/
resource-scaler.go
72 lines (64 loc) · 2.4 KB
/
resource-scaler.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
// Copyright 2019-2024 The Liqo Authors
//
// 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 resourcemonitors
import (
"context"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/resource"
)
// ResourceScaler scales the resources of a ResourceReader by a given amount.
// It is used to let one reserve resources for local usage and not share them (Factor < 1).
type ResourceScaler struct {
Provider ResourceReader
Factor float32
Notifier ResourceUpdateNotifier
}
// Register sets an update notifier.
func (s *ResourceScaler) Register(ctx context.Context, notifier ResourceUpdateNotifier) {
s.Notifier = notifier
s.Provider.Register(ctx, notifier)
}
// ReadResources returns the provider's resources scaled by the given amount.
func (s *ResourceScaler) ReadResources(ctx context.Context, clusterID string) ([]*ResourceList, error) {
resources, err := s.Provider.ReadResources(ctx, clusterID)
if err != nil {
return nil, err
}
for i := range resources {
for resourceName, quantity := range resources[i].Resources {
scaled := quantity
ScaleResources(corev1.ResourceName(resourceName), scaled, s.Factor)
resources[i].Resources[resourceName] = scaled
}
}
return resources, nil
}
// RemoveClusterID removes the given clusterID from the provider.
func (s *ResourceScaler) RemoveClusterID(ctx context.Context, clusterID string) error {
s.Provider.RemoveClusterID(ctx, clusterID)
return nil
}
// ScaleResources multiplies a resource by a factor.
func ScaleResources(resourceName corev1.ResourceName, quantity *resource.Quantity, factor float32) {
switch resourceName {
case corev1.ResourceCPU:
// use millis
quantity.SetScaled(int64(float32(quantity.MilliValue())*factor), resource.Milli)
case corev1.ResourceMemory:
// use mega
quantity.SetScaled(int64(float32(quantity.ScaledValue(resource.Mega))*factor), resource.Mega)
default:
quantity.Set(int64(float32(quantity.Value()) * factor))
}
}