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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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22 * @author Florian Dold
24 * @brief general purpose request queue
27 #include "gnunet_util_lib.h"
29 #define LOG(kind,...) GNUNET_log_from (kind, "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.
76 * Additional options buffer set for this envelope by
77 * #GNUNET_MQ_env_set_options(). Only valid if
78 * @e have_custom_options is set.
83 * Did the application call #GNUNET_MQ_env_set_options()?
85 int have_custom_options;
90 * Handle to a message queue.
92 struct GNUNET_MQ_Handle
95 * Handlers array, or NULL if the queue should not receive messages
97 struct GNUNET_MQ_MessageHandler *handlers;
100 * Actual implementation of message sending,
101 * called when a message is added
103 GNUNET_MQ_SendImpl send_impl;
106 * Implementation-dependent queue destruction function
108 GNUNET_MQ_DestroyImpl destroy_impl;
111 * Implementation-dependent send cancel function
113 GNUNET_MQ_CancelImpl cancel_impl;
116 * Implementation-specific state
121 * Callback will be called when an error occurs.
123 GNUNET_MQ_ErrorHandler error_handler;
126 * Closure for the error handler.
128 void *error_handler_cls;
131 * Task to asynchronously run #impl_send_continue().
133 struct GNUNET_SCHEDULER_Task *send_task;
136 * Linked list of messages pending to be sent
138 struct GNUNET_MQ_Envelope *envelope_head;
141 * Linked list of messages pending to be sent
143 struct GNUNET_MQ_Envelope *envelope_tail;
146 * Message that is currently scheduled to be
147 * sent. Not the head of the message queue, as the implementation
148 * needs to know if sending has been already scheduled or not.
150 struct GNUNET_MQ_Envelope *current_envelope;
153 * Map of associations, lazily allocated
155 struct GNUNET_CONTAINER_MultiHashMap32 *assoc_map;
158 * Functions to call on queue destruction; kept in a DLL.
160 struct GNUNET_MQ_DestroyNotificationHandle *dnh_head;
163 * Functions to call on queue destruction; kept in a DLL.
165 struct GNUNET_MQ_DestroyNotificationHandle *dnh_tail;
168 * Additional options buffer set for this queue by
169 * #GNUNET_MQ_set_options(). Default is 0.
171 const void *default_extra;
174 * Flags that were set for this queue by
175 * #GNUNET_MQ_set_options(). Default is 0.
177 uint64_t default_flags;
180 * Next id that should be used for the @e assoc_map,
181 * initialized lazily to a random value together with
187 * Number of entries we have in the envelope-DLL.
189 unsigned int queue_length;
192 * #GNUNET_YES if GNUNET_MQ_impl_evacuate was called.
193 * FIXME: is this dead?
198 * #GNUNET_YES if GNUNET_MQ_impl_send_in_flight() was called.
205 * Implementation-specific state for connection to
206 * client (MQ for server).
208 struct ServerClientSocketState
211 * Handle of the client that connected to the server.
213 struct GNUNET_SERVER_Client *client;
216 * Active transmission request to the client.
218 struct GNUNET_SERVER_TransmitHandle *th;
223 * Call the message message handler that was registered
224 * for the type of the given message in the given message queue.
226 * This function is indended to be used for the implementation
229 * @param mq message queue with the handlers
230 * @param mh message to dispatch
233 GNUNET_MQ_inject_message (struct GNUNET_MQ_Handle *mq,
234 const struct GNUNET_MessageHeader *mh)
236 const struct GNUNET_MQ_MessageHandler *handler;
237 int handled = GNUNET_NO;
238 uint16_t ms = ntohs (mh->size);
240 if (NULL == mq->handlers)
242 for (handler = mq->handlers; NULL != handler->cb; handler++)
244 if (handler->type == ntohs (mh->type))
246 handled = GNUNET_YES;
247 if ( (handler->expected_size > ms) ||
248 ( (handler->expected_size != ms) &&
249 (NULL == handler->mv) ) )
251 /* Too small, or not an exact size and
252 no 'mv' handler to check rest */
253 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
254 "Received malformed message of type %u\n",
255 (unsigned int) handler->type);
256 GNUNET_MQ_inject_error (mq,
257 GNUNET_MQ_ERROR_MALFORMED);
260 if ( (NULL == handler->mv) ||
262 handler->mv (handler->cls, mh)) )
264 /* message well-formed, pass to handler */
265 handler->cb (handler->cls, mh);
269 /* Message rejected by check routine */
270 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
271 "Received malformed message of type %u\n",
272 (unsigned int) handler->type);
273 GNUNET_MQ_inject_error (mq,
274 GNUNET_MQ_ERROR_MALFORMED);
280 if (GNUNET_NO == handled)
281 LOG (GNUNET_ERROR_TYPE_INFO,
282 "No handler for message of type %d and size %d\n",
289 * Call the error handler of a message queue with the given
290 * error code. If there is no error handler, log a warning.
292 * This function is intended to be used by the implementation
295 * @param mq message queue
296 * @param error the error type
299 GNUNET_MQ_inject_error (struct GNUNET_MQ_Handle *mq,
300 enum GNUNET_MQ_Error error)
302 if (NULL == mq->error_handler)
304 LOG (GNUNET_ERROR_TYPE_WARNING,
305 "Got error %d, but no handler installed\n",
309 mq->error_handler (mq->error_handler_cls,
315 * Discard the message queue message, free all
316 * allocated resources. Must be called in the event
317 * that a message is created but should not actually be sent.
319 * @param mqm the message to discard
322 GNUNET_MQ_discard (struct GNUNET_MQ_Envelope *ev)
324 GNUNET_assert (NULL == ev->parent_queue);
330 * Obtain the current length of the message queue.
332 * @param mq queue to inspect
333 * @return number of queued, non-transmitted messages
336 GNUNET_MQ_get_length (struct GNUNET_MQ_Handle *mq)
338 if (GNUNET_YES != mq->in_flight)
340 return mq->queue_length;
342 return mq->queue_length - 1;
347 * Send a message with the given message queue.
348 * May only be called once per message.
350 * @param mq message queue
351 * @param ev the envelope with the message to send.
354 GNUNET_MQ_send (struct GNUNET_MQ_Handle *mq,
355 struct GNUNET_MQ_Envelope *ev)
357 GNUNET_assert (NULL != mq);
358 GNUNET_assert (NULL == ev->parent_queue);
361 ev->parent_queue = mq;
362 /* is the implementation busy? queue it! */
363 if ( (NULL != mq->current_envelope) ||
364 (NULL != mq->send_task) )
366 GNUNET_CONTAINER_DLL_insert_tail (mq->envelope_head,
371 GNUNET_assert (NULL == mq->envelope_head);
372 mq->current_envelope = ev;
380 * Remove the first envelope that has not yet been sent from the message
381 * queue and return it.
383 * @param mq queue to remove envelope from
384 * @return NULL if queue is empty (or has no envelope that is not under transmission)
386 struct GNUNET_MQ_Envelope *
387 GNUNET_MQ_unsent_head (struct GNUNET_MQ_Handle *mq)
389 struct GNUNET_MQ_Envelope *env;
391 env = mq->envelope_head;
392 GNUNET_CONTAINER_DLL_remove (mq->envelope_head,
396 env->parent_queue = NULL;
402 * Function to copy an envelope. The envelope must not yet
403 * be in any queue or have any options or callbacks set.
405 * @param env envelope to copy
406 * @return copy of @a env
408 struct GNUNET_MQ_Envelope *
409 GNUNET_MQ_env_copy (struct GNUNET_MQ_Envelope *env)
411 GNUNET_assert (NULL == env->next);
412 GNUNET_assert (NULL == env->parent_queue);
413 GNUNET_assert (NULL == env->sent_cb);
414 GNUNET_assert (GNUNET_NO == env->have_custom_options);
415 return GNUNET_MQ_msg_copy (env->mh);
420 * Send a copy of a message with the given message queue.
421 * Can be called repeatedly on the same envelope.
423 * @param mq message queue
424 * @param ev the envelope with the message to send.
427 GNUNET_MQ_send_copy (struct GNUNET_MQ_Handle *mq,
428 const struct GNUNET_MQ_Envelope *ev)
430 struct GNUNET_MQ_Envelope *env;
433 msize = ntohs (ev->mh->size);
434 env = GNUNET_malloc (sizeof (struct GNUNET_MQ_Envelope) +
436 env->mh = (struct GNUNET_MessageHeader *) &env[1];
437 env->sent_cb = ev->sent_cb;
438 env->sent_cls = ev->sent_cls;
439 GNUNET_memcpy (&env[1],
448 * Task run to call the send implementation for the next queued
449 * message, if any. Only useful for implementing message queues,
450 * results in undefined behavior if not used carefully.
452 * @param cls message queue to send the next message with
455 impl_send_continue (void *cls)
457 struct GNUNET_MQ_Handle *mq = cls;
459 mq->send_task = NULL;
460 /* call is only valid if we're actually currently sending
462 if (NULL == mq->envelope_head)
464 mq->current_envelope = mq->envelope_head;
465 GNUNET_CONTAINER_DLL_remove (mq->envelope_head,
467 mq->current_envelope);
469 mq->current_envelope->mh,
475 * Call the send implementation for the next queued message, if any.
476 * Only useful for implementing message queues, results in undefined
477 * behavior if not used carefully.
479 * @param mq message queue to send the next message with
482 GNUNET_MQ_impl_send_continue (struct GNUNET_MQ_Handle *mq)
484 struct GNUNET_MQ_Envelope *current_envelope;
485 GNUNET_SCHEDULER_TaskCallback cb;
487 GNUNET_assert (0 < mq->queue_length);
489 mq->in_flight = GNUNET_NO;
490 current_envelope = mq->current_envelope;
491 current_envelope->parent_queue = NULL;
492 mq->current_envelope = NULL;
493 GNUNET_assert (NULL == mq->send_task);
494 mq->send_task = GNUNET_SCHEDULER_add_now (&impl_send_continue,
496 if (NULL != (cb = current_envelope->sent_cb))
498 current_envelope->sent_cb = NULL;
499 cb (current_envelope->sent_cls);
501 GNUNET_free (current_envelope);
506 * Call the send notification for the current message, but do not
507 * try to send the next message until #GNUNET_MQ_impl_send_continue
510 * Only useful for implementing message queues, results in undefined
511 * behavior if not used carefully.
513 * @param mq message queue to send the next message with
516 GNUNET_MQ_impl_send_in_flight (struct GNUNET_MQ_Handle *mq)
518 struct GNUNET_MQ_Envelope *current_envelope;
519 GNUNET_SCHEDULER_TaskCallback cb;
521 mq->in_flight = GNUNET_YES;
522 /* call is only valid if we're actually currently sending
524 current_envelope = mq->current_envelope;
525 GNUNET_assert (NULL != current_envelope);
526 /* can't call cancel from now on anymore */
527 current_envelope->parent_queue = NULL;
528 if (NULL != (cb = current_envelope->sent_cb))
530 current_envelope->sent_cb = NULL;
531 cb (current_envelope->sent_cls);
537 * Create a message queue for the specified handlers.
539 * @param send function the implements sending messages
540 * @param destroy function that implements destroying the queue
541 * @param cancel function that implements canceling a message
542 * @param impl_state for the queue, passed to 'send' and 'destroy'
543 * @param handlers array of message handlers
544 * @param error_handler handler for read and write errors
545 * @param error_handler_cls closure for @a error_handler
546 * @return a new message queue
548 struct GNUNET_MQ_Handle *
549 GNUNET_MQ_queue_for_callbacks (GNUNET_MQ_SendImpl send,
550 GNUNET_MQ_DestroyImpl destroy,
551 GNUNET_MQ_CancelImpl cancel,
553 const struct GNUNET_MQ_MessageHandler *handlers,
554 GNUNET_MQ_ErrorHandler error_handler,
555 void *error_handler_cls)
557 struct GNUNET_MQ_Handle *mq;
559 mq = GNUNET_new (struct GNUNET_MQ_Handle);
560 mq->send_impl = send;
561 mq->destroy_impl = destroy;
562 mq->cancel_impl = cancel;
563 mq->handlers = GNUNET_MQ_copy_handlers (handlers);
564 mq->error_handler = error_handler;
565 mq->error_handler_cls = error_handler_cls;
566 mq->impl_state = impl_state;
573 * Change the closure argument in all of the `handlers` of the
576 * @param mq to modify
577 * @param handlers_cls new closure to use
580 GNUNET_MQ_set_handlers_closure (struct GNUNET_MQ_Handle *mq,
585 if (NULL == mq->handlers)
587 for (i=0;NULL != mq->handlers[i].cb; i++)
588 mq->handlers[i].cls = handlers_cls;
593 * Get the message that should currently be sent.
594 * Fails if there is no current message.
595 * Only useful for implementing message queues,
596 * results in undefined behavior if not used carefully.
598 * @param mq message queue with the current message
599 * @return message to send, never NULL
601 const struct GNUNET_MessageHeader *
602 GNUNET_MQ_impl_current (struct GNUNET_MQ_Handle *mq)
604 GNUNET_assert (NULL != mq->current_envelope);
605 GNUNET_assert (NULL != mq->current_envelope->mh);
606 return mq->current_envelope->mh;
611 * Get the implementation state associated with the
614 * While the GNUNET_MQ_Impl* callbacks receive the
615 * implementation state, continuations that are scheduled
616 * by the implementation function often only have one closure
617 * argument, with this function it is possible to get at the
618 * implementation state when only passing the GNUNET_MQ_Handle
621 * @param mq message queue with the current message
622 * @return message to send, never NULL
625 GNUNET_MQ_impl_state (struct GNUNET_MQ_Handle *mq)
627 return mq->impl_state;
631 struct GNUNET_MQ_Envelope *
632 GNUNET_MQ_msg_ (struct GNUNET_MessageHeader **mhp,
636 struct GNUNET_MQ_Envelope *ev;
638 ev = GNUNET_malloc (size + sizeof (struct GNUNET_MQ_Envelope));
639 ev->mh = (struct GNUNET_MessageHeader *) &ev[1];
640 ev->mh->size = htons (size);
641 ev->mh->type = htons (type);
649 * Create a new envelope by copying an existing message.
651 * @param hdr header of the message to copy
652 * @return envelope containing @a hdr
654 struct GNUNET_MQ_Envelope *
655 GNUNET_MQ_msg_copy (const struct GNUNET_MessageHeader *hdr)
657 struct GNUNET_MQ_Envelope *mqm;
658 uint16_t size = ntohs (hdr->size);
660 mqm = GNUNET_malloc (sizeof (*mqm) + size);
661 mqm->mh = (struct GNUNET_MessageHeader *) &mqm[1];
662 GNUNET_memcpy (mqm->mh,
670 * Implementation of the #GNUNET_MQ_msg_nested_mh macro.
672 * @param mhp pointer to the message header pointer that will be changed to allocate at
673 * the newly allocated space for the message.
674 * @param base_size size of the data before the nested message
675 * @param type type of the message in the envelope
676 * @param nested_mh the message to append to the message after base_size
678 struct GNUNET_MQ_Envelope *
679 GNUNET_MQ_msg_nested_mh_ (struct GNUNET_MessageHeader **mhp,
682 const struct GNUNET_MessageHeader *nested_mh)
684 struct GNUNET_MQ_Envelope *mqm;
687 if (NULL == nested_mh)
688 return GNUNET_MQ_msg_ (mhp, base_size, type);
690 size = base_size + ntohs (nested_mh->size);
692 /* check for uint16_t overflow */
693 if (size < base_size)
696 mqm = GNUNET_MQ_msg_ (mhp, size, type);
697 GNUNET_memcpy ((char *) mqm->mh + base_size,
699 ntohs (nested_mh->size));
706 * Transmit a queued message to the session's client.
708 * @param cls consensus session
709 * @param size number of bytes available in @a buf
710 * @param buf where the callee should write the message
711 * @return number of bytes written to @a buf
714 transmit_queued (void *cls,
718 struct GNUNET_MQ_Handle *mq = cls;
719 struct ServerClientSocketState *state = GNUNET_MQ_impl_state (mq);
720 const struct GNUNET_MessageHeader *msg = GNUNET_MQ_impl_current (mq);
723 GNUNET_assert (NULL != buf);
724 msg_size = ntohs (msg->size);
725 GNUNET_assert (size >= msg_size);
726 GNUNET_memcpy (buf, msg, msg_size);
729 GNUNET_MQ_impl_send_continue (mq);
736 server_client_destroy_impl (struct GNUNET_MQ_Handle *mq,
739 struct ServerClientSocketState *state = impl_state;
741 if (NULL != state->th)
743 GNUNET_SERVER_notify_transmit_ready_cancel (state->th);
747 GNUNET_assert (NULL != mq);
748 GNUNET_assert (NULL != state);
749 GNUNET_SERVER_client_drop (state->client);
755 server_client_send_impl (struct GNUNET_MQ_Handle *mq,
756 const struct GNUNET_MessageHeader *msg,
759 struct ServerClientSocketState *state = impl_state;
761 GNUNET_assert (NULL != mq);
762 state->th = GNUNET_SERVER_notify_transmit_ready (state->client,
764 GNUNET_TIME_UNIT_FOREVER_REL,
770 struct GNUNET_MQ_Handle *
771 GNUNET_MQ_queue_for_server_client (struct GNUNET_SERVER_Client *client)
773 struct GNUNET_MQ_Handle *mq;
774 struct ServerClientSocketState *scss;
776 mq = GNUNET_new (struct GNUNET_MQ_Handle);
777 scss = GNUNET_new (struct ServerClientSocketState);
778 mq->impl_state = scss;
779 scss->client = client;
780 GNUNET_SERVER_client_keep (client);
781 mq->send_impl = &server_client_send_impl;
782 mq->destroy_impl = &server_client_destroy_impl;
788 * Associate the assoc_data in mq with a unique request id.
790 * @param mq message queue, id will be unique for the queue
791 * @param assoc_data to associate
794 GNUNET_MQ_assoc_add (struct GNUNET_MQ_Handle *mq,
799 if (NULL == mq->assoc_map)
801 mq->assoc_map = GNUNET_CONTAINER_multihashmap32_create (8);
805 GNUNET_CONTAINER_multihashmap32_put (mq->assoc_map, id, assoc_data,
806 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
812 GNUNET_MQ_assoc_get (struct GNUNET_MQ_Handle *mq,
815 if (NULL == mq->assoc_map)
817 return GNUNET_CONTAINER_multihashmap32_get (mq->assoc_map, request_id);
822 GNUNET_MQ_assoc_remove (struct GNUNET_MQ_Handle *mq,
827 if (NULL == mq->assoc_map)
829 val = GNUNET_CONTAINER_multihashmap32_get (mq->assoc_map,
831 GNUNET_CONTAINER_multihashmap32_remove_all (mq->assoc_map,
838 * Call a callback once the envelope has been sent, that is,
839 * sending it can not be canceled anymore.
840 * There can be only one notify sent callback per envelope.
842 * @param ev message to call the notify callback for
843 * @param cb the notify callback
844 * @param cb_cls closure for the callback
847 GNUNET_MQ_notify_sent (struct GNUNET_MQ_Envelope *ev,
848 GNUNET_SCHEDULER_TaskCallback cb,
851 GNUNET_assert (NULL == ev->sent_cb);
853 ev->sent_cls = cb_cls;
858 * Handle we return for callbacks registered to be
859 * notified when #GNUNET_MQ_destroy() is called on a queue.
861 struct GNUNET_MQ_DestroyNotificationHandle
866 struct GNUNET_MQ_DestroyNotificationHandle *prev;
871 struct GNUNET_MQ_DestroyNotificationHandle *next;
874 * Queue to notify about.
876 struct GNUNET_MQ_Handle *mq;
881 GNUNET_SCHEDULER_TaskCallback cb;
891 * Destroy the message queue.
893 * @param mq message queue to destroy
896 GNUNET_MQ_destroy (struct GNUNET_MQ_Handle *mq)
898 struct GNUNET_MQ_DestroyNotificationHandle *dnh;
900 if (NULL != mq->destroy_impl)
902 mq->destroy_impl (mq, mq->impl_state);
904 if (NULL != mq->send_task)
906 GNUNET_SCHEDULER_cancel (mq->send_task);
907 mq->send_task = NULL;
909 while (NULL != mq->envelope_head)
911 struct GNUNET_MQ_Envelope *ev;
913 ev = mq->envelope_head;
914 ev->parent_queue = NULL;
915 GNUNET_CONTAINER_DLL_remove (mq->envelope_head,
918 GNUNET_assert (0 < mq->queue_length);
920 GNUNET_MQ_discard (ev);
922 if (NULL != mq->current_envelope)
924 /* we can only discard envelopes that
926 mq->current_envelope->parent_queue = NULL;
927 GNUNET_MQ_discard (mq->current_envelope);
928 mq->current_envelope = NULL;
929 GNUNET_assert (0 < mq->queue_length);
932 GNUNET_assert (0 == mq->queue_length);
933 while (NULL != (dnh = mq->dnh_head))
935 dnh->cb (dnh->cb_cls);
936 GNUNET_MQ_destroy_notify_cancel (dnh);
938 if (NULL != mq->assoc_map)
940 GNUNET_CONTAINER_multihashmap32_destroy (mq->assoc_map);
941 mq->assoc_map = NULL;
943 GNUNET_free_non_null (mq->handlers);
948 const struct GNUNET_MessageHeader *
949 GNUNET_MQ_extract_nested_mh_ (const struct GNUNET_MessageHeader *mh,
953 uint16_t nested_size;
954 const struct GNUNET_MessageHeader *nested_msg;
956 whole_size = ntohs (mh->size);
957 GNUNET_assert (whole_size >= base_size);
958 nested_size = whole_size - base_size;
959 if (0 == nested_size)
961 if (nested_size < sizeof (struct GNUNET_MessageHeader))
966 nested_msg = (const struct GNUNET_MessageHeader *) ((char *) mh + base_size);
967 if (ntohs (nested_msg->size) != nested_size)
977 * Cancel sending the message. Message must have been sent with
978 * #GNUNET_MQ_send before. May not be called after the notify sent
979 * callback has been called
981 * @param ev queued envelope to cancel
984 GNUNET_MQ_send_cancel (struct GNUNET_MQ_Envelope *ev)
986 struct GNUNET_MQ_Handle *mq = ev->parent_queue;
988 GNUNET_assert (NULL != mq);
989 GNUNET_assert (NULL != mq->cancel_impl);
991 mq->evacuate_called = GNUNET_NO;
993 if (mq->current_envelope == ev)
995 /* complex case, we already started with transmitting
996 the message using the callbacks. */
997 GNUNET_assert (0 < mq->queue_length);
1001 /* continue sending the next message, if any */
1002 mq->current_envelope = mq->envelope_head;
1003 if (NULL != mq->current_envelope)
1005 GNUNET_CONTAINER_DLL_remove (mq->envelope_head,
1007 mq->current_envelope);
1009 mq->current_envelope->mh,
1015 /* simple case, message is still waiting in the queue */
1016 GNUNET_CONTAINER_DLL_remove (mq->envelope_head,
1019 GNUNET_assert (0 < mq->queue_length);
1023 if (GNUNET_YES != mq->evacuate_called)
1025 ev->parent_queue = NULL;
1034 * Function to obtain the current envelope
1035 * from within #GNUNET_MQ_SendImpl implementations.
1037 * @param mq message queue to interrogate
1038 * @return the current envelope
1040 struct GNUNET_MQ_Envelope *
1041 GNUNET_MQ_get_current_envelope (struct GNUNET_MQ_Handle *mq)
1043 return mq->current_envelope;
1048 * Function to obtain the last envelope in the queue.
1050 * @param mq message queue to interrogate
1051 * @return the last envelope in the queue
1053 struct GNUNET_MQ_Envelope *
1054 GNUNET_MQ_get_last_envelope (struct GNUNET_MQ_Handle *mq)
1056 if (NULL != mq->envelope_tail)
1057 return mq->envelope_tail;
1059 return mq->current_envelope;
1064 * Set application-specific options for this envelope.
1065 * Overrides the options set for the queue with
1066 * #GNUNET_MQ_set_options() for this message only.
1068 * @param env message to set options for
1069 * @param flags flags to use (meaning is queue-specific)
1070 * @param extra additional buffer for further data (also queue-specific)
1073 GNUNET_MQ_env_set_options (struct GNUNET_MQ_Envelope *env,
1079 env->have_custom_options = GNUNET_YES;
1084 * Get application-specific options for this envelope.
1086 * @param env message to set options for
1087 * @param[out] flags set to flags to use (meaning is queue-specific)
1088 * @return extra additional buffer for further data (also queue-specific)
1091 GNUNET_MQ_env_get_options (struct GNUNET_MQ_Envelope *env,
1094 struct GNUNET_MQ_Handle *mq = env->parent_queue;
1096 if (GNUNET_YES == env->have_custom_options)
1098 *flags = env->flags;
1106 *flags = mq->default_flags;
1107 return mq->default_extra;
1112 * Set application-specific options for this queue.
1114 * @param mq message queue to set options for
1115 * @param flags flags to use (meaning is queue-specific)
1116 * @param extra additional buffer for further data (also queue-specific)
1119 GNUNET_MQ_set_options (struct GNUNET_MQ_Handle *mq,
1123 mq->default_flags = flags;
1124 mq->default_extra = extra;
1129 * Register function to be called whenever @a mq is being
1132 * @param mq message queue to watch
1133 * @param cb function to call on @a mq destruction
1134 * @param cb_cls closure for @a cb
1135 * @return handle for #GNUNET_MQ_destroy_notify_cancel().
1137 struct GNUNET_MQ_DestroyNotificationHandle *
1138 GNUNET_MQ_destroy_notify (struct GNUNET_MQ_Handle *mq,
1139 GNUNET_SCHEDULER_TaskCallback cb,
1142 struct GNUNET_MQ_DestroyNotificationHandle *dnh;
1144 dnh = GNUNET_new (struct GNUNET_MQ_DestroyNotificationHandle);
1147 dnh->cb_cls = cb_cls;
1148 GNUNET_CONTAINER_DLL_insert (mq->dnh_head,
1156 * Cancel registration from #GNUNET_MQ_destroy_notify().
1158 * @param dnh handle for registration to cancel
1161 GNUNET_MQ_destroy_notify_cancel (struct GNUNET_MQ_DestroyNotificationHandle *dnh)
1163 struct GNUNET_MQ_Handle *mq = dnh->mq;
1165 GNUNET_CONTAINER_DLL_remove (mq->dnh_head,
1173 * Insert @a env into the envelope DLL starting at @a env_head
1174 * Note that @a env must not be in any MQ while this function
1175 * is used with DLLs defined outside of the MQ module. This
1176 * is just in case some application needs to also manage a
1177 * FIFO of envelopes independent of MQ itself and wants to
1178 * re-use the pointers internal to @a env. Use with caution.
1180 * @param[in|out] env_head of envelope DLL
1181 * @param[in|out] env_tail tail of envelope DLL
1182 * @param[in|out] env element to insert at the tail
1185 GNUNET_MQ_dll_insert_tail (struct GNUNET_MQ_Envelope **env_head,
1186 struct GNUNET_MQ_Envelope **env_tail,
1187 struct GNUNET_MQ_Envelope *env)
1189 GNUNET_CONTAINER_DLL_insert_tail (*env_head,
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,
1219 * Copy an array of handlers.
1221 * Useful if the array has been delared in local memory and needs to be
1222 * persisted for future use.
1224 * @param handlers Array of handlers to be copied. Can be NULL (nothing done).
1225 * @return A newly allocated array of handlers.
1226 * Needs to be freed with #GNUNET_free.
1228 struct GNUNET_MQ_MessageHandler *
1229 GNUNET_MQ_copy_handlers (const struct GNUNET_MQ_MessageHandler *handlers)
1231 struct GNUNET_MQ_MessageHandler *copy;
1234 if (NULL == handlers)
1237 count = GNUNET_MQ_count_handlers (handlers);
1238 copy = GNUNET_new_array (count + 1,
1239 struct GNUNET_MQ_MessageHandler);
1240 GNUNET_memcpy (copy,
1242 count * sizeof (struct GNUNET_MQ_MessageHandler));
1248 * Count the handlers in a handler array.
1250 * @param handlers Array of handlers to be counted.
1251 * @return The number of handlers in the array.
1254 GNUNET_MQ_count_handlers (const struct GNUNET_MQ_MessageHandler *handlers)
1258 if (NULL == handlers)
1261 for (i=0; NULL != handlers[i].cb; i++) ;