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controller.go
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controller.go
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/*
Copyright AppsCode Inc. and Contributors
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 statefulset
import (
"fmt"
"kubedb.dev/apimachinery/apis/kubedb"
api "kubedb.dev/apimachinery/apis/kubedb/v1alpha2"
db_cs "kubedb.dev/apimachinery/client/clientset/versioned"
amc "kubedb.dev/apimachinery/pkg/controller"
apps "k8s.io/api/apps/v1"
core "k8s.io/api/core/v1"
kerr "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
"k8s.io/klog/v2"
core_util "kmodules.xyz/client-go/core/v1"
"kmodules.xyz/client-go/tools/queue"
)
type Controller struct {
*amc.Config
// Kubernetes client
Client kubernetes.Interface
// KubeDB client
DBClient db_cs.Interface
// Dynamic client
DynamicClient dynamic.Interface
}
func NewController(
config *amc.Config,
client kubernetes.Interface,
dbClient db_cs.Interface,
dmClient dynamic.Interface,
) *Controller {
return &Controller{
Config: config,
Client: client,
DBClient: dbClient,
DynamicClient: dmClient,
}
}
func (c *Controller) InitStsWatcher() {
klog.Infoln("Initializing StatefulSet watcher.....")
// Initialize RestoreSession Watcher
c.StsInformer = c.KubeInformerFactory.Apps().V1().StatefulSets().Informer()
c.StsQueue = queue.New(api.ResourceKindStatefulSet, c.MaxNumRequeues, c.NumThreads, c.processStatefulSet)
c.StsLister = c.KubeInformerFactory.Apps().V1().StatefulSets().Lister()
c.StsInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
if sts, ok := obj.(*apps.StatefulSet); ok {
if c.RestrictToNamespace != core.NamespaceAll {
if sts.GetNamespace() != c.RestrictToNamespace {
klog.Infof("Skipping StatefulSet %s/%s. Only %s namespace is supported for Community Edition. Please upgrade to Enterprise to use any namespace.", sts.GetNamespace(), sts.GetName(), c.RestrictToNamespace)
return
}
}
c.enqueueOnlyKubeDBSts(sts)
}
},
UpdateFunc: func(oldObj, newObj interface{}) {
if sts, ok := newObj.(*apps.StatefulSet); ok {
if c.RestrictToNamespace != core.NamespaceAll {
if sts.GetNamespace() != c.RestrictToNamespace {
klog.Infof("Skipping StatefulSet %s/%s. Only %s namespace is supported for Community Edition. Please upgrade to Enterprise to use any namespace.", sts.GetNamespace(), sts.GetName(), c.RestrictToNamespace)
return
}
}
c.enqueueOnlyKubeDBSts(sts)
}
},
DeleteFunc: func(obj interface{}) {
var sts *apps.StatefulSet
var ok bool
if sts, ok = obj.(*apps.StatefulSet); !ok {
tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
if !ok {
klog.V(5).Info("error decoding object, invalid type")
return
}
sts, ok = tombstone.Obj.(*apps.StatefulSet)
if !ok {
utilruntime.HandleError(fmt.Errorf("error decoding object tombstone, invalid type"))
return
}
klog.V(5).Infof("Recovered deleted object '%v' from tombstone", tombstone.Obj.(metav1.Object).GetName())
}
if c.RestrictToNamespace != core.NamespaceAll {
if sts.GetNamespace() != c.RestrictToNamespace {
klog.Infof("Skipping StatefulSet %s/%s. Only %s namespace is supported for Community Edition. Please upgrade to Enterprise to use any namespace.", sts.GetNamespace(), sts.GetName(), c.RestrictToNamespace)
return
}
}
ok, _, err := core_util.IsOwnerOfGroup(metav1.GetControllerOf(sts), kubedb.GroupName)
if err != nil || !ok {
klog.Warningln(err)
return
}
dbInfo, err := c.extractDatabaseInfo(sts)
if err != nil {
if !kerr.IsNotFound(err) {
klog.Warningf("failed to extract database info from StatefulSet: %s/%s. Reason: %v", sts.Namespace, sts.Name, err)
}
return
}
err = c.ensureReadyReplicasCond(dbInfo)
if err != nil {
klog.Warningf("failed to update ReadyReplicas condition. Reason: %v", err)
return
}
},
})
}
func (c *Controller) enqueueOnlyKubeDBSts(sts *apps.StatefulSet) {
// only enqueue if the controlling owner is a KubeDB resource
ok, _, err := core_util.IsOwnerOfGroup(metav1.GetControllerOf(sts), kubedb.GroupName)
if err != nil {
klog.Warningf("failed to enqueue StatefulSet: %s/%s. Reason: %v", sts.Namespace, sts.Name, err)
return
}
if ok {
queue.Enqueue(c.StsQueue.GetQueue(), cache.ExplicitKey(sts.Namespace+"/"+sts.Name))
}
}
func (c *Controller) processStatefulSet(key string) error {
klog.Infof("Started processing, key: %v", key)
obj, exists, err := c.StsInformer.GetIndexer().GetByKey(key)
if err != nil {
klog.Errorf("Fetching object with key %s from store failed with %v", key, err)
return err
}
if !exists {
klog.V(5).Infof("StatefulSet %s does not exist anymore", key)
} else {
sts := obj.(*apps.StatefulSet).DeepCopy()
dbInfo, err := c.extractDatabaseInfo(sts)
if err != nil {
return fmt.Errorf("failed to extract database info from StatefulSet: %s/%s. Reason: %v", sts.Namespace, sts.Name, err)
}
return c.ensureReadyReplicasCond(dbInfo)
}
return nil
}