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/*
This file is part of GNUnet
(C) 2010 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file include/gnunet_block_plugin.h
* @brief API for block plugins. Each block plugin must conform to
* the API specified by this header.
* @author Christian Grothoff
*/
#ifndef PLUGIN_BLOCK_H
#define PLUGIN_BLOCK_H
#include "gnunet_util_lib.h"
#include "gnunet_container_lib.h"
#include "gnunet_block_lib.h"
/**
* Function called to validate a reply or a request. For
* request evaluation, simply pass "NULL" for the reply_block.
* Note that it is assumed that the reply has already been
* matched to the key (and signatures checked) as it would
* be done with the "get_key" function.
*
* @param cls closure
* @param type block type
* @param query original query (hash)
* @param bf pointer to bloom filter associated with query; possibly updated (!)
* @param bf_mutator mutation value for bf
* @param xquery extrended query data (can be NULL, depending on type)
* @param xquery_size number of bytes in xquery
* @param reply_block response to validate
* @param reply_block_size number of bytes in reply block
* @return characterization of result
*/
typedef enum
GNUNET_BLOCK_EvaluationResult (*GNUNET_BLOCK_EvaluationFunction) (void *cls,
enum
GNUNET_BLOCK_Type
type,
const
GNUNET_HashCode
* query,
struct
GNUNET_CONTAINER_BloomFilter
** bf,
int32_t
bf_mutator,
const void
*xquery,
size_t
xquery_size,
const void
*reply_block,
size_t
reply_block_size);
/**
* Function called to obtain the key for a block.
*
* @param cls closure
* @param type block type
* @param block block to get the key for
* @param block_size number of bytes in block
* @param key set to the key (query) for the given block
* @return GNUNET_YES on success,
* GNUNET_NO if the block is malformed
* GNUNET_SYSERR if type not supported
* (or if extracting a key from a block of this type does not work)
*/
typedef int (*GNUNET_BLOCK_GetKeyFunction) (void *cls,
enum GNUNET_BLOCK_Type type,
const void *block,
size_t block_size,
GNUNET_HashCode * key);
/**
* Each plugin is required to return a pointer to a struct of this
* type as the return value from its entry point.
*/
struct GNUNET_BLOCK_PluginFunctions
{
/**
* Closure for all of the callbacks.
*/
void *cls;
/**
* 0-terminated array of block types supported by this plugin.
*/
const enum GNUNET_BLOCK_Type *types;
/**
* Main function of a block plugin. Allows us to check if a
* block matches a query.
*/
GNUNET_BLOCK_EvaluationFunction evaluate;
/**
* Obtain the key for a given block (if possible).
*/
GNUNET_BLOCK_GetKeyFunction get_key;
};
#endif
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