route_operation_client.hpp

// Copyright (c) 2025 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_ROUTE__PLUGINS__ROUTE_OPERATION_CLIENT_HPP_
#define NAV2_ROUTE__PLUGINS__ROUTE_OPERATION_CLIENT_HPP_
 
#include <memory>
#include <chrono>
#include <string>
 
#include "rclcpp/rclcpp.hpp"
#include "rclcpp_lifecycle/lifecycle_node.hpp"
#include "nav2_route/interfaces/route_operation.hpp"
#include "nav2_core/route_exceptions.hpp"
#include "nav2_util/node_utils.hpp"
#include "std_srvs/srv/trigger.hpp"
 
namespace nav2_route
{
 
using namespace std::chrono_literals;  // NOLINT
 
template<typename SrvT>
class RouteOperationClient : public RouteOperation
{
public:
  RouteOperationClient() = default;
 
  virtual ~RouteOperationClient() = default;
 
  virtual void configureEvent(
    const rclcpp_lifecycle::LifecycleNode::SharedPtr /*node*/,
    const std::string & /*name*/) {}
 
  virtual void populateRequest(
    std::shared_ptr<typename SrvT::Request>/*request*/, const Metadata * /*mdata*/) {}
 
  virtual OperationResult processResponse(
    std::shared_ptr<typename SrvT::Response>/*response*/) {return OperationResult();}
 
protected:
  void configure(
    const rclcpp_lifecycle::LifecycleNode::SharedPtr node,
    std::shared_ptr<nav2_costmap_2d::CostmapSubscriber>,
    const std::string & name) final
  {
    RCLCPP_INFO(node->get_logger(), "Configuring route operation client: %s.", name.c_str());
    name_ = name;
    logger_ = node->get_logger();
    node_ = node;
    callback_group_ = node->create_callback_group(
      rclcpp::CallbackGroupType::MutuallyExclusive,
      false);
    callback_group_executor_.add_callback_group(callback_group_, node->get_node_base_interface());
 
    nav2_util::declare_parameter_if_not_declared(
      node, getName() + ".service_name", rclcpp::ParameterValue(""));
    main_srv_name_ = node->get_parameter(getName() + ".service_name").as_string();
 
    configureEvent(node, name);
 
    // There exists a single central service to use, create client.
    // If this is set to empty string after configuration, then the individual nodes will
    // indicate the endpoint for the particular service call.
    if (!main_srv_name_.empty()) {
      main_client_ = node->create_client<SrvT>(
        main_srv_name_, rclcpp::SystemDefaultsQoS(), callback_group_);
    }
  }
 
  OperationResult perform(
    NodePtr node_achieved,
    EdgePtr /*edge_entered*/,
    EdgePtr /*edge_exited*/,
    const Route & /*route*/,
    const geometry_msgs::msg::PoseStamped & /*curr_pose*/,
    const Metadata * mdata) final
  {
    auto req = std::make_shared<typename SrvT::Request>();
    std::shared_ptr<typename SrvT::Response> response;
    populateRequest(req, mdata);
 
    std::string srv_name;
    srv_name = mdata->getValue<std::string>("service_name", srv_name);
    if (srv_name.empty() && !main_client_) {
      throw nav2_core::OperationFailed(
              "Route operation service (" + getName() + ") needs 'server_name' "
              "set in the param file or in the operation's metadata!");
    }
 
    if (srv_name.empty()) {
      srv_name = main_srv_name_;
      response = callService(main_client_, req);
    } else {
      auto node = node_.lock();
      auto client = node->create_client<SrvT>(
        srv_name, rclcpp::SystemDefaultsQoS(), callback_group_);
      response = callService(client, req);
    }
 
    RCLCPP_INFO(
      logger_,
      "%s: Processed operation at Node %i with service %s.",
      name_.c_str(), node_achieved->nodeid, srv_name.c_str());
    return processResponse(response);
  }
 
  std::shared_ptr<typename SrvT::Response> callService(
    typename rclcpp::Client<SrvT>::SharedPtr client,
    std::shared_ptr<typename SrvT::Request> req,
    const std::chrono::nanoseconds timeout = std::chrono::nanoseconds(500ms))
  {
    auto node = node_.lock();
    if (!client->wait_for_service(1s)) {
      throw nav2_core::OperationFailed(
              "Route operation service " +
              std::string(client->get_service_name()) + " is not available!");
    }
 
    auto result = client->async_send_request(req);
    if (callback_group_executor_.spin_until_future_complete(result, timeout) !=
      rclcpp::FutureReturnCode::SUCCESS)
    {
      throw nav2_core::OperationFailed(
              "Route operation service " +
              std::string(client->get_service_name()) + " failed to call!");
    }
 
    return result.get();
  }
 
  std::string getName() override {return name_;}
 
  RouteOperationType processType() final {return RouteOperationType::ON_GRAPH;}
 
  std::string name_, main_srv_name_;
  std::atomic_bool reroute_;
  rclcpp::Logger logger_{rclcpp::get_logger("RouteOperationClient")};
  typename rclcpp::Client<SrvT>::SharedPtr main_client_;
  rclcpp_lifecycle::LifecycleNode::WeakPtr node_;
  rclcpp::CallbackGroup::SharedPtr callback_group_;
  rclcpp::executors::SingleThreadedExecutor callback_group_executor_;
};
 
}  // namespace nav2_route
 
#endif  // NAV2_ROUTE__PLUGINS__ROUTE_OPERATION_CLIENT_HPP_