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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);
121 * Search for a disconnected client and remove it
123 * @param cls closuer, a 'struct GNUNET_PEERSTORE_Record *'
124 * @param key hash of record key
125 * @param value the watcher client, a 'struct GNUNET_SERVER_Client *'
126 * @return #GNUNET_YES to continue iterating
128 int client_disconnect_it(void *cls,
129 const struct GNUNET_HashCode *key,
133 GNUNET_CONTAINER_multihashmap_remove(watchers, key, value);
138 * A client disconnected. Remove all of its data structure entries.
140 * @param cls closure, NULL
141 * @param client identification of the client
144 handle_client_disconnect (void *cls,
145 struct GNUNET_SERVER_Client
148 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "A client was disconnected, cleaning up.\n");
149 GNUNET_CONTAINER_multihashmap_iterate(watchers,
150 &client_disconnect_it, client);
154 * Function called by for each matching record.
157 * @param peer peer identity
158 * @param sub_system name of the GNUnet sub system responsible
159 * @param value stored value
160 * @param size size of stored value
162 int record_iterator(void *cls,
163 struct GNUNET_PEERSTORE_Record *record,
166 struct GNUNET_SERVER_Client *client = cls;
167 struct StoreRecordMessage *srm;
169 srm = PEERSTORE_create_record_message(record->sub_system,
175 GNUNET_MESSAGE_TYPE_PEERSTORE_ITERATE_RECORD);
176 GNUNET_SERVER_notification_context_unicast(nc, client, (struct GNUNET_MessageHeader *)srm, GNUNET_NO);
182 * Iterator over all watcher clients
183 * to notify them of a new record
185 * @param cls closuer, a 'struct GNUNET_PEERSTORE_Record *'
186 * @param key hash of record key
187 * @param value the watcher client, a 'struct GNUNET_SERVER_Client *'
188 * @return #GNUNET_YES to continue iterating
190 int watch_notifier_it(void *cls,
191 const struct GNUNET_HashCode *key,
194 struct GNUNET_PEERSTORE_Record *record = cls;
195 struct GNUNET_SERVER_Client *client = value;
196 struct StoreRecordMessage *srm;
198 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Found a watcher to update.\n");
201 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Removing a dead client.\n");
202 GNUNET_CONTAINER_multihashmap_remove(watchers, key, client);
205 srm = PEERSTORE_create_record_message(record->sub_system,
211 GNUNET_MESSAGE_TYPE_PEERSTORE_WATCH_RECORD);
212 GNUNET_SERVER_notification_context_unicast(nc, client,
213 (const struct GNUNET_MessageHeader *)srm, GNUNET_NO);
219 * Given a new record, notifies watchers
221 * @param record changed record to update watchers with
223 void watch_notifier (struct GNUNET_PEERSTORE_Record *record)
225 struct GNUNET_HashCode keyhash;
227 GNUNET_log(GNUNET_ERROR_TYPE_INFO, "Sending update to any watchers.\n");
228 PEERSTORE_hash_key(record->sub_system,
232 GNUNET_CONTAINER_multihashmap_get_multiple(watchers, &keyhash, &watch_notifier_it, record);
236 * Handle a watch cancel request from client
239 * @param client identification of the client
240 * @param message the actual message
242 void handle_watch_cancel (void *cls,
243 struct GNUNET_SERVER_Client *client,
244 const struct GNUNET_MessageHeader *message)
246 struct StoreKeyHashMessage *hm;
248 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received a watch cancel request from client.\n");
249 hm = (struct StoreKeyHashMessage *) message;
250 GNUNET_CONTAINER_multihashmap_remove(watchers, &hm->keyhash, client);
251 GNUNET_SERVER_receive_done(client, GNUNET_OK);
255 * Handle a watch request from client
258 * @param client identification of the client
259 * @param message the actual message
261 void handle_watch (void *cls,
262 struct GNUNET_SERVER_Client *client,
263 const struct GNUNET_MessageHeader *message)
265 struct StoreKeyHashMessage *hm;
267 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received a watch request from client.\n");
268 hm = (struct StoreKeyHashMessage *) message;
269 GNUNET_SERVER_client_mark_monitor(client);
270 GNUNET_SERVER_notification_context_add(nc, client);
271 GNUNET_CONTAINER_multihashmap_put(watchers, &hm->keyhash,
272 client, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
273 GNUNET_SERVER_receive_done(client, GNUNET_OK);
277 * Handle an iterate request from client
280 * @param client identification of the client
281 * @param message the actual message
283 void handle_iterate (void *cls,
284 struct GNUNET_SERVER_Client *client,
285 const struct GNUNET_MessageHeader *message)
287 struct GNUNET_PEERSTORE_Record *record;
288 struct GNUNET_MessageHeader *endmsg;
290 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received an iterate request from client.\n");
291 record = PEERSTORE_parse_record_message(message);
294 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Malformed iterate request from client\n");
295 GNUNET_SERVER_receive_done(client, GNUNET_SYSERR);
298 if(NULL == record->sub_system)
300 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Sub system not supplied in client iterate request\n");
301 GNUNET_SERVER_receive_done(client, GNUNET_SYSERR);
304 GNUNET_SERVER_notification_context_add(nc, client);
305 if(GNUNET_OK == db->iterate_records(db->cls,
312 endmsg = GNUNET_new(struct GNUNET_MessageHeader);
313 endmsg->size = htons(sizeof(struct GNUNET_MessageHeader));
314 endmsg->type = htons(GNUNET_MESSAGE_TYPE_PEERSTORE_ITERATE_END);
315 GNUNET_SERVER_notification_context_unicast(nc, client, endmsg, GNUNET_NO);
317 GNUNET_SERVER_receive_done(client, GNUNET_OK);
321 GNUNET_SERVER_receive_done(client, GNUNET_SYSERR);
323 PEERSTORE_destroy_record(record);
327 * Handle a store request from client
330 * @param client identification of the client
331 * @param message the actual message
333 void handle_store (void *cls,
334 struct GNUNET_SERVER_Client *client,
335 const struct GNUNET_MessageHeader *message)
337 struct GNUNET_PEERSTORE_Record *record;
339 record = PEERSTORE_parse_record_message(message);
342 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Malformed store request from client\n");
343 GNUNET_SERVER_receive_done(client, GNUNET_SYSERR);
346 if(NULL == record->sub_system
347 || NULL == record->peer
348 || NULL == record->key)
350 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Full key not supplied in client store request\n");
351 PEERSTORE_destroy_record(record);
352 GNUNET_SERVER_receive_done(client, GNUNET_SYSERR);
355 GNUNET_log(GNUNET_ERROR_TYPE_INFO, "Received a store request (size: %lu) for sub system `%s', peer `%s', key `%s'\n",
358 GNUNET_i2s (record->peer),
360 if(GNUNET_OK != db->store_record(db->cls,
368 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Failed to store requested value, sqlite database error.");
369 PEERSTORE_destroy_record(record);
370 GNUNET_SERVER_receive_done(client, GNUNET_SYSERR);
373 GNUNET_SERVER_receive_done(client, GNUNET_OK);
374 watch_notifier(record);
375 PEERSTORE_destroy_record(record);
379 * Peerstore service runner.
382 * @param server the initialized server
383 * @param c configuration to use
387 struct GNUNET_SERVER_Handle *server,
388 const struct GNUNET_CONFIGURATION_Handle *c)
390 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
391 {&handle_store, NULL, GNUNET_MESSAGE_TYPE_PEERSTORE_STORE, 0},
392 {&handle_iterate, NULL, GNUNET_MESSAGE_TYPE_PEERSTORE_ITERATE, 0},
393 {&handle_watch, NULL, GNUNET_MESSAGE_TYPE_PEERSTORE_WATCH, sizeof(struct StoreKeyHashMessage)},
394 {&handle_watch_cancel, NULL, GNUNET_MESSAGE_TYPE_PEERSTORE_WATCH_CANCEL, sizeof(struct StoreKeyHashMessage)},
401 GNUNET_CONFIGURATION_get_value_string (cfg, "peerstore", "DATABASE",
403 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No database backend configured\n");
407 GNUNET_asprintf (&db_lib_name, "libgnunet_plugin_peerstore_%s", database);
408 db = GNUNET_PLUGIN_load(db_lib_name, (void *) cfg);
409 GNUNET_free(database);
412 GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Could not load database backend `%s'\n", db_lib_name);
415 nc = GNUNET_SERVER_notification_context_create (server, 16);
416 watchers = GNUNET_CONTAINER_multihashmap_create(10, GNUNET_NO);
417 GNUNET_SCHEDULER_add_now(&cleanup_expired_records, NULL);
418 GNUNET_SERVER_add_handlers (server, handlers);
419 GNUNET_SERVER_disconnect_notify (server,
420 &handle_client_disconnect,
423 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
430 * The main function for the peerstore service.
432 * @param argc number of arguments from the command line
433 * @param argv command line arguments
434 * @return 0 ok, 1 on error
437 main (int argc, char *const *argv)
440 GNUNET_SERVICE_run (argc,
443 GNUNET_SERVICE_OPTION_NONE,
444 &run, NULL)) ? 0 : 1;
447 /* end of gnunet-service-peerstore.c */