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controller.go
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controller.go
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// Copyright 2018 Google LLC 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 (
"context"
"encoding/json"
"fmt"
"sync"
"time"
agonesv1 "agones.dev/agones/pkg/apis/agones/v1"
"agones.dev/agones/pkg/apis/autoscaling"
autoscalingv1 "agones.dev/agones/pkg/apis/autoscaling/v1"
"agones.dev/agones/pkg/client/clientset/versioned"
typedagonesv1 "agones.dev/agones/pkg/client/clientset/versioned/typed/agones/v1"
typedautoscalingv1 "agones.dev/agones/pkg/client/clientset/versioned/typed/autoscaling/v1"
"agones.dev/agones/pkg/client/informers/externalversions"
listeragonesv1 "agones.dev/agones/pkg/client/listers/agones/v1"
listerautoscalingv1 "agones.dev/agones/pkg/client/listers/autoscaling/v1"
"agones.dev/agones/pkg/gameservers"
"agones.dev/agones/pkg/util/crd"
"agones.dev/agones/pkg/util/logfields"
"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"
"gomodules.xyz/jsonpatch/v2"
admissionv1 "k8s.io/api/admission/v1"
corev1 "k8s.io/api/core/v1"
extclientset "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
apiextclientv1 "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset/typed/apiextensions/v1"
apiequality "k8s.io/apimachinery/pkg/api/equality"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
runtimeschema "k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/wait"
"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"
"k8s.io/utils/clock"
)
// fasThread is used for tracking each Fleet's autoscaling jobs
//
//nolint:govet // ignore fieldalignment, one per fleet autoscaler
type fasThread struct {
generation int64
cancel context.CancelFunc
}
// Extensions struct contains what is needed to bind webhook handlers
type Extensions struct {
baseLogger *logrus.Entry
}
// Controller is the FleetAutoscaler controller
//
//nolint:govet // ignore fieldalignment, singleton
type Controller struct {
baseLogger *logrus.Entry
clock clock.WithTickerAndDelayedExecution
counter *gameservers.PerNodeCounter
crdGetter apiextclientv1.CustomResourceDefinitionInterface
fasThreads map[types.UID]fasThread
fasThreadMutex sync.Mutex
fleetGetter typedagonesv1.FleetsGetter
fleetLister listeragonesv1.FleetLister
fleetSynced cache.InformerSynced
fleetAutoscalerGetter typedautoscalingv1.FleetAutoscalersGetter
fleetAutoscalerLister listerautoscalingv1.FleetAutoscalerLister
fleetAutoscalerSynced cache.InformerSynced
workerqueue *workerqueue.WorkerQueue
recorder record.EventRecorder
gameServerLister listeragonesv1.GameServerLister
}
// NewController returns a controller for a FleetAutoscaler
func NewController(
health healthcheck.Handler,
kubeClient kubernetes.Interface,
extClient extclientset.Interface,
agonesClient versioned.Interface,
agonesInformerFactory externalversions.SharedInformerFactory,
counter *gameservers.PerNodeCounter) *Controller {
autoscaler := agonesInformerFactory.Autoscaling().V1().FleetAutoscalers()
fleetInformer := agonesInformerFactory.Agones().V1().Fleets()
gameServers := agonesInformerFactory.Agones().V1().GameServers()
c := &Controller{
clock: clock.RealClock{},
counter: counter,
crdGetter: extClient.ApiextensionsV1().CustomResourceDefinitions(),
fasThreads: map[types.UID]fasThread{},
fasThreadMutex: sync.Mutex{},
fleetGetter: agonesClient.AgonesV1(),
fleetLister: fleetInformer.Lister(),
fleetSynced: fleetInformer.Informer().HasSynced,
fleetAutoscalerGetter: agonesClient.AutoscalingV1(),
fleetAutoscalerLister: autoscaler.Lister(),
fleetAutoscalerSynced: autoscaler.Informer().HasSynced,
gameServerLister: gameServers.Lister(),
}
c.baseLogger = runtime.NewLoggerWithType(c)
c.workerqueue = workerqueue.NewWorkerQueueWithRateLimiter(c.syncFleetAutoscaler, c.baseLogger, logfields.FleetAutoscalerKey, autoscaling.GroupName+".FleetAutoscalerController", workerqueue.FastRateLimiter(3*time.Second))
health.AddLivenessCheck("fleetautoscaler-workerqueue", healthcheck.Check(c.workerqueue.Healthy))
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(c.baseLogger.Debugf)
eventBroadcaster.StartRecordingToSink(&typedcorev1.EventSinkImpl{Interface: kubeClient.CoreV1().Events("")})
c.recorder = eventBroadcaster.NewRecorder(scheme.Scheme, corev1.EventSource{Component: "fleetautoscaler-controller"})
_, _ = autoscaler.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
c.addFasThread(obj.(*autoscalingv1.FleetAutoscaler), true)
},
UpdateFunc: func(_, newObj interface{}) {
c.updateFasThread(newObj.(*autoscalingv1.FleetAutoscaler))
},
DeleteFunc: func(obj interface{}) {
// Could be a DeletedFinalStateUnknown, in which case, just ignore it
fas, ok := obj.(*autoscalingv1.FleetAutoscaler)
if !ok {
return
}
c.deleteFasThread(fas, true)
},
})
return c
}
// NewExtensions binds the handlers to the webhook outside the initialization of the controller
// initializes a new logger for extensions.
func NewExtensions(wh *webhooks.WebHook) *Extensions {
ext := &Extensions{}
ext.baseLogger = runtime.NewLoggerWithType(ext)
kind := autoscalingv1.Kind("FleetAutoscaler")
wh.AddHandler("/mutate", kind, admissionv1.Create, ext.mutationHandler)
wh.AddHandler("/mutate", kind, admissionv1.Update, ext.mutationHandler)
wh.AddHandler("/validate", kind, admissionv1.Create, ext.validationHandler)
wh.AddHandler("/validate", kind, admissionv1.Update, ext.validationHandler)
return ext
}
// Run the FleetAutoscaler controller. Will block until stop is closed.
// Runs threadiness number workers to process the rate limited queue
func (c *Controller) Run(ctx context.Context, workers int) error {
err := crd.WaitForEstablishedCRD(ctx, c.crdGetter, "fleetautoscalers."+autoscaling.GroupName, c.baseLogger)
if err != nil {
return err
}
c.baseLogger.Debug("Wait for cache sync")
if !cache.WaitForCacheSync(ctx.Done(), c.fleetSynced, c.fleetAutoscalerSynced) {
return errors.New("failed to wait for caches to sync")
}
go func() {
// clean all go routines when ctx is Done
<-ctx.Done()
c.fasThreadMutex.Lock()
defer c.fasThreadMutex.Unlock()
for _, thread := range c.fasThreads {
thread.cancel()
}
}()
c.workerqueue.Run(ctx, workers)
return nil
}
func loggerForFleetAutoscalerKey(key string, logger *logrus.Entry) *logrus.Entry {
return logfields.AugmentLogEntry(logger, logfields.FleetAutoscalerKey, key)
}
func loggerForFleetAutoscaler(fas *autoscalingv1.FleetAutoscaler, logger *logrus.Entry) *logrus.Entry {
fasName := "NilFleetAutoScaler"
if fas != nil {
fasName = fas.Namespace + "/" + fas.Name
}
return loggerForFleetAutoscalerKey(fasName, logger).WithField("fas", fas)
}
func (c *Controller) loggerForFleetAutoscalerKey(key string) *logrus.Entry {
return loggerForFleetAutoscalerKey(key, c.baseLogger)
}
func (c *Controller) loggerForFleetAutoscaler(fas *autoscalingv1.FleetAutoscaler) *logrus.Entry {
return loggerForFleetAutoscaler(fas, c.baseLogger)
}
// creationMutationHandler is the handler for the mutating webhook that sets the
// the default values on the FleetAutoscaler
func (ext *Extensions) mutationHandler(review admissionv1.AdmissionReview) (admissionv1.AdmissionReview, error) {
obj := review.Request.Object
fas := &autoscalingv1.FleetAutoscaler{}
err := json.Unmarshal(obj.Raw, fas)
if err != nil {
// If the JSON is invalid during mutation, fall through to validation. This allows OpenAPI schema validation
// to proceed, resulting in a more user friendly error message.
return review, nil
}
fas.ApplyDefaults()
newFas, err := json.Marshal(fas)
if err != nil {
return review, errors.Wrapf(err, "error marshalling default applied FleetAutoscaler %s to json", fas.ObjectMeta.Name)
}
patch, err := jsonpatch.CreatePatch(obj.Raw, newFas)
if err != nil {
return review, errors.Wrapf(err, "error creating patch for FleetAutoscaler %s", fas.ObjectMeta.Name)
}
jsonPatch, err := json.Marshal(patch)
if err != nil {
return review, errors.Wrapf(err, "error creating json for patch for FleetAutoScaler %s", fas.ObjectMeta.Name)
}
pt := admissionv1.PatchTypeJSONPatch
review.Response.PatchType = &pt
review.Response.Patch = jsonPatch
return review, nil
}
// validationHandler will intercept when a FleetAutoscaler is created, and
// validate its settings.
func (ext *Extensions) validationHandler(review admissionv1.AdmissionReview) (admissionv1.AdmissionReview, error) {
obj := review.Request.Object
fas := &autoscalingv1.FleetAutoscaler{}
err := json.Unmarshal(obj.Raw, fas)
if err != nil {
ext.baseLogger.WithField("review", review).WithError(err).Error("validationHandler")
return review, errors.Wrapf(err, "error unmarshalling FleetAutoscaler json after schema validation: %s", obj.Raw)
}
fas.ApplyDefaults()
if errs := fas.Validate(); len(errs) > 0 {
kind := runtimeschema.GroupKind{
Group: review.Request.Kind.Group,
Kind: review.Request.Kind.Kind,
}
statusErr := k8serrors.NewInvalid(kind, review.Request.Name, errs)
review.Response.Allowed = false
review.Response.Result = &statusErr.ErrStatus
loggerForFleetAutoscaler(fas, ext.baseLogger).WithField("review", review).Debug("Invalid FleetAutoscaler")
}
return review, nil
}
// syncFleetAutoscaler syncs FleetAutoScale according to different sync type
func (c *Controller) syncFleetAutoscaler(ctx context.Context, key string) error {
c.loggerForFleetAutoscalerKey(key).Debug("Synchronising")
fas, err := c.getFleetAutoscalerByKey(key)
if err != nil {
return err
}
if fas == nil {
return c.cleanFasThreads(key)
}
// Retrieve the fleet by spec name
fleet, err := c.fleetLister.Fleets(fas.Namespace).Get(fas.Spec.FleetName)
if err != nil {
if k8serrors.IsNotFound(err) {
c.loggerForFleetAutoscaler(fas).Debug("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(ctx, fas); err != nil {
return err
}
return err
}
// Don't do anything, the fleet is marked for deletion
if !fleet.DeletionTimestamp.IsZero() {
return nil
}
currentReplicas := fleet.Status.Replicas
desiredReplicas, scalingLimited, err := computeDesiredFleetSize(fas.Spec.Policy, fleet, c.gameServerLister, c.counter.Counts())
// If there err is nil and not an inactive schedule error (ignorable in this case), then record the event
if err != nil && !errors.Is(err, InactiveScheduleError{}) {
c.recorder.Eventf(fas, corev1.EventTypeWarning, "FleetAutoscaler",
"Error calculating desired fleet size on FleetAutoscaler %s. Error: %s", fas.ObjectMeta.Name, err.Error())
if err := c.updateStatusUnableToScale(ctx, 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(ctx, fas, fleet, desiredReplicas); err != nil {
return errors.Wrapf(err, "error autoscaling fleet %s to %d replicas", fas.Spec.FleetName, desiredReplicas)
}
return c.updateStatus(ctx, fas, currentReplicas, desiredReplicas, desiredReplicas != fleet.Spec.Replicas, scalingLimited)
}
// getFleetAutoscalerByKey gets the Fleet Autoscaler by key
// a nil FleetAutoscaler returned indicates that an attempt to sync should not be retried, e.g. if the FleetAutoscaler no longer exists.
func (c *Controller) getFleetAutoscalerByKey(key string) (*autoscalingv1.FleetAutoscaler, error) {
// 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.loggerForFleetAutoscalerKey(key), errors.Wrapf(err, "invalid resource key"))
return nil, nil
}
fas, err := c.fleetAutoscalerLister.FleetAutoscalers(namespace).Get(name)
if err != nil {
if k8serrors.IsNotFound(err) {
c.loggerForFleetAutoscalerKey(key).Debug(fmt.Sprintf("FleetAutoscaler %s from namespace %s is no longer available for syncing", name, namespace))
return nil, nil
}
return nil, errors.Wrapf(err, "error retrieving FleetAutoscaler %s from namespace %s", name, namespace)
}
return fas, nil
}
// scaleFleet scales the fleet of the autoscaler to a new number of replicas
func (c *Controller) scaleFleet(ctx context.Context, fas *autoscalingv1.FleetAutoscaler, f *agonesv1.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(ctx, fCopy, metav1.UpdateOptions{})
if err != nil {
c.recorder.Eventf(fas, corev1.EventTypeWarning, "AutoScalingFleetError",
"Error on scaling fleet %s from %d to %d. Error: %s", fCopy.ObjectMeta.Name, f.Spec.Replicas, fCopy.Spec.Replicas, err.Error())
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(ctx context.Context, fas *autoscalingv1.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 {
// scalingLimited indicates that the calculated scale would be above or below the range defined by MinReplicas and MaxReplicas
msg := "Scaling fleet %s was limited to minimum size of %d"
if currentReplicas > desiredReplicas {
msg = "Scaling fleet %s was limited to maximum size of %d"
}
c.recorder.Eventf(fas, corev1.EventTypeWarning, "ScalingLimited", msg, fas.Spec.FleetName, desiredReplicas)
}
_, err := c.fleetAutoscalerGetter.FleetAutoscalers(fas.ObjectMeta.Namespace).UpdateStatus(ctx, fasCopy, metav1.UpdateOptions{})
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(ctx context.Context, fas *autoscalingv1.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).UpdateStatus(ctx, fasCopy, metav1.UpdateOptions{})
if err != nil {
return errors.Wrapf(err, "error updating status for fleetautoscaler %s", fas.ObjectMeta.Name)
}
}
return nil
}
// addFasThread creates a ticker that enqueues the FleetAutoscaler for it's configured interval.
// If `lock` is set to true, the function will do appropriate locking for this operation. If set to `false`
// make sure to lock the operation with the c.fasThreadMutex for the execution of this command.
func (c *Controller) addFasThread(fas *autoscalingv1.FleetAutoscaler, lock bool) {
log := c.loggerForFleetAutoscaler(fas)
log.WithField("seconds", fas.Spec.Sync.FixedInterval.Seconds).Debug("Thread for Autoscaler created")
duration := time.Duration(fas.Spec.Sync.FixedInterval.Seconds) * time.Second
// store against the UID, as there is no guarantee the name is unique over time.
ctx, cancel := context.WithCancel(context.Background())
thread := fasThread{
cancel: cancel,
generation: fas.Generation,
}
if lock {
c.fasThreadMutex.Lock()
defer c.fasThreadMutex.Unlock()
}
// Seems unlikely that concurrent events could fire at the same time for the same UID,
// but just in case, let's check.
if _, ok := c.fasThreads[fas.ObjectMeta.UID]; ok {
return
}
c.fasThreads[fas.ObjectMeta.UID] = thread
// do immediate enqueue on addition to have an autoscale fire on addition.
c.workerqueue.Enqueue(fas)
// Add to queue for each duration period, until cancellation occurs.
// Workerqueue will handle if multiple attempts are made to add an existing item to the queue, and retries on failure
// etc.
go func() {
wait.Until(func() {
c.workerqueue.Enqueue(fas)
}, duration, ctx.Done())
}()
}
// updateFasThread will replace the queueing thread if the generation has changes on the FleetAutoscaler.
func (c *Controller) updateFasThread(fas *autoscalingv1.FleetAutoscaler) {
c.fasThreadMutex.Lock()
defer c.fasThreadMutex.Unlock()
thread, ok := c.fasThreads[fas.ObjectMeta.UID]
if !ok {
// maybe the controller crashed and we are only getting update events at this point, so let's add
// the thread back in
c.addFasThread(fas, false)
return
}
if fas.Generation != thread.generation {
c.loggerForFleetAutoscaler(fas).WithField("generation", thread.generation).
Debug("Fleet autoscaler generation updated, recreating thread")
c.deleteFasThread(fas, false)
c.addFasThread(fas, false)
}
}
// deleteFasThread removes a FleetAutoScaler sync routine.
// If `lock` is set to true, the function will do appropriate locking for this operation. If set to `false`
// make sure to lock the operation with the c.fasThreadMutex for the execution of this command.
func (c *Controller) deleteFasThread(fas *autoscalingv1.FleetAutoscaler, lock bool) {
c.loggerForFleetAutoscaler(fas).Debug("Thread for Autoscaler removed")
if lock {
c.fasThreadMutex.Lock()
defer c.fasThreadMutex.Unlock()
}
if thread, ok := c.fasThreads[fas.ObjectMeta.UID]; ok {
thread.cancel()
delete(c.fasThreads, fas.ObjectMeta.UID)
}
}
// cleanFasThreads will delete any fasThread that no longer
// can be tied to a FleetAutoscaler instance.
func (c *Controller) cleanFasThreads(key string) error {
c.baseLogger.WithField("key", key).Debug("Doing full autoscaler thread cleanup")
namespace, _, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
return errors.Wrap(err, "attempting to clean all fleet autoscaler threads")
}
fasList, err := c.fleetAutoscalerLister.FleetAutoscalers(namespace).List(labels.Everything())
if err != nil {
return errors.Wrap(err, "attempting to clean all fleet autoscaler threads")
}
c.fasThreadMutex.Lock()
defer c.fasThreadMutex.Unlock()
keys := map[types.UID]bool{}
for k := range c.fasThreads {
keys[k] = true
}
for _, fas := range fasList {
delete(keys, fas.ObjectMeta.UID)
}
// any key that doesn't match to an existing UID, stop it.
for k := range keys {
c.fasThreads[k].cancel()
delete(c.fasThreads, k)
}
return nil
}