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- /*
- This file is part of GNUnet
- Copyright (C) 2010,2013 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., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA.
- */
- /**
- * @author Christian Grothoff
- *
- * @file
- * API for block plugins.
- *
- * @defgroup block-plugin Block plugin API
- * To be implemented by applications storing data in the DHT.
- *
- * Each block plugin must conform to the API specified by this header.
- *
- * @{
- */
- #ifndef PLUGIN_BLOCK_H
- #define PLUGIN_BLOCK_H
- #include "gnunet_util_lib.h"
- #include "gnunet_block_lib.h"
- /**
- * Function called to validate a reply or a request. For
- * request evaluation, simply pass "NULL" for the @a 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 eo evaluation options to control evaluation
- * @param query original query (hash)
- * @param bf pointer to bloom filter associated with query; possibly updated (!)
- * @param bf_mutator mutation value for @a bf
- * @param xquery extrended query data (can be NULL, depending on type)
- * @param xquery_size number of bytes in @a xquery
- * @param reply_block response to validate
- * @param reply_block_size number of bytes in @a reply_block
- * @return characterization of result
- */
- typedef enum GNUNET_BLOCK_EvaluationResult
- (*GNUNET_BLOCK_EvaluationFunction) (void *cls,
- enum GNUNET_BLOCK_Type type,
- enum GNUNET_BLOCK_EvaluationOptions eo,
- const struct 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 @a 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,
- struct 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
- /** @} */ /* end of group */
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