路径: pkg/master/master.go
func (c completedConfig) New(delegationTarget genericapiserver.DelegationTarget) (*Master, error) {
if reflect.DeepEqual(c.ExtraConfig.KubeletClientConfig, kubeletclient.KubeletClientConfig{}) {
return nil, fmt.Errorf("Master.New() called with empty config.KubeletClientConfig")
}
s, err := c.GenericConfig.New("kube-apiserver", delegationTarget)
if err != nil {
return nil, err
}
if c.ExtraConfig.EnableLogsSupport {
routes.Logs{}.Install(s.Handler.GoRestfulContainer)
}
m := &Master{
GenericAPIServer: s,
}
// install legacy rest storage
if c.ExtraConfig.APIResourceConfigSource.VersionEnabled(apiv1.SchemeGroupVersion) {
legacyRESTStorageProvider := corerest.LegacyRESTStorageProvider{
StorageFactory: c.ExtraConfig.StorageFactory,
ProxyTransport: c.ExtraConfig.ProxyTransport,
KubeletClientConfig: c.ExtraConfig.KubeletClientConfig,
EventTTL: c.ExtraConfig.EventTTL,
ServiceIPRange: c.ExtraConfig.ServiceIPRange,
ServiceNodePortRange: c.ExtraConfig.ServiceNodePortRange,
LoopbackClientConfig: c.GenericConfig.LoopbackClientConfig,
ServiceAccountIssuer: c.ExtraConfig.ServiceAccountIssuer,
ServiceAccountAPIAudiences: c.ExtraConfig.ServiceAccountAPIAudiences,
}
m.InstallLegacyAPI(&c, c.GenericConfig.RESTOptionsGetter, legacyRESTStorageProvider)
}
// The order here is preserved in discovery.
// If resources with identical names exist in more than one of these groups (e.g. "deployments.apps"" and "deployments.extensions"),
// the order of this list determines which group an unqualified resource name (e.g. "deployments") should prefer.
// This priority order is used for local discovery, but it ends up aggregated in `k8s.io/kubernetes/cmd/kube-apiserver/app/aggregator.go
// with specific priorities.
// TODO: describe the priority all the way down in the RESTStorageProviders and plumb it back through the various discovery
// handlers that we have.
restStorageProviders := []RESTStorageProvider{
authenticationrest.RESTStorageProvider{Authenticator: c.GenericConfig.Authentication.Authenticator},
authorizationrest.RESTStorageProvider{Authorizer: c.GenericConfig.Authorization.Authorizer, RuleResolver: c.GenericConfig.RuleResolver},
autoscalingrest.RESTStorageProvider{},
batchrest.RESTStorageProvider{},
certificatesrest.RESTStorageProvider{},
extensionsrest.RESTStorageProvider{},
networkingrest.RESTStorageProvider{},
policyrest.RESTStorageProvider{},
rbacrest.RESTStorageProvider{Authorizer: c.GenericConfig.Authorization.Authorizer},
schedulingrest.RESTStorageProvider{},
settingsrest.RESTStorageProvider{},
storagerest.RESTStorageProvider{},
// keep apps after extensions so legacy clients resolve the extensions versions of shared resource names.
// See https://github.com/kubernetes/kubernetes/issues/42392
appsrest.RESTStorageProvider{},
admissionregistrationrest.RESTStorageProvider{},
eventsrest.RESTStorageProvider{TTL: c.ExtraConfig.EventTTL},
}
m.InstallAPIs(c.ExtraConfig.APIResourceConfigSource, c.GenericConfig.RESTOptionsGetter, restStorageProviders...)
if c.ExtraConfig.Tunneler != nil {
m.installTunneler(c.ExtraConfig.Tunneler, corev1client.NewForConfigOrDie(c.GenericConfig.LoopbackClientConfig).Nodes())
}
m.GenericAPIServer.AddPostStartHookOrDie("ca-registration", c.ExtraConfig.ClientCARegistrationHook.PostStartHook)
return m, nil
}
func (c completedConfig) New(name string, delegationTarget DelegationTarget) (*GenericAPIServer, error) {
if c.Serializer == nil {
return nil, fmt.Errorf("Genericapiserver.New() called with config.Serializer == nil")
}
if c.LoopbackClientConfig == nil {
return nil, fmt.Errorf("Genericapiserver.New() called with config.LoopbackClientConfig == nil")
}
handlerChainBuilder := func(handler http.Handler) http.Handler {
return c.BuildHandlerChainFunc(handler, c.Config)
}
apiServerHandler := NewAPIServerHandler(name, c.Serializer, handlerChainBuilder, delegationTarget.UnprotectedHandler())
s := &GenericAPIServer{
discoveryAddresses: c.DiscoveryAddresses,
LoopbackClientConfig: c.LoopbackClientConfig,
legacyAPIGroupPrefixes: c.LegacyAPIGroupPrefixes,
admissionControl: c.AdmissionControl,
Serializer: c.Serializer,
AuditBackend: c.AuditBackend,
delegationTarget: delegationTarget,
HandlerChainWaitGroup: c.HandlerChainWaitGroup,
minRequestTimeout: time.Duration(c.MinRequestTimeout) * time.Second,
ShutdownTimeout: c.RequestTimeout,
SecureServingInfo: c.SecureServing,
ExternalAddress: c.ExternalAddress,
Handler: apiServerHandler,
listedPathProvider: apiServerHandler,
swaggerConfig: c.SwaggerConfig,
openAPIConfig: c.OpenAPIConfig,
postStartHooks: map[string]postStartHookEntry{},
preShutdownHooks: map[string]preShutdownHookEntry{},
disabledPostStartHooks: c.DisabledPostStartHooks,
healthzChecks: c.HealthzChecks,
DiscoveryGroupManager: discovery.NewRootAPIsHandler(c.DiscoveryAddresses, c.Serializer),
enableAPIResponseCompression: c.EnableAPIResponseCompression,
}
for k, v := range delegationTarget.PostStartHooks() {
s.postStartHooks[k] = v
}
for k, v := range delegationTarget.PreShutdownHooks() {
s.preShutdownHooks[k] = v
}
genericApiServerHookName := "generic-apiserver-start-informers"
if c.SharedInformerFactory != nil && !s.isPostStartHookRegistered(genericApiServerHookName) {
err := s.AddPostStartHook(genericApiServerHookName, func(context PostStartHookContext) error {
c.SharedInformerFactory.Start(context.StopCh)
return nil
})
if err != nil {
return nil, err
}
}
for _, delegateCheck := range delegationTarget.HealthzChecks() {
skip := false
for _, existingCheck := range c.HealthzChecks {
if existingCheck.Name() == delegateCheck.Name() {
skip = true
break
}
}
if skip {
continue
}
s.healthzChecks = append(s.healthzChecks, delegateCheck)
}
s.listedPathProvider = routes.ListedPathProviders{s.listedPathProvider, delegationTarget}
installAPI(s, c.Config)
// use the UnprotectedHandler from the delegation target to ensure that we don't attempt to double authenticator, authorize,
// or some other part of the filter chain in delegation cases.
if delegationTarget.UnprotectedHandler() == nil && c.EnableIndex {
s.Handler.NonGoRestfulMux.NotFoundHandler(routes.IndexLister{
StatusCode: http.StatusNotFound,
PathProvider: s.listedPathProvider,
})
}
return s, nil
}
4.2 NewAPIServerHandler函数
-
创建Container结构
-
快速路由
-
创建http的ServecMux
-
RecoverHnadle是 panic后恢复函数
func NewAPIServerHandler(name string, s runtime.NegotiatedSerializer, handlerChainBuilder HandlerChainBuilderFn, notFoundHandler http.Handler) *APIServerHandler {
nonGoRestfulMux := mux.NewPathRecorderMux(name)
if notFoundHandler != nil {
nonGoRestfulMux.NotFoundHandler(notFoundHandler)
}
gorestfulContainer := restful.NewContainer()
gorestfulContainer.ServeMux = http.NewServeMux()
gorestfulContainer.Router(restful.CurlyRouter{}) // e.g. for proxy/{kind}/{name}/{*}
gorestfulContainer.RecoverHandler(func(panicReason interface{}, httpWriter http.ResponseWriter) {
logStackOnRecover(s, panicReason, httpWriter)
})
gorestfulContainer.ServiceErrorHandler(func(serviceErr restful.ServiceError, request *restful.Request, response *restful.Response) {
serviceErrorHandler(s, serviceErr, request, response)
})
director := director{
name: name,
goRestfulContainer: gorestfulContainer,
nonGoRestfulMux: nonGoRestfulMux,
}
return &APIServerHandler{
FullHandlerChain: handlerChainBuilder(director),
GoRestfulContainer: gorestfulContainer,
NonGoRestfulMux: nonGoRestfulMux,
Director: director,
}
}
5 WebService初始化过程
Container已创建并且也进行了初始化。该轮到WebService了
5.1 installAPI函数
-
很多的routes Install处理过程
func installAPI(s *GenericAPIServer, c *Config) {
if c.EnableIndex {
routes.Index{}.Install(s.listedPathProvider, s.Handler.NonGoRestfulMux)
}
if c.SwaggerConfig != nil && c.EnableSwaggerUI {
routes.SwaggerUI{}.Install(s.Handler.NonGoRestfulMux)
}
if c.EnableProfiling {
routes.Profiling{}.Install(s.Handler.NonGoRestfulMux)
if c.EnableContentionProfiling {
goruntime.SetBlockProfileRate(1)
}
}
if c.EnableMetrics {
if c.EnableProfiling {
routes.MetricsWithReset{}.Install(s.Handler.NonGoRestfulMux)
} else {
routes.DefaultMetrics{}.Install(s.Handler.NonGoRestfulMux)
}
}
routes.Version{Version: c.Version}.Install(s.Handler.GoRestfulContainer)
if c.EnableDiscovery {
s.Handler.GoRestfulContainer.Add(s.DiscoveryGroupManager.WebService())
}
}
/api的注册是InstallLegacyAPIGroup()接口
/apis的注册是InstallAPIGroup()
这两个接口都会调用s.installAPIResources(),最后再调用InstallREST()进行API注册
5.2 InstallRest函数
-
prefix/group/version
-
创建一个APIInstaller对象
-
最主要的是installer.Install 函数,第6节详细讲解
-
将webService加入到container
func (g *APIGroupVersion) InstallREST(container *restful.Container) error {
prefix := path.Join(g.Root, g.GroupVersion.Group, g.GroupVersion.Version)
installer := &APIInstaller{
group: g,
prefix: prefix,
minRequestTimeout: g.MinRequestTimeout,
enableAPIResponseCompression: g.EnableAPIResponseCompression,
}
apiResources, ws, registrationErrors := installer.Install()
versionDiscoveryHandler := discovery.NewAPIVersionHandler(g.Serializer, g.GroupVersion, staticLister{apiResources})
versionDiscoveryHandler.AddToWebService(ws)
container.Add(ws)
return utilerrors.NewAggregate(registrationErrors)
}
5.3 Install函数
-
创建一个WebService结构体
-
将所有path排列
-
registerResourceHandlers注册各个URL关键接口
func (a *APIInstaller) Install() ([]metav1.APIResource, *restful.WebService, []error) {
var apiResources []metav1.APIResource
var errors []error
ws := a.newWebService()
// Register the paths in a deterministic (sorted) order to get a deterministic swagger spec.
paths := make([]string, len(a.group.Storage))
var i int = 0
for path := range a.group.Storage {
paths[i] = path
i++
}
sort.Strings(paths)
for _, path := range paths {
apiResource, err := a.registerResourceHandlers(path, a.group.Storage[path], ws)
if err != nil {
errors = append(errors, fmt.Errorf("error in registering resource: %s, %v", path, err))
}
if apiResource != nil {
apiResources = append(apiResources, *apiResource)
}
}
return apiResources, ws, errors
}
6 RegisterResourceHandlers函数
这个函数涉及的 内容比较多,分开一段一段讲解
6.1 创建creater lister getter 等,也就是storage,对应etcd不同操作
// what verbs are supported by the storage, used to know what verbs we support per path
creater, isCreater := storage.(rest.Creater)
namedCreater, isNamedCreater := storage.(rest.NamedCreater)
lister, isLister := storage.(rest.Lister)
getter, isGetter := storage.(rest.Getter)
getterWithOptions, isGetterWithOptions := storage.(rest.GetterWithOptions)
gracefulDeleter, isGracefulDeleter := storage.(rest.GracefulDeleter)
collectionDeleter, isCollectionDeleter := storage.(rest.CollectionDeleter)
updater, isUpdater := storage.(rest.Updater)
patcher, isPatcher := storage.(rest.Patcher)
watcher, isWatcher := storage.(rest.Watcher)
connecter, isConnecter := storage.(rest.Connecter)
storageMeta, isMetadata := storage.(rest.StorageMetadata)
6.1 分为两类,有namespace,无namespace
switch {
case !namespaceScoped:
// Handle non-namespace scoped resources like nodes.
resourcePath := resource
resourceParams := params
itemPath := resourcePath + "/{name}"
nameParams := append(params, nameParam)
proxyParams := append(nameParams, pathParam)
suffix := ""
if isSubresource {
suffix = "/" + subresource
itemPath = itemPath + suffix
resourcePath = itemPath
resourceParams = nameParams
}
apiResource.Name = path
apiResource.Namespaced = false
apiResource.Kind = resourceKind
namer := handlers.ContextBasedNaming{
SelfLinker: a.group.Linker,
ClusterScoped: true,
SelfLinkPathPrefix: gpath.Join(a.prefix, resource) + "/",
SelfLinkPathSuffix: suffix,
}
// Handler for standard REST verbs (GET, PUT, POST and DELETE).
// Add actions at the resource path: /api/apiVersion/resource
actions = appendIf(actions, action{"LIST", resourcePath, resourceParams, namer, false}, isLister)
actions = appendIf(actions, action{"POST", resourcePath, resourceParams, namer, false}, isCreater)
actions = appendIf(actions, action{"DELETECOLLECTION", resourcePath, resourceParams, namer, false}, isCollectionDeleter)
// DEPRECATED
actions = appendIf(actions, action{"WATCHLIST", "watch/" + resourcePath, resourceParams, namer, false}, allowWatchList)
// Add actions at the item path: /api/apiVersion/resource/{name}
actions = appendIf(actions, action{"GET", itemPath, nameParams, namer, false}, isGetter)
if getSubpath {
actions = appendIf(actions, action{"GET", itemPath + "/{path:*}", proxyParams, namer, false}, isGetter)
}
actions = appendIf(actions, action{"PUT", itemPath, nameParams, namer, false}, isUpdater)
actions = appendIf(actions, action{"PATCH", itemPath, nameParams, namer, false}, isPatcher)
actions = appendIf(actions, action{"DELETE", itemPath, nameParams, namer, false}, isGracefulDeleter)
actions = appendIf(actions, action{"WATCH", "watch/" + itemPath, nameParams, namer, false}, isWatcher)
actions = appendIf(actions, action{"CONNECT", itemPath, nameParams, namer, false}, isConnecter)
actions = appendIf(actions, action{"CONNECT", itemPath + "/{path:*}", proxyParams, namer, false}, isConnecter && connectSubpath)
break
default:
namespaceParamName := "namespaces"
// Handler for standard REST verbs (GET, PUT, POST and DELETE).
namespaceParam := ws.PathParameter("namespace", "object name and auth scope, such as for teams and projects").DataType("string")
namespacedPath := namespaceParamName + "/{" + "namespace" + "}/" + resource
namespaceParams := []*restful.Parameter{namespaceParam}
resourcePath := namespacedPath
resourceParams := namespaceParams
itemPath := namespacedPath + "/{name}"
nameParams := append(namespaceParams, nameParam)
proxyParams := append(nameParams, pathParam)
itemPathSuffix := ""
if isSubresource {
itemPathSuffix = "/" + subresource
itemPath = itemPath + itemPathSuffix
resourcePath = itemPath
resourceParams = nameParams
}
apiResource.Name = path
apiResource.Namespaced = true
apiResource.Kind = resourceKind
namer := handlers.ContextBasedNaming{
SelfLinker: a.group.Linker,
ClusterScoped: false,
SelfLinkPathPrefix: gpath.Join(a.prefix, namespaceParamName) + "/",
SelfLinkPathSuffix: itemPathSuffix,
}
actions = appendIf(actions, action{"LIST", resourcePath, resourceParams, namer, false}, isLister)
actions = appendIf(actions, action{"POST", resourcePath, resourceParams, namer, false}, isCreater)
actions = appendIf(actions, action{"DELETECOLLECTION", resourcePath, resourceParams, namer, false}, isCollectionDeleter)
// DEPRECATED
actions = appendIf(actions, action{"WATCHLIST", "watch/" + resourcePath, resourceParams, namer, false}, allowWatchList)
actions = appendIf(actions, action{"GET", itemPath, nameParams, namer, false}, isGetter)
if getSubpath {
actions = appendIf(actions, action{"GET", itemPath + "/{path:*}", proxyParams, namer, false}, isGetter)
}
actions = appendIf(actions, action{"PUT", itemPath, nameParams, namer, false}, isUpdater)
actions = appendIf(actions, action{"PATCH", itemPath, nameParams, namer, false}, isPatcher)
actions = appendIf(actions, action{"DELETE", itemPath, nameParams, namer, false}, isGracefulDeleter)
actions = appendIf(actions, action{"WATCH", "watch/" + itemPath, nameParams, namer, false}, isWatcher)
actions = appendIf(actions, action{"CONNECT", itemPath, nameParams, namer, false}, isConnecter)
actions = appendIf(actions, action{"CONNECT", itemPath + "/{path:*}", proxyParams, namer, false}, isConnecter && connectSubpath)
// list or post across namespace.
// For ex: LIST all pods in all namespaces by sending a LIST request at /api/apiVersion/pods.
// TODO: more strongly type whether a resource allows these actions on "all namespaces" (bulk delete)
if !isSubresource {
actions = appendIf(actions, action{"LIST", resource, params, namer, true}, isLister)
actions = appendIf(actions, action{"WATCHLIST", "watch/" + resource, params, namer, true}, allowWatchList)
}
break
}
6.2 遍历所有action,
for _, action := range actions {
..........
for _, route := range routes {
route.Metadata(ROUTE_META_GVK, metav1.GroupVersionKind{
Group: reqScope.Kind.Group,
Version: reqScope.Kind.Version,
Kind: reqScope.Kind.Kind,
})
route.Metadata(ROUTE_META_ACTION, strings.ToLower(action.Verb))
ws.Route(route)
}
// Note: update GetAuthorizerAttributes() when adding a custom handler.
}
routes := []*restful.RouteBuilder{}
6.2.1 创建RouteBuilder对象
routes := []*restful.RouteBuilder{}
6.2.2 只讲解其GET操作,其他操作大同小异
switch action.Verb {
case "GET": // Get a resource.
var handler restful.RouteFunction
if isGetterWithOptions {
handler = restfulGetResourceWithOptions(getterWithOptions, reqScope, isSubresource)
} else {
handler = restfulGetResource(getter, exporter, reqScope)
}
if needOverride {
// need change the reported verb
handler = metrics.InstrumentRouteFunc(verbOverrider.OverrideMetricsVerb(action.Verb), resource, subresource, requestScope, handler)
} else {
handler = metrics.InstrumentRouteFunc(action.Verb, resource, subresource, requestScope, handler)
}
if a.enableAPIResponseCompression {
handler = genericfilters.RestfulWithCompression(handler)
}
doc := "read the specified " + kind
if isSubresource {
doc = "read " + subresource + " of the specified " + kind
}
route := ws.GET(action.Path).To(handler).
Doc(doc).
Param(ws.QueryParameter("pretty", "If 'true', then the output is pretty printed.")).
Operation("read"+namespaced+kind+strings.Title(subresource)+operationSuffix).
Produces(append(storageMeta.ProducesMIMETypes(action.Verb), mediaTypes...)...).
Returns(http.StatusOK, "OK", producedObject).
Writes(producedObject)
if isGetterWithOptions {
if err := addObjectParams(ws, route, versionedGetOptions); err != nil {
return nil, err
}
}
if isExporter {
if err := addObjectParams(ws, route, versionedExportOptions); err != nil {
return nil, err
}
}
addParams(route, action.Params)
routes = append(routes, route)
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