146 lines
3.5 KiB
C
146 lines
3.5 KiB
C
#pragma once
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#ifndef _MAXINFO_H
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#define _MAXINFO_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 maxinfo.h The MaxScale information schema provider
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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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* 16/02/15 Mark Riddoch Initial implementation
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*
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* @endverbatim
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*/
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#define MXS_MODULE_NAME "maxinfo"
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#include <maxscale/cdefs.h>
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#include <maxscale/service.h>
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#include <maxscale/session.h>
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#include <maxscale/spinlock.h>
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MXS_BEGIN_DECLS
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struct maxinfo_session;
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/**
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* The INFO_INSTANCE structure. There is one instane of the maxinfo "router" for
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* each service that uses the MaxScale information schema.
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*/
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typedef struct maxinfo_instance
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{
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SPINLOCK lock; /*< The instance spinlock */
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SERVICE *service; /*< The debug cli service */
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struct maxinfo_session
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*sessions; /*< Linked list of sessions within this instance */
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struct maxinfo_instance
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*next; /*< The next pointer for the list of instances */
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} INFO_INSTANCE;
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/**
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* The INFO_SESSION structure. As INFO_SESSION is created for each user that logs into
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* the MaxScale information schema.
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*/
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typedef struct maxinfo_session
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{
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MXS_SESSION *session; /*< The MaxScale session */
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DCB *dcb; /*< DCB of the client side */
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GWBUF *queue; /*< Queue for building contiguous requests */
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struct maxinfo_session
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*next; /*< The next pointer for the list of sessions */
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} INFO_SESSION;
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/**
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* The operators that can be in the parse tree
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*/
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typedef enum
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{
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MAXOP_SHOW,
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MAXOP_SELECT,
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MAXOP_TABLE,
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MAXOP_COLUMNS,
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MAXOP_ALL_COLUMNS,
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MAXOP_LITERAL,
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MAXOP_PREDICATE,
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MAXOP_LIKE,
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MAXOP_EQUAL,
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MAXOP_FLUSH,
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MAXOP_SET,
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MAXOP_CLEAR,
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MAXOP_SHUTDOWN,
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MAXOP_RESTART
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} MAXINFO_OPERATOR;
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/**
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* The Parse tree nodes for the MaxInfo parser
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*/
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typedef struct maxinfo_tree
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{
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MAXINFO_OPERATOR op; /*< The operator */
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char *value; /*< The value */
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struct maxinfo_tree *left; /*< The left hand side of the operator */
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struct maxinfo_tree *right; /*< The right hand side of the operator */
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} MAXINFO_TREE;
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#define MYSQL_COMMAND(buf) (*((uint8_t *)GWBUF_DATA(buf) + 4))
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/**
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* Token values for the tokeniser used by the parser for maxinfo
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*/
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#define LT_STRING 1
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#define LT_SHOW 2
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#define LT_LIKE 3
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#define LT_SELECT 4
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#define LT_EQUAL 5
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#define LT_COMMA 6
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#define LT_FROM 7
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#define LT_STAR 8
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#define LT_VARIABLE 9
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#define LT_FLUSH 10
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#define LT_SET 11
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#define LT_CLEAR 12
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#define LT_SHUTDOWN 13
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#define LT_RESTART 14
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/**
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* Possible parse errors
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*/
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typedef enum
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{
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PARSE_NOERROR,
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PARSE_MALFORMED_SHOW,
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PARSE_EXPECTED_LIKE,
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PARSE_SYNTAX_ERROR
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} PARSE_ERROR;
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extern MAXINFO_TREE *maxinfo_parse(char *, PARSE_ERROR *);
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extern void maxinfo_free_tree(MAXINFO_TREE *);
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extern void maxinfo_execute(DCB *, MAXINFO_TREE *);
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extern void maxinfo_send_error(DCB *, int, const char *);
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extern void maxinfo_send_parse_error(DCB *, char *, PARSE_ERROR);
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extern RESULTSET *maxinfo_variables();
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extern RESULTSET *maxinfo_status();
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MXS_END_DECLS
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#endif
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