transform_provider.cpp

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/* Author: Suat Gedikli */
 
#include <moveit/mesh_filter/transform_provider.h>
#include <tf2_ros/transform_listener.h>
#include <tf2_ros/buffer.h>
#include <tf2_eigen/tf2_eigen.h>
 
TransformProvider::TransformProvider(double update_rate) : stop_(true), update_rate_(update_rate)
{
  tf_buffer_ = std::make_shared<tf2_ros::Buffer>();
  tf_listener_ = std::make_shared<tf2_ros::TransformListener>(*tf_buffer_);
  psm_ = std::make_shared<planning_scene_monitor::PlanningSceneMonitor>("robot_description", tf_buffer_);
  psm_->startStateMonitor();
}
 
TransformProvider::~TransformProvider()
{
  stop();
}
 
void TransformProvider::start()
{
  stop_ = false;
  thread_ = std::thread(&TransformProvider::run, this);
}
 
void TransformProvider::stop()
{
  stop_ = true;
  thread_.join();
}
 
void TransformProvider::addHandle(mesh_filter::MeshHandle handle, const std::string& name)
{
  if (!stop_)
    throw std::runtime_error("Can not add handles if TransformProvider is running");
 
  handle2context_[handle] = std::make_shared<TransformContext>(name);
}
 
void TransformProvider::setFrame(const std::string& frame)
{
  if (frame_id_ != frame)
  {
    frame_id_ = frame;
    for (auto& context_it : handle2context_)
    {
      // invalidate transformations
      context_it.second->mutex_.lock();
      context_it.second->transformation_.matrix().setZero();
      context_it.second->mutex_.unlock();
    }
  }
}
 
bool TransformProvider::getTransform(mesh_filter::MeshHandle handle, Eigen::Isometry3d& transform) const
{
  auto context_it = handle2context_.find(handle);
 
  if (context_it == handle2context_.end())
  {
    ROS_ERROR("Unable to find mesh with handle %d", handle);
    return false;
  }
  context_it->second->mutex_.lock();
  transform = context_it->second->transformation_;
  context_it->second->mutex_.unlock();
  return !(transform.matrix().isZero(0));
}
 
void TransformProvider::run()
{
  if (handle2context_.empty())
    throw std::runtime_error("TransformProvider is listening to empty list of frames!");
 
  while (ros::ok() && !stop_)
  {
    updateTransforms();
    update_rate_.sleep();
  }
}
 
void TransformProvider::setUpdateRate(double update_rate)
{
  update_rate_ = ros::Rate(update_rate);
}
 
void TransformProvider::updateTransforms()
{
  // Don't bother if frame_id_ is empty (true initially)
  if (frame_id_.empty())
  {
    ROS_DEBUG_THROTTLE(2., "Not updating transforms because frame_id_ is empty.");
    return;
  }
 
  static tf2::Stamped<Eigen::Isometry3d> input_transform, output_transform;
  static moveit::core::RobotStatePtr robot_state;
  robot_state = psm_->getStateMonitor()->getCurrentState();
  try
  {
    geometry_msgs::TransformStamped common_tf =
        tf_buffer_->lookupTransform(frame_id_, psm_->getPlanningScene()->getPlanningFrame(), ros::Time(0.0));
    input_transform.stamp_ = common_tf.header.stamp;
  }
  catch (tf2::TransformException& ex)
  {
    ROS_ERROR("TF Problem: %s", ex.what());
    return;
  }
  input_transform.frame_id_ = psm_->getPlanningScene()->getPlanningFrame();
 
  for (auto& context_it : handle2context_)
  {
    try
    {
      // TODO: check logic here - which global collision body's transform should be used?
      input_transform.setData(robot_state->getGlobalLinkTransform(context_it.second->frame_id_));
      tf_buffer_->transform(input_transform, output_transform, frame_id_);
    }
    catch (const tf2::TransformException& ex)
    {
      handle2context_[context_it.first]->mutex_.lock();
      handle2context_[context_it.first]->transformation_.matrix().setZero();
      handle2context_[context_it.first]->mutex_.unlock();
      continue;
    }
    catch (std::exception& ex)
    {
      ROS_ERROR("Caught %s while updating transforms", ex.what());
    }
    handle2context_[context_it.first]->mutex_.lock();
    handle2context_[context_it.first]->transformation_ = static_cast<Eigen::Isometry3d>(output_transform);
    handle2context_[context_it.first]->mutex_.unlock();
  }
}