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feat: customize pod informer to reduce memory usage
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| /* | ||
| Copyright 2023 The KubeAdmiral Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package federatedclient | ||
|
|
||
| import ( | ||
| "context" | ||
| "time" | ||
|
|
||
| "golang.org/x/sync/semaphore" | ||
| corev1 "k8s.io/api/core/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/runtime" | ||
| "k8s.io/apimachinery/pkg/watch" | ||
| "k8s.io/client-go/informers" | ||
| kubeclient "k8s.io/client-go/kubernetes" | ||
| "k8s.io/client-go/tools/cache" | ||
| ) | ||
|
|
||
| func addPodInformer(ctx context.Context, | ||
| informer informers.SharedInformerFactory, | ||
| client kubeclient.Interface, | ||
| podListerSemaphore *semaphore.Weighted, | ||
| enablePodPruning bool) { | ||
| informer.InformerFor(&corev1.Pod{}, func(k kubeclient.Interface, resyncPeriod time.Duration) cache.SharedIndexInformer { | ||
| return cache.NewSharedIndexInformer( | ||
| podListerWatcher(ctx, client, podListerSemaphore, enablePodPruning), | ||
| &corev1.Pod{}, | ||
| resyncPeriod, | ||
| cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc}, | ||
| ) | ||
| }) | ||
| } | ||
|
|
||
| func podListerWatcher(ctx context.Context, | ||
| client kubeclient.Interface, | ||
| semaphore *semaphore.Weighted, | ||
| enablePodPruning bool) cache.ListerWatcher { | ||
| return &cache.ListWatch{ | ||
| ListFunc: func(options metav1.ListOptions) (runtime.Object, error) { | ||
| if semaphore != nil { | ||
| if err := semaphore.Acquire(ctx, 1); err != nil { | ||
| return nil, err | ||
| } | ||
| defer semaphore.Release(1) | ||
| } | ||
| pods, err := client.CoreV1().Pods(corev1.NamespaceAll).List(ctx, options) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if enablePodPruning { | ||
| for i := range pods.Items { | ||
| prunePod(&pods.Items[i]) | ||
| } | ||
| } | ||
| return pods, nil | ||
| }, | ||
| WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) { | ||
| watcher, err := client.CoreV1().Pods(corev1.NamespaceAll).Watch(ctx, options) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if !enablePodPruning { | ||
| return watcher, nil | ||
| } | ||
|
|
||
| // It's easy for a consumer to add buffering via an extra | ||
| // goroutine/channel, but impossible for them to remove it, | ||
| // so nonbuffered is better. -- from watch.NewStreamWatcher | ||
| proxyCh := make(chan watch.Event) | ||
| proxyWatcher := watch.NewProxyWatcher(proxyCh) | ||
| go func() { | ||
| defer watcher.Stop() | ||
| // Closing proxyCh will notify the reflector to stop the current | ||
| // watching cycle and then restart the list and watch. | ||
| defer close(proxyCh) | ||
| for { | ||
| select { | ||
| case <-proxyWatcher.StopChan(): | ||
| return | ||
| case event, ok := <-watcher.ResultChan(): | ||
| if !ok { | ||
| // the watcher has been closed, stop the proxy | ||
| return | ||
| } | ||
| if pod, ok := event.Object.(*corev1.Pod); ok { | ||
| prunePod(pod) | ||
| } | ||
| proxyCh <- event | ||
| } | ||
| } | ||
| }() | ||
| return proxyWatcher, nil | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| func prunePod(pod *corev1.Pod) { | ||
| containers := make([]corev1.Container, len(pod.Spec.Containers)) | ||
| initContainers := make([]corev1.Container, len(pod.Spec.InitContainers)) | ||
| for i := range pod.Spec.Containers { | ||
| containers[i] = corev1.Container{Resources: pod.Spec.Containers[i].Resources} | ||
| } | ||
| for i := range pod.Spec.InitContainers { | ||
| initContainers[i] = corev1.Container{Resources: pod.Spec.InitContainers[i].Resources} | ||
| } | ||
| *pod = corev1.Pod{ | ||
| ObjectMeta: metav1.ObjectMeta{ | ||
| Name: pod.Name, | ||
| Namespace: pod.Namespace, | ||
| Generation: pod.Generation, | ||
| ResourceVersion: pod.ResourceVersion, | ||
| UID: pod.UID, | ||
| }, | ||
| Spec: corev1.PodSpec{ | ||
| NodeName: pod.Spec.NodeName, | ||
| Overhead: pod.Spec.Overhead, | ||
| Containers: containers, | ||
| InitContainers: initContainers, | ||
| }, | ||
| } | ||
| } |
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