refactor fatal call (#511)

* refactor fatal handling

src/g3log.cpp

@@ -148,45 +148,48 @@ namespace g3 {
          message.get()->setExpression(boolean_expression);
 
          if (internal::wasFatal(level)) {
-            auto fatalhook = g_fatal_pre_logging_hook;
-            // In case the fatal_pre logging actually will cause a crash in its turn
-            // let's not do recursive crashing!
-            setFatalPreLoggingHook(g_pre_fatal_hook_that_does_nothing);
-            ++g_fatal_hook_recursive_counter;  // thread safe counter
-            // "benign" race here. If two threads crashes, with recursive crashes
-            // then it's possible that the "other" fatal stack trace will be shown
-            // that's OK since it was anyhow the first crash detected
-            static const std::string first_stack_trace = stack_trace;
-            fatalhook();
-            message.get()->write().append(stack_trace);
-
-            if (g_fatal_hook_recursive_counter.load() > 1) {
-               message.get()->write().append(
-                                        "\n\n\nWARNING\n"
-                                        "A recursive crash detected. It is likely the hook set with 'setFatalPreLoggingHook(...)' is responsible\n\n")
-                  .append("---First crash stacktrace: ")
-                  .append(first_stack_trace)
-                  .append("\n---End of first stacktrace\n");
-            }
-            FatalMessagePtr fatal_message{std::make_unique<FatalMessage>(*(message._move_only.get()), fatal_signal)};
-            // At destruction, flushes fatal message to g3LogWorker
-            // either we will stay here until the background worker has received the fatal
-            // message, flushed the crash message to the sinks and exits with the same fatal signal
-            //..... OR it's in unit-test mode then we throw a std::runtime_error (and never hit sleep)
-            fatalCall(fatal_message);
+            saveFatalMessage(level, stack_trace, message, fatal_signal);
          } else {
             pushMessageToLogger(message);
          }
       }
 
+      void saveFatalMessage(const LEVELS& level, const char* stack_trace, g3::LogMessagePtr& message, int& fatal_signal) {
+         auto fatalhook = g_fatal_pre_logging_hook;
+         // In case the fatal_pre logging actually will cause a crash in its turn
+         // let's not do recursive crashing!
+         setFatalPreLoggingHook(g_pre_fatal_hook_that_does_nothing);
+         ++g_fatal_hook_recursive_counter;  // thread safe counter
+         // "benign" race here. If two threads crashes, with recursive crashes
+         // then it's possible that the "other" fatal stack trace will be shown
+         // that's OK since it was anyhow the first crash detected
+         static const std::string first_stack_trace = stack_trace;
+         fatalhook();
+         message.get()->write().append(stack_trace);
+
+         if (g_fatal_hook_recursive_counter.load() > 1) {
+            message.get()->write().append(
+                                     "\n\n\nWARNING\n"
+                                     "A recursive crash detected. It is likely the hook set with 'setFatalPreLoggingHook(...)' is responsible\n\n")
+               .append("---First crash stacktrace: ")
+               .append(first_stack_trace)
+               .append("\n---End of first stacktrace\n");
+         }
+         FatalMessagePtr fatal_message{std::make_unique<FatalMessage>(*(message._move_only.get()), fatal_signal)};
+         // At destruction, flushes fatal message to g3LogWorker
+         // either we will stay here until the background worker has received the fatal
+         // message, flushed the crash message to the sinks and exits with the same fatal signal
+         //..... OR it's in unit-test mode then we throw a std::runtime_error (and never hit sleep)
+         fatalCall(fatal_message);
+      }
       /**
-       * save the message to the logger. In case of called before the logger is instantiated
-       * the first message will be saved. Any following subsequent uninitialized log calls
-       * will be ignored.
-       *
-       * The first initialized log entry will also save the first uninitialized log message, if any
-       * @param log_entry to save to logger
-       */
+            * save the message to the logger. In case of called before the logger is instantiated
+            * the first message will be saved. Any following subsequent uninitialized log calls
+            * will be ignored.
+            *
+            * The first initialized log entry will also save the first uninitialized log message, if any
+            * @param log_entry to save to logger
+            */
       void pushMessageToLogger(LogMessagePtr incoming) {  // todo rename to Push SavedMessage To Worker
          // Uninitialized messages are ignored but does not CHECK/crash the logger
          if (!internal::isLoggingInitialized()) {
@@ -196,9 +199,8 @@ namespace g3 {
                err.append(g_first_uninitialized_msg->message());
                std::string& str = g_first_uninitialized_msg->write();
                str.clear();
-               str.append(err);  // replace content
-               std::cerr << str << std::endl;
-            });
+               str.append(err); // replace content
+               std::cerr << str << std::endl; });
             return;
          }
 
@@ -207,10 +209,10 @@ namespace g3 {
       }
 
       /** Fatal call saved to logger. This will trigger SIGABRT or other fatal signal
-       * to exit the program. After saving the fatal message the calling thread
-       * will sleep forever (i.e. until the background thread catches up, saves the fatal
-       * message and kills the software with the fatal signal.
-       */
+          * to exit the program. After saving the fatal message the calling thread
+          * will sleep forever (i.e. until the background thread catches up, saves the fatal
+          * message and kills the software with the fatal signal.
+          */
       void pushFatalMessageToLogger(FatalMessagePtr message) {
          if (!isLoggingInitialized()) {
             std::ostringstream error;
@@ -228,10 +230,10 @@ namespace g3 {
       }
 
       /** The default, initial, handling to send a 'fatal' event to g3logworker
-       *  the caller will stay here, eternally, until the software is aborted
-       * ... in the case of unit testing it is the given "Mock" fatalCall that will
-       * define the behaviour.
-       */
+          *  the caller will stay here, eternally, until the software is aborted
+          * ... in the case of unit testing it is the given "Mock" fatalCall that will
+          * define the behaviour.
+          */
       void fatalCall(FatalMessagePtr message) {
          g_fatal_to_g3logworker_function_ptr(FatalMessagePtr{std::move(message)});
       }

src/g3log/g3log.hpp

@@ -106,6 +106,8 @@ namespace g3 {
       void saveMessage(const char* message, const char* file, int line, const char* function, const LEVELS& level,
                        const char* boolean_expression, int fatal_signal, const char* stack_trace);
 
+      void saveFatalMessage(const LEVELS& level, const char* stack_trace, g3::LogMessagePtr& message, int& fatal_signal);
+
       // forwards the message to all sinks
       void pushMessageToLogger(LogMessagePtr log_entry);