support pod subresources

Signed-off-by: Iceber Gu <[email protected]>

go.mod

@@ -111,6 +111,7 @@ require (
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f // indirect
+	github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect

go.sum

@@ -266,6 +266,8 @@ github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
 github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f h1:KUppIJq7/+SVif2QVs3tOP0zanoHgBEVAwHxUSIzRqU=
 github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
+github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f h1:y5//uYreIhSUg3J1GEMiLbxo1LJaP8RfCpH6pymGZus=
+github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f/go.mod h1:ZdcZmHo+o7JKHSa8/e818NopupXU1YMK5fe1lsApnBw=
 github.com/nxadm/tail v1.4.8 h1:nPr65rt6Y5JFSKQO7qToXr7pePgD6Gwiw05lkbyAQTE=
 github.com/nxadm/tail v1.4.8/go.mod h1:+ncqLTQzXmGhMZNUePPaPqPvBxHAIsmXswZKocGu+AU=
 github.com/onsi/ginkgo v1.16.5 h1:8xi0RTUf59SOSfEtZMvwTvXYMzG4gV23XVHOZiXNtnE=

pkg/apiserver/registry/clusterpedia/resources/rest.go

@@ -54,7 +54,7 @@ func (s *REST) GetSingularName() string {
 
 // ConnectMethods returns the list of HTTP methods handled by Connect
 func (r *REST) ConnectMethods() []string {
-	return []string{"GET"}
+	return []string{"GET", "POST"}
 }
 
 // NewConnectOptions returns an empty options object that will be used to pass options to the Connect method.

pkg/kubeapiserver/apiserver.go

@@ -22,6 +22,7 @@ import (
 
 	informers "github.com/clusterpedia-io/clusterpedia/pkg/generated/informers/externalversions"
 	"github.com/clusterpedia-io/clusterpedia/pkg/kubeapiserver/discovery"
+	podrest "github.com/clusterpedia-io/clusterpedia/pkg/kubeapiserver/resourcerest/pod"
 	"github.com/clusterpedia-io/clusterpedia/pkg/storage"
 	"github.com/clusterpedia-io/clusterpedia/pkg/utils/filters"
 )
@@ -137,7 +138,18 @@ func (c completedConfig) New(delegationTarget genericapiserver.DelegationTarget)
 	genericserver.Handler.NonGoRestfulMux.HandlePrefix("/api/", resourceHandler)
 	genericserver.Handler.NonGoRestfulMux.HandlePrefix("/apis/", resourceHandler)
 
-	_ = NewClusterResourceController(restManager, discoveryManager, c.ExtraConfig.InformerFactory.Cluster().V1alpha2().PediaClusters())
+	controller := NewClusterResourceController(restManager, discoveryManager, c.ExtraConfig.InformerFactory.Cluster().V1alpha2().PediaClusters())
+
+	for _, rest := range podrest.GetPodsubresourceRESTs(controller) {
+		restManager.preRegisterSubresource(subresource{
+			gr:         schema.GroupResource{Group: "", Resource: "pods"},
+			kind:       "Pod",
+			namespaced: true,
+
+			name:      rest.Subresource(),
+			connecter: rest,
+		})
+	}
 	return genericserver, nil
 }
 

pkg/kubeapiserver/clusterresource_controller.go

@@ -1,11 +1,16 @@
 package kubeapiserver
 
 import (
+	"context"
+	"errors"
+	"net/http"
 	"reflect"
 
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apimachinery/pkg/util/sets"
+	"k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/cache"
+	"k8s.io/client-go/tools/clientcmd"
 	"k8s.io/klog/v2"
 
 	clusterv1alpha2 "github.com/clusterpedia-io/api/cluster/v1alpha2"
@@ -102,6 +107,66 @@ func (c *ClusterResourceController) removeCluster(name string) {
 	delete(c.clusterresources, name)
 }
 
+func (c *ClusterResourceController) resolveClusterRestConfig(name string) (*rest.Config, error) {
+	cluster, err := c.clusterLister.Get(name)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(cluster.Spec.Kubeconfig) != 0 {
+		clientconfig, err := clientcmd.NewClientConfigFromBytes(cluster.Spec.Kubeconfig)
+		if err != nil {
+			return nil, err
+		}
+		return clientconfig.ClientConfig()
+	}
+
+	if cluster.Spec.APIServer == "" {
+		return nil, errors.New("Cluster APIServer Endpoint is required")
+	}
+
+	if len(cluster.Spec.TokenData) == 0 &&
+		(len(cluster.Spec.CertData) == 0 || len(cluster.Spec.KeyData) == 0) {
+		return nil, errors.New("Cluster APIServer's Token or Cert is required")
+	}
+
+	config := &rest.Config{
+		Host: cluster.Spec.APIServer,
+	}
+
+	if len(cluster.Spec.CAData) != 0 {
+		config.TLSClientConfig.CAData = cluster.Spec.CAData
+	} else {
+		config.TLSClientConfig.Insecure = true
+	}
+
+	if len(cluster.Spec.CertData) != 0 && len(cluster.Spec.KeyData) != 0 {
+		config.TLSClientConfig.CertData = cluster.Spec.CertData
+		config.TLSClientConfig.KeyData = cluster.Spec.KeyData
+	}
+
+	if len(cluster.Spec.TokenData) != 0 {
+		config.BearerToken = string(cluster.Spec.TokenData)
+	}
+	return config, nil
+}
+
+func (c *ClusterResourceController) GetClusterDefaultConnection(ctx context.Context, name string) (string, http.RoundTripper, error) {
+	config, err := c.resolveClusterRestConfig(name)
+	if err != nil {
+		return "", nil, err
+	}
+	transport, err := rest.TransportFor(config)
+	if err != nil {
+		return "", nil, err
+	}
+	return config.Host, transport, nil
+}
+
+func (c *ClusterResourceController) GetClusterConnectionWithTLSConfig(ctx context.Context, name string) (string, http.RoundTripper, error) {
+	return "", nil, errors.New("CetClusterConnectionWithTLSConfig not implemented")
+}
+
 type resourceInfo struct {
 	Namespaced bool
 	Kind       string

pkg/kubeapiserver/resource_handler.go

@@ -1,6 +1,7 @@
 package kubeapiserver
 
 import (
+	"context"
 	"fmt"
 	"net/http"
 	"time"
@@ -12,12 +13,14 @@ import (
 	"k8s.io/apiserver/pkg/endpoints/handlers"
 	"k8s.io/apiserver/pkg/endpoints/handlers/responsewriters"
 	genericrequest "k8s.io/apiserver/pkg/endpoints/request"
+	registryrest "k8s.io/apiserver/pkg/registry/rest"
 	"k8s.io/apiserver/pkg/warning"
 	"k8s.io/klog/v2"
 
 	clusterv1alpha2 "github.com/clusterpedia-io/api/cluster/v1alpha2"
 	clusterlister "github.com/clusterpedia-io/clusterpedia/pkg/generated/listers/cluster/v1alpha2"
 	"github.com/clusterpedia-io/clusterpedia/pkg/kubeapiserver/discovery"
+	"github.com/clusterpedia-io/clusterpedia/pkg/kubeapiserver/resourcerest"
 	"github.com/clusterpedia-io/clusterpedia/pkg/utils/request"
 )
 
@@ -76,8 +79,9 @@ func (r *ResourceHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 		return
 	}
 
-	info := r.rest.GetRESTResourceInfo(gvr)
-	if info.Empty() {
+	resource, reqScope, storage, existed := r.rest.GetResourceREST(gvr, requestInfo.Subresource)
+	if !existed {
+		// TODO(iceber): Add the specialized error for subresources
 		err := fmt.Errorf("not found request scope or resource storage")
 		klog.ErrorS(err, "Failed to handle resource request", "resource", gvr)
 		responsewriters.ErrorNegotiated(
@@ -87,58 +91,79 @@ func (r *ResourceHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 		return
 	}
 
-	resource, reqScope, storage := info.APIResource, info.RequestScope, info.Storage
 	if requestInfo.Namespace != "" && !resource.Namespaced {
 		r.delegate.ServeHTTP(w, req)
 		return
 	}
 
 	// Check the health of the cluster
-	if cluster != nil {
-		var msg string
-		healthyCondition := meta.FindStatusCondition(cluster.Status.Conditions, clusterv1alpha2.ClusterHealthyCondition)
-		switch {
-		case healthyCondition == nil:
-			msg = fmt.Sprintf("%s is not ready and the resources obtained may be inaccurate.", clusterName)
-		case healthyCondition.Status != metav1.ConditionTrue:
-			msg = fmt.Sprintf("%s is not ready and the resources obtained may be inaccurate, reason: %s", clusterName, healthyCondition.Reason)
+	checkClusterAndWarning(req.Context(), cluster)
+
+	switch storage := storage.(type) {
+	case *resourcerest.RESTStorage:
+		var handler http.Handler
+		switch requestInfo.Verb {
+		case "get":
+			if clusterName == "" {
+				responsewriters.ErrorNegotiated(
+					apierrors.NewBadRequest("please specify the cluster name when using the resource name to get a specific resource."),
+					Codecs, gvr.GroupVersion(), w, req,
+				)
+				return
+			}
+			handler = handlers.GetResource(storage, reqScope)
+		case "list":
+			handler = handlers.ListResource(storage, nil, reqScope, false, r.minRequestTimeout)
+		case "watch":
+			handler = handlers.ListResource(storage, storage, reqScope, true, r.minRequestTimeout)
+		default:
+			responsewriters.ErrorNegotiated(
+				apierrors.NewMethodNotSupported(gvr.GroupResource(), requestInfo.Verb),
+				Codecs, gvr.GroupVersion(), w, req,
+			)
+			return
 		}
-		/*
-			TODO(scyda): Determine the synchronization status of a specific resource
+		handler.ServeHTTP(w, req)
 
-			for _, resource := range c.Status.Resources {
+	case registryrest.Connecter:
+		var supported bool
+		for _, method := range storage.ConnectMethods() {
+			if req.Method == method {
+				supported = true
 			}
-		*/
-
-		if msg != "" {
-			warning.AddWarning(req.Context(), "", msg)
 		}
-	}
-
-	var handler http.Handler
-	switch requestInfo.Verb {
-	case "get":
-		if clusterName == "" {
+		if !supported {
 			responsewriters.ErrorNegotiated(
-				apierrors.NewBadRequest("please specify the cluster name when using the resource name to get a specific resource."),
+				apierrors.NewMethodNotSupported(gvr.GroupResource(), requestInfo.Verb),
 				Codecs, gvr.GroupVersion(), w, req,
 			)
 			return
 		}
 
-		handler = handlers.GetResource(storage, reqScope)
-	case "list":
-		handler = handlers.ListResource(storage, nil, reqScope, false, r.minRequestTimeout)
-	case "watch":
-		handler = handlers.ListResource(storage, storage, reqScope, true, r.minRequestTimeout)
-	default:
-		responsewriters.ErrorNegotiated(
-			apierrors.NewMethodNotSupported(gvr.GroupResource(), requestInfo.Verb),
-			Codecs, gvr.GroupVersion(), w, req,
-		)
+		handlers.ConnectResource(storage, reqScope, nil, "", true).ServeHTTP(w, req)
 	}
+}
 
-	if handler != nil {
-		handler.ServeHTTP(w, req)
+func checkClusterAndWarning(ctx context.Context, cluster *clusterv1alpha2.PediaCluster) {
+	if cluster == nil {
+		return
+	}
+	var msg string
+	healthyCondition := meta.FindStatusCondition(cluster.Status.Conditions, clusterv1alpha2.ClusterHealthyCondition)
+	switch {
+	case healthyCondition == nil:
+		msg = fmt.Sprintf("%s is not ready and the resources obtained may be inaccurate.", cluster.Name)
+	case healthyCondition.Status != metav1.ConditionTrue:
+		msg = fmt.Sprintf("%s is not ready and the resources obtained may be inaccurate, reason: %s", cluster.Name, healthyCondition.Reason)
+	}
+	/*
+		TODO(scyda): Determine the synchronization status of a specific resource
+
+		for _, resource := range c.Status.Resources {
+		}
+	*/
+
+	if msg != "" {
+		warning.AddWarning(ctx, "", msg)
 	}
 }