6d2b38d4b6
RWSplit router handles query processing errors that happened in router by sending parse error reply to client. routeQuery fails only when backend has failed.
111 lines
3.7 KiB
C
111 lines
3.7 KiB
C
#ifndef _ROUTER_H
|
|
#define _ROUTER_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 router.h - The query router interface mechanisms
|
|
*
|
|
* Revision History
|
|
*
|
|
* Date Who Description
|
|
* 14/06/2013 Mark Riddoch Initial implementation
|
|
* 26/06/2013 Mark Riddoch Addition of router options
|
|
* and the diagnostic entry point
|
|
* 15/07/2013 Massimiliano Pinto Added clientReply entry point
|
|
* 16/07/2013 Massimiliano Pinto Added router commands values
|
|
* 22/10/2013 Massimiliano Pinto Added router errorReply entry point
|
|
*
|
|
*/
|
|
#include <service.h>
|
|
#include <session.h>
|
|
#include <buffer.h>
|
|
#include <stdint.h>
|
|
|
|
/**
|
|
* The ROUTER handle points to module specific data, so the best we can do
|
|
* is to make it a void * externally.
|
|
*/
|
|
typedef void *ROUTER;
|
|
|
|
typedef enum error_action {
|
|
ERRACT_NEW_CONNECTION = 0x001,
|
|
ERRACT_REPLY_CLIENT = 0x002,
|
|
ERRACT_RESET = 0x004
|
|
} error_action_t;
|
|
|
|
/**
|
|
* @verbatim
|
|
* The "module object" structure for a query router module
|
|
*
|
|
* The entry points are:
|
|
* createInstance Called by the service to create a new
|
|
* instance of the query router
|
|
* newSession Called to create a new user session
|
|
* within the query router
|
|
* closeSession Called when a session is closed
|
|
* routeQuery Called on each query that requires
|
|
* routing
|
|
* diagnostics Called to force the router to print
|
|
* diagnostic output
|
|
* clientReply Called to reply to client the data from one or all backends
|
|
* errorReply Called to reply to client errors with optional closeSession or
|
|
* make a request for a new backend connection
|
|
*
|
|
* @endverbatim
|
|
*
|
|
* @see load_module
|
|
*/
|
|
typedef struct router_object {
|
|
ROUTER *(*createInstance)(SERVICE *service, char **options);
|
|
void *(*newSession)(ROUTER *instance, SESSION *session);
|
|
void (*closeSession)(ROUTER *instance, void *router_session);
|
|
void (*freeSession)(ROUTER *instance, void *router_session);
|
|
int (*routeQuery)(ROUTER *instance, void *router_session, GWBUF *queue);
|
|
void (*diagnostics)(ROUTER *instance, DCB *dcb);
|
|
void (*clientReply)(ROUTER* instance, void* router_session, GWBUF* queue, DCB *backend_dcb);
|
|
void (*handleError)(
|
|
ROUTER* instance,
|
|
void* router_session,
|
|
GWBUF* errmsgbuf,
|
|
DCB* backend_dcb,
|
|
error_action_t action,
|
|
bool* succp);
|
|
uint8_t (*getCapabilities)(ROUTER *instance, void* router_session);
|
|
} ROUTER_OBJECT;
|
|
|
|
/**
|
|
* The router module API version. Any change that changes the router API
|
|
* must update these versions numbers in accordance with the rules in
|
|
* modinfo.h.
|
|
*/
|
|
#define ROUTER_VERSION { 1, 0, 0 }
|
|
|
|
/**
|
|
* Router capability type. Indicates what kind of input router accepts.
|
|
*/
|
|
typedef enum router_capability_t {
|
|
RCAP_TYPE_UNDEFINED = 0x00,
|
|
RCAP_TYPE_STMT_INPUT = 0x01, /*< statement per buffer */
|
|
RCAP_TYPE_PACKET_INPUT = 0x02 /*< data as it was read from DCB */
|
|
} router_capability_t;
|
|
|
|
|
|
|
|
#endif
|