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/*
This file is part of GNUnet.
Copyright (C) 2009-2014 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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/**
* @file core/core_api_mq.c
* @brief MQ support for core service
* @author Christian Grothoff
* @author Florian Dold
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_constants.h"
#include "gnunet_core_service.h"
#include "core.h"
#define LOG(kind,...) GNUNET_log_from (kind, "core-api",__VA_ARGS__)
/**
* Internal state of a GNUNET-MQ queue for CORE.
*/
struct CoreMQState
{
/**
* Which peer does this queue target?
*/
struct GNUNET_PeerIdentity target;
/**
* Handle to the CORE service used by this MQ.
*/
struct GNUNET_CORE_Handle *core;
/**
* Transmission handle (if in use).
*/
struct GNUNET_CORE_TransmitHandle *th;
};
/**
* Function called to notify a client about the connection
* begin ready to queue more data. @a buf will be
* NULL and @a size zero if the connection was closed for
* writing in the meantime.
*
* @param cls closure
* @param size number of bytes available in @a buf
* @param buf where the callee should write the message
* @return number of bytes written to @a buf
*/
static size_t
core_mq_ntr (void *cls, size_t size,
void *buf)
{
struct GNUNET_MQ_Handle *mq = cls;
struct CoreMQState *mqs = GNUNET_MQ_impl_state (mq);
const struct GNUNET_MessageHeader *mh = GNUNET_MQ_impl_current (mq);
size_t msg_size = ntohs (mh->size);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"ntr called (size %u, type %u)\n",
msg_size,
ntohs (mh->type));
mqs->th = NULL;
if (NULL == buf)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"send error\n");
GNUNET_MQ_inject_error (mq, GNUNET_MQ_ERROR_WRITE);
return 0;
}
memcpy (buf, mh, msg_size);
GNUNET_MQ_impl_send_continue (mq);
return msg_size;
}
/**
* Signature of functions implementing the
* sending functionality of a message queue.
*
* @param mq the message queue
* @param msg the message to send
* @param impl_state state of the implementation
*/
static void
core_mq_send (struct GNUNET_MQ_Handle *mq,
const struct GNUNET_MessageHeader *msg,
void *impl_state)
{
struct CoreMQState *mqs = impl_state;
GNUNET_assert (NULL == mqs->th);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Sending queued message (size %u)\n",
ntohs (msg->size));
mqs->th = GNUNET_CORE_notify_transmit_ready (mqs->core, GNUNET_YES, 0,
GNUNET_TIME_UNIT_FOREVER_REL,
&mqs->target,
ntohs (msg->size),
&core_mq_ntr, mq);
}
/**
* Signature of functions implementing the
* destruction of a message queue.
* Implementations must not free @a mq, but should
* take care of @a impl_state.
*
* @param mq the message queue to destroy
* @param impl_state state of the implementation
*/
static void
core_mq_destroy (struct GNUNET_MQ_Handle *mq,
void *impl_state)
{
struct CoreMQState *mqs = impl_state;
if (NULL != mqs->th)
{
GNUNET_CORE_notify_transmit_ready_cancel (mqs->th);
mqs->th = NULL;
}
GNUNET_free (mqs);
}
/**
* Implementation function that cancels the currently sent message.
*
* @param mq message queue
* @param impl_state state specific to the implementation
*/
static void
core_mq_cancel (struct GNUNET_MQ_Handle *mq,
void *impl_state)
{
struct CoreMQState *mqs = impl_state;
GNUNET_assert (NULL != mqs->th);
GNUNET_CORE_notify_transmit_ready_cancel (mqs->th);
}
/**
* Create a message queue for sending messages to a peer with CORE.
* Messages may only be queued with #GNUNET_MQ_send once the init callback has
* been called for the given handle.
* There must only be one queue per peer for each core handle.
* The message queue can only be used to transmit messages,
* not to receive them.
*
* @param h the core handle
* @param target the target peer for this queue, may not be NULL
* @return a message queue for sending messages over the core handle
* to the target peer
*/
struct GNUNET_MQ_Handle *
GNUNET_CORE_mq_create (struct GNUNET_CORE_Handle *h,
const struct GNUNET_PeerIdentity *target)
{
struct CoreMQState *mqs = GNUNET_new (struct CoreMQState);
mqs->core = h;
mqs->target = *target;
return GNUNET_MQ_queue_for_callbacks (&core_mq_send,
&core_mq_destroy,
&core_mq_cancel,
mqs,
NULL, NULL, NULL);
}
/* end of core_api_mq.c */
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