kinematics_service_capability.cpp

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/* Author: Ioan Sucan */
 
#include "kinematics_service_capability.h"
#include <moveit/robot_state/conversions.h>
#include <moveit/utils/message_checks.h>
#include <tf2_eigen/tf2_eigen.h>
#include <moveit/move_group/capability_names.h>
 
namespace move_group
{
MoveGroupKinematicsService::MoveGroupKinematicsService() : MoveGroupCapability("KinematicsService")
{
}
 
void MoveGroupKinematicsService::initialize()
{
  fk_service_ =
      root_node_handle_.advertiseService(FK_SERVICE_NAME, &MoveGroupKinematicsService::computeFKService, this);
  ik_service_ =
      root_node_handle_.advertiseService(IK_SERVICE_NAME, &MoveGroupKinematicsService::computeIKService, this);
}
 
namespace
{
bool isIKSolutionValid(const planning_scene::PlanningScene* planning_scene,
                       const kinematic_constraints::KinematicConstraintSet* constraint_set,
                       moveit::core::RobotState* state, const moveit::core::JointModelGroup* jmg,
                       const double* ik_solution)
{
  state->setJointGroupPositions(jmg, ik_solution);
  state->update();
  return (!planning_scene || !planning_scene->isStateColliding(*state, jmg->getName())) &&
         (!constraint_set || constraint_set->decide(*state).satisfied);
}
}  // namespace
 
void MoveGroupKinematicsService::computeIK(moveit_msgs::PositionIKRequest& req, moveit_msgs::RobotState& solution,
                                           moveit_msgs::MoveItErrorCodes& error_code, moveit::core::RobotState& rs,
                                           const moveit::core::GroupStateValidityCallbackFn& constraint) const
{
  const moveit::core::JointModelGroup* jmg = rs.getJointModelGroup(req.group_name);
  if (jmg)
  {
    if (!moveit::core::isEmpty(req.robot_state))
    {
      moveit::core::robotStateMsgToRobotState(req.robot_state, rs);
    }
    const std::string& default_frame = context_->planning_scene_monitor_->getRobotModel()->getModelFrame();
 
    if (req.pose_stamped_vector.empty() || req.pose_stamped_vector.size() == 1)
    {
      geometry_msgs::PoseStamped req_pose =
          req.pose_stamped_vector.empty() ? req.pose_stamped : req.pose_stamped_vector[0];
      std::string ik_link = (!req.pose_stamped_vector.empty()) ?
                                (req.ik_link_names.empty() ? "" : req.ik_link_names[0]) :
                                req.ik_link_name;
 
      if (performTransform(req_pose, default_frame))
      {
        bool result_ik = false;
        if (ik_link.empty())
          result_ik = rs.setFromIK(jmg, req_pose.pose, req.timeout.toSec(), constraint);
        else
          result_ik = rs.setFromIK(jmg, req_pose.pose, ik_link, req.timeout.toSec(), constraint);
 
        if (result_ik)
        {
          moveit::core::robotStateToRobotStateMsg(rs, solution, false);
          error_code.val = moveit_msgs::MoveItErrorCodes::SUCCESS;
        }
        else
          error_code.val = moveit_msgs::MoveItErrorCodes::NO_IK_SOLUTION;
      }
      else
        error_code.val = moveit_msgs::MoveItErrorCodes::FRAME_TRANSFORM_FAILURE;
    }
    else
    {
      if (req.pose_stamped_vector.size() != req.ik_link_names.size())
        error_code.val = moveit_msgs::MoveItErrorCodes::INVALID_LINK_NAME;
      else
      {
        bool ok = true;
        EigenSTL::vector_Isometry3d req_poses(req.pose_stamped_vector.size());
        for (std::size_t k = 0; k < req.pose_stamped_vector.size(); ++k)
        {
          geometry_msgs::PoseStamped msg = req.pose_stamped_vector[k];
          if (performTransform(msg, default_frame))
            tf2::fromMsg(msg.pose, req_poses[k]);
          else
          {
            error_code.val = moveit_msgs::MoveItErrorCodes::FRAME_TRANSFORM_FAILURE;
            ok = false;
            break;
          }
        }
        if (ok)
        {
          if (rs.setFromIK(jmg, req_poses, req.ik_link_names, req.timeout.toSec(), constraint))
          {
            moveit::core::robotStateToRobotStateMsg(rs, solution, false);
            error_code.val = moveit_msgs::MoveItErrorCodes::SUCCESS;
          }
          else
            error_code.val = moveit_msgs::MoveItErrorCodes::NO_IK_SOLUTION;
        }
      }
    }
  }
  else
    error_code.val = moveit_msgs::MoveItErrorCodes::INVALID_GROUP_NAME;
}
 
bool MoveGroupKinematicsService::computeIKService(moveit_msgs::GetPositionIK::Request& req,
                                                  moveit_msgs::GetPositionIK::Response& res)
{
  context_->planning_scene_monitor_->updateFrameTransforms();
 
  // check if the planning scene needs to be kept locked; if so, call computeIK() in the scope of the lock
  if (req.ik_request.avoid_collisions || !moveit::core::isEmpty(req.ik_request.constraints))
  {
    planning_scene_monitor::LockedPlanningSceneRO ls(context_->planning_scene_monitor_);
    kinematic_constraints::KinematicConstraintSet kset(ls->getRobotModel());
    moveit::core::RobotState rs = ls->getCurrentState();
    kset.add(req.ik_request.constraints, ls->getTransforms());
    computeIK(req.ik_request, res.solution, res.error_code, rs,
              [scene = req.ik_request.avoid_collisions ?
                           static_cast<const planning_scene::PlanningSceneConstPtr&>(ls).get() :
                           nullptr,
               kset_ptr = kset.empty() ? nullptr : &kset](moveit::core::RobotState* robot_state,
                                                          const moveit::core::JointModelGroup* joint_group,
                                                          const double* joint_group_variable_values) {
                return isIKSolutionValid(scene, kset_ptr, robot_state, joint_group, joint_group_variable_values);
              });
  }
  else
  {
    // compute unconstrained IK, no lock to planning scene maintained
    moveit::core::RobotState rs =
        planning_scene_monitor::LockedPlanningSceneRO(context_->planning_scene_monitor_)->getCurrentState();
    computeIK(req.ik_request, res.solution, res.error_code, rs);
  }
 
  return true;
}
 
bool MoveGroupKinematicsService::computeFKService(moveit_msgs::GetPositionFK::Request& req,
                                                  moveit_msgs::GetPositionFK::Response& res)
{
  if (req.fk_link_names.empty())
  {
    ROS_ERROR_NAMED(getName(), "No links specified for FK request");
    res.error_code.val = moveit_msgs::MoveItErrorCodes::INVALID_LINK_NAME;
    return true;
  }
 
  context_->planning_scene_monitor_->updateFrameTransforms();
 
  const std::string& default_frame = context_->planning_scene_monitor_->getRobotModel()->getModelFrame();
  bool do_transform = !req.header.frame_id.empty() &&
                      !moveit::core::Transforms::sameFrame(req.header.frame_id, default_frame) &&
                      context_->planning_scene_monitor_->getTFClient();
  bool tf_problem = false;
 
  moveit::core::RobotState rs =
      planning_scene_monitor::LockedPlanningSceneRO(context_->planning_scene_monitor_)->getCurrentState();
  moveit::core::robotStateMsgToRobotState(req.robot_state, rs);
  for (std::size_t i = 0; i < req.fk_link_names.size(); ++i)
    if (rs.getRobotModel()->hasLinkModel(req.fk_link_names[i]))
    {
      res.pose_stamped.resize(res.pose_stamped.size() + 1);
      res.pose_stamped.back().pose = tf2::toMsg(rs.getGlobalLinkTransform(req.fk_link_names[i]));
      res.pose_stamped.back().header.frame_id = default_frame;
      res.pose_stamped.back().header.stamp = ros::Time::now();
      if (do_transform)
        if (!performTransform(res.pose_stamped.back(), req.header.frame_id))
          tf_problem = true;
      res.fk_link_names.push_back(req.fk_link_names[i]);
    }
  if (tf_problem)
    res.error_code.val = moveit_msgs::MoveItErrorCodes::FRAME_TRANSFORM_FAILURE;
  else if (res.fk_link_names.size() == req.fk_link_names.size())
    res.error_code.val = moveit_msgs::MoveItErrorCodes::SUCCESS;
  else
    res.error_code.val = moveit_msgs::MoveItErrorCodes::INVALID_LINK_NAME;
  return true;
}
}  // namespace move_group
 
#include <class_loader/class_loader.hpp>
CLASS_LOADER_REGISTER_CLASS(move_group::MoveGroupKinematicsService, move_group::MoveGroupCapability)