single_thread_locomotor.cpp

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#include <locomotor/locomotor.h>
#include <locomotor/locomotor_action_server.h>
#include <nav_2d_utils/conversions.h>
#include <string>
 
namespace locomotor
{
using nav_core2::getResultCode;
 
class SingleThreadLocomotor
{
public:
  explicit SingleThreadLocomotor(const ros::NodeHandle& private_nh)
    : private_nh_(private_nh), locomotor_(private_nh_), main_ex_(private_nh_, false),
      as_(private_nh_, std::bind(&SingleThreadLocomotor::setGoal, this, std::placeholders::_1))
  {
    private_nh_.param("controller_frequency", controller_frequency_, controller_frequency_);
    desired_control_duration_ = ros::Duration(1.0 / controller_frequency_);
    control_loop_timer_ = private_nh_.createTimer(desired_control_duration_,
                                                  &SingleThreadLocomotor::controlLoopCallback,
                                                  this, false, false);  // one_shot=false(default), auto_start=false
    locomotor_.initializeGlobalCostmap(main_ex_);
    locomotor_.initializeGlobalPlanners(main_ex_);
    locomotor_.initializeLocalCostmap(main_ex_);
    locomotor_.initializeLocalPlanners(main_ex_);
  }
 
  void setGoal(nav_2d_msgs::Pose2DStamped goal)
  {
    locomotor_.setGoal(goal);
    locomotor_.requestGlobalCostmapUpdate(main_ex_, main_ex_,
      std::bind(&SingleThreadLocomotor::onGlobalCostmapUpdate, this, std::placeholders::_1),
      std::bind(&SingleThreadLocomotor::onGlobalCostmapException, this, std::placeholders::_1, std::placeholders::_2));
  }
 
protected:
  void requestGlobalCostmapUpdate()
  {
    locomotor_.requestGlobalCostmapUpdate(main_ex_, main_ex_,
      std::bind(&SingleThreadLocomotor::onGlobalCostmapUpdate, this, std::placeholders::_1),
      std::bind(&SingleThreadLocomotor::onGlobalCostmapException, this, std::placeholders::_1, std::placeholders::_2));
  }
 
  void requestNavigationFailure(const locomotor_msgs::ResultCode& result)
  {
    locomotor_.requestNavigationFailure(main_ex_, result,
      std::bind(&SingleThreadLocomotor::onNavigationFailure, this, std::placeholders::_1));
  }
 
  // Locomotor Callbacks
  void onGlobalCostmapUpdate(const ros::Duration& planning_time)
  {
    locomotor_.requestGlobalPlan(main_ex_, main_ex_,
      std::bind(&SingleThreadLocomotor::onNewGlobalPlan, this, std::placeholders::_1, std::placeholders::_2),
      std::bind(&SingleThreadLocomotor::onGlobalPlanningException, this, std::placeholders::_1, std::placeholders::_2));
  }
 
  void onGlobalCostmapException(nav_core2::NavCore2ExceptionPtr e_ptr, const ros::Duration& planning_time)
  {
    requestNavigationFailure(makeResultCode(locomotor_msgs::ResultCode::GLOBAL_COSTMAP, getResultCode(e_ptr),
                                            "Global Costmap failure."));
  }
 
  void onNewGlobalPlan(nav_2d_msgs::Path2D new_global_plan, const ros::Duration& planning_time)
  {
    locomotor_.publishPath(new_global_plan);
    locomotor_.getCurrentLocalPlanner().setPlan(new_global_plan);
    control_loop_timer_.start();
    as_.publishFeedback(locomotor_.getNavigationState());
  }
 
  void onGlobalPlanningException(nav_core2::NavCore2ExceptionPtr e_ptr, const ros::Duration& planning_time)
  {
    ROS_ERROR_NAMED("Locomotor", "Global planning error. Giving up.");
    requestNavigationFailure(makeResultCode(locomotor_msgs::ResultCode::GLOBAL_PLANNER, getResultCode(e_ptr),
                                            "Global Planning Failure."));
  }
 
  void controlLoopCallback(const ros::TimerEvent& event)
  {
    locomotor_.requestLocalCostmapUpdate(main_ex_, main_ex_,
      std::bind(&SingleThreadLocomotor::onLocalCostmapUpdate, this, std::placeholders::_1),
      std::bind(&SingleThreadLocomotor::onLocalCostmapException, this, std::placeholders::_1, std::placeholders::_2));
  }
 
  void onLocalCostmapUpdate(const ros::Duration& planning_time)
  {
    locomotor_.requestLocalPlan(main_ex_, main_ex_,
      std::bind(&SingleThreadLocomotor::onNewLocalPlan, this, std::placeholders::_1, std::placeholders::_2),
      std::bind(&SingleThreadLocomotor::onLocalPlanningException, this, std::placeholders::_1, std::placeholders::_2),
      std::bind(&SingleThreadLocomotor::onNavigationCompleted, this));
  }
 
  void onLocalCostmapException(nav_core2::NavCore2ExceptionPtr e_ptr, const ros::Duration& planning_time)
  {
    requestNavigationFailure(makeResultCode(locomotor_msgs::ResultCode::LOCAL_COSTMAP, getResultCode(e_ptr),
                                            "Local Costmap failure."));
  }
 
  void onNewLocalPlan(nav_2d_msgs::Twist2DStamped new_command, const ros::Duration& planning_time)
  {
    locomotor_.publishTwist(new_command);
    if (planning_time > desired_control_duration_)
    {
      ROS_WARN_NAMED("locomotor", "Control loop missed its desired rate of %.4fHz... "
                     "the loop actually took %.4f seconds (>%.4f).",
                     controller_frequency_, planning_time.toSec(), desired_control_duration_.toSec());
    }
    as_.publishFeedback(locomotor_.getNavigationState());
  }
 
  void onLocalPlanningException(nav_core2::NavCore2ExceptionPtr e_ptr, const ros::Duration& planning_time)
  {
    ROS_WARN_NAMED("Locomotor", "Local planning error. Creating new global plan.");
    control_loop_timer_.stop();
    requestGlobalCostmapUpdate();
  }
 
  void onNavigationCompleted()
  {
    ROS_INFO_NAMED("Locomotor", "Plan completed! Stopping.");
    control_loop_timer_.stop();
    as_.completeNavigation();
  }
 
  void onNavigationFailure(const locomotor_msgs::ResultCode result)
  {
    control_loop_timer_.stop();
    as_.failNavigation(result);
  }
 
  ros::NodeHandle private_nh_;
  // Locomotor Object
  Locomotor locomotor_;
 
  // Timer Stuff
  double controller_frequency_ { 20.0 };
  ros::Duration desired_control_duration_;
  ros::Timer control_loop_timer_;
 
  // Main Executor using Global CallbackQueue
  Executor main_ex_;
 
  // Action Server
  LocomotorActionServer as_;
};
};  // namespace locomotor
 
int main(int argc, char** argv)
{
  ros::init(argc, argv, "locomotor_node");
  ros::NodeHandle nh("~");
  locomotor::SingleThreadLocomotor sm(nh);
  ros::spin();
  return 0;
}