/
scanner_listener.go
116 lines (99 loc) · 2.37 KB
/
scanner_listener.go
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package scalar2
import (
"encoding/json"
"sync"
"time"
"github.com/MagalixCorp/magalix-agent/v2/kuber"
"github.com/MagalixTechnologies/core/logger"
"github.com/reconquest/karma-go"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
corev1 "k8s.io/api/core/v1"
)
type PodProcessor interface {
Submit(pod corev1.Pod) error
}
type ScannerListener struct {
observer *kuber.Observer
podsWatcher kuber.Watcher
podsChan chan corev1.Pod
plMutex sync.Mutex
podsListeners []PodProcessor
}
func NewScannerListener(
observer_ *kuber.Observer,
) *ScannerListener {
return &ScannerListener{
observer: observer_,
podsChan: make(chan corev1.Pod, 0),
plMutex: sync.Mutex{},
}
}
func (sl *ScannerListener) Start() {
go sl.processPods()
sl.podsWatcher = sl.observer.Watch(kuber.Pods)
sl.podsWatcher.AddEventHandler(
&kuber.ResourceEventHandlerFuncs{
Observer: sl.observer,
AddFunc: func(now time.Time, gvrk kuber.GroupVersionResourceKind, obj unstructured.Unstructured) {
sl.handleUnstructuredPod(&obj)
},
UpdateFunc: func(now time.Time, gvrk kuber.GroupVersionResourceKind, oldObj, newObj unstructured.Unstructured) {
sl.handleUnstructuredPod(&newObj)
},
},
)
}
func (sl *ScannerListener) Stop() {
close(sl.podsChan)
// TODO: we may need to find a method to remove the EventHandler
}
func (sl *ScannerListener) handleUnstructuredPod(u *unstructured.Unstructured) {
var pod corev1.Pod
err := transcodeUnstructured(u, &pod)
if err != nil {
logger.Errorw(
"unable to decode Unstructured to corev1.Pod",
"error", err,
)
}
sl.podsChan <- pod
}
func (sl *ScannerListener) AddPodListener(processor PodProcessor) {
sl.plMutex.Lock()
defer sl.plMutex.Unlock()
sl.podsListeners = append(sl.podsListeners, processor)
}
func (sl *ScannerListener) processPods() {
for pod := range sl.podsChan {
for _, listener := range sl.podsListeners {
err := listener.Submit(pod)
if err != nil {
logger.Errorw(
"error submitting pod to listener",
"error", err,
)
}
}
}
}
func transcodeUnstructured(
u *unstructured.Unstructured,
v interface{},
) error {
b, err := u.MarshalJSON()
if err != nil {
return karma.Format(
err,
"unable to marshal Unstructured to json",
)
}
err = json.Unmarshal(b, v)
if err != nil {
return karma.Format(
err,
"unable to unmarshal json into %T",
v,
)
}
return nil
}