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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 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 core/core_api_peer_request.c
* @brief implementation of the peer_request functions
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_core_service.h"
#include "core.h"
/**
* Handle for a request to the core to connect or disconnect
* from a particular peer. Can be used to cancel the request
* (before the 'cont'inuation is called).
*/
struct GNUNET_CORE_PeerRequestHandle
{
/**
* Our connection to the service.
*/
struct GNUNET_CLIENT_Connection *client;
/**
* Scheduler.
*/
struct GNUNET_SCHEDULER_Handle *sched;
/**
* Function to call once done.
*/
GNUNET_SCHEDULER_Task cont;
/**
* Closure for 'cont'.
*/
void *cont_cls;
/**
* Identity of the peer to connect/disconnect.
*/
struct GNUNET_PeerIdentity peer;
/**
* Message type to use.
*/
uint16_t type;
};
/**
* Transmit the request to the core service.
*
* @param cls our 'struct GNUNET_CORE_PeerRequestHandle'
* @param size number of bytes available in buf
* @param buf where the callee should write the message
* @return number of bytes written to buf
*/
static size_t
send_request (void *cls,
size_t size,
void *buf)
{
struct GNUNET_CORE_PeerRequestHandle * prh = cls;
struct ConnectMessage msg;
if (buf == NULL)
{
GNUNET_SCHEDULER_add_continuation (prh->sched,
prh->cont,
prh->cont_cls,
GNUNET_SCHEDULER_REASON_TIMEOUT);
GNUNET_CLIENT_disconnect (prh->client);
GNUNET_free (prh);
return 0;
}
GNUNET_assert (size >= sizeof (struct ConnectMessage));
msg.header.type = htons (prh->type);
msg.header.size = htons (sizeof (struct ConnectMessage));
msg.reserved = htonl (0);
msg.peer = prh->peer;
memcpy (buf, &msg, sizeof (msg));
GNUNET_SCHEDULER_add_continuation (prh->sched,
prh->cont,
prh->cont_cls,
GNUNET_SCHEDULER_REASON_PREREQ_DONE);
GNUNET_CLIENT_disconnect (prh->client);
GNUNET_free (prh);
return sizeof (msg);
}
/**
* Request that the core should try to connect to a particular peer.
* Once the request has been transmitted to the core, the continuation
* function will be called. Note that this does NOT mean that a
* connection was successfully established -- it only means that the
* core will now try. Successful establishment of the connection
* will be signalled to the 'connects' callback argument of
* 'GNUNET_CORE_connect' only. If the core service does not respond
* to our connection attempt within the given time frame, 'cont' will
* be called with the TIMEOUT reason code.
*
* @param sched scheduler to use
* @param cfg configuration to use
* @param timeout how long to try to talk to core
* @param cont function to call once the request has been completed (or timed out)
* @param cont_cls closure for cont
* @return NULL on error (cont will not be called), otherwise handle for cancellation
*/
struct GNUNET_CORE_PeerRequestHandle *
GNUNET_CORE_peer_request_connect (struct GNUNET_SCHEDULER_Handle *sched,
const struct GNUNET_CONFIGURATION_Handle *cfg,
struct GNUNET_TIME_Relative timeout,
const struct GNUNET_PeerIdentity * peer,
GNUNET_SCHEDULER_Task cont,
void *cont_cls)
{
struct GNUNET_CORE_PeerRequestHandle *ret;
struct GNUNET_CLIENT_Connection *client;
client = GNUNET_CLIENT_connect (sched, "core", cfg);
if (client == NULL)
return NULL;
ret = GNUNET_malloc (sizeof (struct GNUNET_CORE_PeerRequestHandle));
ret->client = client;
ret->sched = sched;
ret->cont = cont;
ret->cont_cls = cont_cls;
ret->peer = *peer;
ret->type = GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT;
GNUNET_CLIENT_notify_transmit_ready (client,
sizeof (struct ConnectMessage),
timeout,
GNUNET_YES,
&send_request,
ret);
return ret;
}
/**
* Request that the core should try to disconnect from a particular
* peer. Once the request has been transmitted to the core, the
* continuation function will be called. Note that this does NOT mean
* that a connection was successfully cut -- it only means that the
* core will now try. Typically this will work pretty much
* immediately, but it is at least in theory also possible that a
* reconnect is also triggered rather quickly. Successful creation
* and destruction of connections will be signalled to the 'connects'
* and 'disconnects' callback arguments of 'GNUNET_CORE_connect' only.
* If the core service does not respond to our connection attempt
* within the given time frame, 'cont' will be called with the TIMEOUT
* reason code.
*
* @param sched scheduler to use
* @param cfg configuration to use
* @param timeout how long to try to talk to core
* @param cont function to call once the request has been completed (or timed out)
* @param cont_cls closure for cont
* @return NULL on error (cont will not be called), otherwise handle for cancellation
*/
struct GNUNET_CORE_PeerRequestHandle *
GNUNET_CORE_peer_request_disconnect (struct GNUNET_SCHEDULER_Handle *sched,
const struct GNUNET_CONFIGURATION_Handle *cfg,
struct GNUNET_TIME_Relative timeout,
const struct GNUNET_PeerIdentity * peer,
GNUNET_SCHEDULER_Task cont,
void *cont_cls)
{
struct GNUNET_CORE_PeerRequestHandle *ret;
struct GNUNET_CLIENT_Connection *client;
client = GNUNET_CLIENT_connect (sched, "core", cfg);
if (client == NULL)
return NULL;
ret = GNUNET_malloc (sizeof (struct GNUNET_CORE_PeerRequestHandle));
ret->client = client;
ret->sched = sched;
ret->cont = cont;
ret->cont_cls = cont_cls;
ret->peer = *peer;
ret->type = GNUNET_MESSAGE_TYPE_CORE_REQUEST_DISCONNECT;
GNUNET_CLIENT_notify_transmit_ready (client,
sizeof (struct ConnectMessage),
timeout,
GNUNET_YES,
&send_request,
ret);
return ret;
}
/**
* Cancel a pending request to connect or disconnect from/to a particular
* peer. Must not be called after the 'cont' function was invoked.
*
* @param req request handle that was returned for the original request
*/
void
GNUNET_CORE_peer_request_cancel (struct GNUNET_CORE_PeerRequestHandle *req)
{
GNUNET_CLIENT_disconnect (req->client);
GNUNET_free (req);
}
/* end of core_api_peer_request.c */
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