197 lines
6.7 KiB
C
197 lines
6.7 KiB
C
#ifndef _SESSION_H
|
|
#define _SESSION_H
|
|
/*
|
|
* This file is distributed as part of the MariaDB Corporation MaxScale. It 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,
|
|
* version 2.
|
|
*
|
|
* This program 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
|
|
* this program; if not, write to the Free Software Foundation, Inc., 51
|
|
* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Copyright MariaDB Corporation Ab 2013-2014
|
|
*/
|
|
|
|
/**
|
|
* @file session.h
|
|
*
|
|
* @verbatim
|
|
* Revision History
|
|
*
|
|
* Date Who Description
|
|
* 01-06-2013 Mark Riddoch Initial implementation
|
|
* 14-06-2013 Massimiliano Pinto Added void *data to session
|
|
* for session specific data
|
|
* 01-07-2013 Massimiliano Pinto Removed backends pointer
|
|
* from struct session
|
|
* 02-09-2013 Massimiliano Pinto Added session ref counter
|
|
* 29-05-2014 Mark Riddoch Support for filter mechanism
|
|
* added
|
|
* 20-02-2015 Markus Mäkelä Added session timeouts
|
|
*
|
|
* @endverbatim
|
|
*/
|
|
#include <time.h>
|
|
#include <atomic.h>
|
|
#include <buffer.h>
|
|
#include <spinlock.h>
|
|
#include <resultset.h>
|
|
#include <skygw_utils.h>
|
|
#include <log_manager.h>
|
|
|
|
struct dcb;
|
|
struct service;
|
|
struct filter_def;
|
|
|
|
/**
|
|
* The session statistics structure
|
|
*/
|
|
typedef struct
|
|
{
|
|
time_t connect; /**< Time when the session was started */
|
|
} SESSION_STATS;
|
|
|
|
typedef enum
|
|
{
|
|
SESSION_STATE_ALLOC, /*< for all sessions */
|
|
SESSION_STATE_READY, /*< for router session */
|
|
SESSION_STATE_ROUTER_READY, /*< for router session */
|
|
SESSION_STATE_STOPPING, /*< session and router are being closed */
|
|
SESSION_STATE_LISTENER, /*< for listener session */
|
|
SESSION_STATE_LISTENER_STOPPED, /*< for listener session */
|
|
SESSION_STATE_TO_BE_FREED, /*< ready to be freed as soon as there are no references */
|
|
SESSION_STATE_FREE, /*< for all sessions */
|
|
SESSION_STATE_DUMMY /*< dummy session for consistency */
|
|
} session_state_t;
|
|
|
|
/**
|
|
* The downstream element in the filter chain. This may refer to
|
|
* another filter or to a router.
|
|
*/
|
|
typedef struct
|
|
{
|
|
void *instance;
|
|
void *session;
|
|
int (*routeQuery)(void *instance, void *session, GWBUF *request);
|
|
} DOWNSTREAM;
|
|
|
|
/**
|
|
* The upstream element in the filter chain. This may refer to
|
|
* another filter or to the protocol implementation.
|
|
*/
|
|
typedef struct
|
|
{
|
|
void *instance;
|
|
void *session;
|
|
int (*clientReply)(void *instance, void *session, GWBUF *response);
|
|
int (*error)(void *instance, void *session, void *);
|
|
} UPSTREAM;
|
|
|
|
/**
|
|
* Structure used to track the filter instances and sessions of the filters
|
|
* that are in use within a session.
|
|
*/
|
|
typedef struct
|
|
{
|
|
struct filter_def *filter;
|
|
void *instance;
|
|
void *session;
|
|
} SESSION_FILTER;
|
|
|
|
/**
|
|
* Filter type for the sessionGetList call
|
|
*/
|
|
typedef enum
|
|
{
|
|
SESSION_LIST_ALL,
|
|
SESSION_LIST_CONNECTION
|
|
} SESSIONLISTFILTER;
|
|
|
|
/**
|
|
* The session status block
|
|
*
|
|
* A session status block is created for each user (client) connection
|
|
* to the database, it links the descriptors, routing implementation
|
|
* and originating service together for the client session.
|
|
*/
|
|
typedef struct session
|
|
{
|
|
#if defined(SS_DEBUG)
|
|
skygw_chk_t ses_chk_top;
|
|
#endif
|
|
SPINLOCK ses_lock;
|
|
session_state_t state; /*< Current descriptor state */
|
|
size_t ses_id; /*< Unique session identifier */
|
|
int enabled_log_priorities; /*< Bitfield of enabled syslog priorities */
|
|
struct dcb *client_dcb; /*< The client connection */
|
|
void *router_session; /*< The router instance data */
|
|
SESSION_STATS stats; /*< Session statistics */
|
|
struct service *service; /*< The service this session is using */
|
|
int n_filters; /*< Number of filter sessions */
|
|
SESSION_FILTER *filters; /*< The filters in use within this session */
|
|
DOWNSTREAM head; /*< Head of the filter chain */
|
|
UPSTREAM tail; /*< The tail of the filter chain */
|
|
struct session *next; /*< Linked list of all sessions */
|
|
int refcount; /*< Reference count on the session */
|
|
bool ses_is_child; /*< this is a child session */
|
|
#if defined(SS_DEBUG)
|
|
skygw_chk_t ses_chk_tail;
|
|
#endif
|
|
} SESSION;
|
|
|
|
/** Whether to do session timeout checks */
|
|
extern bool check_timeouts;
|
|
|
|
/** When the next timeout check is done. This is compared to hkheartbeat in
|
|
* hk_heartbeat.h */
|
|
extern long next_timeout_check;
|
|
|
|
#define SESSION_PROTOCOL(x, type) DCB_PROTOCOL((x)->client_dcb, type)
|
|
|
|
/**
|
|
* A convenience macro that can be used by the protocol modules to route
|
|
* the incoming data to the first element in the pipeline of filters and
|
|
* routers.
|
|
*/
|
|
#define SESSION_ROUTE_QUERY(sess, buf) \
|
|
((sess)->head.routeQuery)((sess)->head.instance, \
|
|
(sess)->head.session, (buf))
|
|
/**
|
|
* A convenience macro that can be used by the router modules to route
|
|
* the replies to the first element in the pipeline of filters and
|
|
* the protocol.
|
|
*/
|
|
#define SESSION_ROUTE_REPLY(sess, buf) \
|
|
((sess)->tail.clientReply)((sess)->tail.instance, \
|
|
(sess)->tail.session, (buf))
|
|
|
|
SESSION *get_all_sessions();
|
|
SESSION *session_alloc(struct service *, struct dcb *);
|
|
SESSION *session_set_dummy(struct dcb *);
|
|
bool session_free(SESSION *);
|
|
int session_isvalid(SESSION *);
|
|
int session_reply(void *inst, void *session, GWBUF *data);
|
|
char *session_get_remote(SESSION *);
|
|
char *session_getUser(SESSION *);
|
|
void printAllSessions();
|
|
void printSession(SESSION *);
|
|
void dprintAllSessions(struct dcb *);
|
|
void dprintSession(struct dcb *, SESSION *);
|
|
void dListSessions(struct dcb *);
|
|
char *session_state(int);
|
|
bool session_link_dcb(SESSION *, struct dcb *);
|
|
int session_unlink_dcb(SESSION*, DCB*);
|
|
SESSION* get_session_by_router_ses(void* rses);
|
|
void session_enable_log_priority(SESSION* ses, int priority);
|
|
void session_disable_log_priority(SESSION* ses, int priority);
|
|
RESULTSET *sessionGetList(SESSIONLISTFILTER);
|
|
void process_idle_sessions();
|
|
void enable_session_timeouts();
|
|
#endif
|