115 lines
3.6 KiB
C
115 lines
3.6 KiB
C
#ifndef _FILTER_H
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#define _FILTER_H
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/*
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* This file is distributed as part of the SkySQL Gateway. It is free
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* software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation,
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* version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright SkySQL Ab 2014
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*/
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/**
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* @file filter.h - The filter 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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* 27/05/2014 Mark Riddoch Initial implementation
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*
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*/
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#include <dcb.h>
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#include <session.h>
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#include <buffer.h>
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#include <stdint.h>
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/**
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* The FILTER 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 *FILTER;
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/**
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* The structure used to pass name, value pairs to the filter instances
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*/
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typedef struct {
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char *name; /**< Name of the parameter */
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char *value; /**< Value of the parameter */
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} FILTER_PARAMETER;
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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
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* instance of the filter
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* newSession Called to create a new user session
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* within the filter
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* closeSession Called when a session is closed
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* freeSession Called when a session is freed
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* setDownstream Sets the downstream component of the
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* filter pipline
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* routeQuery Called on each query that requires
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* routing
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* diagnostics Called to force the filter to print
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* diagnostic output
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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 filter_object {
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FILTER *(*createInstance)(char **options, FILTER_PARAMETER **);
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void *(*newSession)(FILTER *instance, SESSION *session);
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void (*closeSession)(FILTER *instance, void *fsession);
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void (*freeSession)(FILTER *instance, void *fsession);
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void (*setDownstream)(FILTER *instance, void *fsession, DOWNSTREAM *downstream);
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int (*routeQuery)(FILTER *instance, void *fsession, GWBUF *queue);
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void (*diagnostics)(FILTER *instance, void *fsession, DCB *dcb);
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} FILTER_OBJECT;
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/**
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* The filter API version. If the FILTER_OBJECT structure or the filter API
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* is changed these values must be updated in line with the rules in the
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* file modinfo.h.
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*/
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#define FILTER_VERSION {1, 0, 0}
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/**
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* The definition of a filter form the configuration file.
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* This is basically the link between a plugin to load and the
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* optons to pass to that plugin.
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*/
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typedef struct filter_def {
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char *name; /*< The Filter name */
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char *module; /*< The module to load */
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char **options; /*< The options set for this filter */
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FILTER_PARAMETER
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**parameters; /*< The filter parameters */
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FILTER filter;
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FILTER_OBJECT *obj;
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SPINLOCK spin;
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struct filter_def
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*next; /*< Next filter in the chain of all filters */
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} FILTER_DEF;
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FILTER_DEF *filter_alloc(char *, char *);
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void filter_free(FILTER_DEF *);
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FILTER_DEF *filter_find(char *);
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void filterAddOption(FILTER_DEF *, char *);
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void filterAddParameter(FILTER_DEF *, char *, char *);
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DOWNSTREAM *filterApply(FILTER_DEF *, SESSION *, DOWNSTREAM *);
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void dprintAllFilters(DCB *);
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void dprintFilter(DCB *, FILTER_DEF *);
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void dListFilters(DCB *);
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#endif
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