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controller.go
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controller.go
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// Copyright 2018 Google Inc. All Rights Reserved.
//
// 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 fleetautoscalers
import (
"encoding/json"
"fmt"
"time"
"agones.dev/agones/pkg/apis/stable"
stablev1alpha1 "agones.dev/agones/pkg/apis/stable/v1alpha1"
"agones.dev/agones/pkg/client/clientset/versioned"
getterv1alpha1 "agones.dev/agones/pkg/client/clientset/versioned/typed/stable/v1alpha1"
"agones.dev/agones/pkg/client/informers/externalversions"
listerv1alpha1 "agones.dev/agones/pkg/client/listers/stable/v1alpha1"
"agones.dev/agones/pkg/util/crd"
"agones.dev/agones/pkg/util/runtime"
"agones.dev/agones/pkg/util/webhooks"
"agones.dev/agones/pkg/util/workerqueue"
"github.com/heptiolabs/healthcheck"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
admv1beta1 "k8s.io/api/admission/v1beta1"
corev1 "k8s.io/api/core/v1"
extclientset "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
"k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset/typed/apiextensions/v1beta1"
apiequality "k8s.io/apimachinery/pkg/api/equality"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
)
// Controller is a the FleetAutoscaler controller
type Controller struct {
logger *logrus.Entry
crdGetter v1beta1.CustomResourceDefinitionInterface
fleetGetter getterv1alpha1.FleetsGetter
fleetLister listerv1alpha1.FleetLister
fleetAutoscalerGetter getterv1alpha1.FleetAutoscalersGetter
fleetAutoscalerLister listerv1alpha1.FleetAutoscalerLister
fleetAutoscalerSynced cache.InformerSynced
workerqueue *workerqueue.WorkerQueue
recorder record.EventRecorder
}
// NewController returns a controller for a FleetAutoscaler
func NewController(
wh *webhooks.WebHook,
health healthcheck.Handler,
kubeClient kubernetes.Interface,
extClient extclientset.Interface,
agonesClient versioned.Interface,
agonesInformerFactory externalversions.SharedInformerFactory) *Controller {
agonesInformer := agonesInformerFactory.Stable().V1alpha1()
fasInformer := agonesInformer.FleetAutoscalers().Informer()
c := &Controller{
crdGetter: extClient.ApiextensionsV1beta1().CustomResourceDefinitions(),
fleetGetter: agonesClient.StableV1alpha1(),
fleetLister: agonesInformer.Fleets().Lister(),
fleetAutoscalerGetter: agonesClient.StableV1alpha1(),
fleetAutoscalerLister: agonesInformer.FleetAutoscalers().Lister(),
fleetAutoscalerSynced: fasInformer.HasSynced,
}
c.logger = runtime.NewLoggerWithType(c)
c.workerqueue = workerqueue.NewWorkerQueue(c.syncFleetAutoscaler, c.logger, stable.GroupName+".FleetAutoscalerController")
health.AddLivenessCheck("fleetautoscaler-workerqueue", healthcheck.Check(c.workerqueue.Healthy))
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(c.logger.Infof)
eventBroadcaster.StartRecordingToSink(&typedcorev1.EventSinkImpl{Interface: kubeClient.CoreV1().Events("")})
c.recorder = eventBroadcaster.NewRecorder(scheme.Scheme, corev1.EventSource{Component: "fleetautoscaler-controller"})
kind := stablev1alpha1.Kind("FleetAutoscaler")
wh.AddHandler("/validate", kind, admv1beta1.Create, c.validationHandler)
wh.AddHandler("/validate", kind, admv1beta1.Update, c.validationHandler)
fasInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.workerqueue.Enqueue,
UpdateFunc: func(_, newObj interface{}) {
c.workerqueue.Enqueue(newObj)
},
})
return c
}
// Run the FleetAutoscaler controller. Will block until stop is closed.
// Runs threadiness number workers to process the rate limited queue
func (c *Controller) Run(workers int, stop <-chan struct{}) error {
err := crd.WaitForEstablishedCRD(c.crdGetter, "fleetautoscalers."+stable.GroupName, c.logger)
if err != nil {
return err
}
c.logger.Info("Wait for cache sync")
if !cache.WaitForCacheSync(stop, c.fleetAutoscalerSynced) {
return errors.New("failed to wait for caches to sync")
}
c.workerqueue.Run(workers, stop)
return nil
}
// validationHandler will intercept when a FleetAutoscaler is created, and
// validate its settings.
func (c *Controller) validationHandler(review admv1beta1.AdmissionReview) (admv1beta1.AdmissionReview, error) {
c.logger.WithField("review", review).Info("validationHandler")
obj := review.Request.Object
fas := &stablev1alpha1.FleetAutoscaler{}
err := json.Unmarshal(obj.Raw, fas)
if err != nil {
return review, errors.Wrapf(err, "error unmarshalling original FleetAutoscaler json: %s", obj.Raw)
}
var causes []metav1.StatusCause
causes = fas.Validate(causes)
if len(causes) != 0 {
review.Response.Allowed = false
details := metav1.StatusDetails{
Name: review.Request.Name,
Group: review.Request.Kind.Group,
Kind: review.Request.Kind.Kind,
Causes: causes,
}
review.Response.Result = &metav1.Status{
Status: metav1.StatusFailure,
Message: "FleetAutoscaler is invalid",
Reason: metav1.StatusReasonInvalid,
Details: &details,
}
}
return review, nil
}
// syncFleetAutoscaler scales the attached fleet and
// synchronizes the FleetAutoscaler CRD
func (c *Controller) syncFleetAutoscaler(key string) error {
c.logger.WithField("key", key).Info("Synchronising")
// Convert the namespace/name string into a distinct namespace and name
namespace, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
// don't return an error, as we don't want this retried
runtime.HandleError(c.logger.WithField("key", key), errors.Wrapf(err, "invalid resource key"))
return nil
}
fas, err := c.fleetAutoscalerLister.FleetAutoscalers(namespace).Get(name)
if err != nil {
if k8serrors.IsNotFound(err) {
c.logger.WithField("key", key).Info(fmt.Sprintf("FleetAutoscaler %s from namespace %s is no longer available for syncing", name, namespace))
return nil
}
return errors.Wrapf(err, "error retrieving FleetAutoscaler %s from namespace %s", name, namespace)
}
// Retrieve the fleet by spec name
fleet, err := c.fleetLister.Fleets(namespace).Get(fas.Spec.FleetName)
if err != nil {
if k8serrors.IsNotFound(err) {
logrus.WithError(err).WithField("fleetAutoscaler", fas.Name).
WithField("fleet", fas.Spec.FleetName).
WithField("namespace", namespace).
Warn("Could not find fleet for autoscaler. Skipping.")
c.recorder.Eventf(fas, corev1.EventTypeWarning, "FailedGetFleet",
"could not fetch fleet: %s", fas.Spec.FleetName)
// don't retry. Pick it up next sync.
err = nil
}
if err := c.updateStatusUnableToScale(fas); err != nil {
return err
}
return err
}
currentReplicas := fleet.Status.Replicas
desiredReplicas, scalingLimited, err := computeDesiredFleetSize(fas, fleet)
if err != nil {
if err := c.updateStatusUnableToScale(fas); err != nil {
return err
}
return errors.Wrapf(err, "error calculating autoscaling fleet: %s", fleet.ObjectMeta.Name)
}
// Scale the fleet to the new size
if err = c.scaleFleet(fas, fleet, desiredReplicas); err != nil {
return errors.Wrapf(err, "error autoscaling fleet %s to %d replicas", fas.Spec.FleetName, desiredReplicas)
}
return c.updateStatus(fas, currentReplicas, desiredReplicas, desiredReplicas != fleet.Spec.Replicas, scalingLimited)
}
// scaleFleet scales the fleet of the autoscaler to a new number of replicas
func (c *Controller) scaleFleet(fas *stablev1alpha1.FleetAutoscaler, f *stablev1alpha1.Fleet, replicas int32) error {
if replicas != f.Spec.Replicas {
fCopy := f.DeepCopy()
fCopy.Spec.Replicas = replicas
fCopy, err := c.fleetGetter.Fleets(f.ObjectMeta.Namespace).Update(fCopy)
if err != nil {
return errors.Wrapf(err, "error updating replicas for fleet %s", f.ObjectMeta.Name)
}
c.recorder.Eventf(fas, corev1.EventTypeNormal, "AutoScalingFleet",
"Scaling fleet %s from %d to %d", fCopy.ObjectMeta.Name, f.Spec.Replicas, fCopy.Spec.Replicas)
}
return nil
}
// updateStatus updates the status of the given FleetAutoscaler
func (c *Controller) updateStatus(fas *stablev1alpha1.FleetAutoscaler, currentReplicas int32, desiredReplicas int32, scaled bool, scalingLimited bool) error {
fasCopy := fas.DeepCopy()
fasCopy.Status.AbleToScale = true
fasCopy.Status.ScalingLimited = scalingLimited
fasCopy.Status.CurrentReplicas = currentReplicas
fasCopy.Status.DesiredReplicas = desiredReplicas
if scaled {
now := metav1.NewTime(time.Now())
fasCopy.Status.LastScaleTime = &now
}
if !apiequality.Semantic.DeepEqual(fas.Status, fasCopy.Status) {
if scalingLimited {
c.recorder.Eventf(fas, corev1.EventTypeWarning, "ScalingLimited", "Scaling fleet %s was limited to maximum size of %d", fas.Spec.FleetName, desiredReplicas)
}
_, err := c.fleetAutoscalerGetter.FleetAutoscalers(fas.ObjectMeta.Namespace).Update(fasCopy)
if err != nil {
return errors.Wrapf(err, "error updating status for fleetautoscaler %s", fas.ObjectMeta.Name)
}
}
return nil
}
// updateStatus updates the status of the given FleetAutoscaler in the case we're not able to scale
func (c *Controller) updateStatusUnableToScale(fas *stablev1alpha1.FleetAutoscaler) error {
fasCopy := fas.DeepCopy()
fasCopy.Status.AbleToScale = false
fasCopy.Status.ScalingLimited = false
fasCopy.Status.CurrentReplicas = 0
fasCopy.Status.DesiredReplicas = 0
if !apiequality.Semantic.DeepEqual(fas.Status, fasCopy.Status) {
_, err := c.fleetAutoscalerGetter.FleetAutoscalers(fas.ObjectMeta.Namespace).Update(fasCopy)
if err != nil {
return errors.Wrapf(err, "error updating status for fleetautoscaler %s", fas.ObjectMeta.Name)
}
}
return nil
}