03dbc6df80
- STRERROR_BUFLEN moved to cdefs.h and renamed to MXS_STRERROR_BUFLEN. Better would be to provide a 'const char* mxs_strerror(int errno)' that would have a thread specific buffer for the error message. - MIN and MAX also moved to defs.h as MXS_MIN and MXS_MAX. - Now only mlist.h of the headers depend upon skygw_utils.h.
212 lines
6.9 KiB
C
212 lines
6.9 KiB
C
#pragma once
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#ifndef _MAXSCALE_SESSION_H
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#define _MAXSCALE_SESSION_H
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/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl.
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*
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* Change Date: 2019-07-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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/**
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* @file session.h
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 01-06-2013 Mark Riddoch Initial implementation
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* 14-06-2013 Massimiliano Pinto Added void *data to session
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* for session specific data
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* 01-07-2013 Massimiliano Pinto Removed backends pointer
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* from struct session
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* 02-09-2013 Massimiliano Pinto Added session ref counter
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* 29-05-2014 Mark Riddoch Support for filter mechanism
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* added
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* 20-02-2015 Markus Mäkelä Added session timeouts
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* 27/06/2016 Martin Brampton Modify session struct for list manager
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*
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* @endverbatim
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*/
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#include <maxscale/cdefs.h>
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#include <time.h>
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#include <maxscale/atomic.h>
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#include <maxscale/buffer.h>
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#include <maxscale/listmanager.h>
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#include <maxscale/spinlock.h>
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#include <maxscale/resultset.h>
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#include <maxscale/log_manager.h>
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MXS_BEGIN_DECLS
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struct dcb;
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struct service;
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struct filter_def;
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/**
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* The session statistics structure
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*/
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typedef struct
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{
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time_t connect; /**< Time when the session was started */
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} SESSION_STATS;
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#define SESSION_STATS_INIT {0}
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typedef enum
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{
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SESSION_STATE_ALLOC, /*< for all sessions */
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SESSION_STATE_READY, /*< for router session */
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SESSION_STATE_ROUTER_READY, /*< for router session */
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SESSION_STATE_STOPPING, /*< session and router are being closed */
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SESSION_STATE_LISTENER, /*< for listener session */
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SESSION_STATE_LISTENER_STOPPED, /*< for listener session */
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SESSION_STATE_TO_BE_FREED, /*< ready to be freed as soon as there are no references */
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SESSION_STATE_FREE, /*< for all sessions */
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SESSION_STATE_DUMMY /*< dummy session for consistency */
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} session_state_t;
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/**
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* The downstream element in the filter chain. This may refer to
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* another filter or to a router.
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*/
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typedef struct
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{
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void *instance;
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void *session;
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int (*routeQuery)(void *instance, void *session, GWBUF *request);
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} DOWNSTREAM;
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#define DOWNSTREAM_INIT {0}
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/**
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* The upstream element in the filter chain. This may refer to
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* another filter or to the protocol implementation.
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*/
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typedef struct
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{
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void *instance;
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void *session;
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int (*clientReply)(void *instance, void *session, GWBUF *response);
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int (*error)(void *instance, void *session, void *);
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} UPSTREAM;
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#define UPSTREAM_INIT {0}
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/**
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* Structure used to track the filter instances and sessions of the filters
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* that are in use within a session.
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*/
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typedef struct
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{
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struct filter_def *filter;
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void *instance;
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void *session;
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} SESSION_FILTER;
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#define SESSION_FILTER_INIT {0}
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/**
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* Filter type for the sessionGetList call
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*/
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typedef enum
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{
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SESSION_LIST_ALL,
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SESSION_LIST_CONNECTION
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} SESSIONLISTFILTER;
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/**
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* The session status block
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*
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* A session status block is created for each user (client) connection
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* to the database, it links the descriptors, routing implementation
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* and originating service together for the client session.
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*
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* Note that the first few fields (up to and including "entry_is_ready") must
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* precisely match the LIST_ENTRY structure defined in the list manager.
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*/
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typedef struct session
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{
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LIST_ENTRY_FIELDS
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skygw_chk_t ses_chk_top;
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SPINLOCK ses_lock;
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session_state_t state; /*< Current descriptor state */
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size_t ses_id; /*< Unique session identifier */
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int enabled_log_priorities; /*< Bitfield of enabled syslog priorities */
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struct dcb *client_dcb; /*< The client connection */
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void *router_session; /*< The router instance data */
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SESSION_STATS stats; /*< Session statistics */
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struct service *service; /*< The service this session is using */
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int n_filters; /*< Number of filter sessions */
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SESSION_FILTER *filters; /*< The filters in use within this session */
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DOWNSTREAM head; /*< Head of the filter chain */
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UPSTREAM tail; /*< The tail of the filter chain */
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int refcount; /*< Reference count on the session */
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bool ses_is_child; /*< this is a child session */
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skygw_chk_t ses_chk_tail;
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} SESSION;
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#define SESSION_INIT {.ses_chk_top = CHK_NUM_SESSION, .ses_lock = SPINLOCK_INIT, \
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.stats = SESSION_STATS_INIT, .head = DOWNSTREAM_INIT, .tail = UPSTREAM_INIT, \
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.state = SESSION_STATE_ALLOC, .ses_chk_tail = CHK_NUM_SESSION}
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/** Whether to do session timeout checks */
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extern bool check_timeouts;
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/** When the next timeout check is done. This is compared to hkheartbeat in
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* hk_heartbeat.h */
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extern long next_timeout_check;
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#define SESSION_PROTOCOL(x, type) DCB_PROTOCOL((x)->client_dcb, type)
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/**
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* A convenience macro that can be used by the protocol modules to route
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* the incoming data to the first element in the pipeline of filters and
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* routers.
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*/
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#define SESSION_ROUTE_QUERY(sess, buf) \
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((sess)->head.routeQuery)((sess)->head.instance, \
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(sess)->head.session, (buf))
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/**
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* A convenience macro that can be used by the router modules to route
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* the replies to the first element in the pipeline of filters and
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* the protocol.
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*/
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#define SESSION_ROUTE_REPLY(sess, buf) \
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((sess)->tail.clientReply)((sess)->tail.instance, \
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(sess)->tail.session, (buf))
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SESSION *session_alloc(struct service *, struct dcb *);
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bool session_pre_alloc(int number);
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SESSION *session_set_dummy(struct dcb *);
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bool session_free(SESSION *);
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int session_isvalid(SESSION *);
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int session_reply(void *inst, void *session, GWBUF *data);
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char *session_get_remote(SESSION *);
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char *session_getUser(SESSION *);
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void printAllSessions();
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void printSession(SESSION *);
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void dprintSessionList(DCB *pdcb);
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void dprintAllSessions(struct dcb *);
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void dprintSession(struct dcb *, SESSION *);
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void dListSessions(struct dcb *);
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char *session_state(session_state_t);
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bool session_link_dcb(SESSION *, struct dcb *);
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SESSION* get_session_by_router_ses(void* rses);
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void session_enable_log_priority(SESSION* ses, int priority);
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void session_disable_log_priority(SESSION* ses, int priority);
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RESULTSET *sessionGetList(SESSIONLISTFILTER);
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void process_idle_sessions();
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void enable_session_timeouts();
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MXS_END_DECLS
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#endif
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