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/
reconciler.go
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/
reconciler.go
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/*
Copyright 2019 The Knative Authors
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 reconciler
import (
"time"
clientset "github.com/knative/eventing/contrib/natss/pkg/client/clientset/versioned"
natssScheme "github.com/knative/eventing/contrib/natss/pkg/client/clientset/versioned/scheme"
"github.com/knative/pkg/configmap"
"github.com/knative/pkg/logging/logkey"
"github.com/knative/pkg/system"
"go.uber.org/zap"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/record"
)
// Options defines the common reconciler options.
// We define this to reduce the boilerplate argument list when
// creating our controllers.
type Options struct {
KubeClientSet kubernetes.Interface
DynamicClientSet dynamic.Interface
NatssClientSet clientset.Interface
Recorder record.EventRecorder
StatsReporter StatsReporter
ConfigMapWatcher *configmap.InformedWatcher
Logger *zap.SugaredLogger
ResyncPeriod time.Duration
StopChannel <-chan struct{}
}
// This is mutable for testing.
var resetPeriod = 30 * time.Second
func NewOptionsOrDie(cfg *rest.Config, logger *zap.SugaredLogger, stopCh <-chan struct{}) Options {
kubeClient := kubernetes.NewForConfigOrDie(cfg)
dynamicClient := dynamic.NewForConfigOrDie(cfg)
natssClient := clientset.NewForConfigOrDie(cfg)
configMapWatcher := configmap.NewInformedWatcher(kubeClient, system.Namespace())
return Options{
KubeClientSet: kubeClient,
DynamicClientSet: dynamicClient,
ConfigMapWatcher: configMapWatcher,
NatssClientSet: natssClient,
Logger: logger,
ResyncPeriod: 10 * time.Hour, // Based on controller-runtime default.
StopChannel: stopCh,
}
}
// GetTrackerLease returns a multiple of the resync period to use as the
// duration for tracker leases. This attempts to ensure that resyncs happen to
// refresh leases frequently enough that we don't miss updates to tracked
// objects.
func (o Options) GetTrackerLease() time.Duration {
return o.ResyncPeriod * 3
}
// Base implements the core controller logic, given a Reconciler.
type Base struct {
// KubeClientSet allows us to talk to the k8s for core APIs
KubeClientSet kubernetes.Interface
// DynamicClientSet allows us to configure pluggable Build objects
DynamicClientSet dynamic.Interface
NatssClientSet clientset.Interface
// ConfigMapWatcher allows us to watch for ConfigMap changes.
ConfigMapWatcher configmap.Watcher
// Recorder is an event recorder for recording Event resources to the
// Kubernetes API.
Recorder record.EventRecorder
// StatsReporter reports reconciler's metrics.
StatsReporter StatsReporter
// Sugared logger is easier to use but is not as performant as the
// raw logger. In performance critical paths, call logger.Desugar()
// and use the returned raw logger instead. In addition to the
// performance benefits, raw logger also preserves type-safety at
// the expense of slightly greater verbosity.
Logger *zap.SugaredLogger
}
// NewBase instantiates a new instance of Base implementing
// the common & boilerplate code between our reconcilers.
func NewBase(opt Options, controllerAgentName string) *Base {
// Enrich the logs with controller name
logger := opt.Logger.Named(controllerAgentName).With(zap.String(logkey.ControllerType, controllerAgentName))
recorder := opt.Recorder
if recorder == nil {
// Create event broadcaster
logger.Debug("Creating event broadcaster")
eventBroadcaster := record.NewBroadcaster()
watches := []watch.Interface{
eventBroadcaster.StartLogging(logger.Named("event-broadcaster").Infof),
eventBroadcaster.StartRecordingToSink(
&typedcorev1.EventSinkImpl{Interface: opt.KubeClientSet.CoreV1().Events("")}),
}
recorder = eventBroadcaster.NewRecorder(
scheme.Scheme, corev1.EventSource{Component: controllerAgentName})
go func() {
<-opt.StopChannel
for _, w := range watches {
w.Stop()
}
}()
}
statsReporter := opt.StatsReporter
if statsReporter == nil {
logger.Debug("Creating stats reporter")
var err error
statsReporter, err = NewStatsReporter(controllerAgentName)
if err != nil {
logger.Fatal(err)
}
}
base := &Base{
KubeClientSet: opt.KubeClientSet,
DynamicClientSet: opt.DynamicClientSet,
NatssClientSet: opt.NatssClientSet,
ConfigMapWatcher: opt.ConfigMapWatcher,
Recorder: recorder,
StatsReporter: statsReporter,
Logger: logger,
}
return base
}
func init() {
// Add run types to the default Kubernetes Scheme so Events can be
// logged for run types.
_ = natssScheme.AddToScheme(scheme.Scheme)
}