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podstore.go
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podstore.go
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// Copyright 2023 Antrea 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 podstore
import (
"fmt"
"sync"
"time"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
"k8s.io/klog/v2"
"k8s.io/utils/clock"
)
const (
deleteQueueName = "podStorePodsToDelete"
podIPIndex = "PodIP"
delayTime = time.Minute * 5
)
type PodStore struct {
pods cache.Indexer
podsToDelete workqueue.DelayingInterface
// Mapping pod.uuid to podTimestamps
timestampMap map[types.UID]*podTimestamps
clock clock.Clock
mutex sync.RWMutex
}
type podTimestamps struct {
CreationTimestamp time.Time
// DeletionTimestamp is nil if a Pod is not deleted.
DeletionTimestamp *time.Time
}
// Interface is a podStore interface to create local podStore for Flow Exporter and Flow Aggregator.
type Interface interface {
GetPodByIPAndTime(ip string, startTime time.Time) (*corev1.Pod, bool)
Run(stopCh <-chan struct{})
}
// NewPodStoreWithClock creates a Pod Store with a custom clock,
// which is useful when writing robust unit tests.
func NewPodStoreWithClock(podInformer cache.SharedIndexInformer, clock clock.WithTicker) *PodStore {
s := &PodStore{
pods: cache.NewIndexer(podKeyFunc, cache.Indexers{podIPIndex: podIPIndexFunc}),
podsToDelete: workqueue.NewDelayingQueueWithCustomClock(clock, deleteQueueName),
clock: clock,
timestampMap: map[types.UID]*podTimestamps{},
mutex: sync.RWMutex{},
}
podInformer.AddEventHandler(
cache.ResourceEventHandlerFuncs{
AddFunc: s.onPodCreate,
UpdateFunc: s.onPodUpdate,
DeleteFunc: s.onPodDelete,
})
return s
}
func NewPodStore(podInformer cache.SharedIndexInformer) *PodStore {
return NewPodStoreWithClock(podInformer, clock.RealClock{})
}
func (s *PodStore) onPodUpdate(oldObj interface{}, newObj interface{}) {
newPod, ok := newObj.(*corev1.Pod)
if !ok {
klog.ErrorS(nil, "Received unexpected object", "newObj", newObj)
return
}
err := s.pods.Update(newPod)
if err != nil {
klog.ErrorS(err, "Error when updating Pod in index")
return
}
klog.V(4).InfoS("Processed Pod Update Event", "Pod", klog.KObj(newPod))
}
func (s *PodStore) onPodCreate(obj interface{}) {
s.mutex.Lock()
defer s.mutex.Unlock()
timeNow := s.clock.Now()
pod, ok := obj.(*corev1.Pod)
if !ok {
klog.ErrorS(nil, "Received unexpected object", "obj", obj)
return
}
err := s.pods.Add(pod)
if err != nil {
klog.ErrorS(err, "Error when adding Pod to index")
return
}
switch pod.Status.Phase {
case corev1.PodPending:
s.timestampMap[pod.UID] = &podTimestamps{CreationTimestamp: timeNow}
default:
s.timestampMap[pod.UID] = &podTimestamps{CreationTimestamp: pod.CreationTimestamp.Time}
}
klog.V(4).InfoS("Processed Pod Create Event", "Pod", klog.KObj(pod))
}
func (s *PodStore) onPodDelete(obj interface{}) {
s.mutex.Lock()
defer s.mutex.Unlock()
timeNow := s.clock.Now()
pod, ok := obj.(*corev1.Pod)
if !ok {
var err error
pod, err = s.checkDeletedPod(obj)
if err != nil {
klog.ErrorS(err, "Got error while processing Delete Event")
return
}
}
timestamp, ok := s.timestampMap[pod.UID]
if !ok {
klog.ErrorS(nil, "Cannot find podTimestamps in timestampMap", "UID", pod.UID)
return
}
timestamp.DeletionTimestamp = &timeNow
s.podsToDelete.AddAfter(pod, delayTime)
klog.V(4).InfoS("Processed Pod Delete Event", "Pod", klog.KObj(pod))
}
func (s *PodStore) checkDeletedPod(obj interface{}) (*corev1.Pod, error) {
deletedState, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
return nil, fmt.Errorf("received unexpected object: %v", obj)
}
pod, ok := deletedState.Obj.(*corev1.Pod)
if !ok {
return nil, fmt.Errorf("DeletedFinalStateUnknown object is not of type Pod: %v", deletedState.Obj)
}
return pod, nil
}
func (s *PodStore) GetPodByIPAndTime(ip string, time time.Time) (*corev1.Pod, bool) {
s.mutex.RLock()
defer s.mutex.RUnlock()
pods, _ := s.pods.ByIndex(podIPIndex, ip)
if len(pods) == 0 {
return nil, false
} else if len(pods) == 1 {
pod := pods[0].(*corev1.Pod)
// In case the clocks may be skewed between different Nodes in the cluster, we directly return the Pod if there is only
// one Pod in the indexer. Otherwise, we check the timestamp for Pods in the indexer.
klog.V(4).InfoS("Matched Pod IP to Pod from indexer", "ip", ip, "Pod", klog.KObj(pod))
return pod, true
}
for _, pod := range pods {
pod := pod.(*corev1.Pod)
timestamp, ok := s.timestampMap[pod.UID]
if !ok {
continue
}
if timestamp.CreationTimestamp.Before(time) && (timestamp.DeletionTimestamp == nil || time.Before(*timestamp.DeletionTimestamp)) {
klog.V(4).InfoS("Matched Pod IP and time to Pod from indexer", "ip", ip, "time", time, "Pod", klog.KObj(pod))
return pod, true
}
}
return nil, false
}
func (s *PodStore) Run(stopCh <-chan struct{}) {
defer s.podsToDelete.ShutDown()
go wait.Until(s.worker, time.Second, stopCh)
<-stopCh
}
// worker runs a worker thread that just dequeues item from deleteQueue and
// remove the item from prevPod.
func (s *PodStore) worker() {
for s.processDeleteQueueItem() {
}
}
func (s *PodStore) processDeleteQueueItem() bool {
pod, quit := s.podsToDelete.Get()
if quit {
return false
}
s.mutex.Lock()
defer s.mutex.Unlock()
err := s.pods.Delete(pod)
if err != nil {
klog.ErrorS(err, "Error when deleting Pod from deletion workqueue", "Pod", klog.KObj(pod.(*corev1.Pod)))
return false
}
delete(s.timestampMap, pod.(*corev1.Pod).UID)
s.podsToDelete.Done(pod)
klog.V(4).InfoS("Removed Pod from Pod Store", "Pod", klog.KObj(pod.(*corev1.Pod)))
return true
}
func podKeyFunc(obj interface{}) (string, error) {
pod, ok := obj.(*corev1.Pod)
if !ok {
return "", fmt.Errorf("obj is not Pod: %+v", obj)
}
return string(pod.UID), nil
}
func podIPIndexFunc(obj interface{}) ([]string, error) {
pod, ok := obj.(*corev1.Pod)
if !ok {
return nil, fmt.Errorf("obj is not Pod: %+v", obj)
}
if len(pod.Status.PodIPs) > 0 {
indexes := make([]string, len(pod.Status.PodIPs))
for i := range pod.Status.PodIPs {
indexes[i] = pod.Status.PodIPs[i].IP
}
return indexes, nil
}
return nil, nil
}