tests/standalone/io/raw_secure_socket_pause_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";
import "dart:isolate";

Future<HttpServer> startServer() {
  return HttpServer.bindSecure(
      "localhost",
      0,
      backlog: 5,
      certificateName: 'localhost_cert').then((server) {
    server.listen((HttpRequest request) {
      request.listen(
        (_) { },
        onDone: () {
          request.response.contentLength = 100;
          for (int i = 0; i < 10; i++) {
            request.response.add([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
          }
          request.response.close();
        });
    });
    return server;
  });
}

void InitializeSSL() {
  var testPkcertDatabase =
      new Path(new Options().script).directoryPath.append('pkcert/');
  SecureSocket.initialize(database: testPkcertDatabase.toNativePath(),
                          password: 'dartdart');
}

void main() {
  List<int> message = "GET / HTTP/1.0\r\nHost: localhost\r\n\r\n".codeUnits;
  int written = 0;
  List<int> body = <int>[];
  InitializeSSL();
  startServer().then((server) {
    RawSecureSocket.connect("localhost", server.port).then((socket) {
      StreamSubscription subscription;
      bool paused = false;
      bool readEventsTested = false;
      bool readEventsPaused = false;

      void runPauseTest() {
        subscription.pause();
        paused = true;
        new Timer(const Duration(milliseconds: 500), () {
            paused = false;
            subscription.resume();
        });
      }

      void runReadEventTest() {
        if (readEventsTested) return;
        readEventsTested = true;
        socket.readEventsEnabled = false;
        readEventsPaused = true;
        new Timer(const Duration(milliseconds: 500), () {
            readEventsPaused = false;
            socket.readEventsEnabled = true;
        });
      }

      subscription = socket.listen(
          (RawSocketEvent event) {
            Expect.isFalse(paused);
            switch (event) {
              case RawSocketEvent.READ:
                Expect.isFalse(readEventsPaused);
                runReadEventTest();
                body.addAll(socket.read());
                break;
              case RawSocketEvent.WRITE:
                written +=
                    socket.write(message, written, message.length - written);
                if (written < message.length) {
                  socket.writeEventsEnabled = true;
                } else {
                  socket.shutdown(SocketDirection.SEND);
                  runPauseTest();
                }
                break;
              case RawSocketEvent.READ_CLOSED:
                Expect.isTrue(body.length > 100);
                Expect.equals(72, body[0]);
                Expect.equals(9, body[body.length - 1]);
                server.close();
                break;
              default: throw "Unexpected event $event";
            }
          },
          onError: (e) {
            String msg = "onError handler of RawSecureSocket stream hit: $e";
            var trace = getAttachedStackTrace(e);
            if (trace != null) msg += "\nStackTrace: $trace";
            Expect.fail(msg);
          });
    });
  });
}