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22 * @file peerstore/gnunet-service-peerstore.c
23 * @brief peerstore service implementation
24 * @author Omar Tarabai
27 #include "gnunet_util_lib.h"
28 #include "peerstore.h"
29 #include "gnunet_peerstore_plugin.h"
30 #include "peerstore_common.h"
33 * Context of a PEERSTORE watch
39 * Hash of key of watched record
41 struct GNUNET_HashCode keyhash;
44 * Client requested the watch
46 struct GNUNET_SERVER_Client *client;
51 * Interval for expired records cleanup (in seconds)
53 #define CLEANUP_INTERVAL 300 /* 5mins */
58 static const struct GNUNET_CONFIGURATION_Handle *cfg;
61 * Database plugin library name
68 static struct GNUNET_PEERSTORE_PluginFunctions *db;
71 * Hashmap with all watch requests
73 static struct GNUNET_CONTAINER_MultiHashMap *watchers;
76 * Our notification context.
78 static struct GNUNET_SERVER_NotificationContext *nc;
81 * Task run during shutdown.
87 shutdown_task (void *cls,
88 const struct GNUNET_SCHEDULER_TaskContext *tc)
90 if(NULL != db_lib_name)
92 GNUNET_break (NULL == GNUNET_PLUGIN_unload (db_lib_name, db));
93 GNUNET_free (db_lib_name);
96 GNUNET_SERVER_notification_context_destroy(nc);
97 GNUNET_CONTAINER_multihashmap_destroy(watchers);
98 GNUNET_SCHEDULER_shutdown();
102 * Deletes any expired records from storage
105 cleanup_expired_records(void *cls,
106 const struct GNUNET_SCHEDULER_TaskContext *tc)
110 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
112 GNUNET_assert(NULL != db);
113 deleted = db->expire_records(db->cls, GNUNET_TIME_absolute_get());
114 GNUNET_log(GNUNET_ERROR_TYPE_INFO, "%d records expired.\n", deleted);
115 GNUNET_SCHEDULER_add_delayed(
116 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, CLEANUP_INTERVAL),
117 &cleanup_expired_records, NULL);
122 * A client disconnected. Remove all of its data structure entries.
124 * @param cls closure, NULL
125 * @param client identification of the client
128 handle_client_disconnect (void *cls,
129 struct GNUNET_SERVER_Client
135 * Function called by for each matching record.
138 * @param peer peer identity
139 * @param sub_system name of the GNUnet sub system responsible
140 * @param value stored value
141 * @param size size of stored value
143 int record_iterator(void *cls,
144 struct GNUNET_PEERSTORE_Record *record,
147 struct GNUNET_SERVER_TransmitContext *tc = cls;
148 struct StoreRecordMessage *srm;
150 srm = PEERSTORE_create_record_message(record->sub_system,
156 GNUNET_MESSAGE_TYPE_PEERSTORE_ITERATE_RECORD);
157 GNUNET_SERVER_transmit_context_append_message(tc, (const struct GNUNET_MessageHeader *)srm);
162 * Iterator over all watcher clients
163 * to notify them of a new record
165 * @param cls closuer, a 'struct GNUNET_PEERSTORE_Record *'
166 * @param key hash of record key
167 * @param value the watcher client, a 'struct GNUNET_SERVER_Client *'
168 * @return #GNUNET_YES to continue iterating
170 int watch_notifier_it(void *cls,
171 const struct GNUNET_HashCode *key,
174 struct GNUNET_PEERSTORE_Record *record = cls;
175 struct GNUNET_SERVER_Client *client = value;
176 struct StoreRecordMessage *srm;
178 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Found a watcher to update.\n");
181 GNUNET_CONTAINER_multihashmap_remove(watchers, key, value);
184 srm = PEERSTORE_create_record_message(record->sub_system,
190 GNUNET_MESSAGE_TYPE_PEERSTORE_WATCH_RECORD);
191 GNUNET_SERVER_notification_context_unicast(nc, client,
192 (const struct GNUNET_MessageHeader *)srm, GNUNET_YES);
197 * Given a new record, notifies watchers
199 * @cls closure, a 'struct GNUNET_PEERSTORE_Record *'
202 void watch_notifier (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
204 struct GNUNET_PEERSTORE_Record *record = cls;
205 struct GNUNET_HashCode keyhash;
207 GNUNET_log(GNUNET_ERROR_TYPE_INFO, "Sending update to any watchers.\n");
208 PEERSTORE_hash_key(record->sub_system,
212 GNUNET_CONTAINER_multihashmap_get_multiple(watchers, &keyhash, &watch_notifier_it, record);
216 * Handle a watch cancel request from client
219 * @param client identification of the client
220 * @param message the actual message
222 void handle_watch_cancel (void *cls,
223 struct GNUNET_SERVER_Client *client,
224 const struct GNUNET_MessageHeader *message)
226 struct StoreKeyHashMessage *hm;
228 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received a watch cancel request from client.\n");
229 hm = (struct StoreKeyHashMessage *) message;
230 GNUNET_CONTAINER_multihashmap_remove(watchers, &hm->keyhash, client);
231 GNUNET_SERVER_receive_done(client, GNUNET_OK);
235 * Handle a watch request from client
238 * @param client identification of the client
239 * @param message the actual message
241 void handle_watch (void *cls,
242 struct GNUNET_SERVER_Client *client,
243 const struct GNUNET_MessageHeader *message)
245 struct StoreKeyHashMessage *hm;
247 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received a watch request from client.\n");
248 hm = (struct StoreKeyHashMessage *) message;
249 GNUNET_SERVER_client_mark_monitor(client);
250 GNUNET_SERVER_notification_context_add(nc, client);
251 GNUNET_CONTAINER_multihashmap_put(watchers, &hm->keyhash,
252 client, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
253 GNUNET_SERVER_receive_done(client, GNUNET_OK);
257 * Handle an iterate request from client
260 * @param client identification of the client
261 * @param message the actual message
263 void handle_iterate (void *cls,
264 struct GNUNET_SERVER_Client *client,
265 const struct GNUNET_MessageHeader *message)
267 struct GNUNET_PEERSTORE_Record *record;
268 struct GNUNET_SERVER_TransmitContext *tc;
270 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received an iterate request from client.\n");
271 record = PEERSTORE_parse_record_message(message);
274 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Malformed iterate request from client\n");
275 GNUNET_SERVER_receive_done(client, GNUNET_SYSERR);
278 if(NULL == record->sub_system)
280 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Sub system not supplied in client iterate request\n");
281 GNUNET_SERVER_receive_done(client, GNUNET_SYSERR);
284 tc = GNUNET_SERVER_transmit_context_create (client);
285 if(GNUNET_OK == db->iterate_records(db->cls,
292 GNUNET_SERVER_transmit_context_append_data(tc, NULL, 0, GNUNET_MESSAGE_TYPE_PEERSTORE_ITERATE_END);
293 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
298 GNUNET_SERVER_receive_done(client, GNUNET_SYSERR);
300 GNUNET_free(record); /* FIXME: destroy record */
304 * Handle a store request from client
307 * @param client identification of the client
308 * @param message the actual message
310 void handle_store (void *cls,
311 struct GNUNET_SERVER_Client *client,
312 const struct GNUNET_MessageHeader *message)
314 struct GNUNET_PEERSTORE_Record *record;
315 struct GNUNET_SERVER_TransmitContext *tc;
317 record = PEERSTORE_parse_record_message(message);
320 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Malformed store request from client\n");
321 GNUNET_SERVER_receive_done(client, GNUNET_SYSERR);
324 if(NULL == record->sub_system
325 || NULL == record->peer
326 || NULL == record->key)
328 /* FIXME: Destroy record */
329 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Full key not supplied in client store request\n");
330 GNUNET_SERVER_receive_done(client, GNUNET_SYSERR);
333 GNUNET_log(GNUNET_ERROR_TYPE_INFO, "Received a store request (size: %lu) for sub system `%s', peer `%s', key `%s'\n",
336 GNUNET_i2s (record->peer),
338 if(GNUNET_OK != db->store_record(db->cls,
346 /* FIXME: Destroy record */
347 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Failed to store requested value, sqlite database error.");
348 GNUNET_SERVER_receive_done(client, GNUNET_SYSERR);
351 tc = GNUNET_SERVER_transmit_context_create (client);
352 GNUNET_SERVER_transmit_context_append_data(tc, NULL, 0, GNUNET_MESSAGE_TYPE_PEERSTORE_STORE_RESULT_OK);
353 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
354 GNUNET_SCHEDULER_add_continuation(&watch_notifier, record, -1);
358 * Peerstore service runner.
361 * @param server the initialized server
362 * @param c configuration to use
366 struct GNUNET_SERVER_Handle *server,
367 const struct GNUNET_CONFIGURATION_Handle *c)
369 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
370 {&handle_store, NULL, GNUNET_MESSAGE_TYPE_PEERSTORE_STORE, 0},
371 {&handle_iterate, NULL, GNUNET_MESSAGE_TYPE_PEERSTORE_ITERATE, 0},
372 {&handle_watch, NULL, GNUNET_MESSAGE_TYPE_PEERSTORE_WATCH, sizeof(struct StoreKeyHashMessage)},
373 {&handle_watch_cancel, NULL, GNUNET_MESSAGE_TYPE_PEERSTORE_WATCH_CANCEL, sizeof(struct StoreKeyHashMessage)},
380 GNUNET_CONFIGURATION_get_value_string (cfg, "peerstore", "DATABASE",
382 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No database backend configured\n");
386 GNUNET_asprintf (&db_lib_name, "libgnunet_plugin_peerstore_%s", database);
387 db = GNUNET_PLUGIN_load(db_lib_name, (void *) cfg);
388 GNUNET_free(database);
391 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Could not load database backend `%s'\n", db_lib_name);
394 nc = GNUNET_SERVER_notification_context_create (server, 16);
395 watchers = GNUNET_CONTAINER_multihashmap_create(10, GNUNET_NO);
396 GNUNET_SCHEDULER_add_now(&cleanup_expired_records, NULL);
397 GNUNET_SERVER_add_handlers (server, handlers);
398 GNUNET_SERVER_disconnect_notify (server,
399 &handle_client_disconnect,
402 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
409 * The main function for the peerstore service.
411 * @param argc number of arguments from the command line
412 * @param argv command line arguments
413 * @return 0 ok, 1 on error
416 main (int argc, char *const *argv)
419 GNUNET_SERVICE_run (argc,
422 GNUNET_SERVICE_OPTION_NONE,
423 &run, NULL)) ? 0 : 1;
426 /* end of gnunet-service-peerstore.c */