feat: abort messages

core/include/detray/navigation/direct_navigator.hpp

@@ -222,12 +222,18 @@ class direct_navigator {
         }
 
         DETRAY_HOST_DEVICE
-        inline auto abort() -> bool {
+        inline auto abort(const char * = nullptr) -> bool {
             m_status = navigation::status::e_abort;
             m_heartbeat = false;
             return m_heartbeat;
         }
 
+        template <typename debug_msg_generator_t>
+        DETRAY_HOST_DEVICE inline auto abort(const debug_msg_generator_t &)
+            -> bool {
+            return abort();
+        }
+
         DETRAY_HOST_DEVICE
         inline auto exit() -> bool {
             m_status = navigation::status::e_on_target;

core/include/detray/navigation/navigator.hpp

@@ -394,15 +394,54 @@ class navigator {
         /// Navigation state that cannot be recovered from. Leave the other
         /// data for inspection.
         ///
+        /// @param custom_msg additional information on the reason for the error
+        ///
         /// @return navigation heartbeat (dead)
         DETRAY_HOST_DEVICE
-        inline auto abort() -> bool {
+        inline auto abort(const char *custom_msg = "Navigator (unkown reason)")
+            -> bool {
             m_status = navigation::status::e_abort;
             m_heartbeat = false;
             // Don't do anything if aborted
             m_trust_level = navigation::trust_level::e_full;
+
+            /// Wrapper around the custom message that a print inspector can
+            /// understand
+            struct message_wrapper {
+                const char *const m_msg{nullptr};
+
+                DETRAY_HOST_DEVICE
+                constexpr const char *operator()() const { return m_msg; }
+            };
+
+            assert(custom_msg != nullptr);
+            run_inspector({}, point3_type{0.f, 0.f, 0.f},
+                          vector3_type{0.f, 0.f, 0.f},
+                          "Aborted: ", message_wrapper{custom_msg});
+
+            return m_heartbeat;
+        }
+
+        /// Navigation state that cannot be recovered from. Leave the other
+        /// data for inspection.
+        ///
+        /// @param debug_msg_generator functor that returns additional
+        ///                            information on the reason for the error
+        ///
+        /// @return navigation heartbeat (dead)
+        template <typename debug_msg_generator_t>
+        requires(!std::same_as<char *, debug_msg_generator_t>)
+            DETRAY_HOST_DEVICE
+            inline auto abort(const debug_msg_generator_t &debug_msg_generator)
+                -> bool {
+            m_status = navigation::status::e_abort;
+            m_heartbeat = false;
+            m_trust_level = navigation::trust_level::e_full;
+
             run_inspector({}, point3_type{0.f, 0.f, 0.f},
-                          vector3_type{0.f, 0.f, 0.f}, "Aborted: ");
+                          vector3_type{0.f, 0.f, 0.f},
+                          "Aborted: ", debug_msg_generator);
+
             return m_heartbeat;
         }
 
@@ -579,6 +618,20 @@ class navigator {
             }
         }
 
+        /// Call the navigation inspector
+        template <typename debug_msg_generator_t>
+        DETRAY_HOST_DEVICE inline void run_inspector(
+            [[maybe_unused]] const navigation::config &cfg,
+            [[maybe_unused]] const point3_type &track_pos,
+            [[maybe_unused]] const vector3_type &track_dir,
+            [[maybe_unused]] const char *message,
+            [[maybe_unused]] const debug_msg_generator_t &msg_gen) {
+            if constexpr (!std::is_same_v<inspector_t,
+                                          navigation::void_inspector>) {
+                m_inspector(*this, cfg, track_pos, track_dir, message, msg_gen);
+            }
+        }
+
         /// Our cache of candidates (intersections with any kind of surface)
         candidate_cache_t m_candidates;
 
@@ -788,7 +841,7 @@ class navigator {
         // Unrecoverable
         if (navigation.trust_level() != navigation::trust_level::e_full ||
             navigation.is_exhausted()) {
-            navigation.abort();
+            navigation.abort("Navigator: No reachable surfaces");
         }
 
         return is_init;

core/include/detray/propagator/actors/aborters.hpp

@@ -58,7 +58,8 @@ struct pathlimit_aborter : actor {
         // Check the path limit
         if (step_limit <= 0.f) {
             // Stop navigation
-            prop_state._heartbeat &= nav_state.abort();
+            prop_state._heartbeat &=
+                nav_state.abort("Aborter: Maximal path length reached");
         }
 
         // Don't go over the path limit in the next step
@@ -123,7 +124,8 @@ struct momentum_aborter : actor {
 
         if (mag <= abrt_state.p_limit()) {
             // Stop navigation
-            prop_state._heartbeat &= nav_state.abort();
+            prop_state._heartbeat &=
+                nav_state.abort("Aborter: Minimum momentum reached");
         }
     }
 };
@@ -153,7 +155,8 @@ struct target_aborter : actor {
         if (navigation.is_on_surface() &&
             (navigation.barcode() == abrt_state._target_surface) &&
             (stepping.path_length() > 0.f)) {
-            prop_state._heartbeat &= navigation.abort();
+            prop_state._heartbeat &=
+                navigation.abort("Aborter: Reached target surface");
         }
     }
 };

tests/include/detray/test/utils/inspectors.hpp

@@ -56,32 +56,38 @@ struct aggregate_inspector {
 
     /// Inspector interface
     template <unsigned int current_id = 0, typename state_type,
-              concepts::point3D point3_t, concepts::vector3D vector3_t>
+              concepts::point3D point3_t, concepts::vector3D vector3_t,
+              typename... Args>
     DETRAY_HOST_DEVICE auto operator()(state_type &state,
                                        const navigation::config &cfg,
                                        const point3_t &pos,
                                        const vector3_t &dir,
-                                       const char *message) {
+                                       const char *message, Args &&... args) {
         // Call inspector
-        std::get<current_id>(_inspectors)(state, cfg, pos, dir, message);
+        std::get<current_id>(_inspectors)(state, cfg, pos, dir, message,
+                                          std::forward<Args>(args)...);
 
         // Next inspector
         if constexpr (current_id <
                       std::tuple_size<inspector_tuple_t>::value - 1) {
-            return operator()<current_id + 1>(state, cfg, pos, dir, message);
+            return operator()<current_id + 1>(state, cfg, pos, dir, message,
+                                              std::forward<Args>(args)...);
         }
     }
 
     /// Inspector interface
-    template <unsigned int current_id = 0, typename state_type>
-    DETRAY_HOST_DEVICE auto operator()(state_type &state, const char *message) {
+    template <unsigned int current_id = 0, typename state_type,
+              typename... Args>
+    DETRAY_HOST_DEVICE auto operator()(state_type &state, const char *message,
+                                       Args &&... args) {
         // Call inspector
         std::get<current_id>(_inspectors)(state, message);
 
         // Next inspector
         if constexpr (current_id <
                       std::tuple_size<inspector_tuple_t>::value - 1) {
-            return operator()<current_id + 1>(state, message);
+            return operator()<current_id + 1>(state, message,
+                                              std::forward<Args>(args)...);
         }
     }
 
@@ -191,12 +197,12 @@ struct object_tracer {
 
     /// Inspector interface
     template <typename state_type, concepts::point3D point3_t,
-              concepts::vector3D vector3_t>
+              concepts::vector3D vector3_t, typename... Args>
     DETRAY_HOST_DEVICE auto operator()(const state_type &state,
                                        const navigation::config &,
                                        const point3_t &pos,
                                        const vector3_t &dir,
-                                       const char * /*message*/) {
+                                       const char * /*message*/, Args &&...) {
 
         // Record the candidate of an encountered object
         if ((is_status(state.status(), navigation_status) || ...)) {
@@ -245,6 +251,8 @@ struct print_inspector {
     using view_type = dvector_view<char>;
     using const_view_type = dvector_view<const char>;
 
+    struct void_generator {};
+
     /// Default constructor
     print_inspector() = default;
 
@@ -272,17 +280,24 @@ struct print_inspector {
     /// Move assignemten operator
     print_inspector &operator=(print_inspector &&other) = default;
 
-    /// Gathers navigation information accross navigator update calls
-    std::stringstream debug_stream{};
-
     /// Inspector interface. Gathers detailed information during navigation
     template <typename state_type, concepts::point3D point3_t,
-              concepts::vector3D vector3_t>
+              concepts::vector3D vector3_t,
+              typename message_generator_t = void_generator>
     auto operator()(const state_type &state, const navigation::config &cfg,
                     const point3_t &track_pos, const vector3_t &track_dir,
-                    const char *message) {
+                    const char *message,
+                    const message_generator_t &msg_gen = {}) {
         std::string msg(message);
-        debug_stream << msg << std::endl;
+        debug_stream << msg;
+        if constexpr (!std::same_as<message_generator_t, void_generator>) {
+            debug_stream << msg_gen();
+
+            if (state.status() == navigation::status::e_abort) {
+                fata_error_msg = msg_gen();
+            }
+        }
+        debug_stream << std::endl;
         debug_stream << "----------------------------------------" << std::endl;
 
         debug_stream << navigation::print_state(state);
@@ -293,10 +308,20 @@ struct print_inspector {
     }
 
     /// Inspector interface. Print basic state information
-    template <typename state_type>
-    auto operator()(const state_type &state, const char *message) {
+    template <typename state_type,
+              typename message_generator_t = void_generator>
+    auto operator()(const state_type &state, const char *message,
+                    const message_generator_t &msg_gen = {}) {
         std::string msg(message);
-        debug_stream << msg << std::endl;
+        debug_stream << msg;
+        if constexpr (!std::same_as<message_generator_t, void_generator>) {
+            debug_stream << msg_gen();
+
+            if (state.status() == navigation::status::e_abort) {
+                fata_error_msg = msg_gen();
+            }
+        }
+        debug_stream << std::endl;
         debug_stream << "----------------------------------------" << std::endl;
 
         debug_stream << navigation::print_state(state);
@@ -306,6 +331,11 @@ struct print_inspector {
 
     /// @returns a string representation of the gathered information
     std::string to_string() const { return debug_stream.str(); }
+
+    /// Gathers navigation information accross navigator update calls
+    std::stringstream debug_stream{};
+    /// Special message that is collected if the navigator hits a fatal error
+    std::string fata_error_msg{""};
 };
 
 }  // namespace navigation

tests/include/detray/test/validation/navigation_validation_utils.hpp

@@ -1074,10 +1074,10 @@ auto compare_to_navigation(
 
         // Fatal propagation error: Data unreliable
         if (!success) {
-            std::cout << "ERROR: Propagation failure" << std::endl;
+            std::cout << "ERROR: Propagation aborted! "
+                      << nav_printer.fata_error_msg << std::endl;
 
-            *debug_file << "ERROR: Propagation failure:\n"
-                        << "TEST TRACK " << i;
+            *debug_file << "ERROR: Propagation aborted:" << std::endl;
 
             n_fatal_error++;
         }