180 lines
6.4 KiB
C
180 lines
6.4 KiB
C
/*
|
|
* Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
|
|
* 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 Institute 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 INSTITUTE 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 INSTITUTE 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.
|
|
*
|
|
* This file is part of the Contiki operating system.
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* CoAP module for reliable transport
|
|
* \author
|
|
* Matthias Kovatsch <kovatsch@inf.ethz.ch>
|
|
*/
|
|
|
|
#include "contiki.h"
|
|
#include "contiki-net.h"
|
|
#include "er-coap-transactions.h"
|
|
#include "er-coap-observe.h"
|
|
|
|
#define DEBUG 0
|
|
#if DEBUG
|
|
#include <stdio.h>
|
|
#define PRINTF(...) printf(__VA_ARGS__)
|
|
#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])
|
|
#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])
|
|
#else
|
|
#define PRINTF(...)
|
|
#define PRINT6ADDR(addr)
|
|
#define PRINTLLADDR(addr)
|
|
#endif
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
MEMB(transactions_memb, coap_transaction_t, COAP_MAX_OPEN_TRANSACTIONS);
|
|
LIST(transactions_list);
|
|
|
|
static struct process *transaction_handler_process = NULL;
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
/*- Internal API ------------------------------------------------------------*/
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
coap_register_as_transaction_handler()
|
|
{
|
|
transaction_handler_process = PROCESS_CURRENT();
|
|
}
|
|
coap_transaction_t *
|
|
coap_new_transaction(uint16_t mid, uip_ipaddr_t *addr, uint16_t port)
|
|
{
|
|
coap_transaction_t *t = memb_alloc(&transactions_memb);
|
|
|
|
if(t) {
|
|
t->mid = mid;
|
|
t->retrans_counter = 0;
|
|
|
|
/* save client address */
|
|
uip_ipaddr_copy(&t->addr, addr);
|
|
t->port = port;
|
|
|
|
list_add(transactions_list, t); /* list itself makes sure same element is not added twice */
|
|
}
|
|
|
|
return t;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
coap_send_transaction(coap_transaction_t *t)
|
|
{
|
|
PRINTF("Sending transaction %u\n", t->mid);
|
|
|
|
coap_send_message(&t->addr, t->port, t->packet, t->packet_len);
|
|
|
|
if(COAP_TYPE_CON ==
|
|
((COAP_HEADER_TYPE_MASK & t->packet[0]) >> COAP_HEADER_TYPE_POSITION)) {
|
|
if(t->retrans_counter < COAP_MAX_RETRANSMIT) {
|
|
/* not timed out yet */
|
|
PRINTF("Keeping transaction %u\n", t->mid);
|
|
|
|
if(t->retrans_counter == 0) {
|
|
t->retrans_timer.timer.interval =
|
|
COAP_RESPONSE_TIMEOUT_TICKS + (random_rand()
|
|
%
|
|
(clock_time_t)
|
|
COAP_RESPONSE_TIMEOUT_BACKOFF_MASK);
|
|
PRINTF("Initial interval %f\n",
|
|
(float)t->retrans_timer.timer.interval / CLOCK_SECOND);
|
|
} else {
|
|
t->retrans_timer.timer.interval <<= 1; /* double */
|
|
PRINTF("Doubled (%u) interval %f\n", t->retrans_counter,
|
|
(float)t->retrans_timer.timer.interval / CLOCK_SECOND);
|
|
}
|
|
|
|
PROCESS_CONTEXT_BEGIN(transaction_handler_process);
|
|
etimer_restart(&t->retrans_timer); /* interval updated above */
|
|
PROCESS_CONTEXT_END(transaction_handler_process);
|
|
|
|
t = NULL;
|
|
} else {
|
|
/* timed out */
|
|
PRINTF("Timeout\n");
|
|
restful_response_handler callback = t->callback;
|
|
void *callback_data = t->callback_data;
|
|
|
|
/* handle observers */
|
|
coap_remove_observer_by_client(&t->addr, t->port);
|
|
|
|
coap_clear_transaction(t);
|
|
|
|
if(callback) {
|
|
callback(callback_data, NULL);
|
|
}
|
|
}
|
|
} else {
|
|
coap_clear_transaction(t);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
coap_clear_transaction(coap_transaction_t *t)
|
|
{
|
|
if(t) {
|
|
PRINTF("Freeing transaction %u: %p\n", t->mid, t);
|
|
|
|
etimer_stop(&t->retrans_timer);
|
|
list_remove(transactions_list, t);
|
|
memb_free(&transactions_memb, t);
|
|
}
|
|
}
|
|
coap_transaction_t *
|
|
coap_get_transaction_by_mid(uint16_t mid)
|
|
{
|
|
coap_transaction_t *t = NULL;
|
|
|
|
for(t = (coap_transaction_t *)list_head(transactions_list); t; t = t->next) {
|
|
if(t->mid == mid) {
|
|
PRINTF("Found transaction for MID %u: %p\n", t->mid, t);
|
|
return t;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
coap_check_transactions()
|
|
{
|
|
coap_transaction_t *t = NULL;
|
|
|
|
for(t = (coap_transaction_t *)list_head(transactions_list); t; t = t->next) {
|
|
if(etimer_expired(&t->retrans_timer)) {
|
|
++(t->retrans_counter);
|
|
PRINTF("Retransmitting %u (%u)\n", t->mid, t->retrans_counter);
|
|
coap_send_transaction(t);
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|