141 lines
4.6 KiB
C
141 lines
4.6 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 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 <maxscale/cdefs.h>
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#include <maxscale/routing.h>
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#include <maxscale/dcb.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 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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{
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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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* clientReply Called for each reply packet
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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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{
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FILTER *(*createInstance)(const char *name,
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char **options,
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FILTER_PARAMETER **params);
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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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void (*setUpstream)(FILTER *instance, void *fsession, UPSTREAM *downstream);
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int (*routeQuery)(FILTER *instance, void *fsession, GWBUF *queue);
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int (*clientReply)(FILTER *instance, void *fsession, GWBUF *queue);
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void (*diagnostics)(FILTER *instance, void *fsession, DCB *dcb);
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uint64_t (*getCapabilities)(void);
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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 {2, 2, 0}
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/**
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* The definition of a filter from 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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{
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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 **parameters; /**< The filter parameters */
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FILTER filter; /**< The runtime filter */
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FILTER_OBJECT *obj; /**< The "MODULE_OBJECT" for the filter */
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SPINLOCK spin; /**< Spinlock to protect the filter definition */
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struct filter_def *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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bool filter_load(FILTER_DEF* filter);
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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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UPSTREAM *filterUpstream(FILTER_DEF *, void *, UPSTREAM *);
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int filter_standard_parameter(char *);
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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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/**
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* Specifies capabilities specific for filters. 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 0x000100000000
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* and 0x800000000000, that is, bits 32 to 47.
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*/
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/*
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typedef enum filter_capability
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{
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} filter_capability_t;
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*/
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MXS_END_DECLS
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