2 This file is part of GNUnet
3 (C) 2004, 2005, 2006, 2007, 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
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
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file datastore/gnunet-service-datastore.c
23 * @brief Management for the datastore for files stored on a GNUnet node
24 * @author Christian Grothoff
28 #include "gnunet_util_lib.h"
29 #include "gnunet_arm_service.h"
30 #include "gnunet_protocols.h"
31 #include "plugin_datastore.h"
32 #include "datastore.h"
35 * How many messages do we queue at most per client?
37 #define MAX_PENDING 1024
40 * How long are we at most keeping "expired" content
41 * past the expiration date in the database?
43 #define MAX_EXPIRE_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
48 * Our datastore plugin.
50 struct DatastorePlugin
54 * API of the transport as returned by the plugin's
55 * initialization function.
57 struct GNUNET_DATASTORE_PluginFunctions *api;
60 * Short name for the plugin (i.e. "sqlite").
65 * Name of the library (i.e. "gnunet_plugin_datastore_sqlite").
70 * Environment this transport service is using
73 struct GNUNET_DATASTORE_PluginEnvironment env;
79 * Linked list of active reservations.
81 struct ReservationList
85 * This is a linked list.
87 struct ReservationList *next;
90 * Client that made the reservation.
92 struct GNUNET_SERVER_Client *client;
95 * Number of bytes (still) reserved.
100 * Number of items (still) reserved.
105 * Reservation identifier.
113 * Our datastore plugin (NULL if not available).
115 static struct DatastorePlugin *plugin;
118 * Linked list of space reservations made by clients.
120 static struct ReservationList *reservations;
123 * Bloomfilter to quickly tell if we don't have the content.
125 static struct GNUNET_CONTAINER_BloomFilter *filter;
128 * Static counter to produce reservation identifiers.
130 static int reservation_gen;
133 * How much space are we allowed to use?
135 static unsigned long long quota;
138 * How much space are we using for the cache? (space available for
139 * insertions that will be instantly reclaimed by discarding less
140 * important content --- or possibly whatever we just inserted into
143 static unsigned long long cache_size;
146 * How much space have we currently reserved?
148 static unsigned long long reserved;
151 * Identity of the task that is used to delete
154 static GNUNET_SCHEDULER_TaskIdentifier expired_kill_task;
159 const struct GNUNET_CONFIGURATION_Handle *cfg;
164 struct GNUNET_SCHEDULER_Handle *sched;
167 * Function called once the transmit operation has
168 * either failed or succeeded.
171 * @param status GNUNET_OK on success, GNUNET_SYSERR on error
173 typedef void (*TransmitContinuation)(void *cls,
177 struct TransmitCallbackContext
180 * The message that we're asked to transmit.
182 struct GNUNET_MessageHeader *msg;
185 * Client that we are transmitting to.
187 struct GNUNET_SERVER_Client *client;
190 * Function to call once msg has been transmitted
191 * (or at least added to the buffer).
193 TransmitContinuation tc;
201 * GNUNET_YES if we are supposed to signal the server
202 * completion of the client's request.
209 * Task that is used to remove expired entries from
210 * the datastore. This task will schedule itself
211 * again automatically to always delete all expired
214 * @param cls not used
215 * @param tc task context
218 delete_expired (void *cls,
219 const struct GNUNET_SCHEDULER_TaskContext *tc);
223 * Iterate over the expired items stored in the datastore.
224 * Delete all expired items; once we have processed all
225 * expired items, re-schedule the "delete_expired" task.
227 * @param cls not used
228 * @param next_cls closure to pass to the "next" function.
229 * @param key key for the content
230 * @param size number of bytes in data
231 * @param data content stored
232 * @param type type of the content
233 * @param priority priority of the content
234 * @param anonymity anonymity-level for the content
235 * @param expiration expiration time for the content
236 * @param uid unique identifier for the datum;
237 * maybe 0 if no unique identifier is available
239 * @return GNUNET_SYSERR to abort the iteration, GNUNET_OK to continue
240 * (continue on call to "next", of course),
241 * GNUNET_NO to delete the item and continue (if supported)
244 expired_processor (void *cls,
246 const GNUNET_HashCode * key,
252 struct GNUNET_TIME_Absolute
256 struct GNUNET_TIME_Absolute now;
258 expired_kill_task = GNUNET_SCHEDULER_NO_TASK;
262 = GNUNET_SCHEDULER_add_delayed (sched,
266 return GNUNET_SYSERR;
268 now = GNUNET_TIME_absolute_get ();
269 if (expiration.value > now.value)
271 /* finished processing */
272 plugin->api->next_request (next_cls, GNUNET_YES);
273 return GNUNET_SYSERR;
275 plugin->api->next_request (next_cls, GNUNET_NO);
277 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
278 "Deleting content that expired %llu ms ago\n",
279 (unsigned long long) (now.value - expiration.value));
281 GNUNET_CONTAINER_bloomfilter_remove (filter,
283 return GNUNET_NO; /* delete */
288 * Task that is used to remove expired entries from
289 * the datastore. This task will schedule itself
290 * again automatically to always delete all expired
293 * @param cls not used
294 * @param tc task context
297 delete_expired (void *cls,
298 const struct GNUNET_SCHEDULER_TaskContext *tc)
300 plugin->api->iter_ascending_expiration (plugin->api->cls,
308 * An iterator over a set of items stored in the datastore.
311 * @param next_cls closure to pass to the "next" function.
312 * @param key key for the content
313 * @param size number of bytes in data
314 * @param data content stored
315 * @param type type of the content
316 * @param priority priority of the content
317 * @param anonymity anonymity-level for the content
318 * @param expiration expiration time for the content
319 * @param uid unique identifier for the datum;
320 * maybe 0 if no unique identifier is available
322 * @return GNUNET_SYSERR to abort the iteration, GNUNET_OK to continue
323 * (continue on call to "next", of course),
324 * GNUNET_NO to delete the item and continue (if supported)
329 const GNUNET_HashCode * key,
335 struct GNUNET_TIME_Absolute
339 unsigned long long *need = cls;
344 return GNUNET_SYSERR;
346 if (size + GNUNET_DATASTORE_ENTRY_OVERHEAD > *need)
349 *need -= size + GNUNET_DATASTORE_ENTRY_OVERHEAD;
350 plugin->api->next_request (next_cls,
351 (0 == *need) ? GNUNET_YES : GNUNET_NO);
353 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
354 "Deleting %llu bytes of low-priority content (still trying to free another %llu bytes)\n",
355 size + GNUNET_DATASTORE_ENTRY_OVERHEAD,
358 GNUNET_CONTAINER_bloomfilter_remove (filter,
365 * Manage available disk space by running tasks
366 * that will discard content if necessary. This
367 * function will be run whenever a request for
368 * "need" bytes of storage could only be satisfied
369 * by eating into the "cache" (and we want our cache
372 * @param need number of bytes of content that were
373 * placed into the "cache" (and hence the
374 * number of bytes that should be removed).
377 manage_space (unsigned long long need)
379 unsigned long long *n;
382 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
383 "Asked to free up %llu bytes of cache space\n",
386 n = GNUNET_malloc (sizeof(unsigned long long));
388 plugin->api->iter_low_priority (plugin->api->cls,
396 * Function called to notify a client about the socket
397 * begin ready to queue more data. "buf" will be
398 * NULL and "size" zero if the socket was closed for
399 * writing in the meantime.
402 * @param size number of bytes available in buf
403 * @param buf where the callee should write the message
404 * @return number of bytes written to buf
407 transmit_callback (void *cls,
408 size_t size, void *buf)
410 struct TransmitCallbackContext *tcc = cls;
413 msize = ntohs(tcc->msg->size);
417 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
418 "Transmission failed.\n");
421 tcc->tc (tcc->tc_cls, GNUNET_SYSERR);
422 if (GNUNET_YES == tcc->end)
424 GNUNET_SERVER_receive_done (tcc->client, GNUNET_SYSERR);
426 GNUNET_free (tcc->msg);
430 GNUNET_assert (size >= msize);
431 memcpy (buf, tcc->msg, msize);
433 tcc->tc (tcc->tc_cls, GNUNET_OK);
434 if (GNUNET_YES == tcc->end)
436 GNUNET_SERVER_receive_done (tcc->client, GNUNET_OK);
441 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
442 "Response transmitted, more pending!\n");
445 GNUNET_free (tcc->msg);
452 * Transmit the given message to the client.
454 * @param client target of the message
455 * @param msg message to transmit, will be freed!
456 * @param tc function to call afterwards
457 * @param tc_cls closure for tc
458 * @param end is this the last response (and we should
459 * signal the server completion accodingly after
460 * transmitting this message)?
463 transmit (struct GNUNET_SERVER_Client *client,
464 struct GNUNET_MessageHeader *msg,
465 TransmitContinuation tc,
469 struct TransmitCallbackContext *tcc;
471 tcc = GNUNET_malloc (sizeof(struct TransmitCallbackContext));
473 tcc->client = client;
475 tcc->tc_cls = tc_cls;
479 GNUNET_SERVER_notify_transmit_ready (client,
481 GNUNET_TIME_UNIT_FOREVER_REL,
486 if (GNUNET_YES == end)
489 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
490 "Disconnecting client.\n");
492 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
495 tc (tc_cls, GNUNET_SYSERR);
503 * Transmit a status code to the client.
505 * @param client receiver of the response
506 * @param code status code
507 * @param msg optional error message (can be NULL)
510 transmit_status (struct GNUNET_SERVER_Client *client,
514 struct StatusMessage *sm;
518 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
519 "Transmitting `%s' message with value %d and message `%s'\n",
522 msg != NULL ? msg : "(none)");
524 slen = (msg == NULL) ? 0 : strlen(msg) + 1;
525 sm = GNUNET_malloc (sizeof(struct StatusMessage) + slen);
526 sm->header.size = htons(sizeof(struct StatusMessage) + slen);
527 sm->header.type = htons(GNUNET_MESSAGE_TYPE_DATASTORE_STATUS);
528 sm->status = htonl(code);
530 memcpy (&sm[1], msg, slen);
531 transmit (client, &sm->header, NULL, NULL, GNUNET_YES);
536 * Function called once the transmit operation has
537 * either failed or succeeded.
539 * @param next_cls closure for calling "next_request" callback
540 * @param status GNUNET_OK on success, GNUNET_SYSERR on error
543 get_next(void *next_cls,
546 if (status != GNUNET_OK)
548 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
549 _("Failed to transmit an item to the client; aborting iteration.\n"));
550 plugin->api->next_request (next_cls, GNUNET_YES);
553 plugin->api->next_request (next_cls, GNUNET_NO);
558 * Function that will transmit the given datastore entry
561 * @param cls closure, pointer to the client (of type GNUNET_SERVER_Client).
562 * @param next_cls closure to use to ask for the next item
563 * @param key key for the content
564 * @param size number of bytes in data
565 * @param data content stored
566 * @param type type of the content
567 * @param priority priority of the content
568 * @param anonymity anonymity-level for the content
569 * @param expiration expiration time for the content
570 * @param uid unique identifier for the datum;
571 * maybe 0 if no unique identifier is available
573 * @return GNUNET_SYSERR to abort the iteration, GNUNET_OK to continue,
574 * GNUNET_NO to delete the item and continue (if supported)
577 transmit_item (void *cls,
579 const GNUNET_HashCode * key,
585 struct GNUNET_TIME_Absolute
586 expiration, uint64_t uid)
588 struct GNUNET_SERVER_Client *client = cls;
589 struct GNUNET_MessageHeader *end;
590 struct DataMessage *dm;
594 /* transmit 'DATA_END' */
596 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
597 "Transmitting `%s' message\n",
600 end = GNUNET_malloc (sizeof(struct GNUNET_MessageHeader));
601 end->size = htons(sizeof(struct GNUNET_MessageHeader));
602 end->type = htons(GNUNET_MESSAGE_TYPE_DATASTORE_DATA_END);
603 transmit (client, end, NULL, NULL, GNUNET_YES);
604 GNUNET_SERVER_client_drop (client);
607 dm = GNUNET_malloc (sizeof(struct DataMessage) + size);
608 dm->header.size = htons(sizeof(struct DataMessage) + size);
609 dm->header.type = htons(GNUNET_MESSAGE_TYPE_DATASTORE_DATA);
611 dm->size = htonl(size);
612 dm->type = htonl(type);
613 dm->priority = htonl(priority);
614 dm->anonymity = htonl(anonymity);
615 dm->expiration = GNUNET_TIME_absolute_hton(expiration);
616 dm->uid = GNUNET_htonll(uid);
618 memcpy (&dm[1], data, size);
620 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
621 "Transmitting `%s' message\n",
624 transmit (client, &dm->header, &get_next, next_cls, GNUNET_NO);
630 * Handle RESERVE-message.
633 * @param client identification of the client
634 * @param message the actual message
637 handle_reserve (void *cls,
638 struct GNUNET_SERVER_Client *client,
639 const struct GNUNET_MessageHeader *message)
641 const struct ReserveMessage *msg = (const struct ReserveMessage*) message;
642 struct ReservationList *e;
643 unsigned long long used;
644 unsigned long long req;
649 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
650 "Processing `%s' request\n",
653 amount = GNUNET_ntohll(msg->amount);
654 entries = ntohl(msg->entries);
655 used = plugin->api->get_size (plugin->api->cls) + reserved;
656 req = amount + ((unsigned long long) GNUNET_DATASTORE_ENTRY_OVERHEAD) * entries;
657 if (used + req > quota)
660 used = quota; /* cheat a bit for error message (to avoid negative numbers) */
661 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
662 _("Insufficient space (%llu bytes are available) to satisfy `%s' request for %llu bytes\n"),
666 if (cache_size < req)
668 /* TODO: document this in the FAQ; essentially, if this
669 message happens, the insertion request could be blocked
670 by less-important content from migration because it is
671 larger than 1/8th of the overall available space, and
672 we only reserve 1/8th for "fresh" insertions */
673 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
674 _("The requested amount (%llu bytes) is larger than the cache size (%llu bytes)\n"),
677 transmit_status (client, 0,
678 gettext_noop ("Insufficient space to satisfy request and "
679 "requested amount is larger than cache size"));
683 transmit_status (client, 0,
684 gettext_noop ("Insufficient space to satisfy request"));
689 e = GNUNET_malloc (sizeof(struct ReservationList));
690 e->next = reservations;
694 e->entries = entries;
695 e->rid = ++reservation_gen;
696 if (reservation_gen < 0)
697 reservation_gen = 0; /* wrap around */
698 transmit_status (client, e->rid, NULL);
703 * Handle RELEASE_RESERVE-message.
706 * @param client identification of the client
707 * @param message the actual message
710 handle_release_reserve (void *cls,
711 struct GNUNET_SERVER_Client *client,
712 const struct GNUNET_MessageHeader *message)
714 const struct ReleaseReserveMessage *msg = (const struct ReleaseReserveMessage*) message;
715 struct ReservationList *pos;
716 struct ReservationList *prev;
717 struct ReservationList *next;
718 int rid = ntohl(msg->rid);
719 unsigned long long rem;
722 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
723 "Processing `%s' request\n",
728 while (NULL != (pos = next))
737 rem = pos->amount + ((unsigned long long) GNUNET_DATASTORE_ENTRY_OVERHEAD) * pos->entries;
738 GNUNET_assert (reserved >= rem);
741 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
742 "Returning %llu remaining reserved bytes to storage pool\n",
746 transmit_status (client, GNUNET_OK, NULL);
752 transmit_status (client, GNUNET_SYSERR, gettext_noop ("Could not find matching reservation"));
757 * Check that the given message is a valid data message.
759 * @return NULL if the message is not well-formed, otherwise the message
761 static const struct DataMessage *
762 check_data (const struct GNUNET_MessageHeader *message)
766 const struct DataMessage *dm;
768 size = ntohs(message->size);
769 if (size < sizeof(struct DataMessage))
774 dm = (const struct DataMessage *) message;
775 dsize = ntohl(dm->size);
776 if (size != dsize + sizeof(struct DataMessage))
786 * Handle PUT-message.
789 * @param client identification of the client
790 * @param message the actual message
793 handle_put (void *cls,
794 struct GNUNET_SERVER_Client *client,
795 const struct GNUNET_MessageHeader *message)
797 const struct DataMessage *dm = check_data (message);
801 struct ReservationList *pos;
805 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
806 "Processing `%s' request\n",
809 if (ntohl(dm->type) == 0)
817 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
820 rid = ntohl(dm->rid);
821 size = ntohl(dm->size);
825 while ( (NULL != pos) &&
828 GNUNET_break (pos != NULL);
831 GNUNET_break (pos->entries > 0);
832 GNUNET_break (pos->amount > size);
835 reserved -= (size + GNUNET_DATASTORE_ENTRY_OVERHEAD);
839 ret = plugin->api->put (plugin->api->cls,
845 ntohl(dm->anonymity),
846 GNUNET_TIME_absolute_ntoh(dm->expiration),
848 if (GNUNET_OK == ret)
850 GNUNET_CONTAINER_bloomfilter_add (filter,
853 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
854 "Successfully stored %u bytes under key `%s'\n",
856 GNUNET_h2s (&dm->key));
859 transmit_status (client,
860 (GNUNET_SYSERR == ret) ? GNUNET_SYSERR : GNUNET_OK,
862 GNUNET_free_non_null (msg);
863 if (quota - reserved - cache_size < plugin->api->get_size (plugin->api->cls))
864 manage_space (size + GNUNET_DATASTORE_ENTRY_OVERHEAD);
869 * Handle GET-message.
872 * @param client identification of the client
873 * @param message the actual message
876 handle_get (void *cls,
877 struct GNUNET_SERVER_Client *client,
878 const struct GNUNET_MessageHeader *message)
880 const struct GetMessage *msg;
884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
885 "Processing `%s' request\n",
888 size = ntohs(message->size);
889 if ( (size != sizeof(struct GetMessage)) &&
890 (size != sizeof(struct GetMessage) - sizeof(GNUNET_HashCode)) )
893 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
896 msg = (const struct GetMessage*) message;
897 if ( (size == sizeof(struct GetMessage)) &&
898 (GNUNET_YES != GNUNET_CONTAINER_bloomfilter_test (filter,
901 /* don't bother database... */
903 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
904 "Empty result set for `%s' request for `%s'.\n",
906 GNUNET_h2s (&msg->key));
908 GNUNET_SERVER_client_keep (client);
909 transmit_item (client,
910 NULL, NULL, 0, NULL, 0, 0, 0,
911 GNUNET_TIME_UNIT_ZERO_ABS, 0);
914 GNUNET_SERVER_client_keep (client);
915 plugin->api->get (plugin->api->cls,
916 ((size == sizeof(struct GetMessage)) ? &msg->key : NULL),
925 * Handle UPDATE-message.
928 * @param client identification of the client
929 * @param message the actual message
932 handle_update (void *cls,
933 struct GNUNET_SERVER_Client *client,
934 const struct GNUNET_MessageHeader *message)
936 const struct UpdateMessage *msg;
941 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
942 "Processing `%s' request\n",
945 msg = (const struct UpdateMessage*) message;
947 ret = plugin->api->update (plugin->api->cls,
948 GNUNET_ntohll(msg->uid),
949 (int32_t) ntohl(msg->priority),
950 GNUNET_TIME_absolute_ntoh(msg->expiration),
952 transmit_status (client, ret, emsg);
953 GNUNET_free_non_null (emsg);
958 * Handle GET_RANDOM-message.
961 * @param client identification of the client
962 * @param message the actual message
965 handle_get_random (void *cls,
966 struct GNUNET_SERVER_Client *client,
967 const struct GNUNET_MessageHeader *message)
970 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
971 "Processing `%s' request\n",
974 GNUNET_SERVER_client_keep (client);
975 plugin->api->iter_migration_order (plugin->api->cls,
983 * Context for the 'remove_callback'.
988 * Client for whom we're doing the remvoing.
990 struct GNUNET_SERVER_Client *client;
993 * GNUNET_YES if we managed to remove something.
1000 * Callback function that will cause the item that is passed
1001 * in to be deleted (by returning GNUNET_NO).
1004 remove_callback (void *cls,
1006 const GNUNET_HashCode * key,
1012 struct GNUNET_TIME_Absolute
1013 expiration, uint64_t uid)
1015 struct RemoveContext *rc = cls;
1020 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1021 "No further matches for `%s' request.\n",
1024 if (GNUNET_YES == rc->found)
1025 transmit_status (rc->client, GNUNET_OK, NULL);
1027 transmit_status (rc->client, GNUNET_NO, _("Content not found"));
1028 GNUNET_SERVER_client_drop (rc->client);
1030 return GNUNET_OK; /* last item */
1032 rc->found = GNUNET_YES;
1034 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1035 "Item %llu matches `%s' request.\n",
1036 (unsigned long long) uid,
1039 GNUNET_CONTAINER_bloomfilter_remove (filter,
1041 plugin->api->next_request (next_cls, GNUNET_YES);
1047 * Handle REMOVE-message.
1049 * @param cls closure
1050 * @param client identification of the client
1051 * @param message the actual message
1054 handle_remove (void *cls,
1055 struct GNUNET_SERVER_Client *client,
1056 const struct GNUNET_MessageHeader *message)
1058 const struct DataMessage *dm = check_data (message);
1059 GNUNET_HashCode vhash;
1060 struct RemoveContext *rc;
1063 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1064 "Processing `%s' request\n",
1070 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1073 rc = GNUNET_malloc (sizeof(struct RemoveContext));
1074 GNUNET_SERVER_client_keep (client);
1075 rc->client = client;
1076 GNUNET_CRYPTO_hash (&dm[1],
1079 plugin->api->get (plugin->api->cls,
1089 * Handle DROP-message.
1091 * @param cls closure
1092 * @param client identification of the client
1093 * @param message the actual message
1096 handle_drop (void *cls,
1097 struct GNUNET_SERVER_Client *client,
1098 const struct GNUNET_MessageHeader *message)
1101 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1102 "Processing `%s' request\n",
1105 plugin->api->drop (plugin->api->cls);
1106 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1111 * List of handlers for the messages understood by this
1114 static struct GNUNET_SERVER_MessageHandler handlers[] = {
1115 {&handle_reserve, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_RESERVE,
1116 sizeof(struct ReserveMessage) },
1117 {&handle_release_reserve, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_RELEASE_RESERVE,
1118 sizeof(struct ReleaseReserveMessage) },
1119 {&handle_put, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_PUT, 0 },
1120 {&handle_update, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_UPDATE,
1121 sizeof (struct UpdateMessage) },
1122 {&handle_get, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_GET, 0 },
1123 {&handle_get_random, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_GET_RANDOM,
1124 sizeof(struct GNUNET_MessageHeader) },
1125 {&handle_remove, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_REMOVE, 0 },
1126 {&handle_drop, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_DROP,
1127 sizeof(struct GNUNET_MessageHeader) },
1134 * Load the datastore plugin.
1136 static struct DatastorePlugin *
1139 struct DatastorePlugin *ret;
1144 GNUNET_CONFIGURATION_get_value_string (cfg,
1145 "DATASTORE", "DATABASE", &name))
1147 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1148 _("No `%s' specified for `%s' in configuration!\n"),
1153 ret = GNUNET_malloc (sizeof(struct DatastorePlugin));
1155 ret->env.sched = sched;
1156 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1157 _("Loading `%s' datastore plugin\n"), name);
1158 GNUNET_asprintf (&libname, "libgnunet_plugin_datastore_%s", name);
1159 ret->short_name = name;
1160 ret->lib_name = libname;
1161 ret->api = GNUNET_PLUGIN_load (libname, &ret->env);
1162 if (ret->api == NULL)
1164 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1165 _("Failed to load datastore plugin for `%s'\n"), name);
1166 GNUNET_free (ret->short_name);
1167 GNUNET_free (libname);
1176 * Function called when the service shuts
1177 * down. Unloads our datastore plugin.
1179 * @param plug plugin to unload
1182 unload_plugin (struct DatastorePlugin *plug)
1185 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1186 "Datastore service is unloading plugin...\n");
1188 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
1189 GNUNET_free (plug->lib_name);
1190 GNUNET_free (plug->short_name);
1196 * Last task run during shutdown. Disconnects us from
1197 * the transport and core.
1200 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1202 unload_plugin (plugin);
1206 GNUNET_CONTAINER_bloomfilter_free (filter);
1209 GNUNET_ARM_stop_services (cfg, tc->sched, "statistics", NULL);
1214 * Function that removes all active reservations made
1215 * by the given client and releases the space for other
1218 * @param cls closure
1219 * @param client identification of the client
1222 cleanup_reservations (void *cls,
1223 struct GNUNET_SERVER_Client
1226 struct ReservationList *pos;
1227 struct ReservationList *prev;
1228 struct ReservationList *next;
1235 if (pos->client == client)
1238 reservations = next;
1241 reserved -= pos->amount + pos->entries * GNUNET_DATASTORE_ENTRY_OVERHEAD;
1254 * Process datastore requests.
1256 * @param cls closure
1257 * @param s scheduler to use
1258 * @param server the initialized server
1259 * @param c configuration to use
1263 struct GNUNET_SCHEDULER_Handle *s,
1264 struct GNUNET_SERVER_Handle *server,
1265 const struct GNUNET_CONFIGURATION_Handle *c)
1268 unsigned int bf_size;
1273 GNUNET_CONFIGURATION_get_value_number (cfg,
1274 "DATASTORE", "QUOTA", "a))
1276 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1277 _("No `%s' specified for `%s' in configuration!\n"),
1282 cache_size = quota / 8; /* Or should we make this an option? */
1283 bf_size = quota / 32; /* 8 bit per entry, 1 bit per 32 kb in DB */
1286 GNUNET_CONFIGURATION_get_value_filename (cfg,
1291 GNUNET_DISK_directory_create_for_file (fn)) )
1293 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1294 _("Could not use specified filename `%s' for bloomfilter.\n"),
1295 fn != NULL ? fn : "");
1296 GNUNET_free_non_null (fn);
1299 filter = GNUNET_CONTAINER_bloomfilter_load (fn, bf_size, 5); /* approx. 3% false positives at max use */
1300 GNUNET_free_non_null (fn);
1303 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1304 _("Failed to initialize bloomfilter.\n"));
1307 GNUNET_ARM_start_services (cfg, sched, "statistics", NULL);
1308 plugin = load_plugin ();
1311 GNUNET_CONTAINER_bloomfilter_free (filter);
1313 GNUNET_ARM_stop_services (cfg, sched, "statistics", NULL);
1316 GNUNET_SERVER_disconnect_notify (server, &cleanup_reservations, NULL);
1317 GNUNET_SERVER_add_handlers (server, handlers);
1319 = GNUNET_SCHEDULER_add_with_priority (sched,
1320 GNUNET_SCHEDULER_PRIORITY_IDLE,
1321 &delete_expired, NULL);
1322 GNUNET_SCHEDULER_add_delayed (sched,
1323 GNUNET_TIME_UNIT_FOREVER_REL,
1324 &cleaning_task, NULL);
1330 * The main function for the datastore service.
1332 * @param argc number of arguments from the command line
1333 * @param argv command line arguments
1334 * @return 0 ok, 1 on error
1337 main (int argc, char *const *argv)
1342 GNUNET_SERVICE_run (argc,
1345 GNUNET_SERVICE_OPTION_NONE,
1346 &run, NULL)) ? 0 : 1;
1351 /* end of gnunet-service-datastore.c */