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// 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 "chromeos/dbus/services/cros_dbus_service.h"
#include "base/bind.h"
#include "base/stl_util.h"
#include "base/sys_info.h"
#include "base/threading/platform_thread.h"
#include "chromeos/dbus/dbus_thread_manager.h"
#include "dbus/bus.h"
#include "dbus/exported_object.h"
#include "dbus/object_path.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
namespace chromeos {
namespace {
CrosDBusService* g_cros_dbus_service = NULL;
} // namespace
// The CrosDBusService implementation used in production, and unit tests.
class CrosDBusServiceImpl : public CrosDBusService {
public:
CrosDBusServiceImpl(dbus::Bus* bus,
ScopedVector<ServiceProviderInterface> service_providers)
: service_started_(false),
origin_thread_id_(base::PlatformThread::CurrentId()),
bus_(bus),
service_providers_(service_providers.Pass()) {
}
~CrosDBusServiceImpl() override {
}
// Starts the D-Bus service.
void Start() {
// Make sure we're running on the origin thread (i.e. the UI thread in
// production).
DCHECK(OnOriginThread());
// Return if the service has been already started.
if (service_started_)
return;
// There are some situations, described in http://crbug.com/234382#c27,
// where processes on Linux can wind up stuck in an uninterruptible state
// for tens of seconds. If this happens when Chrome is trying to exit,
// this unkillable process can wind up clinging to ownership of
// kLibCrosServiceName while the system is trying to restart the browser.
// This leads to a fatal situation if we don't allow the new browser
// instance to replace the old as the owner of kLibCrosServiceName as seen
// in http://crbug.com/234382. Hence, REQUIRE_PRIMARY_ALLOW_REPLACEMENT.
bus_->RequestOwnership(kLibCrosServiceName,
dbus::Bus::REQUIRE_PRIMARY_ALLOW_REPLACEMENT,
base::Bind(&CrosDBusServiceImpl::OnOwnership,
base::Unretained(this)));
exported_object_ = bus_->GetExportedObject(
dbus::ObjectPath(kLibCrosServicePath));
for (size_t i = 0; i < service_providers_.size(); ++i)
service_providers_[i]->Start(exported_object_);
service_started_ = true;
VLOG(1) << "CrosDBusServiceImpl started.";
}
private:
// Returns true if the current thread is on the origin thread.
bool OnOriginThread() {
return base::PlatformThread::CurrentId() == origin_thread_id_;
}
// Called when an ownership request is completed.
void OnOwnership(const std::string& service_name,
bool success) {
LOG_IF(FATAL, !success) << "Failed to own: " << service_name;
}
bool service_started_;
base::PlatformThreadId origin_thread_id_;
dbus::Bus* bus_;
scoped_refptr<dbus::ExportedObject> exported_object_;
// Service providers that form CrosDBusService.
ScopedVector<ServiceProviderInterface> service_providers_;
};
// The stub CrosDBusService implementation used on Linux desktop,
// which does nothing as of now.
class CrosDBusServiceStubImpl : public CrosDBusService {
public:
CrosDBusServiceStubImpl() {
}
virtual ~CrosDBusServiceStubImpl() {
}
};
// static
void CrosDBusService::Initialize(
ScopedVector<ServiceProviderInterface> service_providers) {
if (g_cros_dbus_service) {
LOG(WARNING) << "CrosDBusService was already initialized";
return;
}
dbus::Bus* bus = DBusThreadManager::Get()->GetSystemBus();
if (base::SysInfo::IsRunningOnChromeOS() && bus) {
auto* service = new CrosDBusServiceImpl(bus, service_providers.Pass());
g_cros_dbus_service = service;
service->Start();
} else {
g_cros_dbus_service = new CrosDBusServiceStubImpl;
}
VLOG(1) << "CrosDBusService initialized";
}
// static
void CrosDBusService::InitializeForTesting(
dbus::Bus* bus,
ScopedVector<ServiceProviderInterface> service_providers) {
if (g_cros_dbus_service) {
LOG(WARNING) << "CrosDBusService was already initialized";
return;
}
auto* service = new CrosDBusServiceImpl(bus, service_providers.Pass());
service->Start();
g_cros_dbus_service = service;
VLOG(1) << "CrosDBusService initialized";
}
// static
void CrosDBusService::Shutdown() {
delete g_cros_dbus_service;
g_cros_dbus_service = NULL;
VLOG(1) << "CrosDBusService Shutdown completed";
}
CrosDBusService::~CrosDBusService() {
}
CrosDBusService::ServiceProviderInterface::~ServiceProviderInterface() {
}
} // namespace chromeos
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