nes-proj/os/net/app-layer/coap/coap-callback-api.c

158 lines
5.0 KiB
C

/*
* Copyright (c) 2016, SICS Swedish ICT
* 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.
*
*
*/
/**
* \file
* Callback API for doing CoAP requests
* Adapted from the blocking API
* \author
* Joakim Eriksson, joakime@sics.se
*/
/**
* \addtogroup coap
* @{
*/
#include "coap-engine.h"
#include "coap-callback-api.h"
#include "coap-transactions.h"
#include "sys/cc.h"
#include <stdlib.h>
#include <string.h>
/* Log configuration */
#include "coap-log.h"
#define LOG_MODULE "coap"
#define LOG_LEVEL LOG_LEVEL_COAP
/* These should go into the state struct so that we can have multiple
requests */
static uint32_t res_block;
static uint8_t more;
static uint8_t block_error;
static void coap_request_callback(void *callback_data, coap_message_t *response);
/*---------------------------------------------------------------------------*/
static void
progress_request(coap_request_state_t *state) {
coap_message_t *request = state->request;
request->mid = coap_get_mid();
if((state->transaction =
coap_new_transaction(request->mid, state->remote_endpoint))) {
state->transaction->callback = coap_request_callback;
state->transaction->callback_data = state;
if(state->block_num > 0) {
coap_set_header_block2(request, state->block_num, 0,
COAP_MAX_CHUNK_SIZE);
}
state->transaction->message_len =
coap_serialize_message(request, state->transaction->message);
coap_send_transaction(state->transaction);
LOG_DBG("Requested #%"PRIu32" (MID %u)\n", state->block_num, request->mid);
}
}
/*---------------------------------------------------------------------------*/
static void
coap_request_callback(void *callback_data, coap_message_t *response)
{
coap_request_state_t *state = (coap_request_state_t *)callback_data;
uint32_t res_block1;
state->response = response;
LOG_DBG("request callback\n");
if(!state->response) {
LOG_WARN("Server not responding giving up...\n");
state->callback(state);
return;
}
/* Got a response */
coap_get_header_block2(state->response, &res_block, &more, NULL, NULL);
coap_get_header_block1(state->response, &res_block1, NULL, NULL, NULL);
LOG_DBG("Received #%lu%s B1:%lu (%u bytes)\n",
(unsigned long)res_block, (unsigned)more ? "+" : "",
(unsigned long)res_block1,
state->response->payload_len);
if(res_block == state->block_num) {
/* Call the callback function as we have more data */
state->callback(state);
/* this is only for counting BLOCK2 blocks.*/
++(state->block_num);
} else {
LOG_WARN("WRONG BLOCK %"PRIu32"/%"PRIu32"\n", res_block, state->block_num);
++block_error;
}
if(more && block_error < COAP_MAX_ATTEMPTS) {
progress_request(state);
} else {
/* failure - now we give up and notify the callback */
state->response = NULL;
state->callback(state);
}
}
/*---------------------------------------------------------------------------*/
void
coap_send_request(coap_request_state_t *state, coap_endpoint_t *endpoint,
coap_message_t *request,
void (*callback)(coap_request_state_t *state))
{
/* can we have these variables shared between multiple requests? */
/* ripped from blocking request */
more = 0;
res_block = 0;
block_error = 0;
state->block_num = 0;
state->response = NULL;
state->request = request;
state->remote_endpoint = endpoint;
state->callback = callback;
progress_request(state);
}
/*---------------------------------------------------------------------------*/
/** @} */