sdk/tests/standalone/io/web_socket_pipe_test.dart

// Copyright (c) 2013, 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.
//
// VMOptions=
// VMOptions=--short_socket_read
// VMOptions=--short_socket_write
// VMOptions=--short_socket_read --short_socket_write

import "package:expect/expect.dart";
import "dart:async";
import "dart:io";

createReverseStringTransformer() {
  return new StreamTransformer.fromHandlers(
      handleData: (String data, sink) {
        var sb = new StringBuffer();
        for (int i = data.length - 1; i >= 0; i--) sb.write(data[i]);
        sink.add(sb.toString());
      });
}

testPipe({int messages, bool transform}) {
  HttpServer.bind("127.0.0.1", 0).then((server) {
    server.listen((request) {
      WebSocketTransformer.upgrade(request).then((websocket) {
        (transform ? websocket.transform(createReverseStringTransformer())
                   : websocket)
            .pipe(websocket)
            .then((_) => server.close());
      });
    });
    WebSocket.connect("ws://127.0.0.1:${server.port}/").then((client) {
      var count = 0;
      next() {
        if (count < messages) {
          client.add("Hello");
        } else {
          client.close();
        }
      }

      next();
      client.listen(
          (data) {
            count++;
            if (transform) {
              Expect.equals("olleH", data);
            } else {
              Expect.equals("Hello", data);
            }
            next();
          },
          onDone: () => print("Client received close"));
    });
  });
}

void main() {
  testPipe(messages: 0, transform: false);
  testPipe(messages: 0, transform: true);
  testPipe(messages: 1, transform: false);
  testPipe(messages: 1, transform: true);
  testPipe(messages: 10, transform: false);
  testPipe(messages: 10, transform: true);
}