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eviction.go
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eviction.go
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// Copyright 2023 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 eviction implements a generic SetEviction interface for cloud products
package eviction
import (
agonesv1 "agones.dev/agones/pkg/apis/agones/v1"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
)
// SetEviction sets disruptions controls on a Pod based on GameServer.Status.Eviction.
func SetEviction(eviction *agonesv1.Eviction, pod *corev1.Pod) error {
if eviction == nil {
return errors.New("No eviction value set. Should be the default value")
}
if _, exists := pod.ObjectMeta.Annotations[agonesv1.PodSafeToEvictAnnotation]; !exists {
switch eviction.Safe {
case agonesv1.EvictionSafeAlways:
pod.ObjectMeta.Annotations[agonesv1.PodSafeToEvictAnnotation] = agonesv1.True
case agonesv1.EvictionSafeOnUpgrade, agonesv1.EvictionSafeNever:
// For EvictionSafeOnUpgrade and EvictionSafeNever, we block Cluster Autoscaler
// (on Autopilot, this enables Extended Duration pods, which is equivalent).
pod.ObjectMeta.Annotations[agonesv1.PodSafeToEvictAnnotation] = agonesv1.False
default:
return errors.Errorf("unknown eviction.safe value %q", string(eviction.Safe))
}
}
if _, exists := pod.ObjectMeta.Labels[agonesv1.SafeToEvictLabel]; !exists {
switch eviction.Safe {
case agonesv1.EvictionSafeAlways, agonesv1.EvictionSafeOnUpgrade:
// For EvictionSafeAlways and EvictionSafeOnUpgrade, we use a label value
// that does not match the agones-gameserver-safe-to-evict-false PDB. But
// we go ahead and label it, in case someone wants to adopt custom logic
// for this group of game servers.
pod.ObjectMeta.Labels[agonesv1.SafeToEvictLabel] = agonesv1.True
case agonesv1.EvictionSafeNever:
// For EvictionSafeNever, match gones-gameserver-safe-to-evict-false PDB.
pod.ObjectMeta.Labels[agonesv1.SafeToEvictLabel] = agonesv1.False
default:
return errors.Errorf("unknown eviction.safe value %q", string(eviction.Safe))
}
}
return nil
}