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cassandracluster_controller.go
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cassandracluster_controller.go
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// Copyright 2019 Orange
//
// 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 cassandracluster
import (
"context"
"time"
"github.com/sirupsen/logrus"
api "github.com/Orange-OpenSource/cassandra-k8s-operator/pkg/apis/db/v1alpha1"
appsv1 "k8s.io/api/apps/v1"
policyv1beta1 "k8s.io/api/policy/v1beta1"
"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/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"
)
var log = logf.Log.WithName("controller_cassandracluster")
// Add creates a new CassandraCluster 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 {
return add(mgr, newReconciler(mgr))
}
// newReconciler returns a new reconcile.Reconciler
func newReconciler(mgr manager.Manager) reconcile.Reconciler {
return &ReconcileCassandraCluster{client: mgr.GetClient(), scheme: mgr.GetScheme()}
}
// add adds a new Controller to mgr with r as the reconcile.Reconciler
func add(mgr manager.Manager, r reconcile.Reconciler) error {
// Create a new controller
c, err := controller.New("cassandracluster-controller", mgr, controller.Options{Reconciler: r})
if err != nil {
return err
}
// Watch for changes to primary resource CassandraCluster
err = c.Watch(&source.Kind{Type: &api.CassandraCluster{}}, &handler.EnqueueRequestForObject{})
if err != nil {
return err
}
// TODO(user): Modify this to be the types you create that are owned by the primary resource
/* We currently don't have secondary resource to watch
// Modify this to be the types you create that are owned by the primary resource
// Watch for changes to secondary resource Pods and requeue the owner CassandraCluster
err = c.Watch(&source.Kind{Type: &corev1.Pod{}}, &handler.EnqueueRequestForOwner{
IsController: true,
OwnerType: &dbv1alpha1.CassandraCluster{},
})
if err != nil {
return err
}
*/
return nil
}
var _ reconcile.Reconciler = &ReconcileCassandraCluster{}
// ReconcileCassandraCluster reconciles a CassandraCluster object
type ReconcileCassandraCluster struct {
// This client, initialized using mgr.Client() above, is a split client
// that reads objects from the cache and writes to the apiserver
cc *api.CassandraCluster
client client.Client
scheme *runtime.Scheme
storedPdb *policyv1beta1.PodDisruptionBudget
storedStatefulSet *appsv1.StatefulSet
}
// Reconcile reads that state of the cluster for a CassandraCluster object and makes changes based on the state read
// and what is in the CassandraCluster.Spec
// a Pod as an example
// 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 (rcc *ReconcileCassandraCluster) Reconcile(request reconcile.Request) (reconcile.Result, error) {
reqLogger := log.WithValues("Request.Namespace", request.Namespace, "Request.Name", request.Name)
reqLogger.Info("Reconciling CassandraCluster")
requeue30 := reconcile.Result{RequeueAfter: 30 * time.Second}
requeue5 := reconcile.Result{RequeueAfter: 5 * time.Second}
requeue := reconcile.Result{Requeue: true}
forget := reconcile.Result{}
// Fetch the CassandraCluster instance
rcc.cc = &api.CassandraCluster{}
cc := rcc.cc
err := rcc.client.Get(context.TODO(), request.NamespacedName, cc)
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
return forget, nil
}
// Error reading the object - requeue the request.
return forget, err
}
// After first time reconcile, phase will switch to "Initializing".
if cc.Status.Phase == "" {
// Simulate initializer.
changed := cc.SetDefaults()
if changed {
updateDeletePvcStrategy(cc)
logrus.WithFields(logrus.Fields{"cluster": cc.Name}).Info("Initialization: Update CassandraCluster")
return requeue, rcc.client.Update(context.TODO(), cc)
}
}
err = rcc.CheckDeletePVC(cc)
if err != nil {
return forget, err
}
status := cc.Status.DeepCopy()
//We Update Status at the end
defer rcc.updateCassandraStatus(cc, status)
//If non allowed changes on CRD, we exit until an operator fix the CRD
if rcc.CheckNonAllowedChanged(cc, status) {
return requeue30, nil
}
if err = rcc.ensureCassandraPodDisruptionBudget(cc); err != nil {
logrus.WithFields(logrus.Fields{"cluster": cc.Name}).Errorf("ensureCassandraPodDisruptionBudget Error: %v", err)
}
//ReconcileRack will also add and initiate new racks, we must not go through racks before this method
err = rcc.ReconcileRack(cc, status)
if err != nil {
return requeue5, err
}
//Do we need to UpdateSeedList
FlipCassandraClusterUpdateSeedListStatus(cc, status)
UpdateCassandraClusterStatusPhase(cc, status)
//We could set different requeue based on current Operation
return requeue5, nil
}