fix_start_state_path_constraints.cpp

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/* Author: Ioan Sucan */
 
#include <moveit/planning_request_adapter/planning_request_adapter.h>
#include <moveit/robot_state/conversions.h>
#include <class_loader/class_loader.hpp>
#include <moveit/trajectory_processing/trajectory_tools.h>
#include <ros/ros.h>
 
namespace default_planner_request_adapters
{
class FixStartStatePathConstraints : public planning_request_adapter::PlanningRequestAdapter
{
public:
  FixStartStatePathConstraints() : planning_request_adapter::PlanningRequestAdapter()
  {
  }
 
  void initialize(const ros::NodeHandle& /*nh*/) override
  {
  }
 
  std::string getDescription() const override
  {
    return "Fix Start State Path Constraints";
  }
 
  bool adaptAndPlan(const PlannerFn& planner, const planning_scene::PlanningSceneConstPtr& planning_scene,
                    const planning_interface::MotionPlanRequest& req, planning_interface::MotionPlanResponse& res,
                    std::vector<std::size_t>& added_path_index) const override
  {
    ROS_DEBUG("Running '%s'", getDescription().c_str());
 
    // get the specified start state
    moveit::core::RobotState start_state = planning_scene->getCurrentState();
    moveit::core::robotStateMsgToRobotState(planning_scene->getTransforms(), req.start_state, start_state);
 
    // if the start state is otherwise valid but does not meet path constraints
    if (planning_scene->isStateValid(start_state, req.group_name) &&
        !planning_scene->isStateValid(start_state, req.path_constraints, req.group_name))
    {
      ROS_INFO("Path constraints not satisfied for start state...");
      planning_scene->isStateValid(start_state, req.path_constraints, req.group_name, true);
      ROS_INFO("Planning to path constraints...");
 
      planning_interface::MotionPlanRequest req2 = req;
      req2.goal_constraints.resize(1);
      req2.goal_constraints[0] = req.path_constraints;
      req2.path_constraints = moveit_msgs::Constraints();
      planning_interface::MotionPlanResponse res2;
      // we call the planner for this additional request, but we do not want to include potential
      // index information from that call
      std::vector<std::size_t> added_path_index_temp;
      added_path_index_temp.swap(added_path_index);
      bool solved1 = planner(planning_scene, req2, res2);
      added_path_index_temp.swap(added_path_index);
 
      if (solved1)
      {
        planning_interface::MotionPlanRequest req3 = req;
        ROS_INFO("Planned to path constraints. Resuming original planning request.");
 
        // extract the last state of the computed motion plan and set it as the new start state
        moveit::core::robotStateToRobotStateMsg(res2.trajectory_->getLastWayPoint(), req3.start_state);
        bool solved2 = planner(planning_scene, req3, res);
        res.planning_time_ += res2.planning_time_;
 
        if (solved2)
        {
          // since we add a prefix, we need to correct any existing index positions
          for (std::size_t& added_index : added_path_index)
            added_index += res2.trajectory_->getWayPointCount();
 
          // we mark the fact we insert a prefix path (we specify the index position we just added)
          for (std::size_t i = 0; i < res2.trajectory_->getWayPointCount(); ++i)
            added_path_index.push_back(i);
 
          // we need to append the solution paths.
          res2.trajectory_->append(*res.trajectory_, 0.0);
          res2.trajectory_->swap(*res.trajectory_);
          return true;
        }
        else
          return false;
      }
      else
      {
        ROS_WARN("Unable to plan to path constraints.");
        res.error_code_.val = moveit_msgs::MoveItErrorCodes::START_STATE_VIOLATES_PATH_CONSTRAINTS;
        res.planning_time_ = res2.planning_time_;
        return false;
      }
    }
    else
    {
      ROS_DEBUG("Path constraints are OK. Running usual motion plan.");
      return planner(planning_scene, req, res);
    }
  }
};
}  // namespace default_planner_request_adapters
 
CLASS_LOADER_REGISTER_CLASS(default_planner_request_adapters::FixStartStatePathConstraints,
                            planning_request_adapter::PlanningRequestAdapter);