/
identified_resources_pods.go
112 lines (90 loc) · 2.84 KB
/
identified_resources_pods.go
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// Copyright 2024 The Carvel Authors.
// SPDX-License-Identifier: Apache-2.0
package resources
import (
"fmt"
"strings"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/client-go/kubernetes"
)
func (r IdentifiedResources) PodResources(labelSelector labels.Selector, resourceNamespaces []string) UniquePodWatcher {
return UniquePodWatcher{labelSelector, uniqAndValidNamespaces(append(r.fallbackAllowedNamespaces, resourceNamespaces...)), r.coreClient}
}
type PodWatcherI interface {
Watch(podsToWatchCh chan corev1.Pod, cancelCh chan struct{}) error
}
type UniquePodWatcher struct {
labelSelector labels.Selector
fallbackAllowedNamespaces []string
coreClient kubernetes.Interface
}
var _ PodWatcherI = UniquePodWatcher{}
func (w UniquePodWatcher) Watch(podsToWatchCh chan corev1.Pod, cancelCh chan struct{}) error {
nonUniquePodsToWatchCh := make(chan corev1.Pod)
go func() {
// Watch Pods in all namespaces first and fallback to the
// fallbackAllowedNamespaces if lack of permission
namespaces := []string{""}
namespaces = append(namespaces, w.fallbackAllowedNamespaces...)
var forbiddenNamespaces []string
for _, namespace := range namespaces {
podWatcher := NewPodWatcher(
w.coreClient.CoreV1().Pods(namespace),
metav1.ListOptions{LabelSelector: w.labelSelector.String()},
)
err := podWatcher.Watch(nonUniquePodsToWatchCh, cancelCh)
if err == nil {
if namespace == "" {
break
}
continue
}
if !errors.IsForbidden(err) {
fmt.Printf("Pod watching error: %s\n", err) // TODO
break
}
if namespace != "" {
forbiddenNamespaces = append(forbiddenNamespaces, fmt.Sprintf(`"%s"`, namespace))
}
}
if len(forbiddenNamespaces) > 0 {
fmt.Printf(`Pod watching error: pods is forbidden: User cannot list resource "pods" in API group "" in the namespace(s) %s`, strings.Join(forbiddenNamespaces, ", "))
}
close(nonUniquePodsToWatchCh)
}()
// Send unique pods to the watcher client
watchedPods := map[string]struct{}{}
for pod := range nonUniquePodsToWatchCh {
podUID := string(pod.UID)
if _, found := watchedPods[podUID]; found {
continue
}
watchedPods[podUID] = struct{}{}
podsToWatchCh <- pod
}
return nil
}
type FilteringPodWatcher struct {
MatcherFunc func(*corev1.Pod) bool
Watcher PodWatcherI
}
var _ PodWatcherI = FilteringPodWatcher{}
func (w FilteringPodWatcher) Watch(podsToWatchCh chan corev1.Pod, cancelCh chan struct{}) error {
filteredCh := make(chan corev1.Pod)
go func() {
err := w.Watcher.Watch(filteredCh, cancelCh)
if err != nil {
fmt.Printf("Pod watching error: %s\n", err) // TODO
}
close(filteredCh)
}()
for pod := range filteredCh {
if w.MatcherFunc(&pod) {
podsToWatchCh <- pod
}
}
return nil
}