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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_ASH_SECURE_CHANNEL_NEARBY_CONNECTION_BROKER_IMPL_H_
#define CHROME_BROWSER_ASH_SECURE_CHANNEL_NEARBY_CONNECTION_BROKER_IMPL_H_
#include <memory>
#include <ostream>
#include "base/containers/flat_map.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/task/sequenced_task_runner.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "chrome/browser/ash/secure_channel/nearby_connection_broker.h"
#include "chromeos/ash/services/nearby/public/mojom/nearby_connections.mojom.h"
#include "chromeos/ash/services/secure_channel/public/mojom/nearby_connector.mojom-shared.h"
#include "chromeos/ash/services/secure_channel/public/mojom/nearby_connector.mojom.h"
#include "chromeos/ash/services/secure_channel/public/mojom/secure_channel_types.mojom.h"
#include "chromeos/ash/services/secure_channel/util/histogram_util.h"
#include "mojo/public/cpp/bindings/shared_remote.h"
namespace ash {
namespace secure_channel {
class NearbyEndpointFinder;
// NearbyConnectionBroker implementation which utilizes NearbyEndpointFinder to
// find an endpoint, then uses Nearby Connections to create and maintain a
// connection. The overall process consists of:
// (1) Finding an endpoint via NearbyEndpointFinder.
// (2) Requesting a connection using that endpoint.
// (3) Accepting a connection.
// (4) Exchanging messages over the connection.
//
// Deleting an instance of this class tears down any active connection and
// performs cleanup if necessary.
class NearbyConnectionBrokerImpl
: public NearbyConnectionBroker,
public ::nearby::connections::mojom::ConnectionLifecycleListener,
public ::nearby::connections::mojom::PayloadListener {
public:
class Factory {
public:
static std::unique_ptr<NearbyConnectionBroker> Create(
const std::vector<uint8_t>& bluetooth_public_address,
const std::vector<uint8_t>& eid,
NearbyEndpointFinder* endpoint_finder,
mojo::PendingReceiver<mojom::NearbyMessageSender>
message_sender_receiver,
mojo::PendingReceiver<mojom::NearbyFilePayloadHandler>
file_payload_handler_receiver,
mojo::PendingRemote<mojom::NearbyMessageReceiver>
message_receiver_remote,
mojo::PendingRemote<mojom::NearbyConnectionStateListener>
nearby_connection_state_listener,
const mojo::SharedRemote<
::nearby::connections::mojom::NearbyConnections>&
nearby_connections,
base::OnceClosure on_connected_callback,
base::OnceClosure on_disconnected_callback,
std::unique_ptr<base::OneShotTimer> timer =
std::make_unique<base::OneShotTimer>());
static void SetFactoryForTesting(Factory* test_factory);
virtual ~Factory() = default;
protected:
virtual std::unique_ptr<NearbyConnectionBroker> CreateInstance(
const std::vector<uint8_t>& bluetooth_public_address,
NearbyEndpointFinder* endpoint_finder,
mojo::PendingReceiver<mojom::NearbyMessageSender>
message_sender_receiver,
mojo::PendingReceiver<mojom::NearbyFilePayloadHandler>
file_payload_handler_receiver,
mojo::PendingRemote<mojom::NearbyMessageReceiver>
message_receiver_remote,
mojo::PendingRemote<mojom::NearbyConnectionStateListener>
nearby_connection_state_listener,
const mojo::SharedRemote<
::nearby::connections::mojom::NearbyConnections>&
nearby_connections,
base::OnceClosure on_connected_callback,
base::OnceClosure on_disconnected_callback,
std::unique_ptr<base::OneShotTimer> timer) = 0;
};
~NearbyConnectionBrokerImpl() override;
private:
enum class ConnectionStatus {
kUninitialized,
kDiscoveringEndpoint,
kRequestingConnection,
kAcceptingConnection,
kWaitingForConnectionToBeAcceptedByRemoteDevice,
kConnected,
kDisconnecting,
kDisconnected,
};
friend std::ostream& operator<<(
std::ostream& stream,
NearbyConnectionBrokerImpl::ConnectionStatus status);
NearbyConnectionBrokerImpl(
const std::vector<uint8_t>& bluetooth_public_address,
const std::vector<uint8_t>& eid,
NearbyEndpointFinder* endpoint_finder,
mojo::PendingReceiver<mojom::NearbyMessageSender> message_sender_receiver,
mojo::PendingReceiver<mojom::NearbyFilePayloadHandler>
file_payload_handler_receiver,
mojo::PendingRemote<mojom::NearbyMessageReceiver> message_receiver_remote,
mojo::PendingRemote<mojom::NearbyConnectionStateListener>
nearby_connection_state_listener,
const mojo::SharedRemote<::nearby::connections::mojom::NearbyConnections>&
nearby_connections,
base::OnceClosure on_connected_callback,
base::OnceClosure on_disconnected_callback,
std::unique_ptr<base::OneShotTimer> timer);
void TransitionToStatus(ConnectionStatus connection_status);
void Disconnect(util::NearbyDisconnectionReason reason);
void TransitionToDisconnectedAndInvokeCallback();
void OnEndpointDiscovered(
const std::string& endpoint_id,
::nearby::connections::mojom::DiscoveredEndpointInfoPtr info);
void OnDiscoveryFailure(::nearby::connections::mojom::Status status);
void OnRequestConnectionResult(::nearby::connections::mojom::Status status);
void OnAcceptConnectionResult(::nearby::connections::mojom::Status status);
void OnSendPayloadResult(SendMessageCallback callback,
::nearby::connections::mojom::Status status);
void OnDisconnectFromEndpointResult(
::nearby::connections::mojom::Status status);
void OnConnectionStatusChangeTimeout();
void OnPayloadFileRegistered(
int64_t payload_id,
mojo::PendingRemote<mojom::FilePayloadListener> listener,
RegisterPayloadFileCallback callback,
::nearby::connections::mojom::Status status);
void OnFilePayloadListenerDisconnect(int64_t payload_id);
void CleanUpPendingFileTransfers();
// NearbyConnectionBroker:
void OnMojoDisconnection() override;
// mojom::NearbyMessageSender:
void SendMessage(const std::string& message,
SendMessageCallback callback) override;
// mojom::NearbyFilePayloadHandler:
void RegisterPayloadFile(
int64_t payload_id,
mojom::PayloadFilesPtr payload_files,
mojo::PendingRemote<mojom::FilePayloadListener> listener,
RegisterPayloadFileCallback callback) override;
// ::nearby::connections::mojom::ConnectionLifecycleListener:
void OnConnectionInitiated(
const std::string& endpoint_id,
::nearby::connections::mojom::ConnectionInfoPtr info) override;
void OnConnectionAccepted(const std::string& endpoint_id) override;
void OnConnectionRejected(const std::string& endpoint_id,
::nearby::connections::mojom::Status status) override;
void OnDisconnected(const std::string& endpoint_id) override;
void OnBandwidthChanged(const std::string& endpoint_id,
::nearby::connections::mojom::Medium medium) override;
// ::nearby::connections::mojom::PayloadListener:
void OnPayloadReceived(
const std::string& endpoint_id,
::nearby::connections::mojom::PayloadPtr payload) override;
void OnPayloadTransferUpdate(
const std::string& endpoint_id,
::nearby::connections::mojom::PayloadTransferUpdatePtr update) override;
raw_ptr<NearbyEndpointFinder> endpoint_finder_;
mojo::SharedRemote<::nearby::connections::mojom::NearbyConnections>
nearby_connections_;
std::unique_ptr<base::OneShotTimer> timer_;
mojo::Receiver<::nearby::connections::mojom::ConnectionLifecycleListener>
connection_lifecycle_listener_receiver_{this};
mojo::Receiver<::nearby::connections::mojom::PayloadListener>
payload_listener_receiver_{this};
ConnectionStatus connection_status_ = ConnectionStatus::kUninitialized;
// Starts empty, then set in OnEndpointDiscovered().
std::string remote_endpoint_id_;
// Starts as false and changes to true when WebRTC upgrade occurs.
bool has_upgraded_to_webrtc_ = false;
// Whether or not a metric has been logged to note that a metric has been
// logged indicated that Disconnect() was called before a WebRTC upgrade
// occurred.
bool has_recorded_no_webrtc_metric_ = false;
// Starts as false; set to true in OnConnectionInitiated() and back to false
// in OnDisconnected().
bool need_to_disconnect_endpoint_ = false;
// Starts as null; set in OnConnectionAccepted().
base::Time time_when_connection_accepted_;
bool has_disconnect_reason_been_logged_ = false;
// Listeners for file payloads registered via RegisterPayloadFile(), keyed by
// payload ID.
base::flat_map<int64_t, mojo::Remote<mojom::FilePayloadListener>>
file_payload_listeners_;
// TaskRunner to close received payload files.
const scoped_refptr<base::SequencedTaskRunner> task_runner_;
base::WeakPtrFactory<NearbyConnectionBrokerImpl> weak_ptr_factory_{this};
};
std::ostream& operator<<(std::ostream& stream,
NearbyConnectionBrokerImpl::ConnectionStatus status);
} // namespace secure_channel
} // namespace ash
#endif // CHROME_BROWSER_ASH_SECURE_CHANNEL_NEARBY_CONNECTION_BROKER_IMPL_H_
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