model_based_planning_context.cpp

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/* Author: Ioan Sucan */
 
#include <boost/algorithm/string/trim.hpp>
#include <boost/algorithm/string/split.hpp>
#include <boost/algorithm/string/replace.hpp>
#include <boost/lexical_cast.hpp>
 
#include <moveit/ompl_interface/model_based_planning_context.hpp>
#include <moveit/ompl_interface/detail/state_validity_checker.hpp>
#include <moveit/ompl_interface/detail/constrained_sampler.hpp>
#include <moveit/ompl_interface/detail/constrained_goal_sampler.hpp>
#include <moveit/ompl_interface/detail/goal_union.hpp>
#include <moveit/ompl_interface/detail/projection_evaluators.hpp>
#include <moveit/ompl_interface/detail/constraints_library.hpp>
 
#include <moveit/kinematic_constraints/utils.hpp>
 
#include <moveit/utils/lexical_casts.hpp>
#include <moveit/utils/logger.hpp>
 
#include <ompl/config.h>
#include <ompl/base/samplers/UniformValidStateSampler.h>
#include <ompl/base/goals/GoalLazySamples.h>
#include <ompl/tools/config/SelfConfig.h>
#include <ompl/base/spaces/SE3StateSpace.h>
#include <ompl/datastructures/PDF.h>
#include <ompl/base/terminationconditions/IterationTerminationCondition.h>
#include <ompl/base/terminationconditions/CostConvergenceTerminationCondition.h>
 
#include <ompl/base/objectives/PathLengthOptimizationObjective.h>
#include <ompl/base/objectives/MechanicalWorkOptimizationObjective.h>
#include <ompl/base/objectives/MinimaxObjective.h>
#include <ompl/base/objectives/StateCostIntegralObjective.h>
#include <ompl/base/objectives/MaximizeMinClearanceObjective.h>
#include <ompl/geometric/planners/prm/LazyPRM.h>
 
namespace ompl_interface
{
namespace
{
rclcpp::Logger getLogger()
{
  return moveit::getLogger("moveit.planners.ompl.model_based_planning_context");
}
}  // namespace
 
ModelBasedPlanningContext::ModelBasedPlanningContext(const std::string& name,
                                                     const ModelBasedPlanningContextSpecification& spec)
  : planning_interface::PlanningContext(name, spec.state_space_->getJointModelGroup()->getName())
  , spec_(spec)
  , complete_initial_robot_state_(spec.state_space_->getRobotModel())
  , ompl_simple_setup_(spec.ompl_simple_setup_)
  , ompl_benchmark_(*ompl_simple_setup_)
  , ompl_parallel_plan_(ompl_simple_setup_->getProblemDefinition())
  , ptc_(nullptr)
  , last_plan_time_(0.0)
  , last_simplify_time_(0.0)
  , max_goal_samples_(0)
  , max_state_sampling_attempts_(0)
  , max_goal_sampling_attempts_(0)
  , max_planning_threads_(0)
  , max_solution_segment_length_(0.0)
  , minimum_waypoint_count_(0)
  , multi_query_planning_enabled_(false)  // maintain "old" behavior by default
  , simplify_solutions_(true)
  , interpolate_(true)
  , hybridize_(true)
{
  complete_initial_robot_state_.setToDefaultValues();  // avoid uninitialized memory
  complete_initial_robot_state_.update();
 
  constraints_library_ = std::make_shared<ConstraintsLibrary>(this);
}
 
void ModelBasedPlanningContext::configure(const rclcpp::Node::SharedPtr& node, bool use_constraints_approximations)
{
  loadConstraintApproximations(node);
  if (!use_constraints_approximations)
  {
    setConstraintsApproximations(ConstraintsLibraryPtr());
  }
  complete_initial_robot_state_.update();
  ompl_simple_setup_->getStateSpace()->computeSignature(space_signature_);
  ompl_simple_setup_->getStateSpace()->setStateSamplerAllocator(
      [this](const ompl::base::StateSpace* ss) { return allocPathConstrainedSampler(ss); });
 
  if (spec_.constrained_state_space_)
  {
    // convert the input state to the corresponding OMPL state
    ompl::base::ScopedState<> ompl_start_state(spec_.constrained_state_space_);
    spec_.state_space_->copyToOMPLState(ompl_start_state.get(), getCompleteInitialRobotState());
    ompl_simple_setup_->setStartState(ompl_start_state);
    ompl_simple_setup_->setStateValidityChecker(std::make_shared<ConstrainedPlanningStateValidityChecker>(this));
  }
  else
  {
    // convert the input state to the corresponding OMPL state
    ompl::base::ScopedState<> ompl_start_state(spec_.state_space_);
    spec_.state_space_->copyToOMPLState(ompl_start_state.get(), getCompleteInitialRobotState());
    ompl_simple_setup_->setStartState(ompl_start_state);
    ompl_simple_setup_->setStateValidityChecker(std::make_shared<StateValidityChecker>(this));
  }
 
  if (path_constraints_ && constraints_library_)
  {
    const ConstraintApproximationPtr& constraint_approx =
        constraints_library_->getConstraintApproximation(path_constraints_msg_);
    if (constraint_approx)
    {
      getOMPLStateSpace()->setInterpolationFunction(constraint_approx->getInterpolationFunction());
      RCLCPP_INFO(getLogger(), "Using precomputed interpolation states");
    }
  }
 
  useConfig();
  if (ompl_simple_setup_->getGoal())
    ompl_simple_setup_->setup();
}
 
void ModelBasedPlanningContext::setProjectionEvaluator(const std::string& peval)
{
  if (!spec_.state_space_)
  {
    RCLCPP_ERROR(getLogger(), "No state space is configured yet");
    return;
  }
  ob::ProjectionEvaluatorPtr projection_eval = getProjectionEvaluator(peval);
  if (projection_eval)
    spec_.state_space_->registerDefaultProjection(projection_eval);
}
 
ompl::base::ProjectionEvaluatorPtr ModelBasedPlanningContext::getProjectionEvaluator(const std::string& peval) const
{
  if (peval.find_first_of("link(") == 0 && peval[peval.length() - 1] == ')')
  {
    std::string link_name = peval.substr(5, peval.length() - 6);
    if (getRobotModel()->hasLinkModel(link_name))
    {
      return std::make_shared<ProjectionEvaluatorLinkPose>(this, link_name);
    }
    else
    {
      RCLCPP_ERROR(getLogger(),
                   "Attempted to set projection evaluator with respect to position of link '%s', "
                   "but that link is not known to the kinematic model.",
                   link_name.c_str());
    }
  }
  else if (peval.find_first_of("joints(") == 0 && peval[peval.length() - 1] == ')')
  {
    std::string joints = peval.substr(7, peval.length() - 8);
    boost::replace_all(joints, ",", " ");
    std::vector<unsigned int> j;
    std::stringstream ss(joints);
    while (ss.good() && !ss.eof())
    {
      std::string joint;
      ss >> joint >> std::ws;
      if (getJointModelGroup()->hasJointModel(joint))
      {
        unsigned int variable_count = getJointModelGroup()->getJointModel(joint)->getVariableCount();
        if (variable_count > 0)
        {
          int idx = getJointModelGroup()->getVariableGroupIndex(joint);
          for (unsigned int q = 0; q < variable_count; ++q)
          {
            j.push_back(idx + q);
          }
        }
        else
        {
          RCLCPP_WARN(getLogger(), "%s: Ignoring joint '%s' in projection since it has 0 DOF", name_.c_str(),
                      joint.c_str());
        }
      }
      else
      {
        RCLCPP_ERROR(getLogger(),
                     "%s: Attempted to set projection evaluator with respect to value of joint "
                     "'%s', but that joint is not known to the group '%s'.",
                     name_.c_str(), joint.c_str(), getGroupName().c_str());
      }
    }
    if (j.empty())
    {
      RCLCPP_ERROR(getLogger(), "%s: No valid joints specified for joint projection", name_.c_str());
    }
    else
    {
      return std::make_shared<ProjectionEvaluatorJointValue>(this, j);
    }
  }
  else
  {
    RCLCPP_ERROR(getLogger(), "Unable to allocate projection evaluator based on description: '%s'", peval.c_str());
  }
  return ob::ProjectionEvaluatorPtr();
}
 
ompl::base::StateSamplerPtr
ModelBasedPlanningContext::allocPathConstrainedSampler(const ompl::base::StateSpace* state_space) const
{
  if (spec_.state_space_.get() != state_space)
  {
    RCLCPP_ERROR(getLogger(), "%s: Attempted to allocate a state sampler for an unknown state space", name_.c_str());
    return ompl::base::StateSamplerPtr();
  }
 
  RCLCPP_DEBUG(getLogger(), "%s: Allocating a new state sampler (attempts to use path constraints)", name_.c_str());
 
  if (path_constraints_)
  {
    if (constraints_library_)
    {
      const ConstraintApproximationPtr& constraint_approx =
          constraints_library_->getConstraintApproximation(path_constraints_msg_);
      if (constraint_approx)
      {
        ompl::base::StateSamplerAllocator state_sampler_allocator =
            constraint_approx->getStateSamplerAllocator(path_constraints_msg_);
        if (state_sampler_allocator)
        {
          ompl::base::StateSamplerPtr state_sampler = state_sampler_allocator(state_space);
          if (state_sampler)
          {
            RCLCPP_INFO(getLogger(),
                        "%s: Using precomputed state sampler (approximated constraint space) for constraint '%s'",
                        name_.c_str(), path_constraints_msg_.name.c_str());
            return state_sampler;
          }
        }
      }
    }
 
    constraint_samplers::ConstraintSamplerPtr constraint_sampler;
    if (spec_.constraint_sampler_manager_)
    {
      constraint_sampler = spec_.constraint_sampler_manager_->selectSampler(getPlanningScene(), getGroupName(),
                                                                            path_constraints_->getAllConstraints());
    }
 
    if (constraint_sampler)
    {
      RCLCPP_INFO(getLogger(), "%s: Allocating specialized state sampler for state space", name_.c_str());
      return std::make_shared<ConstrainedSampler>(this, constraint_sampler);
    }
  }
  RCLCPP_DEBUG(getLogger(), "%s: Allocating default state sampler for state space", name_.c_str());
  return state_space->allocDefaultStateSampler();
}
 
void ModelBasedPlanningContext::useConfig()
{
  const std::map<std::string, std::string>& config = spec_.config_;
  if (config.empty())
    return;
  std::map<std::string, std::string> cfg = config;
 
  // set the distance between waypoints when interpolating and collision checking.
  auto it = cfg.find("longest_valid_segment_fraction");
  // If one of the two variables is set.
  if (it != cfg.end() || max_solution_segment_length_ != 0.0)
  {
    // clang-format off
    double longest_valid_segment_fraction_config = (it != cfg.end())
      ? moveit::core::toDouble(it->second)  // value from config file if there
      : 0.01;  // default value in OMPL.
    double longest_valid_segment_fraction_final = longest_valid_segment_fraction_config;
    if (max_solution_segment_length_ > 0.0)
    {
      // If this parameter is specified too, take the most conservative of the two variables,
      // i.e. the one that uses the shorter segment length.
      longest_valid_segment_fraction_final = std::min(
          longest_valid_segment_fraction_config,
          max_solution_segment_length_ / spec_.state_space_->getMaximumExtent()
      );
    }
    // clang-format on
 
    // convert to string using no locale
    cfg["longest_valid_segment_fraction"] = moveit::core::toString(longest_valid_segment_fraction_final);
  }
 
  // set the projection evaluator
  it = cfg.find("projection_evaluator");
  if (it != cfg.end())
  {
    setProjectionEvaluator(boost::trim_copy(it->second));
    cfg.erase(it);
  }
 
  if (cfg.empty())
  {
    return;
  }
 
  std::string optimizer;
  ompl::base::OptimizationObjectivePtr objective;
  it = cfg.find("optimization_objective");
  if (it != cfg.end())
  {
    optimizer = it->second;
    cfg.erase(it);
 
    if (optimizer == "PathLengthOptimizationObjective")
    {
      objective =
          std::make_shared<ompl::base::PathLengthOptimizationObjective>(ompl_simple_setup_->getSpaceInformation());
    }
    else if (optimizer == "MinimaxObjective")
    {
      objective = std::make_shared<ompl::base::MinimaxObjective>(ompl_simple_setup_->getSpaceInformation());
    }
    else if (optimizer == "StateCostIntegralObjective")
    {
      objective = std::make_shared<ompl::base::StateCostIntegralObjective>(ompl_simple_setup_->getSpaceInformation());
    }
    else if (optimizer == "MechanicalWorkOptimizationObjective")
    {
      objective =
          std::make_shared<ompl::base::MechanicalWorkOptimizationObjective>(ompl_simple_setup_->getSpaceInformation());
    }
    else if (optimizer == "MaximizeMinClearanceObjective")
    {
      objective =
          std::make_shared<ompl::base::MaximizeMinClearanceObjective>(ompl_simple_setup_->getSpaceInformation());
    }
    else
    {
      RCLCPP_WARN(getLogger(),
                  "Optimization objective %s is invalid or not defined, using PathLengthOptimizationObjective instead",
                  optimizer.c_str());
      objective =
          std::make_shared<ompl::base::PathLengthOptimizationObjective>(ompl_simple_setup_->getSpaceInformation());
    }
 
    ompl_simple_setup_->setOptimizationObjective(objective);
  }
 
  // Don't clear planner data if multi-query planning is enabled
  it = cfg.find("multi_query_planning_enabled");
  if (it != cfg.end())
  {
    multi_query_planning_enabled_ = boost::lexical_cast<bool>(it->second);
  }
 
  // check whether the path returned by the planner should be interpolated
  it = cfg.find("interpolate");
  if (it != cfg.end())
  {
    interpolate_ = boost::lexical_cast<bool>(it->second);
    cfg.erase(it);
  }
 
  // check whether the path returned by the planner should be simplified
  it = cfg.find("simplify_solutions");
  if (it != cfg.end())
  {
    simplify_solutions_ = boost::lexical_cast<bool>(it->second);
    cfg.erase(it);
  }
 
  // check whether solution paths from parallel planning should be hybridized
  it = cfg.find("hybridize");
  if (it != cfg.end())
  {
    hybridize_ = boost::lexical_cast<bool>(it->second);
    cfg.erase(it);
  }
 
  // remove the 'type' parameter; the rest are parameters for the planner itself
  it = cfg.find("type");
  if (it == cfg.end())
  {
    if (name_ != getGroupName())
      RCLCPP_WARN(getLogger(), "%s: Attribute 'type' not specified in planner configuration", name_.c_str());
  }
  else
  {
    std::string type = it->second;
    cfg.erase(it);
    const std::string planner_name = getGroupName() + "/" + name_;
    ompl_simple_setup_->setPlannerAllocator(
        [planner_name, &spec = spec_, allocator = spec_.planner_selector_(type)](
            const ompl::base::SpaceInformationPtr& si) { return allocator(si, planner_name, spec); });
    RCLCPP_INFO(getLogger(),
                "Planner configuration '%s' will use planner '%s'. "
                "Additional configuration parameters will be set when the planner is constructed.",
                name_.c_str(), type.c_str());
  }
 
  // call the setParams() after setup(), so we know what the params are
  ompl_simple_setup_->getSpaceInformation()->setup();
  ompl_simple_setup_->getSpaceInformation()->params().setParams(cfg, true);
  // call setup() again for possibly new param values
  ompl_simple_setup_->getSpaceInformation()->setup();
}
 
void ModelBasedPlanningContext::setPlanningVolume(const moveit_msgs::msg::WorkspaceParameters& wparams)
{
  if (wparams.min_corner.x == wparams.max_corner.x && wparams.min_corner.x == 0.0 &&
      wparams.min_corner.y == wparams.max_corner.y && wparams.min_corner.y == 0.0 &&
      wparams.min_corner.z == wparams.max_corner.z && wparams.min_corner.z == 0.0)
  {
    RCLCPP_WARN(getLogger(), "It looks like the planning volume was not specified.");
  }
 
  RCLCPP_DEBUG(getLogger(),
               "%s: Setting planning volume (affects SE2 & SE3 joints only) to x = [%f, %f], y = "
               "[%f, %f], z = [%f, %f]",
               name_.c_str(), wparams.min_corner.x, wparams.max_corner.x, wparams.min_corner.y, wparams.max_corner.y,
               wparams.min_corner.z, wparams.max_corner.z);
 
  spec_.state_space_->setPlanningVolume(wparams.min_corner.x, wparams.max_corner.x, wparams.min_corner.y,
                                        wparams.max_corner.y, wparams.min_corner.z, wparams.max_corner.z);
}
 
void ModelBasedPlanningContext::simplifySolution(double timeout)
{
  ompl::time::point start = ompl::time::now();
  ob::PlannerTerminationCondition ptc = constructPlannerTerminationCondition(timeout, start);
  registerTerminationCondition(ptc);
  ompl_simple_setup_->simplifySolution(ptc);
  last_simplify_time_ = ompl_simple_setup_->getLastSimplificationTime();
  unregisterTerminationCondition();
}
 
void ModelBasedPlanningContext::interpolateSolution()
{
  if (ompl_simple_setup_->haveSolutionPath())
  {
    og::PathGeometric& pg = ompl_simple_setup_->getSolutionPath();
 
    // Find the number of states that will be in the interpolated solution.
    // This is what interpolate() does internally.
    unsigned int eventual_states = 1;
    std::vector<ompl::base::State*> states = pg.getStates();
    for (size_t i = 0; i < states.size() - 1; ++i)
    {
      eventual_states += ompl_simple_setup_->getStateSpace()->validSegmentCount(states[i], states[i + 1]);
    }
 
    if (eventual_states < minimum_waypoint_count_)
    {
      // If that's not enough states, use the minimum amount instead.
      pg.interpolate(minimum_waypoint_count_);
    }
    else
    {
      // Interpolate the path to have as the exact states that are checked when validating motions.
      pg.interpolate();
    }
  }
}
 
void ModelBasedPlanningContext::convertPath(const ompl::geometric::PathGeometric& pg,
                                            robot_trajectory::RobotTrajectory& traj) const
{
  moveit::core::RobotState ks = complete_initial_robot_state_;
  for (std::size_t i = 0; i < pg.getStateCount(); ++i)
  {
    spec_.state_space_->copyToRobotState(ks, pg.getState(i));
    traj.addSuffixWayPoint(ks, 0.0);
  }
}
 
bool ModelBasedPlanningContext::getSolutionPath(robot_trajectory::RobotTrajectory& traj) const
{
  traj.clear();
  if (ompl_simple_setup_->haveSolutionPath())
  {
    convertPath(ompl_simple_setup_->getSolutionPath(), traj);
  }
  return ompl_simple_setup_->haveSolutionPath();
}
 
void ModelBasedPlanningContext::setVerboseStateValidityChecks(bool flag)
{
  if (ompl_simple_setup_->getStateValidityChecker())
  {
    static_cast<StateValidityChecker*>(ompl_simple_setup_->getStateValidityChecker().get())->setVerbose(flag);
  }
}
 
ompl::base::GoalPtr ModelBasedPlanningContext::constructGoal()
{
  // ******************* set up the goal representation, based on goal constraints
 
  std::vector<ob::GoalPtr> goals;
  for (kinematic_constraints::KinematicConstraintSetPtr& goal_constraint : goal_constraints_)
  {
    constraint_samplers::ConstraintSamplerPtr constraint_sampler;
    if (spec_.constraint_sampler_manager_)
    {
      constraint_sampler = spec_.constraint_sampler_manager_->selectSampler(getPlanningScene(), getGroupName(),
                                                                            goal_constraint->getAllConstraints());
    }
 
    if (constraint_sampler)
    {
      ob::GoalPtr goal = std::make_shared<ConstrainedGoalSampler>(this, goal_constraint, constraint_sampler);
      goals.push_back(goal);
    }
  }
 
  if (!goals.empty())
  {
    return goals.size() == 1 ? goals[0] : std::make_shared<GoalSampleableRegionMux>(goals);
  }
  else
  {
    RCLCPP_ERROR(getLogger(), "Unable to construct goal representation");
  }
 
  return ob::GoalPtr();
}
 
ompl::base::PlannerTerminationCondition
ModelBasedPlanningContext::constructPlannerTerminationCondition(double timeout, const ompl::time::point& start)
{
  auto it = spec_.config_.find("termination_condition");
  if (it == spec_.config_.end())
  {
    return ob::timedPlannerTerminationCondition(timeout - ompl::time::seconds(ompl::time::now() - start));
  }
 
  std::string termination_string = it->second;
  std::vector<std::string> termination_and_params;
  boost::split(termination_and_params, termination_string, boost::is_any_of("[ ,]"));
 
  if (termination_and_params.empty())
  {
    RCLCPP_ERROR(getLogger(), "Termination condition not specified");
  }
 
  // Terminate if a maximum number of iterations is exceeded or a timeout occurs.
  // The semantics of "iterations" are planner-specific, but typically it corresponds to the number of times
  // an attempt was made to grow a roadmap/tree.
  else if (termination_and_params[0] == "Iteration")
  {
    if (termination_and_params.size() > 1)
    {
      return ob::plannerOrTerminationCondition(
          ob::timedPlannerTerminationCondition(timeout - ompl::time::seconds(ompl::time::now() - start)),
          ob::IterationTerminationCondition(std::stoul(termination_and_params[1])));
    }
    else
    {
      RCLCPP_ERROR(getLogger(), "Missing argument to Iteration termination condition");
    }
  }
  // Terminate if the cost has converged or a timeout occurs.
  // Only useful for anytime/optimizing planners.
  else if (termination_and_params[0] == "CostConvergence")
  {
    std::size_t solutions_window = 10u;
    double epsilon = 0.1;
    if (termination_and_params.size() > 1)
    {
      solutions_window = std::stoul(termination_and_params[1]);
      if (termination_and_params.size() > 2)
      {
        epsilon = moveit::core::toDouble(termination_and_params[2]);
      }
    }
    return ob::plannerOrTerminationCondition(
        ob::timedPlannerTerminationCondition(timeout - ompl::time::seconds(ompl::time::now() - start)),
        ob::CostConvergenceTerminationCondition(ompl_simple_setup_->getProblemDefinition(), solutions_window, epsilon));
  }
  // Terminate as soon as an exact solution is found or a timeout occurs.
  // This modifies the behavior of anytime/optimizing planners to terminate upon discovering
  // the first feasible solution.
  else if (termination_and_params[0] == "ExactSolution")
  {
    return ob::plannerOrTerminationCondition(
        ob::timedPlannerTerminationCondition(timeout - ompl::time::seconds(ompl::time::now() - start)),
        ob::exactSolnPlannerTerminationCondition(ompl_simple_setup_->getProblemDefinition()));
  }
  else
  {
    RCLCPP_ERROR(getLogger(), "Unknown planner termination condition");
  }
  // return a planner termination condition to suppress compiler warning
  return ob::plannerAlwaysTerminatingCondition();
}
 
void ModelBasedPlanningContext::setCompleteInitialState(const moveit::core::RobotState& complete_initial_robot_state)
{
  complete_initial_robot_state_ = complete_initial_robot_state;
  complete_initial_robot_state_.update();
}
 
void ModelBasedPlanningContext::clear()
{
  if (!multi_query_planning_enabled_)
  {
    ompl_simple_setup_->clear();
  }
  else
  {
    // For LazyPRM and LazyPRMstar we assume that the environment *could* have changed
    // This means that we need to reset the validity flags for every node and edge in
    // the roadmap. For PRM and PRMstar we assume that the environment is static. If
    // this is not the case, then multi-query planning should not be enabled.
    auto planner = dynamic_cast<ompl::geometric::LazyPRM*>(ompl_simple_setup_->getPlanner().get());
    if (planner != nullptr)
    {
      planner->clearValidity();
    }
  }
  ompl_simple_setup_->clearStartStates();
  ompl_simple_setup_->setGoal(ob::GoalPtr());
  ompl_simple_setup_->setStateValidityChecker(ob::StateValidityCheckerPtr());
  path_constraints_.reset();
  goal_constraints_.clear();
  getOMPLStateSpace()->setInterpolationFunction(InterpolationFunction());
}
 
bool ModelBasedPlanningContext::setPathConstraints(const moveit_msgs::msg::Constraints& path_constraints,
                                                   moveit_msgs::msg::MoveItErrorCodes* /*error*/)
{
  // ******************* set the path constraints to use
  path_constraints_ = std::make_shared<kinematic_constraints::KinematicConstraintSet>(getRobotModel());
  path_constraints_->add(path_constraints, getPlanningScene()->getTransforms());
  path_constraints_msg_ = path_constraints;
 
  return true;
}
 
bool ModelBasedPlanningContext::setGoalConstraints(const std::vector<moveit_msgs::msg::Constraints>& goal_constraints,
                                                   const moveit_msgs::msg::Constraints& path_constraints,
                                                   moveit_msgs::msg::MoveItErrorCodes* error)
{
  // ******************* check if the input is correct
  goal_constraints_.clear();
  for (const moveit_msgs::msg::Constraints& goal_constraint : goal_constraints)
  {
    moveit_msgs::msg::Constraints constr = kinematic_constraints::mergeConstraints(goal_constraint, path_constraints);
    kinematic_constraints::KinematicConstraintSetPtr kset(
        new kinematic_constraints::KinematicConstraintSet(getRobotModel()));
    kset->add(constr, getPlanningScene()->getTransforms());
    if (!kset->empty())
    {
      goal_constraints_.push_back(kset);
    }
  }
 
  if (goal_constraints_.empty())
  {
    RCLCPP_WARN(getLogger(), "%s: No goal constraints specified. There is no problem to solve.", name_.c_str());
    if (error)
    {
      error->val = moveit_msgs::msg::MoveItErrorCodes::INVALID_GOAL_CONSTRAINTS;
    }
    return false;
  }
 
  ob::GoalPtr goal = constructGoal();
  ompl_simple_setup_->setGoal(goal);
  return static_cast<bool>(goal);
}
 
bool ModelBasedPlanningContext::benchmark(double timeout, unsigned int count, const std::string& filename)
{
  ompl_benchmark_.clearPlanners();
  ompl_simple_setup_->setup();
  ompl_benchmark_.addPlanner(ompl_simple_setup_->getPlanner());
  ompl_benchmark_.setExperimentName(getRobotModel()->getName() + "_" + getGroupName() + "_" +
                                    getPlanningScene()->getName() + "_" + name_);
 
  ot::Benchmark::Request req;
  req.maxTime = timeout;
  req.runCount = count;
  req.displayProgress = true;
  req.saveConsoleOutput = false;
  ompl_benchmark_.benchmark(req);
  return filename.empty() ? ompl_benchmark_.saveResultsToFile() : ompl_benchmark_.saveResultsToFile(filename.c_str());
}
 
void ModelBasedPlanningContext::startSampling()
{
  bool gls = ompl_simple_setup_->getGoal()->hasType(ob::GOAL_LAZY_SAMPLES);
  if (gls)
  {
    static_cast<ob::GoalLazySamples*>(ompl_simple_setup_->getGoal().get())->startSampling();
  }
  else
  {
    // we know this is a GoalSampleableMux by elimination
    static_cast<GoalSampleableRegionMux*>(ompl_simple_setup_->getGoal().get())->startSampling();
  }
}
 
void ModelBasedPlanningContext::stopSampling()
{
  bool gls = ompl_simple_setup_->getGoal()->hasType(ob::GOAL_LAZY_SAMPLES);
  if (gls)
  {
    static_cast<ob::GoalLazySamples*>(ompl_simple_setup_->getGoal().get())->stopSampling();
  }
  else
  {
    // we know this is a GoalSampleableMux by elimination
    static_cast<GoalSampleableRegionMux*>(ompl_simple_setup_->getGoal().get())->stopSampling();
  }
}
 
void ModelBasedPlanningContext::preSolve()
{
  // clear previously computed solutions
  ompl_simple_setup_->getProblemDefinition()->clearSolutionPaths();
  const ob::PlannerPtr planner = ompl_simple_setup_->getPlanner();
  if (planner && !multi_query_planning_enabled_)
  {
    planner->clear();
  }
  startSampling();
  ompl_simple_setup_->getSpaceInformation()->getMotionValidator()->resetMotionCounter();
}
 
void ModelBasedPlanningContext::postSolve()
{
  stopSampling();
  int v = ompl_simple_setup_->getSpaceInformation()->getMotionValidator()->getValidMotionCount();
  int iv = ompl_simple_setup_->getSpaceInformation()->getMotionValidator()->getInvalidMotionCount();
  RCLCPP_DEBUG(getLogger(), "There were %d valid motions and %d invalid motions.", v, iv);
 
  // Debug OMPL setup and solution
  RCLCPP_DEBUG(getLogger(), "%s",
               [&] {
                 std::stringstream debug_out;
                 ompl_simple_setup_->print(debug_out);
                 return debug_out.str();
               }()
                   .c_str());
}
 
void ModelBasedPlanningContext::solve(planning_interface::MotionPlanResponse& res)
{
  res.planner_id = request_.planner_id;
  res.error_code = solve(request_.allowed_planning_time, request_.num_planning_attempts);
  if (res.error_code.val != moveit_msgs::msg::MoveItErrorCodes::SUCCESS)
  {
    RCLCPP_ERROR(getLogger(), "Unable to solve the planning problem");
    return;
  }
  double ptime = getLastPlanTime();
  if (simplify_solutions_)
  {
    simplifySolution(request_.allowed_planning_time - ptime);
    ptime += getLastSimplifyTime();
  }
 
  if (interpolate_)
  {
    interpolateSolution();
  }
 
  // fill the response
  RCLCPP_DEBUG(getLogger(), "%s: Returning successful solution with %lu states", getName().c_str(),
               getOMPLSimpleSetup()->getSolutionPath().getStateCount());
 
  res.trajectory = std::make_shared<robot_trajectory::RobotTrajectory>(getRobotModel(), getGroupName());
  getSolutionPath(*res.trajectory);
  res.planning_time = ptime;
}
 
void ModelBasedPlanningContext::solve(planning_interface::MotionPlanDetailedResponse& res)
{
  res.planner_id = request_.planner_id;
  res.error_code = solve(request_.allowed_planning_time, request_.num_planning_attempts);
  if (res.error_code.val != moveit_msgs::msg::MoveItErrorCodes::SUCCESS)
  {
    RCLCPP_INFO(getLogger(), "Unable to solve the planning problem");
    return;
  }
 
  res.trajectory.reserve(3);
 
  // add info about planned solution
  double ptime = getLastPlanTime();
  res.processing_time.push_back(ptime);
  res.description.emplace_back("plan");
  res.trajectory.resize(res.trajectory.size() + 1);
  res.trajectory.back() = std::make_shared<robot_trajectory::RobotTrajectory>(getRobotModel(), getGroupName());
  getSolutionPath(*res.trajectory.back());
 
  // simplify solution if time remains
  if (simplify_solutions_)
  {
    simplifySolution(request_.allowed_planning_time - ptime);
    res.processing_time.push_back(getLastSimplifyTime());
    res.description.emplace_back("simplify");
    res.trajectory.resize(res.trajectory.size() + 1);
    res.trajectory.back() = std::make_shared<robot_trajectory::RobotTrajectory>(getRobotModel(), getGroupName());
    getSolutionPath(*res.trajectory.back());
  }
 
  if (interpolate_)
  {
    ompl::time::point start_interpolate = ompl::time::now();
    interpolateSolution();
    res.processing_time.push_back(ompl::time::seconds(ompl::time::now() - start_interpolate));
    res.description.emplace_back("interpolate");
    res.trajectory.resize(res.trajectory.size() + 1);
    res.trajectory.back() = std::make_shared<robot_trajectory::RobotTrajectory>(getRobotModel(), getGroupName());
    getSolutionPath(*res.trajectory.back());
  }
 
  RCLCPP_DEBUG(getLogger(), "%s: Returning successful solution with %lu states", getName().c_str(),
               getOMPLSimpleSetup()->getSolutionPath().getStateCount());
}
 
const moveit_msgs::msg::MoveItErrorCodes ModelBasedPlanningContext::solve(double timeout, unsigned int count)
{
  ompl::time::point start = ompl::time::now();
  preSolve();
 
  moveit_msgs::msg::MoveItErrorCodes result;
  result.val = moveit_msgs::msg::MoveItErrorCodes::FAILURE;
  if (count <= 1 || multi_query_planning_enabled_)  // multi-query planners should always run in single instances
  {
    RCLCPP_DEBUG(getLogger(), "%s: Solving the planning problem once...", name_.c_str());
    ob::PlannerTerminationCondition ptc = constructPlannerTerminationCondition(timeout, start);
    registerTerminationCondition(ptc);
    std::ignore = ompl_simple_setup_->solve(ptc);
    last_plan_time_ = ompl_simple_setup_->getLastPlanComputationTime();
    unregisterTerminationCondition();
    // fill the result status code
    result.val = logPlannerStatus(ompl_simple_setup_);
  }
  else
  {
    RCLCPP_DEBUG(getLogger(), "%s: Solving the planning problem %u times...", name_.c_str(), count);
    ompl_parallel_plan_.clearHybridizationPaths();
    if (count <= max_planning_threads_)
    {
      ompl_parallel_plan_.clearPlanners();
      if (ompl_simple_setup_->getPlannerAllocator())
      {
        for (unsigned int i = 0; i < count; ++i)
        {
          ompl_parallel_plan_.addPlannerAllocator(ompl_simple_setup_->getPlannerAllocator());
        }
      }
      else
      {
        for (unsigned int i = 0; i < count; ++i)
        {
          ompl_parallel_plan_.addPlanner(ompl::tools::SelfConfig::getDefaultPlanner(ompl_simple_setup_->getGoal()));
        }
      }
 
      ob::PlannerTerminationCondition ptc = constructPlannerTerminationCondition(timeout, start);
      registerTerminationCondition(ptc);
      if (ompl_parallel_plan_.solve(ptc, 1, count, hybridize_) == ompl::base::PlannerStatus::EXACT_SOLUTION)
      {
        result.val = moveit_msgs::msg::MoveItErrorCodes::SUCCESS;
      }
      last_plan_time_ = ompl::time::seconds(ompl::time::now() - start);
      unregisterTerminationCondition();
    }
    else
    {
      ob::PlannerTerminationCondition ptc = constructPlannerTerminationCondition(timeout, start);
      registerTerminationCondition(ptc);
      int n = count / max_planning_threads_;
      result.val = moveit_msgs::msg::MoveItErrorCodes::SUCCESS;
      for (int i = 0; i < n && !ptc(); ++i)
      {
        ompl_parallel_plan_.clearPlanners();
        if (ompl_simple_setup_->getPlannerAllocator())
        {
          for (unsigned int i = 0; i < max_planning_threads_; ++i)
          {
            ompl_parallel_plan_.addPlannerAllocator(ompl_simple_setup_->getPlannerAllocator());
          }
        }
        else
        {
          for (unsigned int i = 0; i < max_planning_threads_; ++i)
          {
            ompl_parallel_plan_.addPlanner(ompl::tools::SelfConfig::getDefaultPlanner(ompl_simple_setup_->getGoal()));
          }
        }
 
        bool r = ompl_parallel_plan_.solve(ptc, 1, count, hybridize_) == ompl::base::PlannerStatus::EXACT_SOLUTION;
        // Was this latest call successful too?
        result.val = (result.val == moveit_msgs::msg::MoveItErrorCodes::SUCCESS && r) ?
                         moveit_msgs::msg::MoveItErrorCodes::SUCCESS :
                         moveit_msgs::msg::MoveItErrorCodes::FAILURE;
      }
      n = count % max_planning_threads_;
      if (n && !ptc())
      {
        ompl_parallel_plan_.clearPlanners();
        if (ompl_simple_setup_->getPlannerAllocator())
        {
          for (int i = 0; i < n; ++i)
          {
            ompl_parallel_plan_.addPlannerAllocator(ompl_simple_setup_->getPlannerAllocator());
          }
        }
        else
        {
          for (int i = 0; i < n; ++i)
          {
            ompl_parallel_plan_.addPlanner(ompl::tools::SelfConfig::getDefaultPlanner(ompl_simple_setup_->getGoal()));
          }
        }
 
        bool r = ompl_parallel_plan_.solve(ptc, 1, count, hybridize_) == ompl::base::PlannerStatus::EXACT_SOLUTION;
        // Was this latest call successful too?
        result.val = (result.val == moveit_msgs::msg::MoveItErrorCodes::SUCCESS && r) ?
                         moveit_msgs::msg::MoveItErrorCodes::SUCCESS :
                         moveit_msgs::msg::MoveItErrorCodes::FAILURE;
      }
      last_plan_time_ = ompl::time::seconds(ompl::time::now() - start);
      unregisterTerminationCondition();
    }
  }
 
  postSolve();
  return result;
}
 
void ModelBasedPlanningContext::registerTerminationCondition(const ob::PlannerTerminationCondition& ptc)
{
  std::unique_lock<std::mutex> slock(ptc_lock_);
  ptc_ = &ptc;
}
 
void ModelBasedPlanningContext::unregisterTerminationCondition()
{
  std::unique_lock<std::mutex> slock(ptc_lock_);
  ptc_ = nullptr;
}
 
int32_t ModelBasedPlanningContext::logPlannerStatus(const og::SimpleSetupPtr& ompl_simple_setup)
{
  auto result = moveit_msgs::msg::MoveItErrorCodes::PLANNING_FAILED;
  const ompl::base::PlannerStatus ompl_status = ompl_simple_setup->getLastPlannerStatus();
  switch (ompl::base::PlannerStatus::StatusType(ompl_status))
  {
    case ompl::base::PlannerStatus::UNKNOWN:
      RCLCPP_WARN(getLogger(), "Motion planning failed for an unknown reason");
      result = moveit_msgs::msg::MoveItErrorCodes::PLANNING_FAILED;
      break;
    case ompl::base::PlannerStatus::INVALID_START:
      RCLCPP_WARN(getLogger(), "Invalid start state");
      result = moveit_msgs::msg::MoveItErrorCodes::START_STATE_INVALID;
      break;
    case ompl::base::PlannerStatus::INVALID_GOAL:
      RCLCPP_WARN(getLogger(), "Invalid goal state");
      result = moveit_msgs::msg::MoveItErrorCodes::GOAL_STATE_INVALID;
      break;
    case ompl::base::PlannerStatus::UNRECOGNIZED_GOAL_TYPE:
      RCLCPP_WARN(getLogger(), "Unrecognized goal type");
      result = moveit_msgs::msg::MoveItErrorCodes::UNRECOGNIZED_GOAL_TYPE;
      break;
    case ompl::base::PlannerStatus::TIMEOUT:
      RCLCPP_WARN(getLogger(), "Timed out: %.1fs ≥ %.1fs", ompl_simple_setup->getLastPlanComputationTime(),
                  request_.allowed_planning_time);
      result = moveit_msgs::msg::MoveItErrorCodes::TIMED_OUT;
      break;
    case ompl::base::PlannerStatus::APPROXIMATE_SOLUTION:
      // timeout is a common reason for APPROXIMATE_SOLUTION
      if (ompl_simple_setup->getLastPlanComputationTime() > request_.allowed_planning_time)
      {
        RCLCPP_WARN(getLogger(), "Planning timed out: %.1fs ≥ %.1fs", ompl_simple_setup->getLastPlanComputationTime(),
                    request_.allowed_planning_time);
        result = moveit_msgs::msg::MoveItErrorCodes::TIMED_OUT;
      }
      else
      {
        RCLCPP_WARN(getLogger(), "Solution is approximate");
        result = moveit_msgs::msg::MoveItErrorCodes::PLANNING_FAILED;
      }
      break;
    case ompl::base::PlannerStatus::EXACT_SOLUTION:
      result = moveit_msgs::msg::MoveItErrorCodes::SUCCESS;
      break;
    case ompl::base::PlannerStatus::CRASH:
      RCLCPP_WARN(getLogger(), "OMPL crashed!");
      result = moveit_msgs::msg::MoveItErrorCodes::CRASH;
      break;
    case ompl::base::PlannerStatus::ABORT:
      RCLCPP_WARN(getLogger(), "OMPL was aborted");
      result = moveit_msgs::msg::MoveItErrorCodes::ABORT;
      break;
    default:
      // This should never happen
      RCLCPP_WARN(getLogger(), "Unexpected PlannerStatus code from OMPL.");
      result = moveit_msgs::msg::MoveItErrorCodes::PLANNING_FAILED;
  }
  return result;
}
 
bool ModelBasedPlanningContext::terminate()
{
  std::unique_lock<std::mutex> slock(ptc_lock_);
  if (ptc_)
  {
    ptc_->terminate();
  }
  return true;
}
 
bool ModelBasedPlanningContext::saveConstraintApproximations(const rclcpp::Node::SharedPtr& node)
{
  std::string constraint_path;
  if (node->get_parameter("constraint_approximations_path", constraint_path))
  {
    constraints_library_->saveConstraintApproximations(constraint_path);
    return true;
  }
  RCLCPP_WARN(getLogger(), "ROS param 'constraint_approximations' not found. Unable to save constraint approximations");
  return false;
}
 
bool ModelBasedPlanningContext::loadConstraintApproximations(const rclcpp::Node::SharedPtr& node)
{
  std::string constraint_path;
  if (node->get_parameter("constraint_approximations_path", constraint_path))
  {
    constraints_library_->loadConstraintApproximations(constraint_path);
    std::stringstream ss;
    constraints_library_->printConstraintApproximations(ss);
    RCLCPP_INFO_STREAM(getLogger(), ss.str());
    return true;
  }
  return false;
}
 
}  // namespace ompl_interface