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fleetautoscalers.go
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fleetautoscalers.go
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/*
* Copyright 2018 Google Inc. 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 (
"math"
stablev1alpha1 "agones.dev/agones/pkg/apis/stable/v1alpha1"
"k8s.io/apimachinery/pkg/util/intstr"
)
// computeDesiredFleetSize computes the new desired size of the given fleet
func computeDesiredFleetSize(fas *stablev1alpha1.FleetAutoscaler, f *stablev1alpha1.Fleet) (int32, bool, error) {
switch fas.Spec.Policy.Type {
case stablev1alpha1.BufferPolicyType:
return applyBufferPolicy(fas.Spec.Policy.Buffer, f)
}
return f.Status.Replicas, false, nil
}
func applyBufferPolicy(b *stablev1alpha1.BufferPolicy, f *stablev1alpha1.Fleet) (int32, bool, error) {
var replicas int32
if b.BufferSize.Type == intstr.Int {
replicas = f.Status.AllocatedReplicas + int32(b.BufferSize.IntValue())
} else {
// the percentage value is a little more complex, as we can't apply
// the desired percentage to any current value, but to the future one
// Example: we have 8 allocated replicas, 10 total replicas and bufferSize set to 30%
// 30% means that we must have 30% ready instances in the fleet
// Right now there are 20%, so we must increase the fleet until we reach 30%
// To compute the new size, we start from the other end: if ready must be 30%
// it means that allocated must be 70% and adjust the fleet size to make that true.
bufferPercent, err := intstr.GetValueFromIntOrPercent(&b.BufferSize, 100, true)
if err != nil {
return f.Status.Replicas, false, err
}
// use Math.Ceil to round the result up
replicas = int32(math.Ceil(float64(f.Status.AllocatedReplicas*100) / float64(100-bufferPercent)))
}
limited := false
if replicas < b.MinReplicas {
replicas = b.MinReplicas
limited = true
}
if replicas > b.MaxReplicas {
replicas = b.MaxReplicas
limited = true
}
return replicas, limited, nil
}