/*
      This file is part of GNUnet
      Copyright (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/gnunet-service-test-barriers.c
 * @brief Daemon acting as a service for testing testbed barriers.  It is
 *   started as a peer service and waits for a barrier to be crossed.
 * @author Sree Harsha Totakura <sreeharsha@totakura.in>
 */

#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_testbed_service.h"
#include "test_testbed_api_barriers.h"

/**
 * logging short hand
 */
#define LOG(type,...) \
  GNUNET_log (type, __VA_ARGS__);

/**
 * Our barrier wait handle
 */
struct GNUNET_TESTBED_BarrierWaitHandle *wh;


/**
 * Dummy task callback to keep us running forever
 *
 * @param cls NULL
 * @param tc scheduler task context
 */
static void
do_shutdown (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  if (NULL != wh)
    GNUNET_TESTBED_barrier_wait_cancel (wh);
  wh = NULL;
}


/**
 * Functions of this type are to be given as acallback argumetn to
 * GNUNET_TESTBED_barrier_wait().  The callback will be called when the barrier
 * corresponding given in GNUNET_TESTBED_barrier_wait() is crossed or cancelled.
 *
 * @param cls NULL
 * @param name the barrier name
 * @param status GNUNET_SYSERR in case of error while waiting for the barrier;
 *   GNUNET_OK if the barrier is crossed
 */
static void
barrier_wait_cb (void *cls, const char *name, int status)
{
  GNUNET_break (NULL == cls);
  wh = NULL;
  GNUNET_break (GNUNET_OK == status);
}


/**
 * Task to wait for the barrier
 *
 * @param cls NULL
 * @param tc scheduler task context
 * @return
 */
static void
do_wait (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
    return;
  wh = GNUNET_TESTBED_barrier_wait (TEST_BARRIER_NAME, &barrier_wait_cb, NULL);
  GNUNET_break (NULL != wh);
}


/**
 * Main run function.
 *
 * @param cls NULL
 * @param args arguments passed to GNUNET_PROGRAM_run
 * @param cfgfile the path to configuration file
 * @param config the configuration file handle
 */
static void
run (void *cls, char *const *args, const char *cfgfile,
     const struct GNUNET_CONFIGURATION_Handle *config)
{
  unsigned int rsec;

  rsec = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, 10);
  GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
                                (GNUNET_TIME_UNIT_SECONDS, rsec),
                                &do_wait, NULL);
  GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
                                &do_shutdown, NULL);
}



/**
 * Main
 */
int main (int argc, char **argv)
{
  struct GNUNET_GETOPT_CommandLineOption options[] = {
    GNUNET_GETOPT_OPTION_END
  };
  int ret;

  ret =
      GNUNET_PROGRAM_run (argc, argv,
                          "test-barriers", "nohelp", options, &run, NULL);
  return ret;
}