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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 croncontroller
import (
"fmt"
"github.com/davecgh/go-spew/spew"
"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
handler UpdateHandler
}
// UpdateHandler knows how to handle updates for a JobConfig.
type UpdateHandler interface {
OnUpdate(*execution.JobConfig)
}
func NewInformerWorker(ctrlContext *Context, handler UpdateHandler) *InformerWorker {
w := &InformerWorker{
Context: ctrlContext,
handler: handler,
}
return w
}
func (w *InformerWorker) WorkerName() string {
return fmt.Sprintf("%v.Informer", controllerName)
}
func (w *InformerWorker) Init() {
// Add event handler when we get JobConfig updates.
w.jobconfigInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
UpdateFunc: func(oldObj, newObj interface{}) {
w.handleUpdate(oldObj, newObj)
},
DeleteFunc: w.enqueueFlush,
})
}
func (w *InformerWorker) handleUpdate(oldObj, newObj interface{}) {
oldRjc, err := eventhandler.Executionv1alpha1JobConfig(oldObj)
if err != nil {
klog.ErrorS(err, "croncontroller: unable to handle event", "worker", w.WorkerName())
return
}
newRjc, err := eventhandler.Executionv1alpha1JobConfig(newObj)
if err != nil {
klog.ErrorS(err, "croncontroller: unable to handle event", "worker", w.WorkerName())
return
}
// Flush next schedule time if its scheduling policy was updated.
isEqual, err := IsScheduleEqual(oldRjc.Spec.Schedule, newRjc.Spec.Schedule)
if err != nil {
klog.ErrorS(err, "croncontroller: cannot compare equal",
"oldRjc", oldRjc,
"newRjc", newRjc,
)
return
}
// Detected update.
if !isEqual {
w.enqueueFlush(newRjc)
}
}
func (w *InformerWorker) enqueueFlush(obj interface{}) {
rjc, err := eventhandler.Executionv1alpha1JobConfig(obj)
if err == nil {
klog.V(5).InfoS("croncontroller: flushing last schedule time of JobConfig",
"worker", w.WorkerName(),
"namespace", rjc.GetNamespace(),
"name", rjc.GetName(),
"schedule", spew.Sdump(rjc.Spec.Schedule),
)
w.handler.OnUpdate(rjc)
}
}
type updateHandler struct {
updateChan chan *execution.JobConfig
}
var _ UpdateHandler = (*updateHandler)(nil)
func NewUpdateHandler(ctrlContext *Context) UpdateHandler {
return &updateHandler{updateChan: ctrlContext.updatedConfigs}
}
func (d *updateHandler) OnUpdate(jobConfig *execution.JobConfig) {
d.updateChan <- jobConfig
}