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/*
This file is part of GNUnet
(C) 2009, 2010 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 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., 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).
* @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
/**
* Handle to the peerinfo service.
*/
struct GNUNET_PEERINFO_Handle;
/**
* Connect to the peerinfo service.
*
* @param cfg configuration to use
* @return NULL on error (configuration related, actual connection
* etablishment may happen asynchronously).
*/
struct GNUNET_PEERINFO_Handle *
GNUNET_PEERINFO_connect (const struct GNUNET_CONFIGURATION_Handle *cfg);
/**
* Disconnect from the peerinfo service. Note that all iterators must
* have completed or have been cancelled by the time this function is
* called (otherwise, calling this function is a serious error).
* Furthermore, if 'GNUNET_PEERINFO_add_peer' operations are still
* pending, they will be cancelled silently on disconnect.
*
* @param h handle to disconnect
*/
void
GNUNET_PEERINFO_disconnect (struct GNUNET_PEERINFO_Handle *h);
/**
* Add a host to the persistent list. This method operates in
* semi-reliable mode: if the transmission is not completed by
* the time 'GNUNET_PEERINFO_disconnect' is called, it will be
* aborted. Furthermore, if a second HELLO is added for the
* same peer before the first one was transmitted, PEERINFO may
* merge the two HELLOs prior to transmission to the service.
*
* @param h handle to the peerinfo service
* @param hello the verified (!) HELLO message
*/
void
GNUNET_PEERINFO_add_peer (struct GNUNET_PEERINFO_Handle *h,
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 error message
*/
typedef void (*GNUNET_PEERINFO_Processor) (void *cls,
const struct GNUNET_PeerIdentity *
peer,
const struct GNUNET_HELLO_Message *
hello, const char *err_msg);
/**
* Handle for cancellation of iteration over peers.
*/
struct GNUNET_PEERINFO_IteratorContext;
/**
* Call a method for each known matching host to get its HELLO.
* The callback method will be invoked once for each matching
* host and then finally once with a NULL pointer. After that final
* invocation, the iterator context must no longer be used.
*
* Instead of calling this function with 'peer == NULL'
* it is often better to use 'GNUNET_PEERINFO_notify'.
*
* @param h handle to the peerinfo service
* @param peer restrict iteration to this peer only (can be NULL)
* @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 (struct GNUNET_PEERINFO_Handle *h,
const struct GNUNET_PeerIdentity *peer,
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 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,
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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