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22 * @file sensor/gnunet-service-sensor_analysis.c
23 * @brief sensor service analysis functionality
24 * @author Omar Tarabai
27 #include "gnunet_util_lib.h"
29 #include "gnunet_peerstore_service.h"
30 #include "gnunet_sensor_model_plugin.h"
32 #define LOG(kind,...) GNUNET_log_from (kind, "sensor-analysis",__VA_ARGS__)
35 * Carries information about the analysis model
36 * corresponding to one sensor
44 struct SensorModel *prev;
49 struct SensorModel *next;
52 * Pointer to sensor info structure
54 struct GNUNET_SENSOR_SensorInfo *sensor;
57 * Watcher of sensor values
59 struct GNUNET_PEERSTORE_WatchContext *wc;
62 * State of sensor. #GNUNET_YES if anomalous, #GNUNET_NO otherwise.
67 * Number of anomalous readings (positive) received in a row.
72 * Number of non-anomalous (negative) readings received in a row.
77 * Closure for model plugin.
78 * Usually, the instance of the model created for this sensor.
87 static const struct GNUNET_CONFIGURATION_Handle *cfg;
92 static char *model_lib_name;
97 static struct GNUNET_SENSOR_ModelFunctions *model_api;
100 * Handle to peerstore service
102 static struct GNUNET_PEERSTORE_Handle *peerstore;
105 * Head of DLL of created models
107 static struct SensorModel *models_head;
110 * Tail of DLL of created models
112 static struct SensorModel *models_tail;
117 struct GNUNET_PeerIdentity peerid;
120 * How many subsequent values required to flip anomaly label.
121 * E.g. After 3 subsequent anomaly reports, status change to anomalous.
123 unsigned long long confirmation_count;
126 * Destroy a created model
129 destroy_sensor_model (struct SensorModel *sensor_model)
131 GNUNET_assert (NULL != sensor_model);
132 LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying sensor model for `%s'.\n",
133 sensor_model->sensor->name);
134 if (NULL != sensor_model->wc)
136 GNUNET_PEERSTORE_watch_cancel (sensor_model->wc);
137 sensor_model->wc = NULL;
139 if (NULL != sensor_model->cls)
141 model_api->destroy_model (sensor_model->cls);
142 sensor_model->cls = NULL;
144 GNUNET_free (sensor_model);
150 * Stop the sensor analysis module
153 SENSOR_analysis_stop ()
155 struct SensorModel *sm;
157 LOG (GNUNET_ERROR_TYPE_DEBUG, "Stopping sensor analysis module.\n");
158 while (NULL != models_head)
161 GNUNET_CONTAINER_DLL_remove (models_head, models_tail, sm);
162 destroy_sensor_model (sm);
164 if (NULL != peerstore)
166 GNUNET_PEERSTORE_disconnect (peerstore, GNUNET_YES);
169 if (NULL != model_api)
171 GNUNET_break (NULL == GNUNET_PLUGIN_unload (model_lib_name, model_api));
172 GNUNET_free (model_lib_name);
173 model_lib_name = NULL;
179 * Sensor value watch callback
181 * @param cls Sensor model struct
182 * @param record Received record from peerstore, should contain new sensor value
183 * @param emsg Error message from peerstore if any, NULL if no errors
184 * @return #GNUNET_YES
187 sensor_watcher (void *cls, struct GNUNET_PEERSTORE_Record *record, char *emsg)
189 struct SensorModel *model = cls;
193 LOG (GNUNET_ERROR_TYPE_DEBUG,
194 "Received a sensor value, will feed to sensor model.\n");
195 if (sizeof (double) != record->value_size)
197 LOG (GNUNET_ERROR_TYPE_ERROR, _("Received an invalid sensor value."));
200 val = (double *) (record->value);
201 anomalous = model_api->feed_model (model->cls, *val);
202 if (GNUNET_YES == anomalous)
204 model->positive_count++;
205 model->negative_count = 0;
206 if (GNUNET_NO == model->anomalous &&
207 model->positive_count >= confirmation_count)
209 model->anomalous = GNUNET_YES;
210 LOG (GNUNET_ERROR_TYPE_WARNING,
211 "Anomaly state started for sensor `%s'.\n", model->sensor->name);
212 SENSOR_reporting_anomaly_update (model->sensor, model->anomalous);
217 model->negative_count++;
218 model->positive_count = 0;
219 if (GNUNET_YES == model->anomalous &&
220 model->negative_count >= confirmation_count)
222 model->anomalous = GNUNET_NO;
223 LOG (GNUNET_ERROR_TYPE_INFO, "Anomaly state stopped for sensor `%s'.\n",
224 model->sensor->name);
225 SENSOR_reporting_anomaly_update (model->sensor, model->anomalous);
233 * Iterator for defined sensors
234 * Creates sensor model for numeric sensors
238 * @param value a 'struct GNUNET_SENSOR_SensorInfo *' with sensor information
239 * @return #GNUNET_YES to continue iterations
242 init_sensor_model (void *cls, const struct GNUNET_HashCode *key, void *value)
244 struct GNUNET_SENSOR_SensorInfo *sensor = value;
245 struct SensorModel *sensor_model;
247 if (0 != strcmp ("numeric", sensor->expected_datatype))
249 sensor_model = GNUNET_new (struct SensorModel);
250 sensor_model->sensor = sensor;
252 GNUNET_PEERSTORE_watch (peerstore, "sensor", &peerid, sensor->name,
253 &sensor_watcher, sensor_model);
254 sensor_model->anomalous = GNUNET_NO;
255 sensor_model->positive_count = 0;
256 sensor_model->negative_count = 0;
257 sensor_model->cls = model_api->create_model (model_api->cls);
258 GNUNET_CONTAINER_DLL_insert (models_head, models_tail, sensor_model);
259 LOG (GNUNET_ERROR_TYPE_DEBUG, "Created sensor model for `%s'.\n",
266 * Start the sensor analysis module
268 * @param c our service configuration
269 * @param sensors multihashmap of loaded sensors
270 * @return #GNUNET_OK if started successfully, #GNUNET_SYSERR otherwise
273 SENSOR_analysis_start (const struct GNUNET_CONFIGURATION_Handle *c,
274 struct GNUNET_CONTAINER_MultiHashMap *sensors)
278 GNUNET_assert (NULL != sensors);
281 GNUNET_CONFIGURATION_get_value_string (cfg, "sensor-analysis", "MODEL",
284 LOG (GNUNET_ERROR_TYPE_ERROR,
285 _("Analysis model not defined in configuration.\n"));
286 return GNUNET_SYSERR;
288 GNUNET_asprintf (&model_lib_name, "libgnunet_plugin_sensor_model_%s",
290 model_api = GNUNET_PLUGIN_load (model_lib_name, (void *) cfg);
291 GNUNET_free (model_name);
292 if (NULL == model_api)
294 LOG (GNUNET_ERROR_TYPE_ERROR, _("Could not load analysis model `%s'.\n"),
296 return GNUNET_SYSERR;
298 peerstore = GNUNET_PEERSTORE_connect (cfg);
299 if (NULL == peerstore)
301 LOG (GNUNET_ERROR_TYPE_ERROR,
302 _("Could not connect to peerstore service.\n"));
303 SENSOR_analysis_stop ();
304 return GNUNET_SYSERR;
307 GNUNET_CONFIGURATION_get_value_number (cfg, "sensor-analysis",
308 "CONFIRMATION_COUNT",
309 &confirmation_count))
310 confirmation_count = 1;
311 GNUNET_CRYPTO_get_peer_identity (cfg, &peerid);
312 GNUNET_CONTAINER_multihashmap_iterate (sensors, &init_sensor_model, NULL);
316 /* end of gnunet-service-sensor_analysis.c */