/
pod.go
125 lines (98 loc) · 3.06 KB
/
pod.go
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package k8s
import (
"context"
"fmt"
"time"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
watchtools "k8s.io/client-go/tools/watch"
)
const (
podWatchTimeout = 2 * time.Minute
)
func WaitForPod(ctx context.Context, cli kubernetes.Interface, namespace, labelSelector string) (*corev1.Pod, error) {
var result *corev1.Pod
resCli := cli.CoreV1().Pods(namespace)
ctx, cancel := context.WithTimeout(ctx, podWatchTimeout)
defer cancel()
listWatch := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
options.LabelSelector = labelSelector
list, err := resCli.List(ctx, options)
if err != nil {
return nil, fmt.Errorf("failed to list pods: %w", err)
}
return list, nil
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
options.LabelSelector = labelSelector
resWatch, err := resCli.Watch(ctx, options)
if err != nil {
return nil, fmt.Errorf("failed to watch pods: %w", err)
}
return resWatch, nil
},
}
if _, err := watchtools.UntilWithSync(ctx, listWatch, &corev1.Pod{}, nil,
func(event watch.Event) (bool, error) {
res, ok := event.Object.(*corev1.Pod)
if !ok {
return false, fmt.Errorf("unexpected type while watching pods: ns: %s, labelSelector: %s", namespace, labelSelector)
}
phase := res.Status.Phase
if phase != corev1.PodPending {
result = res
return true, nil
}
return false, nil
}); err != nil {
return nil, fmt.Errorf("failed to wait for pod: %w", err)
}
return result, nil
}
func waitForPodTermination(ctx context.Context, cli kubernetes.Interface,
namespace string, name string,
) (*corev1.PodPhase, error) {
var result *corev1.PodPhase
resCli := cli.CoreV1().Pods(namespace)
fieldSelector := fields.OneTermEqualSelector(metav1.ObjectNameField, name).String()
listWatch := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
options.FieldSelector = fieldSelector
list, err := resCli.List(ctx, options)
if err != nil {
return nil, fmt.Errorf("failed to list pods: %w", err)
}
return list, nil
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
options.FieldSelector = fieldSelector
resWatch, err := resCli.Watch(ctx, options)
if err != nil {
return nil, fmt.Errorf("failed to watch pods: %w", err)
}
return resWatch, nil
},
}
if _, err := watchtools.UntilWithSync(ctx, listWatch, &corev1.Pod{}, nil,
func(event watch.Event) (bool, error) {
res, ok := event.Object.(*corev1.Pod)
if !ok {
return false, fmt.Errorf("unexpected type while watching pods: %s/%s", namespace, name)
}
phase := res.Status.Phase
if phase != corev1.PodRunning {
result = &phase
return true, nil
}
return false, nil
}); err != nil {
return nil, fmt.Errorf("failed to wait for pod termination: %w", err)
}
return result, nil
}