seedresourcesuptodatecondition_controller.go

/*
Copyright 2020 The Kubermatic Kubernetes Platform 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 seedresourcesuptodatecondition

import (
	"context"
	"fmt"
	"reflect"

	"go.uber.org/zap"

	controllerutil "github.com/kubermatic/kubermatic/api/pkg/controller/util"
	kubermaticv1 "github.com/kubermatic/kubermatic/api/pkg/crd/kubermatic/v1"
	kubermaticv1helper "github.com/kubermatic/kubermatic/api/pkg/crd/kubermatic/v1/helper"

	appsv1 "k8s.io/api/apps/v1"
	corev1 "k8s.io/api/core/v1"
	kerrors "k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/client-go/tools/record"
	ctrlruntimeclient "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"
	"sigs.k8s.io/controller-runtime/pkg/source"
)

const ControllerName = "seed_resources_up_to_date_condition_controller"

func Add(
	ctx context.Context,
	log *zap.SugaredLogger,
	mgr manager.Manager,
	numWorkers int,
	workerName string,
) error {
	r := &reconciler{
		ctx:        ctx,
		log:        log.Named(ControllerName),
		client:     mgr.GetClient(),
		recorder:   mgr.GetEventRecorderFor(ControllerName),
		workerName: workerName,
	}

	ctrlOptions := controller.Options{
		Reconciler:              r,
		MaxConcurrentReconciles: numWorkers,
	}
	c, err := controller.New(ControllerName, mgr, ctrlOptions)
	if err != nil {
		return err
	}

	typesToWatch := []runtime.Object{
		&appsv1.Deployment{},
		&appsv1.StatefulSet{},
	}
	for _, t := range typesToWatch {
		if err := c.Watch(&source.Kind{Type: t}, controllerutil.EnqueueClusterForNamespacedObject(mgr.GetClient())); err != nil {
			return fmt.Errorf("failed to create watch for %T: %v", t, err)
		}
	}

	return c.Watch(&source.Kind{Type: &kubermaticv1.Cluster{}}, &handler.EnqueueRequestForObject{})
}

type reconciler struct {
	ctx        context.Context
	log        *zap.SugaredLogger
	client     ctrlruntimeclient.Client
	recorder   record.EventRecorder
	workerName string
}

func (r *reconciler) Reconcile(request reconcile.Request) (reconcile.Result, error) {
	cluster := &kubermaticv1.Cluster{}
	if err := r.client.Get(r.ctx, request.NamespacedName, cluster); err != nil {
		if kerrors.IsNotFound(err) {
			return reconcile.Result{}, nil
		}
		return reconcile.Result{}, fmt.Errorf("failed to get cluster %q: %v", request.Name, err)
	}

	// Add a wrapping here so we can emit an event on error
	err := r.reconcile(cluster)
	if err != nil {
		r.log.With("cluster", request.Name).Errorw("Failed to reconcile cluster", zap.Error(err))
		r.recorder.Event(cluster, corev1.EventTypeWarning, "ReconcilingError", err.Error())
	}
	return reconcile.Result{}, err
}

func (r *reconciler) reconcile(cluster *kubermaticv1.Cluster) error {
	if r.workerName != cluster.Labels[kubermaticv1.WorkerNameLabelKey] {
		return nil
	}

	if cluster.Spec.Pause {
		return nil
	}

	upToDate, err := r.seedResourcesUpToDate(cluster)
	if err != nil {
		return err
	}

	oldCluster := cluster.DeepCopy()
	if !upToDate {
		kubermaticv1helper.SetClusterCondition(
			cluster,
			kubermaticv1.ClusterConditionSeedResourcesUpToDate,
			corev1.ConditionFalse,
			kubermaticv1.ReasonClusterUpdateSuccessful,
			"Some control plane components did not finish updating",
		)
	} else {
		kubermaticv1helper.SetClusterCondition(
			cluster,
			kubermaticv1.ClusterConditionSeedResourcesUpToDate,
			corev1.ConditionTrue,
			kubermaticv1.ReasonClusterUpdateSuccessful,
			"All control plane components are up to date",
		)
	}
	if reflect.DeepEqual(oldCluster, cluster) {
		return nil
	}

	return r.client.Patch(r.ctx, cluster, ctrlruntimeclient.MergeFrom(oldCluster))
}

func (r *reconciler) seedResourcesUpToDate(cluster *kubermaticv1.Cluster) (bool, error) {

	listOpts := &ctrlruntimeclient.ListOptions{Namespace: cluster.Status.NamespaceName}

	statefulSets := &appsv1.StatefulSetList{}
	if err := r.client.List(r.ctx, statefulSets, listOpts); err != nil {
		return false, fmt.Errorf("failed to list statefulSets: %v", err)
	}
	for _, statefulSet := range statefulSets.Items {
		if statefulSet.Spec.Replicas == nil {
			return false, nil
		}
		if *statefulSet.Spec.Replicas != statefulSet.Status.UpdatedReplicas ||
			*statefulSet.Spec.Replicas != statefulSet.Status.CurrentReplicas ||
			*statefulSet.Spec.Replicas != statefulSet.Status.ReadyReplicas {
			return false, nil
		}
	}

	deployments := &appsv1.DeploymentList{}
	if err := r.client.List(r.ctx, deployments, listOpts); err != nil {
		return false, fmt.Errorf("failed to list deployments: %v", err)
	}

	for _, deployment := range deployments.Items {
		if deployment.Spec.Replicas == nil {
			return false, nil
		}
		if *deployment.Spec.Replicas != deployment.Status.UpdatedReplicas ||
			*deployment.Spec.Replicas != deployment.Status.AvailableReplicas ||
			*deployment.Spec.Replicas != deployment.Status.ReadyReplicas {
			return false, nil
		}
	}

	return true, nil
}