Drafting tracking of GTID

include/MySQL_HostGroups_Manager.h

@@ -2,6 +2,7 @@
 #define __CLASS_MYSQL_HOSTGROUPS_MANAGER_H
 #include "proxysql.h"
 #include "cpp.h"
+#include "proxysql_gtid.h"
 
 #include <thread>
 
@@ -183,6 +184,9 @@ class MySQL_HostGroups_Manager {
 
 	std::thread *HGCU_thread;
 
+	std::unordered_map <string, Gtid_Server_Info *> gtid_map;
+	pthread_rwlock_t gtid_rwlock;
+
 	public:
 	struct {
 		unsigned int servers_table_version;

include/proxysql_gtid.h

@@ -0,0 +1,21 @@
+#ifndef PROXYSQL_GTID
+#define PROXYSQL_GTID
+// highly inspired by libslave
+// https://github.com/vozbu/libslave/
+#include <unordered_map>
+#include <list>
+#include <utility>
+
+typedef std::pair<std::string, int64_t> gtid_t;
+typedef std::pair<int64_t, int64_t> gtid_interval_t;
+typedef std::unordered_map<std::string, std::list<gtid_interval_t>> gtid_set_t;
+
+class Gtid_Server_Info {
+	gtid_set_t executed_gtid_set;
+	char *address;
+	uint16_t mysql_port;
+	uint16_t gtid_port;
+	bool active;
+};
+
+#endif /* PROXYSQL_GTID */