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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_QUICK_PAIR_MESSAGE_STREAM_MESSAGE_STREAM_LOOKUP_IMPL_H_
#define ASH_QUICK_PAIR_MESSAGE_STREAM_MESSAGE_STREAM_LOOKUP_IMPL_H_
#include "ash/quick_pair/message_stream/message_stream_lookup.h"
#include <string>
#include "ash/quick_pair/message_stream/message_stream.h"
#include "base/containers/flat_map.h"
#include "base/containers/flat_set.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/scoped_observation.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "device/bluetooth/bluetooth_adapter.h"
namespace device {
class BluetoothDevice;
class BluetoothSocket;
} // namespace device
namespace ash {
namespace quick_pair {
class MessageStreamLookupImpl : public MessageStreamLookup,
public device::BluetoothAdapter::Observer {
public:
MessageStreamLookupImpl();
MessageStreamLookupImpl(const MessageStreamLookupImpl&) = delete;
MessageStreamLookupImpl& operator=(const MessageStreamLookupImpl&) = delete;
~MessageStreamLookupImpl() override;
void AddObserver(MessageStreamLookup::Observer* observer) override;
void RemoveObserver(MessageStreamLookup::Observer* observer) override;
MessageStream* GetMessageStream(const std::string& device_address) override;
private:
// Enum class to bind to attempts to create RFCOMM channels for logging which
// BluetoothAdapter API triggers succeeded and failed.
enum class CreateMessageStreamAttemptType {
kDeviceConnectedStateChanged = 0,
kDeviceAdded = 1,
kDevicePairedChanged = 2,
kDeviceChanged = 3,
};
// Helper function to be used in log messages to understand success and errors
// for creating RFCOMM channel to the device.
std::string CreateMessageStreamAttemptTypeToString(
const CreateMessageStreamAttemptType& type);
// device::BluetoothAdapter::Observer
void DeviceConnectedStateChanged(device::BluetoothAdapter* adapter,
device::BluetoothDevice* device,
bool is_now_connected) override;
void DeviceRemoved(device::BluetoothAdapter* adapter,
device::BluetoothDevice* device) override;
void DeviceAdded(device::BluetoothAdapter* adapter,
device::BluetoothDevice* device) override;
void DevicePairedChanged(device::BluetoothAdapter* adapter,
device::BluetoothDevice* device,
bool new_paired_status) override;
void DeviceChanged(device::BluetoothAdapter* adapter,
device::BluetoothDevice* device) override;
// Helper functions to create and remove message stream objects and open and
// close RFCOMM channels based on whether the device is connected or
// disconnected from the adapter.
void AttemptCreateMessageStream(const std::string& device_address,
const CreateMessageStreamAttemptType& type);
void AttemptRemoveMessageStream(const std::string& device_address);
// Create RFCOMM connection callbacks.
void OnConnected(std::string device_address,
base::TimeTicks connect_to_service_start_time,
const CreateMessageStreamAttemptType& type,
scoped_refptr<device::BluetoothSocket> socket);
void OnConnectError(std::string device_address,
const CreateMessageStreamAttemptType& type,
const std::string& error_message);
// Helper function to disconnect socket from a MessageStream instance and
// destroy the MessageStream instance. Used by both |RemoveMessageStream| and
// |DeviceRemoved|.
void AttemptEraseMessageStream(const std::string& device_address);
// Callback for disconnected the socket from the MessageStream.
void OnSocketDisconnected(const std::string& device_address);
// Internal method called by BluetoothAdapterFactory to provide the adapter
// object.
void OnGetAdapter(scoped_refptr<device::BluetoothAdapter> adapter);
// Maps devices addresses to message stream attempt counts and retry timers,
// respectively.
base::flat_map<std::string, int> create_message_stream_attempts_;
base::flat_map<std::string, std::unique_ptr<base::OneShotTimer>>
create_message_stream_retry_timers_;
base::ObserverList<MessageStreamLookup::Observer> observers_;
base::flat_map<std::string, std::unique_ptr<MessageStream>> message_streams_;
scoped_refptr<device::BluetoothAdapter> adapter_;
base::flat_set<std::string> pending_connect_requests_;
base::ScopedObservation<device::BluetoothAdapter,
device::BluetoothAdapter::Observer>
adapter_observation_{this};
base::WeakPtrFactory<MessageStreamLookupImpl> weak_ptr_factory_{this};
};
} // namespace quick_pair
} // namespace ash
#endif // ASH_QUICK_PAIR_MESSAGE_STREAM_MESSAGE_STREAM_LOOKUP_IMPL_H_
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