Better hanlding of configuration file

Bug fixes:
proxysql stop/start was causing a crash when trying to read from a config file already closed
fixed a typo in server_capabilities
mysql_threads can now be changed if the MySQL module is not running

lib/Standard_MySQL_Thread.cpp

@@ -456,7 +456,7 @@ bool Standard_MySQL_Threads_Handler::set_variable(char *name, char *value) {	//
 			return false;
 		}
 	}
-	if (!strcmp(name,"server_capbilities")) {
+	if (!strcmp(name,"server_capabilities")) {
 		int intv=atoi(value);
 		if (intv > 10 && intv <= 65535) {
 			variables.server_capabilities=intv;
@@ -494,7 +494,7 @@ bool Standard_MySQL_Threads_Handler::set_variable(char *name, char *value) {	//
 	}
 	if (!strcmp(name,"threads")) {
 		unsigned int intv=atoi(value);
-		if ((num_threads==0 || num_threads==intv) && intv > 0 && intv < 128) {
+		if ((num_threads==0 || num_threads==intv || mysql_threads==NULL) && intv > 0 && intv < 256) {
 			num_threads=intv;
 			return true;
 		} else {
@@ -597,6 +597,7 @@ Standard_MySQL_Threads_Handler::~Standard_MySQL_Threads_Handler() {
 	if (variables.default_schema) free(variables.default_schema);
 	if (variables.server_version) free(variables.server_version);
 	free(mysql_threads);
+	mysql_threads=NULL;
 }
 
 //extern Standard_MySQL_Threads_Handler *GloMTH;

lib/Standard_ProxySQL_Admin.cpp

@@ -1580,12 +1580,22 @@ bool Standard_ProxySQL_Admin::init() {
 #endif /* DEBUG */
 
 	if (GloVars.__cmd_proxysql_reload || GloVars.__cmd_proxysql_initial) {
-			if (GloVars.configfile_open) {
-			Read_MySQL_Servers_from_configfile();	
-			Read_MySQL_Users_from_configfile();
-			Read_Global_Variables_from_configfile("admin");
-			Read_Global_Variables_from_configfile("mysql");
-			__insert_or_replace_disktable_select_maintable();
+		if (GloVars.configfile_open) {
+			if (GloVars.confFile->cfg) { 
+ 				Read_MySQL_Servers_from_configfile();	
+				Read_MySQL_Users_from_configfile();
+				Read_Global_Variables_from_configfile("admin");
+				Read_Global_Variables_from_configfile("mysql");
+				__insert_or_replace_disktable_select_maintable();
+			} else {
+				if (GloVars.confFile->OpenFile(GloVars.config_file)==true) {		
+ 					Read_MySQL_Servers_from_configfile();	
+					Read_MySQL_Users_from_configfile();
+					Read_Global_Variables_from_configfile("admin");
+					Read_Global_Variables_from_configfile("mysql");
+					__insert_or_replace_disktable_select_maintable();
+				}
+			}
 		}
 	}
 	flush_admin_variables___database_to_runtime(admindb,true);

lib/configfile.cpp

@@ -79,6 +79,7 @@ bool ProxySQL_ConfigFile::OpenFile(const char *__filename) {
 
 void ProxySQL_ConfigFile::CloseFile() {
 	delete cfg;
+	cfg=NULL;
 }
 
 bool ProxySQL_ConfigFile::ReadGlobals() {