Factor resources, fix time
Now there is a generic resource that can generate and parse application/json as well as text/plain. It can be re-used, only the from_string and to_string routines have to be written and the resource properly set up. A new resource format is specified, see GENERIC_RESOURCE in, e.g., examples/osd/pwm-example. This is now used in all my examples, namely pwm-example, arduino-sketch, wallclock-time. There was an off by one error for the month in time formatting (in gmtime and localtime). And the leap-year computation was broken. Both fixed now, so we get a correct date. For localtime we are still 2 hours off because daylight saving isn't implemented yet. Also renamed gmtime to utc.
This commit is contained in:
Ralf Schlatterbeck
parent
4f20df042f
commit
d5284eebe1
12 changed files with 488 additions and 612 deletions
209
apps/json-resource/generic_resource.c
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209
apps/json-resource/generic_resource.c
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/*
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* Copyright (c) 2014, Ralf Schlatterbeck Open Source Consulting
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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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* \addtogroup Generic CoAP Resource Handler
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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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* Generic CoAP Resource Handler
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* \author
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* Ralf Schlatterbeck <rsc@runtux.com>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "contiki.h"
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#include "jsonparse.h"
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/* Only coap 13 for now */
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#include "er-coap-13.h"
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#include "generic_resource.h"
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/* Error-handling macro */
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# define BYE(_exp, _tag) \
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do { \
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PRINTF("Expect "_exp": %d\n",_tag); \
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return -1; \
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} while(0)
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#define DEBUG 1
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#if DEBUG
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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int8_t
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json_parse_variable
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(const uint8_t *bytes, size_t len, char *name, char *buf, size_t buflen)
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{
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int tag = 0;
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struct jsonparse_state state;
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struct jsonparse_state *parser = &state;
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PRINTF ("PUT: len: %d, %s\n", len, (const char *)bytes);
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jsonparse_setup (parser, (const char *)bytes, len);
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if ((tag = jsonparse_next (parser)) != JSON_TYPE_OBJECT) {
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BYE ("OBJECT", tag);
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}
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if ((tag = jsonparse_next (parser)) != JSON_TYPE_PAIR_NAME) {
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BYE ("PAIR_NAME", tag);
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}
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while (jsonparse_strcmp_value (parser, name) != 0) {
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tag = jsonparse_next (parser);
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if (tag != JSON_TYPE_PAIR) {
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BYE ("PAIR", tag);
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}
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tag = jsonparse_next (parser);
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tag = jsonparse_next (parser);
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if (tag != ',') {
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BYE (",", tag);
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}
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tag = jsonparse_next (parser);
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if (tag != JSON_TYPE_PAIR_NAME) {
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BYE ("PAIR_NAME", tag);
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}
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}
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tag = jsonparse_next (parser);
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if (tag != JSON_TYPE_PAIR) {
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BYE ("PAIR", tag);
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}
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tag = jsonparse_next (parser);
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if (tag != JSON_TYPE_STRING) {
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BYE ("STRING", tag);
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}
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jsonparse_copy_value (parser, buf, buflen);
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return 0;
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}
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void generic_handler
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( void *request
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, void *response
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, uint8_t *buffer
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, uint16_t preferred_size
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, int32_t *offset
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, char *name
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, void (*from_str)(const char *name, const char *s)
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, size_t (*to_str)(const char *name, uint8_t is_json, char *buf, size_t bsize)
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)
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{
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int success = 1;
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char temp [100];
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int i = 0;
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size_t len = 0;
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int n_acc = 0;
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const uint8_t *bytes = NULL;
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const uint16_t *accept = NULL;
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uint16_t a_ctype = REST.type.APPLICATION_JSON;
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uint16_t c_ctype = REST.get_header_content_type (request);
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/* Seems like accepted type is currently unsupported? */
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n_acc = REST.get_header_accept (request, &accept);
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for (i=0; i<n_acc; i++) {
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if ( accept [i] == REST.type.TEXT_PLAIN
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|| accept [i] == REST.type.APPLICATION_JSON
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)
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{
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a_ctype = accept [i];
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break;
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}
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}
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switch(REST.get_method_type(request)) {
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case METHOD_GET:
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// TEXT format
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if (a_ctype == REST.type.TEXT_PLAIN) {
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len += to_str (name, 0, temp + len, sizeof (temp) - len);
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if (len > sizeof (temp)) {
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success = 0;
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break;
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}
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len += snprintf (temp + len, sizeof (temp) - len, "\n");
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if (len > sizeof (temp)) {
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success = 0;
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break;
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}
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} else { // jSON Format
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len += snprintf
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(temp + len, sizeof (temp) - len, "{\n \"%s\" : ", name);
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if (len > sizeof (temp)) {
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success = 0;
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break;
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}
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len += to_str (name, 1, temp + len, sizeof (temp) - len);
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if (len > sizeof (temp)) {
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success = 0;
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break;
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}
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len += snprintf (temp + len, sizeof (temp) - len, "\n}\n");
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if (len > sizeof (temp)) {
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success = 0;
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break;
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}
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}
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memcpy (buffer, temp, len);
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REST.set_header_content_type (response, a_ctype);
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REST.set_response_payload (response, buffer, len);
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break;
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case METHOD_PUT:
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if (from_str && (len = coap_get_payload(request, &bytes))) {
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if (c_ctype == REST.type.TEXT_PLAIN) {
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temp [sizeof (temp) - 1] = 0;
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strncpy (temp, (const char *)bytes, MIN (len, sizeof (temp) - 1));
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} else { // jSON Format
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if (json_parse_variable (bytes, len, name, temp, sizeof (temp)) < 0) {
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success = 0;
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break;
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}
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}
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from_str (name, temp);
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REST.set_response_status(response, REST.status.CHANGED);
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} else {
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success = 0;
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}
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break;
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default:
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success = 0;
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}
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if (!success) {
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REST.set_response_status(response, REST.status.BAD_REQUEST);
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}
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}
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/*
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* VI settings, see coding style
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* ex:ts=8:et:sw=2
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*/
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/** @} */
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