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/*
This file is part of GNUnet.
(C) 2009 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 experimentation/gnunet-daemon-experimentation_scheduler.c
* @brief experimentation daemon: execute experiments
* @author Christian Grothoff
* @author Matthias Wachs
*/
#include "platform.h"
#include "gnunet_getopt_lib.h"
#include "gnunet_util_lib.h"
#include "gnunet_core_service.h"
#include "gnunet_statistics_service.h"
#include "gnunet-daemon-experimentation.h"
enum ExperimentState
{
NOT_RUNNING,
REQUESTED,
STARTED,
STOPPED
};
struct ScheduledExperiment {
struct ScheduledExperiment *next;
struct ScheduledExperiment *prev;
struct Experiment *e;
struct Node *n;
int state;
GNUNET_SCHEDULER_TaskIdentifier task;
};
struct ScheduledExperiment *list_head;
struct ScheduledExperiment *list_tail;
static unsigned int experiments_scheduled;
static unsigned int experiments_requested;
static void
request_timeout (void *cls,const struct GNUNET_SCHEDULER_TaskContext* tc)
{
struct ScheduledExperiment *se = cls;
se->task = GNUNET_SCHEDULER_NO_TASK;
GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Peer `%s' did not respond to request for experiment `%s'\n",
GNUNET_i2s (&se->n->id), se->e->name);
GNUNET_CONTAINER_DLL_remove (list_head, list_tail, se);
GNUNET_free (se);
/* Remove experiment */
GNUNET_assert (experiments_requested > 0);
experiments_requested --;
GNUNET_STATISTICS_set (GSE_stats, "# experiments requested", experiments_requested, GNUNET_NO);
}
static void run (void *cls,const struct GNUNET_SCHEDULER_TaskContext* tc)
{
struct ScheduledExperiment *se = cls;
struct GNUNET_TIME_Relative end;
se->task = GNUNET_SCHEDULER_NO_TASK;
if (NOT_RUNNING == se->state)
{
/* Send start message */
GNUNET_EXPERIMENT_nodes_request_start (se->n, se->e);
se->state = REQUESTED;
se->task = GNUNET_SCHEDULER_add_delayed (EXP_RESPONSE_TIMEOUT, &request_timeout, se);
GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Sending start request to peer `%s' for `%s'\n",
GNUNET_i2s (&se->n->id), se->e->name);
experiments_requested ++;
GNUNET_STATISTICS_set (GSE_stats, "# experiments requested", experiments_requested, GNUNET_NO);
return;
}
else if (REQUESTED == se->state)
{
/* Already requested */
return;
}
else if (STARTED == se->state)
{
/* Experiment is running */
GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Running experiment `%s' peer for `%s'\n",
GNUNET_i2s (&se->n->id), se->e->name);
/* do work here */
/* Reschedule */
end = GNUNET_TIME_absolute_get_remaining(GNUNET_TIME_absolute_add (se->e->stop, se->e->frequency));
if (0 == end.rel_value)
{
se->state = STOPPED;
return; /* End of experiment is reached */
}
se->task = GNUNET_SCHEDULER_add_delayed (se->e->frequency, &run, se);
}
else if (STOPPED == se->state)
{
/* Experiment expired */
}
}
/**
* Start the scheduler component
*/
void
GNUNET_EXPERIMENTATION_scheduler_add (struct Node *n, struct Experiment *e)
{
struct ScheduledExperiment *se;
struct GNUNET_TIME_Relative start;
struct GNUNET_TIME_Relative end;
start = GNUNET_TIME_absolute_get_remaining(e->start);
end = GNUNET_TIME_absolute_get_remaining(e->stop);
if (0 == end.rel_value)
return; /* End of experiment is reached */
/* Add additional checks here if required */
se = GNUNET_malloc (sizeof (struct ScheduledExperiment));
se->state = NOT_RUNNING;
se->e = e;
se->n = n;
if (0 == start.rel_value)
se->task = GNUNET_SCHEDULER_add_now (&run, se);
else
se->task = GNUNET_SCHEDULER_add_delayed (start, &run, se);
GNUNET_CONTAINER_DLL_insert (list_head, list_tail, se);
GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Added experiment `%s' for node to be scheduled\n",
e->name, GNUNET_i2s(&se->n->id));
experiments_scheduled ++;
GNUNET_STATISTICS_set (GSE_stats, "# experiments scheduled", experiments_scheduled, GNUNET_NO);
}
/**
* Start the scheduler component
*/
void
GNUNET_EXPERIMENTATION_scheduler_start ()
{
experiments_requested = 0;
experiments_scheduled = 0;
}
/**
* Stop the scheduler component
*/
void
GNUNET_EXPERIMENTATION_scheduler_stop ()
{
struct ScheduledExperiment *cur;
struct ScheduledExperiment *next;
next = list_head;
while (NULL != (cur = next))
{
next = cur->next;
GNUNET_CONTAINER_DLL_remove (list_head, list_tail, cur);
if (GNUNET_SCHEDULER_NO_TASK != cur->task)
{
GNUNET_SCHEDULER_cancel (cur->task);
cur->task = GNUNET_SCHEDULER_NO_TASK;
}
GNUNET_free (cur);
GNUNET_assert (experiments_scheduled > 0);
experiments_scheduled --;
GNUNET_STATISTICS_set (GSE_stats, "# experiments scheduled", experiments_scheduled, GNUNET_NO);
}
}
/* end of gnunet-daemon-experimentation_scheduler.c */
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