Avoid crash in JSON library for invalid UTF8

lib/MySQL_Logger.cpp

@@ -229,7 +229,7 @@ void MySQL_Event::write_auth(std::fstream *f, MySQL_Session *sess) {
 	// for performance reason, we are moving the write lock
 	// right before the write to disk
 	GloMyLogger->wrlock();
-	*f << j.dump() << std::endl;
+	*f << j.dump(-1, ' ', false, json::error_handler_t::replace) << std::endl;
 }
 
 uint64_t MySQL_Event::write_query_format_1(std::fstream *f) {
@@ -402,7 +402,7 @@ uint64_t MySQL_Event::write_query_format_2_json(std::fstream *f) {
 	// right before the write to disk
 	GloMyLogger->wrlock();
 
-	*f << j.dump() << std::endl;
+	*f << j.dump(-1, ' ', false, json::error_handler_t::replace) << std::endl;
 	return total_bytes; // always 0
 }
 

lib/MySQL_Session.cpp

@@ -1050,7 +1050,7 @@ void MySQL_Session::return_proxysql_internal(PtrSize_t *pkt) {
 	if (pkt->size==(5+l) && strncasecmp((char *)"PROXYSQL INTERNAL SESSION", (char *)pkt->ptr+5, l)==0) {
 		json j;
 		generate_proxysql_internal_session_json(j);
-		std::string s = j.dump(4);
+		std::string s = j.dump(4, ' ', false, json::error_handler_t::replace);
 		SQLite3_result *resultset = new SQLite3_result(1);
 		resultset->add_column_definition(SQLITE_TEXT,"session_info");
 		char *pta[1];

lib/MySQL_Thread.cpp

@@ -5564,10 +5564,10 @@ SQLite3_result * MySQL_Threads_Handler::SQL3_Processlist() {
 					json j;
 					sess->generate_proxysql_internal_session_json(j);
 					if (mysql_thread___show_processlist_extended == 2) {
-						std::string s = j.dump(4);
+						std::string s = j.dump(4, ' ', false, json::error_handler_t::replace);
 						pta[15] = strdup(s.c_str());
 					} else {
-						std::string s = j.dump();
+						std::string s = j.dump(-1, ' ', false, json::error_handler_t::replace);
 						pta[15] = strdup(s.c_str());
 					}
 				}