testapiserver.go

Documentation: k8s.io/kubernetes/test/utils/apiserver

     1  /*
     2  Copyright 2022 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package apiserver
    18  
    19  import (
    20  	"path"
    21  	"testing"
    22  
    23  	"github.com/google/uuid"
    24  	"k8s.io/apiserver/pkg/server/dynamiccertificates"
    25  	etcdserver "k8s.io/apiserver/pkg/storage/etcd3/testserver"
    26  	"k8s.io/apiserver/pkg/storage/storagebackend"
    27  	clientset "k8s.io/client-go/kubernetes"
    28  	"k8s.io/client-go/rest"
    29  	"k8s.io/client-go/tools/clientcmd"
    30  	"k8s.io/client-go/util/cert"
    31  	kubeapiservertesting "k8s.io/kubernetes/cmd/kube-apiserver/app/testing"
    32  	"k8s.io/kubernetes/test/utils/kubeconfig"
    33  )
    34  
    35  // TestAPIServer provides access to a running apiserver instance.
    36  type TestAPIServer struct {
    37  	// ClientSet is already initialized to access the apiserver as admin.
    38  	ClientSet clientset.Interface
    39  
    40  	// KubeConfigFile is the absolute path for a kube.config file that
    41  	// grants admin access to the apiserver.
    42  	KubeConfigFile string
    43  }
    44  
    45  // StartAPIServer runs etcd and apiserver in the background in the same
    46  // process. All resources get released automatically when the test
    47  // completes. If startup fails, the test gets aborted.
    48  func StartAPITestServer(t *testing.T) TestAPIServer {
    49  	cfg := etcdserver.NewTestConfig(t)
    50  	etcdClient := etcdserver.RunEtcd(t, cfg)
    51  	storageConfig := storagebackend.NewDefaultConfig(path.Join(uuid.New().String(), "registry"), nil)
    52  	storageConfig.Transport.ServerList = etcdClient.Endpoints()
    53  
    54  	server := kubeapiservertesting.StartTestServerOrDie(t, nil, []string{}, storageConfig)
    55  	t.Cleanup(server.TearDownFn)
    56  
    57  	clientSet := clientset.NewForConfigOrDie(server.ClientConfig)
    58  
    59  	kubeConfigFile := writeKubeConfigForWardleServerToKASConnection(t, server.ClientConfig)
    60  
    61  	return TestAPIServer{
    62  		ClientSet:      clientSet,
    63  		KubeConfigFile: kubeConfigFile,
    64  	}
    65  }
    66  
    67  func writeKubeConfigForWardleServerToKASConnection(t *testing.T, kubeClientConfig *rest.Config) string {
    68  	// write a kubeconfig out for starting other API servers with delegated auth.  remember, no in-cluster config
    69  	// the loopback client config uses a loopback cert with different SNI.  We need to use the "real"
    70  	// cert, so we'll hope we aren't hacked during a unit test and instead load it from the server we started.
    71  	wardleToKASKubeClientConfig := rest.CopyConfig(kubeClientConfig)
    72  
    73  	servingCerts, _, err := cert.GetServingCertificatesForURL(wardleToKASKubeClientConfig.Host, "")
    74  	if err != nil {
    75  		t.Fatal(err)
    76  	}
    77  	encodedServing, err := cert.EncodeCertificates(servingCerts...)
    78  	if err != nil {
    79  		t.Fatal(err)
    80  	}
    81  	wardleToKASKubeClientConfig.CAData = encodedServing
    82  
    83  	for _, v := range servingCerts {
    84  		t.Logf("Client: Server public key is %v\n", dynamiccertificates.GetHumanCertDetail(v))
    85  	}
    86  	certs, err := cert.ParseCertsPEM(wardleToKASKubeClientConfig.CAData)
    87  	if err != nil {
    88  		t.Fatal(err)
    89  	}
    90  	for _, curr := range certs {
    91  		t.Logf("CA bundle %v\n", dynamiccertificates.GetHumanCertDetail(curr))
    92  	}
    93  
    94  	adminKubeConfig := kubeconfig.CreateKubeConfig(wardleToKASKubeClientConfig)
    95  	tmpDir := t.TempDir()
    96  	kubeConfigFile := path.Join(tmpDir, "kube.config")
    97  	if err := clientcmd.WriteToFile(*adminKubeConfig, kubeConfigFile); err != nil {
    98  		t.Fatal(err)
    99  	}
   100  
   101  	return kubeConfigFile
   102  }
   103
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