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controller.go
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controller.go
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// Copyright (C) 2021 ScyllaDB
package nodeconfig
import (
"context"
"fmt"
"sync"
"time"
scyllav1alpha1 "github.com/scylladb/scylla-operator/pkg/api/scylla/v1alpha1"
scyllav1alpha1client "github.com/scylladb/scylla-operator/pkg/client/scylla/clientset/versioned/typed/scylla/v1alpha1"
scyllav1alpha1informers "github.com/scylladb/scylla-operator/pkg/client/scylla/informers/externalversions/scylla/v1alpha1"
scyllav1alpha1listers "github.com/scylladb/scylla-operator/pkg/client/scylla/listers/scylla/v1alpha1"
"github.com/scylladb/scylla-operator/pkg/controllerhelpers"
"github.com/scylladb/scylla-operator/pkg/kubeinterfaces"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/labels"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
appsv1informers "k8s.io/client-go/informers/apps/v1"
corev1informers "k8s.io/client-go/informers/core/v1"
rbacv1informers "k8s.io/client-go/informers/rbac/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
corev1client "k8s.io/client-go/kubernetes/typed/core/v1"
appsv1listers "k8s.io/client-go/listers/apps/v1"
corev1listers "k8s.io/client-go/listers/core/v1"
rbacv1listers "k8s.io/client-go/listers/rbac/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
"k8s.io/klog/v2"
)
const (
ControllerName = "NodeConfigController"
// maxSyncDuration enforces preemption. Do not raise the value! Controllers shouldn't actively wait,
// but rather use the queue.
maxSyncDuration = 30 * time.Second
)
var (
keyFunc = cache.DeletionHandlingMetaNamespaceKeyFunc
nodeConfigControllerGVK = scyllav1alpha1.GroupVersion.WithKind("NodeConfig")
daemonSetControllerGVK = appsv1.SchemeGroupVersion.WithKind("DaemonSet")
)
type Controller struct {
kubeClient kubernetes.Interface
scyllaClient scyllav1alpha1client.ScyllaV1alpha1Interface
nodeConfigLister scyllav1alpha1listers.NodeConfigLister
scyllaOperatorConfigLister scyllav1alpha1listers.ScyllaOperatorConfigLister
clusterRoleLister rbacv1listers.ClusterRoleLister
clusterRoleBindingLister rbacv1listers.ClusterRoleBindingLister
daemonSetLister appsv1listers.DaemonSetLister
namespaceLister corev1listers.NamespaceLister
nodeLister corev1listers.NodeLister
serviceAccountLister corev1listers.ServiceAccountLister
cachesToSync []cache.InformerSynced
eventRecorder record.EventRecorder
queue workqueue.RateLimitingInterface
handlers *controllerhelpers.Handlers[*scyllav1alpha1.NodeConfig]
operatorImage string
}
func NewController(
kubeClient kubernetes.Interface,
scyllaClient scyllav1alpha1client.ScyllaV1alpha1Interface,
nodeConfigInformer scyllav1alpha1informers.NodeConfigInformer,
scyllaOperatorConfigInformer scyllav1alpha1informers.ScyllaOperatorConfigInformer,
clusterRoleInformer rbacv1informers.ClusterRoleInformer,
clusterRoleBindingInformer rbacv1informers.ClusterRoleBindingInformer,
daemonSetInformer appsv1informers.DaemonSetInformer,
namespaceInformer corev1informers.NamespaceInformer,
nodeInformer corev1informers.NodeInformer,
serviceAccountInformer corev1informers.ServiceAccountInformer,
operatorImage string,
) (*Controller, error) {
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartStructuredLogging(0)
eventBroadcaster.StartRecordingToSink(&corev1client.EventSinkImpl{Interface: kubeClient.CoreV1().Events("")})
ncc := &Controller{
kubeClient: kubeClient,
scyllaClient: scyllaClient,
nodeConfigLister: nodeConfigInformer.Lister(),
scyllaOperatorConfigLister: scyllaOperatorConfigInformer.Lister(),
clusterRoleLister: clusterRoleInformer.Lister(),
clusterRoleBindingLister: clusterRoleBindingInformer.Lister(),
daemonSetLister: daemonSetInformer.Lister(),
namespaceLister: namespaceInformer.Lister(),
nodeLister: nodeInformer.Lister(),
serviceAccountLister: serviceAccountInformer.Lister(),
cachesToSync: []cache.InformerSynced{
nodeConfigInformer.Informer().HasSynced,
scyllaOperatorConfigInformer.Informer().HasSynced,
clusterRoleInformer.Informer().HasSynced,
clusterRoleBindingInformer.Informer().HasSynced,
daemonSetInformer.Informer().HasSynced,
namespaceInformer.Informer().HasSynced,
nodeInformer.Informer().HasSynced,
serviceAccountInformer.Informer().HasSynced,
},
eventRecorder: eventBroadcaster.NewRecorder(scheme.Scheme, corev1.EventSource{Component: "NodeConfig-controller"}),
queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "NodeConfig"),
operatorImage: operatorImage,
}
var err error
ncc.handlers, err = controllerhelpers.NewHandlers[*scyllav1alpha1.NodeConfig](
ncc.queue,
keyFunc,
scheme.Scheme,
nodeConfigControllerGVK,
kubeinterfaces.GlobalGetList[*scyllav1alpha1.NodeConfig]{
GetFunc: func(name string) (*scyllav1alpha1.NodeConfig, error) {
return ncc.nodeConfigLister.Get(name)
},
ListFunc: func(selector labels.Selector) (ret []*scyllav1alpha1.NodeConfig, err error) {
return ncc.nodeConfigLister.List(selector)
},
},
)
if err != nil {
return nil, fmt.Errorf("can't create handlers: %w", err)
}
nodeConfigInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: ncc.addNodeConfig,
UpdateFunc: ncc.updateNodeConfig,
DeleteFunc: ncc.deleteNodeConfig,
})
// TODO: react to label changes on nodes
// nodeInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
// AddFunc: ncc.addNode,
// UpdateFunc: ncc.updateNode,
// DeleteFunc: ncc.deleteNode,
// })
scyllaOperatorConfigInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: ncc.addScyllaOperatorConfig,
UpdateFunc: ncc.updateScyllaOperatorConfig,
})
clusterRoleInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: ncc.addClusterRole,
UpdateFunc: ncc.updateClusterRole,
DeleteFunc: ncc.deleteClusterRole,
})
clusterRoleBindingInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: ncc.addClusterRoleBinding,
UpdateFunc: ncc.updateClusterRoleBinding,
DeleteFunc: ncc.deleteClusterRoleBinding,
})
serviceAccountInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: ncc.addServiceAccount,
UpdateFunc: ncc.updateServiceAccount,
DeleteFunc: ncc.deleteServiceAccount,
})
daemonSetInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: ncc.addDaemonSet,
UpdateFunc: ncc.updateDaemonSet,
DeleteFunc: ncc.deleteDaemonSet,
})
return ncc, nil
}
func (ncc *Controller) addDaemonSet(obj interface{}) {
ncc.handlers.HandleAdd(
obj.(*appsv1.DaemonSet),
ncc.handlers.EnqueueOwner,
)
}
func (ncc *Controller) updateDaemonSet(old, cur interface{}) {
ncc.handlers.HandleUpdate(
old.(*appsv1.DaemonSet),
cur.(*appsv1.DaemonSet),
ncc.handlers.EnqueueOwner,
ncc.deleteDaemonSet,
)
}
func (ncc *Controller) deleteDaemonSet(obj interface{}) {
ncc.handlers.HandleDelete(
obj,
ncc.handlers.EnqueueOwner,
)
}
func (ncc *Controller) addServiceAccount(obj interface{}) {
ncc.handlers.HandleAdd(
obj.(*corev1.ServiceAccount),
ncc.handlers.EnqueueOwner,
)
}
func (ncc *Controller) updateServiceAccount(old, cur interface{}) {
ncc.handlers.HandleUpdate(
old.(*corev1.ServiceAccount),
cur.(*corev1.ServiceAccount),
ncc.handlers.EnqueueOwner,
ncc.deleteServiceAccount,
)
}
func (ncc *Controller) deleteServiceAccount(obj interface{}) {
ncc.handlers.HandleDelete(
obj,
ncc.handlers.EnqueueOwner,
)
}
func (ncc *Controller) addClusterRoleBinding(obj interface{}) {
ncc.handlers.HandleAdd(
obj.(*rbacv1.ClusterRoleBinding),
ncc.handlers.EnqueueOwner,
)
}
func (ncc *Controller) updateClusterRoleBinding(old, cur interface{}) {
ncc.handlers.HandleUpdate(
old.(*rbacv1.ClusterRoleBinding),
cur.(*rbacv1.ClusterRoleBinding),
ncc.handlers.EnqueueOwner,
ncc.deleteClusterRoleBinding,
)
}
func (ncc *Controller) deleteClusterRoleBinding(obj interface{}) {
ncc.handlers.HandleDelete(
obj,
ncc.handlers.EnqueueOwner,
)
}
func (ncc *Controller) addClusterRole(obj interface{}) {
ncc.handlers.HandleAdd(
obj.(*rbacv1.ClusterRole),
ncc.handlers.EnqueueOwner,
)
}
func (ncc *Controller) updateClusterRole(old, cur interface{}) {
ncc.handlers.HandleUpdate(
old.(*rbacv1.ClusterRole),
cur.(*rbacv1.ClusterRole),
ncc.handlers.EnqueueOwner,
ncc.deleteClusterRole,
)
}
func (ncc *Controller) deleteClusterRole(obj interface{}) {
ncc.handlers.HandleDelete(
obj,
ncc.handlers.EnqueueOwner,
)
}
func (ncc *Controller) addNodeConfig(obj interface{}) {
ncc.handlers.HandleAdd(
obj.(*scyllav1alpha1.NodeConfig),
ncc.handlers.Enqueue,
)
}
func (ncc *Controller) updateNodeConfig(old, cur interface{}) {
ncc.handlers.HandleUpdate(
old.(*scyllav1alpha1.NodeConfig),
cur.(*scyllav1alpha1.NodeConfig),
ncc.handlers.Enqueue,
ncc.deleteNodeConfig,
)
}
func (ncc *Controller) deleteNodeConfig(obj interface{}) {
ncc.handlers.HandleDelete(
obj,
ncc.handlers.Enqueue,
)
}
func (ncc *Controller) addScyllaOperatorConfig(obj interface{}) {
ncc.handlers.HandleAdd(
obj.(*scyllav1alpha1.ScyllaOperatorConfig),
ncc.handlers.EnqueueAll,
)
}
func (ncc *Controller) updateScyllaOperatorConfig(old, cur interface{}) {
ncc.handlers.HandleUpdate(
old.(*scyllav1alpha1.ScyllaOperatorConfig),
cur.(*scyllav1alpha1.ScyllaOperatorConfig),
ncc.handlers.EnqueueAll,
nil,
)
}
func (ncc *Controller) processNextItem(ctx context.Context) bool {
key, quit := ncc.queue.Get()
if quit {
return false
}
defer ncc.queue.Done(key)
ctx, cancel := context.WithTimeout(ctx, maxSyncDuration)
defer cancel()
err := ncc.sync(ctx, key.(string))
// TODO: Do smarter filtering then just Reduce to handle cases like 2 conflict errors.
err = utilerrors.Reduce(err)
switch {
case err == nil:
ncc.queue.Forget(key)
return true
case apierrors.IsConflict(err):
klog.V(2).InfoS("Hit conflict, will retry in a bit", "Key", key, "Error", err)
case apierrors.IsAlreadyExists(err):
klog.V(2).InfoS("Hit already exists, will retry in a bit", "Key", key, "Error", err)
default:
utilruntime.HandleError(fmt.Errorf("syncing key '%v' failed: %v", key, err))
}
ncc.queue.AddRateLimited(key)
return true
}
func (ncc *Controller) runWorker(ctx context.Context) {
for ncc.processNextItem(ctx) {
}
}
func (ncc *Controller) Run(ctx context.Context, workers int) {
defer utilruntime.HandleCrash()
klog.InfoS("Starting controller", "controller", ControllerName)
var wg sync.WaitGroup
defer func() {
klog.InfoS("Shutting down controller", "controller", ControllerName)
ncc.queue.ShutDown()
wg.Wait()
klog.InfoS("Shut down controller", "controller", ControllerName)
}()
if !cache.WaitForNamedCacheSync(ControllerName, ctx.Done(), ncc.cachesToSync...) {
return
}
for i := 0; i < workers; i++ {
wg.Add(1)
go func() {
defer wg.Done()
wait.UntilWithContext(ctx, ncc.runWorker, time.Second)
}()
}
<-ctx.Done()
}