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/*
This file is part of GNUnet
Copyright (C) 2017 GNUnet e.V.
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 of the License,
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
Affero General Public License for more details.
*/
/**
* @file consensus/plugin_block_consensus.c
* @brief consensus block, either nested block or marker
* @author Christian Grothoff
*/
#include "platform.h"
#include "consensus_protocol.h"
#include "gnunet_block_plugin.h"
#include "gnunet_block_group_lib.h"
/**
* Function called to validate a reply or a request. For
* request evaluation, simply pass "NULL" for the reply_block.
*
* @param cls closure
* @param ctx context
* @param type block type
* @param group block group to use
* @param eo control flags
* @param query original query (hash)
* @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
*/
static enum GNUNET_BLOCK_EvaluationResult
block_plugin_consensus_evaluate (void *cls,
struct GNUNET_BLOCK_Context *ctx,
enum GNUNET_BLOCK_Type type,
struct GNUNET_BLOCK_Group *group,
enum GNUNET_BLOCK_EvaluationOptions eo,
const struct GNUNET_HashCode *query,
const void *xquery,
size_t xquery_size,
const void *reply_block,
size_t reply_block_size)
{
if (reply_block_size < sizeof (struct ConsensusElement))
return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
const struct ConsensusElement *ce = reply_block;
if ( (0 != ce->marker) ||
(0 == ce->payload_type ) )
return GNUNET_BLOCK_EVALUATION_OK_MORE;
return GNUNET_BLOCK_evaluate (ctx,
type,
group,
eo,
query,
xquery,
xquery_size,
&ce[1],
reply_block_size - sizeof (struct ConsensusElement));
}
/**
* 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_OK on success, #GNUNET_SYSERR if type not supported
* (or if extracting a key from a block of this type does not work)
*/
static int
block_plugin_consensus_get_key (void *cls,
enum GNUNET_BLOCK_Type type,
const void *block,
size_t block_size,
struct GNUNET_HashCode *key)
{
return GNUNET_SYSERR;
}
/**
* Entry point for the plugin.
*/
void *
libgnunet_plugin_block_consensus_init (void *cls)
{
static enum GNUNET_BLOCK_Type types[] =
{
GNUNET_BLOCK_TYPE_CONSENSUS_ELEMENT,
GNUNET_BLOCK_TYPE_ANY /* end of list */
};
struct GNUNET_BLOCK_PluginFunctions *api;
api = GNUNET_new (struct GNUNET_BLOCK_PluginFunctions);
api->evaluate = &block_plugin_consensus_evaluate;
api->get_key = &block_plugin_consensus_get_key;
api->types = types;
return api;
}
/**
* Exit point from the plugin.
*/
void *
libgnunet_plugin_block_consensus_done (void *cls)
{
struct GNUNET_BLOCK_PluginFunctions *api = cls;
GNUNET_free (api);
return NULL;
}
/* end of plugin_block_consensus.c */
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