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statefulsets.go
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statefulsets.go
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package appstate
import (
"context"
"log"
"time"
"github.com/replicatedhq/kots/pkg/appstate/types"
appsv1 "k8s.io/api/apps/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
labels "k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
)
const (
StatefulSetResourceKind = "statefulset"
StatefulSetPodVersionLabel = "controller-revision-hash"
StatefulSetOwnerKind = "StatefulSet"
)
type statefulSetEventHandler struct {
informers []types.StatusInformer
resourceStateCh chan<- types.ResourceState
clientset kubernetes.Interface
targetNamespace string
}
func init() {
registerResourceKindNames(StatefulSetResourceKind, "statefulsets", "sts")
}
func runStatefulSetController(
ctx context.Context, clientset kubernetes.Interface, targetNamespace string,
informers []types.StatusInformer, resourceStateCh chan<- types.ResourceState,
) {
listwatch := &cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
return clientset.AppsV1().StatefulSets(targetNamespace).List(context.TODO(), options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
return clientset.AppsV1().StatefulSets(targetNamespace).Watch(context.TODO(), options)
},
}
informer := cache.NewSharedInformer(
listwatch,
&appsv1.StatefulSet{},
time.Minute,
)
eventHandler := &statefulSetEventHandler{
informers: informers,
resourceStateCh: resourceStateCh,
clientset: clientset,
targetNamespace: targetNamespace,
}
runInformer(ctx, informer, eventHandler)
return
}
func (h *statefulSetEventHandler) ObjectCreated(obj interface{}) {
r := h.cast(obj)
if _, ok := h.getInformer(r); !ok {
return
}
h.resourceStateCh <- makeStatefulSetResourceState(r, CalculateStatefulSetState(h.clientset, h.targetNamespace, r))
}
func (h *statefulSetEventHandler) ObjectUpdated(obj interface{}) {
r := h.cast(obj)
if _, ok := h.getInformer(r); !ok {
return
}
h.resourceStateCh <- makeStatefulSetResourceState(r, CalculateStatefulSetState(h.clientset, h.targetNamespace, r))
}
func (h *statefulSetEventHandler) ObjectDeleted(obj interface{}) {
r := h.cast(obj)
if _, ok := h.getInformer(r); !ok {
return
}
h.resourceStateCh <- makeStatefulSetResourceState(r, types.StateMissing)
}
func (h *statefulSetEventHandler) cast(obj interface{}) *appsv1.StatefulSet {
r, _ := obj.(*appsv1.StatefulSet)
return r
}
func (h *statefulSetEventHandler) getInformer(r *appsv1.StatefulSet) (types.StatusInformer, bool) {
if r != nil {
for _, informer := range h.informers {
if r.Namespace == informer.Namespace && r.Name == informer.Name {
return informer, true
}
}
}
return types.StatusInformer{}, false
}
func makeStatefulSetResourceState(r *appsv1.StatefulSet, state types.State) types.ResourceState {
return types.ResourceState{
Kind: StatefulSetResourceKind,
Name: r.Name,
Namespace: r.Namespace,
State: state,
}
}
func CalculateStatefulSetState(clientset kubernetes.Interface, targetNamespace string, r *appsv1.StatefulSet) types.State {
if r == nil {
return types.StateMissing
}
if r.Status.ObservedGeneration != r.ObjectMeta.Generation {
return types.StateUpdating
}
listOptions := metav1.ListOptions{LabelSelector: labels.SelectorFromSet(r.Spec.Selector.MatchLabels).String()}
pods, err := clientset.CoreV1().Pods(targetNamespace).List(context.TODO(), listOptions)
if err != nil {
log.Printf("failed to get statefulset pod list: %s", err)
return types.StateUnavailable
}
// If the pod version labels are not all the same, then the statefulset is updating.
currentVersion := ""
for _, pod := range pods.Items {
validOwner := false
for _, owner := range pod.ObjectMeta.OwnerReferences {
if owner.Kind == StatefulSetOwnerKind && owner.Name == r.ObjectMeta.Name {
validOwner = true
break
}
}
if !validOwner {
log.Printf("skipping pod %s due to invalid owner reference for statefulset %s", pod.ObjectMeta.Name, r.ObjectMeta.Name)
continue
}
version, exists := pod.Labels[StatefulSetPodVersionLabel]
if !exists {
log.Printf("failed to find %s label for pod %s", StatefulSetPodVersionLabel, pod.Name)
return types.StateUnavailable
}
if len(currentVersion) == 0 {
currentVersion = version
} else if version != currentVersion {
return types.StateUpdating
}
}
var desiredReplicas int32
if r.Spec.Replicas == nil {
desiredReplicas = 1
} else {
desiredReplicas = *r.Spec.Replicas
}
if r.Status.ReadyReplicas >= desiredReplicas {
return types.StateReady
}
if r.Status.ReadyReplicas > 0 {
return types.StateDegraded
}
return types.StateUnavailable
}