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apiserver.go
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apiserver.go
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// Copyright 2021 VMware, Inc.
// SPDX-License-Identifier: Apache-2.0
package apiserver
import (
"context"
"fmt"
"net"
"os"
"time"
"github.com/vmware-tanzu/carvel-kapp-controller/pkg/apiserver/openapi"
kcinstall "github.com/vmware-tanzu/carvel-kapp-controller/pkg/apis/kappctrl/install"
kcclient "github.com/vmware-tanzu/carvel-kapp-controller/pkg/client/clientset/versioned"
"github.com/vmware-tanzu/carvel-kapp-controller/pkg/apiserver/apis/datapackaging"
datapkginginstall "github.com/vmware-tanzu/carvel-kapp-controller/pkg/apiserver/apis/datapackaging/install"
"github.com/vmware-tanzu/carvel-kapp-controller/pkg/apiserver/apis/datapackaging/v1alpha1"
packagerest "github.com/vmware-tanzu/carvel-kapp-controller/pkg/apiserver/registry/datapackaging"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
apirest "k8s.io/apiserver/pkg/registry/rest"
genericapiserver "k8s.io/apiserver/pkg/server"
"k8s.io/apiserver/pkg/server/dynamiccertificates"
genericoptions "k8s.io/apiserver/pkg/server/options"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
genericopenapi "k8s.io/apiserver/pkg/endpoints/openapi"
"k8s.io/klog"
apiregv1 "k8s.io/kube-aggregator/pkg/apis/apiregistration/v1"
aggregatorclient "k8s.io/kube-aggregator/pkg/client/clientset_generated/clientset"
)
const (
// selfSignedCertDir is the dir kapp-controller self signed certificates are created in.
selfSignedCertDir = "/home/kapp-controller/kc-agg-api-selfsigned-certs"
TokenPath = "/token-dir"
kappctrlNSEnvKey = "KAPPCTRL_SYSTEM_NAMESPACE"
kappctrlSVCEnvKey = "KAPPCTRL_SYSTEM_SERVICE"
apiServiceName = "v1alpha1.data.packaging.carvel.dev"
)
var (
Scheme = runtime.NewScheme()
Codecs = serializer.NewCodecFactory(Scheme)
)
func init() {
// Setup the scheme the server will use
datapkginginstall.Install(Scheme)
kcinstall.Install(Scheme)
metav1.AddToGroupVersion(Scheme, schema.GroupVersion{Version: "v1"})
unversioned := schema.GroupVersion{Group: "", Version: "v1"}
Scheme.AddUnversionedTypes(unversioned,
&metav1.Status{},
&metav1.APIVersions{},
&metav1.APIGroupList{},
&metav1.APIGroup{},
&metav1.APIResourceList{},
)
}
type APIServer struct {
server *genericapiserver.GenericAPIServer
stopCh chan struct{}
aggClient aggregatorclient.Interface
}
func NewAPIServer(clientConfig *rest.Config, coreClient kubernetes.Interface, kcClient kcclient.Interface, globalNamespace string, bindPort int) (*APIServer, error) {
aggClient, err := aggregatorclient.NewForConfig(clientConfig)
if err != nil {
return nil, fmt.Errorf("building aggregation client: %v", err)
}
config, err := newServerConfig(aggClient, bindPort)
if err != nil {
return nil, err
}
server, err := config.Complete().New("kapp-controller-apiserver", genericapiserver.NewEmptyDelegate())
if err != nil {
return nil, err
}
packageMetadatasStorage := packagerest.NewPackageMetadataCRDREST(kcClient, coreClient, globalNamespace)
packageStorage := packagerest.NewPackageCRDREST(kcClient, coreClient, globalNamespace)
pkgGroup := genericapiserver.NewDefaultAPIGroupInfo(datapackaging.GroupName, Scheme, metav1.ParameterCodec, Codecs)
pkgv1alpha1Storage := map[string]apirest.Storage{}
pkgv1alpha1Storage["packagemetadatas"] = packageMetadatasStorage
pkgv1alpha1Storage["Packages"] = packageStorage
pkgGroup.VersionedResourcesStorageMap["v1alpha1"] = pkgv1alpha1Storage
err = server.InstallAPIGroup(&pkgGroup)
if err != nil {
return nil, err
}
return &APIServer{server, make(chan struct{}), aggClient}, nil
}
// Run spawns a go routine that exits when apiserver is stopped.
func (as *APIServer) Run() error {
const (
retries = 60
)
go as.server.PrepareRun().Run(as.stopCh)
for i := 0; i < retries; i++ {
ready, err := as.isReady()
if err != nil {
return fmt.Errorf("checking readiness: %v", err)
}
if ready {
return nil
}
time.Sleep(1 * time.Second)
}
return fmt.Errorf("timed out after %s waiting for api server to become healthy", retries*time.Second)
}
func (as *APIServer) Stop() {
close(as.stopCh)
}
func (as *APIServer) isReady() (bool, error) {
apiService, err := as.aggClient.ApiregistrationV1().APIServices().Get(context.TODO(), apiServiceName, metav1.GetOptions{})
if err != nil {
return false, fmt.Errorf("error getting APIService %s: %v", apiServiceName, err)
}
for _, condition := range apiService.Status.Conditions {
if condition.Type == apiregv1.Available {
return condition.Status == apiregv1.ConditionTrue, nil
}
}
return false, nil
}
func newServerConfig(aggClient aggregatorclient.Interface, bindPort int) (*genericapiserver.RecommendedConfig, error) {
recommendedOptions := genericoptions.NewRecommendedOptions("", Codecs.LegacyCodec(v1alpha1.SchemeGroupVersion))
recommendedOptions.Etcd = nil
// Set the PairName and CertDirectory to generate the certificate files.
recommendedOptions.SecureServing.ServerCert.CertDirectory = selfSignedCertDir
recommendedOptions.SecureServing.ServerCert.PairName = "kapp-controller"
// ports below 1024 are probably the wrong port, see https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers#Well-known_ports
if bindPort < 1024 {
return nil, fmt.Errorf("error initializing API Port to %v - try passing a port above 1023", bindPort)
}
recommendedOptions.SecureServing.BindPort = bindPort
if err := recommendedOptions.SecureServing.MaybeDefaultWithSelfSignedCerts("kapp-controller", []string{apiServiceEndoint()}, []net.IP{net.ParseIP("127.0.0.1")}); err != nil {
return nil, fmt.Errorf("error creating self-signed certificates: %v", err)
}
caContentProvider, err := dynamiccertificates.NewDynamicCAContentFromFile("self-signed cert", recommendedOptions.SecureServing.ServerCert.CertKey.CertFile)
if err != nil {
return nil, fmt.Errorf("error reading self-signed CA certificate: %v", err)
}
if err := updateAPIService(aggClient, caContentProvider); err != nil {
return nil, fmt.Errorf("error updating api service with generated certs: %v", err)
}
serverConfig := genericapiserver.NewRecommendedConfig(Codecs)
if err := recommendedOptions.ApplyTo(serverConfig); err != nil {
return nil, err
}
serverConfig.OpenAPIConfig = genericapiserver.DefaultOpenAPIConfig(
openapi.GetOpenAPIDefinitions,
genericopenapi.NewDefinitionNamer(Scheme))
serverConfig.OpenAPIConfig.Info.Title = "Kapp-controller"
return serverConfig, nil
}
func updateAPIService(client aggregatorclient.Interface, caProvider dynamiccertificates.CAContentProvider) error {
klog.Info("Syncing CA certificate with APIServices")
apiService, err := client.ApiregistrationV1().APIServices().Get(context.TODO(), apiServiceName, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("error getting APIService %s: %v", apiServiceName, err)
}
apiService.Spec.CABundle = caProvider.CurrentCABundleContent()
if _, err := client.ApiregistrationV1().APIServices().Update(context.TODO(), apiService, metav1.UpdateOptions{}); err != nil {
return fmt.Errorf("error updating kapp-controller CA cert of APIService %s: %v", apiServiceName, err)
}
return nil
}
func apiServiceEndoint() string {
var apiServiceName = getEnvVal(kappctrlSVCEnvKey, "packaging-api")
ns := os.Getenv(kappctrlNSEnvKey)
if ns == "" {
panic("Cannot get api service endpoint, Kapp-controller namespace is empty")
}
return fmt.Sprintf("%s.%s.svc", apiServiceName, ns)
}
func getEnvVal(key string, defaultVal string) string {
if value, ok := os.LookupEnv(key); ok {
return value
}
return defaultVal
}