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akkacluster_controller.go
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/
akkacluster_controller.go
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package akkacluster
import (
"context"
"fmt"
"reflect"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
"sigs.k8s.io/controller-runtime/pkg/event"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
"sigs.k8s.io/controller-runtime/pkg/source"
appv1alpha1 "github.com/lightbend/akka-cluster-operator/pkg/apis/app/v1alpha1"
)
var log = logf.Log.WithName("controller_akkacluster")
// Add creates a new AkkaCluster Controller and adds it to the Manager. The Manager will
// set fields on the Controller and Start it when the Manager is Started.
func Add(mgr manager.Manager) error {
statusEvents := make(chan event.GenericEvent, 1024)
apiClient := mgr.GetClient()
r := &ReconcileAkkaCluster{
client: apiClient,
scheme: mgr.GetScheme(),
events: statusEvents,
statusActor: NewStatusActor(apiClient, statusEvents),
}
// Create a new controller
c, err := controller.New("akkacluster-controller", mgr, controller.Options{Reconciler: r})
if err != nil {
return err
}
// Watch for changes to primary resource AkkaCluster
err = c.Watch(&source.Kind{Type: &appv1alpha1.AkkaCluster{}}, &handler.EnqueueRequestForObject{})
if err != nil {
return err
}
// Watch for changes to all possible secondary resources
for _, obj := range allPossibleGeneratedResourceTypes() {
err = c.Watch(&source.Kind{Type: obj}, &handler.EnqueueRequestForOwner{
IsController: true,
OwnerType: &appv1alpha1.AkkaCluster{},
})
if err != nil {
return err
}
}
// watch for Akka Cluster status updates
err = c.Watch(&source.Channel{Source: r.events}, &handler.EnqueueRequestForObject{})
if err != nil {
return err
}
// watch for pod events to trigger status updates
// TODO: is this needed or are these percolating up to Deployment well enough?
// need to test with and without readiness, as they may be equivalent only with readiness
c.Watch(&source.Kind{Type: &corev1.Pod{}}, &handler.EnqueueRequestForOwner{
IsController: false,
OwnerType: &appv1alpha1.AkkaCluster{},
})
if err != nil {
return err
}
// debug watchers (this could be redone as debug predicates)
// c.Watch(&source.Kind{Type: &appsv1.Deployment{}}, &enqueueDebugger{})
// c.Watch(&source.Kind{Type: &corev1.Pod{}}, &enqueueDebugger{})
// c.Watch(&source.Kind{Type: &appv1alpha1.AkkaCluster{}}, &enqueueDebugger{})
return nil
}
var _ reconcile.Reconciler = &ReconcileAkkaCluster{}
// ReconcileAkkaCluster reconciles a AkkaCluster object
type ReconcileAkkaCluster struct {
// This client, initialized using mgr.Client() above, is a split client
// that reads objects from the cache and writes to the apiserver
client client.Client
scheme *runtime.Scheme
events chan event.GenericEvent
statusActor *StatusActor
}
// Reconcile reads that state of the cluster for a AkkaCluster object and makes changes based on the state read
// and what is in the AkkaCluster.Spec
// Note:
// The Controller will requeue the Request to be processed again if the returned error is non-nil or
// Result.Requeue is true, otherwise upon completion it will remove the work from the queue.
func (r *ReconcileAkkaCluster) Reconcile(request reconcile.Request) (reconcile.Result, error) {
reqLogger := log.WithValues("name", fmt.Sprintf("%s/%s", request.Namespace, request.Name))
reqLogger.Info("Reconciling AkkaCluster")
// Fetch the AkkaCluster instance
akkaCluster := &appv1alpha1.AkkaCluster{}
err := r.client.Get(context.TODO(), request.NamespacedName, akkaCluster)
if err != nil {
if errors.IsNotFound(err) {
// Request object not found, could have been deleted after reconcile request.
// Owned objects are automatically garbage collected. For additional cleanup logic use finalizers.
// Return and don't requeue
r.statusActor.StopPolling(request)
return reconcile.Result{}, nil
}
// Error reading the object - requeue the request.
return reconcile.Result{}, err
}
// generateResources populates akkaCluster with defaults and returns list of resources to check.
for _, wantedResource := range generateResources(akkaCluster) {
if err := controllerutil.SetControllerReference(akkaCluster, wantedResource, r.scheme); err != nil {
return reconcile.Result{}, err
}
kind := reflect.ValueOf(wantedResource).Elem().Type().String()
// Fetch this resource from cluster, if any.
clusterResource := wantedResource.DeepCopyObject()
err = r.client.Get(context.TODO(), request.NamespacedName, clusterResource)
if err != nil && errors.IsNotFound(err) {
// Create wanted resource. Next client.Get will at least fetch wantedResource and will eventually
// reflect the object as it is in the cluster.
if err := r.client.Create(context.TODO(), wantedResource); err != nil {
reqLogger.Info("Tried to create a new resource", "kind", kind, "error", err)
return reconcile.Result{}, err
}
reqLogger.Info("Creating resource", "kind", kind)
return reconcile.Result{Requeue: true}, nil
}
// Update cluster resource to wanted resource, if needed.
if !SubsetEqual(wantedResource, clusterResource) {
reqLogger.Info("applying update", "kind", kind, "match")
if err := r.client.Update(context.TODO(), wantedResource); err != nil {
reqLogger.Info("Tried to update resource", "kind", kind, "error", err)
return reconcile.Result{}, err
}
return reconcile.Result{Requeue: true}, nil
}
}
if r.statusActor != nil {
currentStatus := r.statusActor.GetStatus(request)
if nil != currentStatus {
if !reflect.DeepEqual(akkaCluster.Status, currentStatus) {
akkaCluster.Status = currentStatus
err := r.client.Status().Update(context.TODO(), akkaCluster)
if err != nil {
reqLogger.Info("update error", "err", err)
return reconcile.Result{}, err
}
reqLogger.Info("updated cluster status")
}
}
// StartPolling means: notify me if status for this cluster changes from what I've
// got so far. This could happen on the first reconcile, meaning status is unknown
// or nil, and we want to be notified when it becomes available. This could also
// happen on a reconcile triggered by a status update, in which case we want to
// first GetStatus() and update the cluster object, then poll for future change.
r.statusActor.StartPolling(akkaCluster)
}
return reconcile.Result{}, nil
}