beginnings of metro viewer process

ui/viewer/viewer_ipc_server.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/viewer/viewer_ipc_server.h"
+
+#include "ui/viewer/viewer_messages.h"
+#include "ui/viewer/viewer_process.h"
+#include "ipc/ipc_logging.h"
+
+ViewerIPCServer::ViewerIPCServer(const IPC::ChannelHandle& channel_handle)
+    : client_connected_(false), channel_handle_(channel_handle) {
+}
+
+ViewerIPCServer::~ViewerIPCServer() {
+#ifdef IPC_MESSAGE_LOG_ENABLED
+  IPC::Logging::GetInstance()->SetIPCSender(NULL);
+#endif
+
+  channel_->RemoveFilter(sync_message_filter_.get());
+}
+
+bool ViewerIPCServer::Init() {
+#ifdef IPC_MESSAGE_LOG_ENABLED
+  IPC::Logging::GetInstance()->SetIPCSender(this);
+#endif
+  sync_message_filter_ =
+      new IPC::SyncMessageFilter(g_viewer_process->shutdown_event());
+  CreateChannel();
+  return true;
+}
+
+bool ViewerIPCServer::Send(IPC::Message* msg) {
+  if (!channel_.get()) {
+    delete msg;
+    return false;
+  }
+
+  return channel_->Send(msg);
+}
+
+bool ViewerIPCServer::OnMessageReceived(const IPC::Message& msg) {
+  bool handled = true;
+  // When we get a message, always mark the client as connected. The
+  // ChannelProxy::Context is only letting OnChannelConnected get called once,
+  // so on the Mac and Linux, we never would set client_connected_ to true
+  // again on subsequent connections.
+  client_connected_ = true;
+  IPC_BEGIN_MESSAGE_MAP(ViewerIPCServer, msg)
+    IPC_MESSAGE_HANDLER(ViewerMsg_PbufferHandle,
+                        OnPbufferHandle)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void ViewerIPCServer::OnChannelConnected(int32 peer_pid) {
+  DCHECK(!client_connected_);
+  client_connected_ = true;
+}
+
+void ViewerIPCServer::OnChannelError() {
+  // When a client (typically a browser process) disconnects, the pipe is
+  // closed and we get an OnChannelError. Since we want to keep servicing
+  // client requests, we will recreate the channel.
+  bool client_was_connected = client_connected_;
+  client_connected_ = false;
+  if (client_was_connected) {
+    if (g_viewer_process->HandleClientDisconnect()) {
+#if defined(OS_WIN)
+      // On Windows, once an error on a named pipe occurs, the named pipe is no
+      // longer valid and must be re-created. This is not the case on Mac or
+      // Linux.
+      CreateChannel();
+#endif
+    }
+  } else {
+    // If the client was never even connected we had an error connecting.
+    if (!client_connected_) {
+      LOG(ERROR) << "Unable to open viewer ipc channel "
+                 << "named: " << channel_handle_.name;
+    }
+  }
+}
+
+void ViewerIPCServer::OnPbufferHandle(const std::string& todo) {
+  NOTREACHED();
+}
+
+void ViewerIPCServer::CreateChannel() {
+  channel_.reset(NULL); // Tear down the existing channel, if any.
+  channel_.reset(new IPC::SyncChannel(channel_handle_,
+      IPC::Channel::MODE_NAMED_SERVER, this,
+      g_viewer_process->io_message_loop_proxy(), true,
+      g_viewer_process->shutdown_event()));
+  DCHECK(sync_message_filter_.get());
+  channel_->AddFilter(sync_message_filter_.get());
+}