Move CRD informer list generation to k8s

This is in preparation for adding in filtering by discovered CRD types.

Updates #2219

Signed-off-by: Nick Young <ynick@vmware.com>

cmd/contour/serve.go

@@ -22,12 +22,6 @@ import (
 	"syscall"
 	"time"
 
-	projectcontour "github.com/projectcontour/contour/apis/projectcontour/v1"
-
-	ingressroutev1 "github.com/projectcontour/contour/apis/contour/v1beta1"
-
-	serviceapis "sigs.k8s.io/service-apis/api/v1alpha1"
-
 	"github.com/projectcontour/contour/internal/contour"
 	"github.com/projectcontour/contour/internal/dag"
 	"github.com/projectcontour/contour/internal/debug"
@@ -206,30 +200,25 @@ func doServe(log logrus.FieldLogger, ctx *serveContext) error {
 	// using the SyncList to keep track of what to sync later.
 	var informerSyncList k8s.InformerSyncList
 
-	informerSyncList.Add(dynamicInformerFactory.ForResource(ingressroutev1.IngressRouteGVR).Informer()).AddEventHandler(dynamicHandler)
-	informerSyncList.Add(dynamicInformerFactory.ForResource(ingressroutev1.TLSCertificateDelegationGVR).Informer()).AddEventHandler(dynamicHandler)
-	informerSyncList.Add(dynamicInformerFactory.ForResource(projectcontour.HTTPProxyGVR).Informer()).AddEventHandler(dynamicHandler)
-	informerSyncList.Add(dynamicInformerFactory.ForResource(projectcontour.TLSCertificateDelegationGVR).Informer()).AddEventHandler(dynamicHandler)
+	gvri := k8s.DefaultGVRInformer(dynamicInformerFactory, ctx.UseExperimentalServiceAPITypes)
 
-	informerSyncList.Add(informerFactory.Core().V1().Services().Informer()).AddEventHandler(dynamicHandler)
-	informerSyncList.Add(informerFactory.Networking().V1beta1().Ingresses().Informer()).AddEventHandler(dynamicHandler)
+	// TODO(youngnick): Add in filtering the gvri map by enabled apiserver types (#2219) using the discovery library.
 
-	if ctx.UseExperimentalServiceAPITypes {
-		log.Info("Enabling Experimental Service APIs types")
-		informerSyncList.Add(dynamicInformerFactory.ForResource(serviceapis.GroupVersion.WithResource("gatewayclasses")).Informer()).AddEventHandler(dynamicHandler)
-		informerSyncList.Add(dynamicInformerFactory.ForResource(serviceapis.GroupVersion.WithResource("gateways")).Informer()).AddEventHandler(dynamicHandler)
-		informerSyncList.Add(dynamicInformerFactory.ForResource(serviceapis.GroupVersion.WithResource("httproutes")).Informer()).AddEventHandler(dynamicHandler)
-		informerSyncList.Add(dynamicInformerFactory.ForResource(serviceapis.GroupVersion.WithResource("tcproutes")).Informer()).AddEventHandler(dynamicHandler)
+	for _, inf := range gvri.Informers {
+		informerSyncList.RegisterInformer(inf, dynamicHandler)
 	}
 
+	informerSyncList.RegisterInformer(informerFactory.Core().V1().Services().Informer(), dynamicHandler)
+	informerSyncList.RegisterInformer(informerFactory.Networking().V1beta1().Ingresses().Informer(), dynamicHandler)
+
 	// Add informers for each root-ingressroute namespaces
 	for _, factory := range namespacedInformerFactories {
-		informerSyncList.Add(factory.Core().V1().Secrets().Informer()).AddEventHandler(dynamicHandler)
+		informerSyncList.RegisterInformer(factory.Core().V1().Secrets().Informer(), dynamicHandler)
 	}
 
 	// If root-ingressroutes are not defined, then add the informer for all namespaces
 	if len(namespacedInformerFactories) == 0 {
-		informerSyncList.Add(informerFactory.Core().V1().Secrets().Informer()).AddEventHandler(dynamicHandler)
+		informerSyncList.RegisterInformer(informerFactory.Core().V1().Secrets().Informer(), dynamicHandler)
 	}
 
 	// step 5. endpoints updates are handled directly by the EndpointsTranslator
@@ -238,7 +227,7 @@ func doServe(log logrus.FieldLogger, ctx *serveContext) error {
 		FieldLogger: log.WithField("context", "endpointstranslator"),
 	}
 
-	informerSyncList.Add(informerFactory.Core().V1().Endpoints().Informer()).AddEventHandler(et)
+	informerSyncList.RegisterInformer(informerFactory.Core().V1().Endpoints().Informer(), et)
 
 	// step 6. setup workgroup runner and register informers.
 	var g workgroup.Group

internal/k8s/gvrautodetect.go

@@ -0,0 +1,61 @@
+// Copyright © 2020 VMware
+// 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 k8s
+
+import (
+	projectcontour "github.com/projectcontour/contour/apis/projectcontour/v1"
+
+	ingressroutev1 "github.com/projectcontour/contour/apis/contour/v1beta1"
+
+	serviceapis "sigs.k8s.io/service-apis/api/v1alpha1"
+
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/client-go/dynamic/dynamicinformer"
+	"k8s.io/client-go/tools/cache"
+)
+
+type gvrmap map[schema.GroupVersionResource]cache.SharedIndexInformer
+
+// GVRInformer stores a table of Kubernetes GVR objects to their associated informers.
+type GVRInformer struct {
+	Informers gvrmap
+}
+
+// DefaultGVRInformer creates a new GVRInformer lookup table and populates with the default
+// GVRs that Contour will try to watch.
+func DefaultGVRInformer(inffactory dynamicinformer.DynamicSharedInformerFactory, serviceAPIs bool) GVRInformer {
+
+	defaultGVRs := []schema.GroupVersionResource{
+		ingressroutev1.IngressRouteGVR,
+		ingressroutev1.TLSCertificateDelegationGVR,
+		projectcontour.HTTPProxyGVR,
+		projectcontour.TLSCertificateDelegationGVR,
+	}
+
+	if serviceAPIs {
+		defaultGVRs = append(defaultGVRs, serviceapis.GroupVersion.WithResource("gatewayclasses"))
+		defaultGVRs = append(defaultGVRs, serviceapis.GroupVersion.WithResource("gateways"))
+		defaultGVRs = append(defaultGVRs, serviceapis.GroupVersion.WithResource("httproutes"))
+		defaultGVRs = append(defaultGVRs, serviceapis.GroupVersion.WithResource("tcproutes"))
+	}
+
+	gvri := GVRInformer{
+		Informers: make(gvrmap),
+	}
+
+	for _, gvr := range defaultGVRs {
+		gvri.Informers[gvr] = inffactory.ForResource(gvr).Informer()
+	}
+	return gvri
+}

internal/k8s/syncer.go

@@ -23,11 +23,11 @@ type InformerSyncList struct {
 	syncers []cache.InformerSynced
 }
 
-// Add adds the sync function from an informer to InformerSyncList and returns the informer
-// so that .AddEventHandler() can be called on it.
-func (sl *InformerSyncList) Add(inf cache.SharedIndexInformer) cache.SharedIndexInformer {
+// RegisterInformer adds the sync function from an informer to InformerSyncList and calls the informers
+// AddEventHandler method.
+func (sl *InformerSyncList) RegisterInformer(inf cache.SharedIndexInformer, handler cache.ResourceEventHandler) {
 	sl.syncers = append(sl.syncers, inf.HasSynced)
-	return inf
+	inf.AddEventHandler(handler)
 }
 
 // WaitForSync ensures that all the informers in the InformerSyncList are synced before returning.