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add.go
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add.go
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// Copyright (c) 2020 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 health
import (
"fmt"
"time"
"github.com/spf13/pflag"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/util/workqueue"
"sigs.k8s.io/controller-runtime/pkg/cluster"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/event"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/predicate"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
resourcesv1alpha1 "github.com/gardener/gardener/pkg/apis/resources/v1alpha1"
managerpredicate "github.com/gardener/gardener/pkg/resourcemanager/predicate"
)
// ControllerName is the name of the health controller.
const ControllerName = "health-controller"
// defaultControllerConfig is the default config for the controller.
var defaultControllerConfig ControllerConfig
// ControllerOptions are options for adding the controller to a Manager.
type ControllerOptions struct {
maxConcurrentWorkers int
syncPeriod time.Duration
}
// ControllerConfig is the completed configuration for the controller.
type ControllerConfig struct {
MaxConcurrentWorkers int
SyncPeriod time.Duration
ClassFilter managerpredicate.ClassFilter
TargetCluster cluster.Cluster
}
// AddToManagerWithOptions adds the controller to a Manager with the given config.
func AddToManagerWithOptions(mgr manager.Manager, conf ControllerConfig) error {
healthController, err := controller.New("health-controller", mgr, controller.Options{
MaxConcurrentReconciles: conf.MaxConcurrentWorkers,
Reconciler: &reconciler{
syncPeriod: conf.SyncPeriod,
classFilter: &conf.ClassFilter,
targetClient: conf.TargetCluster.GetClient(),
targetScheme: conf.TargetCluster.GetScheme(),
},
})
if err != nil {
return fmt.Errorf("unable to set up individual controller: %w", err)
}
if err := healthController.Watch(
&source.Kind{Type: &resourcesv1alpha1.ManagedResource{}},
&handler.Funcs{
CreateFunc: func(e event.CreateEvent, q workqueue.RateLimitingInterface) {
q.Add(reconcile.Request{NamespacedName: types.NamespacedName{
Name: e.Object.GetName(),
Namespace: e.Object.GetNamespace(),
}})
},
UpdateFunc: func(e event.UpdateEvent, q workqueue.RateLimitingInterface) {
q.Add(reconcile.Request{NamespacedName: types.NamespacedName{
Name: e.ObjectNew.GetName(),
Namespace: e.ObjectNew.GetNamespace(),
}})
},
},
&conf.ClassFilter, predicate.Or(
managerpredicate.ClassChangedPredicate(),
// start health checks immediately after MR has been reconciled
managerpredicate.ConditionStatusChanged(resourcesv1alpha1.ResourcesApplied, managerpredicate.DefaultConditionChange),
),
); err != nil {
return fmt.Errorf("unable to watch ManagedResources: %w", err)
}
return nil
}
// AddToManager adds the controller to a Manager using the default config.
func AddToManager(mgr manager.Manager) error {
return AddToManagerWithOptions(mgr, defaultControllerConfig)
}
// AddFlags adds the needed command line flags to the given FlagSet.
func (o *ControllerOptions) AddFlags(fs *pflag.FlagSet) {
fs.DurationVar(&o.syncPeriod, "health-sync-period", time.Minute, "duration how often the health of existing resources should be synced")
fs.IntVar(&o.maxConcurrentWorkers, "health-max-concurrent-workers", 10, "number of worker threads for concurrent health reconciliation of resources")
}
// Complete completes the given command line flags and set the defaultControllerConfig accordingly.
func (o *ControllerOptions) Complete() error {
defaultControllerConfig = ControllerConfig{
MaxConcurrentWorkers: o.maxConcurrentWorkers,
SyncPeriod: o.syncPeriod,
}
return nil
}
// Completed returns the completed ControllerConfig.
func (o *ControllerOptions) Completed() *ControllerConfig {
return &defaultControllerConfig
}