/
clustersynchro_manager.go
698 lines (593 loc) · 23.5 KB
/
clustersynchro_manager.go
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package synchromanager
import (
"context"
"errors"
"fmt"
"math"
"math/rand"
"reflect"
"sync"
"time"
"k8s.io/apimachinery/pkg/api/equality"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/retry"
"k8s.io/client-go/util/workqueue"
"k8s.io/klog/v2"
metricsstore "k8s.io/kube-state-metrics/v2/pkg/metrics_store"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
clusterv1alpha2 "github.com/clusterpedia-io/api/cluster/v1alpha2"
"github.com/clusterpedia-io/clusterpedia/pkg/controller"
crdclientset "github.com/clusterpedia-io/clusterpedia/pkg/generated/clientset/versioned"
"github.com/clusterpedia-io/clusterpedia/pkg/generated/informers/externalversions"
clusterlister "github.com/clusterpedia-io/clusterpedia/pkg/generated/listers/cluster/v1alpha2"
kubestatemetrics "github.com/clusterpedia-io/clusterpedia/pkg/kube_state_metrics"
"github.com/clusterpedia-io/clusterpedia/pkg/storage"
"github.com/clusterpedia-io/clusterpedia/pkg/synchromanager/clustersynchro"
"github.com/clusterpedia-io/clusterpedia/pkg/synchromanager/features"
clusterpediafeature "github.com/clusterpedia-io/clusterpedia/pkg/utils/feature"
)
const ClusterSynchroControllerFinalizer = "clusterpedia.io/cluster-synchro-controller"
const defaultRetryNum = 5
type Manager struct {
runLock sync.Mutex
stopCh <-chan struct{}
clusterpediaclient crdclientset.Interface
informerFactory externalversions.SharedInformerFactory
shardingName string
queue workqueue.RateLimitingInterface
storage storage.StorageFactory
clusterlister clusterlister.PediaClusterLister
clusterSyncResourcesLister clusterlister.ClusterSyncResourcesLister
clusterInformer cache.SharedIndexInformer
clusterSyncConfig clustersynchro.ClusterSyncConfig
synchrolock sync.RWMutex
synchros map[string]*clustersynchro.ClusterSynchro
synchroWaitGroup wait.Group
}
var _ kubestatemetrics.ClusterMetricsWriterListGetter = &Manager{}
func NewManager(client crdclientset.Interface, storage storage.StorageFactory, syncConfig clustersynchro.ClusterSyncConfig, shardingName string) *Manager {
factory := externalversions.NewSharedInformerFactory(client, 0)
clusterinformer := factory.Cluster().V1alpha2().PediaClusters()
clusterSyncResourcesInformer := factory.Cluster().V1alpha2().ClusterSyncResources()
manager := &Manager{
informerFactory: factory,
clusterpediaclient: client,
shardingName: shardingName,
storage: storage,
clusterlister: clusterinformer.Lister(),
clusterInformer: clusterinformer.Informer(),
clusterSyncResourcesLister: clusterSyncResourcesInformer.Lister(),
queue: workqueue.NewRateLimitingQueue(
NewItemExponentialFailureAndJitterSlowRateLimter(2*time.Second, 15*time.Second, 1*time.Minute, 1.0, defaultRetryNum),
),
clusterSyncConfig: syncConfig,
synchros: make(map[string]*clustersynchro.ClusterSynchro),
}
if _, err := clusterinformer.Informer().AddEventHandler(
cache.ResourceEventHandlerFuncs{
AddFunc: manager.addCluster,
UpdateFunc: manager.updateCluster,
DeleteFunc: manager.deleteCluster,
},
); err != nil {
klog.ErrorS(err, "error when adding event handler to informer")
}
if _, err := clusterSyncResourcesInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: manager.handleClusterSyncResources,
UpdateFunc: func(oldObj, newObj interface{}) {
manager.handleClusterSyncResources(newObj)
},
DeleteFunc: manager.handleClusterSyncResources,
}); err != nil {
klog.ErrorS(err, "error when adding event handler to informer")
}
return manager
}
func (manager *Manager) GetMetricsWriterList() map[string]metricsstore.MetricsWriterList {
manager.synchrolock.RLock()
defer manager.synchrolock.RUnlock()
lists := make(map[string]metricsstore.MetricsWriterList, len(manager.synchros))
for name, synchro := range manager.synchros {
writers := synchro.GetMetricsWriterList()
if len(writers) != 0 {
lists[name] = writers
}
}
return lists
}
func (manager *Manager) Run(workers int, stopCh <-chan struct{}) {
manager.runLock.Lock()
defer manager.runLock.Unlock()
if manager.stopCh != nil {
klog.Fatal("clustersynchro manager is already running...")
}
klog.Info("Start Informer Factory")
// informerFactory should not be controlled by stopCh
stopInformer := make(chan struct{})
manager.informerFactory.Start(stopInformer)
if !cache.WaitForCacheSync(stopCh, manager.clusterInformer.HasSynced) {
klog.Fatal("clustersynchro manager: wait for informer factory failed")
}
manager.stopCh = stopCh
klog.InfoS("Start Manager Cluster Worker", "workers", workers)
var waitGroup sync.WaitGroup
for i := 0; i < workers; i++ {
waitGroup.Add(1)
go func() {
defer waitGroup.Done()
wait.Until(manager.worker, time.Second, manager.stopCh)
}()
}
<-manager.stopCh
klog.Info("receive stop signal, stop...")
manager.queue.ShutDown()
waitGroup.Wait()
klog.Info("wait for cluster synchros stop...")
manager.synchroWaitGroup.Wait()
klog.Info("cluster synchro manager stopped.")
}
func (manager *Manager) addCluster(obj interface{}) {
manager.enqueue(obj)
}
func (manager *Manager) updateCluster(older, newer interface{}) {
oldObj := older.(*clusterv1alpha2.PediaCluster)
newObj := newer.(*clusterv1alpha2.PediaCluster)
if newObj.DeletionTimestamp.IsZero() &&
equality.Semantic.DeepEqual(oldObj.Spec, newObj.Spec) &&
oldObj.Status.ShardingName == newObj.Status.ShardingName {
return
}
manager.enqueue(newer)
}
func (manager *Manager) deleteCluster(obj interface{}) {
manager.enqueue(obj)
}
func (manager *Manager) enqueue(obj interface{}) {
key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
if err != nil {
return
}
if cluster, ok := obj.(*clusterv1alpha2.PediaCluster); ok {
currentSharding := cluster.Status.ShardingName
if cluster.Spec.ShardingName != manager.shardingName {
if currentSharding == nil || *currentSharding != manager.shardingName {
return
}
} else if currentSharding != nil && *currentSharding != manager.shardingName {
return
}
}
manager.queue.Add(key)
}
func (manager *Manager) handleClusterSyncResources(obj interface{}) {
// ClusterSyncResources is cluster scoped resource, key is name
refName, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
if err != nil {
klog.ErrorS(err, "handle clustersyncresources failed")
return
}
clusters, err := manager.clusterlister.List(labels.Everything())
if err != nil {
klog.ErrorS(err, "list clusters failed while handling clustersyncresources", "clustersyncresources", refName)
return
}
for _, cluster := range clusters {
if cluster.Spec.SyncResourcesRefName == refName {
manager.enqueue(cluster)
}
}
}
func (manager *Manager) worker() {
for manager.processNextCluster() {
select {
case <-manager.stopCh:
return
default:
}
}
}
func (manager *Manager) processNextCluster() (continued bool) {
key, shutdown := manager.queue.Get()
if shutdown {
return false
}
defer manager.queue.Done(key)
continued = true
_, name, err := cache.SplitMetaNamespaceKey(key.(string))
if err != nil {
klog.Error(err)
return
}
klog.InfoS("reconcile cluster", "cluster", name)
cluster, err := manager.clusterlister.Get(name)
if err != nil {
if apierrors.IsNotFound(err) {
klog.InfoS("cluster has been deleted", "cluster", name)
return
}
klog.ErrorS(err, "Failed to get cluster from cache", "cluster", name)
return
}
cluster = cluster.DeepCopy()
if result := manager.reconcileCluster(cluster); result.Requeue() {
if num := manager.queue.NumRequeues(key); num < result.MaxRetryCount() {
klog.V(3).InfoS("requeue cluster", "cluster", name, "num requeues", num+1)
manager.queue.AddRateLimited(key)
return
}
klog.V(2).Infof("Dropping cluster %q out of the queue: %v", key, err)
}
manager.queue.Forget(key)
return
}
// if err returned is not nil, cluster will be requeued
func (manager *Manager) reconcileCluster(cluster *clusterv1alpha2.PediaCluster) controller.Result {
if cluster.Status.ShardingName == nil && cluster.Spec.ShardingName != manager.shardingName {
return controller.NoRequeueResult
}
if cluster.Status.ShardingName != nil && *cluster.Status.ShardingName != manager.shardingName {
return controller.NoRequeueResult
}
// After the above filtering, The cluster will be in the following state:
// 1. spec.sharding == manager.shardingName and status.sharding == nil
// 2. spec.sharding == manager.shardingName and status != nil and status.sharding == manager.shardingName
// 3. spec.sharding != manager.shardingName and status != nil and status.sharding == manager.shardingName
if !cluster.DeletionTimestamp.IsZero() {
klog.InfoS("remove cluster", "cluster", cluster.Name)
if err := manager.removeCluster(cluster.Name); err != nil {
klog.ErrorS(err, "Failed to remove cluster", cluster.Name)
return controller.RequeueResult(defaultRetryNum)
}
if !controllerutil.ContainsFinalizer(cluster, ClusterSynchroControllerFinalizer) {
return controller.NoRequeueResult
}
// remove finalizer
controllerutil.RemoveFinalizer(cluster, ClusterSynchroControllerFinalizer)
if _, err := manager.clusterpediaclient.ClusterV1alpha2().PediaClusters().Update(context.TODO(), cluster, metav1.UpdateOptions{}); err != nil {
klog.ErrorS(err, "Failed to remove finalizer", "cluster", cluster.Name)
return controller.RequeueResult(defaultRetryNum)
}
return controller.NoRequeueResult
}
// ensure finalizer
if !controllerutil.ContainsFinalizer(cluster, ClusterSynchroControllerFinalizer) {
controllerutil.AddFinalizer(cluster, ClusterSynchroControllerFinalizer)
if _, err := manager.clusterpediaclient.ClusterV1alpha2().PediaClusters().Update(context.TODO(), cluster, metav1.UpdateOptions{}); err != nil {
klog.ErrorS(err, "Failed to add finalizer", "cluster", cluster.Name)
return controller.RequeueResult(defaultRetryNum)
}
}
if cluster.Spec.ShardingName != manager.shardingName {
// status.sharding == manager.shardingName
manager.stopClusterSynchro(cluster.Name)
if err := manager.UpdateClusterShardingStatus(context.TODO(), cluster.Name, nil); err != nil {
klog.ErrorS(err, "Failed to remove cluster shardingName status", "cluster", cluster.Name)
return controller.RequeueResult(defaultRetryNum)
}
return controller.NoRequeueResult
}
cluster.Status.ShardingName = &manager.shardingName
manager.synchrolock.RLock()
synchro := manager.synchros[cluster.Name]
manager.synchrolock.RUnlock()
config, err := buildClusterConfig(cluster)
if err != nil {
klog.ErrorS(err, "Failed to build cluster config", "cluster", cluster.Name)
manager.UpdateClusterAPIServerAndValidatedCondition(cluster.Name, cluster.Spec.APIServer, synchro, clusterv1alpha2.InvalidConfigReason,
"invalid cluster config: "+err.Error(), metav1.ConditionFalse)
return controller.NoRequeueResult
}
var warnMsg string
syncResources := cluster.Spec.SyncResources
if refName := cluster.Spec.SyncResourcesRefName; refName != "" {
if ref, err := manager.clusterSyncResourcesLister.Get(refName); err != nil {
if !apierrors.IsNotFound(err) {
klog.ErrorS(err, "Failed to get SyncResourcesRef of cluster", "cluster", cluster.Name, "SyncResourcesRef", refName)
manager.UpdateClusterAPIServerAndValidatedCondition(cluster.Name, config.Host, synchro, clusterv1alpha2.InvalidSyncResourcesReason,
fmt.Sprintf("Failed to get cluster sync resources of cluster: %v", err), metav1.ConditionFalse)
return controller.RequeueResult(defaultRetryNum)
}
// TODO: Use more obvious method to let users know.
klog.Warningf("cluster(%s)'s SyncResourcesRef is not found", cluster.Name)
warnMsg = "Warning: sync resource ref is not found"
} else {
syncResources = append(syncResources, ref.Spec.SyncResources...)
}
}
// if `AllowSyncAllResources` is not enabled, then check whether the all-resource wildcard is used
if !clusterpediafeature.FeatureGate.Enabled(features.AllowSyncAllResources) {
for _, groupResources := range syncResources {
if groupResources.Group == "*" {
// When using the all-resource wildcard without feature gate enabled,
// it just updates the condition information and
// does not stop it if cluster synchro is already running.
//
// If have better suggestions can be discussed in the https://github.com/clusterpedia-io/clusterpedia/issues.
manager.UpdateClusterAPIServerAndValidatedCondition(cluster.Name, config.Host, synchro, clusterv1alpha2.InvalidSyncResourcesReason,
"ClusterSynchro Manager's feature gate `AllowSyncAllResources` is not enabled, cannot use all-resources wildcard", metav1.ConditionFalse)
return controller.NoRequeueResult
}
}
}
manager.UpdateClusterAPIServerAndValidatedCondition(cluster.Name, config.Host, synchro, clusterv1alpha2.ValidatedReason, warnMsg, metav1.ConditionTrue)
// check cluster config
if synchro != nil && !reflect.DeepEqual(synchro.RESTConfig, config) {
klog.InfoS("cluster config is changed, rebuild cluster synchro", "cluster", cluster.Name)
synchro.Shutdown(true)
synchro = nil
manager.synchrolock.Lock()
manager.synchros[cluster.Name] = synchro
manager.synchrolock.Unlock()
}
// create resource synchro
if synchro == nil {
synchro, err = clustersynchro.New(cluster.Name, config, manager.storage, manager, manager.clusterSyncConfig)
if err != nil {
_, forever := err.(clustersynchro.RetryableError)
klog.ErrorS(err, "Failed to create cluster synchro", "cluster", cluster.Name)
runningCondition := metav1.Condition{
Type: clusterv1alpha2.SynchroRunningCondition,
Reason: clusterv1alpha2.SynchroInitialFailedReason,
Status: metav1.ConditionFalse,
Message: err.Error(),
}
healthyCondition := metav1.Condition{
Type: clusterv1alpha2.ClusterHealthyCondition,
Reason: clusterv1alpha2.ClusterMonitorStopReason,
Status: metav1.ConditionUnknown,
Message: "wait cluster synchro",
}
clusterStatus := &clusterv1alpha2.ClusterStatus{Conditions: []metav1.Condition{runningCondition, healthyCondition}}
if err := manager.UpdateClusterStatus(context.TODO(), cluster.Name, clusterStatus); err != nil {
klog.ErrorS(err, "Failed to update cluster synchro running condition status", "cluster", cluster.Name)
if forever {
// if initial failed error is retryable, retry forever
return controller.RequeueResult(math.MaxInt)
}
return controller.RequeueResult(defaultRetryNum)
}
if forever {
return controller.RequeueResult(math.MaxInt)
}
return controller.NoRequeueResult
}
err = manager.storage.PrepareCluster(cluster.Name)
if err != nil {
klog.ErrorS(err, "Failed to prepare cluster", "cluster", cluster.Name)
return controller.NoRequeueResult
}
if err := manager.UpdateClusterShardingStatus(context.TODO(), cluster.Name, &manager.shardingName); err != nil {
klog.ErrorS(err, "Failed to update cluster shardingName status", "cluster", cluster.Name)
return controller.RequeueResult(defaultRetryNum)
}
manager.synchroWaitGroup.StartWithChannel(manager.stopCh, synchro.Run)
manager.synchrolock.Lock()
manager.synchros[cluster.Name] = synchro
manager.synchrolock.Unlock()
}
synchro.SetResources(syncResources, cluster.Spec.SyncAllCustomResources)
return controller.NoRequeueResult
}
func (manager *Manager) stopClusterSynchro(name string) {
manager.synchrolock.Lock()
synchro := manager.synchros[name]
delete(manager.synchros, name)
manager.synchrolock.Unlock()
if synchro != nil {
synchro.Shutdown(true)
}
}
func (manager *Manager) removeCluster(name string) error {
manager.synchrolock.Lock()
synchro := manager.synchros[name]
delete(manager.synchros, name)
manager.synchrolock.Unlock()
if synchro != nil {
// not update removed cluster status,
// and ensure that no more data is being synchronized to the resource storage
synchro.Shutdown(false)
}
// clean cluster from storage
return manager.storage.CleanCluster(context.TODO(), name)
}
func (manager *Manager) UpdateClusterAPIServerAndValidatedCondition(name string, apiServerEndpoint string, synchro *clustersynchro.ClusterSynchro, reason, message string, status metav1.ConditionStatus) {
validatedCondition := metav1.Condition{
Type: clusterv1alpha2.ValidatedCondition,
Reason: reason,
Status: status,
Message: message,
}
if err := manager.updateClusterStatus(context.TODO(), name, func(clusterStatus *clusterv1alpha2.ClusterStatus) {
// set cluster apiserver endpoint to cluster status
if apiServerEndpoint != "" {
clusterStatus.APIServer = apiServerEndpoint
}
meta.SetStatusCondition(&clusterStatus.Conditions, validatedCondition)
if synchro != nil {
return
}
// if the cluster synchro is nil, update SynchroRunning and ClusterHealthy conditions.
runningCondition := meta.FindStatusCondition(clusterStatus.Conditions, clusterv1alpha2.SynchroRunningCondition)
if validatedCondition.Status != metav1.ConditionTrue {
condition := metav1.Condition{
Type: clusterv1alpha2.SynchroRunningCondition,
Reason: validatedCondition.Reason,
Status: metav1.ConditionFalse,
Message: validatedCondition.Message,
}
meta.SetStatusCondition(&clusterStatus.Conditions, condition)
} else if runningCondition == nil || runningCondition.Reason != clusterv1alpha2.SynchroInitialFailedReason {
condition := metav1.Condition{
Type: clusterv1alpha2.SynchroRunningCondition,
Reason: clusterv1alpha2.SynchroWaitInitReason,
Status: metav1.ConditionFalse,
Message: "pediacluster is validated",
}
meta.SetStatusCondition(&clusterStatus.Conditions, condition)
}
healthyCondition := metav1.Condition{
Type: clusterv1alpha2.ClusterHealthyCondition,
Reason: clusterv1alpha2.ClusterMonitorStopReason,
Status: metav1.ConditionUnknown,
Message: "wait cluster synchro",
}
meta.SetStatusCondition(&clusterStatus.Conditions, healthyCondition)
}); err != nil {
klog.ErrorS(err, "Failed to update cluster validated condition status", "cluster", name, "condition", validatedCondition)
}
}
func (manager *Manager) UpdateClusterStatus(ctx context.Context, name string, status *clusterv1alpha2.ClusterStatus) error {
return manager.updateClusterStatus(ctx, name, func(clusterStatus *clusterv1alpha2.ClusterStatus) {
if status.Version != "" {
clusterStatus.Version = status.Version
}
if status.SyncResources != nil {
clusterStatus.SyncResources = status.SyncResources
}
for _, condition := range status.Conditions {
meta.SetStatusCondition(&clusterStatus.Conditions, condition)
}
})
}
func (manager *Manager) updateClusterStatus(ctx context.Context, name string, updateFunc func(status *clusterv1alpha2.ClusterStatus)) error {
return retry.RetryOnConflict(retry.DefaultRetry, func() error {
cluster, err := manager.clusterlister.Get(name)
if err != nil {
return err
}
lastStatus := cluster.Status
cluster = cluster.DeepCopy()
updateFunc(&cluster.Status)
// remove deprecated conditions
meta.RemoveStatusCondition(&cluster.Status.Conditions, clusterv1alpha2.ClusterSynchroInitializedCondition)
// TODO: need optimize?
readyCondition := metav1.Condition{
Type: clusterv1alpha2.ReadyCondition,
Status: metav1.ConditionTrue,
Reason: clusterv1alpha2.ReadyReason,
Message: "",
}
for _, condType := range []string{
clusterv1alpha2.ValidatedCondition,
clusterv1alpha2.SynchroRunningCondition,
clusterv1alpha2.ClusterHealthyCondition,
} {
cond := meta.FindStatusCondition(cluster.Status.Conditions, condType)
if cond != nil && cond.Status == metav1.ConditionTrue {
continue
}
readyCondition.Status = metav1.ConditionFalse
readyCondition.Reason = clusterv1alpha2.NotReadyReason
if cond == nil {
readyCondition.Message = fmt.Sprintf("%s condition is not found", condType)
} else {
readyCondition.Message = fmt.Sprintf("%s condition is %s, reason is %s", condType, cond.Status, cond.Reason)
}
break
}
meta.SetStatusCondition(&cluster.Status.Conditions, readyCondition)
if equality.Semantic.DeepEqual(cluster.Status, lastStatus) {
return nil
}
_, err = manager.clusterpediaclient.ClusterV1alpha2().PediaClusters().UpdateStatus(ctx, cluster, metav1.UpdateOptions{})
if err == nil {
klog.V(2).InfoS("Update Cluster Status", "cluster", cluster.Name, "conditions", cluster.Status.Conditions)
}
return err
})
}
func (manager *Manager) UpdateClusterShardingStatus(ctx context.Context, name string, shardingName *string) error {
return manager.updateClusterStatus(ctx, name, func(clusterStatus *clusterv1alpha2.ClusterStatus) {
clusterStatus.ShardingName = shardingName
})
}
func buildClusterConfig(cluster *clusterv1alpha2.PediaCluster) (*rest.Config, error) {
if len(cluster.Spec.Kubeconfig) != 0 {
clientconfig, err := clientcmd.NewClientConfigFromBytes(cluster.Spec.Kubeconfig)
if err != nil {
return nil, err
}
return clientconfig.ClientConfig()
}
if cluster.Spec.APIServer == "" {
return nil, errors.New("Cluster APIServer Endpoint is required")
}
if len(cluster.Spec.TokenData) == 0 &&
(len(cluster.Spec.CertData) == 0 || len(cluster.Spec.KeyData) == 0) {
return nil, errors.New("Cluster APIServer's Token or Cert is required")
}
config := &rest.Config{
Host: cluster.Spec.APIServer,
}
if len(cluster.Spec.CAData) != 0 {
config.TLSClientConfig.CAData = cluster.Spec.CAData
} else {
config.TLSClientConfig.Insecure = true
}
if len(cluster.Spec.CertData) != 0 && len(cluster.Spec.KeyData) != 0 {
config.TLSClientConfig.CertData = cluster.Spec.CertData
config.TLSClientConfig.KeyData = cluster.Spec.KeyData
}
if len(cluster.Spec.TokenData) != 0 {
config.BearerToken = string(cluster.Spec.TokenData)
}
return config, nil
}
type ItemExponentialFailureAndJitterSlowRateLimter struct {
failuresLock sync.Mutex
failures map[interface{}]int
maxFastAttempts int
fastBaseDelay time.Duration
fastMaxDelay time.Duration
slowBaseDelay time.Duration
slowMaxFactor float64
}
func NewItemExponentialFailureAndJitterSlowRateLimter(fastBaseDelay, fastMaxDelay, slowBaseDeploy time.Duration, slowMaxFactor float64, maxFastAttempts int) workqueue.RateLimiter {
if slowMaxFactor <= 0.0 {
slowMaxFactor = 1.0
}
return &ItemExponentialFailureAndJitterSlowRateLimter{
failures: map[interface{}]int{},
maxFastAttempts: maxFastAttempts,
fastBaseDelay: fastBaseDelay,
fastMaxDelay: fastMaxDelay,
slowBaseDelay: slowBaseDeploy,
slowMaxFactor: slowMaxFactor,
}
}
func (r *ItemExponentialFailureAndJitterSlowRateLimter) When(item interface{}) time.Duration {
r.failuresLock.Lock()
defer r.failuresLock.Unlock()
fastExp, num := r.failures[item], r.failures[item]+1
r.failures[item] = num
if num > r.maxFastAttempts {
return r.slowBaseDelay + time.Duration(rand.Float64()*r.slowMaxFactor*float64(r.slowBaseDelay))
}
// The backoff is capped such that 'calculated' value never overflows.
backoff := float64(r.fastBaseDelay.Nanoseconds()) * math.Pow(2, float64(fastExp))
if backoff > math.MaxInt64 {
return r.fastMaxDelay
}
calculated := time.Duration(backoff)
if calculated > r.fastMaxDelay {
return r.fastMaxDelay
}
return calculated
}
func (r *ItemExponentialFailureAndJitterSlowRateLimter) NumRequeues(item interface{}) int {
r.failuresLock.Lock()
defer r.failuresLock.Unlock()
return r.failures[item]
}
func (r *ItemExponentialFailureAndJitterSlowRateLimter) Forget(item interface{}) {
r.failuresLock.Lock()
defer r.failuresLock.Unlock()
delete(r.failures, item)
}