function getServer() {
  var server = new grpc.Server();
  server.addService(echo.EchoService.service, {
    echo: doEcho,
    echoAbort: doEchoAbort,
    serverStreamingEcho: doServerStreamingEcho,
  });
  return server;
}
Get a new server with the handler functions in this file bound to the
methods it serves.
@return {!Server} The new server object