messenger_api_queue_messages.c

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/*
   This file is part of GNUnet.
   Copyright (C) 2023--2024 GNUnet e.V.
 
   GNUnet is free software: you can redistribute it and/or modify it
   under the terms of the GNU Affero General Public License as published
   by the Free Software Foundation, either version 3 of the License,
   or (at your option) any later version.
 
   GNUnet is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Affero General Public License for more details.
 
   You should have received a copy of the GNU Affero General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
   SPDX-License-Identifier: AGPL3.0-or-later
 */
#include "messenger_api_queue_messages.h"
 
#include "gnunet_messenger_service.h"
#include "messenger_api_message.h"
 
void
init_queue_messages (struct GNUNET_MESSENGER_QueueMessages *messages)
{
  GNUNET_assert (messages);
 
  messages->head = NULL;
  messages->tail = NULL;
}
 
 
void
clear_queue_messages (struct GNUNET_MESSENGER_QueueMessages *messages)
{
  GNUNET_assert (messages);
 
  while (messages->head)
  {
    struct GNUNET_MESSENGER_QueueMessage *element = messages->head;
 
    GNUNET_CONTAINER_DLL_remove (messages->head, messages->tail, element);
 
    if (element->message)
      destroy_message (element->message);
 
    if (element->transcript)
      destroy_message (element->transcript);
 
    GNUNET_free (element);
  }
 
  messages->head = NULL;
  messages->tail = NULL;
}
 
 
void
enqueue_to_messages (struct GNUNET_MESSENGER_QueueMessages *messages,
                     const struct GNUNET_CRYPTO_PrivateKey *sender,
                     struct GNUNET_MESSENGER_Message *message,
                     struct GNUNET_MESSENGER_Message *transcript)
{
  GNUNET_assert ((messages) && (sender) && (message));
 
  struct GNUNET_MESSENGER_QueueMessage *element = GNUNET_new (struct
                                                              GNUNET_MESSENGER_QueueMessage);
 
  if (! element)
    return;
 
  const enum GNUNET_MESSENGER_MessageKind kind = message->header.kind;
 
  element->message = message;
  element->transcript = transcript;
 
  GNUNET_memcpy (&(element->sender), sender, sizeof (element->sender));
 
  if (! element->message)
  {
    if (element->transcript)
      destroy_message (element->transcript);
 
    GNUNET_free (element);
    return;
  }
 
  if (GNUNET_MESSENGER_KIND_JOIN == kind)
    GNUNET_CONTAINER_DLL_insert (messages->head, messages->tail, element);
  else if (GNUNET_MESSENGER_KIND_SUBSCRIBE == kind)
  {
    struct GNUNET_MESSENGER_QueueMessage *other = messages->head;
    
    while (other)
    {
      if (GNUNET_MESSENGER_KIND_TALK == other->message->header.kind)
        break;
 
      other = other->next;
    }
 
    GNUNET_CONTAINER_DLL_insert_before (messages->head, messages->tail, other, element);
  }
  else
    GNUNET_CONTAINER_DLL_insert_tail (messages->head, messages->tail, element);
}
 
 
struct GNUNET_MESSENGER_Message*
dequeue_from_messages (struct GNUNET_MESSENGER_QueueMessages *messages,
                       struct GNUNET_CRYPTO_PrivateKey *sender,
                       struct GNUNET_MESSENGER_Message **transcript)
{
  GNUNET_assert (messages);
 
  struct GNUNET_MESSENGER_QueueMessage *element = messages->head;
 
  if (! element)
  {
    if (transcript)
      *transcript = NULL;
 
    return NULL;
  }
 
  struct GNUNET_MESSENGER_Message *message = element->message;
 
  if (transcript)
    *transcript = element->transcript;
  else if (element->transcript)
    destroy_message (element->transcript);
 
  GNUNET_CONTAINER_DLL_remove (messages->head, messages->tail, element);
 
  if (sender)
    GNUNET_memcpy (sender, &(element->sender), sizeof (*sender));
 
  GNUNET_free (element);
  return message;
}