2 This file is part of GNUnet
3 (C) 2010,2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file include/gnunet_block_plugin.h
23 * @brief API for block plugins. Each block plugin must conform to
24 * the API specified by this header.
25 * @author Christian Grothoff
26 * @defgroup block API to be implemented by applications storing data in the DHT
29 #ifndef PLUGIN_BLOCK_H
30 #define PLUGIN_BLOCK_H
32 #include "gnunet_util_lib.h"
33 #include "gnunet_block_lib.h"
37 * Function called to validate a reply or a request. For
38 * request evaluation, simply pass "NULL" for the @a reply_block.
39 * Note that it is assumed that the reply has already been
40 * matched to the key (and signatures checked) as it would
41 * be done with the "get_key" function.
44 * @param type block type
45 * @param query original query (hash)
46 * @param bf pointer to bloom filter associated with query; possibly updated (!)
47 * @param bf_mutator mutation value for @a bf
48 * @param xquery extrended query data (can be NULL, depending on type)
49 * @param xquery_size number of bytes in @a xquery
50 * @param reply_block response to validate
51 * @param reply_block_size number of bytes in @a reply_block
52 * @return characterization of result
54 typedef enum GNUNET_BLOCK_EvaluationResult
55 (*GNUNET_BLOCK_EvaluationFunction) (void *cls,
56 enum GNUNET_BLOCK_Type type,
57 const struct GNUNET_HashCode *query,
58 struct GNUNET_CONTAINER_BloomFilter **bf,
62 const void *reply_block,
63 size_t reply_block_size);
67 * Function called to obtain the key for a block.
70 * @param type block type
71 * @param block block to get the key for
72 * @param block_size number of bytes in @a block
73 * @param key set to the key (query) for the given block
74 * @return #GNUNET_YES on success,
75 * #GNUNET_NO if the block is malformed
76 * #GNUNET_SYSERR if type not supported
77 * (or if extracting a key from a block of this type does not work)
79 typedef int (*GNUNET_BLOCK_GetKeyFunction) (void *cls,
80 enum GNUNET_BLOCK_Type type,
83 struct GNUNET_HashCode * key);
88 * Each plugin is required to return a pointer to a struct of this
89 * type as the return value from its entry point.
91 struct GNUNET_BLOCK_PluginFunctions
95 * Closure for all of the callbacks.
100 * 0-terminated array of block types supported by this plugin.
102 const enum GNUNET_BLOCK_Type *types;
105 * Main function of a block plugin. Allows us to check if a
106 * block matches a query.
108 GNUNET_BLOCK_EvaluationFunction evaluate;
111 * Obtain the key for a given block (if possible).
113 GNUNET_BLOCK_GetKeyFunction get_key;
117 /** @} */ /* end of group block */