osd-contiki/examples/er-rest-example/resources/res-plugtest-obs.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
* ETSI Plugtest resource
* \author
* Matthias Kovatsch <kovatsch@inf.ethz.ch>
*/
#include <string.h>
#include "rest-engine.h"
#include "er-coap.h"
#include "er-coap-observe.h"
#include "er-plugtest.h"
static void res_get_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
static void res_put_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
static void res_delete_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
static void res_periodic_handler(void);
PERIODIC_RESOURCE(res_plugtest_obs,
"title=\"Observable resource which changes every 5 seconds\";obs",
res_get_handler,
NULL,
res_put_handler,
res_delete_handler,
5 * CLOCK_SECOND,
res_periodic_handler);
static int32_t obs_counter = 0;
static char obs_content[MAX_PLUGFEST_BODY];
static size_t obs_content_len = 0;
static unsigned int obs_format = 0;
static char obs_status = 0;
static void
obs_purge_list()
{
PRINTF("### SERVER ACTION ### Purging obs list");
coap_remove_observer_by_uri(NULL, 0, res_plugtest_obs.url);
}
static void
res_get_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
/* Keep server log clean from ticking events */
if(request != NULL) {
PRINTF("/obs GET\n");
}
REST.set_header_content_type(response, obs_format);
REST.set_header_max_age(response, 5);
if(obs_content_len) {
REST.set_header_content_type(response, obs_format);
REST.set_response_payload(response, obs_content, obs_content_len);
} else {
REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
REST.set_response_payload(response, obs_content,
snprintf(obs_content, MAX_PLUGFEST_PAYLOAD, "TICK %lu", obs_counter));
}
/* A post_handler that handles subscriptions will be called for periodic resources by the REST framework. */
}
static void
res_put_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
uint8_t *incoming = NULL;
unsigned int ct = -1;
REST.get_header_content_type(request, &ct);
PRINTF("/obs PUT\n");
if(ct != obs_format) {
obs_status = 1;
obs_format = ct;
} else {
obs_content_len = REST.get_request_payload(request,
(const uint8_t **)&incoming);
memcpy(obs_content, incoming, obs_content_len);
res_periodic_handler();
}
REST.set_response_status(response, REST.status.CHANGED);
}
static void
res_delete_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
PRINTF("/obs DELETE\n");
obs_status = 2;
REST.set_response_status(response, REST.status.DELETED);
}
/*
* Additionally, a handler function named [resource name]_handler must be implemented for each PERIODIC_RESOURCE.
* It will be called by the REST manager process with the defined period.
*/
static void
res_periodic_handler()
{
++obs_counter;
/* PRINTF("TICK %u for /%s\n", obs_counter, r->url); */
if(obs_status == 1) {
/* Notify the registered observers with the given message type, observe option, and payload. */
REST.notify_subscribers(&res_plugtest_obs);
PRINTF("######### sending 5.00\n");
obs_purge_list();
} else if(obs_status == 2) {
/* Notify the registered observers with the given message type, observe option, and payload. */
REST.notify_subscribers(&res_plugtest_obs);
obs_purge_list();
obs_counter = 0;
obs_content_len = 0;
} else {
/* Notify the registered observers with the given message type, observe option, and payload. */
REST.notify_subscribers(&res_plugtest_obs);
} obs_status = 0;
}