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

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/*
* 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 implementation for the REST Engine.
* \author
* Matthias Kovatsch <kovatsch@inf.ethz.ch>
*/
/**
* \addtogroup coap
* @{
*/
#include "coap-engine.h"
#include "coap-blocking-api.h"
#include "sys/cc.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <inttypes.h>
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/* Log configuration */
#include "coap-log.h"
#define LOG_MODULE "coap"
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#define LOG_LEVEL LOG_LEVEL_COAP
/*---------------------------------------------------------------------------*/
/*- Client Part -------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
void
coap_blocking_request_callback(void *callback_data, coap_message_t *response)
{
coap_blocking_request_state_t *blocking_state = (coap_blocking_request_state_t *)callback_data;
blocking_state->state.response = response;
process_poll(blocking_state->process);
}
/*---------------------------------------------------------------------------*/
PT_THREAD(coap_blocking_request
(coap_blocking_request_state_t *blocking_state, process_event_t ev,
coap_endpoint_t *remote_ep,
coap_message_t *request,
coap_blocking_response_handler_t request_callback))
{
/* Before PT_BEGIN in order to not be a local variable in the PT_Thread and maintain it */
coap_request_state_t *state = &blocking_state->state;
PT_BEGIN(&blocking_state->pt);
state->block_num = 0;
state->response = NULL;
blocking_state->process = PROCESS_CURRENT();
state->more = 0;
state->res_block = 0;
state->block_error = 0;
do {
request->mid = coap_get_mid();
if((state->transaction = coap_new_transaction(request->mid, remote_ep))) {
state->transaction->callback = coap_blocking_request_callback;
state->transaction->callback_data = blocking_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);
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LOG_DBG("Requested #%"PRIu32" (MID %u)\n", state->block_num, request->mid);
PT_YIELD_UNTIL(&blocking_state->pt, ev == PROCESS_EVENT_POLL);
if(!state->response) {
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LOG_WARN("Server not responding\n");
state->status = COAP_REQUEST_STATUS_TIMEOUT;
PT_EXIT(&blocking_state->pt);
}
coap_get_header_block2(state->response, &state->res_block, &state->more, NULL, NULL);
LOG_DBG("Received #%"PRIu32"%s (%u bytes)\n", state->res_block, state->more ? "+" : "",
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state->response->payload_len);
if(state->more) {
state->status = COAP_REQUEST_STATUS_MORE;
} else {
state->status = COAP_REQUEST_STATUS_RESPONSE;
}
if(state->res_block == state->block_num) {
request_callback(state->response);
++(state->block_num);
} else {
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LOG_WARN("WRONG BLOCK %"PRIu32"/%"PRIu32"\n",
state->res_block, state->block_num);
++(state->block_error);
}
} else {
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LOG_WARN("Could not allocate transaction buffer");
PT_EXIT(&blocking_state->pt);
}
} while(state->more && (state->block_error) < COAP_MAX_ATTEMPTS);
if((state->block_error) >= COAP_MAX_ATTEMPTS) {
/* failure - now we give up */
state->status = COAP_REQUEST_STATUS_BLOCK_ERROR;
} else {
/* No more blocks, request finished */
state->status = COAP_REQUEST_STATUS_FINISHED;
}
PT_END(&blocking_state->pt);
}
/*---------------------------------------------------------------------------*/
/** @} */