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scaling.go
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scaling.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package kubernetes
import (
"context"
"fmt"
"time"
appsv1 "k8s.io/api/apps/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/gardener/gardener/pkg/utils/retry"
)
// ScaleStatefulSet scales a StatefulSet.
func ScaleStatefulSet(ctx context.Context, c client.Client, key client.ObjectKey, replicas int32) error {
statefulset := &appsv1.StatefulSet{
ObjectMeta: metav1.ObjectMeta{
Name: key.Name,
Namespace: key.Namespace,
},
}
return scaleResource(ctx, c, statefulset, replicas)
}
// ScaleDeployment scales a Deployment.
func ScaleDeployment(ctx context.Context, c client.Client, key client.ObjectKey, replicas int32) error {
deployment := &appsv1.Deployment{
ObjectMeta: metav1.ObjectMeta{
Name: key.Name,
Namespace: key.Namespace,
},
}
return scaleResource(ctx, c, deployment, replicas)
}
// scaleResource scales resource's 'spec.replicas' to replicas count
func scaleResource(ctx context.Context, c client.Client, obj client.Object, replicas int32) error {
patch := []byte(fmt.Sprintf(`{"spec":{"replicas":%d}}`, replicas))
return c.SubResource("scale").Patch(ctx, obj, client.RawPatch(types.MergePatchType, patch))
}
// WaitUntilDeploymentScaledToDesiredReplicas waits for the number of available replicas to be equal to the deployment's desired replicas count.
func WaitUntilDeploymentScaledToDesiredReplicas(ctx context.Context, client client.Client, key types.NamespacedName, desiredReplicas int32) error {
return retry.UntilTimeout(ctx, 5*time.Second, 300*time.Second, func(ctx context.Context) (done bool, err error) {
deployment := &appsv1.Deployment{}
if err := client.Get(ctx, key, deployment); err != nil {
return retry.SevereError(err)
}
if deployment.Generation != deployment.Status.ObservedGeneration {
return retry.MinorError(fmt.Errorf("%q not observed at latest generation (%d/%d)", key.Name,
deployment.Status.ObservedGeneration, deployment.Generation))
}
if deployment.Spec.Replicas == nil || *deployment.Spec.Replicas != desiredReplicas {
return retry.SevereError(fmt.Errorf("waiting for deployment %q to scale failed. spec.replicas does not match the desired replicas", key.Name))
}
if deployment.Status.Replicas == desiredReplicas && deployment.Status.AvailableReplicas == desiredReplicas {
return retry.Ok()
}
return retry.MinorError(fmt.Errorf("deployment %q currently has '%d' replicas. Desired: %d", key.Name, deployment.Status.AvailableReplicas, desiredReplicas))
})
}
// WaitUntilStatefulSetScaledToDesiredReplicas waits for the number of available replicas to be equal to the StatefulSet's desired replicas count.
func WaitUntilStatefulSetScaledToDesiredReplicas(ctx context.Context, client client.Client, key types.NamespacedName, desiredReplicas int32) error {
return retry.UntilTimeout(ctx, 5*time.Second, 300*time.Second, func(ctx context.Context) (done bool, err error) {
statefulSet := &appsv1.StatefulSet{}
if err := client.Get(ctx, key, statefulSet); err != nil {
return retry.SevereError(err)
}
if statefulSet.Generation != statefulSet.Status.ObservedGeneration {
return retry.MinorError(fmt.Errorf("statefullSet %q not observed at latest generation (%d/%d)", key.Name,
statefulSet.Status.ObservedGeneration, statefulSet.Generation))
}
if statefulSet.Spec.Replicas == nil || *statefulSet.Spec.Replicas != desiredReplicas {
if statefulSet.Spec.Replicas == nil {
return retry.SevereError(fmt.Errorf("waiting for statefulSet %q to scale failed. spec.replicas is nill. Generation %d", key.Name, statefulSet.Generation))
}
return retry.SevereError(fmt.Errorf("waiting for statefulSet %q to scale failed. spec.replicas does not match the desired replicas", key.Name))
}
if statefulSet.Status.Replicas == desiredReplicas && statefulSet.Status.AvailableReplicas == desiredReplicas {
return retry.Ok()
}
return retry.MinorError(fmt.Errorf("statefulSet %q currently has '%d' replicas. Desired: %d", key.Name, statefulSet.Status.AvailableReplicas, desiredReplicas))
})
}
// ScaleStatefulSetAndWaitUntilScaled scales a StatefulSet and wait until is scaled.
func ScaleStatefulSetAndWaitUntilScaled(ctx context.Context, c client.Client, key client.ObjectKey, replicas int32) error {
if err := ScaleStatefulSet(ctx, c, key, replicas); err != nil {
return err
}
return WaitUntilStatefulSetScaledToDesiredReplicas(ctx, c, key, replicas)
}