k8s.io/kubernetes@v1.31.0-alpha.0.0.20240520171757-56147500dadc/cmd/kubemark/app/hollow_node_test.go (about)

     1  /*
     2  Copyright 2023 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 app
    18  
    19  import (
    20  	"fmt"
    21  	"net/http"
    22  	"net/http/httptest"
    23  	"os"
    24  	"path/filepath"
    25  	"testing"
    26  	"time"
    27  
    28  	"k8s.io/kubernetes/test/utils/ktesting"
    29  )
    30  
    31  const fakeKubeconfig = `
    32  apiVersion: v1
    33  kind: Config
    34  clusters:
    35  - cluster:
    36      insecure-skip-tls-verify: true
    37      server: %s
    38    name: default
    39  contexts:
    40  - context:
    41      cluster: default
    42      user: default
    43    name: default
    44  current-context: default
    45  users:
    46  - name: default
    47    user:
    48      username: config
    49  `
    50  
    51  // TestHollowNode is a naive test that attempts to start hollow node and checks if it's not crashing.
    52  // Such test is sufficient to detect e.g. missing kubelet dependencies that are not added in
    53  // pkg/kubemark/hollow_kubelet.go.
    54  func TestHollowNode(t *testing.T) {
    55  	// temp dir
    56  	tmpDir, err := os.MkdirTemp("", "hollow-node")
    57  	if err != nil {
    58  		t.Fatal(err)
    59  	}
    60  	defer os.RemoveAll(tmpDir)
    61  
    62  	// https server
    63  	server := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
    64  		w.WriteHeader(200)
    65  		w.Write([]byte(`ok`))
    66  	}))
    67  	defer server.Close()
    68  
    69  	kubeconfigPath := filepath.Join(tmpDir, "config.kubeconfig")
    70  	if err := os.WriteFile(kubeconfigPath, []byte(fmt.Sprintf(fakeKubeconfig, server.URL)), os.FileMode(0600)); err != nil {
    71  		t.Fatal(err)
    72  	}
    73  
    74  	for morph := range knownMorphs {
    75  		morph := morph
    76  		t.Run(morph, func(t *testing.T) {
    77  			s := &hollowNodeConfig{
    78  				KubeconfigPath: kubeconfigPath,
    79  				Morph:          morph,
    80  			}
    81  			errCh := make(chan error)
    82  			go func() {
    83  				data, err := os.ReadFile(kubeconfigPath)
    84  				t.Logf("read %d, err=%v\n", len(data), err)
    85  				ctx := ktesting.Init(t)
    86  				errCh <- run(ctx, s)
    87  			}()
    88  
    89  			select {
    90  			case err := <-errCh:
    91  				t.Fatalf("Run finished unexpectedly with error: %v", err)
    92  			case <-time.After(3 * time.Second):
    93  				t.Logf("Morph %q hasn't crashed for 3s. Calling success.", morph)
    94  			}
    95  		})
    96  	}
    97  }