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podwaiter.go
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podwaiter.go
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// Copyright 2022 Namespace Labs Inc; 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.
package kubeobserver
import (
"context"
"fmt"
"sync"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
k8s "k8s.io/client-go/kubernetes"
"namespacelabs.dev/foundation/framework/kubernetes/kubedef"
"namespacelabs.dev/foundation/internal/runtime"
"namespacelabs.dev/foundation/std/tasks"
)
type podWaiter struct {
namespace string
selector metav1.ListOptions
isOk func(corev1.PodStatus) (bool, error)
mu sync.Mutex
podCount, matchCount int
}
// FormatProgress implements ActionProgress.
func (w *podWaiter) FormatProgress() string {
w.mu.Lock()
defer w.mu.Unlock()
if w.podCount == 0 {
return "(waiting for pods...)"
}
return fmt.Sprintf("%d / %d", w.matchCount, w.podCount)
}
func (w *podWaiter) Prepare(ctx context.Context, c *k8s.Clientset) error {
tasks.Attachments(ctx).SetProgress(w)
return nil
}
func (w *podWaiter) Poll(ctx context.Context, c *k8s.Clientset) (bool, error) {
list, err := c.CoreV1().Pods(w.namespace).List(ctx, w.selector)
if err != nil {
return false, err
}
var count int
for _, pod := range list.Items {
// If the pod is configured to never restart, we check if it's in an unrecoverable state.
if pod.Spec.RestartPolicy == corev1.RestartPolicyNever {
var failures []runtime.ErrContainerFailed_Failure
for _, init := range pod.Status.InitContainerStatuses {
if init.State.Terminated != nil && init.State.Terminated.ExitCode != 0 {
failures = append(failures, runtime.ErrContainerFailed_Failure{
Reference: kubedef.MakePodRef(pod.Namespace, pod.Name, init.Name, nil),
Reason: init.State.Terminated.Reason,
Message: init.State.Terminated.Message,
ExitCode: init.State.Terminated.ExitCode,
})
}
}
for _, container := range pod.Status.ContainerStatuses {
if container.State.Terminated != nil && container.State.Terminated.ExitCode != 0 {
failures = append(failures, runtime.ErrContainerFailed_Failure{
Reference: kubedef.MakePodRef(pod.Namespace, pod.Name, container.Name, nil),
Reason: container.State.Terminated.Reason,
Message: container.State.Terminated.Message,
ExitCode: container.State.Terminated.ExitCode,
})
}
}
if len(failures) > 0 {
return false, runtime.ErrContainerFailed{
Name: fmt.Sprintf("%s/%s", pod.Namespace, pod.Name),
Failures: failures,
}
}
}
ok, err := w.isOk(pod.Status)
if err != nil {
return false, err
}
if ok {
count++
break // Don't overcount.
}
}
w.mu.Lock()
defer w.mu.Unlock()
w.podCount = len(list.Items)
w.matchCount = count
return w.matchCount > 0 && w.matchCount == w.podCount, nil
}
func WaitForPodConditition(namespace string, selector metav1.ListOptions, isOk func(corev1.PodStatus) (bool, error)) ConditionWaiter[*k8s.Clientset] {
return NewPodCondititionWaiter(namespace, selector, isOk)
}
func NewPodCondititionWaiter(namespace string, selector metav1.ListOptions, isOk func(corev1.PodStatus) (bool, error)) *podWaiter {
return &podWaiter{namespace: namespace, selector: selector, isOk: isOk}
}
func MatchPodCondition(typ corev1.PodConditionType) func(corev1.PodStatus) (bool, error) {
return func(ps corev1.PodStatus) (bool, error) {
return matchPodCondition(ps, typ), nil
}
}
func matchPodCondition(ps corev1.PodStatus, typ corev1.PodConditionType) bool {
for _, cond := range ps.Conditions {
if cond.Type == typ && cond.Status == corev1.ConditionTrue {
return true
}
}
return false
}