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// 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 "device/devices_app/devices_app.h"
#include <stdint.h>
#include <utility>
#include "base/bind.h"
#include "base/callback.h"
#include "base/macros.h"
#include "base/sequenced_task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "base/threading/thread.h"
#include "base/time/time.h"
#include "device/core/device_client.h"
#include "device/devices_app/usb/device_manager_impl.h"
#include "device/usb/usb_service.h"
#include "mojo/application/public/cpp/application_connection.h"
#include "mojo/application/public/cpp/application_impl.h"
#include "mojo/public/cpp/bindings/interface_request.h"
#include "url/gurl.h"
namespace device {
namespace {
// The number of seconds to wait without any bound DeviceManagers before
// exiting the app.
const int64_t kIdleTimeoutInSeconds = 10;
// A DeviceClient implementation to be constructed iff the app is not running
// in an embedder that provides a DeviceClient (i.e. running as a standalone
// Mojo app, not in Chrome).
class AppDeviceClient : public DeviceClient {
public:
explicit AppDeviceClient(
scoped_refptr<base::SequencedTaskRunner> blocking_task_runner)
: blocking_task_runner_(blocking_task_runner) {}
~AppDeviceClient() override {}
private:
// DeviceClient:
UsbService* GetUsbService() override {
if (!usb_service_) {
usb_service_ = UsbService::Create(blocking_task_runner_);
}
return usb_service_.get();
}
scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
scoped_ptr<UsbService> usb_service_;
};
} // namespace
// This class insures that a UsbService has been initialized and is accessible
// via the DeviceClient interface.
class DevicesApp::USBServiceInitializer {
public:
USBServiceInitializer()
: blocking_thread_("USB service blocking I/O thread") {
blocking_thread_.Start();
app_device_client_.reset(
new AppDeviceClient(blocking_thread_.task_runner()));
}
~USBServiceInitializer() {}
private:
scoped_ptr<AppDeviceClient> app_device_client_;
base::Thread blocking_thread_;
DISALLOW_COPY_AND_ASSIGN(USBServiceInitializer);
};
DevicesApp::DevicesApp()
: app_impl_(nullptr), active_device_manager_count_(0) {}
DevicesApp::~DevicesApp() {
}
void DevicesApp::Initialize(mojo::ApplicationImpl* app) {
app_impl_ = app;
service_initializer_.reset(new USBServiceInitializer);
StartIdleTimer();
}
bool DevicesApp::ConfigureIncomingConnection(
mojo::ApplicationConnection* connection) {
connection->AddService<usb::DeviceManager>(this);
return true;
}
void DevicesApp::Quit() {
service_initializer_.reset();
app_impl_ = nullptr;
}
void DevicesApp::Create(mojo::ApplicationConnection* connection,
mojo::InterfaceRequest<usb::DeviceManager> request) {
// Bind the new device manager to the connecting application's permission
// provider.
usb::PermissionProviderPtr permission_provider;
connection->ConnectToService(&permission_provider);
// Owned by its message pipe.
usb::DeviceManagerImpl* device_manager = new usb::DeviceManagerImpl(
std::move(permission_provider), std::move(request));
device_manager->set_connection_error_handler(
base::Bind(&DevicesApp::OnConnectionError, base::Unretained(this)));
active_device_manager_count_++;
idle_timeout_callback_.Cancel();
}
void DevicesApp::OnConnectionError() {
DCHECK_GE(active_device_manager_count_, 0u);
active_device_manager_count_--;
if (active_device_manager_count_ == 0) {
// If the last DeviceManager connection has been dropped, kick off an idle
// timeout to shut ourselves down.
StartIdleTimer();
}
}
void DevicesApp::StartIdleTimer() {
// Passing unretained |app_impl_| is safe here because |app_impl_| is
// guaranteed to outlive |this|, and the callback is canceled if |this| is
// destroyed.
idle_timeout_callback_.Reset(base::Bind(&mojo::ApplicationImpl::Quit,
base::Unretained(app_impl_)));
base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
FROM_HERE, idle_timeout_callback_.callback(),
base::TimeDelta::FromSeconds(kIdleTimeoutInSeconds));
}
} // namespace device
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