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6 it under the terms of the GNU General Public License as published
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
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22 * @file sensor/sensor_util_lib.c
23 * @brief senor utilities
24 * @author Omar Tarabai
28 #include "gnunet_util_lib.h"
29 #include "gnunet_sensor_util_lib.h"
31 #define LOG(kind,...) GNUNET_log_from (kind, "sensor-util",__VA_ARGS__)
34 * Minimum sensor execution interval (in seconds)
36 #define MIN_INTERVAL 30
39 * Supported sources of sensor information
41 static const char *sources[] = { "gnunet-statistics", "process", NULL };
44 * Supported datatypes of sensor information
46 static const char *datatypes[] = { "numeric", "string", NULL };
49 * Parses a version number string into major and minor
51 * @param version full version string
52 * @param major pointer to parsed major value
53 * @param minor pointer to parsed minor value
54 * @return #GNUNET_OK if parsing went ok, #GNUNET_SYSERROR in case of error
57 version_parse(char *version, uint16_t *major, uint16_t *minor)
62 for(; isdigit(*version); version++)
65 majorval += *version - '0';
70 for(; isdigit(*version); version++)
73 minorval += *version - '0';
84 * Load sensor definition from configuration
86 * @param cfg configuration handle
87 * @param sectionname configuration section containing definition
89 static struct SensorInfo *
90 load_sensor_from_cfg(struct GNUNET_CONFIGURATION_Handle *cfg, const char *sectionname)
92 struct SensorInfo *sensor;
96 unsigned long long time_sec;
98 struct GNUNET_CRYPTO_EddsaPublicKey public_key;
100 sensor = GNUNET_new(struct SensorInfo);
102 sensor->name = GNUNET_strdup(sectionname);
104 if(GNUNET_OK != GNUNET_CONFIGURATION_get_value_string(cfg, sectionname, "VERSION", &version_str))
106 LOG (GNUNET_ERROR_TYPE_ERROR, _("Error reading sensor version\n"));
110 if(GNUNET_OK != version_parse(version_str, &(sensor->version_major), &(sensor->version_minor)))
112 LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid sensor version number, format should be major.minor\n"));
114 GNUNET_free(version_str);
117 GNUNET_free(version_str);
119 GNUNET_CONFIGURATION_get_value_string(cfg, sectionname, "DESCRIPTION", &sensor->description);
121 if(GNUNET_OK != GNUNET_CONFIGURATION_get_value_string(cfg, sectionname, "CATEGORY", &sensor->category) ||
122 NULL == sensor->category)
124 LOG (GNUNET_ERROR_TYPE_ERROR, _("Error reading sensor category\n"));
129 if(GNUNET_NO == GNUNET_CONFIGURATION_get_value_yesno(cfg, sectionname, "ENABLED"))
130 sensor->enabled = GNUNET_NO;
132 sensor->enabled = GNUNET_YES;
134 sensor->start_time = NULL;
135 if(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, sectionname, "START_TIME", &starttime_str))
137 GNUNET_STRINGS_fancy_time_to_absolute(starttime_str, sensor->start_time);
138 LOG (GNUNET_ERROR_TYPE_DEBUG, "Start time loaded: `%s'. Parsed: %d\n", starttime_str, (NULL != sensor->start_time));
139 GNUNET_free(starttime_str);
142 sensor->end_time = NULL;
143 if(GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, sectionname, "END_TIME", &endtime_str))
145 GNUNET_STRINGS_fancy_time_to_absolute(endtime_str, sensor->end_time);
146 LOG (GNUNET_ERROR_TYPE_DEBUG, "End time loaded: `%s'. Parsed: %d\n", endtime_str, (NULL != sensor->end_time));
147 GNUNET_free(endtime_str);
150 if(GNUNET_OK != GNUNET_CONFIGURATION_get_value_number(cfg, sectionname, "INTERVAL", &time_sec))
152 LOG (GNUNET_ERROR_TYPE_ERROR, _("Error reading sensor run interval\n"));
156 if(time_sec < MIN_INTERVAL)
158 LOG (GNUNET_ERROR_TYPE_ERROR, _("Sensor run interval too low (%" PRIu64 " < %d)\n"),
159 time_sec, MIN_INTERVAL);
163 sensor->interval = GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, time_sec);
165 if(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, sectionname, "LIFETIME", &time_sec))
167 sensor->lifetime = GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, time_sec);
168 if (sensor->lifetime.rel_value_us < sensor->interval.rel_value_us)
169 LOG (GNUNET_ERROR_TYPE_WARNING,
170 "Lifetime of sensor data is preferred to be higher than interval for sensor `%s'.\n",
174 sensor->lifetime = sensor->interval;
177 if(GNUNET_OK != GNUNET_CONFIGURATION_get_value_choice(cfg, sectionname, "SOURCE", sources, (const char **)&sensor->source))
179 LOG (GNUNET_ERROR_TYPE_ERROR, _("Error reading sensor source\n"));
183 if(sources[0] == sensor->source) //gnunet-statistics
185 if(GNUNET_OK != GNUNET_CONFIGURATION_get_value_string(cfg, sectionname, "GNUNET_STAT_SERVICE", &sensor->gnunet_stat_service) ||
186 GNUNET_OK != GNUNET_CONFIGURATION_get_value_string(cfg, sectionname, "GNUNET_STAT_NAME", &sensor->gnunet_stat_name))
188 LOG (GNUNET_ERROR_TYPE_ERROR, _("Error reading sensor gnunet-statistics source information\n"));
192 sensor->gnunet_stat_get_handle = NULL;
194 else if(sources[1] == sensor->source) //process
196 if(GNUNET_OK != GNUNET_CONFIGURATION_get_value_string(cfg, sectionname, "EXT_PROCESS", &sensor->ext_process))
198 LOG (GNUNET_ERROR_TYPE_ERROR, _("Error reading sensor process name\n"));
202 GNUNET_CONFIGURATION_get_value_string(cfg, sectionname, "EXT_ARGS", &sensor->ext_args);
205 if(GNUNET_OK != GNUNET_CONFIGURATION_get_value_choice(cfg, sectionname, "EXPECTED_DATATYPE", datatypes, (const char **)&sensor->expected_datatype))
207 LOG (GNUNET_ERROR_TYPE_ERROR, _("Error reading sensor expected datatype\n"));
211 if(sources[0] == sensor->source && datatypes[0] != sensor->expected_datatype)
213 LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid expected datatype, gnunet-statistics returns uint64 values\n"));
217 //reporting mechanism
218 if (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string(cfg, sectionname, "COLLECTION_POINT", &dummy))
220 if(GNUNET_OK != GNUNET_CONFIGURATION_get_value_number(cfg, sectionname, "COLLECTION_INTERVAL", &time_sec))
222 LOG (GNUNET_ERROR_TYPE_ERROR, _("Error reading sensor collection interval\n"));
226 sensor->collection_interval = GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, time_sec);
227 if (GNUNET_OK == GNUNET_CRYPTO_eddsa_public_key_from_string(dummy, strlen(dummy), &public_key))
229 sensor->collection_point = GNUNET_new(struct GNUNET_PeerIdentity);
230 sensor->collection_point->public_key = public_key;
234 sensor->p2p_report = GNUNET_NO;
235 if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno(cfg, sectionname, "P2P_REPORT"))
237 if(GNUNET_OK != GNUNET_CONFIGURATION_get_value_number(cfg, sectionname, "P2P_INTERVAL", &time_sec))
239 LOG (GNUNET_ERROR_TYPE_ERROR, _("Error reading sensor p2p reporting interval\n"));
243 sensor->p2p_interval = GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, time_sec);
244 sensor->p2p_report = GNUNET_YES;
248 sensor->execution_task = GNUNET_SCHEDULER_NO_TASK;
250 sensor->running = GNUNET_NO;
256 * Load sensor definition from file
258 * @param filename full path to file containing sensor definition
260 static struct SensorInfo *
261 load_sensor_from_file(const char *filename)
263 struct GNUNET_CONFIGURATION_Handle *sensorcfg;
264 const char *filebasename;
265 struct SensorInfo *sensor;
268 if(GNUNET_YES != GNUNET_DISK_file_test(filename))
270 LOG (GNUNET_ERROR_TYPE_ERROR, _("Failed to access sensor file: %s\n"), filename);
273 //load file as configuration
274 sensorcfg = GNUNET_CONFIGURATION_create();
275 if(GNUNET_SYSERR == GNUNET_CONFIGURATION_parse(sensorcfg, filename))
277 GNUNET_CONFIGURATION_destroy(sensorcfg);
278 LOG (GNUNET_ERROR_TYPE_ERROR, _("Failed to load sensor definition: %s\n"), filename);
281 //configuration section should be the same as filename
282 filebasename = GNUNET_STRINGS_get_short_name(filename);
283 sensor = load_sensor_from_cfg(sensorcfg, filebasename);
286 GNUNET_CONFIGURATION_destroy(sensorcfg);
289 sensor->def_file = GNUNET_strdup(filename);
290 sensor->cfg = sensorcfg;
296 * Compares version numbers of two sensors
298 * @param s1 first sensor
299 * @param s2 second sensor
300 * @return 1: s1 > s2, 0: s1 == s2, -1: s1 < s2
303 sensor_version_compare(struct SensorInfo *s1, struct SensorInfo *s2)
305 if(s1->version_major == s2->version_major)
306 return (s1->version_minor < s2->version_minor) ? -1 : (s1->version_minor > s2->version_minor);
308 return (s1->version_major < s2->version_major) ? -1 : (s1->version_major > s2->version_major);
312 * Adds a new sensor to given hashmap.
313 * If the same name exist, compares versions and update if old.
315 * @param sensor Sensor structure to add
316 * @param map Hashmap to add to
317 * @return #GNUNET_YES if added, #GNUNET_NO if not added which is not necessarily an error
320 add_sensor_to_hashmap(struct SensorInfo *sensor, struct GNUNET_CONTAINER_MultiHashMap *map)
322 struct GNUNET_HashCode key;
323 struct SensorInfo *existing;
325 GNUNET_CRYPTO_hash(sensor->name, strlen(sensor->name), &key);
326 existing = GNUNET_CONTAINER_multihashmap_get(map, &key);
327 if(NULL != existing) //sensor with same name already exists
329 if(sensor_version_compare(existing, sensor) >= 0) //same or newer version already exist
331 LOG (GNUNET_ERROR_TYPE_INFO, _("Sensor `%s' already exists with same or newer version\n"), sensor->name);
336 GNUNET_CONTAINER_multihashmap_remove(map, &key, existing); //remove the old version
337 GNUNET_free(existing);
338 LOG (GNUNET_ERROR_TYPE_INFO, "Upgrading sensor `%s' to a newer version\n", sensor->name);
341 if(GNUNET_SYSERR == GNUNET_CONTAINER_multihashmap_put(map, &key, sensor, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
343 LOG (GNUNET_ERROR_TYPE_ERROR, _("Error adding new sensor `%s' to global hashmap, this should not happen\n"), sensor->name);
351 * Iterating over files in sensors directory
354 * @param filename complete filename (absolute path)
355 * @return #GNUNET_OK to continue to iterate
358 reload_sensors_dir_cb(void *cls, const char *filename)
360 struct GNUNET_CONTAINER_MultiHashMap *sensors = cls;
361 struct SensorInfo *sensor;
363 if(GNUNET_YES != GNUNET_DISK_file_test(filename))
365 sensor = load_sensor_from_file(filename);
368 LOG (GNUNET_ERROR_TYPE_ERROR,
369 _("Error loading sensor from file: %s\n"), filename);
372 if(GNUNET_YES == add_sensor_to_hashmap(sensor, sensors))
373 LOG (GNUNET_ERROR_TYPE_DEBUG,
374 "Sensor `%s' added to global hashmap\n", sensor->name);
376 LOG (GNUNET_ERROR_TYPE_WARNING,
377 "Could not add sensor `%s' to global hashmap\n", sensor->name);
383 * Get path to the directory containing the sensor definition files
385 * @return sensor files directory
388 GNUNET_SENSOR_get_sensor_dir ()
393 datadir = GNUNET_OS_installation_get_path(GNUNET_OS_IPK_DATADIR);
394 GNUNET_asprintf(&sensordir, "%ssensors%s",
395 datadir, DIR_SEPARATOR_STR);
396 GNUNET_free(datadir);
402 * Reads sensor definitions from local data files
404 * @return a multihashmap of loaded sensors
406 struct GNUNET_CONTAINER_MultiHashMap *
407 GNUNET_SENSOR_load_all_sensors ()
410 struct GNUNET_CONTAINER_MultiHashMap *sensors;
412 sensors = GNUNET_CONTAINER_multihashmap_create(10, GNUNET_NO);
413 sensordir = GNUNET_SENSOR_get_sensor_dir ();
414 LOG (GNUNET_ERROR_TYPE_INFO,
415 "Loading sensor definitions from directory `%s'\n", sensordir);
416 GNUNET_assert(GNUNET_YES == GNUNET_DISK_directory_test(sensordir, GNUNET_YES));
418 //read all files in sensors directory
419 GNUNET_DISK_directory_scan(sensordir, &reload_sensors_dir_cb, sensors);
420 LOG (GNUNET_ERROR_TYPE_INFO, "Loaded %d sensors from directory `%s'\n",
421 GNUNET_CONTAINER_multihashmap_size(sensors), sensordir);
422 GNUNET_free(sensordir);