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/* | ||
Copyright 2023 The Kubernetes Authors All rights reserved. | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this file except in compliance with the License. | ||
You may obtain a copy of the License at | ||
http://www.apache.org/licenses/LICENSE-2.0 | ||
Unless required by applicable law or agreed to in writing, software | ||
distributed under the License is distributed on an "AS IS" BASIS, | ||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
See the License for the specific language governing permissions and | ||
limitations under the License. | ||
*/ | ||
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package e2e | ||
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import ( | ||
"context" | ||
"io" | ||
"net" | ||
"os" | ||
"os/exec" | ||
"path/filepath" | ||
"testing" | ||
"time" | ||
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"k8s.io/apimachinery/pkg/util/wait" | ||
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"k8s.io/kube-state-metrics/v2/internal" | ||
"k8s.io/kube-state-metrics/v2/pkg/options" | ||
) | ||
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func TestKubeConfigHotReload(t *testing.T) { | ||
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// Initialise options. | ||
opts := options.NewOptions() | ||
cmd := options.InitCommand | ||
opts.AddFlags(cmd) | ||
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// Open kubeconfig | ||
originalKubeconfig := os.Getenv("KUBECONFIG") | ||
if originalKubeconfig == "" { | ||
// Assume $HOME is always defined. | ||
originalKubeconfig = os.Getenv("HOME") + "/.kube/config" | ||
} | ||
originalKubeconfigFp, err := os.Open(filepath.Clean(originalKubeconfig)) | ||
if err != nil { | ||
t.Fatalf("failed to open kubeconfig: %v", err) | ||
} | ||
defer originalKubeconfigFp.Close() | ||
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// Create temporal kubeconfig based on original one | ||
kubeconfigFp, err := os.CreateTemp("", "ksm-hot-reload-kubeconfig") | ||
if err != nil { | ||
t.Fatalf("failed to create temporal kubeconfig: %v", err) | ||
} | ||
defer os.Remove(kubeconfigFp.Name()) | ||
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if _, err := io.Copy(kubeconfigFp, originalKubeconfigFp); err != nil { | ||
t.Fatalf("failed to copy from original kubeconfig to new one: %v", err) | ||
} | ||
kubeconfig := kubeconfigFp.Name() | ||
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opts.Kubeconfig = kubeconfig | ||
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// Run general validation on options. | ||
if err := opts.Parse(); err != nil { | ||
t.Fatalf("failed to parse options: %v", err) | ||
} | ||
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// Make the process asynchronous. | ||
go internal.RunKubeStateMetricsWrapper(opts) | ||
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// Wait for port 8080 to come up. | ||
err = wait.PollUntilContextTimeout(context.TODO(), 1*time.Second, 20*time.Second, true, func(ctx context.Context) (bool, error) { | ||
conn, err := net.Dial("tcp", "localhost:8080") | ||
if err != nil { | ||
return false, nil | ||
} | ||
err = conn.Close() | ||
if err != nil { | ||
return false, err | ||
} | ||
return true, nil | ||
}) | ||
if err != nil { | ||
t.Fatalf("failed to wait for port 8080 to come up for the first time: %v", err) | ||
} | ||
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// Modify config to trigger hot reload. | ||
err = exec.Command("kubectl", "config", "set-cluster", "ksm-hot-reload-kubeconfig-test", "--kubeconfig", kubeconfig).Run() //nolint:gosec | ||
if err != nil { | ||
t.Fatalf("failed to modify kubeconfig: %v", err) | ||
} | ||
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// Revert kubeconfig to original one. | ||
defer func() { | ||
err := exec.Command("kubectl", "config", "delete-cluster", "ksm-hot-reload-kubeconfig-test", "--kubeconfig", kubeconfig).Run() //nolint:gosec | ||
if err != nil { | ||
t.Fatalf("failed to revert kubeconfig: %v", err) | ||
} | ||
}() | ||
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// Wait for new kubeconfig to be reloaded. | ||
time.Sleep(5 * time.Second) | ||
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// Wait for port 8080 to come up. | ||
ch := make(chan bool, 1) | ||
err = wait.PollUntilContextTimeout(context.TODO(), 1*time.Second, 20*time.Second, true, func(ctx context.Context) (bool, error) { | ||
conn, err := net.Dial("tcp", "localhost:8080") | ||
if err != nil { | ||
return false, nil | ||
} | ||
err = conn.Close() | ||
if err != nil { | ||
return false, err | ||
} | ||
// Indicate that the test has passed. | ||
ch <- true | ||
return true, nil | ||
}) | ||
if err != nil { | ||
t.Fatalf("failed to wait for port 8080 to come up after restarting the process: %v", err) | ||
} | ||
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// Wait for process to exit. | ||
select { | ||
case <-ch: | ||
t.Log("test passed successfully") | ||
case <-time.After(20 * time.Second): | ||
t.Fatal("timed out waiting for test to pass, check the logs for more info") | ||
} | ||
} |