#ifndef _SESSION_TABLE_H
#define _SESSION_TABLE_H

#ifdef __cpluscplus
extern "C"
{
#endif

#include <stdint.h>
#include <sys/types.h>

#include "uthash.h"
#include "addr_tuple4.h"

// Note: session_addr must be initialized by memset(0) before use !!!

typedef void fn_free_cb(void *args);

struct session_node
{
    uint64_t session_id;             /* first key */
    struct addr_tuple4 session_addr; /* second key */

    void *val_data;
    fn_free_cb *val_freecb;

    UT_hash_handle hh1; /* handle for first hash table */
    UT_hash_handle hh2; /* handle for second hash table */
};

struct session_table;

struct session_table *session_table_create();
void session_table_destory(struct session_table *table);
uint64_t session_table_count(struct session_table *table);

// session_addr : deep copy
// val_data     : shallow copy (malloc by user, free by val_freecb)
// return  0 : suceess
// return -1 : key exists
int session_table_insert(struct session_table *table, uint64_t session_id, const struct addr_tuple4 *session_addr, void *val_data, const fn_free_cb *val_freecb);

// return  0 : success
// return -1 : key not exists
int session_table_delete_by_id(struct session_table *table, uint64_t session_id);
int session_table_delete_by_addr(struct session_table *table, const struct addr_tuple4 *session_addr);

// return   NULL : key not exists
// return UnNULL : success
struct session_node *session_table_search_by_id(struct session_table *table, uint64_t session_id);
struct session_node *session_table_search_by_addr(struct session_table *table, const struct addr_tuple4 *session_addr);

#ifdef __cpluscplus
}
#endif

#endif