rewire aggregation handling chain to be normal

staging/src/k8s.io/apiserver/pkg/server/config.go

@@ -91,6 +91,7 @@ type Config struct {
 	EnableSwaggerUI bool
 	EnableIndex     bool
 	EnableProfiling bool
+	EnableDiscovery bool
 	// Requires generic profiling enabled
 	EnableContentionProfiling bool
 	EnableMetrics             bool
@@ -203,6 +204,7 @@ func NewConfig() *Config {
 		LegacyAPIGroupPrefixes:      sets.NewString(DefaultLegacyAPIPrefix),
 		HealthzChecks:               []healthz.HealthzChecker{healthz.PingHealthz},
 		EnableIndex:                 true,
+		EnableDiscovery:             true,
 		EnableProfiling:             true,
 		MaxRequestsInFlight:         400,
 		MaxMutatingRequestsInFlight: 200,
@@ -345,6 +347,10 @@ func (c *Config) Complete() completedConfig {
 		c.FallThroughHandler = mux.NewPathRecorderMux()
 	}
 
+	if c.FallThroughHandler == nil {
+		c.FallThroughHandler = mux.NewPathRecorderMux()
+	}
+
 	return completedConfig{c}
 }
 
@@ -535,7 +541,10 @@ func installAPI(s *GenericAPIServer, c *Config, delegate http.Handler) {
 		}
 	}
 	routes.Version{Version: c.Version}.Install(s.HandlerContainer)
-	s.HandlerContainer.Add(s.DynamicApisDiscovery())
+
+	if c.EnableDiscovery {
+		s.HandlerContainer.Add(s.DynamicApisDiscovery())
+	}
 }
 
 func NewRequestInfoResolver(c *Config) *apirequest.RequestInfoFactory {

staging/src/k8s.io/apiserver/pkg/server/genericapiserver.go

@@ -189,6 +189,30 @@ func (s *GenericAPIServer) ListedPaths() []string {
 	return s.listedPathProvider.ListedPaths()
 }
 
+var EmptyDelegate = emptyDelegate{
+	requestContextMapper: apirequest.NewRequestContextMapper(),
+}
+
+type emptyDelegate struct {
+	requestContextMapper apirequest.RequestContextMapper
+}
+
+func (s emptyDelegate) UnprotectedHandler() http.Handler {
+	return http.NotFoundHandler()
+}
+func (s emptyDelegate) PostStartHooks() map[string]postStartHookEntry {
+	return map[string]postStartHookEntry{}
+}
+func (s emptyDelegate) HealthzChecks() []healthz.HealthzChecker {
+	return []healthz.HealthzChecker{}
+}
+func (s emptyDelegate) ListedPaths() []string {
+	return []string{}
+}
+func (s emptyDelegate) RequestContextMapper() apirequest.RequestContextMapper {
+	return s.requestContextMapper
+}
+
 func init() {
 	// Send correct mime type for .svg files.
 	// TODO: remove when https://github.com/golang/go/commit/21e47d831bafb59f22b1ea8098f709677ec8ce33

staging/src/k8s.io/kube-aggregator/pkg/cmd/server/start.go

@@ -159,7 +159,7 @@ func (o AggregatorOptions) RunAggregator(stopCh <-chan struct{}) error {
 		return err
 	}
 
-	server, err := config.Complete().New(stopCh)
+	server, err := config.Complete().NewWithDelegate(genericapiserver.EmptyDelegate, stopCh)
 	if err != nil {
 		return err
 	}

vendor/BUILD

@@ -15496,13 +15496,11 @@ go_library(
         "//vendor:k8s.io/apimachinery/pkg/util/runtime",
         "//vendor:k8s.io/apimachinery/pkg/util/sets",
         "//vendor:k8s.io/apimachinery/pkg/util/wait",
-        "//vendor:k8s.io/apiserver/pkg/endpoints/filters",
         "//vendor:k8s.io/apiserver/pkg/endpoints/handlers/responsewriters",
         "//vendor:k8s.io/apiserver/pkg/endpoints/request",
         "//vendor:k8s.io/apiserver/pkg/registry/generic/rest",
         "//vendor:k8s.io/apiserver/pkg/registry/rest",
         "//vendor:k8s.io/apiserver/pkg/server",
-        "//vendor:k8s.io/apiserver/pkg/server/filters",
         "//vendor:k8s.io/client-go/informers",
         "//vendor:k8s.io/client-go/kubernetes",
         "//vendor:k8s.io/client-go/listers/core/v1",