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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 core/core_api_peer_get_info.c
* @brief implementation of the peer_change_preference functions
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_core_service.h"
#include "core.h"
struct GNUNET_CORE_InformationRequestContext
{
/**
* Our connection to the service.
*/
struct GNUNET_CLIENT_Connection *client;
/**
* Function to call with the information.
*/
GNUNET_CORE_PeerConfigurationInfoCallback info;
/**
* Closure for info.
*/
void *info_cls;
};
/**
* Receive reply from core service with information about a peer.
*
* @param cls our 'struct GNUNET_CORE_InformationRequestContext *'
* @param msg NULL on error (i.e. timeout)
*/
static void
receive_info (void *cls,
const struct GNUNET_MessageHeader *msg)
{
struct GNUNET_CORE_InformationRequestContext *irc = cls;
const struct ConfigurationInfoMessage *cim;
static struct GNUNET_BANDWIDTH_Value32NBO zbw; /* zero bandwidth */
if (msg == NULL)
{
if (irc->info != NULL)
irc->info (irc->info_cls,
NULL, zbw, zbw, 0, 0);
GNUNET_CLIENT_disconnect (irc->client, GNUNET_NO);
GNUNET_free (irc);
return;
}
if ( (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO) ||
(ntohs (msg->size) != sizeof (struct ConfigurationInfoMessage)) )
{
GNUNET_break (0);
if (irc->info != NULL)
irc->info (irc->info_cls,
NULL, zbw, zbw, 0, 0);
GNUNET_CLIENT_disconnect (irc->client, GNUNET_NO);
GNUNET_free (irc);
return;
}
cim = (const struct ConfigurationInfoMessage*) msg;
if (irc->info != NULL)
irc->info (irc->info_cls,
&cim->peer,
cim->bw_in,
cim->bw_out,
ntohl (cim->reserved_amount),
GNUNET_ntohll (cim->preference));
GNUNET_CLIENT_disconnect (irc->client, GNUNET_NO);
GNUNET_free (irc);
}
/**
* Obtain statistics and/or change preferences for the given peer.
*
* @param cfg configuration to use
* @param peer identifies the peer
* @param timeout after how long should we give up (and call "info" with NULL
* for "peer" to signal an error)?
* @param bw_out set to the current bandwidth limit (sending) for this peer,
* caller should set "bw_out" to "-1" to avoid changing
* the current value; otherwise "bw_out" will be lowered to
* the specified value; passing a pointer to "0" can be used to force
* us to disconnect from the peer; "bw_out" might not increase
* as specified since the upper bound is generally
* determined by the other peer!
* @param amount reserve N bytes for receiving, negative
* amounts can be used to undo a (recent) reservation;
* @param preference increase incoming traffic share preference by this amount;
* in the absence of "amount" reservations, we use this
* preference value to assign proportional bandwidth shares
* to all connected peers
* @param info function to call with the resulting configuration information
* @param info_cls closure for info
* @return NULL on error
*/
struct GNUNET_CORE_InformationRequestContext *
GNUNET_CORE_peer_change_preference (const struct GNUNET_CONFIGURATION_Handle *cfg,
const struct GNUNET_PeerIdentity *peer,
struct GNUNET_TIME_Relative timeout,
struct GNUNET_BANDWIDTH_Value32NBO bw_out,
int32_t amount,
uint64_t preference,
GNUNET_CORE_PeerConfigurationInfoCallback info,
void *info_cls)
{
struct GNUNET_CORE_InformationRequestContext *irc;
struct RequestInfoMessage rim;
struct GNUNET_CLIENT_Connection *client;
int retry;
client = GNUNET_CLIENT_connect ("core", cfg);
if (client == NULL)
return NULL;
irc = GNUNET_malloc (sizeof (struct GNUNET_CORE_InformationRequestContext));
irc->client = client;
irc->info = info;
irc->info_cls = info_cls;
rim.header.size = htons (sizeof (struct RequestInfoMessage));
rim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO);
rim.reserved = htonl (0);
rim.limit_outbound = bw_out;
rim.reserve_inbound = htonl (amount);
rim.preference_change = GNUNET_htonll(preference);
rim.peer = *peer;
retry = ( (amount == 0) && (preference == 0) ) ? GNUNET_YES : GNUNET_NO;
GNUNET_assert (GNUNET_OK == GNUNET_CLIENT_transmit_and_get_response (client,
&rim.header,
timeout,
retry,
&receive_info,
irc));
return irc;
}
/**
* Cancel request for getting information about a peer.
*
* @param irc context returned by the original GNUNET_CORE_peer_get_info call
*/
void
GNUNET_CORE_peer_change_preference_cancel (struct GNUNET_CORE_InformationRequestContext *irc)
{
GNUNET_CLIENT_disconnect (irc->client, GNUNET_NO);
GNUNET_free (irc);
}
/* end of core_api_peer_get_info.c */
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