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/*
This file is part of GNUnet.
(C)
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 sensor/gnunet-service-sensor-analysis.c
* @brief sensor service analysis functionality
* @author Omar Tarabai
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "sensor.h"
#include "gnunet_peerstore_service.h"
#include "gnunet_sensor_model_plugin.h"
#define LOG(kind,...) GNUNET_log_from (kind, "sensor-analysis",__VA_ARGS__)
/*
* Carries information about the analysis model
* corresponding to one sensor
*/
struct SensorModel
{
/*
* DLL
*/
struct SensorModel *prev;
/*
* DLL
*/
struct SensorModel *next;
/*
* Pointer to sensor info structure
*/
struct SensorInfo *sensor;
/*
* Watcher of sensor values
*/
struct GNUNET_PEERSTORE_WatchContext *wc;
/*
* Closure for model plugin
*/
void *cls;
};
/**
* Our configuration.
*/
static const struct GNUNET_CONFIGURATION_Handle *cfg;
/*
* Model library name
*/
static char *model_lib_name;
/*
* Model handle
*/
static struct GNUNET_SENSOR_ModelFunctions *model_api;
/*
* Handle to peerstore service
*/
static struct GNUNET_PEERSTORE_Handle *peerstore;
/*
* Head of DLL of created models
*/
static struct SensorModel *models_head;
/*
* Tail of DLL of created models
*/
static struct SensorModel *models_tail;
/**
* My peer id
*/
struct GNUNET_PeerIdentity peerid;
/*
* Destroy a created model
*/
static void
destroy_sensor_model (struct SensorModel *sensor_model)
{
GNUNET_assert (NULL != sensor_model);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Destroying sensor model for `%s'.\n",
sensor_model->sensor->name);
if (NULL != sensor_model->wc)
{
GNUNET_PEERSTORE_watch_cancel(sensor_model->wc);
sensor_model->wc = NULL;
}
if (NULL != sensor_model->cls)
{
model_api->destroy_model (sensor_model->cls);
sensor_model->cls = NULL;
}
GNUNET_free(sensor_model);
sensor_model = NULL;
}
/*
* Stop the sensor analysis module
*/
void SENSOR_analysis_stop()
{
struct SensorModel *sm;
LOG (GNUNET_ERROR_TYPE_DEBUG, "Stopping sensor analysis module.\n");
while (NULL != models_head)
{
sm = models_head;
GNUNET_CONTAINER_DLL_remove(models_head, models_tail, sm);
destroy_sensor_model(sm);
}
if (NULL != peerstore)
{
GNUNET_PEERSTORE_disconnect(peerstore, GNUNET_YES);
peerstore = NULL;
}
if (NULL != model_api)
{
GNUNET_break (NULL == GNUNET_PLUGIN_unload (model_lib_name, model_api));
GNUNET_free (model_lib_name);
model_lib_name = NULL;
}
}
/*
* Sensor value watch callback
*/
static int
sensor_watcher (void *cls,
struct GNUNET_PEERSTORE_Record *record,
char *emsg)
{
struct SensorModel *sensor_model = cls;
double *val;
int anomalous;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Received a sensor value, will feed to sensor model.\n");
if (sizeof(double) != record->value_size)
{
LOG (GNUNET_ERROR_TYPE_ERROR,
_("Received an invalid sensor value."));
return GNUNET_YES;
}
val = (double *)(record->value);
anomalous = model_api->feed_model (sensor_model->cls, *val);
if (GNUNET_YES == anomalous)
{
LOG (GNUNET_ERROR_TYPE_WARNING,
"Anomaly detected in sensor `%s', value: %f.\n",
sensor_model->sensor->name, *val);
}
else
LOG (GNUNET_ERROR_TYPE_DEBUG, "Value non-anomalous.\n");
return GNUNET_YES;
}
/*
* Iterator for defined sensors
* Creates sensor model for numeric sensors
*
* @param cls unused
* @param key unused
* @param value a 'struct SensorInfo *' with sensor information
* @return #GNUNET_YES to continue iterations
*/
static int
init_sensor_model (void *cls,
const struct GNUNET_HashCode *key,
void *value)
{
struct SensorInfo *sensor = value;
struct SensorModel *sensor_model;
if (0 != strcmp("numeric", sensor->expected_datatype))
return GNUNET_YES;
sensor_model = GNUNET_new(struct SensorModel);
sensor_model->sensor = sensor;
sensor_model->wc = GNUNET_PEERSTORE_watch(peerstore,
"sensor", &peerid, sensor->name,
&sensor_watcher, sensor_model);
sensor_model->cls = model_api->create_model(model_api->cls);
GNUNET_CONTAINER_DLL_insert(models_head, models_tail, sensor_model);
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Created sensor model for `%s'.\n", sensor->name);
return GNUNET_YES;
}
/*
* Start the sensor analysis module
*
* @param c our service configuration
* @param sensors multihashmap of loaded sensors
* @return #GNUNET_OK if started successfully, #GNUNET_SYSERR otherwise
*/
int
SENSOR_analysis_start(const struct GNUNET_CONFIGURATION_Handle *c,
struct GNUNET_CONTAINER_MultiHashMap *sensors)
{
char *model_name;
GNUNET_assert(NULL != sensors);
cfg = c;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (cfg, "sensor-analysis", "MODEL",
&model_name))
{
LOG (GNUNET_ERROR_TYPE_ERROR, _("Analysis model not defined in configuration.\n"));
return GNUNET_SYSERR;
}
GNUNET_asprintf (&model_lib_name, "libgnunet_plugin_sensor_model_%s", model_name);
model_api = GNUNET_PLUGIN_load(model_lib_name, (void *) cfg);
GNUNET_free(model_name);
if(NULL == model_api)
{
LOG (GNUNET_ERROR_TYPE_ERROR, _("Could not load analysis model `%s'.\n"), model_lib_name);
return GNUNET_SYSERR;
}
peerstore = GNUNET_PEERSTORE_connect(cfg);
if (NULL == peerstore)
{
LOG (GNUNET_ERROR_TYPE_ERROR, _("Could not connect to peerstore service.\n"));
SENSOR_analysis_stop();
return GNUNET_SYSERR;
}
GNUNET_CRYPTO_get_peer_identity(cfg, &peerid);
GNUNET_CONTAINER_multihashmap_iterate(sensors, &init_sensor_model, NULL);
return GNUNET_OK;
}
/* end of gnunet-service-sensor-analysis.c */
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