d77a9a3040
Up until 2.1.12, if it in the configuration file said 'router_options=slave', the master was used if there were no slaves at session creation time. That broke in 2.1.13 as a side-effect of MXS-1516 that checks at routing time whether the server initially selected as master still is the master. Now the required server status is stored separately for each session, so that if the master was chosen, even though we have 'router_options=slave', we can turn on the SERVER_MASTER bit. That allows us to handle the case correctly in connection_is_valid().
85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
#pragma once
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#ifndef _READCONNECTION_H
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#define _READCONNECTION_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/bsl11.
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*
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* Change Date: 2020-01-01
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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 readconnection.h - The read connection balancing query module heder file
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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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* 14/06/13 Mark Riddoch Initial implementation
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* 27/06/14 Mark Riddoch Addition of server weight percentage
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*
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* @endverbatim
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*/
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#define MXS_MODULE_NAME "readconnroute"
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#include <maxscale/cdefs.h>
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#include <maxscale/dcb.h>
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#include <maxscale/service.h>
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MXS_BEGIN_DECLS
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/**
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* The client session structure used within this router.
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*/
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typedef struct router_client_session
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{
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#if defined(SS_DEBUG)
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skygw_chk_t rses_chk_top;
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#endif
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SPINLOCK rses_lock; /*< protects rses_deleted */
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int rses_versno; /*< even = no active update, else odd */
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bool rses_closed; /*< true when closeSession is called */
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SERVER_REF *backend; /*< Backend used by the client session */
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DCB *backend_dcb; /*< DCB Connection to the backend */
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DCB *client_dcb; /**< Client DCB */
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unsigned int bitvalue; /*< Session specific required value of server->status */
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struct router_client_session *next;
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#if defined(SS_DEBUG)
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skygw_chk_t rses_chk_tail;
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#endif
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} ROUTER_CLIENT_SES;
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/**
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* The statistics for this router instance
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*/
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typedef struct
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{
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int n_sessions; /*< Number sessions created */
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int n_queries; /*< Number of queries forwarded */
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} ROUTER_STATS;
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/**
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* The per instance data for the router.
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*/
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typedef struct router_instance
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{
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SERVICE *service; /*< Pointer to the service using this router */
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SPINLOCK lock; /*< Spinlock for the instance data */
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unsigned int bitmask; /*< Bitmask to apply to server->status */
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unsigned int bitvalue; /*< Required value of server->status */
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ROUTER_STATS stats; /*< Statistics for this router */
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struct router_instance
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*next;
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} ROUTER_INSTANCE;
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MXS_END_DECLS
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#endif
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