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/*
This file is part of GNUnet
(C) 2012 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 consensus/gnunet-consensus.c
* @brief
* @author Florian Dold
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_consensus_service.h"
/**
* Handle to the consensus service
*/
static struct GNUNET_CONSENSUS_Handle *consensus;
/**
* Session id
*/
static char *session_id_str;
/**
* File handle to STDIN
*/
static struct GNUNET_DISK_FileHandle *stdin_fh;
/**
* Task for reading from stdin
*/
static GNUNET_SCHEDULER_TaskIdentifier stdin_tid = GNUNET_SCHEDULER_NO_TASK;
static void
stdin_cb (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
/**
* Called when a conclusion was successful.
*
* @param cls
* @param num_peers_in_consensus
* @param peers_in_consensus
*/
static void
conclude_cb (void *cls,
unsigned int consensus_group_count,
const struct GNUNET_CONSENSUS_Group *groups)
{
printf("reached conclusion\n");
GNUNET_SCHEDULER_shutdown ();
}
static void
insert_done_cb (void *cls,
int success)
{
struct GNUNET_CONSENSUS_Element *element = cls;
GNUNET_free (element);
if (GNUNET_YES != success)
{
printf ("insert failed\n");
GNUNET_SCHEDULER_shutdown ();
return;
}
GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == stdin_tid);
stdin_tid = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL, stdin_fh,
&stdin_cb, NULL);
}
/**
* Called whenever we can read stdin non-blocking
*
* @param cls unused
* @param tc scheduler context
*/
static void
stdin_cb (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
char buf[1024];
char *ret;
struct GNUNET_CONSENSUS_Element *element;
stdin_tid = GNUNET_SCHEDULER_NO_TASK;
if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
return; /* we're done here */
ret = fgets (buf, 1024, stdin);
if (NULL == ret)
{
if (feof (stdin))
{
printf ("concluding ...\n");
GNUNET_CONSENSUS_conclude (consensus, GNUNET_TIME_UNIT_FOREVER_REL, 0, conclude_cb, NULL);
}
return;
}
printf("read: %s", buf);
element = GNUNET_malloc (sizeof (struct GNUNET_CONSENSUS_Element) + strlen(buf) + 1);
element->type = 0;
element->size = strlen(buf) + 1;
element->data = &element[1];
strcpy ((char *) &element[1], buf);
GNUNET_CONSENSUS_insert (consensus, element, &insert_done_cb, element);
}
/**
* Called when a new element was received from another peer, or an error occured.
*
* May deliver duplicate values.
*
* Elements given to a consensus operation by the local peer are NOT given
* to this callback.
*
* @param cls closure
* @param element new element, NULL on error
* @return GNUNET_OK if the valid is well-formed and should be added to the consensus,
* GNUNET_SYSERR if the element should be ignored and not be propagated
*/
static int
cb (void *cls,
struct GNUNET_CONSENSUS_Element *element)
{
if (NULL == element)
{
printf("error receiving from consensus\n");
GNUNET_SCHEDULER_shutdown ();
return GNUNET_NO;
}
printf("got element\n");
return GNUNET_YES;
}
/**
* Function run on shutdown to clean up.
*
* @param cls the statistics handle
* @param tc scheduler context
*/
static void
shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO, "shutting down\n");
if (NULL != consensus)
{
GNUNET_CONSENSUS_destroy (consensus);
consensus = NULL;
}
}
static void
run (void *cls, char *const *args, const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct GNUNET_HashCode sid;
struct GNUNET_PeerIdentity *pids;
int count;
int i;
if (NULL == session_id_str)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "no session id given (missing -s/--session-id)\n");
return;
}
GNUNET_CRYPTO_hash (session_id_str, strlen (session_id_str), &sid);
for (count = 0; NULL != args[count]; count++);
if (0 != count)
{
pids = GNUNET_malloc (count * sizeof (struct GNUNET_PeerIdentity));
}
else
{
pids = NULL;
}
for (i = 0; i < count; i++)
{
int ret;
ret = GNUNET_CRYPTO_hash_from_string (args[i], &pids[i].hashPubKey);
if (GNUNET_OK != ret)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "peer identity '%s' is malformed\n", args[i]);
return;
}
}
GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
&shutdown_task, NULL);
consensus =
GNUNET_CONSENSUS_create (cfg,
count, pids,
&sid,
&cb, NULL);
stdin_fh = GNUNET_DISK_get_handle_from_native (stdin);
stdin_tid = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL, stdin_fh,
&stdin_cb, NULL);
}
int
main (int argc, char **argv)
{
static const struct GNUNET_GETOPT_CommandLineOption options[] = {
{ 's', "session-id", "ID",
gettext_noop ("session identifier"),
GNUNET_YES, &GNUNET_GETOPT_set_string, &session_id_str },
GNUNET_GETOPT_OPTION_END
};
GNUNET_PROGRAM_run (argc, argv, "gnunet-consensus",
"help",
options, &run, NULL);
return 0;
}
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