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controller.go
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controller.go
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/*
Copyright 2018 The Federation v2 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 schedulingpreference
import (
"fmt"
"time"
"github.com/golang/glog"
fedv1a1 "github.com/kubernetes-sigs/federation-v2/pkg/apis/core/v1alpha1"
fedclientset "github.com/kubernetes-sigs/federation-v2/pkg/client/clientset/versioned"
"github.com/kubernetes-sigs/federation-v2/pkg/controller/util"
"github.com/kubernetes-sigs/federation-v2/pkg/schedulingtypes"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
pkgruntime "k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apimachinery/pkg/watch"
kubeclientset "k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/flowcontrol"
"k8s.io/client-go/util/workqueue"
crclientset "k8s.io/cluster-registry/pkg/client/clientset/versioned"
)
const (
allClustersKey = "ALL_CLUSTERS"
)
// SchedulingPreferenceController syncronises the template, override
// and placement for a target template with its spec (user preference).
type SchedulingPreferenceController struct {
// Used to allow time delay in triggering reconciliation
// when any of RSP, target template, override or placement
// changes.
deliverer *util.DelayingDeliverer
// For triggering reconciliation of all resources (only in
// federation). This is used when a new cluster becomes available.
clusterDeliverer *util.DelayingDeliverer
// scheduler holds all the information and functionality
// to handle the target objects of given type
scheduler schedulingtypes.Scheduler
// Store for self
store cache.Store
// Informer for self
controller cache.Controller
// Work queue allowing parallel processing of resources
workQueue workqueue.Interface
// Backoff manager
backoff *flowcontrol.Backoff
// For events
eventRecorder record.EventRecorder
reviewDelay time.Duration
clusterAvailableDelay time.Duration
clusterUnavailableDelay time.Duration
smallDelay time.Duration
updateTimeout time.Duration
}
// SchedulingPreferenceController starts a new controller for given type of SchedulingPreferences
func StartSchedulingPreferenceController(kind string, schedulerFactory schedulingtypes.SchedulerFactory, config *restclient.Config, fedNamespace, clusterNamespace, targetNamespace string, stopChan <-chan struct{}, minimizeLatency bool) error {
restclient.AddUserAgent(config, fmt.Sprintf("%s-controller", kind))
fedClient := fedclientset.NewForConfigOrDie(config)
kubeClient := kubeclientset.NewForConfigOrDie(config)
crClient := crclientset.NewForConfigOrDie(config)
controller, err := newSchedulingPreferenceController(kind, schedulerFactory, fedClient, kubeClient, crClient, fedNamespace, clusterNamespace, targetNamespace)
if err != nil {
return err
}
if minimizeLatency {
controller.minimizeLatency()
}
glog.Infof(fmt.Sprintf("Starting replicaschedulingpreferences controller"))
controller.Run(stopChan)
return nil
}
// newSchedulingPreferenceController returns a new SchedulingPreference Controller for the given type
func newSchedulingPreferenceController(kind string, schedulerFactory schedulingtypes.SchedulerFactory, fedClient fedclientset.Interface, kubeClient kubeclientset.Interface, crClient crclientset.Interface, fedNamespace, clusterNamespace, targetNamespace string) (*SchedulingPreferenceController, error) {
broadcaster := record.NewBroadcaster()
broadcaster.StartRecordingToSink(&typedcorev1.EventSinkImpl{Interface: kubeClient.CoreV1().Events("")})
recorder := broadcaster.NewRecorder(scheme.Scheme, corev1.EventSource{Component: fmt.Sprintf("replicaschedulingpreference-controller")})
s := &SchedulingPreferenceController{
reviewDelay: time.Second * 10,
clusterAvailableDelay: time.Second * 20,
clusterUnavailableDelay: time.Second * 60,
smallDelay: time.Second * 3,
updateTimeout: time.Second * 30,
workQueue: workqueue.New(),
backoff: flowcontrol.NewBackOff(5*time.Second, time.Minute),
eventRecorder: recorder,
}
s.scheduler = schedulerFactory(fedClient,
kubeClient,
crClient,
fedNamespace,
clusterNamespace,
targetNamespace,
func(obj pkgruntime.Object) {
s.deliverObj(obj, 0, false)
},
func(obj pkgruntime.Object) {
s.deliverObj(obj, s.reviewDelay, false)
},
&util.ClusterLifecycleHandlerFuncs{
ClusterAvailable: func(cluster *fedv1a1.FederatedCluster) {
// When new cluster becomes available process all the target resources again.
s.clusterDeliverer.DeliverAt(allClustersKey, nil, time.Now().Add(s.clusterAvailableDelay))
},
// When a cluster becomes unavailable process all the target resources again.
ClusterUnavailable: func(cluster *fedv1a1.FederatedCluster, _ []interface{}) {
s.clusterDeliverer.DeliverAt(allClustersKey, nil, time.Now().Add(s.clusterUnavailableDelay))
},
})
// Build delivereres for triggering reconciliations.
s.deliverer = util.NewDelayingDeliverer()
s.clusterDeliverer = util.NewDelayingDeliverer()
s.store, s.controller = cache.NewInformer(
&cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (pkgruntime.Object, error) {
return s.scheduler.FedList(targetNamespace, options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
return s.scheduler.FedWatch(targetNamespace, options)
},
},
s.scheduler.ObjectType(),
util.NoResyncPeriod,
util.NewTriggerOnAllChanges(
func(obj pkgruntime.Object) {
s.deliverObj(obj, 0, false)
}),
)
return s, nil
}
// minimizeLatency reduces delays and timeouts to make the controller more responsive (useful for testing).
func (s *SchedulingPreferenceController) minimizeLatency() {
s.clusterAvailableDelay = time.Second
s.clusterUnavailableDelay = time.Second
s.reviewDelay = 50 * time.Millisecond
s.smallDelay = 20 * time.Millisecond
s.updateTimeout = 5 * time.Second
}
func (s *SchedulingPreferenceController) Run(stopChan <-chan struct{}) {
go s.controller.Run(stopChan)
s.scheduler.Start(stopChan)
s.deliverer.StartWithHandler(func(item *util.DelayingDelivererItem) {
s.workQueue.Add(item)
})
s.clusterDeliverer.StartWithHandler(func(_ *util.DelayingDelivererItem) {
s.reconcileOnClusterChange()
})
go wait.Until(s.worker, time.Second, stopChan)
util.StartBackoffGC(s.backoff, stopChan)
// Ensure all goroutines are cleaned up when the stop channel closes
go func() {
<-stopChan
s.workQueue.ShutDown()
s.deliverer.Stop()
s.clusterDeliverer.Stop()
s.scheduler.Stop()
}()
}
func (s *SchedulingPreferenceController) worker() {
for {
item, quit := s.workQueue.Get()
if quit {
return
}
typedItem := item.(*util.DelayingDelivererItem)
qualifiedName := typedItem.Value.(*util.QualifiedName)
status := s.reconcile(*qualifiedName)
s.workQueue.Done(typedItem)
switch status {
case util.StatusAllOK:
break
case util.StatusError:
s.deliver(*qualifiedName, 0, true)
case util.StatusNeedsRecheck:
s.deliver(*qualifiedName, s.reviewDelay, false)
case util.StatusNotSynced:
s.deliver(*qualifiedName, s.clusterAvailableDelay, false)
}
}
}
func (s *SchedulingPreferenceController) deliverObj(obj pkgruntime.Object, delay time.Duration, failed bool) {
qualifiedName := util.NewQualifiedName(obj)
s.deliver(qualifiedName, delay, failed)
}
// Adds backoff to delay if this delivery is related to some failure. Resets backoff if there was no failure.
func (s *SchedulingPreferenceController) deliver(qualifiedName util.QualifiedName, delay time.Duration, failed bool) {
key := qualifiedName.String()
if failed {
s.backoff.Next(key, time.Now())
delay = delay + s.backoff.Get(key)
} else {
s.backoff.Reset(key)
}
s.deliverer.DeliverAfter(key, &qualifiedName, delay)
}
// Check whether all data stores are in sync. False is returned if any of the informer/stores is not yet
// synced with the corresponding api server.
func (s *SchedulingPreferenceController) isSynced() bool {
return s.controller.HasSynced() && s.scheduler.HasSynced()
}
// The function triggers reconciliation of all known RSP resources.
func (s *SchedulingPreferenceController) reconcileOnClusterChange() {
if !s.isSynced() {
s.clusterDeliverer.DeliverAt(allClustersKey, nil, time.Now().Add(s.clusterAvailableDelay))
}
for _, obj := range s.store.List() {
qualifiedName := util.NewQualifiedName(obj.(pkgruntime.Object))
s.deliver(qualifiedName, s.smallDelay, false)
}
}
func (s *SchedulingPreferenceController) reconcile(qualifiedName util.QualifiedName) util.ReconciliationStatus {
if !s.isSynced() {
return util.StatusNotSynced
}
kind := s.scheduler.Kind()
key := qualifiedName.String()
glog.V(4).Infof("Starting to reconcile %s controller triggerred key named %v", kind, key)
startTime := time.Now()
defer glog.V(4).Infof("Finished reconciling %s controller triggerred key named %v (duration: %v)", kind, key, time.Now().Sub(startTime))
obj, err := s.objFromCache(s.store, kind, key)
if err != nil {
return util.StatusAllOK
}
if obj == nil {
// Nothing to do
return util.StatusAllOK
}
return s.scheduler.Reconcile(obj, qualifiedName)
}
func (s *SchedulingPreferenceController) objFromCache(store cache.Store, kind, key string) (pkgruntime.Object, error) {
cachedObj, exist, err := store.GetByKey(key)
if err != nil {
wrappedErr := fmt.Errorf("Failed to query store while reconciling RSP controller, triggerred by %s named %q: %v", kind, key, err)
runtime.HandleError(wrappedErr)
return nil, err
}
if !exist {
return nil, nil
}
return cachedObj.(pkgruntime.Object).DeepCopyObject(), nil
}