mirror of
https://github.com/kidfromjupiter/nearby.git
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83 lines
2.7 KiB
C++
83 lines
2.7 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 CORE_INTERNAL_MEDIUMS_BLE_V2_H_
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#define CORE_INTERNAL_MEDIUMS_BLE_V2_H_
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#include <cstdint>
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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 "third_party/nearby/cpp/core/internal/mediums/bluetooth_radio.h"
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#include "third_party/nearby/cpp/platform/base/byte_array.h"
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#include "third_party/nearby/cpp/platform/public/mutex.h"
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namespace location {
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namespace nearby {
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namespace connections {
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class BleV2 {
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public:
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explicit BleV2(BluetoothRadio& bluetooth_radio);
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~BleV2() = default;
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private:
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// Container that stores info about a GATT advertisement.
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struct GattAdvertisementInfo {
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bool Empty() const { return gatt_advertisements.empty(); }
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void Clear() { gatt_advertisements.clear(); }
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void Add(int slot, std::pair<std::string, ByteArray> gatt_advertisement) {
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gatt_advertisements.insert({slot, gatt_advertisement});
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}
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void Remove(int slot) { gatt_advertisements.erase(slot); }
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bool Existed(int slot) const {
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return gatt_advertisements.contains(slot);
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}
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std::pair<std::string, ByteArray> GetAdvertisement(int slot) {
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const auto& it = gatt_advertisements.find(slot);
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if (it == gatt_advertisements.end()) {
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return {};
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}
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return it->second;
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}
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// A map of slot -> pair of {service_id, gatt_advertisement}
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absl::flat_hash_map<int, std::pair<std::string, ByteArray>>
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gatt_advertisements;
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};
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static constexpr int kMaxAdvertisementLength = 512;
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static constexpr int kDummyServiceIdLength = 128;
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static ByteArray GenerateAdvertisementHash(
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const ByteArray& advertisement_bytes);
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static ByteArray GenerateHash(const std::string& source, size_t size);
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static ByteArray GenerateDeviceToken();
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ByteArray CreateAdvertisementHeader() ABSL_SHARED_LOCKS_REQUIRED(mutex_);
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mutable Mutex mutex_;
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BluetoothRadio& radio_ ABSL_GUARDED_BY(mutex_);
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BluetoothAdapter& adapter_ ABSL_GUARDED_BY(mutex_){
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radio_.GetBluetoothAdapter()};
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GattAdvertisementInfo gatt_advertisement_info ABSL_GUARDED_BY(mutex_);
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};
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} // namespace connections
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} // namespace nearby
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} // namespace location
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#endif // CORE_INTERNAL_MEDIUMS_BLE_V2_H_
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