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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"
#define LOG(kind,...) GNUNET_log_from (kind, "sensor-analysis",__VA_ARGS__)
/*
* Carries information about the analysis model
* corresponding to one sensor
*/
struct SensorModel
{
/*
* Pointer to sensor info structure
*/
struct SensorInfo *sensor;
/*
* Watcher of sensor values
*/
struct GNUNET_PEERSTORE_WatchContext *wc;
};
/**
* 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;
/**
* Hashmap of loaded sensor definitions
*/
static struct GNUNET_CONTAINER_MultiHashMap *sensors;
/*
* Handle to peerstore service
*/
static struct GNUNET_PEERSTORE_Handle *peerstore;
/*
* Datatypes supported by the analysis component
*/
static const char *analysis_datatypes[] = { "uint64", "double", NULL };
/*
* MultiHashmap of all sensor models
*/
static struct GNUNET_CONTAINER_MultiHashMap *sensor_models;
/*
* TODO: document
*/
void SENSOR_analysis_stop()
{
if (NULL != model)
{
GNUNET_break (NULL == GNUNET_PLUGIN_unload (model_lib_name, model));
GNUNET_free (model_lib_name);
model_lib_name = NULL;
}
if (NULL != peerstore)
{
GNUNET_PEERSTORE_disconnect(peerstore);
peerstore = NULL;
}
if (NULL != sensor_models)
{
/* TODO: iterate over sensor models and destroy */
GNUNET_CONTAINER_multihashmap_destroy(sensor_models);
sensor_models = NULL;
}
}
/*
* TODO: document
*/
static int
sensor_watcher (void *cls,
struct GNUNET_PEERSTORE_Record *record,
char *emsg)
{
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Received a sensor value, will feed to sensor model.\n");
return GNUNET_YES;
}
/*
* TODO: document
*/
static int
init_sensor_model (void *cls,
const struct GNUNET_HashCode *key,
void *value)
{
struct SensorInfo *sensor = value;
struct SensorModel *sensor_model;
int is_numeric;
int i;
is_numeric = GNUNET_NO;
for (i = 0; NULL != analysis_datatypes[i]; i++)
{
if (0 == strcasecmp (analysis_datatypes[i], sensor->expected_datatype))
{
is_numeric = GNUNET_YES;
break;
}
}
if (GNUNET_NO == is_numeric)
return GNUNET_YES;
sensor_model = GNUNET_new(struct SensorModel);
sensor_model->wc = GNUNET_PEERSTORE_watch(peerstore,
"sensor", NULL, sensor->name,
&sensor_watcher, sensor_model);
GNUNET_CONTAINER_multihashmap_put(sensor_models, key,
sensor_model, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
return GNUNET_YES;
}
/*
* TODO: document
*
* @return #GNUNET_OK if started successfully, #GNUNET_SYSERR otherwise
*/
int
SENSOR_analysis_start(const struct GNUNET_CONFIGURATION_Handle *c,
struct GNUNET_CONTAINER_MultiHashMap *sensors_mhm)
{
char *model_name;
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 = GNUNET_PLUGIN_load(model_lib_name, (void *) cfg);
GNUNET_free(model_name);
if(NULL == model)
{
LOG (GNUNET_ERROR_TYPE_ERROR, _("Could not load analysis model `%s'.\n"), model_lib_name);
return GNUNET_SYSERR;
}
sensors = sensors_mhm;
if (NULL == sensors)
{
LOG (GNUNET_ERROR_TYPE_ERROR, _("Tried to start analysis before loading sensors.\n"));
SENSOR_analysis_stop();
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;
}
sensor_models = GNUNET_CONTAINER_multihashmap_create(10, GNUNET_NO);
GNUNET_CONTAINER_multihashmap_iterate(sensors, &init_sensor_model, NULL);
return GNUNET_OK;
}
/* end of gnunet-service-sensor-analysis.c */
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