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deploymentController.go
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/
deploymentController.go
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package controllers
import (
"context"
"fmt"
"k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/log"
k8sv1 "github.com/cloudogu/k8s-dogu-operator/api/v1"
)
const legacyDoguLabel = "dogu"
// deploymentReconciler watches every Deployment object in the cluster and creates ingress objects when the ready state
// of a dogu changes between ready <-> not ready.
type deploymentReconciler struct {
updater IngressUpdater
client client.Client
}
// NewDeploymentReconciler creates a new deployment reconciler.
func NewDeploymentReconciler(client client.Client, updater IngressUpdater) *deploymentReconciler {
return &deploymentReconciler{
client: client,
updater: updater,
}
}
// Reconcile is part of the main kubernetes reconciliation loop which aims to
// move the current state of the cluster closer to the desired state.
//
// The deploymentReconciler is responsible to regenerate ingress objects for respective dogus containing the ces service
// discovery annotation when their state switches between ready <-> not ready.
func (r *deploymentReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
logger := log.FromContext(ctx)
deployment, err := r.getDeployment(ctx, req)
if err != nil {
logger.Info(fmt.Sprintf("failed to get deployment %s: %s", req.NamespacedName, err))
return ctrl.Result{}, client.IgnoreNotFound(err)
}
if !hasDoguLabel(deployment) {
// ignore non dogu deployments
return ctrl.Result{}, nil
}
logger.Info(fmt.Sprintf("Found dogu deployment: [%s]", deployment.Name))
doguService, err := r.getService(ctx, req)
if err != nil {
return ctrl.Result{}, fmt.Errorf("failed to find service for deployment [%s]: %w", deployment.Name, err)
}
err = r.updater.UpsertIngressForService(ctx, doguService)
if err != nil {
return ctrl.Result{}, fmt.Errorf("failed to create/update ingress object of service [%s]: %w", doguService.Name, err)
}
return ctrl.Result{}, nil
}
// SetupWithManager sets up the controller with the Manager.
func (r *deploymentReconciler) SetupWithManager(mgr ctrl.Manager) error {
return ctrl.NewControllerManagedBy(mgr).
For(&v1.Deployment{}).
Complete(r)
}
func (r *deploymentReconciler) getDeployment(ctx context.Context, req ctrl.Request) (*v1.Deployment, error) {
deployment := &v1.Deployment{}
err := r.client.Get(ctx, req.NamespacedName, deployment)
if err != nil {
return nil, fmt.Errorf("failed to get deployment: %w", err)
}
return deployment, nil
}
func hasDoguLabel(deployment client.Object) bool {
for label := range deployment.GetLabels() {
if label == legacyDoguLabel || label == k8sv1.DoguLabelName {
return true
}
}
return false
}
func (r *deploymentReconciler) getService(ctx context.Context, req ctrl.Request) (*corev1.Service, error) {
service := &corev1.Service{}
err := r.client.Get(ctx, req.NamespacedName, service)
if err != nil {
return nil, fmt.Errorf("failed to get service: %w", err)
}
return service, nil
}