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3 Copyright (C) 2012-2016 GNUnet e.V.
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6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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22 * @brief api for the set service
23 * @author Florian Dold
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_protocols.h"
29 #include "gnunet_set_service.h"
33 #define LOG(kind,...) GNUNET_log_from (kind, "set-api",__VA_ARGS__)
37 struct SetCopyRequest *next;
39 struct SetCopyRequest *prev;
43 GNUNET_SET_CopyReadyCallback cb;
47 * Opaque handle to a set.
49 struct GNUNET_SET_Handle
52 * Message queue for @e client.
54 struct GNUNET_MQ_Handle *mq;
57 * Linked list of operations on the set.
59 struct GNUNET_SET_OperationHandle *ops_head;
62 * Linked list of operations on the set.
64 struct GNUNET_SET_OperationHandle *ops_tail;
67 * Callback for the current iteration over the set,
68 * NULL if no iterator is active.
70 GNUNET_SET_ElementIterator iterator;
73 * Closure for @e iterator
78 * Should the set be destroyed once all operations are gone?
80 int destroy_requested;
83 * Has the set become invalid (e.g. service died)?
88 * Both client and service count the number of iterators
89 * created so far to match replies with iterators.
91 uint16_t iteration_id;
94 * Configuration, needed when creating (lazy) copies.
96 const struct GNUNET_CONFIGURATION_Handle *cfg;
99 * Doubly linked list of copy requests.
101 struct SetCopyRequest *copy_req_head;
104 * Doubly linked list of copy requests.
106 struct SetCopyRequest *copy_req_tail;
111 * Handle for a set operation request from another peer.
113 struct GNUNET_SET_Request
116 * Id of the request, used to identify the request when
117 * accepting/rejecting it.
122 * Has the request been accepted already?
123 * #GNUNET_YES/#GNUNET_NO
130 * Handle to an operation. Only known to the service after committing
131 * the handle with a set.
133 struct GNUNET_SET_OperationHandle
136 * Function to be called when we have a result,
139 GNUNET_SET_ResultIterator result_cb;
142 * Closure for @e result_cb.
147 * Local set used for the operation,
148 * NULL if no set has been provided by conclude yet.
150 struct GNUNET_SET_Handle *set;
153 * Message sent to the server on calling conclude,
154 * NULL if conclude has been called.
156 struct GNUNET_MQ_Envelope *conclude_mqm;
159 * Address of the request if in the conclude message,
160 * used to patch the request id into the message when the set is known.
162 uint32_t *request_id_addr;
165 * Handles are kept in a linked list.
167 struct GNUNET_SET_OperationHandle *prev;
170 * Handles are kept in a linked list.
172 struct GNUNET_SET_OperationHandle *next;
175 * Request ID to identify the operation within the set.
182 * Opaque handle to a listen operation.
184 struct GNUNET_SET_ListenHandle
188 * Message queue for the client.
190 struct GNUNET_MQ_Handle* mq;
193 * Configuration handle for the listener, stored
194 * here to be able to reconnect transparently on
195 * connection failure.
197 const struct GNUNET_CONFIGURATION_Handle *cfg;
200 * Function to call on a new incoming request,
203 GNUNET_SET_ListenCallback listen_cb;
206 * Closure for @e listen_cb.
211 * Application ID we listen for.
213 struct GNUNET_HashCode app_id;
216 * Time to wait until we try to reconnect on failure.
218 struct GNUNET_TIME_Relative reconnect_backoff;
221 * Task for reconnecting when the listener fails.
223 struct GNUNET_SCHEDULER_Task *reconnect_task;
226 * Operation we listen for.
228 enum GNUNET_SET_OperationType operation;
232 /* mutual recursion with handle_copy_lazy */
233 static struct GNUNET_SET_Handle *
234 create_internal (const struct GNUNET_CONFIGURATION_Handle *cfg,
235 enum GNUNET_SET_OperationType op,
236 const uint32_t *cookie);
240 * Handle element for iteration over the set. Notifies the
241 * iterator and sends an acknowledgement to the service.
243 * @param cls the `struct GNUNET_SET_Handle *`
244 * @param msg the message
247 handle_copy_lazy (void *cls,
248 const struct GNUNET_SET_CopyLazyResponseMessage *msg)
250 struct GNUNET_SET_Handle *set = cls;
251 struct SetCopyRequest *req;
252 struct GNUNET_SET_Handle *new_set;
254 req = set->copy_req_head;
257 /* Service sent us unsolicited lazy copy response */
262 LOG (GNUNET_ERROR_TYPE_DEBUG,
263 "Handling response to lazy copy\n");
264 GNUNET_CONTAINER_DLL_remove (set->copy_req_head,
267 // We pass none as operation here, since it doesn't matter when
269 new_set = create_internal (set->cfg,
270 GNUNET_SET_OPERATION_NONE,
272 req->cb (req->cls, new_set);
278 * Check that the given @a msg is well-formed.
281 * @param msg message to check
282 * @return #GNUNET_OK if message is well-formed
285 check_iter_element (void *cls,
286 const struct GNUNET_SET_IterResponseMessage *msg)
288 /* minimum size was already checked, everything else is OK! */
294 * Handle element for iteration over the set. Notifies the
295 * iterator and sends an acknowledgement to the service.
297 * @param cls the `struct GNUNET_SET_Handle *`
298 * @param mh the message
301 handle_iter_element (void *cls,
302 const struct GNUNET_SET_IterResponseMessage *msg)
304 struct GNUNET_SET_Handle *set = cls;
305 GNUNET_SET_ElementIterator iter = set->iterator;
306 struct GNUNET_SET_Element element;
307 struct GNUNET_SET_IterAckMessage *ack_msg;
308 struct GNUNET_MQ_Envelope *ev;
311 msize = ntohs (msg->header.size);
312 if (set->iteration_id != ntohs (msg->iteration_id))
314 /* element from a previous iteration, skip! */
319 element.size = msize - sizeof (struct GNUNET_SET_IterResponseMessage);
320 element.element_type = ntohs (msg->element_type);
321 element.data = &msg[1];
322 iter (set->iterator_cls,
325 ev = GNUNET_MQ_msg (ack_msg,
326 GNUNET_MESSAGE_TYPE_SET_ITER_ACK);
327 ack_msg->send_more = htonl ((NULL != iter));
328 GNUNET_MQ_send (set->mq, ev);
333 * Handle message signalling conclusion of iteration over the set.
334 * Notifies the iterator that we are done.
337 * @param mh the message
340 handle_iter_done (void *cls,
341 const struct GNUNET_MessageHeader *mh)
343 struct GNUNET_SET_Handle *set = cls;
344 GNUNET_SET_ElementIterator iter = set->iterator;
348 set->iterator = NULL;
350 iter (set->iterator_cls,
353 if (GNUNET_YES == set->destroy_requested)
354 GNUNET_SET_destroy (set);
359 * Check that the given @a msg is well-formed.
362 * @param msg message to check
363 * @return #GNUNET_OK if message is well-formed
366 check_result (void *cls,
367 const struct GNUNET_SET_ResultMessage *msg)
369 /* minimum size was already checked, everything else is OK! */
375 * Handle result message for a set operation.
378 * @param mh the message
381 handle_result (void *cls,
382 const struct GNUNET_SET_ResultMessage *msg)
384 struct GNUNET_SET_Handle *set = cls;
385 struct GNUNET_SET_OperationHandle *oh;
386 struct GNUNET_SET_Element e;
387 enum GNUNET_SET_Status result_status;
390 GNUNET_assert (NULL != set->mq);
391 result_status = ntohs (msg->result_status);
392 LOG (GNUNET_ERROR_TYPE_DEBUG,
393 "Got result message with status %d\n",
396 oh = GNUNET_MQ_assoc_get (set->mq,
397 ntohl (msg->request_id));
400 /* 'oh' can be NULL if we canceled the operation, but the service
401 did not get the cancel message yet. */
402 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
403 "Ignoring result from canceled operation\n");
407 switch (result_status)
409 case GNUNET_SET_STATUS_OK:
410 case GNUNET_SET_STATUS_ADD_LOCAL:
411 case GNUNET_SET_STATUS_ADD_REMOTE:
413 case GNUNET_SET_STATUS_FAILURE:
414 case GNUNET_SET_STATUS_DONE:
416 case GNUNET_SET_STATUS_HALF_DONE:
417 /* not used anymore */
422 LOG (GNUNET_ERROR_TYPE_DEBUG,
423 "Treating result as final status\n");
424 GNUNET_MQ_assoc_remove (set->mq,
425 ntohl (msg->request_id));
426 GNUNET_CONTAINER_DLL_remove (set->ops_head,
429 /* Need to do this calculation _before_ the result callback,
430 as IF the application still has a valid set handle, it
431 may trigger destruction of the set during the callback. */
432 destroy_set = (GNUNET_YES == set->destroy_requested) &&
433 (NULL == set->ops_head);
434 if (NULL != oh->result_cb)
436 oh->result_cb (oh->result_cls,
438 GNUNET_ntohll (msg->current_size),
443 LOG (GNUNET_ERROR_TYPE_DEBUG,
444 "No callback for final status\n");
447 GNUNET_SET_destroy (set);
452 LOG (GNUNET_ERROR_TYPE_DEBUG,
453 "Treating result as element\n");
455 e.size = ntohs (msg->header.size) - sizeof (struct GNUNET_SET_ResultMessage);
456 e.element_type = ntohs (msg->element_type);
457 if (NULL != oh->result_cb)
458 oh->result_cb (oh->result_cls,
460 GNUNET_ntohll (msg->current_size),
466 * Destroy the given set operation.
468 * @param oh set operation to destroy
471 set_operation_destroy (struct GNUNET_SET_OperationHandle *oh)
473 struct GNUNET_SET_Handle *set = oh->set;
474 struct GNUNET_SET_OperationHandle *h_assoc;
476 if (NULL != oh->conclude_mqm)
477 GNUNET_MQ_discard (oh->conclude_mqm);
478 /* is the operation already commited? */
481 GNUNET_CONTAINER_DLL_remove (set->ops_head,
484 h_assoc = GNUNET_MQ_assoc_remove (set->mq,
486 GNUNET_assert ((NULL == h_assoc) || (h_assoc == oh));
493 * Cancel the given set operation. We need to send an explicit cancel
494 * message, as all operations one one set communicate using one
497 * @param oh set operation to cancel
500 GNUNET_SET_operation_cancel (struct GNUNET_SET_OperationHandle *oh)
502 struct GNUNET_SET_Handle *set = oh->set;
503 struct GNUNET_SET_CancelMessage *m;
504 struct GNUNET_MQ_Envelope *mqm;
508 mqm = GNUNET_MQ_msg (m, GNUNET_MESSAGE_TYPE_SET_CANCEL);
509 m->request_id = htonl (oh->request_id);
510 GNUNET_MQ_send (set->mq, mqm);
512 set_operation_destroy (oh);
513 if ( (NULL != set) &&
514 (GNUNET_YES == set->destroy_requested) &&
515 (NULL == set->ops_head) )
517 LOG (GNUNET_ERROR_TYPE_DEBUG,
518 "Destroying set after operation cancel\n");
519 GNUNET_SET_destroy (set);
525 * We encountered an error communicating with the set service while
526 * performing a set operation. Report to the application.
528 * @param cls the `struct GNUNET_SET_Handle`
529 * @param error error code
532 handle_client_set_error (void *cls,
533 enum GNUNET_MQ_Error error)
535 struct GNUNET_SET_Handle *set = cls;
536 GNUNET_SET_ElementIterator iter = set->iterator;
538 LOG (GNUNET_ERROR_TYPE_ERROR,
539 "Handling client set error %d\n",
541 while (NULL != set->ops_head)
543 if (NULL != set->ops_head->result_cb)
544 set->ops_head->result_cb (set->ops_head->result_cls,
547 GNUNET_SET_STATUS_FAILURE);
548 set_operation_destroy (set->ops_head);
550 set->iterator = NULL;
552 set->invalid = GNUNET_YES;
554 iter (set->iterator_cls,
559 static struct GNUNET_SET_Handle *
560 create_internal (const struct GNUNET_CONFIGURATION_Handle *cfg,
561 enum GNUNET_SET_OperationType op,
562 const uint32_t *cookie)
564 struct GNUNET_SET_Handle *set = GNUNET_new (struct GNUNET_SET_Handle);
565 struct GNUNET_MQ_MessageHandler mq_handlers[] = {
566 GNUNET_MQ_hd_var_size (result,
567 GNUNET_MESSAGE_TYPE_SET_RESULT,
568 struct GNUNET_SET_ResultMessage,
570 GNUNET_MQ_hd_var_size (iter_element,
571 GNUNET_MESSAGE_TYPE_SET_ITER_ELEMENT,
572 struct GNUNET_SET_IterResponseMessage,
574 GNUNET_MQ_hd_fixed_size (iter_done,
575 GNUNET_MESSAGE_TYPE_SET_ITER_DONE,
576 struct GNUNET_MessageHeader,
578 GNUNET_MQ_hd_fixed_size (copy_lazy,
579 GNUNET_MESSAGE_TYPE_SET_COPY_LAZY_RESPONSE,
580 struct GNUNET_SET_CopyLazyResponseMessage,
582 GNUNET_MQ_handler_end ()
584 struct GNUNET_MQ_Envelope *mqm;
585 struct GNUNET_SET_CreateMessage *create_msg;
586 struct GNUNET_SET_CopyLazyConnectMessage *copy_msg;
589 set->mq = GNUNET_CLIENT_connect (cfg,
592 &handle_client_set_error,
601 LOG (GNUNET_ERROR_TYPE_DEBUG,
602 "Creating new set (operation %u)\n",
604 mqm = GNUNET_MQ_msg (create_msg,
605 GNUNET_MESSAGE_TYPE_SET_CREATE);
606 create_msg->operation = htonl (op);
610 LOG (GNUNET_ERROR_TYPE_DEBUG,
611 "Creating new set (lazy copy)\n",
613 mqm = GNUNET_MQ_msg (copy_msg,
614 GNUNET_MESSAGE_TYPE_SET_COPY_LAZY_CONNECT);
615 copy_msg->cookie = *cookie;
617 GNUNET_MQ_send (set->mq, mqm);
623 * Create an empty set, supporting the specified operation.
625 * @param cfg configuration to use for connecting to the
627 * @param op operation supported by the set
628 * Note that the operation has to be specified
629 * beforehand, as certain set operations need to maintain
630 * data structures spefific to the operation
631 * @return a handle to the set
633 struct GNUNET_SET_Handle *
634 GNUNET_SET_create (const struct GNUNET_CONFIGURATION_Handle *cfg,
635 enum GNUNET_SET_OperationType op)
637 return create_internal (cfg, op, NULL);
642 * Add an element to the given set. After the element has been added
643 * (in the sense of being transmitted to the set service), @a cont
644 * will be called. Multiple calls to GNUNET_SET_add_element() can be
647 * @param set set to add element to
648 * @param element element to add to the set
649 * @param cont continuation called after the element has been added
650 * @param cont_cls closure for @a cont
651 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the
652 * set is invalid (e.g. the set service crashed)
655 GNUNET_SET_add_element (struct GNUNET_SET_Handle *set,
656 const struct GNUNET_SET_Element *element,
657 GNUNET_SET_Continuation cont,
660 struct GNUNET_MQ_Envelope *mqm;
661 struct GNUNET_SET_ElementMessage *msg;
663 LOG (GNUNET_ERROR_TYPE_INFO, "adding element of type %u\n", (unsigned) element->element_type);
665 if (GNUNET_YES == set->invalid)
669 return GNUNET_SYSERR;
671 mqm = GNUNET_MQ_msg_extra (msg,
673 GNUNET_MESSAGE_TYPE_SET_ADD);
674 msg->element_type = htons (element->element_type);
675 GNUNET_memcpy (&msg[1],
678 GNUNET_MQ_notify_sent (mqm,
680 GNUNET_MQ_send (set->mq, mqm);
686 * Remove an element to the given set. After the element has been
687 * removed (in the sense of the request being transmitted to the set
688 * service), @a cont will be called. Multiple calls to
689 * GNUNET_SET_remove_element() can be queued
691 * @param set set to remove element from
692 * @param element element to remove from the set
693 * @param cont continuation called after the element has been removed
694 * @param cont_cls closure for @a cont
695 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the
696 * set is invalid (e.g. the set service crashed)
699 GNUNET_SET_remove_element (struct GNUNET_SET_Handle *set,
700 const struct GNUNET_SET_Element *element,
701 GNUNET_SET_Continuation cont,
704 struct GNUNET_MQ_Envelope *mqm;
705 struct GNUNET_SET_ElementMessage *msg;
707 if (GNUNET_YES == set->invalid)
711 return GNUNET_SYSERR;
713 mqm = GNUNET_MQ_msg_extra (msg,
715 GNUNET_MESSAGE_TYPE_SET_REMOVE);
716 msg->element_type = htons (element->element_type);
717 GNUNET_memcpy (&msg[1],
720 GNUNET_MQ_notify_sent (mqm,
722 GNUNET_MQ_send (set->mq, mqm);
728 * Destroy the set handle if no operations are left, mark the set
729 * for destruction otherwise.
731 * @param set set handle to destroy
734 GNUNET_SET_destroy (struct GNUNET_SET_Handle *set)
736 /* destroying set while iterator is active is currently
737 not supported; we should expand the API to allow
738 clients to explicitly cancel the iteration! */
739 if ( (NULL != set->ops_head) || (NULL != set->iterator) )
741 LOG (GNUNET_ERROR_TYPE_DEBUG,
742 "Set operations are pending, delaying set destruction\n");
743 set->destroy_requested = GNUNET_YES;
746 LOG (GNUNET_ERROR_TYPE_DEBUG,
747 "Really destroying set\n");
750 GNUNET_MQ_destroy (set->mq);
758 * Prepare a set operation to be evaluated with another peer.
759 * The evaluation will not start until the client provides
760 * a local set with #GNUNET_SET_commit().
762 * @param other_peer peer with the other set
763 * @param app_id hash for the application using the set
764 * @param context_msg additional information for the request
765 * @param result_mode specified how results will be returned,
766 * see `enum GNUNET_SET_ResultMode`.
767 * @param result_cb called on error or success
768 * @param result_cls closure for @e result_cb
769 * @return a handle to cancel the operation
771 struct GNUNET_SET_OperationHandle *
772 GNUNET_SET_prepare (const struct GNUNET_PeerIdentity *other_peer,
773 const struct GNUNET_HashCode *app_id,
774 const struct GNUNET_MessageHeader *context_msg,
775 enum GNUNET_SET_ResultMode result_mode,
776 struct GNUNET_SET_Option options[],
777 GNUNET_SET_ResultIterator result_cb,
780 struct GNUNET_MQ_Envelope *mqm;
781 struct GNUNET_SET_OperationHandle *oh;
782 struct GNUNET_SET_EvaluateMessage *msg;
783 struct GNUNET_SET_Option *opt;
785 LOG (GNUNET_ERROR_TYPE_DEBUG,
786 "Client prepares set operation (%d)\n",
788 oh = GNUNET_new (struct GNUNET_SET_OperationHandle);
789 oh->result_cb = result_cb;
790 oh->result_cls = result_cls;
791 mqm = GNUNET_MQ_msg_nested_mh (msg,
792 GNUNET_MESSAGE_TYPE_SET_EVALUATE,
794 msg->app_id = *app_id;
795 msg->result_mode = htonl (result_mode);
796 msg->target_peer = *other_peer;
797 for (opt = options; opt->type != 0; opt++)
801 case GNUNET_SET_OPTION_BYZANTINE:
802 msg->byzantine = GNUNET_YES;
803 msg->byzantine_lower_bound = opt->v.num;
805 case GNUNET_SET_OPTION_FORCE_FULL:
806 msg->force_full = GNUNET_YES;
808 case GNUNET_SET_OPTION_FORCE_DELTA:
809 msg->force_delta = GNUNET_YES;
812 LOG (GNUNET_ERROR_TYPE_ERROR,
813 "Option with type %d not recognized\n", (int) opt->type);
816 oh->conclude_mqm = mqm;
817 oh->request_id_addr = &msg->request_id;
824 * Connect to the set service in order to listen for requests.
826 * @param cls the `struct GNUNET_SET_ListenHandle *` to connect
829 listen_connect (void *cls);
833 * Check validity of request message for a listen operation
835 * @param cls the listen handle
836 * @param msg the message
837 * @return #GNUNET_OK if the message is well-formed
840 check_request (void *cls,
841 const struct GNUNET_SET_RequestMessage *msg)
843 const struct GNUNET_MessageHeader *context_msg;
845 if (ntohs (msg->header.size) == sizeof (*msg))
846 return GNUNET_OK; /* no context message is OK */
847 context_msg = GNUNET_MQ_extract_nested_mh (msg);
848 if (NULL == context_msg)
850 /* malformed context message is NOT ok */
852 return GNUNET_SYSERR;
859 * Handle request message for a listen operation
861 * @param cls the listen handle
862 * @param msg the message
865 handle_request (void *cls,
866 const struct GNUNET_SET_RequestMessage *msg)
868 struct GNUNET_SET_ListenHandle *lh = cls;
869 struct GNUNET_SET_Request req;
870 const struct GNUNET_MessageHeader *context_msg;
871 struct GNUNET_MQ_Envelope *mqm;
872 struct GNUNET_SET_RejectMessage *rmsg;
874 LOG (GNUNET_ERROR_TYPE_DEBUG,
875 "Processing incoming operation request\n");
876 /* we got another valid request => reset the backoff */
877 lh->reconnect_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
878 req.accept_id = ntohl (msg->accept_id);
879 req.accepted = GNUNET_NO;
880 context_msg = GNUNET_MQ_extract_nested_mh (msg);
881 /* calling #GNUNET_SET_accept() in the listen cb will set req->accepted */
882 lh->listen_cb (lh->listen_cls,
886 if (GNUNET_YES == req.accepted)
887 return; /* the accept-case is handled in #GNUNET_SET_accept() */
888 LOG (GNUNET_ERROR_TYPE_DEBUG,
889 "Rejecting request\n");
890 mqm = GNUNET_MQ_msg (rmsg,
891 GNUNET_MESSAGE_TYPE_SET_REJECT);
892 rmsg->accept_reject_id = msg->accept_id;
893 GNUNET_MQ_send (lh->mq, mqm);
898 * Our connection with the set service encountered an error,
899 * re-initialize with exponential back-off.
901 * @param cls the `struct GNUNET_SET_ListenHandle *`
902 * @param error reason for the disconnect
905 handle_client_listener_error (void *cls,
906 enum GNUNET_MQ_Error error)
908 struct GNUNET_SET_ListenHandle *lh = cls;
910 LOG (GNUNET_ERROR_TYPE_DEBUG,
911 "Listener broke down (%d), re-connecting\n",
913 GNUNET_MQ_destroy (lh->mq);
915 lh->reconnect_task = GNUNET_SCHEDULER_add_delayed (lh->reconnect_backoff,
918 lh->reconnect_backoff = GNUNET_TIME_STD_BACKOFF (lh->reconnect_backoff);
923 * Connect to the set service in order to listen for requests.
925 * @param cls the `struct GNUNET_SET_ListenHandle *` to connect
928 listen_connect (void *cls)
930 struct GNUNET_SET_ListenHandle *lh = cls;
931 struct GNUNET_MQ_MessageHandler mq_handlers[] = {
932 GNUNET_MQ_hd_var_size (request,
933 GNUNET_MESSAGE_TYPE_SET_REQUEST,
934 struct GNUNET_SET_RequestMessage,
936 GNUNET_MQ_handler_end ()
938 struct GNUNET_MQ_Envelope *mqm;
939 struct GNUNET_SET_ListenMessage *msg;
941 lh->reconnect_task = NULL;
942 GNUNET_assert (NULL == lh->mq);
943 lh->mq = GNUNET_CLIENT_connect (lh->cfg,
946 &handle_client_listener_error,
950 mqm = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_SET_LISTEN);
951 msg->operation = htonl (lh->operation);
952 msg->app_id = lh->app_id;
953 GNUNET_MQ_send (lh->mq,
959 * Wait for set operation requests for the given application id
961 * @param cfg configuration to use for connecting to
962 * the set service, needs to be valid for the lifetime of the listen handle
963 * @param operation operation we want to listen for
964 * @param app_id id of the application that handles set operation requests
965 * @param listen_cb called for each incoming request matching the operation
967 * @param listen_cls handle for @a listen_cb
968 * @return a handle that can be used to cancel the listen operation
970 struct GNUNET_SET_ListenHandle *
971 GNUNET_SET_listen (const struct GNUNET_CONFIGURATION_Handle *cfg,
972 enum GNUNET_SET_OperationType operation,
973 const struct GNUNET_HashCode *app_id,
974 GNUNET_SET_ListenCallback listen_cb,
977 struct GNUNET_SET_ListenHandle *lh;
979 lh = GNUNET_new (struct GNUNET_SET_ListenHandle);
980 lh->listen_cb = listen_cb;
981 lh->listen_cls = listen_cls;
983 lh->operation = operation;
984 lh->app_id = *app_id;
985 lh->reconnect_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
997 * Cancel the given listen operation.
999 * @param lh handle for the listen operation
1002 GNUNET_SET_listen_cancel (struct GNUNET_SET_ListenHandle *lh)
1004 LOG (GNUNET_ERROR_TYPE_DEBUG,
1005 "Canceling listener\n");
1008 GNUNET_MQ_destroy (lh->mq);
1011 if (NULL != lh->reconnect_task)
1013 GNUNET_SCHEDULER_cancel (lh->reconnect_task);
1014 lh->reconnect_task = NULL;
1021 * Accept a request we got via #GNUNET_SET_listen. Must be called during
1022 * #GNUNET_SET_listen, as the 'struct GNUNET_SET_Request' becomes invalid
1024 * Call #GNUNET_SET_commit to provide the local set to use for the operation,
1025 * and to begin the exchange with the remote peer.
1027 * @param request request to accept
1028 * @param result_mode specified how results will be returned,
1029 * see `enum GNUNET_SET_ResultMode`.
1030 * @param result_cb callback for the results
1031 * @param result_cls closure for @a result_cb
1032 * @return a handle to cancel the operation
1034 struct GNUNET_SET_OperationHandle *
1035 GNUNET_SET_accept (struct GNUNET_SET_Request *request,
1036 enum GNUNET_SET_ResultMode result_mode,
1037 struct GNUNET_SET_Option options[],
1038 GNUNET_SET_ResultIterator result_cb,
1041 struct GNUNET_MQ_Envelope *mqm;
1042 struct GNUNET_SET_OperationHandle *oh;
1043 struct GNUNET_SET_AcceptMessage *msg;
1045 GNUNET_assert (GNUNET_NO == request->accepted);
1046 LOG (GNUNET_ERROR_TYPE_DEBUG,
1047 "Client accepts set operation (%d)\n",
1049 request->accepted = GNUNET_YES;
1050 mqm = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_SET_ACCEPT);
1051 msg->accept_reject_id = htonl (request->accept_id);
1052 msg->result_mode = htonl (result_mode);
1053 oh = GNUNET_new (struct GNUNET_SET_OperationHandle);
1054 oh->result_cb = result_cb;
1055 oh->result_cls = result_cls;
1056 oh->conclude_mqm = mqm;
1057 oh->request_id_addr = &msg->request_id;
1063 * Commit a set to be used with a set operation.
1064 * This function is called once we have fully constructed
1065 * the set that we want to use for the operation. At this
1066 * time, the P2P protocol can then begin to exchange the
1067 * set information and call the result callback with the
1068 * result information.
1070 * @param oh handle to the set operation
1071 * @param set the set to use for the operation
1072 * @return #GNUNET_OK on success, #GNUNET_SYSERR if the
1073 * set is invalid (e.g. the set service crashed)
1076 GNUNET_SET_commit (struct GNUNET_SET_OperationHandle *oh,
1077 struct GNUNET_SET_Handle *set)
1079 if (NULL != oh->set)
1081 /* Some other set was already commited for this
1082 * operation, there is a logic bug in the client of this API */
1086 if (GNUNET_YES == set->invalid)
1087 return GNUNET_SYSERR;
1088 LOG (GNUNET_ERROR_TYPE_DEBUG,
1089 "Client commits to SET\n");
1090 GNUNET_assert (NULL != oh->conclude_mqm);
1092 GNUNET_CONTAINER_DLL_insert (set->ops_head,
1095 oh->request_id = GNUNET_MQ_assoc_add (set->mq,
1097 *oh->request_id_addr = htonl (oh->request_id);
1098 GNUNET_MQ_send (set->mq,
1100 oh->conclude_mqm = NULL;
1101 oh->request_id_addr = NULL;
1107 * Iterate over all elements in the given set. Note that this
1108 * operation involves transferring every element of the set from the
1109 * service to the client, and is thus costly.
1111 * @param set the set to iterate over
1112 * @param iter the iterator to call for each element
1113 * @param iter_cls closure for @a iter
1114 * @return #GNUNET_YES if the iteration started successfuly,
1115 * #GNUNET_NO if another iteration is active
1116 * #GNUNET_SYSERR if the set is invalid (e.g. the server crashed, disconnected)
1119 GNUNET_SET_iterate (struct GNUNET_SET_Handle *set,
1120 GNUNET_SET_ElementIterator iter,
1123 struct GNUNET_MQ_Envelope *ev;
1125 GNUNET_assert (NULL != iter);
1126 if (GNUNET_YES == set->invalid)
1127 return GNUNET_SYSERR;
1128 if (NULL != set->iterator)
1130 LOG (GNUNET_ERROR_TYPE_DEBUG,
1131 "Iterating over set\n");
1132 set->iterator = iter;
1133 set->iterator_cls = iter_cls;
1134 ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_SET_ITER_REQUEST);
1135 GNUNET_MQ_send (set->mq, ev);
1141 GNUNET_SET_copy_lazy (struct GNUNET_SET_Handle *set,
1142 GNUNET_SET_CopyReadyCallback cb,
1145 struct GNUNET_MQ_Envelope *ev;
1146 struct SetCopyRequest *req;
1148 ev = GNUNET_MQ_msg_header (GNUNET_MESSAGE_TYPE_SET_COPY_LAZY_PREPARE);
1149 GNUNET_MQ_send (set->mq, ev);
1151 req = GNUNET_new (struct SetCopyRequest);
1154 GNUNET_CONTAINER_DLL_insert (set->copy_req_head,
1161 * Create a copy of an element. The copy
1162 * must be GNUNET_free-d by the caller.
1164 * @param element the element to copy
1165 * @return the copied element
1167 struct GNUNET_SET_Element *
1168 GNUNET_SET_element_dup (const struct GNUNET_SET_Element *element)
1170 struct GNUNET_SET_Element *copy;
1172 copy = GNUNET_malloc (element->size + sizeof (struct GNUNET_SET_Element));
1173 copy->size = element->size;
1174 copy->element_type = element->element_type;
1175 copy->data = ©[1];
1176 GNUNET_memcpy (©[1],
1184 * Hash a set element.
1186 * @param element the element that should be hashed
1187 * @param[out] ret_hash a pointer to where the hash of @a element
1191 GNUNET_SET_element_hash (const struct GNUNET_SET_Element *element,
1192 struct GNUNET_HashCode *ret_hash)
1194 struct GNUNET_HashContext *ctx = GNUNET_CRYPTO_hash_context_start ();
1196 /* It's not guaranteed that the element data is always after the element header,
1197 so we need to hash the chunks separately. */
1198 GNUNET_CRYPTO_hash_context_read (ctx, &element->size, sizeof (uint16_t));
1199 GNUNET_CRYPTO_hash_context_read (ctx, &element->element_type, sizeof (uint16_t));
1200 GNUNET_CRYPTO_hash_context_read (ctx, element->data, element->size);
1201 GNUNET_CRYPTO_hash_context_finish (ctx, ret_hash);
1204 /* end of set_api.c */