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Rewrite fetch_target_logs.sh in Golang
Signed-off-by: peppi-lotta <peppi-lotta.saari@est.tech>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,143 @@ | ||
| package e2e | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "flag" | ||
| "io" | ||
| "log" | ||
| "os" | ||
| "os/exec" | ||
| "path/filepath" | ||
|
|
||
| corev1 "k8s.io/api/core/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/client-go/kubernetes" | ||
| "k8s.io/client-go/tools/clientcmd" | ||
| "k8s.io/client-go/util/homedir" | ||
| "k8s.io/kubectl/pkg/describe" | ||
| ) | ||
|
|
||
| func FetchTargetLogs() { | ||
| dirName := "/tmp/target_cluster_logs" | ||
|
|
||
| var kubeconfig *string | ||
| if home := homedir.HomeDir(); home != "" { | ||
| kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file") | ||
| } else { | ||
| kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file") | ||
| } | ||
| flag.Parse() | ||
|
|
||
| // use the current context in kubeconfig | ||
| config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig) | ||
| if err != nil { | ||
| log.Printf("Error building kubeconfig: %v", err) | ||
| } | ||
|
|
||
| // create the clientset | ||
| clientset, err := kubernetes.NewForConfig(config) | ||
| if err != nil { | ||
| log.Printf("Error creating clientset: %v", err) | ||
| } | ||
|
|
||
| // Print the Pods' information to file | ||
| // This does the same thing as: | ||
| // kubectl --kubeconfig="${KUBECONFIG_WORKLOAD}" get pods -A | ||
| out, err := exec.Command("kubectl", "get", "pods", "-A").Output() | ||
| if err != nil { | ||
| log.Printf("Error in getting pods: %v", err) | ||
| } | ||
| file := filepath.Join(dirName, "pods.log") | ||
| err = os.WriteFile(file, out, 0644) | ||
| if err != nil { | ||
| log.Printf("Error in writing to file: %v", err) | ||
| } | ||
|
|
||
| // Get all namespaces | ||
| namespaces, err := clientset.CoreV1().Namespaces().List(context.Background(), metav1.ListOptions{}) | ||
| if err != nil { | ||
| log.Printf("Error in getting namespaces: %v", err) | ||
| } | ||
| for _, namespace := range namespaces.Items { | ||
| namespaceDir := filepath.Join(dirName, namespace.Name) | ||
|
|
||
| // Get all pods in the namespace | ||
| pods, err := clientset.CoreV1().Pods(namespace.Name).List(context.Background(), metav1.ListOptions{}) | ||
| if err != nil { | ||
| log.Printf("Error listing pods in namespace %s: %v", namespace.Name, err) | ||
| } | ||
| for _, pod := range pods.Items { | ||
| // Create a directory for each pod and the path to it if | ||
| // it does not exist | ||
| podDir := filepath.Join(namespaceDir, pod.Name) | ||
| err = os.MkdirAll(podDir, 0775) | ||
| if err != nil { | ||
| log.Printf("Error in writing to file: %v", err) | ||
| } | ||
|
|
||
| // Get detailed information about the Pod | ||
| // This does the same thing as: | ||
| // kubectl --kubeconfig="${KUBECONFIG_WORKLOAD}" describe pods -n "${NAMESPACE}" "${POD}" | ||
| describerSettings := describe.DescriberSettings{ | ||
| ShowEvents: true, | ||
| } | ||
| podDescriber := describe.PodDescriber{ | ||
| Interface: clientset, | ||
| } | ||
| podDescription, err := podDescriber.Describe(namespace.Name, pod.Name, describerSettings) | ||
| if err != nil { | ||
| log.Printf("Error in describing pod %s in namespace %s: %v", pod.Name, namespace.Name, err) | ||
| } | ||
|
|
||
| // Print the Pod information to file | ||
| file := filepath.Join(podDir, "stdout_describe.log") | ||
| err = os.WriteFile(file, []byte(podDescription), 0644) | ||
| if err != nil { | ||
| log.Printf("Error in writing to file: %v", err) | ||
| } | ||
|
|
||
| // Get containers of the Pod | ||
| for _, container := range pod.Spec.Containers { | ||
| // Create a directory for each container | ||
| containerDir := filepath.Join(podDir, container.Name) | ||
| err = os.MkdirAll(containerDir, 0775) | ||
| if err != nil { | ||
| log.Printf("Error listing to containers: %v", err) | ||
| } | ||
|
|
||
| containerLogs := GetContainerLogs(namespace.Name, pod.Name, container.Name, clientset) | ||
| // Print the Pod information to file | ||
| file := filepath.Join(containerDir, "stdout.log") | ||
| err = os.WriteFile(file, []byte(containerLogs), 0644) | ||
| if err != nil { | ||
| log.Printf("Error in writing to file: %v", err) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func GetContainerLogs(namespace string, podName string, containerName string, clientset *kubernetes.Clientset) string { | ||
| // Get logs of a container | ||
| // Does the same thing as: | ||
| // kubectl --kubeconfig="${KUBECONFIG_WORKLOAD}" logs -n "${NAMESPACE}" "${POD}" "${CONTAINER}" | ||
| podLogOptions := corev1.PodLogOptions{ | ||
| Container: containerName, | ||
| } | ||
| podLogs, err := clientset.CoreV1().Pods(namespace).GetLogs(podName, &podLogOptions).Stream(context.Background()) | ||
| if err != nil { | ||
| log.Printf("Error getting container logs: %v", err) | ||
| } | ||
| defer podLogs.Close() | ||
|
|
||
| // Read the logs into a string | ||
| buf := new(bytes.Buffer) | ||
| _, err = io.Copy(buf, podLogs) | ||
| if err != nil { | ||
| log.Printf("Error in buffering container logs: %v", err) | ||
| } | ||
| podStr := buf.String() | ||
|
|
||
| return podStr | ||
| } |
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