/
controller.go
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/
controller.go
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/*
Copyright 2020 yujunwang.
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 controllers
import (
"context"
"github.com/go-logr/logr"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/tools/record"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
ctrlcontroller "sigs.k8s.io/controller-runtime/pkg/controller"
prestooperatorv1alpha1 "github.com/kinderyj/presto-on-k8s-operator/api/v1alpha1"
)
// PrestoClusterReconciler reconciles a PrestoCluster object
type PrestoClusterReconciler struct {
client.Client
Log logr.Logger
Scheme *runtime.Scheme
Recorder record.EventRecorder
}
// +kubebuilder:rbac:groups=prestooperator.k8s.io,resources=prestoclusters,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=prestooperator.k8s.io,resources=prestoclusters/status,verbs=get;update;patch
// +kubebuilder:rbac:groups=apps,resources=deployments,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=apps,resources=deployments/status,verbs=get
// +kubebuilder:rbac:groups=core,resources=pods,verbs=get;list;watch
// +kubebuilder:rbac:groups=core,resources=pods/status,verbs=get
// +kubebuilder:rbac:groups=core,resources=services,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=core,resources=services/status,verbs=get
// +kubebuilder:rbac:groups=core,resources=events,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=core,resources=events/status,verbs=get
// +kubebuilder:rbac:groups=core,resources=configmaps,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=extensions,resources=ingresses,verbs=get;list;watch;create;update;patch;delete
// +kubebuilder:rbac:groups=extensions,resources=ingresses/status,verbs=get
// Reconcile implements the Reconciler interface in the controller-runime.
func (r *PrestoClusterReconciler) Reconcile(req ctrl.Request) (ctrl.Result, error) {
_ = context.Background()
_ = r.Log.WithValues("prestocluster", req.NamespacedName)
var log = r.Log.WithValues(
"cluster", req.NamespacedName)
var controller = PrestoClusterController{
k8sClient: r.Client,
request: req,
inspected: InspectedClusterState{},
context: context.Background(),
log: log,
recorder: r.Recorder,
}
return controller.reconcile(req)
}
// PrestoClusterController the context, inspected state and desired state for the reconcile request.
type PrestoClusterController struct {
k8sClient client.Client
request ctrl.Request
inspected InspectedClusterState
desired DesiredClusterState
context context.Context
log logr.Logger
recorder record.EventRecorder
}
func (controller *PrestoClusterController) reconcile(
request ctrl.Request) (ctrl.Result, error) {
var k8sClient = controller.k8sClient
var inspected = &controller.inspected
var desired = &controller.desired
var log = controller.log
var context = controller.context
var err error
log.Info("============ Reconcile Step 1: Inspect the current state.")
var inspector = ClusterStateInspector{
k8sClient: k8sClient,
request: request,
context: context,
log: log,
}
err = inspector.inspect(inspected)
if err != nil {
log.Error(err, "Failed to inspect the current state.")
return ctrl.Result{}, err
}
log.Info("============ Reconcile Step 2: Get the desired prestocluster object.")
*desired = getDesiredClusterState(inspected.cluster)
if desired.PrestoConfigMap != nil {
log.Info("Desired state", "PrestoConfigMap", *desired.PrestoConfigMap)
} else {
log.Info("Desired state", "PrestoConfigMap", "nil")
}
if desired.CatalogConfigMap != nil {
log.Info("Desired state", "CatalogConfigMap", *desired.CatalogConfigMap)
} else {
log.Info("Desired state", "CatalogConfigMap", "nil")
}
if desired.CoordinatorDeployment != nil {
log.Info("Desired state", "Coordinator deployment", *desired.CoordinatorDeployment)
} else {
log.Info("Desired state", "Coordinator deployment", "nil")
}
if desired.CoordinatorService != nil {
log.Info("Desired state", "Coordinator service", *desired.CoordinatorService)
} else {
log.Info("Desired state", "Coordinator service", "nil")
}
if desired.WorkerDeployment != nil {
log.Info("Desired state", "Worker deployment", *desired.WorkerDeployment)
} else {
log.Info("Desired state", "Worker deployment", "nil")
}
log.Info("============ Reconcile Step 3: start to reconcile.")
var reconciler = ClusterReconciler{
k8sClient: controller.k8sClient,
context: controller.context,
log: controller.log,
inspected: controller.inspected,
desired: controller.desired,
recorder: controller.recorder,
}
result, err := reconciler.reconcile()
if err != nil {
log.Error(err, "Failed to reconcile")
}
if result.RequeueAfter > 0 {
log.Info("Requeue reconcile request", "after", result.RequeueAfter)
}
// Finally, we update the status block of the PrestoCluster resource to reflect the
// current state of the world
log.Info("============ Reconcile Step 4: start to update Presto cluster Status.")
var statusUpdater = ClusterStatusUpdater{
k8sClient: controller.k8sClient,
context: controller.context,
log: controller.log,
recorder: controller.recorder,
inspected: controller.inspected,
}
if statusUpdater.inspected.cluster == nil {
statusUpdater.log.Info("The cluster has been deleted, no status to update")
return ctrl.Result{}, nil
}
result, err = statusUpdater.updatePrestoClusterStatus(request.Name, request.Namespace)
if err != nil {
return ctrl.Result{}, err
}
return result, err
}
// SetupWithManager defines the type of Object being *reconciled*, and configures the
// ControllerManagedBy to respond to create / delete /update events by *reconciling the object*.
func (r *PrestoClusterReconciler) SetupWithManager(mgr ctrl.Manager, maxConcurrentReconciles int) error {
return ctrl.NewControllerManagedBy(mgr).WithOptions(ctrlcontroller.Options{MaxConcurrentReconciles: maxConcurrentReconciles}).
For(&prestooperatorv1alpha1.PrestoCluster{}).
Complete(r)
}