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