21.0.3

Signed-off-by: Yadunund <yadunund@openrobotics.org>

rclcpp/CHANGELOG.rst

@@ -2,6 +2,23 @@
 Changelog for package rclcpp
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
+21.0.3 (2023-09-08)
+-------------------
+* Do not crash Executor when send_response fails due to client failure. (`#2279 <https://github.com/ros2/rclcpp/issues/2279>`_)
+* Add new node interface TypeDescriptionsInterface to provide GetTypeDescription service (`#2236 <https://github.com/ros2/rclcpp/issues/2236>`_)
+* Contributors: Emerson Knapp, Tomoya Fujita, Zang MingJie
+
+21.0.2 (2023-07-14)
+-------------------
+* Fix warnings related to comparison of integer expressions of different signedness (`#2222 <https://github.com/ros2/rclcpp/issues/2222>`_)
+* Fix race condition in events-executor (`#2191 <https://github.com/ros2/rclcpp/issues/2191>`_)
+* Contributors: Alberto Soragna, Tomoya Fujita
+
+21.0.1 (2023-05-11)
+-------------------
+* Fix delivered message kind (`#2175 <https://github.com/ros2/rclcpp/issues/2175>`_) (`#2178 <https://github.com/ros2/rclcpp/issues/2178>`_)
+* Contributors: mergify[bot]
+
 21.0.0 (2023-04-18)
 -------------------
 * Add support for logging service. (`#2122 <https://github.com/ros2/rclcpp/issues/2122>`_)

rclcpp/CMakeLists.txt

@@ -92,6 +92,7 @@ set(${PROJECT_NAME}_SRCS
   src/rclcpp/node_interfaces/node_time_source.cpp
   src/rclcpp/node_interfaces/node_timers.cpp
   src/rclcpp/node_interfaces/node_topics.cpp
+  src/rclcpp/node_interfaces/node_type_descriptions.cpp
   src/rclcpp/node_interfaces/node_waitables.cpp
   src/rclcpp/node_options.cpp
   src/rclcpp/parameter.cpp

rclcpp/include/rclcpp/experimental/executors/events_executor/events_executor.hpp

@@ -243,6 +243,11 @@ private:
   std::function<void(size_t, int)>
   create_waitable_callback(const rclcpp::Waitable * waitable_id);
 
+  /// Utility to add the notify waitable to an entities collection
+  void
+  add_notify_waitable_to_collection(
+    rclcpp::executors::ExecutorEntitiesCollection::WaitableCollection & collection);
+
   /// Searches for the provided entity_id in the collection and returns the entity if valid
   template<typename CollectionType>
   typename CollectionType::EntitySharedPtr

rclcpp/include/rclcpp/node.hpp

@@ -56,6 +56,7 @@
 #include "rclcpp/node_interfaces/node_time_source_interface.hpp"
 #include "rclcpp/node_interfaces/node_timers_interface.hpp"
 #include "rclcpp/node_interfaces/node_topics_interface.hpp"
+#include "rclcpp/node_interfaces/node_type_descriptions_interface.hpp"
 #include "rclcpp/node_interfaces/node_waitables_interface.hpp"
 #include "rclcpp/node_options.hpp"
 #include "rclcpp/parameter.hpp"
@@ -1454,6 +1455,11 @@ public:
   rclcpp::node_interfaces::NodeTimeSourceInterface::SharedPtr
   get_node_time_source_interface();
 
+  /// Return the Node's internal NodeTypeDescriptionsInterface implementation.
+  RCLCPP_PUBLIC
+  rclcpp::node_interfaces::NodeTypeDescriptionsInterface::SharedPtr
+  get_node_type_descriptions_interface();
+
   /// Return the sub-namespace, if this is a sub-node, otherwise an empty string.
   /**
    * The returned sub-namespace is either the accumulated sub-namespaces which
@@ -1591,6 +1597,11 @@ private:
   const rclcpp::NodeOptions node_options_;
   const std::string sub_namespace_;
   const std::string effective_namespace_;
+
+  /// Static map(s) containing extra member variables for Node without changing its ABI.
+  // See node.cpp for more details.
+  class BackportMembers;
+  static BackportMembers backport_members_;
 };
 
 }  // namespace rclcpp

rclcpp/include/rclcpp/node_interfaces/node_interfaces.hpp

@@ -30,6 +30,7 @@
   rclcpp::node_interfaces::NodeTimeSourceInterface, \
   rclcpp::node_interfaces::NodeTimersInterface, \
   rclcpp::node_interfaces::NodeTopicsInterface, \
+  rclcpp::node_interfaces::NodeTypeDescriptionsInterface, \
   rclcpp::node_interfaces::NodeWaitablesInterface
 
 
@@ -118,6 +119,7 @@ public:
    *   - rclcpp::node_interfaces::NodeTimeSourceInterface
    *   - rclcpp::node_interfaces::NodeTimersInterface
    *   - rclcpp::node_interfaces::NodeTopicsInterface
+   *   - rclcpp::node_interfaces::NodeTypeDescriptionsInterface
    *   - rclcpp::node_interfaces::NodeWaitablesInterface
    *
    * Or you use custom interfaces as long as you make a template specialization

rclcpp/include/rclcpp/node_interfaces/node_type_descriptions.hpp

@@ -0,0 +1,63 @@
+// Copyright 2023 Open Source Robotics Foundation, Inc.
+//
+// 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 RCLCPP__NODE_INTERFACES__NODE_TYPE_DESCRIPTIONS_HPP_
+#define RCLCPP__NODE_INTERFACES__NODE_TYPE_DESCRIPTIONS_HPP_
+
+#include <memory>
+
+#include "rclcpp/macros.hpp"
+#include "rclcpp/node_interfaces/node_base_interface.hpp"
+#include "rclcpp/node_interfaces/node_logging_interface.hpp"
+#include "rclcpp/node_interfaces/node_parameters_interface.hpp"
+#include "rclcpp/node_interfaces/node_services_interface.hpp"
+#include "rclcpp/node_interfaces/node_topics_interface.hpp"
+#include "rclcpp/node_interfaces/node_type_descriptions_interface.hpp"
+#include "rclcpp/visibility_control.hpp"
+
+namespace rclcpp
+{
+namespace node_interfaces
+{
+
+/// Implementation of the NodeTypeDescriptions part of the Node API.
+class NodeTypeDescriptions : public NodeTypeDescriptionsInterface
+{
+public:
+  RCLCPP_SMART_PTR_ALIASES_ONLY(NodeTypeDescriptions)
+
+  RCLCPP_PUBLIC
+  explicit NodeTypeDescriptions(
+    NodeBaseInterface::SharedPtr node_base,
+    NodeLoggingInterface::SharedPtr node_logging,
+    NodeParametersInterface::SharedPtr node_parameters,
+    NodeServicesInterface::SharedPtr node_services);
+
+  RCLCPP_PUBLIC
+  virtual
+  ~NodeTypeDescriptions();
+
+private:
+  RCLCPP_DISABLE_COPY(NodeTypeDescriptions)
+
+  // Pimpl hides helper types and functions used for wrapping a C service, which would be
+  // awkward to expose in this header.
+  class NodeTypeDescriptionsImpl;
+  std::unique_ptr<NodeTypeDescriptionsImpl> impl_;
+};
+
+}  // namespace node_interfaces
+}  // namespace rclcpp
+
+#endif  // RCLCPP__NODE_INTERFACES__NODE_TYPE_DESCRIPTIONS_HPP_

rclcpp/include/rclcpp/node_interfaces/node_type_descriptions_interface.hpp

@@ -0,0 +1,44 @@
+// Copyright 2023 Open Source Robotics Foundation, Inc.
+//
+// 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 RCLCPP__NODE_INTERFACES__NODE_TYPE_DESCRIPTIONS_INTERFACE_HPP_
+#define RCLCPP__NODE_INTERFACES__NODE_TYPE_DESCRIPTIONS_INTERFACE_HPP_
+
+#include "rclcpp/macros.hpp"
+#include "rclcpp/node_interfaces/detail/node_interfaces_helpers.hpp"
+#include "rclcpp/visibility_control.hpp"
+
+namespace rclcpp
+{
+namespace node_interfaces
+{
+
+/// Pure virtual interface class for the NodeTypeDescriptions part of the Node API.
+class NodeTypeDescriptionsInterface
+{
+public:
+  RCLCPP_SMART_PTR_ALIASES_ONLY(NodeTypeDescriptionsInterface)
+
+  RCLCPP_PUBLIC
+  virtual
+  ~NodeTypeDescriptionsInterface() = default;
+};
+
+}  // namespace node_interfaces
+}  // namespace rclcpp
+
+RCLCPP_NODE_INTERFACE_HELPERS_SUPPORT(
+  rclcpp::node_interfaces::NodeTypeDescriptionsInterface, type_descriptions)
+
+#endif  // RCLCPP__NODE_INTERFACES__NODE_TYPE_DESCRIPTIONS_INTERFACE_HPP_

rclcpp/include/rclcpp/service.hpp

@@ -482,6 +482,14 @@ public:
   {
     rcl_ret_t ret = rcl_send_response(get_service_handle().get(), &req_id, &response);
 
+    if (ret == RCL_RET_TIMEOUT) {
+      RCLCPP_WARN(
+        node_logger_.get_child("rclcpp"),
+        "failed to send response to %s (timeout): %s",
+        this->get_service_name(), rcl_get_error_string().str);
+      rcl_reset_error();
+      return;
+    }
     if (ret != RCL_RET_OK) {
       rclcpp::exceptions::throw_from_rcl_error(ret, "failed to send response");
     }

rclcpp/include/rclcpp/subscription_base.hpp

@@ -260,13 +260,13 @@ public:
   bool
   is_serialized() const;
 
-  /// Return the type of the subscription.
+  /// Return the delivered message kind.
   /**
    * \return `DeliveredMessageKind`, which adjusts how messages are received and delivered.
    */
   RCLCPP_PUBLIC
   DeliveredMessageKind
-  get_subscription_type() const;
+  get_delivered_message_kind() const;
 
   /// Get matching publisher count.
   /** \return The number of publishers on this topic. */
@@ -663,7 +663,7 @@ private:
   RCLCPP_DISABLE_COPY(SubscriptionBase)
 
   rosidl_message_type_support_t type_support_;
-  DeliveredMessageKind delivered_message_type_;
+  DeliveredMessageKind delivered_message_kind_;
 
   std::atomic<bool> subscription_in_use_by_wait_set_{false};
   std::atomic<bool> intra_process_subscription_waitable_in_use_by_wait_set_{false};

rclcpp/package.xml

@@ -2,7 +2,7 @@
 <?xml-model href="http://download.ros.org/schema/package_format2.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
 <package format="2">
   <name>rclcpp</name>
-  <version>21.0.0</version>
+  <version>21.0.3</version>
   <description>The ROS client library in C++.</description>
 
   <maintainer email="ivanpauno@ekumenlabs.com">Ivan Paunovic</maintainer>

rclcpp/src/rclcpp/executor.cpp

@@ -603,7 +603,7 @@ Executor::execute_subscription(rclcpp::SubscriptionBase::SharedPtr subscription)
   rclcpp::MessageInfo message_info;
   message_info.get_rmw_message_info().from_intra_process = false;
 
-  switch (subscription->get_subscription_type()) {
+  switch (subscription->get_delivered_message_kind()) {
     // Deliver ROS message
     case rclcpp::DeliveredMessageKind::ROS_MESSAGE:
       {

rclcpp/src/rclcpp/experimental/executors/events_executor/events_executor.cpp

@@ -50,6 +50,9 @@ EventsExecutor::EventsExecutor(
   timers_manager_ =
     std::make_shared<rclcpp::experimental::TimersManager>(context_, timer_on_ready_cb);
 
+  this->current_entities_collection_ =
+    std::make_shared<rclcpp::executors::ExecutorEntitiesCollection>();
+
   notify_waitable_ = std::make_shared<rclcpp::executors::ExecutorNotifyWaitable>(
     [this]() {
       // This callback is invoked when:
@@ -61,6 +64,10 @@ EventsExecutor::EventsExecutor(
       this->refresh_current_collection_from_callback_groups();
     });
 
+  // Make sure that the notify waitable is immediately added to the collection
+  // to avoid missing events
+  this->add_notify_waitable_to_collection(current_entities_collection_->waitables);
+
   notify_waitable_->add_guard_condition(interrupt_guard_condition_);
   notify_waitable_->add_guard_condition(shutdown_guard_condition_);
 
@@ -87,9 +94,6 @@ EventsExecutor::EventsExecutor(
 
   this->entities_collector_ =
     std::make_shared<rclcpp::executors::ExecutorEntitiesCollector>(notify_waitable_);
-
-  this->current_entities_collection_ =
-    std::make_shared<rclcpp::executors::ExecutorEntitiesCollection>();
 }
 
 EventsExecutor::~EventsExecutor()
@@ -395,18 +399,8 @@ EventsExecutor::refresh_current_collection_from_callback_groups()
   // retrieved in the "standard" way.
   // To do it, we need to add the notify waitable as an entry in both the new and
   // current collections such that it's neither added or removed.
-  rclcpp::CallbackGroup::WeakPtr weak_group_ptr;
-  new_collection.waitables.insert(
-  {
-    this->notify_waitable_.get(),
-    {this->notify_waitable_, weak_group_ptr}
-  });
-
-  this->current_entities_collection_->waitables.insert(
-  {
-    this->notify_waitable_.get(),
-    {this->notify_waitable_, weak_group_ptr}
-  });
+  this->add_notify_waitable_to_collection(new_collection.waitables);
+  this->add_notify_waitable_to_collection(current_entities_collection_->waitables);
 
   this->refresh_current_collection(new_collection);
 }
@@ -486,3 +480,16 @@ EventsExecutor::create_waitable_callback(const rclcpp::Waitable * entity_key)
     };
   return callback;
 }
+
+void
+EventsExecutor::add_notify_waitable_to_collection(
+  rclcpp::executors::ExecutorEntitiesCollection::WaitableCollection & collection)
+{
+  // The notify waitable is not associated to any group, so use an invalid one
+  rclcpp::CallbackGroup::WeakPtr weak_group_ptr;
+  collection.insert(
+  {
+    this->notify_waitable_.get(),
+    {this->notify_waitable_, weak_group_ptr}
+  });
+}

rclcpp/src/rclcpp/node.cpp

@@ -17,7 +17,10 @@
 #include <limits>
 #include <map>
 #include <memory>
+#include <mutex>
+#include <shared_mutex>
 #include <string>
+#include <unordered_map>
 #include <utility>
 #include <vector>
 
@@ -36,6 +39,7 @@
 #include "rclcpp/node_interfaces/node_time_source.hpp"
 #include "rclcpp/node_interfaces/node_timers.hpp"
 #include "rclcpp/node_interfaces/node_topics.hpp"
+#include "rclcpp/node_interfaces/node_type_descriptions.hpp"
 #include "rclcpp/node_interfaces/node_waitables.hpp"
 #include "rclcpp/qos_overriding_options.hpp"
 
@@ -109,6 +113,72 @@ create_effective_namespace(const std::string & node_namespace, const std::string
 
 }  // namespace
 
+/// \brief Associate new extra member variables with instances of Node without changing ABI.
+/**
+ * It is used only for bugfixes or backported features that require new members.
+ * Atomically constructs/destroys all extra members.
+ * Node instance will register and remove itself, and use its methods to retrieve members.
+ * Note for performance consideration that accessing these members uses a map lookup.
+ */
+class Node::BackportMembers
+{
+public:
+  BackportMembers() = default;
+  ~BackportMembers() = default;
+
+  /// \brief Add all backported members for a new Node.
+  /**
+   * \param[in] key Raw pointer to the Node instance that will use new members.
+   */
+  void add(Node * key)
+  {
+    // Adding a new instance to the maps requires exclusive access
+    std::unique_lock lock(map_access_mutex_);
+    type_descriptions_map_.emplace(
+      key,
+      std::make_shared<rclcpp::node_interfaces::NodeTypeDescriptions>(
+        key->get_node_base_interface(),
+        key->get_node_logging_interface(),
+        key->get_node_parameters_interface(),
+        key->get_node_services_interface()));
+  }
+
+  /// \brief Remove the members for an instance of Node
+  /**
+   * \param[in] key Raw pointer to the Node
+   */
+  void remove(const Node * key)
+  {
+    // Removing an instance from the maps requires exclusive access
+    std::unique_lock lock(map_access_mutex_);
+    type_descriptions_map_.erase(key);
+  }
+
+  /// \brief Retrieve the NodeTypeDescriptionsInterface for a Node.
+  /**
+   * \param[in] key Raw pointer to an instance of Node.
+   * \return A shared ptr to this Node's NodeTypeDescriptionsInterface instance.
+   */
+  rclcpp::node_interfaces::NodeTypeDescriptionsInterface::SharedPtr
+  get_node_type_descriptions_interface(const Node * key) const
+  {
+    // Multiple threads can retrieve from the maps at the same time
+    std::shared_lock lock(map_access_mutex_);
+    return type_descriptions_map_.at(key);
+  }
+
+private:
+  /// \brief Map that stored TypeDescriptionsInterface members
+  std::unordered_map<
+    const Node *, rclcpp::node_interfaces::NodeTypeDescriptionsInterface::SharedPtr
+  > type_descriptions_map_;
+
+  /// \brief Controls access to all private maps
+  mutable std::shared_mutex map_access_mutex_;
+};
+// Definition of static member declaration
+Node::BackportMembers Node::backport_members_;
+
 Node::Node(
   const std::string & node_name,
   const NodeOptions & options)
@@ -211,6 +281,8 @@ Node::Node(
   sub_namespace_(""),
   effective_namespace_(create_effective_namespace(this->get_namespace(), sub_namespace_))
 {
+  backport_members_.add(this);
+
   // we have got what we wanted directly from the overrides,
   // but declare the parameters anyway so they are visible.
   rclcpp::detail::declare_qos_parameters(
@@ -272,6 +344,7 @@ Node::Node(
 Node::~Node()
 {
   // release sub-interfaces in an order that allows them to consult with node_base during tear-down
+  backport_members_.remove(this);
   node_waitables_.reset();
   node_time_source_.reset();
   node_parameters_.reset();
@@ -591,6 +664,12 @@ Node::get_node_topics_interface()
   return node_topics_;
 }
 
+rclcpp::node_interfaces::NodeTypeDescriptionsInterface::SharedPtr
+Node::get_node_type_descriptions_interface()
+{
+  return backport_members_.get_node_type_descriptions_interface(this);
+}
+
 rclcpp::node_interfaces::NodeServicesInterface::SharedPtr
 Node::get_node_services_interface()
 {

rclcpp/src/rclcpp/node_interfaces/node_type_descriptions.cpp

@@ -0,0 +1,157 @@
+// Copyright 2023 Open Source Robotics Foundation, Inc.
+//
+// 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 <memory>
+#include <string>
+#include <thread>
+
+#include "rclcpp/node_interfaces/node_type_descriptions.hpp"
+#include "rclcpp/parameter_client.hpp"
+
+#include "type_description_interfaces/srv/get_type_description.h"
+
+namespace
+{
+// Helper wrapper for rclcpp::Service to access ::Request and ::Response types for allocation.
+struct GetTypeDescription__C
+{
+  using Request = type_description_interfaces__srv__GetTypeDescription_Request;
+  using Response = type_description_interfaces__srv__GetTypeDescription_Response;
+  using Event = type_description_interfaces__srv__GetTypeDescription_Event;
+};
+}  // namespace
+
+// Helper function for C typesupport.
+namespace rosidl_typesupport_cpp
+{
+template<>
+rosidl_service_type_support_t const *
+get_service_type_support_handle<GetTypeDescription__C>()
+{
+  return ROSIDL_GET_SRV_TYPE_SUPPORT(type_description_interfaces, srv, GetTypeDescription);
+}
+}  // namespace rosidl_typesupport_cpp
+
+namespace rclcpp
+{
+namespace node_interfaces
+{
+
+class NodeTypeDescriptions::NodeTypeDescriptionsImpl
+{
+public:
+  using ServiceT = GetTypeDescription__C;
+
+  rclcpp::Logger logger_;
+  rclcpp::node_interfaces::NodeBaseInterface::SharedPtr node_base_;
+  rclcpp::Service<ServiceT>::SharedPtr type_description_srv_;
+
+  NodeTypeDescriptionsImpl(
+    rclcpp::node_interfaces::NodeBaseInterface::SharedPtr node_base,
+    rclcpp::node_interfaces::NodeLoggingInterface::SharedPtr node_logging,
+    rclcpp::node_interfaces::NodeParametersInterface::SharedPtr node_parameters,
+    rclcpp::node_interfaces::NodeServicesInterface::SharedPtr node_services)
+  : logger_(node_logging->get_logger()),
+    node_base_(node_base)
+  {
+    const std::string enable_param_name = "start_type_description_service";
+
+    bool enabled = false;
+    try {
+      auto enable_param = node_parameters->declare_parameter(
+        enable_param_name,
+        rclcpp::ParameterValue(true),
+        rcl_interfaces::msg::ParameterDescriptor()
+        .set__name(enable_param_name)
+        .set__type(rclcpp::PARAMETER_BOOL)
+        .set__description("Start the ~/get_type_description service for this node.")
+        .set__read_only(true));
+      enabled = enable_param.get<bool>();
+    } catch (const rclcpp::exceptions::InvalidParameterTypeException & exc) {
+      RCLCPP_ERROR(logger_, "%s", exc.what());
+      throw;
+    }
+
+    if (enabled) {
+      auto rcl_node = node_base->get_rcl_node_handle();
+      rcl_ret_t rcl_ret = rcl_node_type_description_service_init(rcl_node);
+      if (rcl_ret != RCL_RET_OK) {
+        RCLCPP_ERROR(
+          logger_, "Failed to initialize ~/get_type_description_service: %s",
+          rcl_get_error_string().str);
+        throw std::runtime_error(
+                "Failed to initialize ~/get_type_description service.");
+      }
+
+      rcl_service_t * rcl_srv = nullptr;
+      rcl_ret = rcl_node_get_type_description_service(rcl_node, &rcl_srv);
+      if (rcl_ret != RCL_RET_OK) {
+        throw std::runtime_error(
+                "Failed to get initialized ~/get_type_description service from rcl.");
+      }
+
+      rclcpp::AnyServiceCallback<ServiceT> cb;
+      cb.set(
+        [this](
+          std::shared_ptr<rmw_request_id_t> header,
+          std::shared_ptr<ServiceT::Request> request,
+          std::shared_ptr<ServiceT::Response> response
+        ) {
+          rcl_node_type_description_service_handle_request(
+            node_base_->get_rcl_node_handle(),
+            header.get(),
+            request.get(),
+            response.get());
+        });
+
+      type_description_srv_ = std::make_shared<Service<ServiceT>>(
+        node_base_->get_shared_rcl_node_handle(),
+        rcl_srv,
+        cb);
+      node_services->add_service(
+        std::dynamic_pointer_cast<ServiceBase>(type_description_srv_),
+        nullptr);
+    }
+  }
+
+  ~NodeTypeDescriptionsImpl()
+  {
+    if (
+      type_description_srv_ &&
+      RCL_RET_OK != rcl_node_type_description_service_fini(node_base_->get_rcl_node_handle()))
+    {
+      RCLCPP_ERROR(
+        logger_,
+        "Error in shutdown of get_type_description service: %s", rcl_get_error_string().str);
+    }
+  }
+};
+
+NodeTypeDescriptions::NodeTypeDescriptions(
+  rclcpp::node_interfaces::NodeBaseInterface::SharedPtr node_base,
+  rclcpp::node_interfaces::NodeLoggingInterface::SharedPtr node_logging,
+  rclcpp::node_interfaces::NodeParametersInterface::SharedPtr node_parameters,
+  rclcpp::node_interfaces::NodeServicesInterface::SharedPtr node_services)
+: impl_(new NodeTypeDescriptionsImpl(
+      node_base,
+      node_logging,
+      node_parameters,
+      node_services))
+{}
+
+NodeTypeDescriptions::~NodeTypeDescriptions()
+{}
+
+}  // namespace node_interfaces
+}  // namespace rclcpp

rclcpp/src/rclcpp/subscription_base.cpp

@@ -52,7 +52,7 @@ SubscriptionBase::SubscriptionBase(
   intra_process_subscription_id_(0),
   event_callbacks_(event_callbacks),
   type_support_(type_support_handle),
-  delivered_message_type_(delivered_message_kind)
+  delivered_message_kind_(delivered_message_kind)
 {
   auto custom_deletor = [node_handle = this->node_handle_](rcl_subscription_t * rcl_subs)
     {
@@ -261,13 +261,13 @@ SubscriptionBase::get_message_type_support_handle() const
 bool
 SubscriptionBase::is_serialized() const
 {
-  return delivered_message_type_ == rclcpp::DeliveredMessageKind::SERIALIZED_MESSAGE;
+  return delivered_message_kind_ == rclcpp::DeliveredMessageKind::SERIALIZED_MESSAGE;
 }
 
 rclcpp::DeliveredMessageKind
-SubscriptionBase::get_subscription_type() const
+SubscriptionBase::get_delivered_message_kind() const
 {
-  return delivered_message_type_;
+  return delivered_message_kind_;
 }
 
 size_t

rclcpp/test/rclcpp/CMakeLists.txt

@@ -262,6 +262,11 @@ if(TARGET test_node_interfaces__node_topics)
     "test_msgs")
   target_link_libraries(test_node_interfaces__node_topics ${PROJECT_NAME} mimick)
 endif()
+ament_add_gtest(test_node_interfaces__node_type_descriptions
+  node_interfaces/test_node_type_descriptions.cpp)
+if(TARGET test_node_interfaces__node_type_descriptions)
+  target_link_libraries(test_node_interfaces__node_type_descriptions ${PROJECT_NAME} mimick)
+endif()
 ament_add_gtest(test_node_interfaces__node_waitables
   node_interfaces/test_node_waitables.cpp)
 if(TARGET test_node_interfaces__node_waitables)

rclcpp/test/rclcpp/executors/test_executors.cpp

@@ -20,12 +20,14 @@
 #include <gtest/gtest.h>
 
 #include <algorithm>
+#include <atomic>
 #include <chrono>
 #include <limits>
 #include <memory>
 #include <string>
 #include <thread>
 #include <utility>
+#include <vector>
 
 #include "rcl/error_handling.h"
 #include "rcl/time.h"
@@ -43,18 +45,10 @@ template<typename T>
 class TestExecutors : public ::testing::Test
 {
 public:
-  static void SetUpTestCase()
-  {
-    rclcpp::init(0, nullptr);
-  }
-
-  static void TearDownTestCase()
-  {
-    rclcpp::shutdown();
-  }
-
   void SetUp()
   {
+    rclcpp::init(0, nullptr);
+
     const auto test_info = ::testing::UnitTest::GetInstance()->current_test_info();
     std::stringstream test_name;
     test_name << test_info->test_case_name() << "_" << test_info->name();
@@ -75,6 +69,8 @@ public:
     publisher.reset();
     subscription.reset();
     node.reset();
+
+    rclcpp::shutdown();
   }
 
   rclcpp::Node::SharedPtr node;
@@ -729,6 +725,77 @@ TYPED_TEST(TestExecutors, testSpinUntilFutureCompleteInterrupted)
   spinner.join();
 }
 
+// This test verifies that the add_node operation is robust wrt race conditions.
+// It's mostly meant to prevent regressions in the events-executor, but the operation should be
+// thread-safe in all executor implementations.
+// The initial implementation of the events-executor contained a bug where the executor
+// would end up in an inconsistent state and stop processing interrupt/shutdown notifications.
+// Manually adding a node to the executor results in a) producing a notify waitable event
+// and b) refreshing the executor collections.
+// The inconsistent state would happen if the event was processed before the collections were
+// finished to be refreshed: the executor would pick up the event but be unable to process it.
+// This would leave the `notify_waitable_event_pushed_` flag to true, preventing additional
+// notify waitable events to be pushed.
+// The behavior is observable only under heavy load, so this test spawns several worker
+// threads. Due to the nature of the bug, this test may still succeed even if the
+// bug is present. However repeated runs will show its flakiness nature and indicate
+// an eventual regression.
+TYPED_TEST(TestExecutors, testRaceConditionAddNode)
+{
+  using ExecutorType = TypeParam;
+  // rmw_connextdds doesn't support events-executor
+  if (
+    std::is_same<ExecutorType, rclcpp::experimental::executors::EventsExecutor>() &&
+    std::string(rmw_get_implementation_identifier()).find("rmw_connextdds") == 0)
+  {
+    GTEST_SKIP();
+  }
+
+  // Spawn some threads to do some heavy work
+  std::atomic<bool> should_cancel = false;
+  std::vector<std::thread> stress_threads;
+  for (size_t i = 0; i < 5 * std::thread::hardware_concurrency(); i++) {
+    stress_threads.emplace_back(
+      [&should_cancel, i]() {
+        // This is just some arbitrary heavy work
+        volatile size_t total = 0;
+        for (size_t k = 0; k < 549528914167; k++) {
+          if (should_cancel) {
+            break;
+          }
+          total += k * (i + 42);
+        }
+      });
+  }
+
+  // Create an executor
+  auto executor = std::make_shared<ExecutorType>();
+  // Start spinning
+  auto executor_thread = std::thread(
+    [executor]() {
+      executor->spin();
+    });
+  // Add a node to the executor
+  executor->add_node(this->node);
+
+  // Cancel the executor (make sure that it's already spinning first)
+  while (!executor->is_spinning() && rclcpp::ok()) {
+    continue;
+  }
+  executor->cancel();
+
+  // Try to join the thread after cancelling the executor
+  // This is the "test". We want to make sure that we can still cancel the executor
+  // regardless of the presence of race conditions
+  executor_thread.join();
+
+  // The test is now completed: we can join the stress threads
+  should_cancel = true;
+  for (auto & t : stress_threads) {
+    t.join();
+  }
+}
+
 // Check spin_until_future_complete with node base pointer (instantiates its own executor)
 TEST(TestExecutors, testSpinUntilFutureCompleteNodeBasePtr)
 {
@@ -791,7 +858,7 @@ public:
     test_name << test_info->test_case_name() << "_" << test_info->name();
     node = std::make_shared<rclcpp::Node>("node", test_name.str());
 
-    callback_count = 0;
+    callback_count = 0u;
 
     const std::string topic_name = std::string("topic_") + test_name.str();
 
@@ -800,7 +867,7 @@ public:
     publisher = node->create_publisher<test_msgs::msg::Empty>(topic_name, rclcpp::QoS(1), po);
 
     auto callback = [this](test_msgs::msg::Empty::ConstSharedPtr) {
-        this->callback_count.fetch_add(1);
+        this->callback_count.fetch_add(1u);
       };
 
     rclcpp::SubscriptionOptions so;
@@ -822,7 +889,7 @@ public:
   rclcpp::Node::SharedPtr node;
   rclcpp::Publisher<test_msgs::msg::Empty>::SharedPtr publisher;
   rclcpp::Subscription<test_msgs::msg::Empty>::SharedPtr subscription;
-  std::atomic_int callback_count;
+  std::atomic_size_t callback_count;
 };
 
 TYPED_TEST_SUITE(TestIntraprocessExecutors, ExecutorTypes, ExecutorTypeNames);
@@ -838,7 +905,7 @@ TYPED_TEST(TestIntraprocessExecutors, testIntraprocessRetrigger) {
   ExecutorType executor;
   executor.add_node(this->node);
 
-  EXPECT_EQ(0, this->callback_count.load());
+  EXPECT_EQ(0u, this->callback_count.load());
   this->publisher->publish(test_msgs::msg::Empty());
 
   // Wait for up to 5 seconds for the first message to come available.
@@ -852,7 +919,7 @@ TYPED_TEST(TestIntraprocessExecutors, testIntraprocessRetrigger) {
   EXPECT_EQ(1u, this->callback_count.load());
 
   // reset counter
-  this->callback_count.store(0);
+  this->callback_count.store(0u);
 
   for (size_t ii = 0; ii < kNumMessages; ++ii) {
     this->publisher->publish(test_msgs::msg::Empty());

rclcpp/test/rclcpp/node_interfaces/test_node_parameters.cpp

@@ -77,9 +77,9 @@ TEST_F(TestNodeParameters, list_parameters)
   std::vector<std::string> prefixes;
   const auto list_result = node_parameters->list_parameters(prefixes, 1u);
 
-  // Currently the only default parameter is 'use_sim_time', but that may change.
+  // Currently the default parameters are 'use_sim_time' and 'start_type_description_service'
   size_t number_of_parameters = list_result.names.size();
-  EXPECT_GE(1u, number_of_parameters);
+  EXPECT_GE(2u, number_of_parameters);
 
   const std::string parameter_name = "new_parameter";
   const rclcpp::ParameterValue value(true);

rclcpp/test/rclcpp/node_interfaces/test_node_type_descriptions.cpp

@@ -0,0 +1,63 @@
+// Copyright 2023 Open Source Robotics Foundation, Inc.
+//
+// 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 <gtest/gtest.h>
+
+#include "rclcpp/node.hpp"
+#include "rclcpp/node_interfaces/node_type_descriptions.hpp"
+
+class TestNodeTypeDescriptions : public ::testing::Test
+{
+public:
+  void SetUp()
+  {
+    rclcpp::init(0, nullptr);
+  }
+
+  void TearDown()
+  {
+    rclcpp::shutdown();
+  }
+};
+
+TEST_F(TestNodeTypeDescriptions, interface_created)
+{
+  rclcpp::Node node{"node", "ns"};
+  ASSERT_NE(nullptr, node.get_node_type_descriptions_interface());
+}
+
+TEST_F(TestNodeTypeDescriptions, disabled_no_service)
+{
+  rclcpp::NodeOptions node_options;
+  node_options.append_parameter_override("start_type_description_service", false);
+  rclcpp::Node node{"node", "ns", node_options};
+
+  rcl_node_t * rcl_node = node.get_node_base_interface()->get_rcl_node_handle();
+  rcl_service_t * srv = nullptr;
+  rcl_ret_t ret = rcl_node_get_type_description_service(rcl_node, &srv);
+  ASSERT_EQ(RCL_RET_NOT_INIT, ret);
+}
+
+TEST_F(TestNodeTypeDescriptions, enabled_creates_service)
+{
+  rclcpp::NodeOptions node_options;
+  node_options.append_parameter_override("start_type_description_service", true);
+  rclcpp::Node node{"node", "ns", node_options};
+
+  rcl_node_t * rcl_node = node.get_node_base_interface()->get_rcl_node_handle();
+  rcl_service_t * srv = nullptr;
+  rcl_ret_t ret = rcl_node_get_type_description_service(rcl_node, &srv);
+  ASSERT_EQ(RCL_RET_OK, ret);
+  ASSERT_NE(nullptr, srv);
+}

rclcpp/test/rclcpp/test_node.cpp

@@ -78,6 +78,7 @@ TEST_F(TestNode, construction_and_destruction) {
     EXPECT_NE(nullptr, node->get_node_options().get_rcl_node_options());
     EXPECT_NE(nullptr, node->get_graph_event());
     EXPECT_NE(nullptr, node->get_clock());
+    EXPECT_NE(nullptr, node->get_node_type_descriptions_interface());
   }
 
   {

rclcpp/test/rclcpp/test_parameter_client.cpp

@@ -59,6 +59,8 @@ protected:
     node_with_option.reset();
   }
 
+  // "start_type_description_service" and "use_sim_time"
+  const uint64_t builtin_param_count = 2;
   rclcpp::Node::SharedPtr node;
   rclcpp::Node::SharedPtr node_with_option;
 };
@@ -925,6 +927,7 @@ TEST_F(TestParameterClient, sync_parameter_delete_parameters) {
   Coverage for async load_parameters
  */
 TEST_F(TestParameterClient, async_parameter_load_parameters) {
+  const uint64_t expected_param_count = 4 + builtin_param_count;
   auto load_node = std::make_shared<rclcpp::Node>(
     "load_node",
     "namespace",
@@ -944,12 +947,13 @@ TEST_F(TestParameterClient, async_parameter_load_parameters) {
   auto list_parameters = asynchronous_client->list_parameters({}, 3);
   rclcpp::spin_until_future_complete(
     load_node, list_parameters, std::chrono::milliseconds(100));
-  ASSERT_EQ(list_parameters.get().names.size(), static_cast<uint64_t>(5));
+  ASSERT_EQ(list_parameters.get().names.size(), expected_param_count);
 }
 /*
   Coverage for sync load_parameters
  */
 TEST_F(TestParameterClient, sync_parameter_load_parameters) {
+  const uint64_t expected_param_count = 4 + builtin_param_count;
   auto load_node = std::make_shared<rclcpp::Node>(
     "load_node",
     "namespace",
@@ -964,13 +968,14 @@ TEST_F(TestParameterClient, sync_parameter_load_parameters) {
   ASSERT_EQ(load_future[0].successful, true);
   // list parameters
   auto list_parameters = synchronous_client->list_parameters({}, 3);
-  ASSERT_EQ(list_parameters.names.size(), static_cast<uint64_t>(5));
+  ASSERT_EQ(list_parameters.names.size(), static_cast<uint64_t>(expected_param_count));
 }
 
 /*
   Coverage for async load_parameters with complicated regex expression
  */
 TEST_F(TestParameterClient, async_parameter_load_parameters_complicated_regex) {
+  const uint64_t expected_param_count = 5 + builtin_param_count;
   auto load_node = std::make_shared<rclcpp::Node>(
     "load_node",
     "namespace",
@@ -990,7 +995,7 @@ TEST_F(TestParameterClient, async_parameter_load_parameters_complicated_regex) {
   auto list_parameters = asynchronous_client->list_parameters({}, 3);
   rclcpp::spin_until_future_complete(
     load_node, list_parameters, std::chrono::milliseconds(100));
-  ASSERT_EQ(list_parameters.get().names.size(), static_cast<uint64_t>(6));
+  ASSERT_EQ(list_parameters.get().names.size(), expected_param_count);
   // to check the parameter "a_value"
   std::string param_name = "a_value";
   auto param = load_node->get_parameter(param_name);
@@ -1020,6 +1025,7 @@ TEST_F(TestParameterClient, async_parameter_load_no_valid_parameter) {
   Coverage for async load_parameters from maps with complicated regex expression
  */
 TEST_F(TestParameterClient, async_parameter_load_parameters_from_map) {
+  const uint64_t expected_param_count = 5 + builtin_param_count;
   auto load_node = std::make_shared<rclcpp::Node>(
     "load_node",
     "namespace",
@@ -1068,7 +1074,7 @@ TEST_F(TestParameterClient, async_parameter_load_parameters_from_map) {
   auto list_parameters = asynchronous_client->list_parameters({}, 3);
   rclcpp::spin_until_future_complete(
     load_node, list_parameters, std::chrono::milliseconds(100));
-  ASSERT_EQ(list_parameters.get().names.size(), static_cast<uint64_t>(6));
+  ASSERT_EQ(list_parameters.get().names.size(), expected_param_count);
   // to check the parameter "a_value"
   std::string param_name = "a_value";
   auto param = load_node->get_parameter(param_name);

rclcpp_action/CHANGELOG.rst

@@ -3,6 +3,15 @@ Changelog for package rclcpp_action
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 
+21.0.3 (2023-09-08)
+-------------------
+
+21.0.2 (2023-07-14)
+-------------------
+
+21.0.1 (2023-05-11)
+-------------------
+
 21.0.0 (2023-04-18)
 -------------------
 

rclcpp_action/package.xml

@@ -2,7 +2,7 @@
 <?xml-model href="http://download.ros.org/schema/package_format2.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
 <package format="2">
   <name>rclcpp_action</name>
-  <version>21.0.0</version>
+  <version>21.0.3</version>
   <description>Adds action APIs for C++.</description>
 
   <maintainer email="ivanpauno@ekumenlabs.com">Ivan Paunovic</maintainer>

rclcpp_components/CHANGELOG.rst

@@ -2,6 +2,15 @@
 Changelog for package rclcpp_components
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
+21.0.3 (2023-09-08)
+-------------------
+
+21.0.2 (2023-07-14)
+-------------------
+
+21.0.1 (2023-05-11)
+-------------------
+
 21.0.0 (2023-04-18)
 -------------------
 

rclcpp_components/package.xml

@@ -2,7 +2,7 @@
 <?xml-model href="http://download.ros.org/schema/package_format2.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
 <package format="2">
   <name>rclcpp_components</name>
-  <version>21.0.0</version>
+  <version>21.0.3</version>
   <description>Package containing tools for dynamically loadable components</description>
 
   <maintainer email="ivanpauno@ekumenlabs.com">Ivan Paunovic</maintainer>

rclcpp_lifecycle/CHANGELOG.rst

@@ -3,6 +3,18 @@ Changelog for package rclcpp_lifecycle
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 
+21.0.3 (2023-09-08)
+-------------------
+* Switch lifecycle to use the RCLCPP macros. (`#2244 <https://github.com/ros2/rclcpp/issues/2244>`_)
+* Add new node interface TypeDescriptionsInterface to provide GetTypeDescription service (`#2236 <https://github.com/ros2/rclcpp/issues/2236>`_)
+* Contributors: Emerson Knapp
+
+21.0.2 (2023-07-14)
+-------------------
+
+21.0.1 (2023-05-11)
+-------------------
+
 21.0.0 (2023-04-18)
 -------------------
 * Add support for logging service. (`#2122 <https://github.com/ros2/rclcpp/issues/2122>`_)

rclcpp_lifecycle/include/rclcpp_lifecycle/lifecycle_node.hpp

@@ -72,6 +72,7 @@
 #include "rclcpp/node_interfaces/node_time_source_interface.hpp"
 #include "rclcpp/node_interfaces/node_timers_interface.hpp"
 #include "rclcpp/node_interfaces/node_topics_interface.hpp"
+#include "rclcpp/node_interfaces/node_type_descriptions_interface.hpp"
 #include "rclcpp/node_interfaces/node_waitables_interface.hpp"
 #include "rclcpp/parameter.hpp"
 #include "rclcpp/publisher.hpp"
@@ -823,6 +824,14 @@ public:
   rclcpp::node_interfaces::NodeTimeSourceInterface::SharedPtr
   get_node_time_source_interface();
 
+  /// Return the Node's internal NodeTypeDescriptionsInterface implementation.
+  /**
+   * \sa rclcpp::Node::get_node_type_descriptions_interface
+   */
+  RCLCPP_LIFECYCLE_PUBLIC
+  rclcpp::node_interfaces::NodeTypeDescriptionsInterface::SharedPtr
+  get_node_type_descriptions_interface();
+
   /// Return the Node's internal NodeWaitablesInterface implementation.
   /**
    * \sa rclcpp::Node::get_node_waitables_interface

rclcpp_lifecycle/package.xml

@@ -2,7 +2,7 @@
 <?xml-model href="http://download.ros.org/schema/package_format2.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
 <package format="2">
   <name>rclcpp_lifecycle</name>
-  <version>21.0.0</version>
+  <version>21.0.3</version>
   <description>Package containing a prototype for lifecycle implementation</description>
 
   <maintainer email="ivanpauno@ekumenlabs.com">Ivan Paunovic</maintainer>

rclcpp_lifecycle/src/lifecycle_node.cpp

@@ -43,6 +43,7 @@
 #include "rclcpp/node_interfaces/node_time_source.hpp"
 #include "rclcpp/node_interfaces/node_timers.hpp"
 #include "rclcpp/node_interfaces/node_topics.hpp"
+#include "rclcpp/node_interfaces/node_type_descriptions.hpp"
 #include "rclcpp/node_interfaces/node_waitables.hpp"
 #include "rclcpp/parameter_service.hpp"
 #include "rclcpp/qos.hpp"
@@ -115,7 +116,11 @@ LifecycleNode::LifecycleNode(
     )),
   node_waitables_(new rclcpp::node_interfaces::NodeWaitables(node_base_.get())),
   node_options_(options),
-  impl_(new LifecycleNodeInterfaceImpl(node_base_, node_services_))
+  impl_(new LifecycleNodeInterfaceImpl(
+      node_base_,
+      node_logging_,
+      node_parameters_,
+      node_services_))
 {
   impl_->init(enable_communication_interface);
 
@@ -474,6 +479,12 @@ LifecycleNode::get_node_services_interface()
   return node_services_;
 }
 
+rclcpp::node_interfaces::NodeTypeDescriptionsInterface::SharedPtr
+LifecycleNode::get_node_type_descriptions_interface()
+{
+  return impl_->get_node_type_descriptions_interface();
+}
+
 rclcpp::node_interfaces::NodeParametersInterface::SharedPtr
 LifecycleNode::get_node_parameters_interface()
 {

rclcpp_lifecycle/src/lifecycle_node_interface_impl.cpp

@@ -29,7 +29,9 @@
 #include "lifecycle_msgs/srv/get_available_transitions.hpp"
 
 #include "rclcpp/node_interfaces/node_base_interface.hpp"
+#include "rclcpp/node_interfaces/node_logging_interface.hpp"
 #include "rclcpp/node_interfaces/node_services_interface.hpp"
+#include "rclcpp/node_interfaces/node_type_descriptions.hpp"
 
 #include "rclcpp_lifecycle/node_interfaces/lifecycle_node_interface.hpp"
 
@@ -50,9 +52,17 @@ namespace rclcpp_lifecycle
 
 LifecycleNode::LifecycleNodeInterfaceImpl::LifecycleNodeInterfaceImpl(
   std::shared_ptr<rclcpp::node_interfaces::NodeBaseInterface> node_base_interface,
+  std::shared_ptr<rclcpp::node_interfaces::NodeLoggingInterface> node_logging_interface,
+  std::shared_ptr<rclcpp::node_interfaces::NodeParametersInterface> node_parameters_interface,
   std::shared_ptr<rclcpp::node_interfaces::NodeServicesInterface> node_services_interface)
 : node_base_interface_(node_base_interface),
-  node_services_interface_(node_services_interface)
+  node_services_interface_(node_services_interface),
+  node_logging_interface_(node_logging_interface),
+  node_type_descriptions_(new rclcpp::node_interfaces::NodeTypeDescriptions(
+      node_base_interface,
+      node_logging_interface,
+      node_parameters_interface,
+      node_services_interface))
 {
 }
 
@@ -65,8 +75,8 @@ LifecycleNode::LifecycleNodeInterfaceImpl::~LifecycleNodeInterfaceImpl()
     ret = rcl_lifecycle_state_machine_fini(&state_machine_, node_handle);
   }
   if (ret != RCL_RET_OK) {
-    RCUTILS_LOG_FATAL_NAMED(
-      "rclcpp_lifecycle",
+    RCLCPP_FATAL(
+      node_logging_interface_->get_logger(),
       "failed to destroy rcl_state_machine");
   }
 }
@@ -398,7 +408,8 @@ LifecycleNode::LifecycleNodeInterfaceImpl::change_state(
   {
     std::lock_guard<std::recursive_mutex> lock(state_machine_mutex_);
     if (rcl_lifecycle_state_machine_is_initialized(&state_machine_) != RCL_RET_OK) {
-      RCUTILS_LOG_ERROR(
+      RCLCPP_ERROR(
+        node_logging_interface_->get_logger(),
         "Unable to change state for state machine for %s: %s",
         node_base_interface_->get_name(), rcl_get_error_string().str);
       return RCL_RET_ERROR;
@@ -411,7 +422,8 @@ LifecycleNode::LifecycleNodeInterfaceImpl::change_state(
       rcl_lifecycle_trigger_transition_by_id(
         &state_machine_, transition_id, publish_update) != RCL_RET_OK)
     {
-      RCUTILS_LOG_ERROR(
+      RCLCPP_ERROR(
+        node_logging_interface_->get_logger(),
         "Unable to start transition %u from current state %s: %s",
         transition_id, state_machine_.current_state->label, rcl_get_error_string().str);
       rcutils_reset_error();
@@ -443,7 +455,8 @@ LifecycleNode::LifecycleNodeInterfaceImpl::change_state(
       rcl_lifecycle_trigger_transition_by_label(
         &state_machine_, transition_label, publish_update) != RCL_RET_OK)
     {
-      RCUTILS_LOG_ERROR(
+      RCLCPP_ERROR(
+        node_logging_interface_->get_logger(),
         "Failed to finish transition %u. Current state is now: %s (%s)",
         transition_id, state_machine_.current_state->label, rcl_get_error_string().str);
       rcutils_reset_error();
@@ -458,7 +471,9 @@ LifecycleNode::LifecycleNodeInterfaceImpl::change_state(
   // error handling ?!
   // TODO(karsten1987): iterate over possible ret value
   if (cb_return_code == node_interfaces::LifecycleNodeInterface::CallbackReturn::ERROR) {
-    RCUTILS_LOG_WARN("Error occurred while doing error handling.");
+    RCLCPP_WARN(
+      node_logging_interface_->get_logger(),
+      "Error occurred while doing error handling.");
 
     auto error_cb_code = execute_callback(current_state_id, initial_state);
     auto error_cb_label = get_label_for_return_code(error_cb_code);
@@ -467,7 +482,9 @@ LifecycleNode::LifecycleNodeInterfaceImpl::change_state(
       rcl_lifecycle_trigger_transition_by_label(
         &state_machine_, error_cb_label, publish_update) != RCL_RET_OK)
     {
-      RCUTILS_LOG_ERROR("Failed to call cleanup on error state: %s", rcl_get_error_string().str);
+      RCLCPP_ERROR(
+        node_logging_interface_->get_logger(),
+        "Failed to call cleanup on error state: %s", rcl_get_error_string().str);
       rcutils_reset_error();
       return RCL_RET_ERROR;
     }
@@ -495,8 +512,12 @@ LifecycleNode::LifecycleNodeInterfaceImpl::execute_callback(
     try {
       cb_success = callback(State(previous_state));
     } catch (const std::exception & e) {
-      RCUTILS_LOG_ERROR("Caught exception in callback for transition %d", it->first);
-      RCUTILS_LOG_ERROR("Original error: %s", e.what());
+      RCLCPP_ERROR(
+        node_logging_interface_->get_logger(),
+        "Caught exception in callback for transition %d", it->first);
+      RCLCPP_ERROR(
+        node_logging_interface_->get_logger(),
+        "Original error: %s", e.what());
       cb_success = node_interfaces::LifecycleNodeInterface::CallbackReturn::ERROR;
     }
   }
@@ -581,4 +602,10 @@ LifecycleNode::LifecycleNodeInterfaceImpl::on_deactivate() const
   }
 }
 
+rclcpp::node_interfaces::NodeTypeDescriptionsInterface::SharedPtr
+LifecycleNode::LifecycleNodeInterfaceImpl::get_node_type_descriptions_interface()
+{
+  return node_type_descriptions_;
+}
+
 }  // namespace rclcpp_lifecycle

rclcpp_lifecycle/src/lifecycle_node_interface_impl.hpp

@@ -32,6 +32,7 @@
 
 #include "rclcpp/macros.hpp"
 #include "rclcpp/node_interfaces/node_base_interface.hpp"
+#include "rclcpp/node_interfaces/node_logging_interface.hpp"
 #include "rclcpp/node_interfaces/node_services_interface.hpp"
 
 #include "rclcpp_lifecycle/node_interfaces/lifecycle_node_interface.hpp"
@@ -52,6 +53,8 @@ class LifecycleNode::LifecycleNodeInterfaceImpl final
 public:
   LifecycleNodeInterfaceImpl(
     std::shared_ptr<rclcpp::node_interfaces::NodeBaseInterface> node_base_interface,
+    std::shared_ptr<rclcpp::node_interfaces::NodeLoggingInterface> node_logging_interface,
+    std::shared_ptr<rclcpp::node_interfaces::NodeParametersInterface> node_parameters_interface,
     std::shared_ptr<rclcpp::node_interfaces::NodeServicesInterface> node_services_interface);
 
   ~LifecycleNodeInterfaceImpl();
@@ -102,6 +105,9 @@ public:
   void
   add_timer_handle(std::shared_ptr<rclcpp::TimerBase> timer);
 
+  rclcpp::node_interfaces::NodeTypeDescriptionsInterface::SharedPtr
+  get_node_type_descriptions_interface();
+
 private:
   RCLCPP_DISABLE_COPY(LifecycleNodeInterfaceImpl)
 
@@ -152,6 +158,7 @@ private:
 
   using NodeBasePtr = std::shared_ptr<rclcpp::node_interfaces::NodeBaseInterface>;
   using NodeServicesPtr = std::shared_ptr<rclcpp::node_interfaces::NodeServicesInterface>;
+  using NodeLoggingPtr = std::shared_ptr<rclcpp::node_interfaces::NodeLoggingInterface>;
   using ChangeStateSrvPtr = std::shared_ptr<rclcpp::Service<ChangeStateSrv>>;
   using GetStateSrvPtr = std::shared_ptr<rclcpp::Service<GetStateSrv>>;
   using GetAvailableStatesSrvPtr =
@@ -163,6 +170,7 @@ private:
 
   NodeBasePtr node_base_interface_;
   NodeServicesPtr node_services_interface_;
+  NodeLoggingPtr node_logging_interface_;
   ChangeStateSrvPtr srv_change_state_;
   GetStateSrvPtr srv_get_state_;
   GetAvailableStatesSrvPtr srv_get_available_states_;
@@ -172,6 +180,9 @@ private:
   // to controllable things
   std::vector<std::weak_ptr<rclcpp_lifecycle::ManagedEntityInterface>> weak_managed_entities_;
   std::vector<std::weak_ptr<rclcpp::TimerBase>> weak_timers_;
+
+  // Backported members hidden in impl
+  rclcpp::node_interfaces::NodeTypeDescriptionsInterface::SharedPtr node_type_descriptions_;
 };
 
 }  // namespace rclcpp_lifecycle

rclcpp_lifecycle/test/test_lifecycle_node.cpp

@@ -427,11 +427,15 @@ TEST_F(TestDefaultStateMachine, lifecycle_subscriber) {
 // Parameters are tested more thoroughly in rclcpp's test_node.cpp
 // These are provided for coverage of lifecycle node's API
 TEST_F(TestDefaultStateMachine, declare_parameters) {
+  // "start_type_description_service" and "use_sim_time"
+  const uint64_t builtin_param_count = 2;
+  const uint64_t expected_param_count = 6 + builtin_param_count;
   auto test_node = std::make_shared<EmptyLifecycleNode>("testnode");
 
   auto list_result = test_node->list_parameters({}, 0u);
-  EXPECT_EQ(list_result.names.size(), 1u);
-  EXPECT_STREQ(list_result.names[0].c_str(), "use_sim_time");
+  EXPECT_EQ(list_result.names.size(), builtin_param_count);
+  EXPECT_STREQ(list_result.names[0].c_str(), "start_type_description_service");
+  EXPECT_STREQ(list_result.names[1].c_str(), "use_sim_time");
 
   const std::string bool_name = "test_boolean";
   const std::string int_name = "test_int";
@@ -469,10 +473,11 @@ TEST_F(TestDefaultStateMachine, declare_parameters) {
   test_node->declare_parameters("test_double", double_parameters);
 
   list_result = test_node->list_parameters({}, 0u);
-  EXPECT_EQ(list_result.names.size(), 7u);
+  EXPECT_EQ(list_result.names.size(), expected_param_count);
 
   // The order of these names is not controlled by lifecycle_node, doing set equality
   std::set<std::string> expected_names = {
+    "start_type_description_service",
     "test_boolean",
     "test_double.double_one",
     "test_double.double_two",
@@ -487,11 +492,13 @@ TEST_F(TestDefaultStateMachine, declare_parameters) {
 }
 
 TEST_F(TestDefaultStateMachine, check_parameters) {
+  const uint64_t builtin_param_count = 2;
   auto test_node = std::make_shared<EmptyLifecycleNode>("testnode");
 
   auto list_result = test_node->list_parameters({}, 0u);
-  EXPECT_EQ(list_result.names.size(), 1u);
-  EXPECT_STREQ(list_result.names[0].c_str(), "use_sim_time");
+  EXPECT_EQ(list_result.names.size(), builtin_param_count);
+  EXPECT_STREQ(list_result.names[0].c_str(), "start_type_description_service");
+  EXPECT_STREQ(list_result.names[1].c_str(), "use_sim_time");
 
   const std::string bool_name = "test_boolean";
   const std::string int_name = "test_int";
@@ -549,8 +556,7 @@ TEST_F(TestDefaultStateMachine, check_parameters) {
   std::map<std::string, rclcpp::ParameterValue> parameter_map;
   EXPECT_TRUE(test_node->get_parameters({}, parameter_map));
 
-  // int param, bool param, and use_sim_time
-  EXPECT_EQ(parameter_map.size(), 3u);
+  EXPECT_EQ(parameter_map.size(), parameter_names.size() + builtin_param_count);
 
   // Check parameter types
   auto parameter_types = test_node->get_parameter_types(parameter_names);
@@ -585,10 +591,12 @@ TEST_F(TestDefaultStateMachine, check_parameters) {
 
   // List parameters
   list_result = test_node->list_parameters({}, 0u);
-  EXPECT_EQ(list_result.names.size(), 3u);
-  EXPECT_STREQ(list_result.names[0].c_str(), parameter_names[0].c_str());
-  EXPECT_STREQ(list_result.names[1].c_str(), parameter_names[1].c_str());
-  EXPECT_STREQ(list_result.names[2].c_str(), "use_sim_time");
+  EXPECT_EQ(list_result.names.size(), parameter_names.size() + builtin_param_count);
+  size_t index = 0;
+  EXPECT_STREQ(list_result.names[index++].c_str(), "start_type_description_service");
+  EXPECT_STREQ(list_result.names[index++].c_str(), parameter_names[0].c_str());
+  EXPECT_STREQ(list_result.names[index++].c_str(), parameter_names[1].c_str());
+  EXPECT_STREQ(list_result.names[index++].c_str(), "use_sim_time");
 
   // Undeclare parameter
   test_node->undeclare_parameter(bool_name);
@@ -633,6 +641,7 @@ TEST_F(TestDefaultStateMachine, test_getters) {
   EXPECT_LT(0u, test_node->now().nanoseconds());
   EXPECT_STREQ("testnode", test_node->get_logger().get_name());
   EXPECT_NE(nullptr, const_cast<const EmptyLifecycleNode *>(test_node.get())->get_clock());
+  EXPECT_NE(nullptr, test_node->get_node_type_descriptions_interface());
 }
 
 TEST_F(TestDefaultStateMachine, test_graph_topics) {