remoting/host/desktop_session_agent.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "remoting/host/desktop_session_agent.h"
   6
   7 #include "base/files/file_util.h"
   8 #include "base/logging.h"
   9 #include "base/memory/shared_memory.h"
  10 #include "ipc/ipc_channel_proxy.h"
  11 #include "ipc/ipc_message.h"
  12 #include "ipc/ipc_message_macros.h"
  13 #include "remoting/base/auto_thread_task_runner.h"
  14 #include "remoting/base/constants.h"
  15 #include "remoting/host/audio_capturer.h"
  16 #include "remoting/host/chromoting_messages.h"
  17 #include "remoting/host/desktop_environment.h"
  18 #include "remoting/host/input_injector.h"
  19 #include "remoting/host/ipc_util.h"
  20 #include "remoting/host/remote_input_filter.h"
  21 #include "remoting/host/screen_controls.h"
  22 #include "remoting/host/screen_resolution.h"
  23 #include "remoting/proto/audio.pb.h"
  24 #include "remoting/proto/control.pb.h"
  25 #include "remoting/proto/event.pb.h"
  26 #include "remoting/protocol/clipboard_stub.h"
  27 #include "remoting/protocol/input_event_tracker.h"
  28 #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
  29 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
  30 #include "third_party/webrtc/modules/desktop_capture/mouse_cursor.h"
  31 #include "third_party/webrtc/modules/desktop_capture/shared_memory.h"
  32
  33 namespace remoting {
  34
  35 namespace {
  36
  37 // Routes local clipboard events though the IPC channel to the network process.
  38 class DesktopSesssionClipboardStub : public protocol::ClipboardStub {
  39  public:
  40   explicit DesktopSesssionClipboardStub(
  41       scoped_refptr<DesktopSessionAgent> desktop_session_agent);
  42   ~DesktopSesssionClipboardStub() override;
  43
  44   // protocol::ClipboardStub implementation.
  45   void InjectClipboardEvent(const protocol::ClipboardEvent& event) override;
  46
  47  private:
  48   scoped_refptr<DesktopSessionAgent> desktop_session_agent_;
  49
  50   DISALLOW_COPY_AND_ASSIGN(DesktopSesssionClipboardStub);
  51 };
  52
  53 DesktopSesssionClipboardStub::DesktopSesssionClipboardStub(
  54     scoped_refptr<DesktopSessionAgent> desktop_session_agent)
  55     : desktop_session_agent_(desktop_session_agent) {
  56 }
  57
  58 DesktopSesssionClipboardStub::~DesktopSesssionClipboardStub() {
  59 }
  60
  61 void DesktopSesssionClipboardStub::InjectClipboardEvent(
  62     const protocol::ClipboardEvent& event) {
  63   desktop_session_agent_->InjectClipboardEvent(event);
  64 }
  65
  66 }  // namespace
  67
  68 // webrtc::SharedMemory implementation that notifies creating
  69 // DesktopSessionAgent when it's deleted.
  70 class DesktopSessionAgent::SharedBuffer : public webrtc::SharedMemory {
  71  public:
  72   static scoped_ptr<SharedBuffer> Create(DesktopSessionAgent* agent,
  73                                          size_t size,
  74                                          int id) {
  75     scoped_ptr<base::SharedMemory> memory(new base::SharedMemory());
  76     if (!memory->CreateAndMapAnonymous(size))
  77       return nullptr;
  78     return make_scoped_ptr(new SharedBuffer(agent, memory.Pass(), size, id));
  79   }
  80
  81   ~SharedBuffer() override { agent_->OnSharedBufferDeleted(id()); }
  82
  83  private:
  84   SharedBuffer(DesktopSessionAgent* agent,
  85                scoped_ptr<base::SharedMemory> memory,
  86                size_t size,
  87                int id)
  88       : SharedMemory(memory->memory(), size,
  89 #if defined(OS_WIN)
  90                      memory->handle(),
  91 #else
  92                      memory->handle().fd,
  93 #endif
  94                      id),
  95         agent_(agent),
  96         shared_memory_(memory.Pass()) {
  97   }
  98
  99   DesktopSessionAgent* agent_;
 100   scoped_ptr<base::SharedMemory> shared_memory_;
 101
 102   DISALLOW_COPY_AND_ASSIGN(SharedBuffer);
 103 };
 104
 105 DesktopSessionAgent::Delegate::~Delegate() {
 106 }
 107
 108 DesktopSessionAgent::DesktopSessionAgent(
 109     scoped_refptr<AutoThreadTaskRunner> audio_capture_task_runner,
 110     scoped_refptr<AutoThreadTaskRunner> caller_task_runner,
 111     scoped_refptr<AutoThreadTaskRunner> input_task_runner,
 112     scoped_refptr<AutoThreadTaskRunner> io_task_runner,
 113     scoped_refptr<AutoThreadTaskRunner> video_capture_task_runner)
 114     : audio_capture_task_runner_(audio_capture_task_runner),
 115       caller_task_runner_(caller_task_runner),
 116       input_task_runner_(input_task_runner),
 117       io_task_runner_(io_task_runner),
 118       video_capture_task_runner_(video_capture_task_runner),
 119       next_shared_buffer_id_(1),
 120       shared_buffers_(0),
 121       started_(false),
 122       weak_factory_(this) {
 123   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 124 }
 125
 126 bool DesktopSessionAgent::OnMessageReceived(const IPC::Message& message) {
 127   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 128
 129   bool handled = true;
 130   if (started_) {
 131     IPC_BEGIN_MESSAGE_MAP(DesktopSessionAgent, message)
 132       IPC_MESSAGE_HANDLER(ChromotingNetworkDesktopMsg_CaptureFrame,
 133                           OnCaptureFrame)
 134       IPC_MESSAGE_HANDLER(ChromotingNetworkDesktopMsg_InjectClipboardEvent,
 135                           OnInjectClipboardEvent)
 136       IPC_MESSAGE_HANDLER(ChromotingNetworkDesktopMsg_InjectKeyEvent,
 137                           OnInjectKeyEvent)
 138       IPC_MESSAGE_HANDLER(ChromotingNetworkDesktopMsg_InjectTextEvent,
 139                           OnInjectTextEvent)
 140       IPC_MESSAGE_HANDLER(ChromotingNetworkDesktopMsg_InjectMouseEvent,
 141                           OnInjectMouseEvent)
 142       IPC_MESSAGE_HANDLER(ChromotingNetworkDesktopMsg_SetScreenResolution,
 143                           SetScreenResolution)
 144       IPC_MESSAGE_UNHANDLED(handled = false)
 145     IPC_END_MESSAGE_MAP()
 146   } else {
 147     IPC_BEGIN_MESSAGE_MAP(DesktopSessionAgent, message)
 148       IPC_MESSAGE_HANDLER(ChromotingNetworkDesktopMsg_StartSessionAgent,
 149                           OnStartSessionAgent)
 150       IPC_MESSAGE_UNHANDLED(handled = false)
 151     IPC_END_MESSAGE_MAP()
 152   }
 153
 154   CHECK(handled) << "Received unexpected IPC type: " << message.type();
 155   return handled;
 156 }
 157
 158 void DesktopSessionAgent::OnChannelConnected(int32 peer_pid) {
 159   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 160
 161   VLOG(1) << "IPC: desktop <- network (" << peer_pid << ")";
 162
 163   desktop_pipe_.Close();
 164 }
 165
 166 void DesktopSessionAgent::OnChannelError() {
 167   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 168
 169   // Make sure the channel is closed.
 170   network_channel_.reset();
 171   desktop_pipe_.Close();
 172
 173   // Notify the caller that the channel has been disconnected.
 174   if (delegate_.get())
 175     delegate_->OnNetworkProcessDisconnected();
 176 }
 177
 178 webrtc::SharedMemory* DesktopSessionAgent::CreateSharedMemory(size_t size) {
 179   DCHECK(video_capture_task_runner_->BelongsToCurrentThread());
 180
 181   scoped_ptr<SharedBuffer> buffer =
 182       SharedBuffer::Create(this, size, next_shared_buffer_id_);
 183   if (buffer) {
 184     shared_buffers_++;
 185
 186     // |next_shared_buffer_id_| starts from 1 and incrementing it by 2 makes
 187     // sure it is always odd and therefore zero is never used as a valid buffer
 188     // ID.
 189     //
 190     // It is very unlikely (though theoretically possible) to allocate the same
 191     // ID for two different buffers due to integer overflow. It should take
 192     // about a year of allocating 100 new buffers every second. Practically
 193     // speaking it never happens.
 194     next_shared_buffer_id_ += 2;
 195
 196     IPC::PlatformFileForTransit handle;
 197 #if defined(OS_WIN)
 198     handle = buffer->handle();
 199 #else
 200     handle = base::FileDescriptor(buffer->handle(), false);
 201 #endif
 202     SendToNetwork(new ChromotingDesktopNetworkMsg_CreateSharedBuffer(
 203         buffer->id(), handle, buffer->size()));
 204   }
 205
 206   return buffer.release();
 207 }
 208
 209 DesktopSessionAgent::~DesktopSessionAgent() {
 210   DCHECK(!audio_capturer_);
 211   DCHECK(!desktop_environment_);
 212   DCHECK(!network_channel_);
 213   DCHECK(!screen_controls_);
 214   DCHECK(!video_capturer_);
 215 }
 216
 217 const std::string& DesktopSessionAgent::client_jid() const {
 218   return client_jid_;
 219 }
 220
 221 void DesktopSessionAgent::DisconnectSession() {
 222   SendToNetwork(new ChromotingDesktopNetworkMsg_DisconnectSession());
 223 }
 224
 225 void DesktopSessionAgent::OnLocalMouseMoved(
 226     const webrtc::DesktopVector& new_pos) {
 227   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 228
 229   remote_input_filter_->LocalMouseMoved(new_pos);
 230 }
 231
 232 void DesktopSessionAgent::SetDisableInputs(bool disable_inputs) {
 233   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 234
 235   // Do not expect this method to be called because it is only used by It2Me.
 236   NOTREACHED();
 237 }
 238
 239 void DesktopSessionAgent::ResetVideoPipeline() {
 240   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 241
 242   // This method is only used by HostExtensionSessions in the network process.
 243   NOTREACHED();
 244 }
 245
 246 void DesktopSessionAgent::OnStartSessionAgent(
 247     const std::string& authenticated_jid,
 248     const ScreenResolution& resolution,
 249     bool virtual_terminal) {
 250   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 251   DCHECK(!started_);
 252   DCHECK(!audio_capturer_);
 253   DCHECK(!desktop_environment_);
 254   DCHECK(!input_injector_);
 255   DCHECK(!screen_controls_);
 256   DCHECK(!video_capturer_);
 257
 258   started_ = true;
 259   client_jid_ = authenticated_jid;
 260
 261   // Enable the curtain mode.
 262   delegate_->desktop_environment_factory().SetEnableCurtaining(
 263       virtual_terminal);
 264
 265   // Create a desktop environment for the new session.
 266   desktop_environment_ = delegate_->desktop_environment_factory().Create(
 267       weak_factory_.GetWeakPtr());
 268
 269   // Create the session controller and set the initial screen resolution.
 270   screen_controls_ = desktop_environment_->CreateScreenControls();
 271   SetScreenResolution(resolution);
 272
 273   // Create the input injector.
 274   input_injector_ = desktop_environment_->CreateInputInjector();
 275
 276   // Hook up the input filter.
 277   input_tracker_.reset(new protocol::InputEventTracker(input_injector_.get()));
 278   remote_input_filter_.reset(new RemoteInputFilter(input_tracker_.get()));
 279
 280 #if defined(OS_WIN)
 281   // LocalInputMonitorWin filters out an echo of the injected input before it
 282   // reaches |remote_input_filter_|.
 283   remote_input_filter_->SetExpectLocalEcho(false);
 284 #endif  // defined(OS_WIN)
 285
 286   // Start the input injector.
 287   scoped_ptr<protocol::ClipboardStub> clipboard_stub(
 288       new DesktopSesssionClipboardStub(this));
 289   input_injector_->Start(clipboard_stub.Pass());
 290
 291   // Start the audio capturer.
 292   if (delegate_->desktop_environment_factory().SupportsAudioCapture()) {
 293     audio_capturer_ = desktop_environment_->CreateAudioCapturer();
 294     audio_capture_task_runner_->PostTask(
 295         FROM_HERE, base::Bind(&DesktopSessionAgent::StartAudioCapturer, this));
 296   }
 297
 298   // Start the video capturer and mouse cursor monitor.
 299   video_capturer_ = desktop_environment_->CreateVideoCapturer();
 300   mouse_cursor_monitor_ = desktop_environment_->CreateMouseCursorMonitor();
 301   video_capture_task_runner_->PostTask(
 302       FROM_HERE, base::Bind(
 303           &DesktopSessionAgent::StartVideoCapturerAndMouseMonitor, this));
 304 }
 305
 306 void DesktopSessionAgent::OnCaptureCompleted(webrtc::DesktopFrame* frame) {
 307   DCHECK(video_capture_task_runner_->BelongsToCurrentThread());
 308
 309   last_frame_.reset(frame);
 310
 311   current_size_ = frame->size();
 312
 313   // Serialize webrtc::DesktopFrame.
 314   SerializedDesktopFrame serialized_frame;
 315   serialized_frame.shared_buffer_id = frame->shared_memory()->id();
 316   serialized_frame.bytes_per_row = frame->stride();
 317   serialized_frame.dimensions = frame->size();
 318   serialized_frame.capture_time_ms = frame->capture_time_ms();
 319   serialized_frame.dpi = frame->dpi();
 320   for (webrtc::DesktopRegion::Iterator i(frame->updated_region());
 321        !i.IsAtEnd(); i.Advance()) {
 322     serialized_frame.dirty_region.push_back(i.rect());
 323   }
 324
 325   SendToNetwork(
 326       new ChromotingDesktopNetworkMsg_CaptureCompleted(serialized_frame));
 327 }
 328
 329 void DesktopSessionAgent::OnMouseCursor(webrtc::MouseCursor* cursor) {
 330   DCHECK(video_capture_task_runner_->BelongsToCurrentThread());
 331
 332   scoped_ptr<webrtc::MouseCursor> owned_cursor(cursor);
 333
 334   SendToNetwork(
 335       new ChromotingDesktopNetworkMsg_MouseCursor(*owned_cursor));
 336 }
 337
 338 void DesktopSessionAgent::OnMouseCursorPosition(
 339     webrtc::MouseCursorMonitor::CursorState state,
 340     const webrtc::DesktopVector& position) {
 341   // We're not subscribing to mouse position changes.
 342   NOTREACHED();
 343 }
 344
 345 void DesktopSessionAgent::InjectClipboardEvent(
 346     const protocol::ClipboardEvent& event) {
 347   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 348
 349   std::string serialized_event;
 350   if (!event.SerializeToString(&serialized_event)) {
 351     LOG(ERROR) << "Failed to serialize protocol::ClipboardEvent.";
 352     return;
 353   }
 354
 355   SendToNetwork(
 356       new ChromotingDesktopNetworkMsg_InjectClipboardEvent(serialized_event));
 357 }
 358
 359 void DesktopSessionAgent::ProcessAudioPacket(scoped_ptr<AudioPacket> packet) {
 360   DCHECK(audio_capture_task_runner_->BelongsToCurrentThread());
 361
 362   std::string serialized_packet;
 363   if (!packet->SerializeToString(&serialized_packet)) {
 364     LOG(ERROR) << "Failed to serialize AudioPacket.";
 365     return;
 366   }
 367
 368   SendToNetwork(new ChromotingDesktopNetworkMsg_AudioPacket(serialized_packet));
 369 }
 370
 371 bool DesktopSessionAgent::Start(const base::WeakPtr<Delegate>& delegate,
 372                                 IPC::PlatformFileForTransit* desktop_pipe_out) {
 373   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 374   DCHECK(delegate_.get() == nullptr);
 375
 376   delegate_ = delegate;
 377
 378   // Create an IPC channel to communicate with the network process.
 379   bool result = CreateConnectedIpcChannel(io_task_runner_,
 380                                           this,
 381                                           &desktop_pipe_,
 382                                           &network_channel_);
 383   base::PlatformFile raw_desktop_pipe = desktop_pipe_.GetPlatformFile();
 384 #if defined(OS_WIN)
 385   *desktop_pipe_out = IPC::PlatformFileForTransit(raw_desktop_pipe);
 386 #elif defined(OS_POSIX)
 387   *desktop_pipe_out = IPC::PlatformFileForTransit(raw_desktop_pipe, false);
 388 #else
 389 #error Unsupported platform.
 390 #endif
 391   return result;
 392 }
 393
 394 void DesktopSessionAgent::Stop() {
 395   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 396
 397   delegate_.reset();
 398
 399   // Make sure the channel is closed.
 400   network_channel_.reset();
 401
 402   if (started_) {
 403     started_ = false;
 404
 405     // Ignore any further callbacks.
 406     weak_factory_.InvalidateWeakPtrs();
 407     client_jid_.clear();
 408
 409     remote_input_filter_.reset();
 410
 411     // Ensure that any pressed keys or buttons are released.
 412     input_tracker_->ReleaseAll();
 413     input_tracker_.reset();
 414
 415     desktop_environment_.reset();
 416     input_injector_.reset();
 417     screen_controls_.reset();
 418
 419     // Stop the audio capturer.
 420     audio_capture_task_runner_->PostTask(
 421         FROM_HERE, base::Bind(&DesktopSessionAgent::StopAudioCapturer, this));
 422
 423     // Stop the video capturer.
 424     video_capture_task_runner_->PostTask(
 425         FROM_HERE, base::Bind(
 426             &DesktopSessionAgent::StopVideoCapturerAndMouseMonitor, this));
 427   }
 428 }
 429
 430 void DesktopSessionAgent::OnCaptureFrame() {
 431   if (!video_capture_task_runner_->BelongsToCurrentThread()) {
 432     video_capture_task_runner_->PostTask(
 433         FROM_HERE,
 434         base::Bind(&DesktopSessionAgent::OnCaptureFrame, this));
 435     return;
 436   }
 437
 438   mouse_cursor_monitor_->Capture();
 439
 440   // webrtc::DesktopCapturer supports a very few (currently 2) outstanding
 441   // capture requests. The requests are serialized on
 442   // |video_capture_task_runner()| task runner. If the client issues more
 443   // requests, pixel data in captured frames will likely be corrupted but
 444   // stability of webrtc::DesktopCapturer will not be affected.
 445   video_capturer_->Capture(webrtc::DesktopRegion());
 446 }
 447
 448 void DesktopSessionAgent::OnInjectClipboardEvent(
 449     const std::string& serialized_event) {
 450   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 451
 452   protocol::ClipboardEvent event;
 453   if (!event.ParseFromString(serialized_event)) {
 454     LOG(ERROR) << "Failed to parse protocol::ClipboardEvent.";
 455     return;
 456   }
 457
 458   // InputStub implementations must verify events themselves, so we don't need
 459   // verification here. This matches HostEventDispatcher.
 460   input_injector_->InjectClipboardEvent(event);
 461 }
 462
 463 void DesktopSessionAgent::OnInjectKeyEvent(
 464     const std::string& serialized_event) {
 465   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 466
 467   protocol::KeyEvent event;
 468   if (!event.ParseFromString(serialized_event)) {
 469     LOG(ERROR) << "Failed to parse protocol::KeyEvent.";
 470     return;
 471   }
 472
 473   // InputStub implementations must verify events themselves, so we need only
 474   // basic verification here. This matches HostEventDispatcher.
 475   if (!event.has_usb_keycode() || !event.has_pressed()) {
 476     LOG(ERROR) << "Received invalid key event.";
 477     return;
 478   }
 479
 480   remote_input_filter_->InjectKeyEvent(event);
 481 }
 482
 483 void DesktopSessionAgent::OnInjectTextEvent(
 484     const std::string& serialized_event) {
 485   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 486
 487   protocol::TextEvent event;
 488   if (!event.ParseFromString(serialized_event)) {
 489     LOG(ERROR) << "Failed to parse protocol::TextEvent.";
 490     return;
 491   }
 492
 493   // InputStub implementations must verify events themselves, so we need only
 494   // basic verification here. This matches HostEventDispatcher.
 495   if (!event.has_text()) {
 496     LOG(ERROR) << "Received invalid TextEvent.";
 497     return;
 498   }
 499
 500   remote_input_filter_->InjectTextEvent(event);
 501 }
 502
 503 void DesktopSessionAgent::OnInjectMouseEvent(
 504     const std::string& serialized_event) {
 505   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 506
 507   protocol::MouseEvent event;
 508   if (!event.ParseFromString(serialized_event)) {
 509     LOG(ERROR) << "Failed to parse protocol::MouseEvent.";
 510     return;
 511   }
 512
 513   // InputStub implementations must verify events themselves, so we don't need
 514   // verification here. This matches HostEventDispatcher.
 515   remote_input_filter_->InjectMouseEvent(event);
 516 }
 517
 518 void DesktopSessionAgent::SetScreenResolution(
 519     const ScreenResolution& resolution) {
 520   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 521
 522   if (screen_controls_ && resolution.IsEmpty())
 523     screen_controls_->SetScreenResolution(resolution);
 524 }
 525
 526 void DesktopSessionAgent::SendToNetwork(IPC::Message* message) {
 527   if (!caller_task_runner_->BelongsToCurrentThread()) {
 528     caller_task_runner_->PostTask(
 529         FROM_HERE,
 530         base::Bind(&DesktopSessionAgent::SendToNetwork, this, message));
 531     return;
 532   }
 533
 534   if (network_channel_) {
 535     network_channel_->Send(message);
 536   } else {
 537     delete message;
 538   }
 539 }
 540
 541 void DesktopSessionAgent::StartAudioCapturer() {
 542   DCHECK(audio_capture_task_runner_->BelongsToCurrentThread());
 543
 544   if (audio_capturer_) {
 545     audio_capturer_->Start(base::Bind(&DesktopSessionAgent::ProcessAudioPacket,
 546                                       this));
 547   }
 548 }
 549
 550 void DesktopSessionAgent::StopAudioCapturer() {
 551   DCHECK(audio_capture_task_runner_->BelongsToCurrentThread());
 552
 553   audio_capturer_.reset();
 554 }
 555
 556 void DesktopSessionAgent::StartVideoCapturerAndMouseMonitor() {
 557   DCHECK(video_capture_task_runner_->BelongsToCurrentThread());
 558
 559   if (video_capturer_) {
 560     video_capturer_->Start(this);
 561   }
 562
 563   if (mouse_cursor_monitor_) {
 564     mouse_cursor_monitor_->Init(this, webrtc::MouseCursorMonitor::SHAPE_ONLY);
 565   }
 566 }
 567
 568 void DesktopSessionAgent::StopVideoCapturerAndMouseMonitor() {
 569   DCHECK(video_capture_task_runner_->BelongsToCurrentThread());
 570
 571   video_capturer_.reset();
 572   last_frame_.reset();
 573   mouse_cursor_monitor_.reset();
 574
 575   // Video capturer must delete all buffers.
 576   DCHECK_EQ(shared_buffers_, 0);
 577 }
 578
 579 void DesktopSessionAgent::OnSharedBufferDeleted(int id) {
 580   DCHECK(video_capture_task_runner_->BelongsToCurrentThread());
 581   DCHECK(id != 0);
 582
 583   shared_buffers_--;
 584   DCHECK_GE(shared_buffers_, 0);
 585   SendToNetwork(new ChromotingDesktopNetworkMsg_ReleaseSharedBuffer(id));
 586 }
 587
 588 }  // namespace remoting