franka_combinable_hw.h

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// Copyright (c) 2019 Franka Emika GmbH
// Use of this source code is governed by the Apache-2.0 license, see LICENSE
#pragma once
 
#include <atomic>
#include <functional>
#include <memory>
#include <string>
#include <thread>
 
#include <franka/exception.h>
#include <franka/robot_state.h>
 
#include <actionlib/server/simple_action_server.h>
#include <franka_hw/franka_hw.h>
#include <franka_hw/services.h>
#include <franka_msgs/ErrorRecoveryAction.h>
#include <ros/ros.h>
 
namespace franka_hw {
 
class FrankaCombinableHW : public FrankaHW {
 public:
  FrankaCombinableHW();
 
  /*
   * Initializes the hardware class. That includes parsing parameters, connecting to the robot,
   * setting up ros_control interfaces ans ROS services and actions.
   *
   * @param[in] root_nh A node handle in the root namespace of the control node.
   * @param[in] robot_hw_nh A node handle in the namespace of the robot hardware.
   * @return True if successful, false otherwise.
   */
  bool init(ros::NodeHandle& root_nh, ros::NodeHandle& robot_hw_nh) override;
 
  void initROSInterfaces(ros::NodeHandle& robot_hw_nh) override;
 
  void connect() override;
 
  bool disconnect() override;
 
  void control(const std::function<bool(const ros::Time&, const ros::Duration&)>&
                   ros_callback =  // NOLINT (google-default-arguments)
               [](const ros::Time&, const ros::Duration&) {
                 return true;
               }) override;  // NOLINT (google-default-arguments)
 
  bool checkForConflict(const std::list<hardware_interface::ControllerInfo>& info) const override;
 
  void read(const ros::Time& /*time*/, const ros::Duration& /*period*/) override;
 
  void write(const ros::Time& /*time*/, const ros::Duration& period) override;
 
  std::string getArmID() const noexcept;
 
  void triggerError();
 
  bool hasError() const noexcept;
 
  void resetError();
 
  bool controllerNeedsReset() const noexcept;
 
 private:
  template <typename T>
  T libfrankaUpdateCallback(const T& command,
                            const franka::RobotState& robot_state,
                            franka::Duration time_step) {
    if (commandHasNaN(command)) {
      std::string error_message = "FrankaCombinableHW: Got NaN value in command!";
      ROS_FATAL("%s", error_message.c_str());
      throw std::invalid_argument(error_message);
    }
    checkJointLimits();
    {
      std::lock_guard<std::mutex> state_lock(libfranka_state_mutex_);
      robot_state_libfranka_ = robot_state;
    }
 
    std::lock_guard<std::mutex> command_lock(libfranka_cmd_mutex_);
    T current_cmd = command;
    if (has_error_ || !controller_active_) {
      return franka::MotionFinished(current_cmd);
    }
    return current_cmd;
  }
 
  void publishErrorState(bool error);
 
  void setupServicesAndActionServers(ros::NodeHandle& node_handle);
 
  void initRobot() override;
 
  bool setRunFunction(const ControlMode& requested_control_mode,
                      bool limit_rate,
                      double cutoff_frequency,
                      franka::ControllerMode internal_controller) override;
 
  void controlLoop();
 
  std::unique_ptr<std::thread> control_loop_thread_;
  std::unique_ptr<ServiceContainer> services_;
  std::unique_ptr<actionlib::SimpleActionServer<franka_msgs::ErrorRecoveryAction>>
      recovery_action_server_;
  std::atomic_bool has_error_{false};
  ros::Publisher has_error_pub_;
  std::atomic_bool error_recovered_{false};
  std::atomic_bool controller_needs_reset_{false};
  ros::NodeHandle robot_hw_nh_;
};
 
}  // namespace franka_hw