cartesian_path_service_capability.cpp

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/* Author: Ioan Sucan */

#include "cartesian_path_service_capability.h"
#include <moveit/robot_state/conversions.h>
#include <moveit/kinematic_constraints/utils.h>
#include <moveit/collision_detection/collision_tools.h>
#include <eigen_conversions/eigen_msg.h>
#include <moveit/move_group/capability_names.h>
#include <moveit/planning_pipeline/planning_pipeline.h>
#include <moveit_msgs/DisplayTrajectory.h>

move_group::MoveGroupCartesianPathService::MoveGroupCartesianPathService() :
  MoveGroupCapability("CartesianPathService"),
  display_computed_paths_(true)
{
}

void move_group::MoveGroupCartesianPathService::initialize()
{
  display_path_ = node_handle_.advertise<moveit_msgs::DisplayTrajectory>(planning_pipeline::PlanningPipeline::DISPLAY_PATH_TOPIC, 10, true);
  cartesian_path_service_ = root_node_handle_.advertiseService(CARTESIAN_PATH_SERVICE_NAME, &MoveGroupCartesianPathService::computeService, this);
}

namespace
{
bool isStateValid(const planning_scene::PlanningScene *planning_scene,
                  const kinematic_constraints::KinematicConstraintSet *constraint_set,
                  robot_state::RobotState *state,
                  const robot_state::JointModelGroup *group, const double *ik_solution)
{
  state->setJointGroupPositions(group, ik_solution);
  state->update();
  return (!planning_scene || !planning_scene->isStateColliding(*state, group->getName())) &&
    (!constraint_set || constraint_set->decide(*state).satisfied);
}
}

bool move_group::MoveGroupCartesianPathService::computeService(moveit_msgs::GetCartesianPath::Request &req, moveit_msgs::GetCartesianPath::Response &res)
{
  ROS_INFO("Received request to compute Cartesian path");
  context_->planning_scene_monitor_->updateFrameTransforms();

  robot_state::RobotState start_state = planning_scene_monitor::LockedPlanningSceneRO(context_->planning_scene_monitor_)->getCurrentState();
  robot_state::robotStateMsgToRobotState(req.start_state, start_state);
  if (const robot_model::JointModelGroup *jmg = start_state.getJointModelGroup(req.group_name))
  {
    std::string link_name = req.link_name;
    if (link_name.empty() && !jmg->getLinkModelNames().empty())
      link_name = jmg->getLinkModelNames().back();

    bool ok = true;
    EigenSTL::vector_Affine3d waypoints(req.waypoints.size());
    const std::string &default_frame = context_->planning_scene_monitor_->getRobotModel()->getModelFrame();
    bool no_transform = req.header.frame_id.empty() || robot_state::Transforms::sameFrame(req.header.frame_id, default_frame) ||
      robot_state::Transforms::sameFrame(req.header.frame_id, link_name);
    
    for (std::size_t i = 0 ; i < req.waypoints.size() ; ++i)
    {
      if (no_transform)
        tf::poseMsgToEigen(req.waypoints[i], waypoints[i]);
      else
      {
        geometry_msgs::PoseStamped p;
        p.header = req.header;
        p.pose = req.waypoints[i];
        if (performTransform(p, default_frame))
          tf::poseMsgToEigen(p.pose, waypoints[i]);
        else
        {
          ROS_ERROR("Error encountered transforming waypoints to frame '%s'", default_frame.c_str());
          ok = false;
          break;
        }
      }
    }
    
    if (ok)
    {
      if (req.max_step < std::numeric_limits<double>::epsilon())
      {
        ROS_ERROR("Maximum step to take between consecutive configrations along Cartesian path was not specified (this value needs to be > 0)");
        res.error_code.val = moveit_msgs::MoveItErrorCodes::FAILURE;
      }
      else
      {
        if (waypoints.size() > 0)
        {
          robot_state::GroupStateValidityCallbackFn constraint_fn;
          boost::scoped_ptr<planning_scene_monitor::LockedPlanningSceneRO> ls;
          boost::scoped_ptr<kinematic_constraints::KinematicConstraintSet> kset;
          if (req.avoid_collisions || !kinematic_constraints::isEmpty(req.path_constraints))
          {
            ls.reset(new planning_scene_monitor::LockedPlanningSceneRO(context_->planning_scene_monitor_));
            kset.reset(new kinematic_constraints::KinematicConstraintSet((*ls)->getRobotModel()));
            kset->add(req.path_constraints, (*ls)->getTransforms());
            constraint_fn = boost::bind(&isStateValid, req.avoid_collisions ? static_cast<const planning_scene::PlanningSceneConstPtr&>(*ls).get() : NULL, kset->empty() ? NULL : kset.get(), _1, _2, _3);
          }
          bool global_frame = !robot_state::Transforms::sameFrame(link_name, req.header.frame_id);
          ROS_INFO("Attempting to follow %u waypoints for link '%s' using a step of %lf m and jump threshold %lf (in %s reference frame)",
                   (unsigned int)waypoints.size(), link_name.c_str(), req.max_step, req.jump_threshold, global_frame ? "global" : "link");
          std::vector<robot_state::RobotStatePtr> traj;
          res.fraction = start_state.computeCartesianPath(jmg, traj, start_state.getLinkModel(link_name), waypoints, global_frame, req.max_step, req.jump_threshold, constraint_fn);
          robot_state::robotStateToRobotStateMsg(start_state, res.start_state);
          
          robot_trajectory::RobotTrajectory rt(context_->planning_scene_monitor_->getRobotModel(), req.group_name);
          for (std::size_t i = 0 ; i < traj.size() ; ++i)
            rt.addSuffixWayPoint(traj[i], 0.2); // \todo make 0.2 a param; better: compute time stemps based on eef distance and param m/s speed for eef;
          rt.getRobotTrajectoryMsg(res.solution);
          ROS_INFO("Computed Cartesian path with %u points (followed %lf%% of requested trajectory)", (unsigned int)traj.size(), res.fraction * 100.0);
          if (display_computed_paths_ && rt.getWayPointCount() > 0)
          {
            moveit_msgs::DisplayTrajectory disp;
            disp.model_id = context_->planning_scene_monitor_->getRobotModel()->getName();
            disp.trajectory.resize(1, res.solution);
            robot_state::robotStateToRobotStateMsg(rt.getFirstWayPoint(), disp.trajectory_start);
            display_path_.publish(disp);
          }
        }
        res.error_code.val = moveit_msgs::MoveItErrorCodes::SUCCESS;
      }
    }
    else
      res.error_code.val = moveit_msgs::MoveItErrorCodes::FRAME_TRANSFORM_FAILURE;
  }
  else
    res.error_code.val = moveit_msgs::MoveItErrorCodes::INVALID_GROUP_NAME;
  
  return true;
}

#include <class_loader/class_loader.h>
CLASS_LOADER_REGISTER_CLASS(move_group::MoveGroupCartesianPathService, move_group::MoveGroupCapability)