163 lines
5.0 KiB
C
163 lines
5.0 KiB
C
#ifndef _SESSION_H
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#define _SESSION_H
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/*
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* This file is distributed as part of the SkySQL Gateway. It is free
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* software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation,
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* version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright SkySQL Ab 2013
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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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*
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* @endverbatim
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*/
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#include <time.h>
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#include <atomic.h>
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#include <buffer.h>
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#include <spinlock.h>
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#include <skygw_utils.h>
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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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time_t connect; /**< Time when the session was started */
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} SESSION_STATS;
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typedef enum {
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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_FREE /*< for all sessions */
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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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void *instance;
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void *session;
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int (*routeQuery)(void *instance, void *session,
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GWBUF *request);
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} DOWNSTREAM;
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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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void *instance;
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void *session;
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int (*clientReply)(void *instance,
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void *session, GWBUF *response);
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int (*error)(void *instance, void *session, void *);
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} UPSTREAM;
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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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struct filter_def
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*filter;
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void *instance;
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void *session;
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} SESSION_FILTER;
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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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typedef struct session {
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#if defined(SS_DEBUG)
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skygw_chk_t ses_chk_top;
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#endif
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SPINLOCK ses_lock;
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session_state_t state; /**< Current descriptor state */
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struct dcb *client; /**< The client connection */
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void *data; /**< The session data */
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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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struct session *next; /**< Linked list of all sessions */
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int refcount; /**< Reference count on the session */
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#if defined(SS_DEBUG)
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skygw_chk_t ses_chk_tail;
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#endif
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} SESSION;
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#define SESSION_PROTOCOL(x, type) DCB_PROTOCOL((x)->client, 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_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 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(int);
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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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#endif
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