e41589be10
- Headers now to be included as <maxscale/xyz.h> - First step, no cleanup of headers has been made. Only moving from one place to another + necessary modifications.
116 lines
2.5 KiB
C
116 lines
2.5 KiB
C
#ifndef _MYSQLHINT_H
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#define _MYSQLHINT_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/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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* Revision History
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*
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* Date Who Description
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* 17-07-2014 Mark Riddoch Initial implementation
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*/
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#include <maxscale/hint.h>
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/* Parser tokens for the hint parser */
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typedef enum
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{
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TOK_MAXSCALE = 1,
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TOK_PREPARE,
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TOK_START,
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TOK_STOP,
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TOK_EQUAL,
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TOK_STRING,
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TOK_ROUTE,
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TOK_TO,
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TOK_MASTER,
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TOK_SLAVE,
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TOK_SERVER,
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TOK_EOL
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} TOKEN_VALUE;
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/* The tokenising return type */
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typedef struct
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{
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TOKEN_VALUE token; // The token itself
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char *value; // The string version of the token
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} HINT_TOKEN;
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/**
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* A named hint set.
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*
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* The hint "MaxScale name PREPARE ..." can be used to defined a named set
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* of hints that can be later applied.
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*/
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typedef struct namedhints
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{
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char *name; /*< Hintsets name */
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HINT *hints;
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struct namedhints
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*next; /*< Next named hint */
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} NAMEDHINTS;
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/**
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* A session meaintains a stack of hints, the hints BEGIN and STOP are used
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* push hints on and off the stack. The current top of the stack is added to
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* any statement that does not explicitly define a hint for that signle
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* statement.
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*/
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typedef struct hintstack
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{
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HINT *hint;
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struct hintstack
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*next;
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} HINTSTACK;
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/**
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* The hint instance structure
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*/
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typedef struct
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{
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int sessions;
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} HINT_INSTANCE;
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/**
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* A hint parser session structure
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*/
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typedef struct
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{
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DOWNSTREAM down;
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GWBUF *request;
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int query_len;
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HINTSTACK *stack;
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NAMEDHINTS *named_hints; /* The named hints defined in this session */
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} HINT_SESSION;
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/* Some useful macros */
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#define CURRENT_HINT(session) ((session)->stack ? \
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(session)->stack->hints : NULL)
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/* Hint Parser State Machine */
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#define HS_INIT 0
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#define HS_ROUTE 1
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#define HS_ROUTE1 2
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#define HS_ROUTE_SERVER 3
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#define HS_NAME 4
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#define HS_PVALUE 5
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#define HS_PREPARE 6
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extern HINT *hint_parser(HINT_SESSION *session, GWBUF *request);
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NAMEDHINTS* free_named_hint(NAMEDHINTS* named_hint);
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HINTSTACK* free_hint_stack(HINTSTACK* hint_stack);
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#endif
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