arc-bridge: Split ArcBridgeService to common part and IPC based impl.

components/arc/arc_bridge_service_impl.cc

 // Copyright 2015 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 "components/arc/arc_bridge_service.h"
+#include "components/arc/arc_bridge_service_impl.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
+#include "base/sequenced_task_runner.h"
 #include "base/task_runner_util.h"
 #include "base/thread_task_runner_handle.h"
 #include "chromeos/chromeos_switches.h"
 #include "chromeos/dbus/dbus_method_call_status.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/session_manager_client.h"
 #include "components/arc/common/arc_host_messages.h"
 #include "components/arc/common/arc_instance_messages.h"
 #include "ipc/ipc_channel.h"
 
 namespace arc {
 
 namespace {
 
 const base::FilePath::CharType kArcBridgeSocketPath[] =
     FILE_PATH_LITERAL("/home/chronos/ArcBridge/bridge.sock");
 
-// Weak pointer.  This class is owned by ChromeBrowserMainPartsChromeos.
-ArcBridgeService* g_arc_bridge_service = nullptr;
-
 }  // namespace
 
-ArcBridgeService::ArcBridgeService(
+ArcBridgeServiceImpl::ArcBridgeServiceImpl(
     const scoped_refptr<base::SingleThreadTaskRunner>& ipc_task_runner,
     const scoped_refptr<base::SequencedTaskRunner>& file_task_runner)
-    : origin_task_runner_(base::ThreadTaskRunnerHandle::Get()),
-      ipc_task_runner_(ipc_task_runner),
+    : ipc_task_runner_(ipc_task_runner),
       file_task_runner_(file_task_runner),
       session_started_(false),
-      available_(false),
-      state_(State::STOPPED),
       weak_factory_(this) {
-  DCHECK(!g_arc_bridge_service);
-  g_arc_bridge_service = this;
 }
 
-ArcBridgeService::~ArcBridgeService() {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
-  DCHECK(state_ == State::STOPPING || state_ == State::STOPPED);
-  DCHECK(g_arc_bridge_service);
-  g_arc_bridge_service = nullptr;
+ArcBridgeServiceImpl::~ArcBridgeServiceImpl() {
 }
 
-// static
-ArcBridgeService* ArcBridgeService::Get() {
-  DCHECK(g_arc_bridge_service);
-  DCHECK(g_arc_bridge_service->origin_task_runner_->RunsTasksOnCurrentThread());
-  return g_arc_bridge_service;
-}
-
-// static
-bool ArcBridgeService::GetEnabled(const base::CommandLine* command_line) {
-  return command_line->HasSwitch(chromeos::switches::kEnableArc);
-}
-
-void ArcBridgeService::DetectAvailability() {
+void ArcBridgeServiceImpl::DetectAvailability() {
   chromeos::SessionManagerClient* session_manager_client =
       chromeos::DBusThreadManager::Get()->GetSessionManagerClient();
   session_manager_client->CheckArcAvailability(base::Bind(
-      &ArcBridgeService::OnArcAvailable, weak_factory_.GetWeakPtr()));
+      &ArcBridgeServiceImpl::OnArcAvailable, weak_factory_.GetWeakPtr()));
 }
 
-void ArcBridgeService::HandleStartup() {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
+void ArcBridgeServiceImpl::HandleStartup() {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
   session_started_ = true;
   PrerequisitesChanged();
 }
 
-void ArcBridgeService::Shutdown() {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
+void ArcBridgeServiceImpl::Shutdown() {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
   session_started_ = false;
   PrerequisitesChanged();
 }
 
-void ArcBridgeService::AddObserver(Observer* observer) {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
-  observer_list_.AddObserver(observer);
-}
-
-void ArcBridgeService::RemoveObserver(Observer* observer) {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
-  observer_list_.RemoveObserver(observer);
-}
-
-void ArcBridgeService::PrerequisitesChanged() {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
-  if (state_ == State::STOPPED) {
-    if (!available_ || !session_started_)
+void ArcBridgeServiceImpl::PrerequisitesChanged() {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
+  if (state() == State::STOPPED) {
+    if (!available() || !session_started_)
       return;
     SocketConnect(base::FilePath(kArcBridgeSocketPath));
   } else {
-    if (available_ && session_started_)
+    if (available() && session_started_)
       return;
     StopInstance();
   }
 }
 
-void ArcBridgeService::StopInstance() {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
-  if (state_ == State::STOPPED || state_ == State::STOPPING) {
+void ArcBridgeServiceImpl::StopInstance() {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
+  if (state() == State::STOPPED || state() == State::STOPPING) {
     VLOG(1) << "StopInstance() called when ARC is not running";
     return;
   }
-  if (state_ == State::CONNECTED || state_ == State::CONNECTING) {
+  if (state() == State::CONNECTED || state() == State::CONNECTING) {
     // This was stopped before the D-Bus command to start the instance. Just
     // close the socket (if it was opened).
-    if (state_ == State::CONNECTED) {
+    if (state() == State::CONNECTED) {
       ipc_channel_.reset();
     }
     SetState(State::STOPPED);
     return;
   }
 
   SetState(State::STOPPING);
   chromeos::SessionManagerClient* session_manager_client =
       chromeos::DBusThreadManager::Get()->GetSessionManagerClient();
   session_manager_client->StopArcInstance(base::Bind(
-      &ArcBridgeService::OnInstanceStopped, weak_factory_.GetWeakPtr()));
+      &ArcBridgeServiceImpl::OnInstanceStopped, weak_factory_.GetWeakPtr()));
 }
 
-bool ArcBridgeService::RegisterInputDevice(const std::string& name,
-                                           const std::string& device_type,
-                                           base::ScopedFD fd) {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
-  if (state_ != State::READY) {
+bool ArcBridgeServiceImpl::RegisterInputDevice(const std::string& name,
+                                               const std::string& device_type,
+                                               base::ScopedFD fd) {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
+  if (state() != State::READY) {
     LOG(ERROR) << "Called RegisterInputDevice when the service is not ready";
     return false;
   }
   return ipc_channel_->Send(new ArcInstanceMsg_RegisterInputDevice(
       name, device_type, base::FileDescriptor(fd.Pass())));
 }
 
-void ArcBridgeService::SocketConnect(const base::FilePath& socket_path) {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
-  if (state_ != State::STOPPED) {
+void ArcBridgeServiceImpl::SocketConnect(const base::FilePath& socket_path) {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
+  if (state() != State::STOPPED) {
     VLOG(1) << "SocketConnect() called when instance is not stopped";
     return;
   }
   SetState(State::CONNECTING);
   base::PostTaskAndReplyWithResult(
       file_task_runner_.get(), FROM_HERE,
       base::Bind(&base::CreateDirectory, socket_path.DirName()),
-      base::Bind(&ArcBridgeService::SocketConnectAfterEnsureParentDirectory,
+      base::Bind(&ArcBridgeServiceImpl::SocketConnectAfterEnsureParentDirectory,
                  weak_factory_.GetWeakPtr(), socket_path));
 }
 
-void ArcBridgeService::SocketConnectAfterEnsureParentDirectory(
+void ArcBridgeServiceImpl::SocketConnectAfterEnsureParentDirectory(
     const base::FilePath& socket_path,
     bool directory_present) {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
-  if (state_ != State::CONNECTING) {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
+  if (state() != State::CONNECTING) {
     VLOG(1) << "StopInstance() called while connecting";
     return;
   }
   if (!directory_present) {
     LOG(ERROR) << "Error creating directory for " << socket_path.value();
     StopInstance();
     return;
   }
 
   if (!Connect(IPC::ChannelHandle(socket_path.value()),
                IPC::Channel::MODE_OPEN_NAMED_SERVER)) {
     LOG(ERROR) << "Error connecting to " << socket_path.value();
     StopInstance();
     return;
   }
 
   base::PostTaskAndReplyWithResult(
       file_task_runner_.get(), FROM_HERE,
       // TODO(lhchavez): Tighten the security around the socket by tying it to
       // the user the instance will run as.
       base::Bind(&base::SetPosixFilePermissions, socket_path, 0777),
-      base::Bind(&ArcBridgeService::SocketConnectAfterSetSocketPermissions,
+      base::Bind(&ArcBridgeServiceImpl::SocketConnectAfterSetSocketPermissions,
                  weak_factory_.GetWeakPtr(), socket_path));
 }
 
-bool ArcBridgeService::Connect(const IPC::ChannelHandle& handle,
-                               IPC::Channel::Mode mode) {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
-  if (state_ != State::CONNECTING) {
+bool ArcBridgeServiceImpl::Connect(const IPC::ChannelHandle& handle,
+                                   IPC::Channel::Mode mode) {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
+  if (state() != State::CONNECTING) {
     VLOG(1) << "StopInstance() called while connecting";
     return false;
   }
 
   ipc_channel_ =
       IPC::ChannelProxy::Create(handle, mode, this, ipc_task_runner_.get());
   if (!ipc_channel_)
     return false;
   SetState(State::CONNECTED);
   return true;
 }
 
-void ArcBridgeService::SocketConnectAfterSetSocketPermissions(
+void ArcBridgeServiceImpl::SocketConnectAfterSetSocketPermissions(
     const base::FilePath& socket_path,
     bool socket_permissions_success) {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
-  if (state_ != State::CONNECTED) {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
+  if (state() != State::CONNECTED) {
     VLOG(1) << "StopInstance() called while connecting";
     return;
   }
 
   if (!socket_permissions_success) {
     LOG(ERROR) << "Error setting socket permissions for "
                << socket_path.value();
     StopInstance();
     return;
   }
 
   SetState(State::STARTING);
   chromeos::SessionManagerClient* session_manager_client =
       chromeos::DBusThreadManager::Get()->GetSessionManagerClient();
   session_manager_client->StartArcInstance(
-      socket_path.value(), base::Bind(&ArcBridgeService::OnInstanceStarted,
+      socket_path.value(), base::Bind(&ArcBridgeServiceImpl::OnInstanceStarted,
                                       weak_factory_.GetWeakPtr()));
 }
 
-void ArcBridgeService::OnInstanceStarted(bool success) {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
-  if (state_ != State::STARTING) {
+void ArcBridgeServiceImpl::OnInstanceStarted(bool success) {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
+  if (state() != State::STARTING) {
     VLOG(1) << "StopInstance() called while connecting";
     return;
   }
   if (!success) {
     LOG(ERROR) << "ARC instance unable to start. Shutting down the bridge";
     StopInstance();
     return;
   }
 }
 
-void ArcBridgeService::OnInstanceBootPhase(InstanceBootPhase phase) {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
+void ArcBridgeServiceImpl::OnInstanceBootPhase(InstanceBootPhase phase) {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
   // The state can be STARTING the first time this is called, and will then
   // transition to READY after BRIDGE_READY has been passed.
-  if (state_ != State::STARTING && state_ != State::READY) {
+  if (state() != State::STARTING && state() != State::READY) {
     VLOG(1) << "StopInstance() called while connecting";
     return;
   }
   if (phase == InstanceBootPhase::BRIDGE_READY) {
     SetState(State::READY);
   }
-  FOR_EACH_OBSERVER(Observer, observer_list_, OnInstanceBootPhase(phase));
+  FOR_EACH_OBSERVER(Observer, observer_list(), OnInstanceBootPhase(phase));
 }
 
-void ArcBridgeService::SetState(State state) {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
-  // DCHECK on enum classes not supported.
-  DCHECK(state_ != state);
-  state_ = state;
-  FOR_EACH_OBSERVER(Observer, observer_list_, OnStateChanged(state_));
-}
-
-bool ArcBridgeService::OnMessageReceived(const IPC::Message& message) {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
+bool ArcBridgeServiceImpl::OnMessageReceived(const IPC::Message& message) {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
   bool handled = true;
 
-  IPC_BEGIN_MESSAGE_MAP(ArcBridgeService, message)
+  IPC_BEGIN_MESSAGE_MAP(ArcBridgeServiceImpl, message)
     IPC_MESSAGE_HANDLER(ArcInstanceHostMsg_InstanceBootPhase,
                         OnInstanceBootPhase)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
   if (!handled)
     LOG(ERROR) << "Invalid message with type = " << message.type();
   return handled;
 }
 
-void ArcBridgeService::OnArcAvailable(bool available) {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
-  if (available_ == available)
+void ArcBridgeServiceImpl::OnArcAvailable(bool arc_available) {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
+  if (available() == arc_available)
     return;
-  available_ = available;
-  FOR_EACH_OBSERVER(Observer, observer_list_, OnAvailableChanged(available_));
+  SetAvailable(arc_available);
   PrerequisitesChanged();
 }
 
-void ArcBridgeService::OnInstanceStopped(bool success) {
-  DCHECK(origin_task_runner_->RunsTasksOnCurrentThread());
+void ArcBridgeServiceImpl::OnInstanceStopped(bool success) {
+  DCHECK(origin_task_runner()->RunsTasksOnCurrentThread());
   // STOPPING is the only valid state for this function.
   // DCHECK on enum classes not supported.
-  DCHECK(state_ == State::STOPPING);
+  DCHECK(state() == State::STOPPING);
   ipc_channel_.reset();
   SetState(State::STOPPED);
 }
 
 }  // namespace arc