gnunet-nse-profiler.c

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/*
     This file is part of GNUnet.
     Copyright (C) 2011, 2012 GNUnet e.V.

     GNUnet is free software: you can redistribute it and/or modify it
     under the terms of the GNU Affero General Public License as published
     by the Free Software Foundation, either version 3 of the License,
     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
     Affero General Public License for more details.
    
     You should have received a copy of the GNU Affero General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.

     SPDX-License-Identifier: AGPL3.0-or-later
*/
#include "platform.h"
#include "gnunet_testbed_service.h"
#include "gnunet_nse_service.h"

#define LOG(kind,...)                                           \
  GNUNET_log (kind, __VA_ARGS__)

#define LOG_DEBUG(...)                          \
  LOG (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)


struct NSEPeer
{
  struct NSEPeer *prev;

  struct NSEPeer *next;

  struct GNUNET_TESTBED_Peer *daemon;

  struct GNUNET_TESTBED_Operation *nse_op;

  struct GNUNET_TESTBED_Operation *stat_op;

  struct GNUNET_STATISTICS_Handle *sh;
};


struct OpListEntry
{
  struct OpListEntry *next;

  struct OpListEntry *prev;

  struct GNUNET_TESTBED_Operation *op;

  int delta;
};


static struct NSEPeer *peer_head;

static struct NSEPeer *peer_tail;

static int ok;

static unsigned int verbose;

static char *hosts_file;

static unsigned int num_peers;

static unsigned int num_rounds;

static unsigned int current_round;

static unsigned int *num_peers_in_round;

static unsigned int peers_running;

static char *num_peer_spec;

static struct GNUNET_TESTBED_Peer **daemons;

static struct GNUNET_CONFIGURATION_Handle *testing_cfg;

static unsigned int connection_limit;

static unsigned int total_connections;

static struct GNUNET_DISK_FileHandle *output_file;

static char *output_filename;

static struct GNUNET_DISK_FileHandle *data_file;

static char *data_filename;

static struct GNUNET_TIME_Relative wait_time = { 60 * 1000 };

static struct OpListEntry *oplist_head;

static struct OpListEntry *oplist_tail;

static struct GNUNET_SCHEDULER_Task *round_task;


static void
close_monitor_connections ()
{
  struct NSEPeer *pos;
  struct OpListEntry *oplist_entry;

  while (NULL != (pos = peer_head))
  {
    if (NULL != pos->nse_op)
      GNUNET_TESTBED_operation_done (pos->nse_op);
    if (NULL != pos->stat_op)
      GNUNET_TESTBED_operation_done (pos->stat_op);
    GNUNET_CONTAINER_DLL_remove (peer_head, peer_tail, pos);
    GNUNET_free (pos);
  }
  while (NULL != (oplist_entry = oplist_head))
  {
    GNUNET_CONTAINER_DLL_remove (oplist_head, oplist_tail, oplist_entry);
    GNUNET_TESTBED_operation_done (oplist_entry->op);
    GNUNET_free (oplist_entry);
  }
}


static void
shutdown_task (void *cls)
{
  LOG_DEBUG ("Ending test.\n");
  close_monitor_connections ();
  if (NULL != round_task)
  {
    GNUNET_SCHEDULER_cancel (round_task);
    round_task = NULL;
  }
  if (NULL != data_file)
  {
    GNUNET_DISK_file_close (data_file);
    data_file = NULL;
  }
  if (NULL != output_file)
  {
    GNUNET_DISK_file_close (output_file);
    output_file = NULL;
  }
  if (NULL != testing_cfg)
  {
    GNUNET_CONFIGURATION_destroy (testing_cfg);
    testing_cfg = NULL;
  }
}


static void
handle_estimate (void *cls,
                 struct GNUNET_TIME_Absolute timestamp,
                 double estimate, double std_dev)
{
  struct NSEPeer *peer = cls;
  char output_buffer[512];
  size_t size;

  if (NULL == output_file)
    {
      FPRINTF (stderr,
               "Received network size estimate from peer %p. Size: %f std.dev. %f\n",
               peer, estimate, std_dev);
      return;
    }
  size = GNUNET_snprintf (output_buffer,
                          sizeof (output_buffer),
                          "%p %llu %llu %f %f %f\n",
                          peer, peers_running,
                          (unsigned long long) timestamp.abs_value_us,
                          GNUNET_NSE_log_estimate_to_n (estimate), estimate,
                          std_dev);
  if (size != GNUNET_DISK_file_write (output_file, output_buffer, size))
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "Unable to write to file!\n");
}


static void *
nse_connect_adapter (void *cls,
                     const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  struct NSEPeer *current_peer = cls;

  return GNUNET_NSE_connect (cfg, &handle_estimate, current_peer);
}


static void
nse_disconnect_adapter (void *cls,
                        void *op_result)
{
  GNUNET_NSE_disconnect (op_result);
}


static int
stat_iterator (void *cls,
               const char *subsystem,
               const char *name,
               uint64_t value,
               int is_persistent)
{
  char *output_buffer;
  struct GNUNET_TIME_Absolute now;
  int size;
  unsigned int flag;

  GNUNET_assert (NULL != data_file);
  now = GNUNET_TIME_absolute_get ();
  flag = strcasecmp (subsystem, "core");
  if (0 != flag)
    flag = 1;
  size = GNUNET_asprintf (&output_buffer, "%llu %llu %u\n",
                          now.abs_value_us / 1000LL / 1000LL,
                          value, flag);
  if (0 > size)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Error formatting output buffer.\n");
    GNUNET_free (output_buffer);
    return GNUNET_SYSERR;
  }
  if (size != GNUNET_DISK_file_write (data_file, output_buffer, (size_t) size))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Unable to write to file!\n");
    GNUNET_free (output_buffer);
    return GNUNET_SYSERR;
  }
  GNUNET_free (output_buffer);
  return GNUNET_OK;
}


static void *
stat_connect_adapter (void *cls,
                      const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  struct NSEPeer *peer = cls;

  peer->sh = GNUNET_STATISTICS_create ("nse-profiler", cfg);
  return peer->sh;
}


static void
stat_disconnect_adapter (void *cls, void *op_result)
{
  struct NSEPeer *peer = cls;

  GNUNET_break (GNUNET_OK == GNUNET_STATISTICS_watch_cancel
                (peer->sh, "core", "# peers connected",
                 stat_iterator, peer));
  GNUNET_break (GNUNET_OK == GNUNET_STATISTICS_watch_cancel
                (peer->sh, "nse", "# peers connected",
                 stat_iterator, peer));
  GNUNET_STATISTICS_destroy (op_result, GNUNET_NO);
  peer->sh = NULL;
}


static void
stat_comp_cb (void *cls, struct GNUNET_TESTBED_Operation *op,
              void *ca_result, const char *emsg )
{
  struct GNUNET_STATISTICS_Handle *sh = ca_result;
  struct NSEPeer *peer = cls;

  if (NULL != emsg)
  {
    GNUNET_break (0);
    return;
  }
  GNUNET_break (GNUNET_OK == GNUNET_STATISTICS_watch
                (sh, "core", "# peers connected",
                 stat_iterator, peer));
  GNUNET_break (GNUNET_OK == GNUNET_STATISTICS_watch
                (sh, "nse", "# peers connected",
                 stat_iterator, peer));
}


static void
connect_nse_service ()
{
  struct NSEPeer *current_peer;
  unsigned int i;
  unsigned int connections;

  if (0 == connection_limit)
    return;
  LOG_DEBUG ("Connecting to nse service of peers\n");
  connections = 0;
  for (i = 0; i < num_peers_in_round[current_round]; i++)
  {
    if ((num_peers_in_round[current_round] > connection_limit) &&
        (0 != (i % (num_peers_in_round[current_round] / connection_limit))))
      continue;
    LOG_DEBUG ("Connecting to nse service of peer %d\n", i);
    current_peer = GNUNET_new (struct NSEPeer);
    current_peer->daemon = daemons[i];
    current_peer->nse_op
        = GNUNET_TESTBED_service_connect (NULL,
                                          current_peer->daemon,
                                          "nse",
                                          NULL, NULL,
                                          &nse_connect_adapter,
                                          &nse_disconnect_adapter,
                                          current_peer);
    if (NULL != data_file)
      current_peer->stat_op
          = GNUNET_TESTBED_service_connect (NULL,
                                            current_peer->daemon,
                                            "statistics",
                                            stat_comp_cb,
                                            current_peer,
                                            &stat_connect_adapter,
                                            &stat_disconnect_adapter,
                                            current_peer);
    GNUNET_CONTAINER_DLL_insert (peer_head, peer_tail, current_peer);
    if (++connections == connection_limit)
      break;
  }
}


static void
next_round (void *cls);


static void
finish_round (void *cls)
{
  LOG (GNUNET_ERROR_TYPE_INFO,
       "Have %u connections\n",
       total_connections);
  close_monitor_connections ();
  round_task = GNUNET_SCHEDULER_add_now (&next_round, NULL);
}


static void
run_round ()
{
  LOG_DEBUG ("Running round %u\n",
             current_round);
  connect_nse_service ();
  GNUNET_SCHEDULER_add_delayed (wait_time,
                                &finish_round,
                                NULL);
}


static struct OpListEntry *
make_oplist_entry ()
{
  struct OpListEntry *entry;

  entry = GNUNET_new (struct OpListEntry);
  GNUNET_CONTAINER_DLL_insert_tail (oplist_head,
                                    oplist_tail,
                                    entry);
  return entry;
}


static void
manage_service_cb (void *cls,
                   struct GNUNET_TESTBED_Operation *op,
                   const char *emsg)
{
  struct OpListEntry *entry = cls;

  GNUNET_TESTBED_operation_done (entry->op);
  if (NULL != emsg)
  {
    LOG (GNUNET_ERROR_TYPE_ERROR, "Failed to start/stop NSE at a peer\n");
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  GNUNET_assert (0 != entry->delta);
  peers_running += entry->delta;
  GNUNET_CONTAINER_DLL_remove (oplist_head,
                               oplist_tail,
                               entry);
  GNUNET_free (entry);
  if (num_peers_in_round[current_round] == peers_running)
    run_round ();
}


static void
adjust_running_peers ()
{
  struct OpListEntry *entry;
  unsigned int i;

  /* start peers if we have too few */
  for (i=peers_running;i<num_peers_in_round[current_round];i++)
  {
    entry = make_oplist_entry ();
    entry->delta = 1;
    entry->op = GNUNET_TESTBED_peer_manage_service (NULL,
                                                    daemons[i],
                                                    "nse",
                                                    &manage_service_cb,
                                                    entry,
                                                    1);
  }
  /* stop peers if we have too many */
  for (i=num_peers_in_round[current_round];i<peers_running;i++)
  {
    entry = make_oplist_entry ();
    entry->delta = -1;
    entry->op =  GNUNET_TESTBED_peer_manage_service (NULL,
                                                     daemons[i],
                                                     "nse",
                                                     &manage_service_cb,
                                                     entry,
                                                     0);
  }
}


static void
next_round (void *cls)
{
  round_task = NULL;
  LOG_DEBUG ("Disconnecting nse service of peers\n");
  current_round++;
  if (current_round == num_rounds)
  {
    /* this was the last round, terminate */
    ok = 0;
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  if (num_peers_in_round[current_round] == peers_running)
  {
    /* no need to churn, just run next round */
    run_round ();
    return;
  }
  adjust_running_peers ();
}


static void
master_controller_cb (void *cls,
                      const struct GNUNET_TESTBED_EventInformation *event)
{
  switch (event->type)
    {
    case GNUNET_TESTBED_ET_CONNECT:
      total_connections++;
      break;
    case GNUNET_TESTBED_ET_DISCONNECT:
      total_connections--;
      break;
    default:
      break;
    }
}


static void
test_master (void *cls,
             struct GNUNET_TESTBED_RunHandle *h,
             unsigned int num_peers_,
             struct GNUNET_TESTBED_Peer **peers,
             unsigned int links_succeeded,
             unsigned int links_failed)
{
  if (NULL == peers)
  {
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
  daemons = peers;
  GNUNET_break (num_peers_ == num_peers);
  peers_running = num_peers;
  if (num_peers_in_round[current_round] == peers_running)
  {
    /* no need to churn, just run the starting round */
    run_round ();
    return;
  }
  adjust_running_peers ();
}


static void
run (void *cls, char *const *args, const char *cfgfile,
     const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  char *tok;
  uint64_t event_mask;
  unsigned int num;

  ok = 1;
  testing_cfg = GNUNET_CONFIGURATION_dup (cfg);
  LOG_DEBUG ("Starting daemons.\n");
  if (NULL == num_peer_spec)
  {
    fprintf (stderr, "You need to specify the number of peers to run\n");
    return;
  }
  for (tok = strtok (num_peer_spec, ","); NULL != tok; tok = strtok (NULL, ","))
    {
      if (1 != sscanf (tok, "%u", &num))
        {
          fprintf (stderr, "You need to specify numbers, not `%s'\n", tok);
          return;
        }
      if (0 == num)
        {
          fprintf (stderr, "Refusing to run a round with 0 peers\n");
          return;
        }
      GNUNET_array_append (num_peers_in_round, num_rounds, num);
      num_peers = GNUNET_MAX (num_peers, num);
    }
  if (0 == num_peers)
    {
      fprintf (stderr, "Refusing to run a testbed with no rounds\n");
      return;
    }
  if ( (NULL != data_filename) &&
       (NULL == (data_file =
                 GNUNET_DISK_file_open (data_filename,
                                        GNUNET_DISK_OPEN_READWRITE |
                                        GNUNET_DISK_OPEN_TRUNCATE |
                                        GNUNET_DISK_OPEN_CREATE,
                                        GNUNET_DISK_PERM_USER_READ |
                                        GNUNET_DISK_PERM_USER_WRITE))) )
    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
                              "open",
                              data_filename);

  if ( (NULL != output_filename) &&
       (NULL == (output_file =
                 GNUNET_DISK_file_open (output_filename,
                                        GNUNET_DISK_OPEN_READWRITE |
                                        GNUNET_DISK_OPEN_CREATE,
                                        GNUNET_DISK_PERM_USER_READ |
                                        GNUNET_DISK_PERM_USER_WRITE))) )
    GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR, "open",
                              output_filename);
  event_mask = 0LL;
  event_mask |= (1LL << GNUNET_TESTBED_ET_PEER_START);
  event_mask |= (1LL << GNUNET_TESTBED_ET_PEER_STOP);
  event_mask |= (1LL << GNUNET_TESTBED_ET_CONNECT);
  event_mask |= (1LL << GNUNET_TESTBED_ET_DISCONNECT);
  GNUNET_TESTBED_run (hosts_file,
                      cfg,
                      num_peers,
                      event_mask,
                      master_controller_cb,
                      NULL,     /* master_controller_cb cls */
                      &test_master,
                      NULL);    /* test_master cls */
  GNUNET_SCHEDULER_add_shutdown (&shutdown_task, NULL);
}


int
main (int argc, char *const *argv)
{
  struct GNUNET_GETOPT_CommandLineOption options[] = {
    GNUNET_GETOPT_option_uint ('C',
                                   "connections",
                                   "COUNT",
                                   gettext_noop ("limit to the number of connections to NSE services, 0 for none"),
                                   &connection_limit),
    GNUNET_GETOPT_option_string ('d',
                                 "details",
                                 "FILENAME",
                                 gettext_noop ("name of the file for writing connection information and statistics"),
                                 &data_filename),

    GNUNET_GETOPT_option_string ('H',
                                 "hosts",
                                 "FILENAME",
                                 gettext_noop ("name of the file with the login information for the testbed"),
                                 &hosts_file),

    GNUNET_GETOPT_option_string ('o',
                                 "output",
                                 "FILENAME",
                                 gettext_noop ("name of the file for writing the main results"),
                                 &output_filename),


    GNUNET_GETOPT_option_string ('p',
                                 "peers",
                                 "NETWORKSIZESPEC",
                                 gettext_noop ("Number of peers to run in each round, separated by commas"),
                                 &num_peer_spec),

    GNUNET_GETOPT_option_increment_uint ('V',
                                          "verbose",
                                          gettext_noop ("be verbose (print progress information)"),
                                          &verbose),

    GNUNET_GETOPT_option_relative_time ('w',
                                            "wait",
                                            "DELAY",
                                            gettext_noop ("delay between rounds"),
                                            &wait_time),
    GNUNET_GETOPT_OPTION_END
  };
  if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
    return 2;
  if (GNUNET_OK !=
      GNUNET_PROGRAM_run (argc, argv, "nse-profiler",
                          gettext_noop
                          ("Measure quality and performance of the NSE service."),
                          options, &run, NULL))
    ok = 1;
  return ok;
}

/* end of nse-profiler.c */