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controller.go
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controller.go
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package database
import (
"github.com/dev4devs-com/postgresql-operator/pkg/apis/postgresql/v1alpha1"
"github.com/dev4devs-com/postgresql-operator/pkg/service"
"github.com/dev4devs-com/postgresql-operator/pkg/utils"
"k8s.io/api/apps/v1"
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/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
)
// Add creates a new Database 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 &ReconcileDatabase{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(utils.DatabaseControllerName, mgr, controller.Options{Reconciler: r})
if err != nil {
return err
}
// Watch for changes to primary resource Database
if err := c.Watch(&source.Kind{Type: &v1alpha1.Database{}}, &handler.EnqueueRequestForObject{}); err != nil {
return err
}
/** Watch for changes to secondary resource and create the owner Database **/
// Watch Deployment resource controlled and created by it
if err := service.Watch(c, &v1.Deployment{}, true, &v1alpha1.Database{}); err != nil {
return err
}
// Watch PersistenceVolumeClaim resource controlled and created by it
if err := service.Watch(c, &corev1.PersistentVolumeClaim{}, true, &v1alpha1.Database{}); err != nil {
return err
}
// Watch Service resource controlled and created by it
if err := service.Watch(c, &corev1.Service{}, true, &v1alpha1.Database{}); err != nil {
return err
}
return nil
}
// blank assignment to verify that ReconcileDatabase implements reconcile.Reconciler
var _ reconcile.Reconciler = &ReconcileDatabase{}
// ReconcileDatabase reconciles a Database object
type ReconcileDatabase 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
}
// Reconcile reads that state of the cluster for a Database object and makes changes based on the state read
// and what is in the Database.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 *ReconcileDatabase) Reconcile(request reconcile.Request) (reconcile.Result, error) {
reqLogger := utils.GetLoggerByRequestAndController(request, utils.DatabaseControllerName)
reqLogger.Info("Reconciling Database ...")
db, err := service.FetchDatabaseCR(request.Name, request.Namespace, r.client)
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
reqLogger.Info("Database resource not found. Ignoring since object must be deleted.")
return reconcile.Result{}, nil
}
// Error reading the object - requeue the request.
reqLogger.Error(err, "Failed to get Database.")
return reconcile.Result{}, err
}
// Add const values for mandatory specs
utils.AddDatabaseMandatorySpecs(db)
if err := r.createResources(db, request); err != nil {
reqLogger.Error(err, "Failed to create the secondary resource required for the Database CR")
return reconcile.Result{}, err
}
if err := r.manageResources(db); err != nil {
reqLogger.Error(err, "Failed to manage resource required for the Database CR")
return reconcile.Result{}, err
}
if err := r.createUpdateCRStatus(request); err != nil {
reqLogger.Error(err, "Failed to create and update the status in the Database CR")
return reconcile.Result{}, err
}
reqLogger.Info("Stop Reconciling Database ...")
return reconcile.Result{}, nil
}
//createResources will create the secondary resource which are required in order to make works successfully the primary resource(CR)
func (r *ReconcileDatabase) createResources(db *v1alpha1.Database, request reconcile.Request) error {
reqLogger := utils.GetLoggerByRequestAndController(request, utils.DatabaseControllerName)
reqLogger.Info("Creating secondary Database resources ...")
// Check if deployment for the app exist, if not create one
if err := r.createDeployment(db); err != nil {
reqLogger.Error(err, "Failed to create Deployment")
return err
}
// Check if service for the app exist, if not create one
if err := r.createService(db); err != nil {
reqLogger.Error(err, "Failed to create Service")
return err
}
// Check if PersistentVolumeClaim for the app exist, if not create one
if err := r.createPvc(db); err != nil {
reqLogger.Error(err, "Failed to create PVC")
return err
}
return nil
}
//createUpdateCRStatus will create and update the status in the CR applied in the cluster
func (r *ReconcileDatabase) createUpdateCRStatus(request reconcile.Request) error {
reqLogger := utils.GetLoggerByRequestAndController(request, utils.DatabaseControllerName)
reqLogger.Info("Create/Update Database status ...")
if err := r.updateDeploymentStatus(request); err != nil {
reqLogger.Error(err, "Failed to create Deployment Status")
return err
}
if err := r.updateServiceStatus(request); err != nil {
reqLogger.Error(err, "Failed to create Service Status")
return err
}
if err := r.updatePvcStatus(request); err != nil {
reqLogger.Error(err, "Failed to create PVC Status")
return err
}
if err := r.updateDBStatus(request); err != nil {
reqLogger.Error(err, "Failed to create DB Status")
return err
}
return nil
}