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/*
This file is part of GNUnet.
(C) 2008--2013 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 testbed/testbed_api_barriers.c
* @brief API implementation for testbed barriers
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
*/
#include "platform.h"
#include "gnunet_testbed_service.h"
#include "testbed_api.h"
/**
* Handle for barrier
*/
struct GNUNET_TESTBED_Barrier
{
/**
* hashcode identifying this barrier in the hashmap
*/
struct GNUNET_HashCode key;
/**
* The controller handle given while initiliasing this barrier
*/
struct GNUNET_TESTBED_Controller *c;
/**
* The name of the barrier
*/
char *name;
/**
* The continuation callback to call when we have a status update on this
*/
GNUNET_TESTBED_barrier_status_cb cb;
/**
* the closure for the above callback
*/
void *cls;
};
/**
* handle for hashtable of barrier handles
*/
static struct GNUNET_CONTAINER_MultiHashMap *barrier_map;
/**
* Remove a barrier and it was the last one in the barrier hash map, destroy the
* hash map
*
* @param barrier the barrier to remove
*/
static void
barrier_remove (struct GNUNET_TESTBED_Barrier *barrier)
{
GNUNET_assert (NULL != barrier_map); /* No barriers present */
GNUNET_assert (GNUNET_OK ==
GNUNET_CONTAINER_multihashmap_remove (barrier_map,
&barrier->key,
barrier));
GNUNET_free (barrier->name);
GNUNET_free (barrier);
if (0 == GNUNET_CONTAINER_multihashmap_size (barrier_map))
{
GNUNET_CONTAINER_multihashmap_destroy (barrier_map);
barrier_map = NULL;
}
}
/**
* Handler for GNUNET_MESSAGE_TYPE_TESTBED_BARRIER_STATUS messages
*
* @param c the controller handle to determine the connection this message
* belongs to
* @param msg the barrier status message
* @return GNUNET_OK to keep the connection active; GNUNET_SYSERR to tear it
* down signalling an error
*/
int
GNUNET_TESTBED_handle_barrier_status_ (struct GNUNET_TESTBED_Controller *c,
const struct GNUNET_TESTBED_BarrierStatus
*msg)
{
struct GNUNET_TESTBED_Barrier *barrier;
char *emsg;
const char *name;
struct GNUNET_HashCode key;
size_t emsg_len;
int status;
uint16_t msize;
uint16_t name_len;
emsg = NULL;
barrier = NULL;
msize = ntohs (msg->header.size);
name = msg->data;
name_len = ntohs (msg->name_len);
if ( (sizeof (struct GNUNET_TESTBED_BarrierStatus) + name_len + 1 > msize)
|| ('\0' != name[name_len]) )
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
status = ntohs (msg->status);
if (0 != status)
{
status = -1;
emsg_len = msize - (sizeof (struct GNUNET_TESTBED_BarrierStatus) + name_len
+ 1);
if (0 == emsg_len)
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
emsg_len++;
emsg = GNUNET_malloc (emsg_len);
emsg_len--;
emsg[emsg_len] = '\0';
(void) memcpy (emsg, msg->data + name_len + 1, emsg_len);
}
if (NULL == barrier_map)
goto cleanup;
GNUNET_CRYPTO_hash (name, name_len, &key);
barrier = GNUNET_CONTAINER_multihashmap_get (barrier_map, &key);
if (NULL == barrier)
goto cleanup;
GNUNET_assert (NULL != barrier->cb);
barrier->cb (barrier->cls, name, barrier, status, emsg);
cleanup:
GNUNET_free_non_null (emsg);
if (NULL != barrier)
barrier_remove (barrier);
return GNUNET_OK;
}
/**
* Initialise a barrier and call the given callback when the required percentage
* of peers (quorum) reach the barrier OR upon error.
*
* @param controller the handle to the controller
* @param name identification name of the barrier
* @param quorum the percentage of peers that is required to reach the barrier.
* Peers signal reaching a barrier by calling
* GNUNET_TESTBED_barrier_reached().
* @param cb the callback to call when the barrier is reached or upon error.
* Cannot be NULL.
* @param cls closure for the above callback
* @return barrier handle; NULL upon error
*/
struct GNUNET_TESTBED_Barrier *
GNUNET_TESTBED_barrier_init (struct GNUNET_TESTBED_Controller *controller,
const char *name,
unsigned int quorum,
GNUNET_TESTBED_barrier_status_cb cb, void *cls)
{
struct GNUNET_TESTBED_Barrier *barrier;
struct GNUNET_HashCode key;
size_t name_len;
GNUNET_assert (quorum <= 100);
GNUNET_assert (NULL != cb);
name_len = strlen (name);
GNUNET_assert (0 < name_len);
GNUNET_CRYPTO_hash (name, name_len, &key);
if (NULL == barrier_map)
barrier_map = GNUNET_CONTAINER_multihashmap_create (3, GNUNET_YES);
if (GNUNET_YES ==
GNUNET_CONTAINER_multihashmap_contains (barrier_map, &key))
{
GNUNET_break (0);
return NULL;
}
barrier = GNUNET_malloc (sizeof (struct GNUNET_TESTBED_Barrier));
barrier->name = GNUNET_strdup (name);
barrier->cb = cb;
barrier->cls = cls;
(void) memcpy (&barrier->key, &key, sizeof (struct GNUNET_HashCode));
GNUNET_assert (GNUNET_OK ==
GNUNET_CONTAINER_multihashmap_put (barrier_map, &barrier->key,
barrier,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
return barrier;
}
/**
* Cancel a barrier.
*
* @param barrier the barrier handle
*/
void
GNUNET_TESTBED_barrier_cancel (struct GNUNET_TESTBED_Barrier *barrier)
{
barrier_remove (barrier);
}
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