sensors_handler.h

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/*
 * Copyright (C) 2023 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#pragma once
 
#include <functional>
#include <mutex>
#include <string_view>
#include <unordered_map>
 
#include "cuttlefish/common/libs/sensors/sensors.h"
#include "cuttlefish/common/libs/transport/channel_sharedfd.h"
 
namespace cuttlefish {
namespace webrtc_streaming {
 
class SensorsHandler {
 public:
  using MotionUpdatedCallback = std::function<void(const uint8_t*, size_t)>;
 
  explicit SensorsHandler(SharedFD sensors_fd);
  ~SensorsHandler();
 
  Result<void> SetMotion(double x, double y, double z);
  Result<void> SetHingeAngle(double angle);
 
  int AddMotionUpdatedCallback(MotionUpdatedCallback callback);
  void RemoveMotionUpdatedCallback(int subscriber_id);
 
 private:
  Result<void> SendCommand(uint32_t cmd, std::string_view payload);
  Result<std::string> GetSensorsData(sensors::SensorsMask mask);
  void NotifyMotionUpdated();
 
  std::unordered_map<int, MotionUpdatedCallback> client_channels_;
  int last_client_channel_id_ = -1;
  std::mutex subscribers_mtx_;
  transport::SharedFdChannel channel_;
};
 
}  // namespace webrtc_streaming
}  // namespace cuttlefish