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22 * @file block/plugin_block_template.c
23 * @brief template for a block plugin
24 * @author Christian Grothoff
28 #include "gnunet_block_plugin.h"
29 #include "gnunet_block_group_lib.h"
31 #define DEBUG_TEMPLATE GNUNET_EXTRA_LOGGING
34 * Number of bits we set per entry in the bloomfilter.
37 #define BLOOMFILTER_K 16
41 * How big is the BF we use for DHT blocks?
43 #define TEMPLATE_BF_SIZE 8
47 * Create a new block group.
49 * @param ctx block context in which the block group is created
50 * @param type type of the block for which we are creating the group
51 * @param nonce random value used to seed the group creation
52 * @param raw_data optional serialized prior state of the group, NULL if unavailable/fresh
53 * @param raw_data_size number of bytes in @a raw_data, 0 if unavailable/fresh
54 * @param va variable arguments specific to @a type
55 * @return block group handle, NULL if block groups are not supported
56 * by this @a type of block (this is not an error)
58 static struct GNUNET_BLOCK_Group *
59 block_plugin_template_create_group (void *cls,
60 enum GNUNET_BLOCK_Type type,
66 return GNUNET_BLOCK_GROUP_bf_create (cls,
77 * Function called to validate a reply or a request. For
78 * request evaluation, simply pass "NULL" for the reply_block.
81 * @param type block type
82 * @param group block group to use
83 * @param eo control flags
84 * @param query original query (hash)
85 * @param xquery extrended query data (can be NULL, depending on type)
86 * @param xquery_size number of bytes in xquery
87 * @param reply_block response to validate
88 * @param reply_block_size number of bytes in reply block
89 * @return characterization of result
91 static enum GNUNET_BLOCK_EvaluationResult
92 block_plugin_template_evaluate (void *cls,
93 enum GNUNET_BLOCK_Type type,
94 struct GNUNET_BLOCK_Group *group,
95 enum GNUNET_BLOCK_EvaluationOptions eo,
96 const struct GNUNET_HashCode *query,
99 const void *reply_block,
100 size_t reply_block_size)
102 struct GNUNET_HashCode chash;
104 if (NULL == reply_block)
105 return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
106 GNUNET_CRYPTO_hash (reply_block,
110 GNUNET_BLOCK_GROUP_bf_test_and_set (group,
112 return GNUNET_BLOCK_EVALUATION_OK_DUPLICATE;
113 return GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED;
118 * Function called to obtain the key for a block.
121 * @param type block type
122 * @param block block to get the key for
123 * @param block_size number of bytes in block
124 * @param key set to the key (query) for the given block
125 * @return #GNUNET_OK on success, #GNUNET_SYSERR if type not supported
126 * (or if extracting a key from a block of this type does not work)
129 block_plugin_template_get_key (void *cls,
130 enum GNUNET_BLOCK_Type type,
133 struct GNUNET_HashCode *key)
135 return GNUNET_SYSERR;
140 * Entry point for the plugin.
143 libgnunet_plugin_block_template_init (void *cls)
145 static enum GNUNET_BLOCK_Type types[] =
147 /* FIXME: insert supported block types here */
148 GNUNET_BLOCK_TYPE_ANY /* end of list */
150 struct GNUNET_BLOCK_PluginFunctions *api;
152 api = GNUNET_new (struct GNUNET_BLOCK_PluginFunctions);
153 api->evaluate = &block_plugin_template_evaluate;
154 api->get_key = &block_plugin_template_get_key;
155 api->create_group = &block_plugin_template_create_group;
162 * Exit point from the plugin.
165 libgnunet_plugin_block_template_done (void *cls)
167 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
173 /* end of plugin_block_template.c */