mirror of
https://github.com/kidfromjupiter/nearby.git
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123 lines
5.0 KiB
C++
123 lines
5.0 KiB
C++
// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef THIRD_PARTY_NEARBY_INTERNAL_PLATFORM_IMPLEMENTATION_WINDOWS_BLE_MEDIUM_H_
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#define THIRD_PARTY_NEARBY_INTERNAL_PLATFORM_IMPLEMENTATION_WINDOWS_BLE_MEDIUM_H_
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#include <guiddef.h>
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#include <future> // NOLINT
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#include <memory>
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#include <string>
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#include <utility>
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#include "absl/container/flat_hash_map.h"
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#include "absl/synchronization/mutex.h"
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#include "internal/platform/implementation/ble.h"
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#include "internal/platform/implementation/bluetooth_adapter.h"
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#include "internal/platform/implementation/windows/ble.h"
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#include "internal/platform/implementation/windows/bluetooth_adapter.h"
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#include "winrt/Windows.Devices.Bluetooth.Advertisement.h"
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namespace nearby {
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namespace windows {
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// Only Fast Advertisement is supported where the remote device's static
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// bluetooth MAC address is resolved from Nearby Share Contact certificates
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// using salt and encrypted_metadata_key from the BLE advertisement packet.
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// The MAC address is then used directly to establish a Bluetooth Classic
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// RFCOMM socket.
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// Container of operations that can be performed over the BLE medium.
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class BleMedium : public api::BleMedium {
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public:
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explicit BleMedium(api::BluetoothAdapter& adapter);
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~BleMedium() override = default;
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bool StartAdvertising(
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const std::string& service_id, const ByteArray& advertisement_bytes,
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const std::string& fast_advertisement_service_uuid) override;
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bool StopAdvertising(const std::string& service_id) override;
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// Returns true once the BLE scan has been initiated.
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bool StartScanning(const std::string& service_id,
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const std::string& fast_advertisement_service_uuid,
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DiscoveredPeripheralCallback callback) override;
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// Returns true once BLE scanning for service_id is well and truly stopped;
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// after this returns, there must be no more invocations of the
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// DiscoveredPeripheralCallback passed in to StartScanning() for service_id.
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bool StopScanning(const std::string& service_id) override;
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// Returns true once BLE socket connection requests to service_id can be
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// accepted.
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bool StartAcceptingConnections(const std::string& service_id,
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AcceptedConnectionCallback callback) override;
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bool StopAcceptingConnections(const std::string& service_id) override;
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// Connects to a BLE peripheral.
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// On success, returns a new BleSocket.
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// On error, returns nullptr.
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std::unique_ptr<api::BleSocket> Connect(api::BlePeripheral& peripheral,
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const std::string& service_id,
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CancellationFlag* cancellation_flag);
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private:
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void PublisherHandler(
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::winrt::Windows::Devices::Bluetooth::Advertisement::
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BluetoothLEAdvertisementPublisher publisher,
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::winrt::Windows::Devices::Bluetooth::Advertisement::
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BluetoothLEAdvertisementPublisherStatusChangedEventArgs args);
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void AdvertisementReceivedHandler(
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::winrt::Windows::Devices::Bluetooth::Advertisement::
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BluetoothLEAdvertisementWatcher watcher,
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::winrt::Windows::Devices::Bluetooth::Advertisement::
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BluetoothLEAdvertisementReceivedEventArgs args);
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void WatcherHandler(::winrt::Windows::Devices::Bluetooth::Advertisement::
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BluetoothLEAdvertisementWatcher watcher,
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::winrt::Windows::Devices::Bluetooth::Advertisement::
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BluetoothLEAdvertisementWatcherStoppedEventArgs args);
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BluetoothAdapter* adapter_;
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std::string service_id_;
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DiscoveredPeripheralCallback advertisement_received_callback_;
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// Map to protect the pointer for BlePeripheral because
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// DiscoveredPeripheralCallback only keeps the pointer to the object
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absl::Mutex peripheral_map_mutex_;
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absl::flat_hash_map<std::string, std::unique_ptr<BlePeripheral>>
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peripheral_map_ ABSL_GUARDED_BY(peripheral_map_mutex_);
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// WinRT objects
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::winrt::Windows::Devices::Bluetooth::Advertisement::
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BluetoothLEAdvertisementPublisher publisher_ = nullptr;
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::winrt::Windows::Devices::Bluetooth::Advertisement::
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BluetoothLEAdvertisementWatcher watcher_ = nullptr;
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bool is_publisher_started_ = false;
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bool is_watcher_started_ = false;
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::winrt::event_token publisher_token_;
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::winrt::event_token watcher_token_;
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::winrt::event_token advertisement_received_token_;
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};
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} // namespace windows
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} // namespace nearby
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#endif // THIRD_PARTY_NEARBY_INTERNAL_PLATFORM_IMPLEMENTATION_WINDOWS_BLE_MEDIUM_H_
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