controller.go

/*
Copyright 2020 The Kubernetes 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 ingress

import (
	"fmt"

	v1beta1 "k8s.io/api/extensions/v1beta1"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
	"k8s.io/client-go/informers"
	clientset "k8s.io/client-go/kubernetes"
	v1beta1extensions "k8s.io/client-go/kubernetes/typed/extensions/v1beta1"
	listersv1beta1 "k8s.io/client-go/listers/extensions/v1beta1"
	"k8s.io/client-go/tools/cache"

	vcclient "sigs.k8s.io/multi-tenancy/incubator/virtualcluster/pkg/client/clientset/versioned"
	vcinformers "sigs.k8s.io/multi-tenancy/incubator/virtualcluster/pkg/client/informers/externalversions/tenancy/v1alpha1"
	"sigs.k8s.io/multi-tenancy/incubator/virtualcluster/pkg/syncer/apis/config"
	"sigs.k8s.io/multi-tenancy/incubator/virtualcluster/pkg/syncer/conversion"
	"sigs.k8s.io/multi-tenancy/incubator/virtualcluster/pkg/syncer/manager"
	pa "sigs.k8s.io/multi-tenancy/incubator/virtualcluster/pkg/syncer/patrol"
	uw "sigs.k8s.io/multi-tenancy/incubator/virtualcluster/pkg/syncer/uwcontroller"
	mc "sigs.k8s.io/multi-tenancy/incubator/virtualcluster/pkg/util/mccontroller"
	"sigs.k8s.io/multi-tenancy/incubator/virtualcluster/pkg/util/plugin"
)

func init() {
	plugin.SyncerResourceRegister.Register(&plugin.Registration{
		ID: "ingress",
		InitFn: func(ctx *plugin.InitContext) (interface{}, error) {
			return NewIngressController(ctx.Config.(*config.SyncerConfiguration), ctx.Client, ctx.Informer, ctx.VCClient, ctx.VCInformer, manager.ResourceSyncerOptions{})
		},
		Disable: true,
	})
}

type controller struct {
	manager.BaseResourceSyncer
	// super master ingress client
	ingressClient v1beta1extensions.IngressesGetter
	// super master informer/listers/synced functions
	ingressLister listersv1beta1.IngressLister
	ingressSynced cache.InformerSynced
}

func NewIngressController(config *config.SyncerConfiguration,
	client clientset.Interface,
	informer informers.SharedInformerFactory,
	vcClient vcclient.Interface,
	vcInformer vcinformers.VirtualClusterInformer,
	options manager.ResourceSyncerOptions) (manager.ResourceSyncer, error) {
	c := &controller{
		BaseResourceSyncer: manager.BaseResourceSyncer{
			Config: config,
		},
		ingressClient: client.ExtensionsV1beta1(),
	}

	var err error
	c.MultiClusterController, err = mc.NewMCController(&v1beta1.Ingress{}, &v1beta1.IngressList{}, c, mc.WithOptions(options.MCOptions))
	if err != nil {
		return nil, err
	}

	c.ingressLister = informer.Extensions().V1beta1().Ingresses().Lister()
	if options.IsFake {
		c.ingressSynced = func() bool { return true }
	} else {
		c.ingressSynced = informer.Extensions().V1beta1().Ingresses().Informer().HasSynced
	}

	c.UpwardController, err = uw.NewUWController(&v1beta1.Ingress{}, c, uw.WithOptions(options.UWOptions))
	if err != nil {
		return nil, err
	}

	c.Patroller, err = pa.NewPatroller(&v1beta1.Ingress{}, c, pa.WithOptions(options.PatrolOptions))
	if err != nil {
		return nil, err
	}

	informer.Extensions().V1beta1().Ingresses().Informer().AddEventHandler(
		cache.FilteringResourceEventHandler{
			FilterFunc: func(obj interface{}) bool {
				switch t := obj.(type) {
				case *v1beta1.Ingress:
					return true
				case cache.DeletedFinalStateUnknown:
					if _, ok := t.Obj.(*v1beta1.Ingress); ok {
						return true
					}
					utilruntime.HandleError(fmt.Errorf("unable to convert object %v to *v1beta1.Ingress", obj))
					return false
				default:
					utilruntime.HandleError(fmt.Errorf("unable to handle object in super master ingress controller: %v", obj))
					return false
				}
			},
			Handler: cache.ResourceEventHandlerFuncs{
				AddFunc: c.enqueueIngress,
				UpdateFunc: func(oldObj, newObj interface{}) {
					newIngress := newObj.(*v1beta1.Ingress)
					oldIngress := oldObj.(*v1beta1.Ingress)
					if newIngress.ResourceVersion != oldIngress.ResourceVersion {
						c.enqueueIngress(newObj)
					}
				},
				DeleteFunc: c.enqueueIngress,
			},
		})
	return c, nil
}

func (c *controller) enqueueIngress(obj interface{}) {
	svc, ok := obj.(*v1beta1.Ingress)
	if !ok {
		return
	}

	clusterName, _ := conversion.GetVirtualOwner(svc)
	if clusterName == "" {
		return
	}

	key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
	if err != nil {
		utilruntime.HandleError(fmt.Errorf("couldn't get key for object %v: %v", obj, err))
		return
	}
	c.UpwardController.AddToQueue(key)
}