AAP-46484 Capture k8s pod diagnostics #1332
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -29,4 +29,5 @@ venv | |
| /vendor | ||
| pkg/services/.lock | ||
| pkg/workceptor/status | ||
| pkg/workceptor/status.lock | ||
| **/__debug_* | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| package workceptor | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
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| corev1 "k8s.io/api/core/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/watch" | ||
| "k8s.io/client-go/kubernetes" | ||
| ) | ||
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| type KubePodStateHelper interface { | ||
| GetPodStatus(pod *corev1.Pod) (bool, error) | ||
| PodContainerHealthy(pod *corev1.Pod, containerName string) (bool, error) | ||
| PodHealthy(pod *corev1.Pod, containerName string) (bool, error) | ||
| WaitForPodCompleted(pod *corev1.Pod, clientset kubernetes.Interface, timeoutSeconds *int64) (*corev1.Pod, error) | ||
| } | ||
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| // GetPodStatus checks if the pod has successfully completed its application logic and infrastructure is healthy. | ||
| func (kw KubeUnit) GetPodStatus(pod *corev1.Pod) (bool, error) { | ||
| if pod == nil { | ||
| return false, fmt.Errorf("pod is nil") | ||
| } | ||
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| ok, err := kw.PodHealthy(pod, containerName) | ||
| if !ok || err != nil { | ||
| return ok, err | ||
| } | ||
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| return ok, nil | ||
| } | ||
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| // PodContainerHealthy checks if the pod has successfully completed its application logic. | ||
| // this is called after podInfrastructureSuccess has confirmed the pod is in a terminal state. | ||
| func (kw KubeUnit) PodContainerHealthy(pod *corev1.Pod, containerName string) (bool, error) { | ||
| if pod == nil { | ||
| return false, fmt.Errorf("pod is nil") | ||
| } | ||
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| for _, cs := range pod.Status.ContainerStatuses { | ||
| if cs.Name == containerName { | ||
| if cs.State.Terminated == nil { // means it is waiting or running, so application logic has not completed yet. Normal behavior when job completes successfully. | ||
| return true, nil | ||
| } | ||
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| if cs.State.Terminated.ExitCode != 0 { // exit code of 0 means success | ||
| return false, fmt.Errorf("container %s exited with code %d: %s", cs.Name, cs.State.Terminated.ExitCode, cs.State.Terminated.Reason) | ||
| } | ||
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| return true, nil // container terminated with exit code of 0 | ||
| } | ||
| } | ||
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| return false, fmt.Errorf("pod does not contain container %s", containerName) | ||
| } | ||
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| // PodInfrastructureSuccess checks if the pod has either successfully started, is pending or is running, or has is successfully terminated. | ||
| // Any other state is considered an infrastructure failure. | ||
| func (kw KubeUnit) PodHealthy(pod *corev1.Pod, containerName string) (bool, error) { | ||
| if pod == nil { | ||
| return false, fmt.Errorf("pod is nil") | ||
| } | ||
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| for _, cs := range pod.Status.ContainerStatuses { | ||
| // Check if this is the container we care about first | ||
| if cs.Name == containerName { | ||
| switch pod.Status.Phase { | ||
| case corev1.PodFailed: | ||
| ok, err := kw.PodContainerHealthy(pod, containerName) | ||
| if !ok || err != nil { | ||
| return false, err | ||
| } | ||
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| return true, nil | ||
| case corev1.PodSucceeded: | ||
| return true, nil | ||
| case corev1.PodRunning, corev1.PodPending: | ||
| return true, nil | ||
| default: | ||
| return false, fmt.Errorf("unknown phase: %s", pod.Status.Phase) | ||
| } | ||
| } | ||
| } | ||
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| return false, fmt.Errorf("pod does not contain container %s", containerName) | ||
| } | ||
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| func (kw KubeUnit) WaitForPodCompleted(ctx context.Context, pod *corev1.Pod, clientset kubernetes.Interface, timeoutSeconds *int64) (*corev1.Pod, error) { | ||
| if pod == nil { | ||
| return nil, fmt.Errorf("pod is nil") | ||
| } | ||
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| originalPhase := pod.Status.Phase | ||
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| watcher, err := clientset.CoreV1().Pods(pod.Namespace).Watch(ctx, metav1.ListOptions{ | ||
| TimeoutSeconds: timeoutSeconds, | ||
| FieldSelector: "involvedObject.kind=Pod,involvedObject.name=" + pod.Name, | ||
| }) | ||
| if err != nil { | ||
| return pod, err | ||
| } | ||
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| for event := range watcher.ResultChan() { | ||
| switch event.Type { | ||
| case watch.Error: | ||
| kw.GetWorkceptor().nc.GetLogger().Debug("Pod %s/%s event %s phase %s (error)", pod.Namespace, pod.Name, event.Type, pod.Status.Phase) | ||
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| return pod, event.Object.(error) | ||
| default: | ||
| pod = event.Object.(*corev1.Pod) | ||
| if pod.Status.Phase != originalPhase { | ||
| kw.GetWorkceptor().nc.GetLogger().Debug("Pod %s/%s phase changed from %s to %s", pod.Namespace, pod.Name, originalPhase, pod.Status.Phase) | ||
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| return pod, nil | ||
| } | ||
| kw.GetWorkceptor().nc.GetLogger().Debug("Pod %s/%s event %s phase %s (no change)", pod.Namespace, pod.Name, event.Type, pod.Status.Phase) | ||
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| return pod, nil | ||
| } | ||
| } | ||
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| kw.GetWorkceptor().nc.GetLogger().Debug("Pod %s/%s phase %s timeout (no change)", pod.Namespace, pod.Name, pod.Status.Phase) | ||
|
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| return pod, nil | ||
| } |
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