source.cpp

// Copyright (c) 2022 Samsung R&D Institute Russia
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#include "nav2_collision_monitor/source.hpp"
 
#include <exception>
 
#include "geometry_msgs/msg/transform_stamped.hpp"
 
#include "nav2_ros_common/node_utils.hpp"
#include "nav2_util/robot_utils.hpp"
 
namespace nav2_collision_monitor
{
 
Source::Source(
  const nav2::LifecycleNode::WeakPtr & node,
  const std::string & source_name,
  const std::shared_ptr<tf2_ros::Buffer> tf_buffer,
  const std::string & base_frame_id,
  const std::string & global_frame_id,
  const tf2::Duration & transform_tolerance,
  const rclcpp::Duration & source_timeout,
  const bool base_shift_correction)
: node_(node), source_name_(source_name), tf_buffer_(tf_buffer),
  base_frame_id_(base_frame_id), global_frame_id_(global_frame_id),
  transform_tolerance_(transform_tolerance), source_timeout_(source_timeout),
  base_shift_correction_(base_shift_correction)
{
}
 
Source::~Source()
{
}
 
bool Source::configure()
{
  auto node = node_.lock();
 
  // Add callback for dynamic parameters
  dyn_params_handler_ = node->add_on_set_parameters_callback(
    std::bind(&Source::dynamicParametersCallback, this, std::placeholders::_1));
 
  return true;
}
 
void Source::getCommonParameters(std::string & source_topic)
{
  auto node = node_.lock();
  if (!node) {
    throw std::runtime_error{"Failed to lock node"};
  }
 
  source_topic = node->declare_or_get_parameter(
    source_name_ + ".topic", std::string("scan"));  // Set default topic for laser scanner
 
  enabled_ = node->declare_or_get_parameter(
    source_name_ + ".enabled", true);
 
  source_timeout_ = rclcpp::Duration::from_seconds(
    node->declare_or_get_parameter(
      source_name_ + ".source_timeout",
      source_timeout_.seconds()));  // node source_timeout by default
}
 
bool Source::sourceValid(
  const rclcpp::Time & source_time,
  const rclcpp::Time & curr_time) const
{
  // Source is considered as not valid, if latest received data timestamp is earlier
  // than current time by source_timeout_ interval
  const rclcpp::Duration dt = curr_time - source_time;
  if (source_timeout_.seconds() != 0.0 && dt > source_timeout_) {
    RCLCPP_WARN(
      logger_,
      "[%s]: Latest source and current collision monitor node timestamps differ on %f seconds. "
      "Ignoring the source.",
      source_name_.c_str(), dt.seconds());
    return false;
  }
 
  return true;
}
 
bool Source::getEnabled() const
{
  return enabled_;
}
 
std::string Source::getSourceName() const
{
  return source_name_;
}
 
rclcpp::Duration Source::getSourceTimeout() const
{
  return source_timeout_;
}
 
rcl_interfaces::msg::SetParametersResult
Source::dynamicParametersCallback(
  std::vector<rclcpp::Parameter> parameters)
{
  rcl_interfaces::msg::SetParametersResult result;
 
  for (auto parameter : parameters) {
    const auto & param_type = parameter.get_type();
    const auto & param_name = parameter.get_name();
    if(param_name.find(source_name_ + ".") != 0) {
      continue;
    }
    if (param_type == rcl_interfaces::msg::ParameterType::PARAMETER_BOOL) {
      if (param_name == source_name_ + "." + "enabled") {
        enabled_ = parameter.as_bool();
      }
    }
  }
  result.successful = true;
  return result;
}
 
bool Source::getTransform(
  const rclcpp::Time & curr_time,
  const std_msgs::msg::Header & data_header,
  tf2::Transform & tf_transform) const
{
  if (base_shift_correction_) {
    if (
      !nav2_util::getTransform(
        data_header.frame_id, data_header.stamp,
        base_frame_id_, curr_time, global_frame_id_,
        transform_tolerance_, tf_buffer_, tf_transform))
    {
      return false;
    }
  } else {
    if (
      !nav2_util::getTransform(
        data_header.frame_id, base_frame_id_,
        transform_tolerance_, tf_buffer_, tf_transform))
    {
      return false;
    }
  }
  return true;
}
 
}  // namespace nav2_collision_monitor