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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 Affero 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.
-
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @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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