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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 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/>.
*/
/**
* @file rps/gnunet-service-rps_sampler_elem.h
* @brief sampler element implementation
* @author Julius Bünger
*/
#ifndef RPS_SAMPLER_ELEM_H
#define RPS_SAMPLER_ELEM_H
#include <inttypes.h>
/***********************************************************************
* WARNING: This section needs to be reviewed regarding the use of
* functions providing (pseudo)randomness!
***********************************************************************/
/**
* Used to indicate whether a sampler element is empty.
*/
enum RPS_SamplerEmpty
{
NOT_EMPTY = 0x0,
EMPTY = 0x1
};
/**
* A sampler element sampling one PeerID at a time.
*/
struct RPS_SamplerElement
{
/**
* Min-wise linear permutation used by this sampler.
*
* This is an key later used by a hmac.
*/
struct GNUNET_CRYPTO_AuthKey auth_key;
/**
* The PeerID this sampler currently samples.
*/
struct GNUNET_PeerIdentity peer_id;
/**
* The according hash value of this PeerID.
*/
struct GNUNET_HashCode peer_id_hash;
/**
* Time of last request.
*/
struct GNUNET_TIME_Absolute last_client_request;
/**
* Flag that indicates that we are not holding a valid PeerID right now.
*/
enum RPS_SamplerEmpty is_empty;
/**
* 'Birth'
*/
struct GNUNET_TIME_Absolute birth;
/**
* How many times a PeerID was put in this sampler.
*/
uint32_t num_peers;
/**
* How many times this sampler changed the peer_id.
*/
uint32_t num_change;
/**
* The file name this sampler element should log to
*/
char *file_name;
};
/**
* Reinitialise a previously initialised sampler element.
*
* @param sampler pointer to the memory that keeps the value.
*/
void
RPS_sampler_elem_reinit (struct RPS_SamplerElement *sampler_el);
/**
* Create a sampler element and initialise it.
*
* In this implementation this means choosing an auth_key for later use in
* a hmac at random.
*
* @return a newly created RPS_SamplerElement which currently holds no id.
*/
struct RPS_SamplerElement *
RPS_sampler_elem_create (void);
/**
* Destroy a sampler element.
*
* @param sampler_elem the element to destroy
*/
void
RPS_sampler_elem_destroy (struct RPS_SamplerElement *sampler_elem);
/**
* Input an PeerID into the given sampler element.
*
* @param sampler the sampler the @a s_elem belongs to.
* Needed to know the
*/
void
RPS_sampler_elem_next (struct RPS_SamplerElement *s_elem,
const struct GNUNET_PeerIdentity *new_ID);
/**
* Initialise the min-wise independent function of the given sampler element.
*
* @param s_elem the sampler element
* @param auth_key the key to use
*/
void
RPS_sampler_elem_set (struct RPS_SamplerElement *s_elem,
struct GNUNET_CRYPTO_AuthKey auth_key);
#endif /* RPS_SAMPLER_ELEM_H */
/* end of gnunet-service-rps.c */
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