239 lines
9.2 KiB
C
239 lines
9.2 KiB
C
/*
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* Copyright (c) 2017, RISE SICS AB.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup lwm2m
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* @{
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*/
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/**
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* \file
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* Implementation of functions to manage the queue of notifications
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* \author
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* Carlos Gonzalo Peces <carlosgp143@gmail.com>
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*/
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/*---------------------------------------------------------------------------*/
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#include "lwm2m-notification-queue.h"
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#if LWM2M_QUEUE_MODE_ENABLED
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#include "lwm2m-queue-mode.h"
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#include "lwm2m-engine.h"
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#include "coap-engine.h"
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#include "lib/memb.h"
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#include "lib/list.h"
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#include <string.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <stdio.h>
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/* Log configuration */
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#include "coap-log.h"
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#define LOG_MODULE "lwm2m-notification-queue"
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#define LOG_LEVEL LOG_LEVEL_LWM2M
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#ifdef LWM2M_NOTIFICATION_QUEUE_CONF_LENGTH
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#define LWM2M_NOTIFICATION_QUEUE_LENGTH LWM2M_NOTIFICATION_QUEUE_CONF_LENGTH
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#else
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#define LWM2M_NOTIFICATION_QUEUE_LENGTH 3
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#endif
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/*---------------------------------------------------------------------------*/
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/* 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 + 1); /* Length + 1 to allocate the new path to add */
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LIST(notification_paths_queue);
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/*---------------------------------------------------------------------------*/
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void
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lwm2m_notification_queue_init(void)
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{
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list_init(notification_paths_queue);
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}
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/*---------------------------------------------------------------------------*/
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static void
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reduce_path(notification_path_t *path_object, char *path)
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{
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char *cut = strtok(path, "/");
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int i;
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for(i = 0; i < 3; i++) {
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if(cut != NULL) {
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path_object->reduced_path[i] = (uint16_t)atoi(cut);
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cut = strtok(NULL, "/");
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} else {
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break;
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}
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}
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path_object->level = i;
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}
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/*---------------------------------------------------------------------------*/
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static void
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extend_path(notification_path_t *path_object, char *path, int path_size)
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{
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switch(path_object->level) {
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case 1:
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snprintf(path, path_size, "%u", path_object->reduced_path[0]);
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break;
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case 2:
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snprintf(path, path_size, "%u/%u", path_object->reduced_path[0], path_object->reduced_path[1]);
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break;
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case 3:
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snprintf(path, path_size, "%u/%u/%u", path_object->reduced_path[0], path_object->reduced_path[1], path_object->reduced_path[2]);
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break;
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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add_notification_path_object_ordered(notification_path_t *path)
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{
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notification_path_t *iteration_path = (notification_path_t *)list_head(notification_paths_queue);
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if(list_length(notification_paths_queue) == 0) {
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list_add(notification_paths_queue, path);
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} else if(path->level < iteration_path->level) {
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list_push(notification_paths_queue, path);
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} else if(memcmp((path->reduced_path), (iteration_path->reduced_path), (path->level) * sizeof(uint16_t)) <= 0) {
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list_push(notification_paths_queue, path);
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} else {
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notification_path_t *previous_path = iteration_path;
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while(iteration_path != NULL) {
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if(path->level < iteration_path->level) {
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path->next = iteration_path;
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previous_path->next = path;
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return;
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}
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if(memcmp((path->reduced_path), (iteration_path->reduced_path), (path->level) * sizeof(uint16_t)) <= 0) {
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path->next = iteration_path;
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previous_path->next = path;
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return;
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}
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previous_path = iteration_path;
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iteration_path = iteration_path->next;
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}
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list_add(notification_paths_queue, path);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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remove_notification_path(notification_path_t *path)
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{
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list_remove(notification_paths_queue, path);
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memb_free(¬ification_memb, path);
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}
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/*---------------------------------------------------------------------------*/
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static void
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notification_queue_remove_policy(uint16_t *reduced_path, uint8_t level)
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{
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uint8_t path_removed_flag = 0;
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notification_path_t *path_object = NULL;
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notification_path_t *iteration_path = NULL;
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notification_path_t *previous = NULL;
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notification_path_t *next_next = NULL;
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notification_path_t *path_to_remove = NULL;
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for(iteration_path = (notification_path_t *)list_head(notification_paths_queue); iteration_path != NULL;
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iteration_path = iteration_path->next) {
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/* 1. check if there is one event of the same path -> remove it and add the new one */
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if((level == iteration_path->level) && memcmp(iteration_path->reduced_path, reduced_path, level * sizeof(uint16_t)) == 0) {
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remove_notification_path(iteration_path);
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path_object = memb_alloc(¬ification_memb);
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memcpy(path_object->reduced_path, reduced_path, level * sizeof(uint16_t));
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path_object->level = level;
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add_notification_path_object_ordered(path_object);
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return;
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}
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/* 2. If there is no event of the same type, look for repeated events of the same resource and remove the oldest one */
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if(iteration_path->next != NULL && (iteration_path->level == iteration_path->next->level)
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&& (memcmp(iteration_path->reduced_path, (iteration_path->next)->reduced_path, iteration_path->level * sizeof(uint16_t)) == 0)) {
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path_removed_flag = 1;
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next_next = iteration_path->next->next;
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path_to_remove = iteration_path->next;
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previous = iteration_path;
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}
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}
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/* 3. If there are no events for the same path, we remove a the oldest repeated event of another resource */
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if(path_removed_flag) {
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memb_free(¬ification_memb, path_to_remove);
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previous->next = next_next;
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path_object = memb_alloc(¬ification_memb);
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memcpy(path_object->reduced_path, reduced_path, level * sizeof(uint16_t));
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path_object->level = level;
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add_notification_path_object_ordered(path_object);
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} else {
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/* 4. If all the events are from different resources, remove the last one */
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list_chop(notification_paths_queue);
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path_object = memb_alloc(¬ification_memb);
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memcpy(path_object->reduced_path, reduced_path, level * sizeof(uint16_t));
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path_object->level = level;
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add_notification_path_object_ordered(path_object);
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}
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return;
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}
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/*---------------------------------------------------------------------------*/
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/* For adding objects to the list in an ordered way, depending on the path*/
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void
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lwm2m_notification_queue_add_notification_path(char *path)
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{
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notification_path_t *path_object = memb_alloc(¬ification_memb);
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if(path_object == NULL) {
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LOG_DBG("Could not allocate new notification in the queue\n");
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return;
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}
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reduce_path(path_object, path);
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if(list_length(notification_paths_queue) >= LWM2M_NOTIFICATION_QUEUE_LENGTH) {
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/* The queue is full, apply policy to remove */
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notification_queue_remove_policy(path_object->reduced_path, path_object->level);
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} else {
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add_notification_path_object_ordered(path_object);
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}
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LOG_DBG("Notification path added to the list: %s\n", path);
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}
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/*---------------------------------------------------------------------------*/
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void
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lwm2m_notification_queue_send_notifications()
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{
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char path[20];
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notification_path_t *iteration_path = (notification_path_t *)list_head(notification_paths_queue);
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notification_path_t *aux = iteration_path;
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while(iteration_path != NULL) {
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extend_path(iteration_path, path, sizeof(path));
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#if LWM2M_QUEUE_MODE_INCLUDE_DYNAMIC_ADAPTATION
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if(lwm2m_queue_mode_get_dynamic_adaptation_flag()) {
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lwm2m_engine_set_handler_from_notification();
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}
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#endif
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LOG_DBG("Sending stored notification with path: %s\n", path);
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coap_notify_observers_sub(NULL, path);
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aux = iteration_path;
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iteration_path = iteration_path->next;
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remove_notification_path(aux);
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}
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}
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#endif /* LWM2M_QUEUE_MODE_ENABLED */
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/** @} */ |