Implement callbacks for liveliness and deadline QoS events

rclcpp/CMakeLists.txt

@@ -65,6 +65,7 @@ set(${PROJECT_NAME}_SRCS
   src/rclcpp/parameter_map.cpp
   src/rclcpp/parameter_service.cpp
   src/rclcpp/publisher.cpp
+  src/rclcpp/qos_event.cpp
   src/rclcpp/service.cpp
   src/rclcpp/signal_handler.cpp
   src/rclcpp/subscription.cpp

rclcpp/include/rclcpp/callback_group.hpp

@@ -21,6 +21,7 @@
 #include <vector>
 
 #include "rclcpp/client.hpp"
+#include "rclcpp/publisher.hpp"
 #include "rclcpp/service.hpp"
 #include "rclcpp/subscription.hpp"
 #include "rclcpp/timer.hpp"
@@ -92,6 +93,10 @@ class CallbackGroup
 protected:
   RCLCPP_DISABLE_COPY(CallbackGroup)
 
+  RCLCPP_PUBLIC
+  void
+  add_publisher(const rclcpp::PublisherBase::SharedPtr publisher_ptr);
+
   RCLCPP_PUBLIC
   void
   add_subscription(const rclcpp::SubscriptionBase::SharedPtr subscription_ptr);

rclcpp/include/rclcpp/create_publisher.hpp

@@ -31,6 +31,8 @@ create_publisher(
   rclcpp::node_interfaces::NodeTopicsInterface * node_topics,
   const std::string & topic_name,
   const rmw_qos_profile_t & qos_profile,
+  const PublisherEventCallbacks & event_callbacks,
+  rclcpp::callback_group::CallbackGroup::SharedPtr group,
   bool use_intra_process_comms,
   std::shared_ptr<AllocatorT> allocator)
 {
@@ -39,10 +41,12 @@ create_publisher(
 
   auto pub = node_topics->create_publisher(
     topic_name,
-    rclcpp::create_publisher_factory<MessageT, AllocatorT, PublisherT>(allocator),
+    rclcpp::create_publisher_factory<MessageT, AllocatorT, PublisherT>(event_callbacks, allocator),
     publisher_options,
     use_intra_process_comms);
-  node_topics->add_publisher(pub);
+
+  node_topics->add_publisher(pub, group);
+
   return std::dynamic_pointer_cast<PublisherT>(pub);
 }
 

rclcpp/include/rclcpp/create_subscription.hpp

@@ -38,6 +38,7 @@ create_subscription(
   const std::string & topic_name,
   CallbackT && callback,
   const rmw_qos_profile_t & qos_profile,
+  const SubscriptionEventCallbacks & event_callbacks,
   rclcpp::callback_group::CallbackGroup::SharedPtr group,
   bool ignore_local_publications,
   bool use_intra_process_comms,
@@ -52,7 +53,10 @@ create_subscription(
 
   auto factory = rclcpp::create_subscription_factory
     <MessageT, CallbackT, AllocatorT, CallbackMessageT, SubscriptionT>(
-    std::forward<CallbackT>(callback), msg_mem_strat, allocator);
+    std::forward<CallbackT>(callback),
+    event_callbacks,
+    msg_mem_strat,
+    allocator);
 
   auto sub = node_topics->create_subscription(
     topic_name,

rclcpp/include/rclcpp/exceptions.hpp

@@ -111,6 +111,7 @@ class InvalidServiceNameError : public NameValidationError
  * \throws RCLErrorBase some child class exception based on ret
  */
 RCLCPP_PUBLIC
+[[noreturn]]
 void
 throw_from_rcl_error(
   rcl_ret_t ret,

rclcpp/include/rclcpp/memory_strategy.hpp

@@ -51,6 +51,7 @@ class RCLCPP_PUBLIC MemoryStrategy
   virtual size_t number_of_ready_subscriptions() const = 0;
   virtual size_t number_of_ready_services() const = 0;
   virtual size_t number_of_ready_clients() const = 0;
+  virtual size_t number_of_ready_events() const = 0;
   virtual size_t number_of_ready_timers() const = 0;
   virtual size_t number_of_guard_conditions() const = 0;
   virtual size_t number_of_waitables() const = 0;

rclcpp/include/rclcpp/node.hpp

@@ -1120,6 +1120,19 @@ class Node : public std::enable_shared_from_this<Node>
   const NodeOptions &
   get_node_options() const;
 
+  /// Manually assert that this Node is alive (for RMW_QOS_POLICY_LIVELINESS_MANUAL_BY_NODE).
+  /**
+   * If the rmw Liveliness policy is set to RMW_QOS_POLICY_LIVELINESS_MANUAL_BY_NODE, the creator
+   * of this node may manually call `assert_liveliness` at some point in time to signal to the rest
+   * of the system that this Node is still alive.
+   *
+   * \return `true` if the liveliness was asserted successfully, otherwise `false`
+   */
+  RCLCPP_PUBLIC
+  RCUTILS_WARN_UNUSED
+  bool
+  assert_liveliness() const;
+
 protected:
   /// Construct a sub-node, which will extend the namespace of all entities created with it.
   /**

rclcpp/include/rclcpp/node_impl.hpp

@@ -97,6 +97,8 @@ Node::create_publisher(
     this->node_topics_.get(),
     extend_name_with_sub_namespace(topic_name, this->get_sub_namespace()),
     qos_profile,
+    options.event_callbacks,
+    options.callback_group,
     use_intra_process,
     allocator);
 }
@@ -181,6 +183,7 @@ Node::create_subscription(
     extend_name_with_sub_namespace(topic_name, this->get_sub_namespace()),
     std::forward<CallbackT>(callback),
     qos_profile,
+    options.event_callbacks,
     options.callback_group,
     options.ignore_local_publications,
     use_intra_process,

rclcpp/include/rclcpp/node_interfaces/node_base.hpp

@@ -86,6 +86,11 @@ class NodeBase : public NodeBaseInterface
   std::shared_ptr<const rcl_node_t>
   get_shared_rcl_node_handle() const;
 
+  RCLCPP_PUBLIC
+  virtual
+  bool
+  assert_liveliness() const;
+
   RCLCPP_PUBLIC
   virtual
   rclcpp::callback_group::CallbackGroup::SharedPtr

rclcpp/include/rclcpp/node_interfaces/node_base_interface.hpp

@@ -102,6 +102,12 @@ class NodeBaseInterface
   std::shared_ptr<const rcl_node_t>
   get_shared_rcl_node_handle() const = 0;
 
+  /// Manually assert that this Node is alive (for RMW_QOS_POLICY_LIVELINESS_MANUAL_BY_NODE).
+  RCLCPP_PUBLIC
+  virtual
+  bool
+  assert_liveliness() const = 0;
+
   /// Create and return a callback group.
   RCLCPP_PUBLIC
   virtual

rclcpp/include/rclcpp/node_interfaces/node_topics.hpp

@@ -58,7 +58,8 @@ class NodeTopics : public NodeTopicsInterface
   virtual
   void
   add_publisher(
-    rclcpp::PublisherBase::SharedPtr publisher);
+    rclcpp::PublisherBase::SharedPtr publisher,
+    rclcpp::callback_group::CallbackGroup::SharedPtr callback_group);
 
   RCLCPP_PUBLIC
   virtual

rclcpp/include/rclcpp/node_interfaces/node_topics_interface.hpp

@@ -57,7 +57,8 @@ class NodeTopicsInterface
   virtual
   void
   add_publisher(
-    rclcpp::PublisherBase::SharedPtr publisher) = 0;
+    rclcpp::PublisherBase::SharedPtr publisher,
+    rclcpp::callback_group::CallbackGroup::SharedPtr callback_group) = 0;
 
   RCLCPP_PUBLIC
   virtual

rclcpp/include/rclcpp/parameter_client.hpp

@@ -127,6 +127,7 @@ class AsyncParametersClient
       "parameter_events",
       std::forward<CallbackT>(callback),
       rmw_qos_profile_default,
+      SubscriptionEventCallbacks(),
       nullptr,  // group,
       false,  // ignore_local_publications,
       false,  // use_intra_process_comms_,

rclcpp/include/rclcpp/publisher.hpp

@@ -23,6 +23,7 @@
 #include <memory>
 #include <sstream>
 #include <string>
+#include <vector>
 
 #include "rcl/error_handling.h"
 #include "rcl/publisher.h"
@@ -31,17 +32,21 @@
 
 #include "rclcpp/allocator/allocator_common.hpp"
 #include "rclcpp/allocator/allocator_deleter.hpp"
+#include "rclcpp/exceptions.hpp"
 #include "rclcpp/macros.hpp"
-#include "rclcpp/node_interfaces/node_base_interface.hpp"
+#include "rclcpp/qos_event.hpp"
 #include "rclcpp/type_support_decl.hpp"
 #include "rclcpp/visibility_control.hpp"
 
 namespace rclcpp
 {
 
-// Forward declaration is used for friend statement.
 namespace node_interfaces
 {
+// Forward declaration avoids including node_base_interface.hpp
+// which causes circular inclusion from callback_group.hpp
+class NodeBaseInterface;
+// Forward declaration is used for friend statement.
 class NodeTopicsInterface;
 }
 
@@ -116,6 +121,12 @@ class PublisherBase
   const rcl_publisher_t *
   get_publisher_handle() const;
 
+  /// Get all the QoS event handlers associated with this publisher.
+  /** \return The vector of QoS event handlers. */
+  RCLCPP_PUBLIC
+  const std::vector<std::shared_ptr<rclcpp::QOSEventHandlerBase>> &
+  get_event_handlers() const;
+
   /// Get subscription count
   /** \return The number of subscriptions. */
   RCLCPP_PUBLIC
@@ -128,6 +139,19 @@ class PublisherBase
   size_t
   get_intra_process_subscription_count() const;
 
+  /// Manually assert that this Publisher is alive (for RMW_QOS_POLICY_LIVELINESS_MANUAL_BY_TOPIC).
+  /**
+   * If the rmw Liveliness policy is set to RMW_QOS_POLICY_LIVELINESS_MANUAL_BY_TOPIC, the creator
+   * of this publisher may manually call `assert_liveliness` at some point in time to signal to the
+   * rest of the system that this Node is still alive.
+   *
+   * \return `true` if the liveliness was asserted successfully, otherwise `false`
+   */
+  RCLCPP_PUBLIC
+  RCUTILS_WARN_UNUSED
+  bool
+  assert_liveliness() const;
+
   /// Get the actual QoS settings, after the defaults have been determined.
   /**
    * The actual configuration applied when using RMW_QOS_POLICY_*_SYSTEM_DEFAULT
@@ -176,11 +200,27 @@ class PublisherBase
     const rcl_publisher_options_t & intra_process_options);
 
 protected:
+  template<typename EventCallbackT>
+  void
+  add_event_handler(
+    const EventCallbackT & callback,
+    const rcl_publisher_event_type_t event_type)
+  {
+    auto handler = std::make_shared<QOSEventHandler<EventCallbackT>>(
+      callback,
+      rcl_publisher_event_init,
+      &publisher_handle_,
+      event_type);
+    event_handlers_.emplace_back(handler);
+  }
+
   std::shared_ptr<rcl_node_t> rcl_node_handle_;
 
   rcl_publisher_t publisher_handle_ = rcl_get_zero_initialized_publisher();
   rcl_publisher_t intra_process_publisher_handle_ = rcl_get_zero_initialized_publisher();
 
+  std::vector<std::shared_ptr<rclcpp::QOSEventHandlerBase>> event_handlers_;
+
   using IntraProcessManagerWeakPtr =
     std::weak_ptr<rclcpp::intra_process_manager::IntraProcessManager>;
   bool intra_process_is_enabled_;
@@ -208,6 +248,7 @@ class Publisher : public PublisherBase
     rclcpp::node_interfaces::NodeBaseInterface * node_base,
     const std::string & topic,
     const rcl_publisher_options_t & publisher_options,
+    const PublisherEventCallbacks & event_callbacks,
     const std::shared_ptr<MessageAlloc> & allocator)
   : PublisherBase(
       node_base,
@@ -217,6 +258,15 @@ class Publisher : public PublisherBase
     message_allocator_(allocator)
   {
     allocator::set_allocator_for_deleter(&message_deleter_, message_allocator_.get());
+
+    if (event_callbacks.deadline_callback) {
+      this->add_event_handler(event_callbacks.deadline_callback,
+        RCL_PUBLISHER_OFFERED_DEADLINE_MISSED);
+    }
+    if (event_callbacks.liveliness_callback) {
+      this->add_event_handler(event_callbacks.liveliness_callback,
+        RCL_PUBLISHER_LIVELINESS_LOST);
+    }
   }
 
   virtual ~Publisher()

rclcpp/include/rclcpp/publisher_factory.hpp

@@ -75,21 +75,28 @@ struct PublisherFactory
 /// Return a PublisherFactory with functions setup for creating a PublisherT<MessageT, Alloc>.
 template<typename MessageT, typename Alloc, typename PublisherT>
 PublisherFactory
-create_publisher_factory(std::shared_ptr<Alloc> allocator)
+create_publisher_factory(
+  const PublisherEventCallbacks & event_callbacks,
+  std::shared_ptr<Alloc> allocator)
 {
   PublisherFactory factory;
 
   // factory function that creates a MessageT specific PublisherT
   factory.create_typed_publisher =
-    [allocator](
+    [event_callbacks, allocator](
     rclcpp::node_interfaces::NodeBaseInterface * node_base,
     const std::string & topic_name,
     rcl_publisher_options_t & publisher_options) -> std::shared_ptr<PublisherT>
     {
       auto message_alloc = std::make_shared<typename PublisherT::MessageAlloc>(*allocator.get());
       publisher_options.allocator = allocator::get_rcl_allocator<MessageT>(*message_alloc.get());
 
-      return std::make_shared<PublisherT>(node_base, topic_name, publisher_options, message_alloc);
+      return std::make_shared<PublisherT>(
+        node_base,
+        topic_name,
+        publisher_options,
+        event_callbacks,
+        message_alloc);
     };
 
   // function to add a publisher to the intra process manager

rclcpp/include/rclcpp/publisher_options.hpp

@@ -19,7 +19,9 @@
 #include <string>
 #include <vector>
 
+#include "rclcpp/callback_group.hpp"
 #include "rclcpp/intra_process_setting.hpp"
+#include "rclcpp/qos_event.hpp"
 #include "rclcpp/visibility_control.hpp"
 
 namespace rclcpp
@@ -29,10 +31,12 @@ namespace rclcpp
 template<typename Allocator>
 struct PublisherOptionsWithAllocator
 {
+  PublisherEventCallbacks event_callbacks;
   /// The quality of service profile to pass on to the rmw implementation.
   rmw_qos_profile_t qos_profile = rmw_qos_profile_default;
+  rclcpp::callback_group::CallbackGroup::SharedPtr callback_group;
   /// Optional custom allocator.
-  std::shared_ptr<Allocator> allocator = nullptr;
+  std::shared_ptr<Allocator> allocator;
   /// Setting to explicitly set intraprocess communications.
   IntraProcessSetting use_intra_process_comm = IntraProcessSetting::NodeDefault;
 };