plugin_block_consensus.c

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/*
     This file is part of GNUnet
     Copyright (C) 2017, 2021 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
 */
 
#include "platform.h"
#include "consensus_protocol.h"
#include "gnunet_block_plugin.h"
#include "gnunet_block_group_lib.h"
 
 
struct BlockContext
{
  const struct GNUNET_CONFIGURATION_Handle *cfg;
 
  struct GNUNET_BLOCK_Context *bc;
};
 
 
 
static enum GNUNET_GenericReturnValue
block_plugin_consensus_check_query (void *cls,
                                    enum GNUNET_BLOCK_Type type,
                                    const struct GNUNET_HashCode *query,
                                    const void *xquery,
                                    size_t xquery_size)
{
  /* consensus does not use queries/DHT */
  GNUNET_break (0);
  return GNUNET_SYSERR;
}
 
 
static enum GNUNET_GenericReturnValue
block_plugin_consensus_check_block (void *cls,
                                    enum GNUNET_BLOCK_Type type,
                                    const void *block,
                                    size_t block_size)
{
  struct BlockContext *ctx = cls;
  const struct ConsensusElement *ce = block;
 
  if (block_size < sizeof(*ce))
  {
    GNUNET_break_op (0);
    return GNUNET_NO;
  }
  if ( (0 != ce->marker) ||
       (0 == ce->payload_type) )
    return GNUNET_OK;
  if (NULL == ctx->bc)
    ctx->bc = GNUNET_BLOCK_context_create (ctx->cfg);
  return GNUNET_BLOCK_check_block (ctx->bc,
                                   ntohl (ce->payload_type),
                                   &ce[1],
                                   block_size - sizeof(*ce));
}
 
 
static enum GNUNET_BLOCK_ReplyEvaluationResult
block_plugin_consensus_check_reply (
  void *cls,
  enum GNUNET_BLOCK_Type type,
  struct GNUNET_BLOCK_Group *group,
  const struct GNUNET_HashCode *query,
  const void *xquery,
  size_t xquery_size,
  const void *reply_block,
  size_t reply_block_size)
{
  struct BlockContext *ctx = cls;
  const struct ConsensusElement *ce = reply_block;
 
  GNUNET_assert (reply_block_size >= sizeof(struct ConsensusElement));
  if ( (0 != ce->marker) ||
       (0 == ce->payload_type) )
    return GNUNET_BLOCK_REPLY_OK_MORE;
  if (NULL == ctx->bc)
    ctx->bc = GNUNET_BLOCK_context_create (ctx->cfg);
  return GNUNET_BLOCK_check_reply (ctx->bc,
                                   ntohl (ce->payload_type),
                                   group,
                                   query,
                                   xquery,
                                   xquery_size,
                                   &ce[1],
                                   reply_block_size - sizeof(*ce));
}
 
 
static enum GNUNET_GenericReturnValue
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;
}
 
 
void *
libgnunet_plugin_block_consensus_init (void *cls)
{
  static const enum GNUNET_BLOCK_Type types[] = {
    GNUNET_BLOCK_TYPE_CONSENSUS_ELEMENT,
    GNUNET_BLOCK_TYPE_ANY       /* end of list */
  };
  const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
  struct BlockContext *ctx;
  struct GNUNET_BLOCK_PluginFunctions *api;
 
  ctx = GNUNET_new (struct BlockContext);
  ctx->cfg = cfg;
  api = GNUNET_new (struct GNUNET_BLOCK_PluginFunctions);
  api->cls = ctx;
  api->get_key = &block_plugin_consensus_get_key;
  api->check_query = &block_plugin_consensus_check_query;
  api->check_block = &block_plugin_consensus_check_block;
  api->check_reply = &block_plugin_consensus_check_reply;
  api->types = types;
  return api;
}
 
 
void *
libgnunet_plugin_block_consensus_done (void *cls)
{
  struct GNUNET_BLOCK_PluginFunctions *api = cls;
  struct BlockContext *ctx = api->cls;
 
  if (NULL != ctx->bc)
    GNUNET_BLOCK_context_destroy (ctx->bc);
  GNUNET_free (ctx);
  GNUNET_free (api);
  return NULL;
}
 
 
/* end of plugin_block_consensus.c */