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3 Copyright (C) 2012-2019 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
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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 Affero General Public License for more details.
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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
22 * @author Florian Dold
24 * @brief general purpose request queue
27 #include "gnunet_util_lib.h"
29 #define LOG(kind, ...) GNUNET_log_from (kind, "util-mq", __VA_ARGS__)
32 struct GNUNET_MQ_Envelope
35 * Messages are stored in a linked list.
36 * Each queue has its own list of envelopes.
38 struct GNUNET_MQ_Envelope *next;
41 * Messages are stored in a linked list
42 * Each queue has its own list of envelopes.
44 struct GNUNET_MQ_Envelope *prev;
47 * Actual allocated message header.
48 * The GNUNET_MQ_Envelope header is allocated at
49 * the end of the message.
51 struct GNUNET_MessageHeader *mh;
54 * Queue the message is queued in, NULL if message is not queued.
56 struct GNUNET_MQ_Handle *parent_queue;
59 * Called after the message was sent irrevocably.
61 GNUNET_SCHEDULER_TaskCallback sent_cb;
64 * Closure for @e send_cb
69 * Flags that were set for this envelope by
70 * #GNUNET_MQ_env_set_options(). Only valid if
71 * @e have_custom_options is set.
73 enum GNUNET_MQ_PriorityPreferences priority;
76 * Did the application call #GNUNET_MQ_env_set_options()?
78 int have_custom_options;
83 * Handle to a message queue.
85 struct GNUNET_MQ_Handle
88 * Handlers array, or NULL if the queue should not receive messages
90 struct GNUNET_MQ_MessageHandler *handlers;
93 * Actual implementation of message sending,
94 * called when a message is added
96 GNUNET_MQ_SendImpl send_impl;
99 * Implementation-dependent queue destruction function
101 GNUNET_MQ_DestroyImpl destroy_impl;
104 * Implementation-dependent send cancel function
106 GNUNET_MQ_CancelImpl cancel_impl;
109 * Implementation-specific state
114 * Callback will be called when an error occurs.
116 GNUNET_MQ_ErrorHandler error_handler;
119 * Closure for the error handler.
121 void *error_handler_cls;
124 * Task to asynchronously run #impl_send_continue().
126 struct GNUNET_SCHEDULER_Task *send_task;
129 * Linked list of messages pending to be sent
131 struct GNUNET_MQ_Envelope *envelope_head;
134 * Linked list of messages pending to be sent
136 struct GNUNET_MQ_Envelope *envelope_tail;
139 * Message that is currently scheduled to be
140 * sent. Not the head of the message queue, as the implementation
141 * needs to know if sending has been already scheduled or not.
143 struct GNUNET_MQ_Envelope *current_envelope;
146 * Map of associations, lazily allocated
148 struct GNUNET_CONTAINER_MultiHashMap32 *assoc_map;
151 * Functions to call on queue destruction; kept in a DLL.
153 struct GNUNET_MQ_DestroyNotificationHandle *dnh_head;
156 * Functions to call on queue destruction; kept in a DLL.
158 struct GNUNET_MQ_DestroyNotificationHandle *dnh_tail;
161 * Flags that were set for this queue by
162 * #GNUNET_MQ_set_options(). Default is 0.
164 enum GNUNET_MQ_PriorityPreferences priority;
167 * Next id that should be used for the @e assoc_map,
168 * initialized lazily to a random value together with
174 * Number of entries we have in the envelope-DLL.
176 unsigned int queue_length;
179 * #GNUNET_YES if GNUNET_MQ_impl_evacuate was called.
180 * FIXME: is this dead?
185 * #GNUNET_YES if GNUNET_MQ_impl_send_in_flight() was called.
192 * Call the message message handler that was registered
193 * for the type of the given message in the given message queue.
195 * This function is indended to be used for the implementation
198 * @param mq message queue with the handlers
199 * @param mh message to dispatch
202 GNUNET_MQ_inject_message (struct GNUNET_MQ_Handle *mq,
203 const struct GNUNET_MessageHeader *mh)
207 ret = GNUNET_MQ_handle_message (mq->handlers, mh);
208 if (GNUNET_SYSERR == ret)
210 GNUNET_MQ_inject_error (mq, GNUNET_MQ_ERROR_MALFORMED);
217 * Call the message message handler that was registered
218 * for the type of the given message in the given @a handlers list.
220 * This function is indended to be used for the implementation
223 * @param handlers a set of handlers
224 * @param mh message to dispatch
225 * @return #GNUNET_OK on success, #GNUNET_NO if no handler matched,
226 * #GNUNET_SYSERR if message was rejected by check function
229 GNUNET_MQ_handle_message (const struct GNUNET_MQ_MessageHandler *handlers,
230 const struct GNUNET_MessageHeader *mh)
232 const struct GNUNET_MQ_MessageHandler *handler;
233 int handled = GNUNET_NO;
234 uint16_t msize = ntohs (mh->size);
235 uint16_t mtype = ntohs (mh->type);
237 LOG (GNUNET_ERROR_TYPE_DEBUG,
238 "Received message of type %u and size %u\n",
242 if (NULL == handlers)
244 for (handler = handlers; NULL != handler->cb; handler++)
246 if (handler->type == mtype)
248 handled = GNUNET_YES;
249 if ((handler->expected_size > msize) ||
250 ((handler->expected_size != msize) && (NULL == handler->mv)))
252 /* Too small, or not an exact size and
253 no 'mv' handler to check rest */
254 LOG (GNUNET_ERROR_TYPE_ERROR,
255 "Received malformed message of type %u\n",
256 (unsigned int) handler->type);
257 return GNUNET_SYSERR;
259 if ((NULL == handler->mv) ||
260 (GNUNET_OK == handler->mv (handler->cls, mh)))
262 /* message well-formed, pass to handler */
263 handler->cb (handler->cls, mh);
267 /* Message rejected by check routine */
268 LOG (GNUNET_ERROR_TYPE_ERROR,
269 "Received malformed message of type %u\n",
270 (unsigned int) handler->type);
271 return GNUNET_SYSERR;
277 if (GNUNET_NO == handled)
279 LOG (GNUNET_ERROR_TYPE_INFO,
280 "No handler for message of type %u and size %u\n",
290 * Call the error handler of a message queue with the given
291 * error code. If there is no error handler, log a warning.
293 * This function is intended to be used by the implementation
296 * @param mq message queue
297 * @param error the error type
300 GNUNET_MQ_inject_error (struct GNUNET_MQ_Handle *mq,
301 enum GNUNET_MQ_Error error)
303 if (NULL == mq->error_handler)
305 LOG (GNUNET_ERROR_TYPE_WARNING,
306 "Got error %d, but no handler installed\n",
310 mq->error_handler (mq->error_handler_cls,
316 * Discard the message queue message, free all
317 * allocated resources. Must be called in the event
318 * that a message is created but should not actually be sent.
320 * @param mqm the message to discard
323 GNUNET_MQ_discard (struct GNUNET_MQ_Envelope *ev)
325 GNUNET_assert (NULL == ev->parent_queue);
331 * Obtain the current length of the message queue.
333 * @param mq queue to inspect
334 * @return number of queued, non-transmitted messages
337 GNUNET_MQ_get_length (struct GNUNET_MQ_Handle *mq)
339 if (GNUNET_YES != mq->in_flight)
341 return mq->queue_length;
343 return mq->queue_length - 1;
348 * Send a message with the given message queue.
349 * May only be called once per message.
351 * @param mq message queue
352 * @param ev the envelope with the message to send.
355 GNUNET_MQ_send (struct GNUNET_MQ_Handle *mq,
356 struct GNUNET_MQ_Envelope *ev)
358 GNUNET_assert (NULL != mq);
359 GNUNET_assert (NULL == ev->parent_queue);
362 if (mq->queue_length >= 10000)
364 /* This would seem like a bug... */
365 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
366 "MQ with %u entries extended by message of type %u (FC broken?)\n",
367 (unsigned int) mq->queue_length,
368 (unsigned int) ntohs (ev->mh->type));
370 ev->parent_queue = mq;
371 /* is the implementation busy? queue it! */
372 if ((NULL != mq->current_envelope) || (NULL != mq->send_task))
374 GNUNET_CONTAINER_DLL_insert_tail (mq->envelope_head,
379 GNUNET_assert (NULL == mq->envelope_head);
380 mq->current_envelope = ev;
382 LOG (GNUNET_ERROR_TYPE_DEBUG,
383 "sending message of type %u, queue empty (MQ: %p)\n",
384 ntohs (ev->mh->type),
394 * Remove the first envelope that has not yet been sent from the message
395 * queue and return it.
397 * @param mq queue to remove envelope from
398 * @return NULL if queue is empty (or has no envelope that is not under transmission)
400 struct GNUNET_MQ_Envelope *
401 GNUNET_MQ_unsent_head (struct GNUNET_MQ_Handle *mq)
403 struct GNUNET_MQ_Envelope *env;
405 env = mq->envelope_head;
406 GNUNET_CONTAINER_DLL_remove (mq->envelope_head, mq->envelope_tail, env);
408 env->parent_queue = NULL;
414 * Function to copy an envelope. The envelope must not yet
415 * be in any queue or have any options or callbacks set.
417 * @param env envelope to copy
418 * @return copy of @a env
420 struct GNUNET_MQ_Envelope *
421 GNUNET_MQ_env_copy (struct GNUNET_MQ_Envelope *env)
423 GNUNET_assert (NULL == env->next);
424 GNUNET_assert (NULL == env->parent_queue);
425 GNUNET_assert (NULL == env->sent_cb);
426 GNUNET_assert (GNUNET_NO == env->have_custom_options);
427 return GNUNET_MQ_msg_copy (env->mh);
432 * Send a copy of a message with the given message queue.
433 * Can be called repeatedly on the same envelope.
435 * @param mq message queue
436 * @param ev the envelope with the message to send.
439 GNUNET_MQ_send_copy (struct GNUNET_MQ_Handle *mq,
440 const struct GNUNET_MQ_Envelope *ev)
442 struct GNUNET_MQ_Envelope *env;
445 msize = ntohs (ev->mh->size);
446 env = GNUNET_malloc (sizeof(struct GNUNET_MQ_Envelope) + msize);
447 env->mh = (struct GNUNET_MessageHeader *) &env[1];
448 env->sent_cb = ev->sent_cb;
449 env->sent_cls = ev->sent_cls;
450 GNUNET_memcpy (&env[1], ev->mh, msize);
451 GNUNET_MQ_send (mq, env);
456 * Task run to call the send implementation for the next queued
457 * message, if any. Only useful for implementing message queues,
458 * results in undefined behavior if not used carefully.
460 * @param cls message queue to send the next message with
463 impl_send_continue (void *cls)
465 struct GNUNET_MQ_Handle *mq = cls;
467 mq->send_task = NULL;
468 /* call is only valid if we're actually currently sending
470 if (NULL == mq->envelope_head)
472 mq->current_envelope = mq->envelope_head;
473 GNUNET_CONTAINER_DLL_remove (mq->envelope_head,
475 mq->current_envelope);
477 LOG (GNUNET_ERROR_TYPE_DEBUG,
478 "sending message of type %u from queue\n",
479 ntohs (mq->current_envelope->mh->type));
482 mq->current_envelope->mh,
488 * Call the send implementation for the next queued message, if any.
489 * Only useful for implementing message queues, results in undefined
490 * behavior if not used carefully.
492 * @param mq message queue to send the next message with
495 GNUNET_MQ_impl_send_continue (struct GNUNET_MQ_Handle *mq)
497 struct GNUNET_MQ_Envelope *current_envelope;
498 GNUNET_SCHEDULER_TaskCallback cb;
500 GNUNET_assert (0 < mq->queue_length);
502 mq->in_flight = GNUNET_NO;
503 current_envelope = mq->current_envelope;
504 current_envelope->parent_queue = NULL;
505 mq->current_envelope = NULL;
506 GNUNET_assert (NULL == mq->send_task);
507 mq->send_task = GNUNET_SCHEDULER_add_now (&impl_send_continue, mq);
508 if (NULL != (cb = current_envelope->sent_cb))
510 current_envelope->sent_cb = NULL;
511 cb (current_envelope->sent_cls);
513 GNUNET_free (current_envelope);
518 * Call the send notification for the current message, but do not
519 * try to send the next message until #GNUNET_MQ_impl_send_continue
522 * Only useful for implementing message queues, results in undefined
523 * behavior if not used carefully.
525 * @param mq message queue to send the next message with
528 GNUNET_MQ_impl_send_in_flight (struct GNUNET_MQ_Handle *mq)
530 struct GNUNET_MQ_Envelope *current_envelope;
531 GNUNET_SCHEDULER_TaskCallback cb;
533 mq->in_flight = GNUNET_YES;
534 /* call is only valid if we're actually currently sending
536 current_envelope = mq->current_envelope;
537 GNUNET_assert (NULL != current_envelope);
538 /* can't call cancel from now on anymore */
539 current_envelope->parent_queue = NULL;
540 if (NULL != (cb = current_envelope->sent_cb))
542 current_envelope->sent_cb = NULL;
543 cb (current_envelope->sent_cls);
549 * Create a message queue for the specified handlers.
551 * @param send function the implements sending messages
552 * @param destroy function that implements destroying the queue
553 * @param cancel function that implements canceling a message
554 * @param impl_state for the queue, passed to 'send' and 'destroy'
555 * @param handlers array of message handlers
556 * @param error_handler handler for read and write errors
557 * @param error_handler_cls closure for @a error_handler
558 * @return a new message queue
560 struct GNUNET_MQ_Handle *
561 GNUNET_MQ_queue_for_callbacks (GNUNET_MQ_SendImpl send,
562 GNUNET_MQ_DestroyImpl destroy,
563 GNUNET_MQ_CancelImpl cancel,
565 const struct GNUNET_MQ_MessageHandler *handlers,
566 GNUNET_MQ_ErrorHandler error_handler,
567 void *error_handler_cls)
569 struct GNUNET_MQ_Handle *mq;
571 mq = GNUNET_new (struct GNUNET_MQ_Handle);
572 mq->send_impl = send;
573 mq->destroy_impl = destroy;
574 mq->cancel_impl = cancel;
575 mq->handlers = GNUNET_MQ_copy_handlers (handlers);
576 mq->error_handler = error_handler;
577 mq->error_handler_cls = error_handler_cls;
578 mq->impl_state = impl_state;
585 * Change the closure argument in all of the `handlers` of the
588 * @param mq to modify
589 * @param handlers_cls new closure to use
592 GNUNET_MQ_set_handlers_closure (struct GNUNET_MQ_Handle *mq, void *handlers_cls)
594 if (NULL == mq->handlers)
596 for (unsigned int i = 0; NULL != mq->handlers[i].cb; i++)
597 mq->handlers[i].cls = handlers_cls;
602 * Get the message that should currently be sent.
603 * Fails if there is no current message.
604 * Only useful for implementing message queues,
605 * results in undefined behavior if not used carefully.
607 * @param mq message queue with the current message
608 * @return message to send, never NULL
610 const struct GNUNET_MessageHeader *
611 GNUNET_MQ_impl_current (struct GNUNET_MQ_Handle *mq)
613 GNUNET_assert (NULL != mq->current_envelope);
614 GNUNET_assert (NULL != mq->current_envelope->mh);
615 return mq->current_envelope->mh;
620 * Get the implementation state associated with the
623 * While the GNUNET_MQ_Impl* callbacks receive the
624 * implementation state, continuations that are scheduled
625 * by the implementation function often only have one closure
626 * argument, with this function it is possible to get at the
627 * implementation state when only passing the GNUNET_MQ_Handle
630 * @param mq message queue with the current message
631 * @return message to send, never NULL
634 GNUNET_MQ_impl_state (struct GNUNET_MQ_Handle *mq)
636 return mq->impl_state;
640 struct GNUNET_MQ_Envelope *
641 GNUNET_MQ_msg_ (struct GNUNET_MessageHeader **mhp, uint16_t size, uint16_t type)
643 struct GNUNET_MQ_Envelope *ev;
645 ev = GNUNET_malloc (size + sizeof(struct GNUNET_MQ_Envelope));
646 ev->mh = (struct GNUNET_MessageHeader *) &ev[1];
647 ev->mh->size = htons (size);
648 ev->mh->type = htons (type);
656 * Create a new envelope by copying an existing message.
658 * @param hdr header of the message to copy
659 * @return envelope containing @a hdr
661 struct GNUNET_MQ_Envelope *
662 GNUNET_MQ_msg_copy (const struct GNUNET_MessageHeader *hdr)
664 struct GNUNET_MQ_Envelope *mqm;
665 uint16_t size = ntohs (hdr->size);
667 mqm = GNUNET_malloc (sizeof(*mqm) + size);
668 mqm->mh = (struct GNUNET_MessageHeader *) &mqm[1];
669 GNUNET_memcpy (mqm->mh, hdr, size);
675 * Implementation of the #GNUNET_MQ_msg_nested_mh macro.
677 * @param mhp pointer to the message header pointer that will be changed to allocate at
678 * the newly allocated space for the message.
679 * @param base_size size of the data before the nested message
680 * @param type type of the message in the envelope
681 * @param nested_mh the message to append to the message after base_size
683 struct GNUNET_MQ_Envelope *
684 GNUNET_MQ_msg_nested_mh_ (struct GNUNET_MessageHeader **mhp,
687 const struct GNUNET_MessageHeader *nested_mh)
689 struct GNUNET_MQ_Envelope *mqm;
692 if (NULL == nested_mh)
693 return GNUNET_MQ_msg_ (mhp, base_size, type);
695 size = base_size + ntohs (nested_mh->size);
697 /* check for uint16_t overflow */
698 if (size < base_size)
701 mqm = GNUNET_MQ_msg_ (mhp, size, type);
702 GNUNET_memcpy ((char *) mqm->mh + base_size,
704 ntohs (nested_mh->size));
711 * Associate the assoc_data in mq with a unique request id.
713 * @param mq message queue, id will be unique for the queue
714 * @param assoc_data to associate
717 GNUNET_MQ_assoc_add (struct GNUNET_MQ_Handle *mq, void *assoc_data)
721 if (NULL == mq->assoc_map)
723 mq->assoc_map = GNUNET_CONTAINER_multihashmap32_create (8);
727 GNUNET_assert (GNUNET_OK ==
728 GNUNET_CONTAINER_multihashmap32_put (
732 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
738 * Get the data associated with a @a request_id in a queue
740 * @param mq the message queue with the association
741 * @param request_id the request id we are interested in
742 * @return the associated data
745 GNUNET_MQ_assoc_get (struct GNUNET_MQ_Handle *mq, uint32_t request_id)
747 if (NULL == mq->assoc_map)
749 return GNUNET_CONTAINER_multihashmap32_get (mq->assoc_map, request_id);
754 * Remove the association for a @a request_id
756 * @param mq the message queue with the association
757 * @param request_id the request id we want to remove
758 * @return the associated data
761 GNUNET_MQ_assoc_remove (struct GNUNET_MQ_Handle *mq, uint32_t request_id)
765 if (NULL == mq->assoc_map)
767 val = GNUNET_CONTAINER_multihashmap32_get (mq->assoc_map, request_id);
768 GNUNET_CONTAINER_multihashmap32_remove_all (mq->assoc_map, request_id);
774 * Call a callback once the envelope has been sent, that is,
775 * sending it can not be canceled anymore.
776 * There can be only one notify sent callback per envelope.
778 * @param ev message to call the notify callback for
779 * @param cb the notify callback
780 * @param cb_cls closure for the callback
783 GNUNET_MQ_notify_sent (struct GNUNET_MQ_Envelope *ev,
784 GNUNET_SCHEDULER_TaskCallback cb,
787 /* allow setting *OR* clearing callback */
788 GNUNET_assert ((NULL == ev->sent_cb) || (NULL == cb));
790 ev->sent_cls = cb_cls;
795 * Handle we return for callbacks registered to be
796 * notified when #GNUNET_MQ_destroy() is called on a queue.
798 struct GNUNET_MQ_DestroyNotificationHandle
803 struct GNUNET_MQ_DestroyNotificationHandle *prev;
808 struct GNUNET_MQ_DestroyNotificationHandle *next;
811 * Queue to notify about.
813 struct GNUNET_MQ_Handle *mq;
818 GNUNET_SCHEDULER_TaskCallback cb;
828 * Destroy the message queue.
830 * @param mq message queue to destroy
833 GNUNET_MQ_destroy (struct GNUNET_MQ_Handle *mq)
835 struct GNUNET_MQ_DestroyNotificationHandle *dnh;
837 if (NULL != mq->destroy_impl)
839 mq->destroy_impl (mq, mq->impl_state);
841 if (NULL != mq->send_task)
843 GNUNET_SCHEDULER_cancel (mq->send_task);
844 mq->send_task = NULL;
846 while (NULL != mq->envelope_head)
848 struct GNUNET_MQ_Envelope *ev;
850 ev = mq->envelope_head;
851 ev->parent_queue = NULL;
852 GNUNET_CONTAINER_DLL_remove (mq->envelope_head, mq->envelope_tail, ev);
853 GNUNET_assert (0 < mq->queue_length);
855 LOG (GNUNET_ERROR_TYPE_DEBUG,
856 "MQ destroy drops message of type %u\n",
857 ntohs (ev->mh->type));
858 GNUNET_MQ_discard (ev);
860 if (NULL != mq->current_envelope)
862 /* we can only discard envelopes that
864 mq->current_envelope->parent_queue = NULL;
865 LOG (GNUNET_ERROR_TYPE_DEBUG,
866 "MQ destroy drops current message of type %u\n",
867 ntohs (mq->current_envelope->mh->type));
868 GNUNET_MQ_discard (mq->current_envelope);
869 mq->current_envelope = NULL;
870 GNUNET_assert (0 < mq->queue_length);
873 GNUNET_assert (0 == mq->queue_length);
874 while (NULL != (dnh = mq->dnh_head))
876 dnh->cb (dnh->cb_cls);
877 GNUNET_MQ_destroy_notify_cancel (dnh);
879 if (NULL != mq->assoc_map)
881 GNUNET_CONTAINER_multihashmap32_destroy (mq->assoc_map);
882 mq->assoc_map = NULL;
884 GNUNET_free_non_null (mq->handlers);
889 const struct GNUNET_MessageHeader *
890 GNUNET_MQ_extract_nested_mh_ (const struct GNUNET_MessageHeader *mh,
894 uint16_t nested_size;
895 const struct GNUNET_MessageHeader *nested_msg;
897 whole_size = ntohs (mh->size);
898 GNUNET_assert (whole_size >= base_size);
899 nested_size = whole_size - base_size;
900 if (0 == nested_size)
902 if (nested_size < sizeof(struct GNUNET_MessageHeader))
907 nested_msg = (const struct GNUNET_MessageHeader *) ((char *) mh + base_size);
908 if (ntohs (nested_msg->size) != nested_size)
918 * Cancel sending the message. Message must have been sent with
919 * #GNUNET_MQ_send before. May not be called after the notify sent
920 * callback has been called
922 * @param ev queued envelope to cancel
925 GNUNET_MQ_send_cancel (struct GNUNET_MQ_Envelope *ev)
927 struct GNUNET_MQ_Handle *mq = ev->parent_queue;
929 GNUNET_assert (NULL != mq);
930 GNUNET_assert (NULL != mq->cancel_impl);
932 mq->evacuate_called = GNUNET_NO;
934 if (mq->current_envelope == ev)
936 /* complex case, we already started with transmitting
937 the message using the callbacks. */
938 GNUNET_assert (GNUNET_NO == mq->in_flight);
939 GNUNET_assert (0 < mq->queue_length);
943 /* continue sending the next message, if any */
944 mq->current_envelope = mq->envelope_head;
945 if (NULL != mq->current_envelope)
947 GNUNET_CONTAINER_DLL_remove (mq->envelope_head,
949 mq->current_envelope);
951 LOG (GNUNET_ERROR_TYPE_DEBUG,
952 "sending canceled message of type %u queue\n",
953 ntohs (ev->mh->type));
955 mq->current_envelope->mh,
961 /* simple case, message is still waiting in the queue */
962 GNUNET_CONTAINER_DLL_remove (mq->envelope_head,
965 GNUNET_assert (0 < mq->queue_length);
969 if (GNUNET_YES != mq->evacuate_called)
971 ev->parent_queue = NULL;
980 * Function to obtain the current envelope
981 * from within #GNUNET_MQ_SendImpl implementations.
983 * @param mq message queue to interrogate
984 * @return the current envelope
986 struct GNUNET_MQ_Envelope *
987 GNUNET_MQ_get_current_envelope (struct GNUNET_MQ_Handle *mq)
989 return mq->current_envelope;
994 * Function to obtain the last envelope in the queue.
996 * @param mq message queue to interrogate
997 * @return the last envelope in the queue
999 struct GNUNET_MQ_Envelope *
1000 GNUNET_MQ_get_last_envelope (struct GNUNET_MQ_Handle *mq)
1002 if (NULL != mq->envelope_tail)
1003 return mq->envelope_tail;
1005 return mq->current_envelope;
1010 * Set application-specific preferences for this envelope.
1011 * Overrides the options set for the queue with
1012 * #GNUNET_MQ_set_options() for this message only.
1014 * @param env message to set options for
1015 * @param pp priorities and preferences to apply
1018 GNUNET_MQ_env_set_options (struct GNUNET_MQ_Envelope *env,
1019 enum GNUNET_MQ_PriorityPreferences pp)
1022 env->have_custom_options = GNUNET_YES;
1027 * Get application-specific options for this envelope.
1029 * @param env message to set options for
1030 * @return priorities and preferences to apply for @a env
1032 enum GNUNET_MQ_PriorityPreferences
1033 GNUNET_MQ_env_get_options (struct GNUNET_MQ_Envelope *env)
1035 struct GNUNET_MQ_Handle *mq = env->parent_queue;
1037 if (GNUNET_YES == env->have_custom_options)
1038 return env->priority;
1041 return mq->priority;
1046 * Combine performance preferences set for different
1047 * envelopes that are being combined into one larger envelope.
1049 * @param p1 one set of preferences
1050 * @param p2 second set of preferences
1051 * @return combined priority and preferences to use
1053 enum GNUNET_MQ_PriorityPreferences
1054 GNUNET_MQ_env_combine_options (enum GNUNET_MQ_PriorityPreferences p1,
1055 enum GNUNET_MQ_PriorityPreferences p2)
1057 enum GNUNET_MQ_PriorityPreferences ret;
1059 ret = GNUNET_MAX (p1 & GNUNET_MQ_PRIORITY_MASK, p2 & GNUNET_MQ_PRIORITY_MASK);
1060 ret |= ((p1 & GNUNET_MQ_PREF_UNRELIABLE) & (p2 & GNUNET_MQ_PREF_UNRELIABLE));
1062 ((p1 & GNUNET_MQ_PREF_LOW_LATENCY) | (p2 & GNUNET_MQ_PREF_LOW_LATENCY));
1064 ((p1 & GNUNET_MQ_PREF_CORK_ALLOWED) & (p2 & GNUNET_MQ_PREF_CORK_ALLOWED));
1065 ret |= ((p1 & GNUNET_MQ_PREF_GOODPUT) & (p2 & GNUNET_MQ_PREF_GOODPUT));
1067 ((p1 & GNUNET_MQ_PREF_OUT_OF_ORDER) & (p2 & GNUNET_MQ_PREF_OUT_OF_ORDER));
1073 * Set application-specific default options for this queue.
1075 * @param mq message queue to set options for
1076 * @param pp priorities and preferences to apply
1079 GNUNET_MQ_set_options (struct GNUNET_MQ_Handle *mq,
1080 enum GNUNET_MQ_PriorityPreferences pp)
1087 * Obtain message contained in envelope.
1089 * @param env the envelope
1090 * @return message contained in the envelope
1092 const struct GNUNET_MessageHeader *
1093 GNUNET_MQ_env_get_msg (const struct GNUNET_MQ_Envelope *env)
1100 * Return next envelope in queue.
1102 * @param env a queued envelope
1103 * @return next one, or NULL
1105 const struct GNUNET_MQ_Envelope *
1106 GNUNET_MQ_env_next (const struct GNUNET_MQ_Envelope *env)
1113 * Register function to be called whenever @a mq is being
1116 * @param mq message queue to watch
1117 * @param cb function to call on @a mq destruction
1118 * @param cb_cls closure for @a cb
1119 * @return handle for #GNUNET_MQ_destroy_notify_cancel().
1121 struct GNUNET_MQ_DestroyNotificationHandle *
1122 GNUNET_MQ_destroy_notify (struct GNUNET_MQ_Handle *mq,
1123 GNUNET_SCHEDULER_TaskCallback cb,
1126 struct GNUNET_MQ_DestroyNotificationHandle *dnh;
1128 dnh = GNUNET_new (struct GNUNET_MQ_DestroyNotificationHandle);
1131 dnh->cb_cls = cb_cls;
1132 GNUNET_CONTAINER_DLL_insert (mq->dnh_head, mq->dnh_tail, dnh);
1138 * Cancel registration from #GNUNET_MQ_destroy_notify().
1140 * @param dnh handle for registration to cancel
1143 GNUNET_MQ_destroy_notify_cancel (struct
1144 GNUNET_MQ_DestroyNotificationHandle *dnh)
1146 struct GNUNET_MQ_Handle *mq = dnh->mq;
1148 GNUNET_CONTAINER_DLL_remove (mq->dnh_head, mq->dnh_tail, dnh);
1154 * Insert @a env into the envelope DLL starting at @a env_head
1155 * Note that @a env must not be in any MQ while this function
1156 * is used with DLLs defined outside of the MQ module. This
1157 * is just in case some application needs to also manage a
1158 * FIFO of envelopes independent of MQ itself and wants to
1159 * re-use the pointers internal to @a env. Use with caution.
1161 * @param[in|out] env_head of envelope DLL
1162 * @param[in|out] env_tail tail of envelope DLL
1163 * @param[in|out] env element to insert at the tail
1166 GNUNET_MQ_dll_insert_head (struct GNUNET_MQ_Envelope **env_head,
1167 struct GNUNET_MQ_Envelope **env_tail,
1168 struct GNUNET_MQ_Envelope *env)
1170 GNUNET_CONTAINER_DLL_insert (*env_head, *env_tail, env);
1175 * Insert @a env into the envelope DLL starting at @a env_head
1176 * Note that @a env must not be in any MQ while this function
1177 * is used with DLLs defined outside of the MQ module. This
1178 * is just in case some application needs to also manage a
1179 * FIFO of envelopes independent of MQ itself and wants to
1180 * re-use the pointers internal to @a env. Use with caution.
1182 * @param[in|out] env_head of envelope DLL
1183 * @param[in|out] env_tail tail of envelope DLL
1184 * @param[in|out] env element to insert at the tail
1187 GNUNET_MQ_dll_insert_tail (struct GNUNET_MQ_Envelope **env_head,
1188 struct GNUNET_MQ_Envelope **env_tail,
1189 struct GNUNET_MQ_Envelope *env)
1191 GNUNET_CONTAINER_DLL_insert_tail (*env_head, *env_tail, env);
1196 * Remove @a env from the envelope DLL starting at @a env_head.
1197 * Note that @a env must not be in any MQ while this function
1198 * is used with DLLs defined outside of the MQ module. This
1199 * is just in case some application needs to also manage a
1200 * FIFO of envelopes independent of MQ itself and wants to
1201 * re-use the pointers internal to @a env. Use with caution.
1203 * @param[in|out] env_head of envelope DLL
1204 * @param[in|out] env_tail tail of envelope DLL
1205 * @param[in|out] env element to remove from the DLL
1208 GNUNET_MQ_dll_remove (struct GNUNET_MQ_Envelope **env_head,
1209 struct GNUNET_MQ_Envelope **env_tail,
1210 struct GNUNET_MQ_Envelope *env)
1212 GNUNET_CONTAINER_DLL_remove (*env_head, *env_tail, env);
1217 * Copy an array of handlers.
1219 * Useful if the array has been delared in local memory and needs to be
1220 * persisted for future use.
1222 * @param handlers Array of handlers to be copied. Can be NULL (nothing done).
1223 * @return A newly allocated array of handlers.
1224 * Needs to be freed with #GNUNET_free.
1226 struct GNUNET_MQ_MessageHandler *
1227 GNUNET_MQ_copy_handlers (const struct GNUNET_MQ_MessageHandler *handlers)
1229 struct GNUNET_MQ_MessageHandler *copy;
1232 if (NULL == handlers)
1235 count = GNUNET_MQ_count_handlers (handlers);
1236 copy = GNUNET_new_array (count + 1, struct GNUNET_MQ_MessageHandler);
1237 GNUNET_memcpy (copy,
1239 count * sizeof(struct GNUNET_MQ_MessageHandler));
1245 * Copy an array of handlers, appending AGPL handler.
1247 * Useful if the array has been delared in local memory and needs to be
1248 * persisted for future use.
1250 * @param handlers Array of handlers to be copied. Can be NULL (nothing done).
1251 * @param agpl_handler function to call for AGPL handling
1252 * @param agpl_cls closure for @a agpl_handler
1253 * @return A newly allocated array of handlers.
1254 * Needs to be freed with #GNUNET_free.
1256 struct GNUNET_MQ_MessageHandler *
1257 GNUNET_MQ_copy_handlers2 (const struct GNUNET_MQ_MessageHandler *handlers,
1258 GNUNET_MQ_MessageCallback agpl_handler,
1261 struct GNUNET_MQ_MessageHandler *copy;
1264 if (NULL == handlers)
1266 count = GNUNET_MQ_count_handlers (handlers);
1267 copy = GNUNET_new_array (count + 2, struct GNUNET_MQ_MessageHandler);
1268 GNUNET_memcpy (copy,
1270 count * sizeof(struct GNUNET_MQ_MessageHandler));
1271 copy[count].mv = NULL;
1272 copy[count].cb = agpl_handler;
1273 copy[count].cls = agpl_cls;
1274 copy[count].type = GNUNET_MESSAGE_TYPE_REQUEST_AGPL;
1275 copy[count].expected_size = sizeof(struct GNUNET_MessageHeader);
1281 * Count the handlers in a handler array.
1283 * @param handlers Array of handlers to be counted.
1284 * @return The number of handlers in the array.
1287 GNUNET_MQ_count_handlers (const struct GNUNET_MQ_MessageHandler *handlers)
1291 if (NULL == handlers)
1294 for (i = 0; NULL != handlers[i].cb; i++)
1302 * Convert an `enum GNUNET_MQ_PreferenceType` to a string
1304 * @param type the preference type
1305 * @return a string or NULL if invalid
1308 GNUNET_MQ_preference_to_string (enum GNUNET_MQ_PreferenceKind type)
1312 case GNUNET_MQ_PREFERENCE_NONE:
1315 case GNUNET_MQ_PREFERENCE_BANDWIDTH:
1318 case GNUNET_MQ_PREFERENCE_LATENCY:
1321 case GNUNET_MQ_PREFERENCE_RELIABILITY:
1322 return "RELIABILITY";