gnunet/src/ats/gnunet-ats-solver-eval.c

/*
 This file is part of GNUnet.
 Copyright (C) 2010-2013 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 ats-tests/ats-testing-experiment.c
 * @brief ats benchmark: controlled experiment execution
 * @author Christian Grothoff
 * @author Matthias Wachs
 */
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet-ats-solver-eval.h"
#include "gnunet-service-ats_normalization.h"
#include "gnunet-service-ats_preferences.c"

#define BIG_M_STRING "unlimited"

/**
 * Handle for statistics.
 */
struct GNUNET_STATISTICS_Handle *GSA_stats;


static struct Experiment *e;

static struct LoggingHandle *l;

static struct SolverHandle *sh;

static struct TestPeer *peer_head;

static struct TestPeer *peer_tail;

static double default_properties[GNUNET_ATS_PropertyCount];
static double default_preferences[GNUNET_ATS_PreferenceCount];

/**
 * cmd option -e: experiment file
 */
static char *opt_exp_file;

static char *opt_solver;

/**
 * cmd option -l: enable logging
 */
static int opt_log;

/**
 * cmd option -p: enable plots
 */
static int opt_save;

/**
 * cmd option -v: verbose logs
 */
static int opt_verbose;

/**
 * cmd option -p: print logs
 */
static int opt_print;

/**
 * cmd option -d: disable normalization
 */
static int opt_disable_normalization;

static int res;

static void
end_now ();


static char *
print_generator_type (enum GeneratorType g)
{
  switch (g) {
    case GNUNET_ATS_TEST_TG_CONSTANT:
      return "CONSTANT";
    case GNUNET_ATS_TEST_TG_LINEAR:
      return "LINEAR";
    case GNUNET_ATS_TEST_TG_RANDOM:
      return "RANDOM";
    case GNUNET_ATS_TEST_TG_SINUS:
      return "SINUS";
    default:
      return "INVALID";
      break;
  }
}


static struct TestPeer *
find_peer_by_id (int id)
{
  struct TestPeer *cur;
  for (cur = peer_head; NULL != cur; cur = cur->next)
    if (cur->id == id)
      return cur;
  return NULL;
}

static struct TestPeer *
find_peer_by_pid (const struct GNUNET_PeerIdentity *pid)
{
  struct TestPeer *cur;
  for (cur = peer_head; NULL != cur; cur = cur->next)
    if (0 == memcmp (&cur->peer_id, pid, sizeof (struct GNUNET_PeerIdentity)))
      return cur;
  return NULL;
}

static struct TestAddress *
find_address_by_id (struct TestPeer *peer, int aid)
{
  struct TestAddress *cur;
  for (cur = peer->addr_head; NULL != cur; cur = cur->next)
    if (cur->aid == aid)
      return cur;
  return NULL;
}


/**
 * Logging
 */
void
GNUNET_ATS_solver_logging_now (struct LoggingHandle *l)
{
  struct LoggingTimeStep *lts;
  struct TestPeer *cur;
  struct TestAddress *cur_addr;
  struct LoggingPeer *log_p;
  struct LoggingAddress *log_a;
  int c;

  lts = GNUNET_new (struct LoggingTimeStep);
  GNUNET_CONTAINER_DLL_insert_tail(l->head, l->tail, lts);
  lts->timestamp = GNUNET_TIME_absolute_get();
  if (NULL == lts->prev)
    lts->delta = GNUNET_TIME_UNIT_ZERO;
  else
    lts->delta = GNUNET_TIME_absolute_get_duration(lts->prev->timestamp);

  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Logging %llu, delta %llu\n",
      lts->timestamp.abs_value_us, lts->delta.rel_value_us);


  /* Store logging data here */
  for (cur = peer_head; NULL != cur; cur = cur->next)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Logging peer id %llu\n", cur->id);

    log_p = GNUNET_new (struct LoggingPeer);
    log_p->id = cur->id;
    log_p->peer_id = cur->peer_id;
    log_p->is_requested = cur->is_requested;
    for (c = 0; c < GNUNET_ATS_PreferenceCount; c++)
    {
      log_p->pref_abs[c] = cur->pref_abs[c];
      log_p->pref_norm[c] = cur->pref_norm[c];
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "\t %s = %.2f %.2f [abs/rel]\n",
                  GNUNET_ATS_print_preference_type(c),
                  log_p->pref_abs[c], log_p->pref_norm[c]);
    }
    GNUNET_CONTAINER_DLL_insert_tail(lts->head, lts->tail, log_p);

    for (cur_addr = cur->addr_head; NULL != cur_addr; cur_addr = cur_addr->next)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                  "Logging peer id %llu address %llu\n",
                  cur->id, cur_addr->aid);
      log_a = GNUNET_new (struct LoggingAddress);
      log_a->aid = cur_addr->aid;
      log_a->active = cur_addr->ats_addr->active;
      log_a->network = cur_addr->network;
      log_a->assigned_bw_in = cur_addr->ats_addr->assigned_bw_in;
      log_a->assigned_bw_out = cur_addr->ats_addr->assigned_bw_out;
      for (c = 0; c < GNUNET_ATS_PropertyCount; c++)
      {
        log_a->prop_abs[c] = cur_addr->prop_abs[c];
        log_a->prop_norm[c] = cur_addr->prop_norm[c];
        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                    "\t %s = %.2f %.2f [abs/rel]\n",
                    GNUNET_ATS_print_property_type(c),
                    log_a->prop_abs[c],
                    log_a->prop_norm[c]);
      }
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\t Active = %i\n", log_a->active);
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\t BW in = %llu\n", log_a->assigned_bw_in);
      GNUNET_log (GNUNET_ERROR_TYPE_INFO, "\t BW out = %llu\n", log_a->assigned_bw_out);

      GNUNET_CONTAINER_DLL_insert_tail (log_p->addr_head, log_p->addr_tail, log_a);
    }
  }
}


static void
logging_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct LoggingHandle *l = cls;

  l->logging_task = NULL;
  GNUNET_ATS_solver_logging_now (l);
  l->logging_task = GNUNET_SCHEDULER_add_delayed (l->log_freq,
                                                  &logging_task,
                                                  l);
}

struct LoggingHandle *
GNUNET_ATS_solver_logging_start (struct GNUNET_TIME_Relative freq)
{
  struct LoggingHandle *l;
  l = GNUNET_new (struct LoggingHandle);

  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Start logging every  %s\n",
      GNUNET_STRINGS_relative_time_to_string(freq, GNUNET_NO));
  l->log_freq = freq;
  l->logging_task = GNUNET_SCHEDULER_add_now (&logging_task, l);
  return l;
}

void
GNUNET_ATS_solver_logging_stop (struct LoggingHandle *l)
{
  if (NULL != l->logging_task)
    GNUNET_SCHEDULER_cancel (l->logging_task);

  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Stop logging\n");

  l->logging_task = NULL;
}

static struct LoggingFileHandle *
find_logging_file_handle (struct LoggingFileHandle *lf_head,
    struct LoggingFileHandle *lf_tail,
    int peer_id, int address_id)
{
  struct LoggingFileHandle *res;

  for (res = lf_head; NULL != res; res = res->next)
    if ((res->pid == peer_id) && (res->aid == address_id))
      return res;
  return NULL;

}

void
GNUNET_ATS_solver_logging_write_to_disk (struct LoggingHandle *l, int add_time_stamp,
    char *output_dir)
{
  struct LoggingTimeStep *lts;
  struct LoggingPeer *log_p;
  struct LoggingAddress *log_a;
  struct LoggingFileHandle *lf_head;
  struct LoggingFileHandle *lf_tail;
  struct LoggingFileHandle *cur;
  struct LoggingFileHandle *next;
  char * filename;
  char * datastring;
  char * propstring;
  char * propstring_tmp;
  char * prefstring;
  char * prefstring_tmp;
  int c;
  int use_dir;

  use_dir = GNUNET_NO;
  if (NULL != output_dir)
  {
    if (GNUNET_OK != GNUNET_DISK_directory_create_for_file (output_dir))
    {
      fprintf (stderr, "Failed to create directory `%s'\n", output_dir);
      return;
    }
    else
    {
      fprintf (stderr, "Created directory `%s'\n", output_dir);
      use_dir = GNUNET_YES;
    }
  }

  lf_head = NULL;
  lf_tail = NULL;

  for (lts = l->head; NULL != lts; lts = lts->next)
  {

    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Writing log step %llu\n",
        (long long unsigned int) lts->timestamp.abs_value_us);

    for (log_p = lts->head; NULL != log_p; log_p = log_p->next)
    {
      for (log_a = log_p->addr_head; NULL != log_a; log_a = log_a->next)
      {

        cur = find_logging_file_handle (lf_head, lf_tail, log_p->id,
            log_a->aid);
        if (NULL == cur)
        {
          cur = GNUNET_new (struct LoggingFileHandle);
          cur->aid = log_a->aid;
          cur->pid = log_p->id;

          if (GNUNET_YES == add_time_stamp)
            GNUNET_asprintf (&filename, "%s%s%s_%s_p%u_a%u_%llu.log",
                (GNUNET_YES == use_dir) ? output_dir : "",
                (GNUNET_YES == use_dir) ? DIR_SEPARATOR_STR : "",
                e->log_prefix,
                opt_solver,
                cur->pid,
                cur->aid,
                l->head->timestamp.abs_value_us);
          else
            GNUNET_asprintf (&filename, "%s%s%s_%s_p%u_a%u.log",
                (GNUNET_YES == use_dir) ? output_dir : "",
                (GNUNET_YES == use_dir) ? DIR_SEPARATOR_STR : "",
                e->log_prefix,
                opt_solver,
                cur->pid,
                cur->aid);

          fprintf (stderr, "Add writing log data for peer %llu address %llu to file `%s'\n",
              cur->pid, cur->aid, filename);


          cur->f_hd = GNUNET_DISK_file_open (filename,
              GNUNET_DISK_OPEN_READWRITE |
              GNUNET_DISK_OPEN_CREATE |
              GNUNET_DISK_OPEN_TRUNCATE,
              GNUNET_DISK_PERM_USER_READ |
              GNUNET_DISK_PERM_USER_WRITE |
              GNUNET_DISK_PERM_GROUP_READ |
              GNUNET_DISK_PERM_OTHER_READ);
          if (NULL == cur->f_hd)
          {
            fprintf (stderr, "Cannot open `%s' to write log data!\n", filename);
            GNUNET_free (filename);
            GNUNET_free (cur);
            goto cleanup;
          }
          GNUNET_free (filename);
          GNUNET_CONTAINER_DLL_insert (lf_head, lf_tail, cur);

          GNUNET_asprintf(&datastring,"#time delta;log duration;peer_requested;addr net; addr_active; bw in; bw out; " \
              "UTILIZATION_UP [abs/rel]; UTILIZATION_UP; UTILIZATION_DOWN; UTILIZATION_DOWN; " \
              "UTILIZATION_PAYLOAD_UP; UTILIZATION_PAYLOAD_UP; UTILIZATION_PAYLOAD_DOWN; UTILIZATION_PAYLOAD_DOWN;"\
              "DELAY; DELAY; " \
              "DISTANCE ;DISTANCE ; COST_WAN; COST_WAN; COST_LAN; COST_LAN; " \
              "COST_WLAN; COST_WLAN;COST_BT; COST_BT; PREF BW abs; PREF BW rel; PREF LATENCY abs; PREF LATENCY rel;\n");
          GNUNET_DISK_file_write (cur->f_hd, datastring, strlen(datastring));
          GNUNET_free (datastring);

        }

        prefstring = GNUNET_strdup("");
        for (c = 1; c < GNUNET_ATS_PreferenceCount; c++)
        {
          /*
          fprintf(stderr,"\t %s = %.2f %.2f [abs/rel]\n",
              GNUNET_ATS_print_preference_type(c),
              log_p->pref_abs[c], log_p->pref_norm[c]);
           */
          GNUNET_asprintf(&prefstring_tmp,"%s;%.3f;%.3f",
              prefstring, log_p->pref_abs[c], log_p->pref_norm[c]);


          GNUNET_free (prefstring);
          prefstring = GNUNET_strdup(prefstring_tmp);
          GNUNET_free (prefstring_tmp);
        }


        propstring = GNUNET_strdup("");
        for (c = 1; c < GNUNET_ATS_PropertyCount; c++)
        {
          if (GNUNET_ATS_NETWORK_TYPE == c)
            continue;
          /*
          fprintf(stderr, "\t %s = %.2f %.2f [abs/rel]\n",
              GNUNET_ATS_print_property_type(c),
              log_a->prop_abs[c], log_a->prop_norm[c]);*/
          GNUNET_asprintf(&propstring_tmp,"%s%.3f;%.3f;",
                          propstring,
                          log_a->prop_abs[c],
                          log_a->prop_norm[c]);
          GNUNET_free (propstring);
          propstring = GNUNET_strdup(propstring_tmp);
          GNUNET_free (propstring_tmp);
        }
        GNUNET_asprintf (&datastring, "%llu;%llu;%u;%u;%i;%u;%u;%s;%s\n",
            GNUNET_TIME_absolute_get_difference (l->head->timestamp,
                lts->timestamp).rel_value_us / 1000, lts->delta,
            log_p->is_requested, log_a->network, log_a->active,
            log_a->assigned_bw_in, log_a->assigned_bw_out, propstring,
            prefstring);

        GNUNET_DISK_file_write (cur->f_hd, datastring, strlen(datastring));
        GNUNET_free (datastring);
        GNUNET_free (prefstring);
        GNUNET_free (propstring);
      }
    }
  }

cleanup:
  next = lf_head;
  for (cur = next; NULL != cur; cur = next)
  {
    next = cur->next;
    GNUNET_CONTAINER_DLL_remove (lf_head, lf_tail, cur);
    if (NULL != cur->f_hd)
      GNUNET_DISK_file_close (cur->f_hd);
    GNUNET_free (cur);
  }

}

void
GNUNET_ATS_solver_logging_eval (struct LoggingHandle *l)
{
  struct LoggingTimeStep *lts;
  struct LoggingPeer *log_p;
  struct LoggingAddress *log_a;
  int c;

  for (lts = l->head; NULL != lts; lts = lts->next)
  {
    fprintf (stderr, "Log step %llu %llu: \n",
        (long long unsigned int) lts->timestamp.abs_value_us,
        (long long unsigned int) lts->delta.rel_value_us);

    for (log_p = lts->head; NULL != log_p; log_p = log_p->next)
    {
      fprintf (stderr,"\tLogging peer pid %llu\n", log_p->id);
      for (c = 1; c < GNUNET_ATS_PreferenceCount; c++)
      {
        fprintf(stderr,"\t %s = %.2f %.2f [abs/rel]\n",
            GNUNET_ATS_print_preference_type(c),
            log_p->pref_abs[c], log_p->pref_norm[c]);
      }

      for (log_a = log_p->addr_head; NULL != log_a; log_a = log_a->next)
      {
        fprintf (stderr, "\tPeer pid %llu address %llu: %u %u %u\n",
            log_p->id, log_a->aid, log_a->active,
            log_a->assigned_bw_in,
            log_a->assigned_bw_out);

        for (c = 1; c < GNUNET_ATS_PropertyCount; c++)
        {
          if (GNUNET_ATS_NETWORK_TYPE == c)
            continue;
          fprintf(stderr, "\t %s = %.2f %.2f [abs/rel]\n",
              GNUNET_ATS_print_property_type(c),
              log_a->prop_abs[c], log_a->prop_norm[c]);
        }
      }
    }
  }
}

void
GNUNET_ATS_solver_logging_free (struct LoggingHandle *l)
{
  struct LoggingTimeStep *lts_cur;
  struct LoggingTimeStep *lts_next;
  struct LoggingPeer *log_p_cur;
  struct LoggingPeer *log_p_next;
  struct LoggingAddress *log_a_cur;
  struct LoggingAddress *log_a_next;

  if (NULL != l->logging_task)
    GNUNET_SCHEDULER_cancel (l->logging_task);
  l->logging_task = NULL;

  lts_next = l->head;
  while (NULL != (lts_cur = lts_next))
  {
    lts_next = lts_cur->next;

    log_p_next = lts_cur->head;
    while (NULL != (log_p_cur = log_p_next))
    {
      log_p_next = log_p_cur->next;

      log_a_next = log_p_cur->addr_head;
      while (NULL != (log_a_cur = log_a_next))
      {
        log_a_next = log_a_cur->next;

        GNUNET_CONTAINER_DLL_remove (log_p_cur->addr_head, log_p_cur->addr_tail, log_a_cur);
        GNUNET_free (log_a_cur);
      }

      GNUNET_CONTAINER_DLL_remove (lts_cur->head, lts_cur->tail, log_p_cur);
      GNUNET_free (log_p_cur);
    }

    GNUNET_CONTAINER_DLL_remove (l->head, l->tail, lts_cur);
    GNUNET_free (lts_cur);
  }

  GNUNET_free (l);
}

/**
 * Property Generators
 */
static struct PropertyGenerator *prop_gen_head;
static struct PropertyGenerator *prop_gen_tail;


static double
get_property (struct PropertyGenerator *pg)
{
  struct GNUNET_TIME_Relative time_delta;
  double delta_value;
  double pref_value;

  /* Calculate the current preference value */
  switch (pg->type) {
    case GNUNET_ATS_TEST_TG_CONSTANT:
      pref_value = pg->base_value;
      break;
    case GNUNET_ATS_TEST_TG_LINEAR:
      time_delta = GNUNET_TIME_absolute_get_duration(pg->time_start);
      /* Calculate point of time in the current period */
      time_delta.rel_value_us = time_delta.rel_value_us %
          pg->duration_period.rel_value_us;
      delta_value = ((double) time_delta.rel_value_us  /
          pg->duration_period.rel_value_us) * (pg->max_value - pg->base_value);
      if ((pg->max_value < pg->base_value) &&
          ((pg->max_value - pg->base_value) > pg->base_value))
      {
        /* This will cause an underflow */
        GNUNET_break (0);
      }
      pref_value = pg->base_value + delta_value;
      break;
    case GNUNET_ATS_TEST_TG_RANDOM:
      delta_value =  (double) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
          10000 * (pg->max_value - pg->base_value)) / 10000;
      pref_value = pg->base_value + delta_value;
      break;
    case GNUNET_ATS_TEST_TG_SINUS:
      time_delta = GNUNET_TIME_absolute_get_duration(pg->time_start);
      /* Calculate point of time in the current period */
      time_delta.rel_value_us = time_delta.rel_value_us %
          pg->duration_period.rel_value_us;
      if ((pg->max_value - pg->base_value) > pg->base_value)
      {
        /* This will cause an underflow for second half of sinus period,
         * will be detected in general when experiments are loaded */
        GNUNET_break (0);
      }
      delta_value = (pg->max_value - pg->base_value) *
          sin ( (2 * M_PI) / ((double) pg->duration_period.rel_value_us) *
              time_delta.rel_value_us);
      pref_value = pg->base_value + delta_value;
      break;
    default:
      pref_value = 0.0;
      break;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Current property value is %f\n",
      pref_value);
  return pref_value;
}


static void
set_prop_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct PropertyGenerator *pg = cls;
  struct TestPeer *p;
  struct TestAddress *a;
  double prop_value;
  struct GNUNET_ATS_Information atsi;

  pg->set_task = NULL;

  if (GNUNET_NO == GNUNET_CONTAINER_multipeermap_contains_value (sh->addresses,
      &pg->test_peer->peer_id, pg->test_address->ats_addr))
  {
    GNUNET_break (0);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
        "Setting property generation for unknown address [%u:%u]\n",
        pg->peer, pg->address_id);
    return;
  }
  if (NULL == (p = find_peer_by_id (pg->peer)))
  {
    GNUNET_break (0);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
        "Setting property generation for unknown peer %u\n",
        pg->peer);
    return;
  }
  if (NULL == (a = find_address_by_id (p, pg->address_id)))
  {
    GNUNET_break (0);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
        "Setting property generation for unknown peer %u\n",
        pg->peer);
    return;
  }

  prop_value = get_property (pg);
  a->prop_abs[pg->ats_property] = prop_value;

  GNUNET_log(GNUNET_ERROR_TYPE_INFO,
      "Setting property for peer [%u] address [%u] for %s to %f\n",
      pg->peer, pg->address_id,
      GNUNET_ATS_print_property_type (pg->ats_property), prop_value);

  atsi.type = htonl (pg->ats_property);
  atsi.value = htonl ((uint32_t) prop_value);

  /* set performance here! */
  sh->sf->s_bulk_start (sh->sf->cls);
  if (GNUNET_YES == opt_disable_normalization)
  {
    a->prop_abs[pg->ats_property] = prop_value;
    a->prop_norm[pg->ats_property] = prop_value;
    sh->sf->s_address_update_property (sh->sf->cls, a->ats_addr,
        pg->ats_property, prop_value, prop_value);
  }
  else
    GAS_normalization_update_property (pg->test_address->ats_addr, &atsi, 1);
  sh->sf->s_bulk_stop (sh->sf->cls);

  pg->set_task = GNUNET_SCHEDULER_add_delayed (pg->frequency,
      &set_prop_task, pg);
}


/**
 * Set ats_property to 0 to find all pgs
 */
static struct PropertyGenerator *
find_prop_gen (unsigned int peer, unsigned int address,
    uint32_t ats_property)
{
  struct PropertyGenerator *cur;
  for (cur = prop_gen_head; NULL != cur; cur = cur->next)
    if ((cur->peer == peer) && (cur->address_id == address))
    {
      if ((cur->ats_property == ats_property) || (0 == ats_property))
        return cur;
    }
  return NULL;
}

void
GNUNET_ATS_solver_generate_property_stop (struct PropertyGenerator *pg)
{
  GNUNET_CONTAINER_DLL_remove (prop_gen_head, prop_gen_tail, pg);

  if (NULL != pg->set_task)
  {
    GNUNET_SCHEDULER_cancel (pg->set_task);
    pg->set_task = NULL;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
      "Removing old up preference generator peer [%u] address [%u] `%s'\n",
      pg->peer, pg->address_id,
      GNUNET_ATS_print_property_type(pg->ats_property));

  GNUNET_free (pg);
}


/**
 * Generate between the source master and the partner and set property with a
 * value depending on the generator.
 *
 * @param peer source
 * @param address_id partner
 * @param test_peer the peer
 * @param test_address the address
 * @param type type of generator
 * @param base_value base value
 * @param value_rate maximum value
 * @param period duration of a period of generation (~ 1/frequency)
 * @param frequency how long to generate property
 * @param ats_property ATS property to generate
 * @return the property generator
 */
struct PropertyGenerator *
GNUNET_ATS_solver_generate_property_start (unsigned int peer,
    unsigned int address_id,
    struct TestPeer *test_peer,
    struct TestAddress *test_address,
    enum GeneratorType type,
    long int base_value,
    long int value_rate,
    struct GNUNET_TIME_Relative period,
    struct GNUNET_TIME_Relative frequency,
    uint32_t ats_property)
{
  struct PropertyGenerator *pg;

  pg = GNUNET_new (struct PropertyGenerator);
  GNUNET_CONTAINER_DLL_insert (prop_gen_head, prop_gen_tail, pg);
  pg->type = type;
  pg->peer = peer;
  pg->test_address = test_address;
  pg->test_peer = test_peer;
  pg->address_id = address_id;
  pg->ats_property = ats_property;
  pg->base_value = base_value;
  pg->max_value = value_rate;
  pg->duration_period = period;
  pg->frequency = frequency;
  pg->time_start = GNUNET_TIME_absolute_get();

  switch (type) {
    case GNUNET_ATS_TEST_TG_CONSTANT:
      GNUNET_log (GNUNET_ERROR_TYPE_INFO,
          "Setting up %s property generator peer [%u] address [%u] `%s'"\
          "max %u Bips\n",
          print_generator_type(type), pg->peer, pg->address_id,
          GNUNET_ATS_print_property_type (ats_property),
          base_value);
      break;
    case GNUNET_ATS_TEST_TG_LINEAR:
      GNUNET_log (GNUNET_ERROR_TYPE_INFO,
          "Setting up %s property generator peer [%u] address [%u] `%s' " \
          "min %u Bips max %u Bips\n",
          print_generator_type(type), pg->peer, pg->address_id,
          GNUNET_ATS_print_property_type(ats_property),
          base_value, value_rate);
      break;
    case GNUNET_ATS_TEST_TG_SINUS:
      GNUNET_log (GNUNET_ERROR_TYPE_INFO,
          "Setting up %s property generator peer [%u] address [%u] `%s' "\
          "baserate %u Bips, amplitude %u Bps\n",
          print_generator_type(type), pg->peer, pg->address_id,
          GNUNET_ATS_print_property_type(ats_property),
          base_value, value_rate);
      break;
    case GNUNET_ATS_TEST_TG_RANDOM:
      GNUNET_log (GNUNET_ERROR_TYPE_INFO,
          "Setting up %s property generator peer [%u] address [%u] `%s' "\
          "min %u Bips max %u Bps\n",
          print_generator_type(type), pg->peer, pg->address_id,
          GNUNET_ATS_print_property_type(ats_property),
          base_value, value_rate);
      break;
    default:
      break;
  }

  pg->set_task = GNUNET_SCHEDULER_add_now (&set_prop_task, pg);
  return pg;
}


/**
 * Stop all preferences generators
 */
void
GNUNET_ATS_solver_generate_property_stop_all ()
{
  struct PropertyGenerator *cur;
  struct PropertyGenerator *next;
  next = prop_gen_head;
  for (cur = next; NULL != cur; cur = next)
  {
      next = cur->next;
      GNUNET_ATS_solver_generate_property_stop (cur);
  }
}


/**
 * Preference Generators
 */
static struct PreferenceGenerator *pref_gen_head;
static struct PreferenceGenerator *pref_gen_tail;


static double
get_preference (struct PreferenceGenerator *pg)
{
  struct GNUNET_TIME_Relative time_delta;
  double delta_value;
  double pref_value;

  /* Calculate the current preference value */
  switch (pg->type) {
    case GNUNET_ATS_TEST_TG_CONSTANT:
      pref_value = pg->base_value;
      break;
    case GNUNET_ATS_TEST_TG_LINEAR:
      time_delta = GNUNET_TIME_absolute_get_duration(pg->time_start);
      /* Calculate point of time in the current period */
      time_delta.rel_value_us = time_delta.rel_value_us %
          pg->duration_period.rel_value_us;
      delta_value = ((double) time_delta.rel_value_us  /
          pg->duration_period.rel_value_us) * (pg->max_value - pg->base_value);
      if ((pg->max_value < pg->base_value) &&
          ((pg->max_value - pg->base_value) > pg->base_value))
      {
        /* This will cause an underflow */
        GNUNET_break (0);
      }
      pref_value = pg->base_value + delta_value;
      break;
    case GNUNET_ATS_TEST_TG_RANDOM:
      delta_value =  (double) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
          10000 * (pg->max_value - pg->base_value)) / 10000;
      pref_value = pg->base_value + delta_value;
      break;
    case GNUNET_ATS_TEST_TG_SINUS:
      time_delta = GNUNET_TIME_absolute_get_duration(pg->time_start);
      /* Calculate point of time in the current period */
      time_delta.rel_value_us = time_delta.rel_value_us %
          pg->duration_period.rel_value_us;
      if ((pg->max_value - pg->base_value) > pg->base_value)
      {
        /* This will cause an underflow for second half of sinus period,
         * will be detected in general when experiments are loaded */
        GNUNET_break (0);
      }
      delta_value = (pg->max_value - pg->base_value) *
          sin ( (2 * M_PI) / ((double) pg->duration_period.rel_value_us) *
              time_delta.rel_value_us);
      pref_value = pg->base_value + delta_value;
      break;
    default:
      pref_value = 0.0;
      break;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Current preference value is %f\n",
      pref_value);
  return pref_value;
}

static void
set_feedback_task (void *cls,
                    const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct PreferenceGenerator *pg = cls;
  struct TestPeer *p;
  double feedback;
  uint32_t bw_acc_out;
  uint32_t bw_acc_in;
  uint32_t delay_acc_in;
  struct GNUNET_TIME_Relative dur;
  double p_new;

  pg->feedback_task = NULL;

  if (NULL == (p = find_peer_by_id (pg->peer)))
  {
    GNUNET_break (0);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
        "Setting feedback for unknown peer %u\n", pg->peer);
    return;
  }

  switch (pg->kind)
  {
    case GNUNET_ATS_PREFERENCE_BANDWIDTH:
      dur = GNUNET_TIME_absolute_get_duration(pg->feedback_last_bw_update);
      bw_acc_in = dur.rel_value_us *pg->last_assigned_bw_in +  pg->feedback_bw_in_acc;
      pg->feedback_bw_in_acc = 0;

      bw_acc_out = dur.rel_value_us *pg->last_assigned_bw_out +  pg->feedback_bw_out_acc;
      p_new = get_preference (pg);
      feedback  = (p_new / pg->pref_bw_old) * (bw_acc_in + bw_acc_out) /
          (2 *GNUNET_TIME_absolute_get_duration(pg->feedback_last).rel_value_us);

      break;
    case GNUNET_ATS_PREFERENCE_LATENCY:
      dur = GNUNET_TIME_absolute_get_duration(pg->feedback_last_delay_update);
      delay_acc_in =dur.rel_value_us *pg->last_delay_value +  pg->feedback_delay_acc;
      pg->feedback_delay_acc = 0;

      p_new = get_preference (pg);
      feedback  = (p_new / pg->pref_latency_old) * (delay_acc_in) /
          (GNUNET_TIME_absolute_get_duration(pg->feedback_last).rel_value_us);

      break;
    default:
      GNUNET_break (0);
      feedback = 0.0;
      break;
  }
  GNUNET_log(GNUNET_ERROR_TYPE_INFO,
      "Giving feedback for peer [%u] for client %p pref %s of %.3f\n",
      pg->peer, NULL + (pg->client_id),
      GNUNET_ATS_print_preference_type (pg->kind),
      feedback);

  sh->sf->s_feedback (sh->sf->cls, NULL + (pg->client_id), &p->peer_id,
      pg->feedback_frequency, pg->kind, feedback);
  pg->feedback_last = GNUNET_TIME_absolute_get();


  pg->feedback_bw_out_acc = 0;
  pg->feedback_bw_in_acc = 0;
  pg->feedback_last_bw_update = GNUNET_TIME_absolute_get();

  pg->feedback_delay_acc = 0;
  pg->feedback_last_delay_update = GNUNET_TIME_absolute_get();


  pg->feedback_task = GNUNET_SCHEDULER_add_delayed (pg->feedback_frequency,
      &set_feedback_task, pg);
}


static void
set_pref_task (void *cls,
               const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct PreferenceGenerator *pg = cls;
  struct TestPeer *p;
  double pref_value;
  pg->set_task = NULL;

  if (NULL == (p = find_peer_by_id (pg->peer)))
  {
    GNUNET_break (0);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
        "Setting preference for unknown peer %u\n", pg->peer);
    return;
  }

  pref_value = get_preference (pg);
  switch (pg->kind) {
    case GNUNET_ATS_PREFERENCE_BANDWIDTH:
      pg->pref_bw_old = pref_value;
      break;
    case GNUNET_ATS_PREFERENCE_LATENCY:
      pg->pref_latency_old = pref_value;
      break;
    default:
      break;
  }

  p->pref_abs[pg->kind] = pref_value;

  GNUNET_log(GNUNET_ERROR_TYPE_INFO,
      "Setting preference for peer [%u] for client %p pref %s to %f\n",
      pg->peer, NULL + (pg->client_id),
      GNUNET_ATS_print_preference_type (pg->kind), pref_value);

  if (GNUNET_YES == opt_disable_normalization)
  {
    p->pref_abs[pg->kind] = pref_value;
    p->pref_norm[pg->kind] = pref_value;
    sh->sf->s_pref (sh->sf->cls, &p->peer_id, pg->kind, pref_value);
  }
  else
    update_preference (NULL + (pg->client_id),
                       &p->peer_id,
                       pg->kind,
                       pref_value);

  pg->set_task = GNUNET_SCHEDULER_add_delayed (pg->frequency,
                                               &set_pref_task,
                                               pg);
}


static struct PreferenceGenerator *
find_pref_gen (unsigned int peer, enum GNUNET_ATS_PreferenceKind kind)
{
  struct PreferenceGenerator *cur;
  for (cur = pref_gen_head; NULL != cur; cur = cur->next)
    if (cur->peer == peer)
    {
      if ((cur->kind == kind) || (GNUNET_ATS_PREFERENCE_END == kind))
        return cur;
    }
  return NULL;
}

void
GNUNET_ATS_solver_generate_preferences_stop (struct PreferenceGenerator *pg)
{
  GNUNET_CONTAINER_DLL_remove (pref_gen_head, pref_gen_tail, pg);

  if (NULL != pg->feedback_task)
  {
    GNUNET_SCHEDULER_cancel (pg->feedback_task);
    pg->feedback_task = NULL;
  }

  if (NULL != pg->set_task)
  {
    GNUNET_SCHEDULER_cancel (pg->set_task);
    pg->set_task = NULL;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
      "Removing old up preference generator peer [%u] `%s'\n",
      pg->peer, GNUNET_ATS_print_preference_type(pg->kind));

  GNUNET_free (pg);
}


static struct TestAddress*
find_active_address (struct TestPeer *p)
{
  struct TestAddress *cur;
  for (cur = p->addr_head; NULL != cur; cur = cur->next)
    if (GNUNET_YES == cur->ats_addr->active)
      return cur;
  return NULL;
}


/**
 * Generate between the source master and the partner and set property with a
 * value depending on the generator.
 *
 * @param peer source
 * @param address_id partner
 * @param client_id the client
 * @param type type of generator
 * @param base_value base value
 * @param value_rate maximum value
 * @param period duration of a period of generation (~ 1/frequency)
 * @param frequency how long to generate property
 * @param kind ATS preference to generate
 * @param feedback_frequency how often to give feedback
 * @return the preference generator
 */
struct PreferenceGenerator *
GNUNET_ATS_solver_generate_preferences_start (unsigned int peer,
    unsigned int address_id,
    unsigned int client_id,
    enum GeneratorType type,
    long int base_value,
    long int value_rate,
    struct GNUNET_TIME_Relative period,
    struct GNUNET_TIME_Relative frequency,
    enum GNUNET_ATS_PreferenceKind kind,
    struct GNUNET_TIME_Relative feedback_frequency)
{
  struct PreferenceGenerator *pg;
  struct TestPeer *p;

  if (NULL == (p = find_peer_by_id (peer)))
  {
    GNUNET_break (0);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
        "Starting preference for unknown peer %u\n", peer);
    return NULL;
  }

  pg = GNUNET_new (struct PreferenceGenerator);
  GNUNET_CONTAINER_DLL_insert (pref_gen_head, pref_gen_tail, pg);
  pg->type = type;
  pg->peer = peer;
  pg->client_id = client_id;
  pg->kind = kind;
  pg->base_value = base_value;
  pg->max_value = value_rate;
  pg->duration_period = period;
  pg->frequency = frequency;
  pg->time_start = GNUNET_TIME_absolute_get();
  pg->feedback_frequency = feedback_frequency;

  switch (type) {
    case GNUNET_ATS_TEST_TG_CONSTANT:
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
          "Setting up %s preference generator peer [%u] `%s' max %u Bips\n",
          print_generator_type (type), pg->peer,
          GNUNET_ATS_print_preference_type(kind),
          base_value);
      break;
    case GNUNET_ATS_TEST_TG_LINEAR:
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
          "Setting up %s preference generator peer [%u] `%s' min %u Bips max %u Bips\n",
          print_generator_type (type), pg->peer, GNUNET_ATS_print_preference_type(kind),
          base_value, value_rate);
      break;
    case GNUNET_ATS_TEST_TG_SINUS:
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
          "Setting up %s preference generator peer [%u] `%s' baserate %u Bips, amplitude %u Bps\n",
          print_generator_type (type), pg->peer, GNUNET_ATS_print_preference_type(kind),
          base_value, value_rate);
      break;
    case GNUNET_ATS_TEST_TG_RANDOM:
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
          "Setting up %s preference generator peer [%u] `%s' min %u Bips max %u Bps\n",
          print_generator_type (type), pg->peer, GNUNET_ATS_print_preference_type(kind),
          base_value, value_rate);
      break;
    default:
      break;
  }

  pg->set_task = GNUNET_SCHEDULER_add_now (&set_pref_task, pg);
  if (GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us != feedback_frequency.rel_value_us)
  {
    struct TestAddress * addr = find_active_address(p);

    pg->last_assigned_bw_in = p->assigned_bw_in;
    pg->last_assigned_bw_out = p->assigned_bw_out;
    pg->feedback_bw_in_acc = 0;
    pg->feedback_bw_out_acc = 0;
    pg->last_delay_value = addr->prop_norm[GNUNET_ATS_QUALITY_NET_DELAY];
    pg->feedback_delay_acc = 0;

    pg->feedback_last_bw_update = GNUNET_TIME_absolute_get();
    pg->feedback_last_delay_update = GNUNET_TIME_absolute_get();
    pg->feedback_last = GNUNET_TIME_absolute_get();
    pg->feedback_task = GNUNET_SCHEDULER_add_delayed (feedback_frequency,
        &set_feedback_task, pg);
  }

  return pg;
}



/**
 * Stop all preferences generators
 */
void
GNUNET_ATS_solver_generate_preferences_stop_all ()
{
  struct PreferenceGenerator *cur;
  struct PreferenceGenerator *next;
  next = pref_gen_head;
  for (cur = next; NULL != cur; cur = next)
  {
      next = cur->next;
      GNUNET_ATS_solver_generate_preferences_stop(cur);
  }
}



/**
 * Experiments
 */
static const char *
print_op (enum OperationType op)
{
  switch (op) {
    case SOLVER_OP_ADD_ADDRESS:
      return "ADD_ADDRESS";
    case SOLVER_OP_DEL_ADDRESS:
      return "DEL_ADDRESS";
    case SOLVER_OP_START_SET_PREFERENCE:
      return "START_SET_PREFERENCE";
    case SOLVER_OP_STOP_SET_PREFERENCE:
      return "STOP_STOP_PREFERENCE";
    case SOLVER_OP_START_SET_PROPERTY:
      return "START_SET_PROPERTY";
    case SOLVER_OP_STOP_SET_PROPERTY:
      return "STOP_SET_PROPERTY";
    case SOLVER_OP_START_REQUEST:
      return "START_REQUEST";
    case SOLVER_OP_STOP_REQUEST:
      return "STOP_REQUEST";
    default:
      break;
  }
  return "";
}


static struct Experiment *
create_experiment ()
{
  struct Experiment *e;
  e = GNUNET_new (struct Experiment);
  e->name = NULL;
  e->start = NULL;
  e->total_duration = GNUNET_TIME_UNIT_ZERO;
  return e;
}


static void
free_experiment (struct Experiment *e)
{
  struct Episode *cur;
  struct Episode *next;
  struct GNUNET_ATS_TEST_Operation *cur_o;
  struct GNUNET_ATS_TEST_Operation *next_o;

  next = e->start;
  for (cur = next; NULL != cur; cur = next)
  {
    next = cur->next;

    next_o = cur->head;
    for (cur_o = next_o; NULL != cur_o; cur_o = next_o)
    {
      next_o = cur_o->next;
      GNUNET_free_non_null (cur_o->address);
      GNUNET_free_non_null (cur_o->plugin);
      GNUNET_free (cur_o);
    }
    GNUNET_free (cur);
  }

  GNUNET_free_non_null (e->name);
  GNUNET_free_non_null (e->log_prefix);
  GNUNET_free_non_null (e->log_output_dir);
  GNUNET_free_non_null (e->cfg_file);
  GNUNET_free (e);
}


static int
load_op_add_address (struct GNUNET_ATS_TEST_Operation *o,
    struct Episode *e,
    int op_counter,
    char *sec_name,
    const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  char *op_name;
  char *op_network;

  /* peer pid */
  GNUNET_asprintf(&op_name, "op-%u-peer-id", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->peer_id))
  {
    fprintf (stderr, "Missing peer-id in operation %u `%s' in episode `%s'\n",
        op_counter, "ADD_ADDRESS", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* address pid */
  GNUNET_asprintf(&op_name, "op-%u-address-id", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->address_id))
  {
    fprintf (stderr, "Missing address-id in operation %u `%s' in episode `%s'\n",
        op_counter, "ADD_ADDRESS", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* plugin */
  GNUNET_asprintf(&op_name, "op-%u-plugin", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string (cfg,
      sec_name, op_name, &o->plugin))
  {
    fprintf (stderr, "Missing plugin in operation %u `%s' in episode `%s'\n",
        op_counter, "ADD_ADDRESS", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* address  */
  GNUNET_asprintf(&op_name, "op-%u-address", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string (cfg,
      sec_name, op_name, &o->address))
  {
    fprintf (stderr, "Missing address in operation %u `%s' in episode `%s'\n",
        op_counter, "ADD_ADDRESS", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* session */
  GNUNET_asprintf(&op_name, "op-%u-address-session", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->address_session))
  {
    fprintf (stderr, "Missing address-session in operation %u `%s' in episode `%s'\n",
        op_counter, "ADD_ADDRESS", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* network */
  GNUNET_asprintf(&op_name, "op-%u-address-network", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string (cfg,
      sec_name, op_name, &op_network))
  {
    fprintf (stderr, "Missing address-network in operation %u `%s' in episode `%s'\n",
        op_counter, "ADD_ADDRESS", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  else
  {
    GNUNET_STRINGS_utf8_toupper (op_network,op_network);
    if (0 == strcmp(op_network, "UNSPECIFIED"))
    {
      o->address_network = GNUNET_ATS_NET_UNSPECIFIED;
    }
    else if (0 == strcmp(op_network, "LOOPBACK"))
    {
      o->address_network = GNUNET_ATS_NET_LOOPBACK;
    }
    else if (0 == strcmp(op_network, "LAN"))
    {
      o->address_network = GNUNET_ATS_NET_LAN;
    }
    else if (0 == strcmp(op_network, "WAN"))
    {
      o->address_network = GNUNET_ATS_NET_WAN;
    }
    else if (0 == strcmp(op_network, "WLAN"))
    {
      o->address_network = GNUNET_ATS_NET_WLAN;
    }
    else if (0 == strcmp(op_network, "BT"))
    {
      o->address_network = GNUNET_ATS_NET_BT;
    }
    else
    {
      fprintf (stderr, "Invalid address-network in operation %u `%s' in episode `%s': `%s'\n",
          op_counter, "ADD_ADDRESS", op_name, op_network);
      GNUNET_free (op_network);
      GNUNET_free (op_name);
      return GNUNET_SYSERR;
    }
  }
  GNUNET_free (op_network);
  GNUNET_free (op_name);

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
      "Found operation %s: [%llu:%llu] address `%s' plugin `%s' \n",
      "ADD_ADDRESS", o->peer_id, o->address_id, o->address, o->plugin);

  return GNUNET_OK;
}


static int
load_op_del_address (struct GNUNET_ATS_TEST_Operation *o,
    struct Episode *e,
    int op_counter,
    char *sec_name,
    const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  char *op_name;
  //char *op_network;

  /* peer pid */
  GNUNET_asprintf(&op_name, "op-%u-peer-id", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->peer_id))
  {
    fprintf (stderr, "Missing peer-id in operation %u `%s' in episode `%s'\n",
        op_counter, "DEL_ADDRESS", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* address pid */
  GNUNET_asprintf(&op_name, "op-%u-address-id", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->address_id))
  {
    fprintf (stderr, "Missing address-id in operation %u `%s' in episode `%s'\n",
        op_counter, "DEL_ADDRESS", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

#if 0
  /* plugin */
  GNUNET_asprintf(&op_name, "op-%u-plugin", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string (cfg,
      sec_name, op_name, &o->plugin))
  {
    fprintf (stderr, "Missing plugin in operation %u `%s' in episode `%s'\n",
        op_counter, "DEL_ADDRESS", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* address  */
  GNUNET_asprintf(&op_name, "op-%u-address", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string (cfg,
      sec_name, op_name, &o->address))
  {
    fprintf (stderr, "Missing address in operation %u `%s' in episode `%s'\n",
        op_counter, "DEL_ADDRESS", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* session */
  GNUNET_asprintf(&op_name, "op-%u-address-session", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->address_session))
  {
    fprintf (stderr, "Missing address-session in operation %u `%s' in episode `%s'\n",
        op_counter, "DEL_ADDRESS", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);
#endif

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
      "Found operation %s: [%llu:%llu] address `%s' plugin `%s' \n",
      "DEL_ADDRESS", o->peer_id, o->address_id, o->address, o->plugin);

  return GNUNET_OK;
}


static enum GNUNET_ATS_Property
parse_preference_string (const char * str)
{
  int c = 0;
  char *props[GNUNET_ATS_PreferenceCount] = GNUNET_ATS_PreferenceTypeString;

  for (c = 0; c < GNUNET_ATS_PreferenceCount; c++)
    if (0 == strcmp(str, props[c]))
      return c;
  return 0;
}


static int
load_op_start_set_preference (struct GNUNET_ATS_TEST_Operation *o,
    struct Episode *e,
    int op_counter,
    char *sec_name,
    const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  char *op_name;
  char *type;
  char *pref;

  /* peer pid */
  GNUNET_asprintf(&op_name, "op-%u-peer-id", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->peer_id))
  {
    fprintf (stderr, "Missing peer-id in operation %u  `%s' in episode `%s'\n",
        op_counter, "START_SET_PREFERENCE", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* address pid */
  GNUNET_asprintf(&op_name, "op-%u-client-id", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->client_id))
  {
    fprintf (stderr, "Missing client-id in operation %u `%s' in episode `%s'\n",
        op_counter, "START_SET_PREFERENCE", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* generator */
  GNUNET_asprintf(&op_name, "op-%u-gen-type", op_counter);
  if ( (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg,
          sec_name, op_name, &type)) )
  {
    fprintf (stderr, "Missing type in operation %u `%s' in episode `%s'\n",
        op_counter, "START_SET_PREFERENCE", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }

  /* Load arguments for set_rate, start_send, set_preference */
  if (0 == strcmp (type, "constant"))
  {
    o->gen_type = GNUNET_ATS_TEST_TG_CONSTANT;
  }
  else if (0 == strcmp (type, "linear"))
  {
    o->gen_type = GNUNET_ATS_TEST_TG_LINEAR;
  }
  else if (0 == strcmp (type, "sinus"))
  {
    o->gen_type = GNUNET_ATS_TEST_TG_SINUS;
  }
  else if (0 == strcmp (type, "random"))
  {
    o->gen_type = GNUNET_ATS_TEST_TG_RANDOM;
  }
  else
  {
    fprintf (stderr, "Invalid generator type %u `%s' in episode %u\n",
        op_counter, op_name, e->id);
    GNUNET_free (type);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (type);
  GNUNET_free (op_name);


  /* Get base rate */
  GNUNET_asprintf(&op_name, "op-%u-base-rate", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->base_rate))
  {
    fprintf (stderr, "Missing base rate in operation %u `%s' in episode %u\n",
        op_counter, op_name, e->id);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);


  /* Get max rate */
  GNUNET_asprintf(&op_name, "op-%u-max-rate", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->max_rate))
  {
    if ((GNUNET_ATS_TEST_TG_LINEAR == o->gen_type) ||
        (GNUNET_ATS_TEST_TG_RANDOM == o->gen_type) ||
        (GNUNET_ATS_TEST_TG_SINUS == o->gen_type))
    {
      fprintf (stderr, "Missing max rate in operation %u `%s' in episode %u\n",
          op_counter, op_name, e->id);
      GNUNET_free (op_name);
      return GNUNET_SYSERR;
    }
  }
  GNUNET_free (op_name);

  /* Get period */
  GNUNET_asprintf(&op_name, "op-%u-period", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_time (cfg,
      sec_name, op_name, &o->period))
  {
    o->period = e->duration;
  }
  GNUNET_free (op_name);

  /* Get frequency */
  GNUNET_asprintf(&op_name, "op-%u-frequency", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_time (cfg,
      sec_name, op_name, &o->frequency))
  {
      fprintf (stderr, "Missing frequency in operation %u `%s' in episode %u\n",
          op_counter, op_name, e->id);
      GNUNET_free (op_name);
      return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* Get preference */
  GNUNET_asprintf(&op_name, "op-%u-pref", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string (cfg,
      sec_name, op_name, &pref))
  {
      fprintf (stderr, "Missing preference in operation %u `%s' in episode %u\n",
          op_counter, op_name, e->id);
      GNUNET_free (op_name);
      return GNUNET_SYSERR;
  }

  if (0 == (o->pref_type = parse_preference_string(pref)))
  {
      fprintf (stderr, "Invalid preference in operation %u `%s' in episode %u\n",
          op_counter, op_name, e->id);
      GNUNET_free (op_name);
      GNUNET_free (pref);
      return GNUNET_SYSERR;
  }
  GNUNET_free (pref);
  GNUNET_free (op_name);

  /* Get feedback delay */
  GNUNET_asprintf(&op_name, "op-%u-feedback_delay", op_counter);
  if (GNUNET_OK == GNUNET_CONFIGURATION_get_value_time (cfg,
      sec_name, op_name, &o->feedback_delay))
  {
      fprintf (stderr, "Using feedback delay %llu in operation %u `%s' in episode %u\n",
          (long long unsigned int) o->feedback_delay.rel_value_us,
          op_counter, op_name, e->id);
  }
  else
    o->feedback_delay = GNUNET_TIME_UNIT_FOREVER_REL;
  GNUNET_free (op_name);

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
      "Found operation %s: [%llu:%llu]: %s = %llu\n",
      "START_SET_PREFERENCE", o->peer_id, o->address_id,
      GNUNET_ATS_print_preference_type(o->pref_type), o->base_rate);

  return GNUNET_OK;
}


static int
load_op_stop_set_preference (struct GNUNET_ATS_TEST_Operation *o,
    struct Episode *e,
    int op_counter,
    char *sec_name,
    const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  char *op_name;
  char *pref;

  /* peer pid */
  GNUNET_asprintf(&op_name, "op-%u-peer-id", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->peer_id))
  {
    fprintf (stderr, "Missing peer-id in operation %u  `%s' in episode `%s'\n",
        op_counter, "STOP_SET_PREFERENCE", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* address pid */
  GNUNET_asprintf(&op_name, "op-%u-address-id", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->address_id))
  {
    fprintf (stderr, "Missing address-id in operation %u `%s' in episode `%s'\n",
        op_counter, "STOP_SET_PREFERENCE", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* Get preference */
  GNUNET_asprintf(&op_name, "op-%u-pref", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string (cfg,
      sec_name, op_name, &pref))
  {
    fprintf (stderr, "Missing preference in operation %u `%s' in episode `%s'\n",
        op_counter, "STOP_SET_PREFERENCE", op_name);
      GNUNET_free (op_name);
      return GNUNET_SYSERR;
  }

  if (0 == (o->pref_type = parse_preference_string(pref)))
  {
      fprintf (stderr, "Invalid preference in operation %u `%s' in episode %u\n",
          op_counter, op_name, e->id);
      GNUNET_free (op_name);
      GNUNET_free (pref);
      return GNUNET_SYSERR;
  }
  GNUNET_free (pref);
  GNUNET_free (op_name);

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
      "Found operation %s: [%llu:%llu]: %s\n",
      "STOP_SET_PREFERENCE", o->peer_id, o->address_id,
      GNUNET_ATS_print_preference_type(o->pref_type));
  return GNUNET_OK;
}


static enum GNUNET_ATS_Property
parse_property_string (const char *str)
{
  enum GNUNET_ATS_Property c;

  for (c = 0; c < GNUNET_ATS_PropertyCount; c++)
    if (0 == strcmp(str,
                    GNUNET_ATS_print_property_type (c)))
      return c;
  return 0;
}


static int
load_op_start_set_property(struct GNUNET_ATS_TEST_Operation *o,
    struct Episode *e,
    int op_counter,
    char *sec_name,
    const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  char *op_name;
  char *type;
  char *prop;

  /* peer pid */
  GNUNET_asprintf(&op_name, "op-%u-peer-id", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->peer_id))
  {
    fprintf (stderr, "Missing peer-id in operation %u  `%s' in episode `%s'\n",
        op_counter, "START_SET_PROPERTY", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* address pid */
  GNUNET_asprintf(&op_name, "op-%u-address-id", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->address_id))
  {
    fprintf (stderr, "Missing address-id in operation %u `%s' in episode `%s'\n",
        op_counter, "START_SET_PROPERTY", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* generator */
  GNUNET_asprintf(&op_name, "op-%u-gen-type", op_counter);
  if ( (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg,
          sec_name, op_name, &type)) )
  {
    fprintf (stderr, "Missing type in operation %u `%s' in episode `%s'\n",
        op_counter, "START_SET_PROPERTY", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }

  /* Load arguments for set_rate, start_send, set_preference */
  if (0 == strcmp (type, "constant"))
  {
    o->gen_type = GNUNET_ATS_TEST_TG_CONSTANT;
  }
  else if (0 == strcmp (type, "linear"))
  {
    o->gen_type = GNUNET_ATS_TEST_TG_LINEAR;
  }
  else if (0 == strcmp (type, "sinus"))
  {
    o->gen_type = GNUNET_ATS_TEST_TG_SINUS;
  }
  else if (0 == strcmp (type, "random"))
  {
    o->gen_type = GNUNET_ATS_TEST_TG_RANDOM;
  }
  else
  {
    fprintf (stderr, "Invalid generator type %u `%s' in episode %u\n",
        op_counter, op_name, e->id);
    GNUNET_free (type);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (type);
  GNUNET_free (op_name);


  /* Get base rate */
  GNUNET_asprintf(&op_name, "op-%u-base-rate", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->base_rate))
  {
    fprintf (stderr, "Missing base rate in operation %u `%s' in episode %u\n",
        op_counter, op_name, e->id);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);


  /* Get max rate */
  GNUNET_asprintf(&op_name, "op-%u-max-rate", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->max_rate))
  {
    if ((GNUNET_ATS_TEST_TG_LINEAR == o->gen_type) ||
        (GNUNET_ATS_TEST_TG_RANDOM == o->gen_type) ||
        (GNUNET_ATS_TEST_TG_SINUS == o->gen_type))
    {
      fprintf (stderr, "Missing max rate in operation %u `%s' in episode %u\n",
          op_counter, op_name, e->id);
      GNUNET_free (op_name);
      return GNUNET_SYSERR;
    }
  }
  GNUNET_free (op_name);

  /* Get period */
  GNUNET_asprintf(&op_name, "op-%u-period", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_time (cfg,
      sec_name, op_name, &o->period))
  {
    o->period = e->duration;
  }
  GNUNET_free (op_name);

  /* Get frequency */
  GNUNET_asprintf(&op_name, "op-%u-frequency", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_time (cfg,
      sec_name, op_name, &o->frequency))
  {
      fprintf (stderr, "Missing frequency in operation %u `%s' in episode %u\n",
          op_counter, op_name, e->id);
      GNUNET_free (op_name);
      return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* Get preference */
  GNUNET_asprintf(&op_name, "op-%u-property", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string (cfg,
      sec_name, op_name, &prop))
  {
      fprintf (stderr, "Missing property in operation %u `%s' in episode %u\n",
          op_counter, op_name, e->id);
      GNUNET_free (op_name);
      GNUNET_free_non_null (prop);
      return GNUNET_SYSERR;
  }

  if (0 == (o->prop_type = parse_property_string(prop)))
  {
      fprintf (stderr, "Invalid property in operation %u `%s' in episode %u\n",
          op_counter, op_name, e->id);
      GNUNET_free (op_name);
      GNUNET_free (prop);
      return GNUNET_SYSERR;
  }

  GNUNET_free (prop);
  GNUNET_free (op_name);

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
      "Found operation %s: [%llu:%llu] %s = %llu\n",
      "START_SET_PROPERTY", o->peer_id, o->address_id,
      GNUNET_ATS_print_property_type (o->prop_type), o->base_rate);

  return GNUNET_OK;
}

static int
load_op_stop_set_property (struct GNUNET_ATS_TEST_Operation *o,
    struct Episode *e,
    int op_counter,
    char *sec_name,
    const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  char *op_name;
  char *pref;

  /* peer pid */
  GNUNET_asprintf(&op_name, "op-%u-peer-id", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->peer_id))
  {
    fprintf (stderr, "Missing peer-id in operation %u  `%s' in episode `%s'\n",
        op_counter, "STOP_SET_PROPERTY", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* address pid */
  GNUNET_asprintf(&op_name, "op-%u-address-id", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->address_id))
  {
    fprintf (stderr, "Missing address-id in operation %u `%s' in episode `%s'\n",
        op_counter, "STOP_SET_PROPERTY", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);

  /* Get property */
  GNUNET_asprintf(&op_name, "op-%u-property", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string (cfg,
      sec_name, op_name, &pref))
  {
    fprintf (stderr, "Missing property in operation %u `%s' in episode `%s'\n",
        op_counter, "STOP_SET_PROPERTY", op_name);
      GNUNET_free (op_name);
      GNUNET_free_non_null (pref);
      return GNUNET_SYSERR;
  }

  if (0 == (o->prop_type = parse_property_string(pref)))
  {
      fprintf (stderr, "Invalid property in operation %u `%s' in episode %u\n",
          op_counter, op_name, e->id);
      GNUNET_free (op_name);
      GNUNET_free_non_null (pref);
      return GNUNET_SYSERR;
  }

  GNUNET_free (pref);
  GNUNET_free (op_name);

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
      "Found operation %s: [%llu:%llu] %s\n",
      "STOP_SET_PROPERTY", o->peer_id, o->address_id,
      GNUNET_ATS_print_property_type (o->prop_type));

  return GNUNET_OK;
}


static int
load_op_start_request (struct GNUNET_ATS_TEST_Operation *o,
    struct Episode *e,
    int op_counter,
    char *sec_name,
    const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  char *op_name;

  /* peer pid */
  GNUNET_asprintf(&op_name, "op-%u-peer-id", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->peer_id))
  {
    fprintf (stderr, "Missing peer-id in operation %u  `%s' in episode `%s'\n",
        op_counter, "START_REQUEST", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);
  return GNUNET_OK;
}

static int
load_op_stop_request (struct GNUNET_ATS_TEST_Operation *o,
    struct Episode *e,
    int op_counter,
    char *sec_name,
    const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  char *op_name;

  /* peer pid */
  GNUNET_asprintf(&op_name, "op-%u-peer-id", op_counter);
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_number (cfg,
      sec_name, op_name, &o->peer_id))
  {
    fprintf (stderr, "Missing peer-id in operation %u  `%s' in episode `%s'\n",
        op_counter, "STOP_REQUEST", op_name);
    GNUNET_free (op_name);
    return GNUNET_SYSERR;
  }
  GNUNET_free (op_name);
  return GNUNET_OK;
}


static int
load_episode (struct Experiment *e, struct Episode *cur,
    struct GNUNET_CONFIGURATION_Handle *cfg)
{
  struct GNUNET_ATS_TEST_Operation *o;
  char *sec_name;
  char *op_name;
  char *op;
  int op_counter = 0;
  int res;
  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "=== Parsing episode %u\n",cur->id);
  GNUNET_asprintf(&sec_name, "episode-%u", cur->id);

  while (1)
  {
    /* Load operation */
    GNUNET_asprintf(&op_name, "op-%u-operation", op_counter);
    if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg,
        sec_name, op_name, &op))
    {
      GNUNET_free (op_name);
      break;
    }
    o = GNUNET_new (struct GNUNET_ATS_TEST_Operation);
    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "==== Parsing operation %u: `%s'\n",
        cur->id, op_name);

    /* operations = set_rate, start_send, stop_send, set_preference */
    if (0 == strcmp (op, "address_add"))
    {
      o->type = SOLVER_OP_ADD_ADDRESS;
      res = load_op_add_address (o, cur,
          op_counter, sec_name, cfg);
    }
    else if (0 == strcmp (op, "address_del"))
    {
      o->type = SOLVER_OP_DEL_ADDRESS;
      res = load_op_del_address (o, cur,
          op_counter, sec_name, cfg);
    }
    else if (0 == strcmp (op, "start_set_property"))
    {
      o->type = SOLVER_OP_START_SET_PROPERTY;
      res = load_op_start_set_property (o, cur,
          op_counter, sec_name, cfg);
    }
    else if (0 == strcmp (op, "stop_set_property"))
    {
      o->type = SOLVER_OP_STOP_SET_PROPERTY;
      res = load_op_stop_set_property (o, cur,
          op_counter, sec_name, cfg);
    }
    else if (0 == strcmp (op, "start_set_preference"))
    {
      o->type = SOLVER_OP_START_SET_PREFERENCE;
      res =  load_op_start_set_preference (o, cur,
          op_counter, sec_name, cfg);
    }
    else if (0 == strcmp (op, "stop_set_preference"))
    {
      o->type = SOLVER_OP_STOP_SET_PREFERENCE;
      res =  load_op_stop_set_preference (o, cur,
          op_counter, sec_name, cfg);
    }
    else if (0 == strcmp (op, "start_request"))
    {
      o->type = SOLVER_OP_START_REQUEST;
      res = load_op_start_request (o, cur,
          op_counter, sec_name, cfg);
    }
    else if (0 == strcmp (op, "stop_request"))
    {
      o->type = SOLVER_OP_STOP_REQUEST;
      res = load_op_stop_request(o, cur,
          op_counter, sec_name, cfg);
    }
    else
    {
      fprintf (stderr, "Invalid operation %u `%s' in episode %u\n",
          op_counter, op, cur->id);
      res = GNUNET_SYSERR;
    }

    GNUNET_free (op);
    GNUNET_free (op_name);

    if (GNUNET_SYSERR == res)
    {
      GNUNET_free (o);
      GNUNET_free (sec_name);
      return GNUNET_SYSERR;
    }

    GNUNET_CONTAINER_DLL_insert_tail (cur->head,cur->tail, o);
    op_counter++;
  }
  GNUNET_free (sec_name);
  return GNUNET_OK;
}

static int
load_episodes (struct Experiment *e, struct GNUNET_CONFIGURATION_Handle *cfg)
{
  int e_counter = 0;
  char *sec_name;
  struct GNUNET_TIME_Relative e_duration;
  struct Episode *cur;
  struct Episode *last;

  e_counter = 0;
  last = NULL;
  while (1)
  {
    GNUNET_asprintf(&sec_name, "episode-%u", e_counter);
    if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_time(cfg,
        sec_name, "duration", &e_duration))
    {
      GNUNET_free (sec_name);
      break;
    }

    cur = GNUNET_new (struct Episode);
    cur->duration = e_duration;
    cur->id = e_counter;

    if (GNUNET_OK != load_episode (e, cur, cfg))
    {
      GNUNET_free (sec_name);
      GNUNET_free (cur);
      return GNUNET_SYSERR;
    }

    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Found episode %u with duration %s \n",
        e_counter,
        GNUNET_STRINGS_relative_time_to_string(cur->duration, GNUNET_YES));

    /* Update experiment */
    e->num_episodes ++;
    e->total_duration = GNUNET_TIME_relative_add(e->total_duration, cur->duration);
    /* Put in linked list */
    if (NULL == last)
      e->start = cur;
    else
      last->next = cur;

    GNUNET_free (sec_name);
    e_counter ++;
    last = cur;
  }
  return e_counter;
}

static void
timeout_experiment (void *cls, const struct GNUNET_SCHEDULER_TaskContext* tc)
{
  struct Experiment *e = cls;
  e->experiment_timeout_task = NULL;
  fprintf (stderr, "Experiment timeout!\n");

  if (NULL != e->episode_timeout_task)
  {
    GNUNET_SCHEDULER_cancel (e->episode_timeout_task);
    e->episode_timeout_task = NULL;
  }

  e->e_done_cb (e, GNUNET_TIME_absolute_get_duration(e->start_time),
      GNUNET_SYSERR);
}

struct ATS_Address *
create_ats_address (const struct GNUNET_PeerIdentity *peer,
                const char *plugin_name,
                const void *plugin_addr,
                size_t plugin_addr_len,
                uint32_t session_id,
                uint32_t network)
{
  struct ATS_Address *aa = NULL;

  aa = GNUNET_malloc (sizeof (struct ATS_Address) + plugin_addr_len + strlen (plugin_name) + 1);
  aa->atsi = GNUNET_new (struct GNUNET_ATS_Information);
  aa->atsi[0].type = htonl (GNUNET_ATS_NETWORK_TYPE);
  aa->atsi[0].value = htonl (network);
  aa->atsi_count = 1;

  aa->peer = *peer;
  aa->addr_len = plugin_addr_len;
  aa->addr = &aa[1];
  aa->plugin = (char *) &aa[1] + plugin_addr_len;
  memcpy (&aa[1], plugin_addr, plugin_addr_len);
  memcpy (aa->plugin, plugin_name, strlen (plugin_name) + 1);
  aa->session_id = session_id;

  return aa;
}



static void
enforce_add_address (struct GNUNET_ATS_TEST_Operation *op)
{
  struct TestPeer *p;
  struct TestAddress *a;
  int c;

  if (NULL == (p = find_peer_by_id (op->peer_id)))
  {
    p = GNUNET_new (struct TestPeer);
    p->id = op->peer_id;
    p->assigned_bw_in = 0;
    p->assigned_bw_out = 0;
    memset (&p->peer_id, op->peer_id, sizeof (p->peer_id));
    for (c = 0; c < GNUNET_ATS_PreferenceCount; c++)
    {
      p->pref_abs[c] = DEFAULT_ABS_PREFERENCE;
      p->pref_norm[c] = DEFAULT_REL_PREFERENCE;
    }

    GNUNET_CONTAINER_DLL_insert (peer_head, peer_tail, p);
  }

  if (NULL != (find_address_by_id (p, op->address_id)))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Duplicate address %u for peer %u\n",
        op->address_id, op->peer_id);
    return;
  }

  a = GNUNET_new (struct TestAddress);
  a->aid = op->address_id;
  a->network = op->address_network;
  a->ats_addr = create_ats_address (&p->peer_id, op->plugin, op->address,
      strlen (op->address) + 1, op->address_session, op->address_network);
  memset (&p->peer_id, op->peer_id, sizeof (p->peer_id));
  GNUNET_CONTAINER_DLL_insert_tail (p->addr_head, p->addr_tail, a);

  for (c = 0; c < GNUNET_ATS_PropertyCount; c++)
    a->prop_norm[c] = DEFAULT_REL_QUALITY;

  GNUNET_CONTAINER_multipeermap_put (sh->addresses, &p->peer_id, a->ats_addr,
    GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);

  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Adding address %u for peer %u in network `%s'\n",
    op->address_id, op->peer_id, GNUNET_ATS_print_network_type(a->network));

  sh->sf->s_add (sh->sf->cls, a->ats_addr, op->address_network);

}


static void
enforce_del_address (struct GNUNET_ATS_TEST_Operation *op)
{
  struct TestPeer *p;
  struct TestAddress *a;
  struct PropertyGenerator *pg;

  if (NULL == (p = find_peer_by_id (op->peer_id)))
  {
    GNUNET_break (0);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
        "Deleting address for unknown peer %u\n", op->peer_id);
    return;
  }

  if (NULL == (a =find_address_by_id (p, op->address_id)))
  {
    GNUNET_break (0);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
        "Deleting address for unknown peer %u\n", op->peer_id);
    return;
  }

  while (NULL != (pg = find_prop_gen (p->id, a->aid, 0)))
  {
    GNUNET_ATS_solver_generate_property_stop (pg);
  }

  GNUNET_assert (GNUNET_YES ==
                 GNUNET_CONTAINER_multipeermap_remove (sh->addresses,
                                                       &p->peer_id,
                                                       a->ats_addr));
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Removing address %u for peer %u\n",
              op->address_id,
              op->peer_id);

  sh->sf->s_del (sh->sf->cls, a->ats_addr);

  if (NULL != l)
  {
    GNUNET_ATS_solver_logging_now (l);
  }
  GNUNET_CONTAINER_DLL_remove(p->addr_head, p->addr_tail, a);

  GNUNET_free_non_null(a->ats_addr->atsi);
  GNUNET_free (a->ats_addr);
  GNUNET_free (a);

}

static void
enforce_start_property (struct GNUNET_ATS_TEST_Operation *op)
{
  struct PropertyGenerator *pg;
  struct TestPeer *p;
  struct TestAddress *a;

  if (NULL != (pg = find_prop_gen (op->peer_id, op->address_id, op->prop_type)))
  {
    GNUNET_ATS_solver_generate_property_stop (pg);
    GNUNET_free (pg);
  }

  if (NULL == (p = find_peer_by_id (op->peer_id)))
  {
    GNUNET_break (0);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
        "Starting property generation for unknown peer %u\n", op->peer_id);
    return;
  }

  if (NULL == (a = find_address_by_id (p, op->address_id)))
  {
    GNUNET_break (0);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
        "Setting property for unknown address %u\n", op->peer_id);
    return;
  }

  GNUNET_ATS_solver_generate_property_start (op->peer_id,
    op->address_id,
    p, a,
    op->gen_type,
    op->base_rate,
    op->max_rate,
    op->period,
    op->frequency,
    op->prop_type);
}

static void
enforce_stop_property (struct GNUNET_ATS_TEST_Operation *op)
{
  struct PropertyGenerator *pg = find_prop_gen(op->peer_id, op->address_id,
      op->prop_type);
  if (NULL != pg)
  {
    GNUNET_log(GNUNET_ERROR_TYPE_INFO,
        "Stopping preference generation for peer %u address %u\n", op->peer_id,
        op->address_id);
    GNUNET_ATS_solver_generate_property_stop (pg);
  }
  else
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
        "Cannot find preference generator for peer %u address %u\n",
        op->peer_id, op->address_id);
    GNUNET_break (0);
  }
}

static void
enforce_start_preference (struct GNUNET_ATS_TEST_Operation *op)
{
  struct PreferenceGenerator *pg;
  if (NULL != (pg = find_pref_gen (op->peer_id, op->pref_type)))
  {
    GNUNET_ATS_solver_generate_preferences_stop (pg);
    GNUNET_free (pg);
  }

  if (NULL == (find_peer_by_id (op->peer_id)))
  {
    GNUNET_break (0);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
        "Starting preference generation for unknown peer %u\n", op->peer_id);
    return;
  }

  GNUNET_ATS_solver_generate_preferences_start (op->peer_id,
    op->address_id,
    op->client_id,
    op->gen_type,
    op->base_rate,
    op->max_rate,
    op->period,
    op->frequency,
    op->pref_type,
    op->frequency);
}

static void
enforce_stop_preference (struct GNUNET_ATS_TEST_Operation *op)
{
  struct PreferenceGenerator *pg = find_pref_gen(op->peer_id,
      op->pref_type);
  if (NULL != pg)
  {
    GNUNET_log(GNUNET_ERROR_TYPE_INFO,
        "Stopping property generation for peer %u address %u\n", op->peer_id,
        op->address_id);
    GNUNET_ATS_solver_generate_preferences_stop (pg);
  }
  else
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
        "Cannot find preference generator for peer %u address %u\n",
        op->peer_id, op->address_id);
    GNUNET_break (0);
  }
}


static void
enforce_start_request (struct GNUNET_ATS_TEST_Operation *op)
{
  struct TestPeer *p;

  if (NULL == (p = find_peer_by_id (op->peer_id)))
  {
    GNUNET_break (0);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
        "Requesting address for unknown peer %u\n", op->peer_id);
    return;
  }

  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Requesting address for peer %u\n",
      op->peer_id);
  p->is_requested = GNUNET_YES;

  sh->sf->s_get (sh->sf->cls, &p->peer_id);
}


static void
enforce_stop_request (struct GNUNET_ATS_TEST_Operation *op)
{
  struct TestPeer *p;

  if (NULL == (p = find_peer_by_id (op->peer_id)))
  {
    GNUNET_break (0);
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
        "Requesting address for unknown peer %u\n", op->peer_id);
    return;
  }

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Stop requesting address for peer %u\n",
              op->peer_id);
  p->is_requested = GNUNET_NO;
  p->assigned_bw_in = 0;
  p->assigned_bw_out = 0;
  sh->sf->s_get_stop (sh->sf->cls, &p->peer_id);

  if (NULL != l)
  {
    GNUNET_ATS_solver_logging_now (l);
  }

}

static void enforce_episode (struct Episode *ep)
{
  struct GNUNET_ATS_TEST_Operation *cur;
  for (cur = ep->head; NULL != cur; cur = cur->next)
  {
    switch (cur->type) {
      case SOLVER_OP_ADD_ADDRESS:
        fprintf (stderr, "Enforcing operation: %s [%llu:%llu]\n",
            print_op (cur->type), cur->peer_id, cur->address_id);
        enforce_add_address (cur);
        break;
      case SOLVER_OP_DEL_ADDRESS:
        fprintf (stderr, "Enforcing operation: %s [%llu:%llu]\n",
            print_op (cur->type), cur->peer_id, cur->address_id);
        enforce_del_address (cur);
        break;
      case SOLVER_OP_START_SET_PROPERTY:
        fprintf (stderr, "Enforcing operation: %s [%llu:%llu] == %llu\n",
            print_op (cur->type), cur->peer_id, cur->address_id, cur->base_rate);
        enforce_start_property (cur);
        break;
      case SOLVER_OP_STOP_SET_PROPERTY:
        fprintf (stderr, "Enforcing operation: %s [%llu:%llu] == %llu\n",
            print_op (cur->type), cur->peer_id, cur->address_id, cur->base_rate);
        enforce_stop_property (cur);
        break;
      case SOLVER_OP_START_SET_PREFERENCE:
        fprintf (stderr, "Enforcing operation: %s [%llu:%llu] == %llu\n",
            print_op (cur->type), cur->peer_id, cur->address_id, cur->base_rate);
        enforce_start_preference (cur);
        break;
      case SOLVER_OP_STOP_SET_PREFERENCE:
        fprintf (stderr, "Enforcing operation: %s [%llu:%llu] == %llu\n",
            print_op (cur->type), cur->peer_id, cur->address_id, cur->base_rate);
        enforce_stop_preference (cur);
        break;
      case SOLVER_OP_START_REQUEST:
        fprintf (stderr, "Enforcing operation: %s [%llu]\n",
            print_op (cur->type), cur->peer_id);
        enforce_start_request (cur);
        break;
      case SOLVER_OP_STOP_REQUEST:
        fprintf (stderr, "Enforcing operation: %s [%llu]\n",
            print_op (cur->type), cur->peer_id);
        enforce_stop_request (cur);
        break;
      default:
        break;
    }
  }
}

static void
timeout_episode (void *cls, const struct GNUNET_SCHEDULER_TaskContext* tc)
{
  struct Experiment *e = cls;
  e->episode_timeout_task = NULL;
  if (NULL != e->ep_done_cb)
    e->ep_done_cb (e->cur);

  /* Scheduling next */
  e->cur = e->cur->next;
  if (NULL == e->cur)
  {
    /* done */
    fprintf (stderr, "Last episode done!\n");
    if (NULL != e->experiment_timeout_task)
    {
      GNUNET_SCHEDULER_cancel (e->experiment_timeout_task);
      e->experiment_timeout_task = NULL;
    }
    e->e_done_cb (e, GNUNET_TIME_absolute_get_duration(e->start_time), GNUNET_OK);
    return;
  }

  fprintf (stderr, "Running episode %u with timeout %s\n",
      e->cur->id,
      GNUNET_STRINGS_relative_time_to_string(e->cur->duration, GNUNET_YES));
  e->episode_timeout_task = GNUNET_SCHEDULER_add_delayed (e->cur->duration,
      &timeout_episode, e);
  enforce_episode(e->cur);


}


void
GNUNET_ATS_solvers_experimentation_run (struct Experiment *e,
    GNUNET_ATS_TESTING_EpisodeDoneCallback ep_done_cb,
    GNUNET_ATS_TESTING_ExperimentDoneCallback e_done_cb)
{
  fprintf (stderr, "Running experiment `%s'  with timeout %s\n", e->name,
      GNUNET_STRINGS_relative_time_to_string(e->max_duration, GNUNET_YES));
  e->e_done_cb = e_done_cb;
  e->ep_done_cb = ep_done_cb;
  e->start_time = GNUNET_TIME_absolute_get();

  /* Start total time out */
  e->experiment_timeout_task = GNUNET_SCHEDULER_add_delayed (e->max_duration,
      &timeout_experiment, e);

  /* Start */
  if (NULL == e->start)
  {
    GNUNET_break (0);
    return;
  }

  e->cur = e->start;
  fprintf (stderr, "Running episode %u with timeout %s\n",
      e->cur->id,
      GNUNET_STRINGS_relative_time_to_string(e->cur->duration, GNUNET_YES));
  e->episode_timeout_task = GNUNET_SCHEDULER_add_delayed (e->cur->duration,
      &timeout_episode, e);
  enforce_episode(e->cur);

}

void
GNUNET_ATS_solvers_experimentation_stop (struct Experiment *e)
{
  if (NULL != e->experiment_timeout_task)
  {
    GNUNET_SCHEDULER_cancel (e->experiment_timeout_task);
    e->experiment_timeout_task = NULL;
  }
  if (NULL != e->episode_timeout_task)
  {
    GNUNET_SCHEDULER_cancel (e->episode_timeout_task);
    e->episode_timeout_task = NULL;
  }
  if (NULL != e->cfg)
  {
    GNUNET_CONFIGURATION_destroy(e->cfg);
    e->cfg = NULL;
  }
  free_experiment (e);
}


struct Experiment *
GNUNET_ATS_solvers_experimentation_load (char *filename)
{
  struct Experiment *e;
  struct GNUNET_CONFIGURATION_Handle *cfg;
  e = NULL;

  cfg = GNUNET_CONFIGURATION_create();
  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_load (cfg, filename))
  {
    fprintf (stderr, "Failed to load `%s'\n", filename);
    GNUNET_CONFIGURATION_destroy (cfg);
    return NULL;
  }

  e = create_experiment ();

  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "experiment",
      "name", &e->name))
  {
    fprintf (stderr, "Invalid %s \n", "name");
    free_experiment (e);
    return NULL;
  }
  else
    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Experiment name: `%s'\n", e->name);

  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_string(cfg, "experiment",
      "log_prefix", &e->log_prefix))
  {
    fprintf (stderr, "Invalid %s \n", "log_prefix");
    free_experiment (e);
    return NULL;
  }
  else
    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Experiment logging prefix: `%s'\n",
        e->log_prefix);

  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_filename (cfg, "experiment",
      "log_output_dir", &e->log_output_dir))
  {
    e->log_output_dir = NULL;
  }
  else
    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Experiment logging output directory: `%s'\n",
        e->log_output_dir);


  if (GNUNET_SYSERR == (e->log_append_time_stamp = GNUNET_CONFIGURATION_get_value_yesno(cfg,
      "experiment", "log_append_time_stamp")))
    e->log_append_time_stamp = GNUNET_YES;
  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Experiment logging append timestamp: `%s'\n",
      (GNUNET_YES == e->log_append_time_stamp) ? "yes" : "no");


  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_filename (cfg, "experiment",
      "cfg_file", &e->cfg_file))
  {
    fprintf (stderr, "Invalid %s \n", "cfg_file");
    free_experiment (e);
    return NULL;
  }
  else
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Experiment configuration: `%s'\n", e->cfg_file);
    e->cfg = GNUNET_CONFIGURATION_create();
    if (GNUNET_SYSERR == GNUNET_CONFIGURATION_load (e->cfg, e->cfg_file))
    {
      fprintf (stderr, "Invalid configuration %s \n", "cfg_file");
      free_experiment (e);
      return NULL;
    }

  }

  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_time(cfg, "experiment",
      "log_freq", &e->log_freq))
  {
    fprintf (stderr, "Invalid %s \n", "log_freq");
    free_experiment (e);
    return NULL;
  }
  else
    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Experiment logging frequency: `%s'\n",
        GNUNET_STRINGS_relative_time_to_string (e->log_freq, GNUNET_YES));

  if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_time(cfg, "experiment",
      "max_duration", &e->max_duration))
  {
    fprintf (stderr, "Invalid %s", "max_duration");
    free_experiment (e);
    return NULL;
  }
  else
    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Experiment duration: `%s'\n",
        GNUNET_STRINGS_relative_time_to_string (e->max_duration, GNUNET_YES));

  if (GNUNET_SYSERR == load_episodes (e, cfg))
  {
    GNUNET_ATS_solvers_experimentation_stop (e);
    GNUNET_CONFIGURATION_destroy (cfg);
    e = NULL;
    fprintf (stderr, "Failed to load experiment\n");
    return NULL;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Loaded %u episodes with total duration %s\n",
      e->num_episodes,
      GNUNET_STRINGS_relative_time_to_string (e->total_duration, GNUNET_YES));

  GNUNET_CONFIGURATION_destroy (cfg);
  return e;
}



/**
 * Solver
 */

static int
free_all_it (void *cls,
    const struct GNUNET_PeerIdentity *key,
    void *value)
{
  struct ATS_Address *address = value;
  GNUNET_break (GNUNET_OK == GNUNET_CONTAINER_multipeermap_remove (sh->env.addresses,
      key, value));
  GNUNET_free (address);

  return GNUNET_OK;
}

void
GNUNET_ATS_solvers_solver_stop (struct SolverHandle *sh)
{
 GNUNET_STATISTICS_destroy ((struct GNUNET_STATISTICS_Handle *) sh->env.stats,
     GNUNET_NO);
 GNUNET_PLUGIN_unload (sh->plugin, sh->sf);
 sh->sf = NULL;
 GAS_normalization_stop();

 GNUNET_CONTAINER_multipeermap_iterate (sh->addresses,
                                        &free_all_it,
                                        NULL);
 GNUNET_CONTAINER_multipeermap_destroy(sh->addresses);
 GNUNET_free (sh->plugin);
 GNUNET_free (sh);
}


/**
 * Load quotas for networks from configuration
 *
 * @param cfg configuration handle
 * @param out_dest where to write outbound quotas
 * @param in_dest where to write inbound quotas
 * @param dest_length length of inbound and outbound arrays
 * @return number of networks loaded
 */
unsigned int
GNUNET_ATS_solvers_load_quotas (const struct GNUNET_CONFIGURATION_Handle *cfg,
                                                 unsigned long long *out_dest,
                                                 unsigned long long *in_dest,
                                                 int dest_length)
{
  char * entry_in = NULL;
  char * entry_out = NULL;
  char * quota_out_str;
  char * quota_in_str;
  int c;
  int res;

  for (c = 0; (c < GNUNET_ATS_NetworkTypeCount) && (c < dest_length); c++)
  {
    in_dest[c] = 0;
    out_dest[c] = 0;
    GNUNET_asprintf (&entry_out,
                     "%s_QUOTA_OUT",
                     GNUNET_ATS_print_network_type (c));
    GNUNET_asprintf (&entry_in,
                     "%s_QUOTA_IN",
                     GNUNET_ATS_print_network_type (c));

    /* quota out */
    if (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "ats", entry_out, &quota_out_str))
    {
      res = GNUNET_NO;
      if (0 == strcmp(quota_out_str, BIG_M_STRING))
      {
        out_dest[c] = GNUNET_ATS_MaxBandwidth;
        res = GNUNET_YES;
      }
      if ((GNUNET_NO == res) && (GNUNET_OK == GNUNET_STRINGS_fancy_size_to_bytes (quota_out_str, &out_dest[c])))
        res = GNUNET_YES;
      if ((GNUNET_NO == res) && (GNUNET_OK == GNUNET_CONFIGURATION_get_value_number (cfg, "ats", entry_out,  &out_dest[c])))
         res = GNUNET_YES;

      if (GNUNET_NO == res)
      {
          GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                      _("Could not load quota for network `%s':  `%s', assigning default bandwidth %llu\n"),
                      GNUNET_ATS_print_network_type (c),
                      quota_out_str,
                      GNUNET_ATS_DefaultBandwidth);
          out_dest[c] = GNUNET_ATS_DefaultBandwidth;
      }
      else
      {
          GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                      "Outbound quota configure for network `%s' is %llu\n",
                      GNUNET_ATS_print_network_type (c),
                      out_dest[c]);
      }
      GNUNET_free (quota_out_str);
    }
    else
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                  _("No outbound quota configured for network `%s', assigning default bandwidth %llu\n"),
                  GNUNET_ATS_print_network_type (c),
                  GNUNET_ATS_DefaultBandwidth);
      out_dest[c] = GNUNET_ATS_DefaultBandwidth;
    }

    /* quota in */
    if (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, "ats", entry_in, &quota_in_str))
    {
      res = GNUNET_NO;
      if (0 == strcmp(quota_in_str, BIG_M_STRING))
      {
        in_dest[c] = GNUNET_ATS_MaxBandwidth;
        res = GNUNET_YES;
      }
      if ((GNUNET_NO == res) && (GNUNET_OK == GNUNET_STRINGS_fancy_size_to_bytes (quota_in_str, &in_dest[c])))
        res = GNUNET_YES;
      if ((GNUNET_NO == res) && (GNUNET_OK == GNUNET_CONFIGURATION_get_value_number (cfg, "ats", entry_in,  &in_dest[c])))
         res = GNUNET_YES;

      if (GNUNET_NO == res)
      {
          GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                      _("Could not load quota for network `%s':  `%s', assigning default bandwidth %llu\n"),
                      GNUNET_ATS_print_network_type (c),
                      quota_in_str,
                      GNUNET_ATS_DefaultBandwidth);
          in_dest[c] = GNUNET_ATS_DefaultBandwidth;
      }
      else
      {
          GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                      "Inbound quota configured for network `%s' is %llu\n",
                      GNUNET_ATS_print_network_type (c),
                      in_dest[c]);
      }
      GNUNET_free (quota_in_str);
    }
    else
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                  _("No outbound quota configure for network `%s', assigning default bandwidth %llu\n"),
                  GNUNET_ATS_print_network_type (c),
                  GNUNET_ATS_DefaultBandwidth);
      out_dest[c] = GNUNET_ATS_DefaultBandwidth;
    }
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Loaded quota for network `%s' (in/out): %llu %llu\n",
                GNUNET_ATS_print_network_type (c),
                in_dest[c],
                out_dest[c]);
    GNUNET_free (entry_out);
    GNUNET_free (entry_in);
  }
  return GNUNET_ATS_NetworkTypeCount;
}


/**
 * Information callback for the solver
 *
 * @param cls the closure
 * @param op the solver operation
 * @param stat status of the solver operation
 * @param add additional solver information
 */
static void
solver_info_cb (void *cls,
                enum GAS_Solver_Operation op,
                enum GAS_Solver_Status stat,
                enum GAS_Solver_Additional_Information add)
{
  char *add_info;
  switch (add) {
    case GAS_INFO_NONE:
      add_info = "GAS_INFO_NONE";
      break;
    case GAS_INFO_FULL:
      add_info = "GAS_INFO_MLP_FULL";
      break;
    case GAS_INFO_UPDATED:
      add_info = "GAS_INFO_MLP_UPDATED";
      break;
    case GAS_INFO_PROP_ALL:
      add_info = "GAS_INFO_PROP_ALL";
      break;
    case GAS_INFO_PROP_SINGLE:
      add_info = "GAS_INFO_PROP_SINGLE";
      break;
    default:
      add_info = "INVALID";
      break;
  }

  switch (op)
  {
    case GAS_OP_SOLVE_START:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
          "Solver notifies `%s' with result `%s' `%s'\n", "GAS_OP_SOLVE_START",
          (GAS_STAT_SUCCESS == stat) ? "SUCCESS" : "FAIL", add_info);
      return;
    case GAS_OP_SOLVE_STOP:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
          "Solver notifies `%s' with result `%s'\n", "GAS_OP_SOLVE_STOP",
          (GAS_STAT_SUCCESS == stat) ? "SUCCESS" : "FAIL", add_info);
      return;

    case GAS_OP_SOLVE_SETUP_START:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
          "Solver notifies `%s' with result `%s'\n", "GAS_OP_SOLVE_SETUP_START",
          (GAS_STAT_SUCCESS == stat) ? "SUCCESS" : "FAIL");
      return;

    case GAS_OP_SOLVE_SETUP_STOP:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
          "Solver notifies `%s' with result `%s'\n", "GAS_OP_SOLVE_SETUP_STOP",
          (GAS_STAT_SUCCESS == stat) ? "SUCCESS" : "FAIL");
      return;

    case GAS_OP_SOLVE_MLP_LP_START:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
          "Solver notifies `%s' with result `%s'\n", "GAS_OP_SOLVE_LP_START",
          (GAS_STAT_SUCCESS == stat) ? "SUCCESS" : "FAIL");
      return;
    case GAS_OP_SOLVE_MLP_LP_STOP:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
          "Solver notifies `%s' with result `%s'\n", "GAS_OP_SOLVE_LP_STOP",
          (GAS_STAT_SUCCESS == stat) ? "SUCCESS" : "FAIL");
      return;

    case GAS_OP_SOLVE_MLP_MLP_START:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
          "Solver notifies `%s' with result `%s'\n", "GAS_OP_SOLVE_MLP_START",
          (GAS_STAT_SUCCESS == stat) ? "SUCCESS" : "FAIL");
      return;
    case GAS_OP_SOLVE_MLP_MLP_STOP:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
          "Solver notifies `%s' with result `%s'\n", "GAS_OP_SOLVE_MLP_STOP",
          (GAS_STAT_SUCCESS == stat) ? "SUCCESS" : "FAIL");
      return;
    case GAS_OP_SOLVE_UPDATE_NOTIFICATION_START:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
          "Solver notifies `%s' with result `%s'\n", "GAS_OP_SOLVE_UPDATE_NOTIFICATION_START",
          (GAS_STAT_SUCCESS == stat) ? "SUCCESS" : "FAIL");
      return;
    case GAS_OP_SOLVE_UPDATE_NOTIFICATION_STOP:
      GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
          "Solver notifies `%s' with result `%s'\n", "GAS_OP_SOLVE_UPDATE_NOTIFICATION_STOP",
          (GAS_STAT_SUCCESS == stat) ? "SUCCESS" : "FAIL");
      return;
    default:
      break;
    }
}

static void
solver_bandwidth_changed_cb (void *cls, struct ATS_Address *address)
{
  struct GNUNET_TIME_Relative duration;
  struct TestPeer *p;
  static struct PreferenceGenerator *pg;
  uint32_t delta;
  if ( (0 == address->assigned_bw_out) && (0 == address->assigned_bw_in) )
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Solver notified to disconnect peer `%s'\n",
                GNUNET_i2s (&address->peer));
  }
  p = find_peer_by_pid(&address->peer);
  if (NULL == p)
    return;
  p->assigned_bw_out = address->assigned_bw_out;
  p->assigned_bw_in = address->assigned_bw_in;

  for (pg = pref_gen_head; NULL != pg; pg = pg->next)
  {
    if (pg->peer == p->id)
    {
      duration = GNUNET_TIME_absolute_get_duration(pg->feedback_last_bw_update);
      delta = duration.rel_value_us * pg->last_assigned_bw_out;
      pg->feedback_bw_out_acc += delta;

      delta = duration.rel_value_us * pg->last_assigned_bw_in;
      pg->feedback_bw_in_acc += delta;

      pg->last_assigned_bw_in = address->assigned_bw_in;
      pg->last_assigned_bw_out = address->assigned_bw_out;
      pg->feedback_last_bw_update = GNUNET_TIME_absolute_get();
    }
  }

  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
      "Bandwidth changed addresses %s %p to %u Bps out / %u Bps in\n",
      GNUNET_i2s (&address->peer),
      address,
      address->assigned_bw_out,
          address->assigned_bw_in);

  if (NULL != l)
    GNUNET_ATS_solver_logging_now (l);

  return;
}

const double *
get_preferences_cb (void *cls, const struct GNUNET_PeerIdentity *id)
{
  struct TestPeer *p;
  if (GNUNET_YES == opt_disable_normalization)
  {
    if (NULL == (p = find_peer_by_pid (id)))
      return NULL;
    return p->pref_abs;
  }
  else
    return GAS_preference_get_by_peer (NULL,
                                       id);
}


struct SolverHandle *
GNUNET_ATS_solvers_solver_start (enum GNUNET_ATS_Solvers type)
{
  struct SolverHandle *sh;
  char * solver_str;

  switch (type) {
    case GNUNET_ATS_SOLVER_PROPORTIONAL:
      solver_str = "proportional";
      break;
    case GNUNET_ATS_SOLVER_MLP:
      solver_str = "mlp";
      break;
    case GNUNET_ATS_SOLVER_RIL:
      solver_str = "ril";
      break;
    default:
      GNUNET_break (0);
      return NULL;
      break;
  }

  sh = GNUNET_new (struct SolverHandle);
  GNUNET_asprintf (&sh->plugin,
                   "libgnunet_plugin_ats_%s",
                   solver_str);
  sh->addresses = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);

  /* setup environment */
  sh->env.cfg = e->cfg;
  sh->env.stats = GNUNET_STATISTICS_create ("ats", e->cfg);
  sh->env.addresses = sh->addresses;
  sh->env.bandwidth_changed_cb = &solver_bandwidth_changed_cb;
  sh->env.get_preferences = &get_preferences_cb;
  sh->env.network_count = GNUNET_ATS_NetworkTypeCount;
  sh->env.info_cb = &solver_info_cb;
  sh->env.network_count = GNUNET_ATS_NetworkTypeCount;

  /* start normalization */
  GAS_normalization_start ();

  /* load quotas */
  if (GNUNET_ATS_NetworkTypeCount != GNUNET_ATS_solvers_load_quotas (e->cfg,
      sh->env.out_quota, sh->env.in_quota, GNUNET_ATS_NetworkTypeCount))
  {
    GNUNET_break(0);
    GNUNET_free (sh->plugin);
    GNUNET_free (sh);
    end_now ();
    return NULL;
  }

  sh->sf = GNUNET_PLUGIN_load (sh->plugin, &sh->env);
  if (NULL == sh->sf)
  {
    fprintf (stderr, "Failed to load solver `%s'\n", sh->plugin);
    GNUNET_break(0);
    GNUNET_free (sh->plugin);
    GNUNET_free (sh);
    end_now ();
    return NULL;
  }
  return sh;
}


static void
done ()
{
  struct TestPeer *cur;
  struct TestPeer *next;

  struct TestAddress *cur_a;
  struct TestAddress *next_a;

  /* Stop logging */
  GNUNET_ATS_solver_logging_stop (l);

  /* Stop all preference generation */
  GNUNET_ATS_solver_generate_preferences_stop_all ();

  /* Stop all property generation */
  GNUNET_ATS_solver_generate_property_stop_all ();

  if (opt_print)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "== Printing log information \n");
    GNUNET_ATS_solver_logging_eval (l);
  }
  if (opt_save)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "== Saving log information \n");
    GNUNET_ATS_solver_logging_write_to_disk (l, e->log_append_time_stamp,
        e->log_output_dir);
  }

  if (NULL != l)
  {
    GNUNET_ATS_solver_logging_free (l);
    l = NULL;
  }

  /* Clean up experiment */
  if (NULL != e)
  {
    GNUNET_ATS_solvers_experimentation_stop (e);
    e = NULL;
  }

  next = peer_head;
  while  (NULL != (cur = next))
  {
    next = cur->next;
    GNUNET_CONTAINER_DLL_remove (peer_head, peer_tail, cur);
    next_a = cur->addr_head;
    while  (NULL != (cur_a = next_a))
    {
      next_a = cur_a->next;
      GNUNET_CONTAINER_DLL_remove (cur->addr_head, cur->addr_tail, cur_a);
      GNUNET_free (cur_a);
    }
    GNUNET_free (cur);
  }
  if (NULL != sh)
  {
    GNUNET_ATS_solvers_solver_stop (sh);
    sh = NULL;
  }

  /* Shutdown */
  end_now();
}

static void
experiment_done_cb (struct Experiment *e, struct GNUNET_TIME_Relative duration,int success)
{
  if (GNUNET_OK == success)
    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Experiment done successful in %s\n",
        GNUNET_STRINGS_relative_time_to_string (duration, GNUNET_YES));
  else
    GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Experiment failed \n");

  GNUNET_SCHEDULER_add_now (&done, NULL);
}

static void
episode_done_cb (struct Episode *ep)
{
  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Episode %u done\n", ep->id);
}



/**
 * Do shutdown
 */
static void
end_now ()
{
  if (NULL != e)
  {
    GNUNET_ATS_solvers_experimentation_stop (e);
    e = NULL;
  }
  if (NULL != sh)
  {
    GNUNET_ATS_solvers_solver_stop (sh);
    sh = NULL;
  }
}

static void
run (void *cls, char * const *args, const char *cfgfile,
    const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  enum GNUNET_ATS_Solvers solver;
  int c;

  if (NULL == opt_exp_file)
  {
    fprintf (stderr, "No experiment given ...\n");
    res = 1;
    end_now ();
    return;
  }

  if (NULL == opt_solver)
  {
    fprintf (stderr, "No solver given ...\n");
    res = 1;
    end_now ();
    return;
  }

  if (0 == strcmp(opt_solver, "mlp"))
  {
    solver = GNUNET_ATS_SOLVER_MLP;
  }
  else if (0 == strcmp(opt_solver, "proportional"))
  {
    solver = GNUNET_ATS_SOLVER_PROPORTIONAL;
  }
  else if (0 == strcmp(opt_solver, "ril"))
  {
    solver = GNUNET_ATS_SOLVER_RIL;
  }
  else
  {
    fprintf (stderr, "No solver given ...");
    res = 1;
    end_now ();
    return;
  }

  for (c = 0; c < GNUNET_ATS_PropertyCount; c++)
    default_properties[c] = DEFAULT_REL_QUALITY;

  for (c = 0; c < GNUNET_ATS_PreferenceCount; c++)
    default_preferences[c] = DEFAULT_REL_PREFERENCE;

  /* load experiment */
  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "=== Loading experiment\n");
  e = GNUNET_ATS_solvers_experimentation_load (opt_exp_file);
  if (NULL == e)
  {
    fprintf (stderr, "Failed to load experiment ...\n");
    res = 1;
    end_now ();
    return;
  }

  /* load solver */
  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "=== Loading solver\n");
  sh = GNUNET_ATS_solvers_solver_start (solver);
  if (NULL == sh)
  {
    fprintf (stderr, "Failed to start solver ...\n");
    end_now ();
    res = 1;
    return;
  }

  /* start logging */
  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "=== Start logging \n");
  l = GNUNET_ATS_solver_logging_start (e->log_freq);

  /* run experiment */
  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "=== Running experiment \n");
  GNUNET_ATS_solvers_experimentation_run (e, episode_done_cb,
      experiment_done_cb);

  /* WAIT */
}


/**
 * Main function of the benchmark
 *
 * @param argc argument count
 * @param argv argument values
 */
int
main (int argc, char *argv[])
{
  opt_exp_file = NULL;
  opt_solver = NULL;
  opt_log = GNUNET_NO;
  opt_save = GNUNET_NO;

  res = 0;

  static struct GNUNET_GETOPT_CommandLineOption options[] =
  {
    { 's', "solver", NULL,
        gettext_noop ("solver to use"),
        1, &GNUNET_GETOPT_set_string, &opt_solver},
    {  'e', "experiment", NULL,
      gettext_noop ("experiment to use"),
      1, &GNUNET_GETOPT_set_string, &opt_exp_file},
    {  'V', "verbose", NULL,
      gettext_noop ("be verbose"),
      0, &GNUNET_GETOPT_set_one, &opt_verbose},
    {  'p', "print", NULL,
      gettext_noop ("print logging"),
      0, &GNUNET_GETOPT_set_one, &opt_print},
    {  'f', "file", NULL,
        gettext_noop ("save logging to disk"),
        0, &GNUNET_GETOPT_set_one, &opt_save},
    {  'd', "dn", NULL,
        gettext_noop ("disable normalization"),
        0, &GNUNET_GETOPT_set_one, &opt_disable_normalization},
    GNUNET_GETOPT_OPTION_END
  };

  GNUNET_PROGRAM_run (argc, argv, "gnunet-ats-solver-eval",
      NULL, options, &run, argv[0]);

  return res;
}
/* end of file ats-testing-experiment.c*/