WIP: New wsrep-lib informative assert

Example:
2023-08-31  8:26:32 1 [ERROR] WSREP: Assertion: '(0 && (state() == s_preparing || (is_xa() && state() == s_replaying) || (ret && (state() == s_must_abort || state() == s_must_replay || state() == s_cert_failed || state() == s_aborted))))' failed in: /home/jan/work/mariadb/10.4/wsrep-lib/src/transaction.cpp:387 Info: ::before_prepare_leave : ret=0 error=success state=preparing

include/wsrep/assert.hpp

@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2023 Codership Oy <info@codership.com>
+ *
+ * This file is part of wsrep-lib.
+ *
+ * Wsrep-lib is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Wsrep-lib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wsrep-lib.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef WSREP_ASSERT_HPP
+#define WSREP_ASSERT_HPP
+
+/** @file assert.hpp
+ *
+ * Wsrep library informative assert.
+ */
+
+#include <assert.h>
+
+/**
+ * Function to do informative assert with actual file name,
+ * line and formatted info text.
+ *
+ * @param expr Assertion expression string
+ * @param file File name string
+ * @param line File line number
+ * @param info Formatted info text
+ *
+*/
+void wsrep_info_assert(const char* expr, const char* file, const int line, const char* info);
+
+/**
+ * Function to create informative text from format
+ * and variable number of parameters
+ *
+ * @param format strict
+ * @param ... variable number of parameters
+ *
+ * @retval Formated informative text
+ *
+*/
+char* wsrep_info_assert_text(const char* format, ...);
+
+/**
+ * Macro for informative assert. First actual expression
+ * is printed and then informative text provided by
+ * developer.
+ *
+ * @param exp assertion expression
+ * @param p Informative text format and parameters 
+ *
+ * usage : WSREP_INFO_ASSERT((EXPR), (format, format_param,...))
+ * example : WSREP_INFO_ASSERT(0, ("This is always false=%d", 0));
+ *
+*/
+#ifdef NDEBUG
+#define WSREP_INFO_ASSERT(exp, p) (__ASSERT_VOID_CAST (0))
+#else
+#define WSREP_INFO_ASSERT(exp, p) do {                     \
+  if (__builtin_expect((!(exp)), false))                   \
+  {                                                        \
+    wsrep_info_assert(#exp, __FILE__, __LINE__,            \
+                      wsrep_info_assert_text p);           \
+    assert(exp);                                           \
+  }                                                        \
+} while (0)
+#endif // NDEBUG
+
+#endif // WSREP_ASSERT_HPP

src/CMakeLists.txt

@@ -4,6 +4,7 @@
 
 add_library(wsrep-lib
   allowlist_service_v1.cpp
+  assert.cpp
   client_state.cpp
   config_service_v1.cpp
   event_service_v1.cpp

src/assert.cpp

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2023 Codership Oy <info@codership.com>
+ *
+ * This file is part of wsrep-lib.
+ *
+ * Wsrep-lib is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Wsrep-lib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wsrep-lib.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/** @file assert.cpp
+ *
+ * Wsrep library informative assert.
+ */
+
+#include <cassert>
+#include <cstring>
+#include <stdarg.h>
+#include <stdio.h>
+#include "wsrep/logger.hpp"
+
+/**
+ * Function to create informative text from format
+ * and variable number of parameters
+ *
+ * @param format text format strict
+ * @param ... variable number of parameters
+ *
+ * @retval Formated informative text
+ *
+*/
+#define WSREP_MAX_INFO_BUF 1024
+
+char* wsrep_info_assert_text(const char* format, ...)
+{
+  static char wsrep_buf[WSREP_MAX_INFO_BUF];
+  va_list ap;
+
+  va_start(ap, format);
+  int n= vsnprintf(wsrep_buf, WSREP_MAX_INFO_BUF,(char *)format, ap);
+  if (n >= WSREP_MAX_INFO_BUF)
+  {
+    wsrep::log_debug() << "wsrep_info_assert_text too long and truncated"
+                       << " used length: " << WSREP_MAX_INFO_BUF
+                       << " needed lenght: " << n;
+  }
+  va_end(ap);
+  return wsrep_buf;
+}
+
+/**
+ * Function to do informative assert with actual file name,
+ * line and formatted info text. Function will not return.
+ *
+ * @param file File name string
+ * @param line File line number
+ * @param info Formatted info text
+ *
+*/
+void wsrep_info_assert(const char* expr, const char* file, const int line, const char* info)
+{
+  wsrep::log_error() << "Assertion: '" << expr << "' failed in: " << file << ":" << line
+                     << " Info: " << info;
+}

src/transaction.cpp

@@ -27,6 +27,7 @@
 #include "wsrep/compiler.hpp"
 #include "wsrep/server_service.hpp"
 #include "wsrep/client_service.hpp"
+#include "wsrep/assert.hpp"
 
 #include <cassert>
 #include <sstream>
@@ -346,10 +347,14 @@ int wsrep::transaction::before_prepare(
                 ret = certify_commit(lock);
             }
 
-            assert((ret == 0 && state() == s_preparing) ||
+            WSREP_INFO_ASSERT(((ret == 0 && state() == s_preparing) ||
                    (state() == s_must_abort ||
                     state() == s_must_replay ||
-                    state() == s_cert_failed));
+                    state() == s_cert_failed)),
+		   ("::before_prepare : ret=%d error=%s state=%s\n",
+                    ret,
+                    to_c_string(client_state_.current_error()),
+                    to_c_string(state())));
 
             if (ret)
             {
@@ -379,12 +384,17 @@ int wsrep::transaction::before_prepare(
         break;
     }
 
-    assert(state() == s_preparing ||
+    WSREP_INFO_ASSERT((state() == s_preparing ||
            (is_xa() && state() == s_replaying) ||
            (ret && (state() == s_must_abort ||
                     state() == s_must_replay ||
                     state() == s_cert_failed ||
-                    state() == s_aborted)));
+                    state() == s_aborted))),
+		   ("::before_prepare_leave : ret=%d error=%s state=%s\n",
+                    ret,
+                    to_c_string(client_state_.current_error()),
+                    to_c_string(state())));
+
     debug_log_state("before_prepare_leave");
     return ret;
 }