/
kubesharkTapperSyncer.go
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/
kubesharkTapperSyncer.go
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package kubernetes
import (
"context"
"fmt"
"regexp"
"time"
"github.com/kubeshark/kubeshark/logger"
"github.com/kubeshark/kubeshark/shared"
"github.com/kubeshark/kubeshark/shared/debounce"
"github.com/kubeshark/worker/api"
"github.com/op/go-logging"
core "k8s.io/api/core/v1"
)
const updateTappersDelay = 5 * time.Second
type TappedPodChangeEvent struct {
Added []core.Pod
Removed []core.Pod
}
// KubesharkTapperSyncer uses a k8s pod watch to update tapper daemonsets when targeted pods are removed or created
type KubesharkTapperSyncer struct {
startTime time.Time
context context.Context
CurrentlyTappedPods []core.Pod
config TapperSyncerConfig
kubernetesProvider *Provider
TapPodChangesOut chan TappedPodChangeEvent
TapperStatusChangedOut chan shared.TapperStatus
ErrorOut chan K8sTapManagerError
nodeToTappedPodMap shared.NodeToPodsMap
tappedNodes []string
}
type TapperSyncerConfig struct {
TargetNamespaces []string
PodFilterRegex regexp.Regexp
KubesharkResourcesNamespace string
AgentImage string
TapperResources shared.Resources
ImagePullPolicy core.PullPolicy
LogLevel logging.Level
KubesharkApiFilteringOptions api.TrafficFilteringOptions
KubesharkServiceAccountExists bool
ServiceMesh bool
Tls bool
MaxLiveStreams int
}
func CreateAndStartKubesharkTapperSyncer(ctx context.Context, kubernetesProvider *Provider, config TapperSyncerConfig, startTime time.Time) (*KubesharkTapperSyncer, error) {
syncer := &KubesharkTapperSyncer{
startTime: startTime.Truncate(time.Second), // Round down because k8s CreationTimestamp is given in 1 sec resolution.
context: ctx,
CurrentlyTappedPods: make([]core.Pod, 0),
config: config,
kubernetesProvider: kubernetesProvider,
TapPodChangesOut: make(chan TappedPodChangeEvent, 100),
TapperStatusChangedOut: make(chan shared.TapperStatus, 100),
ErrorOut: make(chan K8sTapManagerError, 100),
}
if err, _ := syncer.updateCurrentlyTappedPods(); err != nil {
return nil, err
}
if err := syncer.updateKubesharkTappers(); err != nil {
return nil, err
}
go syncer.watchPodsForTapping()
go syncer.watchTapperEvents()
go syncer.watchTapperPods()
return syncer, nil
}
func (tapperSyncer *KubesharkTapperSyncer) watchTapperPods() {
kubesharkResourceRegex := regexp.MustCompile(fmt.Sprintf("^%s.*", TapperPodName))
podWatchHelper := NewPodWatchHelper(tapperSyncer.kubernetesProvider, kubesharkResourceRegex)
eventChan, errorChan := FilteredWatch(tapperSyncer.context, podWatchHelper, []string{tapperSyncer.config.KubesharkResourcesNamespace}, podWatchHelper)
for {
select {
case wEvent, ok := <-eventChan:
if !ok {
eventChan = nil
continue
}
pod, err := wEvent.ToPod()
if err != nil {
logger.Log.Debugf("[ERROR] parsing Kubeshark resource pod: %+v", err)
continue
}
logger.Log.Debugf("Watching tapper pods loop, tapper: %v, node: %v, status: %v", pod.Name, pod.Spec.NodeName, pod.Status.Phase)
if pod.Spec.NodeName != "" {
tapperStatus := shared.TapperStatus{TapperName: pod.Name, NodeName: pod.Spec.NodeName, Status: string(pod.Status.Phase)}
tapperSyncer.TapperStatusChangedOut <- tapperStatus
}
case err, ok := <-errorChan:
if !ok {
errorChan = nil
continue
}
logger.Log.Debugf("[ERROR] Watching tapper pods loop, error: %+v", err)
case <-tapperSyncer.context.Done():
logger.Log.Debugf("Watching tapper pods loop, ctx done")
return
}
}
}
func (tapperSyncer *KubesharkTapperSyncer) watchTapperEvents() {
kubesharkResourceRegex := regexp.MustCompile(fmt.Sprintf("^%s.*", TapperPodName))
eventWatchHelper := NewEventWatchHelper(tapperSyncer.kubernetesProvider, kubesharkResourceRegex, "pod")
eventChan, errorChan := FilteredWatch(tapperSyncer.context, eventWatchHelper, []string{tapperSyncer.config.KubesharkResourcesNamespace}, eventWatchHelper)
for {
select {
case wEvent, ok := <-eventChan:
if !ok {
eventChan = nil
continue
}
event, err := wEvent.ToEvent()
if err != nil {
logger.Log.Debugf("[ERROR] parsing Kubeshark resource event: %+v", err)
continue
}
logger.Log.Debugf(
fmt.Sprintf("Watching tapper events loop, event %s, time: %v, resource: %s (%s), reason: %s, note: %s",
event.Name,
event.CreationTimestamp.Time,
event.Regarding.Name,
event.Regarding.Kind,
event.Reason,
event.Note))
pod, err1 := tapperSyncer.kubernetesProvider.GetPod(tapperSyncer.context, tapperSyncer.config.KubesharkResourcesNamespace, event.Regarding.Name)
if err1 != nil {
logger.Log.Debugf(fmt.Sprintf("Couldn't get tapper pod %s", event.Regarding.Name))
continue
}
nodeName := ""
if event.Reason != "FailedScheduling" {
nodeName = pod.Spec.NodeName
} else {
nodeName = pod.Spec.Affinity.NodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution.NodeSelectorTerms[0].MatchFields[0].Values[0]
}
tapperStatus := shared.TapperStatus{TapperName: pod.Name, NodeName: nodeName, Status: string(pod.Status.Phase)}
tapperSyncer.TapperStatusChangedOut <- tapperStatus
case err, ok := <-errorChan:
if !ok {
errorChan = nil
continue
}
logger.Log.Debugf("[ERROR] Watching tapper events loop, error: %+v", err)
case <-tapperSyncer.context.Done():
logger.Log.Debugf("Watching tapper events loop, ctx done")
return
}
}
}
func (tapperSyncer *KubesharkTapperSyncer) watchPodsForTapping() {
podWatchHelper := NewPodWatchHelper(tapperSyncer.kubernetesProvider, &tapperSyncer.config.PodFilterRegex)
eventChan, errorChan := FilteredWatch(tapperSyncer.context, podWatchHelper, tapperSyncer.config.TargetNamespaces, podWatchHelper)
handleChangeInPods := func() {
err, changeFound := tapperSyncer.updateCurrentlyTappedPods()
if err != nil {
tapperSyncer.ErrorOut <- K8sTapManagerError{
OriginalError: err,
TapManagerReason: TapManagerPodListError,
}
}
if !changeFound {
logger.Log.Debugf("Nothing changed update tappers not needed")
return
}
if err := tapperSyncer.updateKubesharkTappers(); err != nil {
tapperSyncer.ErrorOut <- K8sTapManagerError{
OriginalError: err,
TapManagerReason: TapManagerTapperUpdateError,
}
}
}
restartTappersDebouncer := debounce.NewDebouncer(updateTappersDelay, handleChangeInPods)
for {
select {
case wEvent, ok := <-eventChan:
if !ok {
eventChan = nil
continue
}
pod, err := wEvent.ToPod()
if err != nil {
tapperSyncer.handleErrorInWatchLoop(err, restartTappersDebouncer)
continue
}
switch wEvent.Type {
case EventAdded:
logger.Log.Debugf("Added matching pod %s, ns: %s", pod.Name, pod.Namespace)
if err := restartTappersDebouncer.SetOn(); err != nil {
logger.Log.Error(err)
}
case EventDeleted:
logger.Log.Debugf("Removed matching pod %s, ns: %s", pod.Name, pod.Namespace)
if err := restartTappersDebouncer.SetOn(); err != nil {
logger.Log.Error(err)
}
case EventModified:
logger.Log.Debugf("Modified matching pod %s, ns: %s, phase: %s, ip: %s", pod.Name, pod.Namespace, pod.Status.Phase, pod.Status.PodIP)
// Act only if the modified pod has already obtained an IP address.
// After filtering for IPs, on a normal pod restart this includes the following events:
// - Pod deletion
// - Pod reaches start state
// - Pod reaches ready state
// Ready/unready transitions might also trigger this event.
if pod.Status.PodIP != "" {
if err := restartTappersDebouncer.SetOn(); err != nil {
logger.Log.Error(err)
}
}
case EventBookmark:
break
case EventError:
break
}
case err, ok := <-errorChan:
if !ok {
errorChan = nil
continue
}
tapperSyncer.handleErrorInWatchLoop(err, restartTappersDebouncer)
continue
case <-tapperSyncer.context.Done():
logger.Log.Debugf("Watching pods loop, context done, stopping `restart tappers debouncer`")
restartTappersDebouncer.Cancel()
// TODO: Does this also perform cleanup?
return
}
}
}
func (tapperSyncer *KubesharkTapperSyncer) handleErrorInWatchLoop(err error, restartTappersDebouncer *debounce.Debouncer) {
logger.Log.Debugf("Watching pods loop, got error %v, stopping `restart tappers debouncer`", err)
restartTappersDebouncer.Cancel()
tapperSyncer.ErrorOut <- K8sTapManagerError{
OriginalError: err,
TapManagerReason: TapManagerPodWatchError,
}
}
func (tapperSyncer *KubesharkTapperSyncer) updateCurrentlyTappedPods() (err error, changesFound bool) {
if matchingPods, err := tapperSyncer.kubernetesProvider.ListAllRunningPodsMatchingRegex(tapperSyncer.context, &tapperSyncer.config.PodFilterRegex, tapperSyncer.config.TargetNamespaces); err != nil {
return err, false
} else {
podsToTap := excludeKubesharkPods(matchingPods)
addedPods, removedPods := getPodArrayDiff(tapperSyncer.CurrentlyTappedPods, podsToTap)
for _, addedPod := range addedPods {
logger.Log.Debugf("tapping new pod %s", addedPod.Name)
}
for _, removedPod := range removedPods {
logger.Log.Debugf("pod %s is no longer running, tapping for it stopped", removedPod.Name)
}
if len(addedPods) > 0 || len(removedPods) > 0 {
tapperSyncer.CurrentlyTappedPods = podsToTap
tapperSyncer.nodeToTappedPodMap = GetNodeHostToTappedPodsMap(tapperSyncer.CurrentlyTappedPods)
tapperSyncer.TapPodChangesOut <- TappedPodChangeEvent{
Added: addedPods,
Removed: removedPods,
}
return nil, true
}
return nil, false
}
}
func (tapperSyncer *KubesharkTapperSyncer) updateKubesharkTappers() error {
nodesToTap := make([]string, len(tapperSyncer.nodeToTappedPodMap))
i := 0
for node := range tapperSyncer.nodeToTappedPodMap {
nodesToTap[i] = node
i++
}
if shared.EqualStringSlices(nodesToTap, tapperSyncer.tappedNodes) {
logger.Log.Debug("Skipping apply, DaemonSet is up to date")
return nil
}
logger.Log.Debugf("Updating DaemonSet to run on nodes: %v", nodesToTap)
if len(tapperSyncer.nodeToTappedPodMap) > 0 {
var serviceAccountName string
if tapperSyncer.config.KubesharkServiceAccountExists {
serviceAccountName = ServiceAccountName
} else {
serviceAccountName = ""
}
nodeNames := make([]string, 0, len(tapperSyncer.nodeToTappedPodMap))
for nodeName := range tapperSyncer.nodeToTappedPodMap {
nodeNames = append(nodeNames, nodeName)
}
if err := tapperSyncer.kubernetesProvider.ApplyKubesharkTapperDaemonSet(
tapperSyncer.context,
tapperSyncer.config.KubesharkResourcesNamespace,
TapperDaemonSetName,
"kubeshark/worker:test-amd64",
TapperPodName,
fmt.Sprintf("%s.%s.svc", ApiServerPodName, tapperSyncer.config.KubesharkResourcesNamespace),
nodeNames,
serviceAccountName,
tapperSyncer.config.TapperResources,
tapperSyncer.config.ImagePullPolicy,
tapperSyncer.config.KubesharkApiFilteringOptions,
tapperSyncer.config.LogLevel,
tapperSyncer.config.ServiceMesh,
tapperSyncer.config.Tls,
tapperSyncer.config.MaxLiveStreams); err != nil {
return err
}
logger.Log.Debugf("Successfully created %v tappers", len(tapperSyncer.nodeToTappedPodMap))
} else {
if err := tapperSyncer.kubernetesProvider.ResetKubesharkTapperDaemonSet(
tapperSyncer.context,
tapperSyncer.config.KubesharkResourcesNamespace,
TapperDaemonSetName,
tapperSyncer.config.AgentImage,
TapperPodName); err != nil {
return err
}
logger.Log.Debugf("Successfully reset tapper daemon set")
}
tapperSyncer.tappedNodes = nodesToTap
return nil
}