nes-proj/os/services/lwm2m/lwm2m-notification-queue.c

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/*
* Copyright (c) 2017, RISE SICS AB.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \addtogroup lwm2m
* @{
*/
/**
* \file
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* Implementation of functions to manage the queue to store notifications
when waiting for the response to the update message in Queue Mode.
* \author
* Carlos Gonzalo Peces <carlosgp143@gmail.com>
*/
/*---------------------------------------------------------------------------*/
#include "lwm2m-notification-queue.h"
#if LWM2M_QUEUE_MODE_ENABLED
#include "lwm2m-queue-mode.h"
#include "lwm2m-engine.h"
#include "coap-engine.h"
#include "lib/memb.h"
#include "lib/list.h"
#include <string.h>
#include <inttypes.h>
#include <stdlib.h>
#include <stdio.h>
/* Log configuration */
#include "coap-log.h"
#define LOG_MODULE "lwm2m-notification-queue"
#define LOG_LEVEL LOG_LEVEL_LWM2M
#ifdef LWM2M_NOTIFICATION_QUEUE_CONF_LENGTH
#define LWM2M_NOTIFICATION_QUEUE_LENGTH LWM2M_NOTIFICATION_QUEUE_CONF_LENGTH
#else
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#define LWM2M_NOTIFICATION_QUEUE_LENGTH COAP_MAX_OBSERVERS
#endif
/*---------------------------------------------------------------------------*/
/* Queue to store the notifications in the period when the client has woken up, sent the update and it's waiting for the server response*/
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MEMB(notification_memb, notification_path_t, LWM2M_NOTIFICATION_QUEUE_LENGTH); /* Length + 1 to allocate the new path to add */
LIST(notification_paths_queue);
/*---------------------------------------------------------------------------*/
void
lwm2m_notification_queue_init(void)
{
list_init(notification_paths_queue);
}
/*---------------------------------------------------------------------------*/
static void
extend_path(notification_path_t *path_object, char *path, int path_size)
{
switch(path_object->level) {
case 1:
snprintf(path, path_size, "%u", path_object->reduced_path[0]);
break;
case 2:
snprintf(path, path_size, "%u/%u", path_object->reduced_path[0], path_object->reduced_path[1]);
break;
case 3:
snprintf(path, path_size, "%u/%u/%u", path_object->reduced_path[0], path_object->reduced_path[1], path_object->reduced_path[2]);
break;
}
}
/*---------------------------------------------------------------------------*/
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static int
is_notification_path_present(uint16_t object_id, uint16_t instance_id, uint16_t resource_id)
{
notification_path_t *iteration_path = (notification_path_t *)list_head(notification_paths_queue);
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while(iteration_path != NULL) {
if(iteration_path->reduced_path[0] == object_id && iteration_path->reduced_path[1] == instance_id
&& iteration_path->reduced_path[2] == resource_id) {
return 1;
}
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iteration_path = iteration_path->next;
}
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return 0;
}
/*---------------------------------------------------------------------------*/
static void
remove_notification_path(notification_path_t *path)
{
list_remove(notification_paths_queue, path);
memb_free(&notification_memb, path);
}
/*---------------------------------------------------------------------------*/
void
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lwm2m_notification_queue_add_notification_path(uint16_t object_id, uint16_t instance_id, uint16_t resource_id)
{
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if(is_notification_path_present(object_id, instance_id, resource_id)) {
LOG_DBG("Notification path already present, not queueing it\n");
return;
}
notification_path_t *path_object = memb_alloc(&notification_memb);
if(path_object == NULL) {
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LOG_DBG("Queue is full, could not allocate new notification\n");
return;
}
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path_object->reduced_path[0] = object_id;
path_object->reduced_path[1] = instance_id;
path_object->reduced_path[2] = resource_id;
path_object->level = 3;
list_add(notification_paths_queue, path_object);
LOG_DBG("Notification path added to the list: %u/%u/%u\n", object_id, instance_id, resource_id);
}
/*---------------------------------------------------------------------------*/
void
lwm2m_notification_queue_send_notifications()
{
char path[20];
notification_path_t *iteration_path = (notification_path_t *)list_head(notification_paths_queue);
notification_path_t *aux = iteration_path;
while(iteration_path != NULL) {
extend_path(iteration_path, path, sizeof(path));
#if LWM2M_QUEUE_MODE_INCLUDE_DYNAMIC_ADAPTATION
if(lwm2m_queue_mode_get_dynamic_adaptation_flag()) {
lwm2m_engine_set_handler_from_notification();
}
#endif
LOG_DBG("Sending stored notification with path: %s\n", path);
coap_notify_observers_sub(NULL, path);
aux = iteration_path;
iteration_path = iteration_path->next;
remove_notification_path(aux);
}
}
#endif /* LWM2M_QUEUE_MODE_ENABLED */
/** @} */