controlWebServer method Null safety

Future<ServiceProtocolInfo> controlWebServer (
  1. {bool enable: false,
  2. bool? silenceOutput}
)

Control the web server that the service protocol is accessed through. enable is used as a toggle to enable or disable the web server servicing requests. If silenceOutput is provided and is true, the server will not output information to the console.

Implementation

static Future<ServiceProtocolInfo> controlWebServer(
    {bool enable = false, bool? silenceOutput}) async {
  // TODO: When NNBD is complete, delete the following line.
  ArgumentError.checkNotNull(enable, 'enable');
  // Port to receive response from service isolate.
  final RawReceivePort receivePort = new RawReceivePort();
  final Completer<Uri> uriCompleter = new Completer<Uri>();
  receivePort.handler = (Uri uri) => uriCompleter.complete(uri);
  // Request the information from the service isolate.
  _webServerControl(receivePort.sendPort, enable, silenceOutput);
  // Await the response from the service isolate.
  Uri uri = await uriCompleter.future;
  // Close the port.
  receivePort.close();
  return new ServiceProtocolInfo(uri);
}