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resource.go
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resource.go
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/*
Copyright (c) 2021-2022 Nordix Foundation
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 common
import (
"fmt"
"os"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/yaml"
)
/* Example data layout of a resource template file:
templates:
- name: small
resources:
limits:
cpu: 100m
memory: 32Mi
requests:
cpu: 30m
memory: 16Mi
- name: medium
resources:
limits:
cpu: 200m
memory: 128Mi
requests:
cpu: 50m
memory: 32Mi
- name: large
resources:
limits:
cpu: "1"
memory: 256Mi
requests:
cpu: 200m
memory: 64Mi
- name: xlarge
resources:
limits:
cpu: "4"
memory: 512Mi
requests:
cpu: "2"
memory: 128Mi
*/
type NamedResourceRequirements struct {
Name string `json:"name" protobuf:"bytes,1,opt,name=name"`
Resources corev1.ResourceRequirements `json:"resources,omitempty" protobuf:"bytes,2,opt,name=resources"`
}
// ResourceRequirementTemplates -
// Describes the data layout of a resource requirement template file
type ResourceRequirementTemplates struct {
Templates []NamedResourceRequirements `json:"templates,omitempty" patchStrategy:"merge" patchMergeKey:"name" protobuf:"bytes,1,rep,name=templates"`
}
// getResourceRequirementTemplates -
// Reads resource requirement templates from file
func getResourceRequirementTemplates(f string) (*ResourceRequirementTemplates, error) {
data, err := os.Open(f)
if err != nil {
return nil, fmt.Errorf("open %s error: %s", f, err)
}
t := &ResourceRequirementTemplates{}
err = yaml.NewYAMLOrJSONDecoder(data, 4096).Decode(t)
if err != nil {
return nil, fmt.Errorf("decode %s error: %s", f, err)
}
return t, nil
}
// GetResourceRequirementAnnotation -
// Gets ResourceRequirementKey annotation based on param 'from'
func GetResourceRequirementAnnotation(from *metav1.ObjectMeta) (string, bool) {
val, ok := from.Annotations[ResourceRequirementKey]
return val, ok
}
// SetResourceRequirementAnnotation -
// Sets ResourceRequirementKey annotation based on param 'from'.
func SetResourceRequirementAnnotation(from *metav1.ObjectMeta, into *metav1.ObjectMeta) {
if val, ok := GetResourceRequirementAnnotation(from); ok && val != "" {
// annotatate param 'into' with ResourceRequirementKey
if into.Annotations == nil {
into.Annotations = make(map[string]string)
}
into.Annotations[ResourceRequirementKey] = val
} else {
// remove annotation from param 'into'
if _, ok := GetResourceRequirementAnnotation(into); ok {
delete(into.Annotations, ResourceRequirementKey)
}
}
}
// GetContainerResourceRequirements -
// Reads and searches template resource requirements for container.
// (A template resource requirement with param 'templateName' must exist for a match)
func GetContainerResourceRequirements(containerName, templateName string) (*corev1.ResourceRequirements, error) {
rrt, err := getResourceRequirementTemplates(fmt.Sprintf("%s/%s", ResourceRequirementTemplatePath, containerName))
if err != nil {
return nil, err
}
for _, template := range rrt.Templates {
if template.Name == templateName {
return &template.Resources, nil
}
}
return nil, fmt.Errorf("container %s, not found resource requirement template: %s", containerName, templateName)
}
// SetContainerResourceRequirements -
// Finds and sets resource requirements for container.
func SetContainerResourceRequirements(from *metav1.ObjectMeta, container *corev1.Container) error {
if val, ok := GetResourceRequirementAnnotation(from); ok && val != "" {
rr, err := GetContainerResourceRequirements(container.Name, val)
if err != nil {
return err
}
container.Resources = *rr
}
return nil
}