/*
     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);


/**
 * 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.
 * 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
 */
void
GNUNET_PEERINFO_for_all (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);


#if 0                           /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif


/* end of gnunet_peerinfo_service.h */
#endif