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/utils/message_checks.h>
#include <moveit/collision_detection/collision_tools.h>
#include <tf2_eigen/tf2_eigen.h>
#include <moveit/move_group/capability_names.h>
#include <moveit/planning_pipeline/planning_pipeline.h>
#include <moveit/robot_state/robot_state.h>
#include <moveit/robot_state/cartesian_interpolator.h>
#include <moveit_msgs/DisplayTrajectory.h>
#include <moveit/trajectory_processing/iterative_time_parameterization.h>
#include <moveit/trajectory_processing/limit_cartesian_speed.h>
 
namespace
{
bool isStateValid(const planning_scene::PlanningScene* planning_scene,
                  const kinematic_constraints::KinematicConstraintSet* constraint_set, moveit::core::RobotState* state,
                  const moveit::core::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);
}
}  // namespace
 
namespace move_group
{
MoveGroupCartesianPathService::MoveGroupCartesianPathService()
  : MoveGroupCapability("CartesianPathService"), display_computed_paths_(true)
{
}
 
void 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);
}
 
bool MoveGroupCartesianPathService::computeService(moveit_msgs::GetCartesianPath::Request& req,
                                                   moveit_msgs::GetCartesianPath::Response& res)
{
  ROS_INFO_NAMED(getName(), "Received request to compute Cartesian path");
  context_->planning_scene_monitor_->updateFrameTransforms();
 
  moveit::core::RobotState start_state =
      planning_scene_monitor::LockedPlanningSceneRO(context_->planning_scene_monitor_)->getCurrentState();
  moveit::core::robotStateMsgToRobotState(req.start_state, start_state);
  if (const moveit::core::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_Isometry3d waypoints(req.waypoints.size());
    const std::string& default_frame = context_->planning_scene_monitor_->getRobotModel()->getModelFrame();
    bool no_transform = req.header.frame_id.empty() ||
                        moveit::core::Transforms::sameFrame(req.header.frame_id, default_frame) ||
                        moveit::core::Transforms::sameFrame(req.header.frame_id, link_name);
 
    for (std::size_t i = 0; i < req.waypoints.size(); ++i)
    {
      if (no_transform)
        tf2::fromMsg(req.waypoints[i], waypoints[i]);
      else
      {
        geometry_msgs::PoseStamped p;
        p.header = req.header;
        p.pose = req.waypoints[i];
        if (performTransform(p, default_frame))
          tf2::fromMsg(p.pose, waypoints[i]);
        else
        {
          ROS_ERROR_NAMED(getName(), "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_NAMED(getName(), "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.empty())
        {
          moveit::core::GroupStateValidityCallbackFn constraint_fn;
          std::unique_ptr<planning_scene_monitor::LockedPlanningSceneRO> ls;
          std::unique_ptr<kinematic_constraints::KinematicConstraintSet> kset;
          if (req.avoid_collisions || !moveit::core::isEmpty(req.path_constraints))
          {
            ls = std::make_unique<planning_scene_monitor::LockedPlanningSceneRO>(context_->planning_scene_monitor_);
            kset = std::make_unique<kinematic_constraints::KinematicConstraintSet>((*ls)->getRobotModel());
            kset->add(req.path_constraints, (*ls)->getTransforms());
            constraint_fn = [scene = req.avoid_collisions ?
                                         static_cast<const planning_scene::PlanningSceneConstPtr&>(*ls).get() :
                                         nullptr,
                             kset_ptr = kset.get()](moveit::core::RobotState* robot_state,
                                                    const moveit::core::JointModelGroup* joint_group,
                                                    const double* joint_group_variable_values) {
              return isStateValid(scene, kset_ptr, robot_state, joint_group, joint_group_variable_values);
            };
          }
          // resolve link_name
          bool global_frame = !moveit::core::Transforms::sameFrame(link_name, req.header.frame_id);
          const moveit::core::LinkModel* link_model = nullptr;
          bool found = false;
          const Eigen::Isometry3d frame_pose = start_state.getFrameInfo(link_name, link_model, found);
          if (!found)
          {
            ROS_ERROR_STREAM_NAMED(getName(), "Unknown frame: " << link_name);
            res.error_code.val = moveit_msgs::MoveItErrorCodes::FAILURE;
          }
          ROS_INFO_NAMED(getName(),
                         "Attempting to follow %u waypoints for link '%s' using a step of %lf m "
                         "(in %s reference frame)",
                         (unsigned int)waypoints.size(), link_name.c_str(), req.max_step,
                         global_frame ? "global" : "link");
 
          std::vector<moveit::core::RobotStatePtr> traj;
          res.fraction = moveit::core::CartesianInterpolator::computeCartesianPath(
              &start_state, jmg, traj, link_model, waypoints, global_frame, moveit::core::MaxEEFStep(req.max_step),
              moveit::core::CartesianPrecision{}, constraint_fn, kinematics::KinematicsQueryOptions(),
              start_state.getGlobalLinkTransform(link_model).inverse() * frame_pose);
          moveit::core::robotStateToRobotStateMsg(start_state, res.start_state);
 
          robot_trajectory::RobotTrajectory rt(context_->planning_scene_monitor_->getRobotModel(), req.group_name);
          for (const moveit::core::RobotStatePtr& traj_state : traj)
            rt.addSuffixWayPoint(traj_state, 0.0);
 
          // time trajectory
          trajectory_processing::IterativeParabolicTimeParameterization time_param;
          time_param.computeTimeStamps(rt, 1.0);
 
          // optionally compute timing to move the eef with constant speed
          if (req.max_cartesian_speed > 0.0)
          {
            trajectory_processing::limitMaxCartesianLinkSpeed(rt, req.max_cartesian_speed,
                                                              req.cartesian_speed_limited_link);
          }
 
          rt.getRobotTrajectoryMsg(res.solution);
          ROS_INFO_NAMED(getName(), "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);
            moveit::core::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;
}
 
}  // namespace move_group
 
#include <class_loader/class_loader.hpp>
CLASS_LOADER_REGISTER_CLASS(move_group::MoveGroupCartesianPathService, move_group::MoveGroupCapability)