/
workload.go
187 lines (160 loc) · 4.27 KB
/
workload.go
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package kubernetes
import (
"errors"
appsv1 "k8s.io/api/apps/v1"
batchv1 "k8s.io/api/batch/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/cli-runtime/pkg/resource"
"k8s.io/client-go/kubernetes/scheme"
"github.com/slimtoolkit/slim/pkg/app/master/config"
)
const (
namespaceDefault = "default"
annotationDefaultContainer = "kubectl.kubernetes.io/default-container"
)
type Workload struct {
info *resource.Info
orig runtime.Object
targetContainerName string
}
func newWorkload(info *resource.Info, targetContainerName string) *Workload {
return &Workload{
info: info,
orig: info.Object.DeepCopyObject(),
targetContainerName: targetContainerName,
}
}
func (w *Workload) Namespace() string {
return w.info.Namespace
}
func (w *Workload) Name() string {
return w.info.Name
}
func (w *Workload) Info() *resource.Info {
return w.info
}
func (w *Workload) Template() *corev1.PodTemplateSpec {
switch obj := w.info.Object.(type) {
case *appsv1.DaemonSet:
return &obj.Spec.Template
case *appsv1.Deployment:
return &obj.Spec.Template
case *appsv1.ReplicaSet:
return &obj.Spec.Template
case *appsv1.StatefulSet:
return &obj.Spec.Template
case *batchv1.Job:
return &obj.Spec.Template
case *batchv1.CronJob:
return &obj.Spec.JobTemplate.Spec.Template
default:
// Shouldn't really happen...
return nil
}
}
func (w *Workload) Container(name string) *corev1.Container {
for _, c := range w.Template().Spec.Containers {
if c.Name == name {
return &c
}
}
return nil
}
func (w *Workload) DefaultContainer() *corev1.Container {
as := w.Template().Annotations
if as != nil && as[annotationDefaultContainer] != "" {
return w.Container(as[annotationDefaultContainer])
}
if len(w.Template().Spec.Containers) == 1 {
return &w.Template().Spec.Containers[0]
}
// No default
return nil
}
func (w *Workload) TargetContainer() *corev1.Container {
if w.targetContainerName == "" {
return w.DefaultContainer()
}
return w.Container(w.targetContainerName)
}
func (w *Workload) AddEmptyDirVolume(name string) {
w.Template().Spec.Volumes = append(w.Template().Spec.Volumes,
corev1.Volume{
Name: name,
VolumeSource: corev1.VolumeSource{
EmptyDir: &corev1.EmptyDirVolumeSource{},
},
})
}
func (w *Workload) AddInitContainer(cont corev1.Container) {
w.Template().Spec.InitContainers = append(w.Template().Spec.InitContainers, cont)
}
func (w *Workload) SetReplicasIfApplicable(n int32) bool {
switch obj := w.info.Object.(type) {
case *appsv1.Deployment:
obj.Spec.Replicas = &n
case *appsv1.ReplicaSet:
obj.Spec.Replicas = &n
case *appsv1.StatefulSet:
obj.Spec.Replicas = &n
default:
return false
}
return true
}
func (w *Workload) ResetChanges() {
w.info.Object = w.orig.DeepCopyObject()
w.info.ResourceVersion = ""
}
// WorkloadFinder searches for the workload object in:
// - supplied manifest files (if any)
// - default cluster
type WorkloadFinder struct {
manifests *Manifests
resourceBuilderFn ResourceBuilderFunc
}
func NewWorkloadFinder(manifests *Manifests, resourceBuilderFn ResourceBuilderFunc) *WorkloadFinder {
return &WorkloadFinder{
manifests: manifests,
resourceBuilderFn: resourceBuilderFn,
}
}
func (f *WorkloadFinder) Find(target config.KubernetesTarget) (*Workload, error) {
info, err := func() (*resource.Info, error) {
if f.manifests != nil {
return f.manifests.Find(target)
}
return f.findInCluster(target)
}()
if err != nil {
return nil, err
}
if info == nil {
return nil, nil
}
return newWorkload(info, target.Container), nil
}
func (f *WorkloadFinder) findInCluster(target config.KubernetesTarget) (*resource.Info, error) {
namespace := target.Namespace
if namespace == "" {
namespace = namespaceDefault
}
infos, err := f.resourceBuilderFn().
WithScheme(scheme.Scheme, scheme.Scheme.PrioritizedVersionsAllGroups()...).
NamespaceParam(namespace).
SingleResourceType().
ResourceTypeOrNameArgs(true, target.Workload).
Do().
Infos()
if err != nil {
return nil, err
}
if len(infos) == 0 {
return nil, errors.New("couldn't find workload in cluster")
}
if len(infos) > 1 {
return nil, errors.New("couldn't unambiguously identify workload in cluster")
}
return infos[0], nil
}