| // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| import 'dart:async'; |
| |
| import 'package:async/async.dart'; |
| import 'package:shelf/shelf.dart'; |
| |
| class AsyncHandler { |
| final ResultFuture<Handler> _future; |
| |
| AsyncHandler(Future<Handler> future) : _future = new ResultFuture(future); |
| |
| FutureOr<Response> call(Request request) { |
| if (_future.result == null) { |
| return _future.then((handler) => handler(request)); |
| } |
| |
| if (_future.result.isError) |
| return new Future.error(_future.result.asError.error); |
| |
| return _future.result.asValue.value(request); |
| } |
| } |