add manager configmap controller

Signed-off-by: myan <[email protected]>

manager/cmd/main.go

@@ -202,6 +202,11 @@ func createManager(ctx context.Context,
 		return nil, fmt.Errorf("failed to create a new manager: %w", err)
 	}
 
+	// add the configmap: logLevel
+	if err = controllers.AddConfigMapController(mgr); err != nil {
+		return nil, fmt.Errorf("failed to add configmap controller to manager: %w", err)
+	}
+
 	err = controller.NewTransportCtrl(managerConfig.ManagerNamespace, constants.GHTransportConfigSecret,
 		transportCallback(mgr, managerConfig),
 		managerConfig.TransportConfig,

manager/pkg/controllers/configmap_controller.go

@@ -0,0 +1,72 @@
+/*
+Copyright 2024.
+
+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"
+	"fmt"
+	"time"
+
+	corev1 "k8s.io/api/core/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/predicate"
+
+	"github.com/stolostron/multicluster-global-hub/pkg/constants"
+	"github.com/stolostron/multicluster-global-hub/pkg/logger"
+)
+
+const (
+	RequeueDuration = 5 * time.Second
+	LogLevelKey     = "logLevel"
+)
+
+type managerConfigMapController struct {
+	client client.Client
+}
+
+func AddConfigMapController(mgr ctrl.Manager) error {
+	configmapCtrl := &managerConfigMapController{
+		client: mgr.GetClient(),
+	}
+	configMapPredicate := predicate.NewPredicateFuncs(func(object client.Object) bool {
+		return object.GetName() == constants.GHConfigCMName
+	})
+	return ctrl.NewControllerManagedBy(mgr).
+		For(&corev1.ConfigMap{}).
+		WithEventFilter(configMapPredicate).
+		Complete(configmapCtrl)
+}
+
+func (c *managerConfigMapController) Reconcile(ctx context.Context, request ctrl.Request) (ctrl.Result, error) {
+	log := logger.DefaultZapLogger()
+
+	configMap := &corev1.ConfigMap{}
+	if err := c.client.Get(ctx, request.NamespacedName, configMap); apierrors.IsNotFound(err) {
+		return ctrl.Result{}, nil
+	} else if err != nil {
+		return ctrl.Result{Requeue: true, RequeueAfter: RequeueDuration}, fmt.Errorf("failed to get configmap: %w", err)
+	}
+
+	logLevel := configMap.Data[string(LogLevelKey)]
+	if logLevel != "" {
+		log.Infof("set the log level to: %s", logLevel)
+		logger.SetLogLevel(logger.LogLevel(logLevel))
+	}
+	return ctrl.Result{}, nil
+}

pkg/constants/constants.go

@@ -14,6 +14,10 @@ const (
 	InventoryDeploymentName = "inventory-api"
 	InventoryRouteName      = "inventory-api"
 
+	// GHConfigCMName is the name of configmap that stores important global hub settings
+	// eg. logLevel for both operator and manager.
+	GHConfigCMName = "multicluster-global-hub-config"
+
 	// GHAgentConfigCMName is the name of configmap that stores important global hub settings
 	// eg. aggregationLevel and enableLocalPolicy.
 	GHAgentConfigCMName = "multicluster-global-hub-agent-config"