node_utils.hpp

// Copyright (c) 2019 Intel Corporation
// Copyright (c) 2023 Open Navigation LLC
//
// 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.
 
#ifndef NAV2_UTIL__NODE_UTILS_HPP_
#define NAV2_UTIL__NODE_UTILS_HPP_
 
#include <vector>
#include <string>
#include "rclcpp/rclcpp.hpp"
#include "rcl_interfaces/srv/list_parameters.hpp"
 
namespace nav2_util
{
 
 
std::string sanitize_node_name(const std::string & potential_node_name);
 
 
std::string add_namespaces(const std::string & top_ns, const std::string & sub_ns = "");
 
 
std::string generate_internal_node_name(const std::string & prefix = "");
 
 
rclcpp::Node::SharedPtr generate_internal_node(const std::string & prefix = "");
 
 
std::string time_to_string(size_t len);
 
using ParameterDescriptor = rcl_interfaces::msg::ParameterDescriptor;
 
/* Declares static ROS2 parameter and sets it to a given value
 * if it was not already declared.
 *
 * \param[in] node A node in which given parameter to be declared
 * \param[in] parameter_name The name of parameter
 * \param[in] default_value Parameter value to initialize with
 * \param[in] parameter_descriptor Parameter descriptor (optional)
 */
template<typename NodeT>
void declare_parameter_if_not_declared(
  NodeT node,
  const std::string & parameter_name,
  const rclcpp::ParameterValue & default_value,
  const ParameterDescriptor & parameter_descriptor = ParameterDescriptor())
{
  if (!node->has_parameter(parameter_name)) {
    node->declare_parameter(parameter_name, default_value, parameter_descriptor);
  }
}
 
/* Declares static ROS2 parameter with given type if it was not already declared.
 *
 * \param[in] node A node in which given parameter to be declared
 * \param[in] parameter_name Name of the parameter
 * \param[in] param_type The type of parameter
 * \param[in] parameter_descriptor Parameter descriptor (optional)
 */
template<typename NodeT>
void declare_parameter_if_not_declared(
  NodeT node,
  const std::string & parameter_name,
  const rclcpp::ParameterType & param_type,
  const ParameterDescriptor & parameter_descriptor = ParameterDescriptor())
{
  if (!node->has_parameter(parameter_name)) {
    node->declare_parameter(parameter_name, param_type, parameter_descriptor);
  }
}
 
/* Declares a parameter with the specified type if it was not already declared.
 * If the parameter was overridden, its value is returned, otherwise an
 * rclcpp::exceptions::InvalidParameterValueException is thrown
 *
 * \param[in] node A node in which given parameter to be declared
 * \param[in] parameter_name Name of the parameter
 * \param[in] param_type The type of parameter
 * \param[in] parameter_descriptor Parameter descriptor (optional)
 * \return The value of the parameter or an exception
 */
template<typename ParameterT, typename NodeT>
ParameterT declare_or_get_parameter(
  NodeT node,
  const std::string & parameter_name,
  const rclcpp::ParameterType & param_type,
  const ParameterDescriptor & parameter_descriptor = ParameterDescriptor())
{
  if (node->has_parameter(parameter_name)) {
    return node->get_parameter(parameter_name).template get_value<ParameterT>();
  }
  auto parameter = node->declare_parameter(parameter_name, param_type, parameter_descriptor);
  if (parameter.get_type() == rclcpp::ParameterType::PARAMETER_NOT_SET) {
    std::string description = "Parameter " + parameter_name + " not in overrides";
    throw rclcpp::exceptions::InvalidParameterValueException(description.c_str());
  }
  return parameter.template get<ParameterT>();
}
 
using NodeParamInterfacePtr = rclcpp::node_interfaces::NodeParametersInterface::SharedPtr;
 
 
template<typename ParamType>
ParamType declare_or_get_parameter(
  const rclcpp::Logger & logger, NodeParamInterfacePtr param_interface,
  const std::string & parameter_name, const ParamType & default_value,
  bool warn_if_no_override = false, bool strict_param_loading = false,
  const ParameterDescriptor & parameter_descriptor = ParameterDescriptor())
{
  if (param_interface->has_parameter(parameter_name)) {
    rclcpp::Parameter param(parameter_name, default_value);
    param_interface->get_parameter(parameter_name, param);
    return param.get_value<ParamType>();
  }
 
  auto return_value = param_interface
    ->declare_parameter(parameter_name, rclcpp::ParameterValue{default_value},
      parameter_descriptor)
    .get<ParamType>();
 
  const bool no_param_override = param_interface->get_parameter_overrides().find(parameter_name) ==
    param_interface->get_parameter_overrides().end();
  if (no_param_override) {
    if (warn_if_no_override) {
      RCLCPP_WARN_STREAM(
            logger,
            "Failed to get param " << parameter_name << " from overrides, using default value.");
    }
    if (strict_param_loading) {
      std::string description = "Parameter " + parameter_name +
        " not in overrides and strict_param_loading is True";
      throw rclcpp::exceptions::InvalidParameterValueException(description.c_str());
    }
  }
 
  return return_value;
}
 
 
template<typename ParamType, typename NodeT>
ParamType declare_or_get_parameter(
  NodeT node, const std::string & parameter_name,
  const ParamType & default_value,
  const ParameterDescriptor & parameter_descriptor = ParameterDescriptor())
{
  declare_parameter_if_not_declared(node, "warn_on_missing_params", rclcpp::ParameterValue(false));
  bool warn_if_no_override{false};
  node->get_parameter("warn_on_missing_params", warn_if_no_override);
  declare_parameter_if_not_declared(node, "strict_param_loading", rclcpp::ParameterValue(false));
  bool strict_param_loading{false};
  node->get_parameter("strict_param_loading", strict_param_loading);
  return declare_or_get_parameter(node->get_logger(), node->get_node_parameters_interface(),
    parameter_name, default_value, warn_if_no_override, strict_param_loading, parameter_descriptor);
}
 
 
template<typename NodeT>
std::string get_plugin_type_param(
  NodeT node,
  const std::string & plugin_name)
{
  declare_parameter_if_not_declared(node, plugin_name + ".plugin", rclcpp::PARAMETER_STRING);
  std::string plugin_type;
  try {
    if (!node->get_parameter(plugin_name + ".plugin", plugin_type)) {
      RCLCPP_FATAL(
        node->get_logger(), "Can not get 'plugin' param value for %s", plugin_name.c_str());
      throw std::runtime_error("No 'plugin' param for param ns!");
    }
  } catch (rclcpp::exceptions::ParameterUninitializedException & ex) {
    RCLCPP_FATAL(node->get_logger(), "'plugin' param not defined for %s", plugin_name.c_str());
    throw std::runtime_error("No 'plugin' param for param ns!");
  }
 
  return plugin_type;
}
 
void setSoftRealTimePriority();
 
}  // namespace nav2_util
 
#endif  // NAV2_UTIL__NODE_UTILS_HPP_