is_path_valid_condition.cpp

// Copyright (c) 2021 Joshua Wallace
//
// 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_behavior_tree/plugins/condition/is_path_valid_condition.hpp"
#include <chrono>
#include <memory>
#include <string>
 
namespace nav2_behavior_tree
{
 
IsPathValidCondition::IsPathValidCondition(
  const std::string & condition_name,
  const BT::NodeConfiguration & conf)
: BT::ConditionNode(condition_name, conf),
  max_cost_(254), consider_unknown_as_obstacle_(false)
{
  node_ = config().blackboard->get<nav2::LifecycleNode::SharedPtr>("node");
  client_ =
    node_->create_client<nav2_msgs::srv::IsPathValid>(
    "is_path_valid",
    false /* Does not create and spin an internal executor*/);
 
  server_timeout_ = config().blackboard->template get<std::chrono::milliseconds>("server_timeout");
}
 
void IsPathValidCondition::initialize()
{
  getInput<std::chrono::milliseconds>("server_timeout", server_timeout_);
  getInput<unsigned int>("max_cost", max_cost_);
  getInput<bool>("consider_unknown_as_obstacle", consider_unknown_as_obstacle_);
}
 
BT::NodeStatus IsPathValidCondition::tick()
{
  if (!BT::isStatusActive(status())) {
    initialize();
  }
 
  nav_msgs::msg::Path path;
  getInput("path", path);
 
  auto request = std::make_shared<nav2_msgs::srv::IsPathValid::Request>();
 
  request->path = path;
  request->max_cost = max_cost_;
  request->consider_unknown_as_obstacle = consider_unknown_as_obstacle_;
  auto response = client_->invoke(request, server_timeout_);
  if (response->is_valid) {
    return BT::NodeStatus::SUCCESS;
  }
  return BT::NodeStatus::FAILURE;
}
 
}  // namespace nav2_behavior_tree
 
#include "behaviortree_cpp/bt_factory.h"
BT_REGISTER_NODES(factory)
{
  factory.registerNodeType<nav2_behavior_tree::IsPathValidCondition>("IsPathValid");
}