controller.go

/*
Copyright 2021 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.
*/

// Code generated by injection-gen. DO NOT EDIT.

package parallel

import (
	context "context"
	fmt "fmt"
	reflect "reflect"
	strings "strings"

	zap "go.uber.org/zap"
	corev1 "k8s.io/api/core/v1"
	labels "k8s.io/apimachinery/pkg/labels"
	types "k8s.io/apimachinery/pkg/types"
	watch "k8s.io/apimachinery/pkg/watch"
	scheme "k8s.io/client-go/kubernetes/scheme"
	v1 "k8s.io/client-go/kubernetes/typed/core/v1"
	record "k8s.io/client-go/tools/record"
	versionedscheme "knative.dev/eventing/pkg/client/clientset/versioned/scheme"
	client "knative.dev/eventing/pkg/client/injection/client"
	parallel "knative.dev/eventing/pkg/client/injection/informers/flows/v1/parallel"
	kubeclient "knative.dev/pkg/client/injection/kube/client"
	controller "knative.dev/pkg/controller"
	logging "knative.dev/pkg/logging"
	logkey "knative.dev/pkg/logging/logkey"
	reconciler "knative.dev/pkg/reconciler"
)

const (
	defaultControllerAgentName = "parallel-controller"
	defaultFinalizerName       = "parallels.flows.knative.dev"
)

// NewImpl returns a controller.Impl that handles queuing and feeding work from
// the queue through an implementation of controller.Reconciler, delegating to
// the provided Interface and optional Finalizer methods. OptionsFn is used to return
// controller.ControllerOptions to be used by the internal reconciler.
func NewImpl(ctx context.Context, r Interface, optionsFns ...controller.OptionsFn) *controller.Impl {
	logger := logging.FromContext(ctx)

	// Check the options function input. It should be 0 or 1.
	if len(optionsFns) > 1 {
		logger.Fatal("Up to one options function is supported, found: ", len(optionsFns))
	}

	parallelInformer := parallel.Get(ctx)

	lister := parallelInformer.Lister()

	var promoteFilterFunc func(obj interface{}) bool

	rec := &reconcilerImpl{
		LeaderAwareFuncs: reconciler.LeaderAwareFuncs{
			PromoteFunc: func(bkt reconciler.Bucket, enq func(reconciler.Bucket, types.NamespacedName)) error {
				all, err := lister.List(labels.Everything())
				if err != nil {
					return err
				}
				for _, elt := range all {
					if promoteFilterFunc != nil {
						if ok := promoteFilterFunc(elt); !ok {
							continue
						}
					}
					enq(bkt, types.NamespacedName{
						Namespace: elt.GetNamespace(),
						Name:      elt.GetName(),
					})
				}
				return nil
			},
		},
		Client:        client.Get(ctx),
		Lister:        lister,
		reconciler:    r,
		finalizerName: defaultFinalizerName,
	}

	ctrType := reflect.TypeOf(r).Elem()
	ctrTypeName := fmt.Sprintf("%s.%s", ctrType.PkgPath(), ctrType.Name())
	ctrTypeName = strings.ReplaceAll(ctrTypeName, "/", ".")

	logger = logger.With(
		zap.String(logkey.ControllerType, ctrTypeName),
		zap.String(logkey.Kind, "flows.knative.dev.Parallel"),
	)

	impl := controller.NewContext(ctx, rec, controller.ControllerOptions{WorkQueueName: ctrTypeName, Logger: logger})
	agentName := defaultControllerAgentName

	// Pass impl to the options. Save any optional results.
	for _, fn := range optionsFns {
		opts := fn(impl)
		if opts.ConfigStore != nil {
			rec.configStore = opts.ConfigStore
		}
		if opts.FinalizerName != "" {
			rec.finalizerName = opts.FinalizerName
		}
		if opts.AgentName != "" {
			agentName = opts.AgentName
		}
		if opts.SkipStatusUpdates {
			rec.skipStatusUpdates = true
		}
		if opts.DemoteFunc != nil {
			rec.DemoteFunc = opts.DemoteFunc
		}
		if opts.PromoteFilterFunc != nil {
			promoteFilterFunc = opts.PromoteFilterFunc
		}
	}

	rec.Recorder = createRecorder(ctx, agentName)

	return impl
}

func createRecorder(ctx context.Context, agentName string) record.EventRecorder {
	logger := logging.FromContext(ctx)

	recorder := controller.GetEventRecorder(ctx)
	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(
				&v1.EventSinkImpl{Interface: kubeclient.Get(ctx).CoreV1().Events("")}),
		}
		recorder = eventBroadcaster.NewRecorder(scheme.Scheme, corev1.EventSource{Component: agentName})
		go func() {
			<-ctx.Done()
			for _, w := range watches {
				w.Stop()
			}
		}()
	}

	return recorder
}

func init() {
	versionedscheme.AddToScheme(scheme.Scheme)
}