/
informer.go
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/
informer.go
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/*
* Copyright 2022 The Furiko 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 jobcontroller
import (
"fmt"
kerrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/client-go/tools/cache"
"k8s.io/klog/v2"
execution "github.com/furiko-io/furiko/apis/execution/v1alpha1"
"github.com/furiko-io/furiko/pkg/utils/eventhandler"
)
// InformerWorker receives events from the informer and enqueues work to be done
// for the controller.
type InformerWorker struct {
*Context
}
func NewInformerWorker(ctrlContext *Context) *InformerWorker {
w := &InformerWorker{
Context: ctrlContext,
}
// Add event handler for Pods.
w.podInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: w.handlePod,
UpdateFunc: func(_, newObj interface{}) {
w.handlePod(newObj)
},
DeleteFunc: w.handlePod,
})
w.jobInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: w.enqueueObject,
UpdateFunc: func(_, newObj interface{}) {
w.enqueueObject(newObj)
},
DeleteFunc: w.enqueueObject,
})
return w
}
func (w *InformerWorker) WorkerName() string {
return fmt.Sprintf("%v.Informer", controllerName)
}
// enqueueObject enqueues an object to the workqueue.
// This method also accepts DeletionFinalStateUnknown tombstone objects also since it uses a wrapped KeyFunc.
func (w *InformerWorker) enqueueObject(obj interface{}) {
// Get key to enqueue.
key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
if err != nil {
klog.ErrorS(err, "jobcontroller: keyfunc error", "worker", w.WorkerName(), "obj", obj)
return
}
// Add to workqueue.
w.queue.Add(key)
}
func (w *InformerWorker) handlePod(obj interface{}) {
pod, err := eventhandler.Corev1Pod(obj)
if err != nil {
klog.ErrorS(err, "jobcontroller: unable to handle event", "worker", w.WorkerName())
return
}
if controllerRef := metav1.GetControllerOf(pod); controllerRef != nil {
rj := w.resolveRefedJob(pod.GetNamespace(), controllerRef)
if rj != nil {
w.enqueueObject(rj)
return
}
}
}
// resolveRefedJob returns the Job referenced by ControllerRef.
// It does sanity checks to ensure that we don't return inaccurate objects.
func (w *InformerWorker) resolveRefedJob(namespace string, ref *metav1.OwnerReference) *execution.Job {
// Wrong kind.
if ref.Kind != execution.KindJob {
return nil
}
// Look up Job by name.
rj, err := w.jobInformer.Lister().Jobs(namespace).Get(ref.Name)
if err != nil {
if !kerrors.IsNotFound(err) {
utilruntime.HandleError(err)
}
return nil
}
// Check if UID matches
if rj.UID != ref.UID {
return nil
}
return rj
}