mirror of
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186 lines
6.6 KiB
C
186 lines
6.6 KiB
C
/*
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* Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
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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 Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*/
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/**
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* \file
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* CoAP module for reliable transport
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* \author
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* Matthias Kovatsch <kovatsch@inf.ethz.ch>
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*/
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#include "contiki.h"
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#include "contiki-net.h"
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#include "er-coap-transactions.h"
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#include "er-coap-observe.h"
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#define PRINT6ADDR(addr) PRINTF("[%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x]", ((uint8_t *)addr)[0], ((uint8_t *)addr)[1], ((uint8_t *)addr)[2], ((uint8_t *)addr)[3], ((uint8_t *)addr)[4], ((uint8_t *)addr)[5], ((uint8_t *)addr)[6], ((uint8_t *)addr)[7], ((uint8_t *)addr)[8], ((uint8_t *)addr)[9], ((uint8_t *)addr)[10], ((uint8_t *)addr)[11], ((uint8_t *)addr)[12], ((uint8_t *)addr)[13], ((uint8_t *)addr)[14], ((uint8_t *)addr)[15])
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#define PRINTLLADDR(lladdr) PRINTF("[%02x:%02x:%02x:%02x:%02x:%02x]", (lladdr)->addr[0], (lladdr)->addr[1], (lladdr)->addr[2], (lladdr)->addr[3], (lladdr)->addr[4], (lladdr)->addr[5])
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#else
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#define PRINTF(...)
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#define PRINT6ADDR(addr)
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#define PRINTLLADDR(addr)
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#endif
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/*---------------------------------------------------------------------------*/
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MEMB(transactions_memb, coap_transaction_t, COAP_MAX_OPEN_TRANSACTIONS);
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LIST(transactions_list);
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static struct process *transaction_handler_process = NULL;
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/*---------------------------------------------------------------------------*/
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/*- Internal API ------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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void
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coap_register_as_transaction_handler()
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{
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transaction_handler_process = PROCESS_CURRENT();
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}
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coap_transaction_t *
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coap_new_transaction(uint16_t mid, uip_ipaddr_t *addr, uint16_t port)
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{
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coap_transaction_t *t = memb_alloc(&transactions_memb);
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if(t) {
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t->mid = mid;
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t->retrans_counter = 0;
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/* save client address */
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uip_ipaddr_copy(&t->addr, addr);
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t->port = port;
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list_add(transactions_list, t); /* list itself makes sure same element is not added twice */
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}
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return t;
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}
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/*---------------------------------------------------------------------------*/
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void
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coap_send_transaction(coap_transaction_t *t)
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{
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PRINTF("Sending transaction %u\n", t->mid);
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coap_send_message(&t->addr, t->port, t->packet, t->packet_len);
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if(COAP_TYPE_CON ==
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((COAP_HEADER_TYPE_MASK & t->packet[0]) >> COAP_HEADER_TYPE_POSITION)) {
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if(t->retrans_counter < COAP_MAX_RETRANSMIT) {
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/* not timed out yet */
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PRINTF("Keeping transaction %u\n", t->mid);
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if(t->retrans_counter == 0) {
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t->retrans_timer.timer.interval =
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COAP_RESPONSE_TIMEOUT_TICKS + (random_rand()
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%
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(clock_time_t)
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COAP_RESPONSE_TIMEOUT_BACKOFF_MASK);
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PRINTF("Initial interval %f\n",
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(float)t->retrans_timer.timer.interval / CLOCK_SECOND);
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} else {
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t->retrans_timer.timer.interval <<= 1; /* double */
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PRINTF("Doubled (%u) interval %f\n", t->retrans_counter,
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(float)t->retrans_timer.timer.interval / CLOCK_SECOND);
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}
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/*FIXME
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* Hack: Setting timer for responsible process.
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* Maybe there is a better way, but avoid posting everything to the process.
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*/
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struct process *process_actual = PROCESS_CURRENT();
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process_current = transaction_handler_process;
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etimer_restart(&t->retrans_timer); /* interval updated above */
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process_current = process_actual;
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t = NULL;
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} else {
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/* timed out */
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PRINTF("Timeout\n");
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restful_response_handler callback = t->callback;
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void *callback_data = t->callback_data;
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/* handle observers */
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coap_remove_observer_by_client(&t->addr, t->port);
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coap_clear_transaction(t);
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if(callback) {
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callback(callback_data, NULL);
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}
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}
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} else {
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coap_clear_transaction(t);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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coap_clear_transaction(coap_transaction_t *t)
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{
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if(t) {
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PRINTF("Freeing transaction %u: %p\n", t->mid, t);
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etimer_stop(&t->retrans_timer);
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list_remove(transactions_list, t);
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memb_free(&transactions_memb, t);
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}
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}
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coap_transaction_t *
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coap_get_transaction_by_mid(uint16_t mid)
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{
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coap_transaction_t *t = NULL;
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for(t = (coap_transaction_t *)list_head(transactions_list); t; t = t->next) {
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if(t->mid == mid) {
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PRINTF("Found transaction for MID %u: %p\n", t->mid, t);
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return t;
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}
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}
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return NULL;
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}
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/*---------------------------------------------------------------------------*/
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void
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coap_check_transactions()
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{
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coap_transaction_t *t = NULL;
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for(t = (coap_transaction_t *)list_head(transactions_list); t; t = t->next) {
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if(etimer_expired(&t->retrans_timer)) {
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++(t->retrans_counter);
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PRINTF("Retransmitting %u (%u)\n", t->mid, t->retrans_counter);
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coap_send_transaction(t);
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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