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/*
This file is part of GNUnet
(C) 2009 Christian Grothoff (and other contributing authors)
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 2, 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file include/gnunet_peerinfo_service.h
* @brief Code to maintain the list of currently known hosts
* (in memory structure of data/hosts) and their trust ratings
* (in memory structure of data/trust)
* @author Christian Grothoff
*/
#ifndef GNUNET_PEERINFO_SERVICE_H
#define GNUNET_PEERINFO_SERVICE_H
#include "gnunet_common.h"
#include "gnunet_configuration_lib.h"
#include "gnunet_crypto_lib.h"
#include "gnunet_hello_lib.h"
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
/**
* Add a host to the persistent list.
*
* @param cfg configuration to use
* @param sched scheduler to use
* @param peer identity of the peer
* @param hello the verified (!) HELLO message
*/
void
GNUNET_PEERINFO_add_peer (const struct GNUNET_CONFIGURATION_Handle *cfg,
struct GNUNET_SCHEDULER_Handle *sched,
const struct GNUNET_PeerIdentity *peer,
const struct GNUNET_HELLO_Message *hello);
/**
* Type of an iterator over the hosts. Note that each
* host will be called with each available protocol.
*
* @param cls closure
* @param peer id of the peer, NULL for last call
* @param hello hello message for the peer (can be NULL)
* @param trust amount of trust we have in the peer
*/
typedef void
(*GNUNET_PEERINFO_Processor) (void *cls,
const struct GNUNET_PeerIdentity * peer,
const struct GNUNET_HELLO_Message * hello,
uint32_t trust);
/**
* Handle for cancellation of iteration over peers.
*/
struct GNUNET_PEERINFO_IteratorContext;
/**
* Call a method for each known matching host and change
* its trust value. The method will be invoked once for
* each host and then finally once with a NULL pointer. After
* that final invocation, the iterator context must no longer
* be used.
*
* Note that the last call can be triggered by timeout or by simply
* being done; however, the trust argument will be set to zero if we
* are done, 1 if we timed out and 2 for fatal error.
*
* @param cfg configuration to use
* @param sched scheduler to use
* @param peer restrict iteration to this peer only (can be NULL)
* @param trust_delta how much to change the trust in all matching peers
* @param timeout how long to wait until timing out
* @param callback the method to call for each peer
* @param callback_cls closure for callback
* @return NULL on error (in this case, 'callback' is never called!),
* otherwise an iterator context
*/
struct GNUNET_PEERINFO_IteratorContext *
GNUNET_PEERINFO_iterate (const struct GNUNET_CONFIGURATION_Handle *cfg,
struct GNUNET_SCHEDULER_Handle *sched,
const struct GNUNET_PeerIdentity *peer,
int trust_delta,
struct GNUNET_TIME_Relative timeout,
GNUNET_PEERINFO_Processor callback,
void *callback_cls);
/**
* Cancel an iteration over peer information.
*
* @param ic context of the iterator to cancel
*/
void
GNUNET_PEERINFO_iterate_cancel (struct GNUNET_PEERINFO_IteratorContext *ic);
/**
* Handle for notifications about changes to the set of known peers.
*/
struct GNUNET_PEERINFO_NotifyContext;
/**
* Call a method whenever our known information about peers
* changes. Initially calls the given function for all known
* peers and then only signals changes. Note that it is
* possible (i.e. on disconnects) that the callback is called
* twice with the same peer information.
*
* @param cfg configuration to use
* @param sched scheduler to use
* @param callback the method to call for each peer
* @param callback_cls closure for callback
* @return NULL on error
*/
struct GNUNET_PEERINFO_NotifyContext *
GNUNET_PEERINFO_notify (const struct GNUNET_CONFIGURATION_Handle *cfg,
struct GNUNET_SCHEDULER_Handle *sched,
GNUNET_PEERINFO_Processor callback,
void *callback_cls);
/**
* Stop notifying about changes.
*
* @param nc context to stop notifying
*/
void
GNUNET_PEERINFO_notify_cancel (struct GNUNET_PEERINFO_NotifyContext *nc);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
/* end of gnunet_peerinfo_service.h */
#endif
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