feat: implement knative support

Knative Ingress resources are now processed and satisfied.
Plugins on Knative services are also supported via the regular
annotations.

cli/ingress-controller/main.go

@@ -55,6 +55,8 @@ import (
 	"k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/cache"
 	"k8s.io/client-go/tools/clientcmd"
+	knativeclient "knative.dev/serving/pkg/client/clientset/versioned"
+	knativeinformer "knative.dev/serving/pkg/client/informers/externalversions"
 )
 
 func controllerConfigFromCLIConfig(cliConfig cliConfig) controller.Configuration {
@@ -240,6 +242,23 @@ func main() {
 		configurationinformer.WithNamespace(cliConfig.WatchNamespace),
 	)
 
+	knativeClient, _ := knativeclient.NewForConfig(kubeCfg)
+
+	var knativeInformerFactory knativeinformer.SharedInformerFactory
+	err = discovery.ServerSupportsVersion(knativeClient.Discovery(), schema.GroupVersion{
+		Group:   "networking.internal.knative.dev",
+		Version: "v1alpha1",
+	})
+	if err == nil {
+		controllerConfig.EnableKnativeIngressSupport = true
+		controllerConfig.KnativeClient = knativeClient
+		knativeInformerFactory = knativeinformer.NewSharedInformerFactoryWithOptions(
+			knativeClient,
+			cliConfig.SyncPeriod,
+			knativeinformer.WithNamespace(cliConfig.WatchNamespace),
+		)
+	}
+
 	var synced []cache.InformerSynced
 	updateChannel := channels.NewRingChannel(1024)
 	reh := controller.ResourceEventHandler{
@@ -307,6 +326,13 @@ func main() {
 	cacheStores.Credential = kongCredentialInformer.GetStore()
 	informers = append(informers, kongCredentialInformer)
 
+	if controllerConfig.EnableKnativeIngressSupport {
+		knativeIngressInformer := knativeInformerFactory.Networking().V1alpha1().Ingresses().Informer()
+		knativeIngressInformer.AddEventHandler(reh)
+		cacheStores.KnativeIngress = knativeIngressInformer.GetStore()
+		informers = append(informers, knativeIngressInformer)
+	}
+
 	stopCh := make(chan struct{})
 	for _, informer := range informers {
 		go informer.Run(stopCh)
@@ -316,10 +342,7 @@ func main() {
 		runtime.HandleError(fmt.Errorf("Timed out waiting for caches to sync"))
 	}
 
-	store := store.New(
-		cacheStores,
-		annotations.IngressClassValidatorFuncFromObjectMeta(controllerConfig.IngressClass),
-	)
+	store := store.New(cacheStores, cliConfig.IngressClass)
 	kong, err := controller.NewKongController(&controllerConfig, updateChannel,
 		store)
 	if err != nil {

cli/ingress-controller/main_test.go

@@ -24,7 +24,6 @@ import (
 	"time"
 
 	"github.com/eapache/channels"
-	"github.com/kong/kubernetes-ingress-controller/internal/ingress/annotations"
 	"github.com/kong/kubernetes-ingress-controller/internal/ingress/controller"
 	"github.com/kong/kubernetes-ingress-controller/internal/ingress/store"
 )
@@ -77,10 +76,7 @@ func TestHandleSigterm(t *testing.T) {
 		KubeClient: kubeClient,
 	},
 		channels.NewRingChannel(1024),
-		store.New(
-			store.CacheStores{},
-			annotations.IngressClassValidatorFuncFromObjectMeta(conf.IngressClass),
-		),
+		store.New(store.CacheStores{}, conf.IngressClass),
 	)
 
 	go handleSigterm(kong, make(chan struct{}), func(code int) {

go.mod

@@ -3,38 +3,34 @@ module github.com/kong/kubernetes-ingress-controller
 go 1.13
 
 require (
-	cloud.google.com/go v0.40.0 // indirect
-	github.com/blang/semver v0.0.0-20190414102917-ba2c2ddd8906
+	contrib.go.opencensus.io/exporter/ocagent v0.6.0 // indirect
+	contrib.go.opencensus.io/exporter/prometheus v0.1.0 // indirect
+	contrib.go.opencensus.io/exporter/stackdriver v0.12.9 // indirect
+	github.com/blang/semver v3.5.0+incompatible
 	github.com/eapache/channels v1.1.0
-	github.com/eapache/queue v1.1.0 // indirect
-	github.com/evanphx/json-patch v4.1.0+incompatible // indirect
 	github.com/fatih/color v1.7.0
-	github.com/gogo/protobuf v1.2.1 // indirect
 	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
-	github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef // indirect
-	github.com/googleapis/gnostic v0.1.0 // indirect
+	github.com/google/go-containerregistry v0.0.0-20200131185320-aec8da010de2 // indirect
 	github.com/hashicorp/go-uuid v1.0.1
 	github.com/hbagdi/deck v0.7.1-0.20191223190449-3d9f90945d9d
 	github.com/hbagdi/go-kong v0.10.0
+	github.com/mattbaird/jsonpatch v0.0.0-20171005235357-81af80346b1a // indirect
 	github.com/mattn/go-colorable v0.1.2 // indirect
 	github.com/mitchellh/mapstructure v1.1.2
-	github.com/onsi/ginkgo v1.8.0 // indirect
-	github.com/onsi/gomega v1.5.0 // indirect
+	github.com/openzipkin/zipkin-go v0.2.2 // indirect
 	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v0.9.4
-	github.com/spf13/pflag v1.0.3
-	github.com/spf13/viper v1.2.1
+	github.com/prometheus/client_golang v1.0.0
+	github.com/spf13/pflag v1.0.5
+	github.com/spf13/viper v1.3.2
 	github.com/stretchr/testify v1.4.0
 	github.com/tidwall/gjson v1.2.1
 	github.com/tidwall/match v1.0.1 // indirect
 	github.com/tidwall/pretty v0.0.0-20190325153808-1166b9ac2b65 // indirect
-	golang.org/x/sys v0.0.0-20190610200419-93c9922d18ae // indirect
-	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
-	google.golang.org/appengine v1.6.1 // indirect
 	gopkg.in/go-playground/assert.v1 v1.2.1 // indirect
 	gopkg.in/go-playground/pool.v3 v3.1.1
-	k8s.io/api v0.0.0-20190819141258-3544db3b9e44
-	k8s.io/apimachinery v0.0.0-20190817020851-f2f3a405f61d
-	k8s.io/client-go v0.0.0-20190819141724-e14f31a72a77
-	k8s.io/utils v0.0.0-20190308190857-21c4ce38f2a7 // indirect
+	k8s.io/api v0.17.0
+	k8s.io/apimachinery v0.17.0
+	k8s.io/client-go v0.17.0
+	knative.dev/pkg v0.0.0-20200205160431-4ec5e09f716b // indirect
+	knative.dev/serving v0.12.1
 )