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/*
This file is part of GNUnet.
Copyright (C)
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, 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/**
* @file rps/gnunet-service-rps_peers.c
* @brief utilities for managing (information about) peers
* @author Julius Bünger
*/
#include "gnunet_util_lib.h"
#include <inttypes.h>
/**
* Peer map to store peers with specialised use-cases (push_list, pull_list,
* view, ...)
*
* It is aimed for use as unordered list-like structures that can be indexed.
* Main use-case:
*
* permut = GNUNET_CRYPTO_random_permute (GNUNET_CRYPTO_QUALITY_STRONG,
* CustomPeerMap_size (peer_map));
* for (i = 0; i < some_border; i++)
* some_array[i] = *CustomPeerMap_get_peer_by_index (peer_map, permut[i]);
* for (i = some_border; i < CustomPeerMap_size (peer_map); i++)
* other_array[i-some_border] =
* *CustomPeerMap_get_peer_by_index (peer_map, permut[i]);
*
* This list is expected to
* - be altered in small steps frequently
* - be cleared regularily
* - often being queried whether a peer is contained
* - alter indices of peers
* - contain continous indices 0 <= i < len
* - not contain duplicate peers
*/
struct CustomPeerMap;
/**
* Create an empty peermap.
*
* @param len the initial length for the internal maps
*
* @return the newly created custom peer map
*/
struct CustomPeerMap *
CustomPeerMap_create (unsigned int len);
/**
* Get the size of the custom peer map
*
* @param c_peer_map the custom peer map to look in
*
* @return size of the map
*/
int
CustomPeerMap_size (const struct CustomPeerMap *c_peer_map);
/**
* Insert peer into the custom peer map
*
* @param c_peer_map the custom peer map to insert peer
* @param peer the peer to insert
*
* @return GNUNET_OK if map did not contain peer previously
* GNUNET_NO if map did contain peer previously
*/
int
CustomPeerMap_put (const struct CustomPeerMap *c_peer_map,
const struct GNUNET_PeerIdentity *peer);
/**
* Check whether custom peer map contains a peer
*
* @param c_peer_map the custom peer map to look in
* @param peer the peer to check for
*
* @return GNUNET_OK if map contains peer
* GNUNET_NO otherwise
*/
int
CustomPeerMap_contains_peer (const struct CustomPeerMap *c_peer_map,
const struct GNUNET_PeerIdentity *peer);
/**
* Remove peer from custom peer map
*
* @param c_peer_map the custom peer map to remove the peer from
* @param peer the peer to remove
*
* @return GNUNET_OK if map contained peer and removed it successfully
* GNUNET_NO if map does not contain peer
*/
int
CustomPeerMap_remove_peer (const struct CustomPeerMap *c_peer_map,
const struct GNUNET_PeerIdentity *peer);
/**
* Get a peer by index
*
* @param c_peer_map the custom peer map to look in
* @param index the index of the peer to get
*
* @return peer to the corresponding index.
* if this index is not known, return NULL
*/
struct GNUNET_PeerIdentity *
CustomPeerMap_get_peer_by_index (const struct CustomPeerMap *c_peer_map,
uint32_t index);
/**
* Remove peer from custom peer map by index
*
* @param c_peer_map the custom peer map to remove the peer from
* @param index the index of the peer to remove
*
* @return GNUNET_OK if map contained peer and removed it successfully
* GNUNET_NO if map does not contain (index of) peer
*/
int
CustomPeerMap_remove_peer_by_index (const struct CustomPeerMap *c_peer_map,
uint32_t index);
/**
* Clear the custom peer map
*
* @param c_peer_map the custom peer map to look in
*
* @return size of the map
*/
void
CustomPeerMap_clear (const struct CustomPeerMap *c_peer_map);
/**
* Destroy peermap.
*
* @param c_peer_map the map to destroy
*/
void
CustomPeerMap_destroy (struct CustomPeerMap *c_peer_map);
/* end of gnunet-service-rps_peers.c */
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