mode_executor.hpp

/****************************************************************************
 * Copyright (c) 2023 PX4 Development Team.
 * SPDX-License-Identifier: BSD-3-Clause
 ****************************************************************************/
 
#pragma once
 
#include "mode.hpp"
#include "overrides.hpp"
 
#include <rclcpp/rclcpp.hpp>
#include <px4_msgs/msg/vehicle_status.hpp>
#include <px4_msgs/msg/vehicle_command.hpp>
#include <px4_msgs/msg/vehicle_command_ack.hpp>
#include <px4_msgs/msg/mode_completed.hpp>
 
#include <functional>
 
class Registration;
 
namespace px4_ros2
{
class ModeExecutorBase
{
public:
  using CompletedCallback = std::function<void (Result)>;
 
  struct Settings
  {
    enum class Activation
    {
      ActivateOnlyWhenArmed, 
      ActivateAlways, 
      ActivateImmediately, 
    };
    Activation activation{Activation::ActivateOnlyWhenArmed};
  };
 
  enum class DeactivateReason
  {
    FailsafeActivated,
    Other
  };
 
  ModeExecutorBase(
    rclcpp::Node & node, const Settings & settings, ModeBase & owned_mode,
    const std::string & topic_namespace_prefix = "");
  ModeExecutorBase(const ModeExecutorBase &) = delete;
  virtual ~ModeExecutorBase() = default;
 
  bool doRegister();
 
 
  virtual void onActivate() = 0;
 
  virtual void onDeactivate(DeactivateReason reason) = 0;
 
  virtual void onFailsafeDeferred() {}
 
  Result sendCommandSync(
    uint32_t command, float param1 = NAN, float param2 = NAN, float param3 = NAN,
    float param4 = NAN,
    float param5 = NAN, float param6 = NAN, float param7 = NAN);
 
  void scheduleMode(
    ModeBase::ModeID mode_id, const CompletedCallback & on_completed,
    bool forced = false);
 
  void takeoff(const CompletedCallback & on_completed, float altitude = NAN, float heading = NAN);
  void land(const CompletedCallback & on_completed);
  void rtl(const CompletedCallback & on_completed);
 
  void arm(const CompletedCallback & on_completed, bool run_preflight_checks = true);
  void disarm(const CompletedCallback & on_completed, bool forced = false);
  void waitReadyToArm(const CompletedCallback & on_completed);
  void waitUntilDisarmed(const CompletedCallback & on_completed);
 
  bool isInCharge() const {return _is_in_charge;}
 
  bool isArmed() const {return _is_armed;}
 
  ModeBase & ownedMode() {return _owned_mode;}
 
  int id() const;
 
  rclcpp::Node & node() {return _node;}
 
  ConfigOverrides & configOverrides() {return _config_overrides;}
 
  bool deferFailsafesSync(bool enabled, int timeout_s = 0);
 
private:
  class ScheduledMode
  {
public:
    ScheduledMode(rclcpp::Node & node, const std::string & topic_namespace_prefix);
 
    bool active() const {return _mode_id != ModeBase::kModeIDInvalid;}
    void activate(ModeBase::ModeID mode_id, const CompletedCallback & on_completed);
    void cancel();
    ModeBase::ModeID modeId() const {return _mode_id;}
 
private:
    void reset() {_mode_id = ModeBase::kModeIDInvalid;}
 
    ModeBase::ModeID _mode_id{ModeBase::kModeIDInvalid};
    CompletedCallback _on_completed_callback;
    rclcpp::Subscription<px4_msgs::msg::ModeCompleted>::SharedPtr _mode_completed_sub;
  };
 
  class WaitForVehicleStatusCondition
  {
public:
    using RunCheckCallback =
      std::function<bool (const px4_msgs::msg::VehicleStatus::UniquePtr & msg)>;
    WaitForVehicleStatusCondition() = default;
 
    bool active() const {return _on_completed_callback != nullptr;}
    void update(const px4_msgs::msg::VehicleStatus::UniquePtr & msg);
 
    void activate(
      const RunCheckCallback & run_check_callback,
      const CompletedCallback & on_completed);
    void cancel();
 
private:
    CompletedCallback _on_completed_callback;
    RunCheckCallback _run_check_callback;
  };
 
  void onRegistered();
 
  void callOnActivate();
  void callOnDeactivate(DeactivateReason reason);
 
  void vehicleStatusUpdated(const px4_msgs::msg::VehicleStatus::UniquePtr & msg);
 
  void scheduleMode(
    ModeBase::ModeID mode_id, const px4_msgs::msg::VehicleCommand & cmd,
    const ModeExecutorBase::CompletedCallback & on_completed, bool forced = false);
 
  rclcpp::Node & _node;
  const std::string _topic_namespace_prefix;
  const Settings _settings;
  ModeBase & _owned_mode;
 
  std::shared_ptr<Registration> _registration;
 
  rclcpp::Subscription<px4_msgs::msg::VehicleStatus>::SharedPtr _vehicle_status_sub;
  rclcpp::Publisher<px4_msgs::msg::VehicleCommand>::SharedPtr _vehicle_command_pub;
 
  ScheduledMode _current_scheduled_mode;
  WaitForVehicleStatusCondition _current_wait_vehicle_status;
 
  bool _is_in_charge{false};
  bool _is_armed{false};
  bool _was_never_activated{true};
  ModeBase::ModeID _prev_nav_state{ModeBase::kModeIDInvalid};
  uint8_t _prev_failsafe_defer_state{px4_msgs::msg::VehicleStatus::FAILSAFE_DEFER_STATE_DISABLED};
 
  ConfigOverrides _config_overrides;
};
 
} // namespace px4_ros2