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scaled_object_reconciler.go
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scaled_object_reconciler.go
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package canary
import (
"context"
"fmt"
"math/rand"
"strings"
"time"
"go.uber.org/zap"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/util/retry"
flaggerv1 "github.com/fluxcd/flagger/pkg/apis/flagger/v1beta1"
keda "github.com/fluxcd/flagger/pkg/apis/keda/v1alpha1"
clientset "github.com/fluxcd/flagger/pkg/client/clientset/versioned"
"github.com/google/go-cmp/cmp"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// ScaledObjectReconciler is a ScalerReconciler that reconciles KEDA ScaledObjects.
type ScaledObjectReconciler struct {
kubeClient kubernetes.Interface
flaggerClient clientset.Interface
logger *zap.SugaredLogger
includeLabelPrefix []string
}
func (sor *ScaledObjectReconciler) ReconcilePrimaryScaler(cd *flaggerv1.Canary, init bool) error {
if cd.Spec.AutoscalerRef != nil {
if err := sor.reconcilePrimaryScaler(cd, init); err != nil {
return err
}
}
return nil
}
func (sor *ScaledObjectReconciler) reconcilePrimaryScaler(cd *flaggerv1.Canary, init bool) error {
primaryName := fmt.Sprintf("%s-primary", cd.Spec.TargetRef.Name)
targetSo, err := sor.flaggerClient.KedaV1alpha1().ScaledObjects(cd.Namespace).Get(context.TODO(), cd.Spec.AutoscalerRef.Name, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("Keda ScaledObject %s.%s get query error: %w",
cd.Spec.AutoscalerRef.Name, cd.Namespace, err)
}
targetSoClone := targetSo.DeepCopy()
setPrimaryScaledObjectQueries(cd, targetSoClone.Spec.Triggers)
soSpec := keda.ScaledObjectSpec{
ScaleTargetRef: &keda.ScaleTarget{
Name: primaryName,
Kind: targetSoClone.Spec.ScaleTargetRef.Kind,
APIVersion: targetSoClone.Spec.ScaleTargetRef.APIVersion,
EnvSourceContainerName: targetSoClone.Spec.ScaleTargetRef.EnvSourceContainerName,
},
PollingInterval: targetSoClone.Spec.PollingInterval,
CooldownPeriod: targetSoClone.Spec.CooldownPeriod,
MinReplicaCount: targetSoClone.Spec.MinReplicaCount,
MaxReplicaCount: targetSoClone.Spec.MaxReplicaCount,
Advanced: targetSoClone.Spec.Advanced,
Triggers: targetSoClone.Spec.Triggers,
Fallback: targetSoClone.Spec.Fallback,
IdleReplicaCount: targetSoClone.Spec.IdleReplicaCount,
}
if replicas := cd.Spec.AutoscalerRef.PrimaryScalerReplicas; replicas != nil {
if minReplicas := replicas.MinReplicas; minReplicas != nil {
soSpec.MinReplicaCount = minReplicas
}
if maxReplicas := replicas.MaxReplicas; maxReplicas != nil {
soSpec.MaxReplicaCount = maxReplicas
}
}
primarySoName := fmt.Sprintf("%s-primary", cd.Spec.AutoscalerRef.Name)
primarySo, err := sor.flaggerClient.KedaV1alpha1().ScaledObjects(cd.Namespace).Get(context.TODO(), primarySoName, metav1.GetOptions{})
if errors.IsNotFound(err) {
primarySo = &keda.ScaledObject{
ObjectMeta: makeObjectMeta(primarySoName, targetSoClone.Labels, cd),
Spec: soSpec,
}
_, err = sor.flaggerClient.KedaV1alpha1().ScaledObjects(cd.Namespace).Create(context.TODO(), primarySo, metav1.CreateOptions{})
if err != nil {
return fmt.Errorf("creating Keda ScaledObject %s.%s failed: %w",
primarySo.Name, primarySo.Namespace, err)
}
sor.logger.With("canary", fmt.Sprintf("%s.%s", cd.Name, cd.Namespace)).Infof(
"Keda ScaledObject %s.%s created", primarySo.GetName(), cd.Namespace)
return nil
} else if err != nil {
return fmt.Errorf("Keda ScaledObject %s.%s get query failed: %w",
primarySo.Name, primarySo.Namespace, err)
}
if primarySo != nil && !init {
if diff := cmp.Diff(soSpec, primarySo.Spec); diff != "" {
err = retry.RetryOnConflict(retry.DefaultBackoff, func() error {
primarySo, err := sor.flaggerClient.KedaV1alpha1().ScaledObjects(cd.Namespace).Get(context.TODO(), primarySoName, metav1.GetOptions{})
if err != nil {
return err
}
primarySoClone := primarySo.DeepCopy()
primarySoClone.Spec = soSpec
filteredAnnotations := includeLabelsByPrefix(primarySo.Annotations, sor.includeLabelPrefix)
primarySoClone.Annotations = filteredAnnotations
filteredLabels := includeLabelsByPrefix(primarySo.ObjectMeta.Labels, sor.includeLabelPrefix)
primarySoClone.Labels = filteredLabels
_, err = sor.flaggerClient.KedaV1alpha1().ScaledObjects(cd.Namespace).Update(context.TODO(), primarySoClone, metav1.UpdateOptions{})
return err
})
if err != nil {
return fmt.Errorf("updating ScaledObject %s.%s failed: %w", primarySoName, cd.Namespace, err)
}
}
}
return nil
}
func (sor *ScaledObjectReconciler) PauseTargetScaler(cd *flaggerv1.Canary) error {
err := retry.RetryOnConflict(retry.DefaultBackoff, func() error {
so, err := sor.flaggerClient.KedaV1alpha1().ScaledObjects(cd.Namespace).Get(context.TODO(), cd.Spec.AutoscalerRef.Name, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("Keda ScaledObject %s.%s get query error: %w",
cd.Spec.AutoscalerRef.Name, cd.Namespace, err)
}
soClone := so.DeepCopy()
if soClone.ObjectMeta.Annotations == nil {
soClone.ObjectMeta.Annotations = make(map[string]string)
}
soClone.ObjectMeta.Annotations[keda.PausedReplicasAnnotation] = "0"
_, err = sor.flaggerClient.KedaV1alpha1().ScaledObjects(cd.Namespace).Update(context.TODO(), soClone, metav1.UpdateOptions{})
return err
})
return err
}
func (sor *ScaledObjectReconciler) ResumeTargetScaler(cd *flaggerv1.Canary) error {
err := retry.RetryOnConflict(retry.DefaultBackoff, func() error {
so, err := sor.flaggerClient.KedaV1alpha1().ScaledObjects(cd.Namespace).Get(context.TODO(), cd.Spec.AutoscalerRef.Name, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("Keda ScaledObject %s.%s get query error: %w",
cd.Spec.AutoscalerRef.Name, cd.Namespace, err)
}
soClone := so.DeepCopy()
if soClone.ObjectMeta.Annotations != nil {
if _, ok := soClone.ObjectMeta.Annotations[keda.PausedReplicasAnnotation]; ok {
delete(soClone.Annotations, keda.PausedReplicasAnnotation)
}
}
_, err = sor.flaggerClient.KedaV1alpha1().ScaledObjects(cd.Namespace).Update(context.TODO(), soClone, metav1.UpdateOptions{})
return err
})
return err
}
var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
func randSeq() string {
rand.Seed(time.Now().UnixNano())
b := make([]rune, 10)
for i := range b {
b[i] = letters[rand.Intn(len(letters))]
}
return string(b)
}
// setPrimaryScaledObjectQueries accepts a list of ScaleTriggers and modifies the query
// for each of them.
func setPrimaryScaledObjectQueries(cd *flaggerv1.Canary, triggers []keda.ScaleTriggers) {
for _, trigger := range triggers {
if cd.Spec.AutoscalerRef.PrimaryScalerQueries != nil {
// If .spec.autoscalerRef.primaryScalerQueries is specified, the triggers must be named,
// otherwise it might lead to unexpected behaviour.
for name, query := range cd.Spec.AutoscalerRef.PrimaryScalerQueries {
if trigger.Name == name {
trigger.Metadata["query"] = query
}
}
} else {
for key, val := range trigger.Metadata {
if key == "query" {
// We could've used regex with negative look-arounds to avoid using a placeholder, but Go does
// not support them. We need them because, we need to replace both "podinfo" and "podinfo-canary"
// (assuming "podinfo" to be the targetRef name), with "podinfo-primary". This placeholder makes
// sure that we don't end up with a query which contains terms like "podinfo-primary-canary" or
// "podinfo-primary-primary". This is a best effort approach, and users should be encouraged to
// check the generated query and opt for using `autoscalerRef.primaryScalerQuery` if the former
// doesn't look correct.
placeholder := randSeq()
replaced := strings.ReplaceAll(val, fmt.Sprintf("%s-canary", cd.Spec.TargetRef.Name), placeholder)
replaced = strings.ReplaceAll(replaced, cd.Spec.TargetRef.Name, fmt.Sprintf("%s-primary", cd.Spec.TargetRef.Name))
replaced = strings.ReplaceAll(replaced, placeholder, fmt.Sprintf("%s-primary", cd.Spec.TargetRef.Name))
trigger.Metadata[key] = replaced
}
}
}
}
}