mirror of
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522 lines
16 KiB
C
522 lines
16 KiB
C
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/*
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* Copyright (c) 2011-2012, Swedish Institute of Computer Science.
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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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* This file is part of the Contiki operating system.
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*/
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/**
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* \file
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* JSON webservice util
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* \author
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* Niclas Finne <nfi@sics.se>
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* Joakim Eriksson <joakime@sics.se>
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* Joel Hoglund <joel@sics.se>
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*/
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#include "contiki.h"
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#if PLATFORM_HAS_LEDS
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#include "dev/leds.h"
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#endif
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#include "httpd-ws.h"
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#include "jsontree.h"
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#include "jsonparse.h"
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#include "json-ws.h"
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#include <stdio.h>
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#include <string.h>
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#define DEBUG 0
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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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#ifdef JSON_WS_CONF_CALLBACK_PROTO
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#define CALLBACK_PROTO JSON_WS_CONF_CALLBACK_PROTO
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#else
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#define CALLBACK_PROTO "http"
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#endif /* JSON_WS_CONF_CALLBACK_PROTO */
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#ifdef JSON_WS_CONF_CALLBACK_PORT
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#define CALLBACK_PORT JSON_WS_CONF_CALLBACK_PORT
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#else
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#define CALLBACK_PORT 8080;
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#endif /* JSON_WS_CONF_CALLBACK_PORT */
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/* Predefined startup-send interval */
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#ifdef JSON_WS_CONF_CALLBACK_INTERVAL
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#define SEND_INTERVAL JSON_WS_CONF_CALLBACK_INTERVAL
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#else
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#define SEND_INTERVAL 120
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#endif
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static const char http_content_type_json[] = "application/json";
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/* Maximum 40 chars in host name?: 5 x 8 */
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static char callback_host[40] = "[aaaa::1]";
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static uint16_t callback_port = CALLBACK_PORT;
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static uint16_t callback_interval = SEND_INTERVAL;
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static char callback_path[80] = "/debug/";
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static char callback_appdata[80] = "";
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static char callback_proto[8] = CALLBACK_PROTO;
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static const char *callback_json_path = NULL;
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static struct jsontree_object *tree;
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static struct ctimer periodic_timer;
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long json_time_offset = 0;
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/* support for submitting to cosm */
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#if WITH_COSM
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extern struct jsontree_callback cosm_value_callback;
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JSONTREE_OBJECT_EXT(cosm_tree,
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JSONTREE_PAIR("current_value", &cosm_value_callback));
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#endif /* WITH_COSM */
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static void periodic(void *ptr);
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/*---------------------------------------------------------------------------*/
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static void
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json_copy_string(struct jsonparse_state *parser, char *string, int len)
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{
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jsonparse_next(parser);
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jsonparse_next(parser);
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jsonparse_copy_value(parser, string, len);
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}
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/*---------------------------------------------------------------------------*/
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static int
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cfg_get(struct jsontree_context *js_ctx)
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{
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const char *path = jsontree_path_name(js_ctx, js_ctx->depth - 1);
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if(strncmp(path, "host", 4) == 0) {
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jsontree_write_string(js_ctx, callback_host);
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} else if(strncmp(path, "port", 4) == 0) {
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jsontree_write_int(js_ctx, callback_port);
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} else if(strncmp(path, "interval", 8) == 0) {
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jsontree_write_int(js_ctx, callback_interval);
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} else if(strncmp(path, "path", 4) == 0) {
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jsontree_write_string(js_ctx, callback_path);
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} else if(strncmp(path, "appdata", 7) == 0) {
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jsontree_write_string(js_ctx, callback_appdata[0] == '\0' ? "" : "***");
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} else if(strncmp(path, "proto", 5) == 0) {
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jsontree_write_string(js_ctx, callback_proto);
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}
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return 0;
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}
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static int
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cfg_set(struct jsontree_context *js_ctx, struct jsonparse_state *parser)
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{
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int type;
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int update = 0;
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while((type = jsonparse_next(parser)) != 0) {
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if(type == JSON_TYPE_PAIR_NAME) {
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if(jsonparse_strcmp_value(parser, "host") == 0) {
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json_copy_string(parser, callback_host, sizeof(callback_host));
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update++;
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} else if(jsonparse_strcmp_value(parser, "path") == 0) {
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json_copy_string(parser, callback_path, sizeof(callback_path));
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update++;
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} else if(jsonparse_strcmp_value(parser, "appdata") == 0) {
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json_copy_string(parser, callback_appdata, sizeof(callback_appdata));
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update++;
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} else if(jsonparse_strcmp_value(parser, "proto") == 0) {
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json_copy_string(parser, callback_proto, sizeof(callback_proto));
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update++;
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} else if(jsonparse_strcmp_value(parser, "port") == 0) {
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jsonparse_next(parser);
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jsonparse_next(parser);
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callback_port = jsonparse_get_value_as_int(parser);
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if(callback_port == 0) {
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callback_port = CALLBACK_PORT;
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}
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update++;
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} else if(jsonparse_strcmp_value(parser, "interval") == 0) {
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jsonparse_next(parser);
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jsonparse_next(parser);
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callback_interval = jsonparse_get_value_as_int(parser);
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if(callback_interval == 0) {
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callback_interval = SEND_INTERVAL;
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}
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update++;
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}
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}
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}
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if(update && callback_json_path != NULL) {
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#if WITH_UDP
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if(strncmp(callback_proto, "udp", 3) == 0) {
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json_ws_udp_setup(callback_host, callback_port);
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}
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#endif
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ctimer_set(&periodic_timer, CLOCK_SECOND * callback_interval,
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periodic, NULL);
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}
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return 0;
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}
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static struct jsontree_callback cfg_callback =
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JSONTREE_CALLBACK(cfg_get, cfg_set);
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JSONTREE_OBJECT_EXT(json_subscribe_callback,
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JSONTREE_PAIR("host", &cfg_callback),
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JSONTREE_PAIR("port", &cfg_callback),
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JSONTREE_PAIR("path", &cfg_callback),
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JSONTREE_PAIR("appdata", &cfg_callback),
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JSONTREE_PAIR("proto", &cfg_callback),
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JSONTREE_PAIR("interval", &cfg_callback));
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/*---------------------------------------------------------------------------*/
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static int
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time_get(struct jsontree_context *js_ctx)
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{
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/* unix time */
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char buf[20];
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unsigned long time = json_time_offset + clock_seconds();
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snprintf(buf, 20, "%lu", time);
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jsontree_write_atom(js_ctx, buf);
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return 0;
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}
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static int
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time_set(struct jsontree_context *js_ctx, struct jsonparse_state *parser)
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{
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int type;
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unsigned long time;
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while((type = jsonparse_next(parser)) != 0) {
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if(type == JSON_TYPE_PAIR_NAME) {
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if(jsonparse_strcmp_value(parser, "time") == 0) {
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jsonparse_next(parser);
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jsonparse_next(parser);
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time = jsonparse_get_value_as_long(parser);
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json_time_offset = time - clock_seconds();
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}
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}
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}
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return 0;
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}
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struct jsontree_callback json_time_callback =
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JSONTREE_CALLBACK(time_get, time_set);
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/*---------------------------------------------------------------------------*/
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#if PLATFORM_HAS_LEDS
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#include "dev/leds.h"
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static int
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ws_leds_get(struct jsontree_context *js_ctx)
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{
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char buf[4];
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unsigned char leds = leds_get();
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snprintf(buf, 4, "%u", leds);
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jsontree_write_atom(js_ctx, buf);
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return 0;
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}
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static int
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ws_leds_set(struct jsontree_context *js_ctx, struct jsonparse_state *parser)
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{
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int type, old_leds, new_leds;
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while((type = jsonparse_next(parser)) != 0) {
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if(type == JSON_TYPE_PAIR_NAME) {
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if(jsonparse_strcmp_value(parser, "leds") == 0) {
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jsonparse_next(parser);
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jsonparse_next(parser);
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new_leds = jsonparse_get_value_as_int(parser);
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old_leds = leds_get();
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leds_on(~old_leds & new_leds);
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leds_off(old_leds & ~new_leds);
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}
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}
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}
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return 0;
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}
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struct jsontree_callback json_leds_callback =
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JSONTREE_CALLBACK(ws_leds_get, ws_leds_set);
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#endif /* PLATFORM_HAS_LEDS */
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/*---------------------------------------------------------------------------*/
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static struct httpd_ws_state *json_putchar_context;
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static int
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json_putchar(int c)
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{
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if(json_putchar_context != NULL &&
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json_putchar_context->outbuf_pos < HTTPD_OUTBUF_SIZE) {
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json_putchar_context->outbuf[json_putchar_context->outbuf_pos++] = c;
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return c;
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}
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return 0;
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}
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static int putchar_size = 0;
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static int
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json_putchar_count(int c)
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{
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putchar_size++;
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return c;
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}
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/*---------------------------------------------------------------------------*/
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static
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PT_THREAD(send_values(struct httpd_ws_state *s))
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{
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json_putchar_context = s;
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PSOCK_BEGIN(&s->sout);
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s->json.putchar = json_putchar;
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s->outbuf_pos = 0;
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if(s->json.values[0] == NULL) {
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/* Nothing to do */
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} else if(s->request_type == HTTPD_WS_POST &&
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s->state == HTTPD_WS_STATE_OUTPUT) {
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/* Set value */
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struct jsontree_value *v;
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struct jsontree_callback *c;
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while((v = jsontree_find_next(&s->json, JSON_TYPE_CALLBACK)) != NULL) {
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c = (struct jsontree_callback *)v;
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if(c->set != NULL) {
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struct jsonparse_state js;
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jsonparse_setup(&js, s->inputbuf, s->content_len);
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c->set(&s->json, &js);
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}
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}
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memcpy(s->outbuf, "{\"Status\":\"OK\"}", 15);
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s->outbuf_pos = 15;
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} else {
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/* Get value */
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while(jsontree_print_next(&s->json) && s->json.path <= s->json.depth) {
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if(s->outbuf_pos >= UIP_TCP_MSS) {
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SEND_STRING(&s->sout, s->outbuf, UIP_TCP_MSS);
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s->outbuf_pos -= UIP_TCP_MSS;
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if(s->outbuf_pos > 0) {
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memcpy(s->outbuf, &s->outbuf[UIP_TCP_MSS], s->outbuf_pos);
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}
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}
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}
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}
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if(s->outbuf_pos > 0) {
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SEND_STRING(&s->sout, s->outbuf, s->outbuf_pos);
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s->outbuf_pos = 0;
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}
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PSOCK_END(&s->sout);
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}
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/*---------------------------------------------------------------------------*/
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struct jsontree_value *
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find_json_path(struct jsontree_context *json, const char *path)
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{
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struct jsontree_value *v;
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const char *start;
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const char *end;
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int len;
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v = json->values[0];
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start = path;
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do {
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end = strchr(start, '/');
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if(end == start) {
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break;
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}
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if(end != NULL) {
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len = end - start;
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end++;
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} else {
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len = strlen(start);
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}
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if(v->type != JSON_TYPE_OBJECT) {
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v = NULL;
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} else {
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struct jsontree_object *o;
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int i;
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o = (struct jsontree_object *)v;
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v = NULL;
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for(i = 0; i < o->count; i++) {
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if(strncmp(start, o->pairs[i].name, len) == 0) {
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v = o->pairs[i].value;
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json->index[json->depth] = i;
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json->depth++;
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json->values[json->depth] = v;
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json->index[json->depth] = 0;
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break;
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}
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}
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}
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start = end;
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} while(end != NULL && *end != '\0' && v != NULL);
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json->callback_state = 0;
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return v;
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}
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/*---------------------------------------------------------------------------*/
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static int
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calculate_json_size(const char *path, struct jsontree_value *v)
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{
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/* check size of JSON expression */
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struct jsontree_context json;
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json.values[0] = (v == NULL) ? (struct jsontree_value *)tree : v;
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jsontree_reset(&json);
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if(path != NULL) {
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find_json_path(&json, path);
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}
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json.path = json.depth;
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json.putchar = json_putchar_count;
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putchar_size = 0;
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while(jsontree_print_next(&json) && json.path <= json.depth);
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return putchar_size;
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}
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/*---------------------------------------------------------------------------*/
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httpd_ws_script_t
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httpd_ws_get_script(struct httpd_ws_state *s)
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{
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struct jsontree_value *v;
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s->json.values[0] = v = (struct jsontree_value *)tree;
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jsontree_reset(&s->json);
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if(s->filename[1] == '\0') {
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/* Default page: show full JSON tree. */
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} else {
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v = find_json_path(&s->json, &s->filename[1]);
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}
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if(v != NULL) {
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s->json.path = s->json.depth;
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s->content_type = http_content_type_json;
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return send_values;
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}
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return NULL;
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}
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/*---------------------------------------------------------------------------*/
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#if JSON_POST_EXTRA_HEADER || WITH_COSM
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static int
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||
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output_headers(struct httpd_ws_state *s, char *buffer, int buffer_size,
|
||
|
int index)
|
||
|
{
|
||
|
if(index == 0) {
|
||
|
#ifdef JSON_POST_EXTRA_HEADER
|
||
|
return snprintf(buffer, buffer_size, "%s\r\n", JSON_POST_EXTRA_HEADER);
|
||
|
} else if(index == 1) {
|
||
|
#endif
|
||
|
#if WITH_COSM
|
||
|
if(strncmp(callback_proto, "cosm", 4) == 0 && callback_appdata[0] != '\0') {
|
||
|
return snprintf(buffer, buffer_size, "X-PachubeApiKey:%s\r\n",
|
||
|
callback_appdata);
|
||
|
}
|
||
|
#endif
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
#endif /* JSON_POST_EXTRA_HEADER || WITH_COSM */
|
||
|
/*---------------------------------------------------------------------------*/
|
||
|
static void
|
||
|
periodic(void *ptr)
|
||
|
{
|
||
|
struct httpd_ws_state *s;
|
||
|
int callback_size;
|
||
|
|
||
|
if(callback_json_path != NULL && strlen(callback_host) > 2) {
|
||
|
ctimer_restart(&periodic_timer);
|
||
|
|
||
|
if(strncmp(callback_proto, "http", 4) == 0) {
|
||
|
callback_size = calculate_json_size(callback_json_path, NULL);
|
||
|
s = httpd_ws_request(HTTPD_WS_POST, callback_host, NULL, callback_port,
|
||
|
callback_path, http_content_type_json,
|
||
|
callback_size, send_values);
|
||
|
if(s != NULL) {
|
||
|
PRINTF("PERIODIC POST %s\n", callback_json_path);
|
||
|
#if JSON_POST_EXTRA_HEADER
|
||
|
s->output_extra_headers = output_headers;
|
||
|
#endif
|
||
|
s->json.values[0] = (struct jsontree_value *)tree;
|
||
|
jsontree_reset(&s->json);
|
||
|
find_json_path(&s->json, callback_json_path);
|
||
|
s->json.path = s->json.depth;
|
||
|
} else {
|
||
|
PRINTF("PERIODIC CALLBACK FAILED\n");
|
||
|
}
|
||
|
#if WITH_COSM
|
||
|
} else if(strncmp(callback_proto, "cosm", 4) == 0) {
|
||
|
callback_size = calculate_json_size(NULL, (struct jsontree_value *)
|
||
|
&cosm_tree);
|
||
|
/* printf("JSON Size:%d\n", callback_size); */
|
||
|
s = httpd_ws_request(HTTPD_WS_PUT, callback_host, "api.pachube.com",
|
||
|
callback_port, callback_path,
|
||
|
http_content_type_json, callback_size, send_values);
|
||
|
/* host = cosm host */
|
||
|
/* path => path to datastream / data point */
|
||
|
s->output_extra_headers = output_headers;
|
||
|
s->json.values[0] = (struct jsontree_value *)&cosm_tree;
|
||
|
jsontree_reset(&s->json);
|
||
|
s->json.path = 0;
|
||
|
|
||
|
PRINTF("PERIODIC cosm callback: %d\n", callback_size);
|
||
|
#endif /* WITH_COSM */
|
||
|
}
|
||
|
#if WITH_UDP
|
||
|
else {
|
||
|
callback_size = calculate_json_size(callback_json_path, NULL);
|
||
|
PRINTF("PERIODIC UDP size: %d\n", callback_size);
|
||
|
json_ws_udp_send(tree, callback_json_path);
|
||
|
}
|
||
|
#endif /* WITH_UDP */
|
||
|
} else {
|
||
|
printf("PERIODIC CALLBACK - nothing todo\n");
|
||
|
}
|
||
|
}
|
||
|
/*---------------------------------------------------------------------------*/
|
||
|
void
|
||
|
json_ws_init(struct jsontree_object *json)
|
||
|
{
|
||
|
PRINTF("JSON INIT (callback %s every %u seconds)\n",
|
||
|
CALLBACK_PROTO, SEND_INTERVAL);
|
||
|
tree = json;
|
||
|
ctimer_set(&periodic_timer, CLOCK_SECOND * SEND_INTERVAL, periodic, NULL);
|
||
|
process_start(&httpd_ws_process, NULL);
|
||
|
#if WITH_UDP
|
||
|
if(strncmp(callback_proto, "udp", 3) == 0) {
|
||
|
json_ws_udp_setup(callback_host, callback_port);
|
||
|
}
|
||
|
#endif /* WITH_UDP */
|
||
|
}
|
||
|
/*---------------------------------------------------------------------------*/
|
||
|
void
|
||
|
json_ws_set_callback(const char *path)
|
||
|
{
|
||
|
callback_json_path = path;
|
||
|
ctimer_restart(&periodic_timer);
|
||
|
}
|
||
|
/*---------------------------------------------------------------------------*/
|