Add GetServiceInfo to xds.GRPCServer (#4507)

xds/server.go

@@ -64,6 +64,7 @@ type grpcServer interface {
 	Serve(net.Listener) error
 	Stop()
 	GracefulStop()
+	GetServiceInfo() map[string]grpc.ServiceInfo
 }
 
 // GRPCServer wraps a gRPC server and provides server-side xDS functionality, by
@@ -136,6 +137,12 @@ func (s *GRPCServer) RegisterService(sd *grpc.ServiceDesc, ss interface{}) {
 	s.gs.RegisterService(sd, ss)
 }
 
+// GetServiceInfo returns a map from service names to ServiceInfo.
+// Service names include the package names, in the form of <package>.<service>.
+func (s *GRPCServer) GetServiceInfo() map[string]grpc.ServiceInfo {
+	return s.gs.GetServiceInfo()
+}
+
 // initXDSClient creates a new xdsClient if there is no existing one available.
 func (s *GRPCServer) initXDSClient() error {
 	s.clientMu.Lock()

xds/server_test.go

@@ -86,6 +86,10 @@ func (f *fakeGRPCServer) GracefulStop() {
 	f.gracefulStopCh.Send(nil)
 }
 
+func (f *fakeGRPCServer) GetServiceInfo() map[string]grpc.ServiceInfo {
+	panic("implement me")
+}
+
 func newFakeGRPCServer() *fakeGRPCServer {
 	return &fakeGRPCServer{
 		done:              make(chan struct{}),