111 lines
3.8 KiB
C
111 lines
3.8 KiB
C
#pragma once
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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 router.h - The query router interface mechanisms
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*
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* Revision History
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*
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* Date Who Description
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* 14/06/2013 Mark Riddoch Initial implementation
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* 26/06/2013 Mark Riddoch Addition of router options and the diagnostic entry point
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* 15/07/2013 Massimiliano Pinto Added clientReply entry point
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* 16/07/2013 Massimiliano Pinto Added router commands values
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* 22/10/2013 Massimiliano Pinto Added router errorReply entry point
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* 27/10/2015 Martin Brampton Add RCAP_TYPE_NO_RSESSION
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*
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*/
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#include <maxscale/cdefs.h>
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#include <maxscale/routing.h>
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#include <maxscale/service.h>
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#include <maxscale/session.h>
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#include <maxscale/buffer.h>
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#include <stdint.h>
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MXS_BEGIN_DECLS
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/**
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* The ROUTER handle points to module specific data, so the best we can do
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* is to make it a void * externally.
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*/
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typedef void *ROUTER;
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typedef enum error_action
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{
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ERRACT_NEW_CONNECTION = 0x001,
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ERRACT_REPLY_CLIENT = 0x002
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} error_action_t;
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/**
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* @verbatim
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* The "module object" structure for a query router module
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*
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* The entry points are:
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* createInstance Called by the service to create a new instance of the query router
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* newSession Called to create a new user session within the query router
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* closeSession Called when a session is closed
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* routeQuery Called on each query that requires routing
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* diagnostics Called to force the router to print diagnostic output
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* clientReply Called to reply to client the data from one or all backends
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* errorReply Called to reply to client errors with optional closeSession or make a request for
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* a new backend connection
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*
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* @endverbatim
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*
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* @see load_module
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*/
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typedef struct router_object
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{
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ROUTER *(*createInstance)(SERVICE *service, char **options);
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void *(*newSession)(ROUTER *instance, SESSION *session);
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void (*closeSession)(ROUTER *instance, void *router_session);
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void (*freeSession)(ROUTER *instance, void *router_session);
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int (*routeQuery)(ROUTER *instance, void *router_session, GWBUF *queue);
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void (*diagnostics)(ROUTER *instance, DCB *dcb);
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void (*clientReply)(ROUTER* instance, void* router_session, GWBUF* queue, DCB *backend_dcb);
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void (*handleError)(ROUTER* instance,
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void* router_session,
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GWBUF* errmsgbuf,
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DCB* backend_dcb,
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error_action_t action,
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bool* succp);
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uint64_t (*getCapabilities)(void);
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} ROUTER_OBJECT;
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/**
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* The router module API version. Any change that changes the router API
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* must update these versions numbers in accordance with the rules in
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* modinfo.h.
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*/
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#define ROUTER_VERSION { 2, 0, 0 }
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/**
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* Specifies capabilities specific for routers. Common capabilities
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* are defined by @c routing_capability_t.
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*
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* @see routing_capability_t
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*
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* @note The values of the capabilities here *must* be between 0x00010000
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* and 0x80000000, that is, bits 16 to 31.
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*/
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typedef enum router_capability
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{
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RCAP_TYPE_NO_RSESSION = 0x00010000, /**< Router does not use router sessions */
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RCAP_TYPE_NO_USERS_INIT = 0x00020000, /**< Prevent the loading of authenticator
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users when the service is started */
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} router_capability_t;
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MXS_END_DECLS
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