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px4-firmware/apps/examples/wgetjson/wgetjson_main.c

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/****************************************************************************
* examples/wgetjson/wgetjson_main.c
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Darcy Gong
*
* 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 NuttX 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 COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <apps/netutils/uiplib.h>
#include <apps/netutils/webclient.h>
#include <apps/netutils/cJSON.h>
/****************************************************************************
* Definitions
****************************************************************************/
#ifndef CONFIG_EXAMPLES_WGETJSON_MAXSIZE
# define CONFIG_EXAMPLES_WGETJSON_MAXSIZE 1024
#endif
#ifndef CONFIG_EXAMPLES_WGETJSON_URL
# define CONFIG_EXAMPLES_WGETJSON_URL "http://10.0.0.1/wgetjson/json_cmd.php"
#endif
#ifndef CONFIG_EXAMPLES_WGETPOST_URL
# define CONFIG_EXAMPLES_WGETPOST_URL "http://10.0.0.1/wgetjson/post_cmd.php"
#endif
#define MULTI_POST_NDATA 3
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
static char *g_json_buff = NULL;
static int g_json_bufflen = 0;
static bool g_has_json = false;
/****************************************************************************
* Private Functions
****************************************************************************/
static void wgetjson_postdebug_callback(FAR char **buffer, int offset,
int datend, FAR int *buflen,
FAR void *arg)
{
int len = datend - offset;
if (len <= 0)
{
printf("Callback No Data!\n");
return;
}
((*buffer)[datend]) = '\0';
printf("Callback Data(Length:%d):\n%s\n", len, &((*buffer)[offset]));
}
/****************************************************************************
* Name: wgetjson_callback
****************************************************************************/
static void wgetjson_callback(FAR char **buffer, int offset, int datend,
FAR int *buflen, FAR void *arg)
{
int len = datend - offset,org=len;
if (len <= 0)
{
return;
}
if (!g_json_buff)
{
g_json_buff = malloc(len + 1);
memcpy(g_json_buff, &((*buffer)[offset]), len);
g_json_buff[len] = 0;
g_json_bufflen = len;
}
else
{
if (g_json_bufflen >= CONFIG_EXAMPLES_WGETJSON_MAXSIZE)
{
g_json_bufflen += org;
return;
}
if (g_json_bufflen+len > CONFIG_EXAMPLES_WGETJSON_MAXSIZE)
{
len = CONFIG_EXAMPLES_WGETJSON_MAXSIZE - g_json_bufflen;
}
g_json_buff = realloc(g_json_buff, g_json_bufflen + len + 1);
memcpy(&g_json_buff[g_json_bufflen-1], &((*buffer)[offset]), len);
g_json_buff[g_json_bufflen + len] = 0;
g_json_bufflen += org;
}
}
/****************************************************************************
* Name: wgetjson_json_release
****************************************************************************/
static void wgetjson_json_release(void)
{
if (g_json_buff)
{
free(g_json_buff);
g_json_buff = NULL;
}
g_json_bufflen = 0;
}
/****************************************************************************
* Name: wgetjson_doit
****************************************************************************/
#if 0 /* Not used */
static void wgetjson_doit(char *text)
{
char *out;
cJSON *json;
json = cJSON_Parse(text);
if (!json)
{
printf("Error before: [%s]\n",cJSON_GetErrorPtr());
}
else
{
out = cJSON_Print(json);
cJSON_Delete(json);
printf("%s\n", out);
free(out);
}
}
#endif
/****************************************************************************
* Name: wgetjson_json_item_callback
****************************************************************************/
static int wgetjson_json_item_callback(const char *name,int type,cJSON *item)
{
if (strlen(name) > 8 && !memcmp(name, "/(null)", 7))
{
name += 8;
g_has_json = true;
}
if (!strcmp(name, "name"))
{
printf("name:\t\t\t%s \n", item->valuestring);
// todo something....
}
else if (strcmp(name, "format/type")==0)
{
printf("format/type:\t\t%s \n", item->valuestring);
// todo something....
}
else if (!strcmp(name, "format/width"))
{
printf("format/width:\t\t%d \n", item->valueint);
// todo something....
}
else if (!strcmp(name, "format/height"))
{
printf("format/height:\t\t%d \n", item->valueint);
// todo something....
}
else if (!strcmp(name, "format/interlace"))
{
printf("format/interlace:\t%s \n", (item->valueint) ? "true" : "false");
// todo something....
}
else if (!strcmp(name, "format/frame rate"))
{
printf("format/frame rate:\t%d \n", item->valueint);
// todo something....
}
return 1;
}
/****************************************************************************
* Name: wgetjson_json_item_scan
****************************************************************************/
static void wgetjson_json_item_scan(cJSON *item, const char *prefix)
{
char *newprefix;
int dorecurse;
while (item)
{
newprefix = malloc(strlen(prefix) + strlen(item->string) + 2);
sprintf(newprefix, "%s/%s", prefix, item->string);
dorecurse = wgetjson_json_item_callback(newprefix, item->type, item);
if (item->child && dorecurse)
{
wgetjson_json_item_scan(item->child, newprefix);
}
item = item->next;
free(newprefix);
}
}
/****************************************************************************
* Name: wgetjson_json_parse
****************************************************************************/
static int wgetjson_json_parse(char *text)
{
cJSON *json;
char *path = "";
json=cJSON_Parse(text);
if (!json)
{
printf("Error before: [%s]\n", cJSON_GetErrorPtr());
return ERROR;
}
else
{
wgetjson_json_item_scan(json, path);
cJSON_Delete(json);
return OK;
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: wgetjson_main
****************************************************************************/
int wgetjson_main(int argc, char *argv[])
{
char *buffer = NULL;
int buffer_len = 512;
char *url = CONFIG_EXAMPLES_WGETJSON_URL;
int ret = -1;
int option;
bool is_post = false;
bool is_post_multi = false;
bool badarg=false;
bool is_debug=false;
char *post_buff = NULL;
int post_buff_len = 0;
char *post_single_name = "type";
char *post_single_value = "string";
char *post_multi_names[MULTI_POST_NDATA] = {"name", "gender", "country"};
char *post_multi_values[MULTI_POST_NDATA] = {"darcy", "man", "china"};
wget_callback_t wget_cb = wgetjson_callback;
while ((option = getopt(argc, argv, ":pPD")) != ERROR)
{
switch (option)
{
case 'p':
is_post = true;
break;
case 'P':
is_post = true;
is_post_multi = true;
break;
case 'D':
is_debug = true;
break;
case ':':
badarg = true;
break;
case '?':
default:
badarg = true;
break;
}
}
if (badarg)
{
printf("usage: wgetjson -p(single post) -P(multi post) -D(debug wget callback)\n");
return -1;
}
if (is_debug)
{
wget_cb = wgetjson_postdebug_callback;
}
if (is_post)
{
buffer_len = 512*2;
}
buffer = malloc(buffer_len);
wgetjson_json_release();
printf("URL: %s\n", url);
if (is_post)
{
url = CONFIG_EXAMPLES_WGETPOST_URL;
if (is_post_multi)
{
post_buff_len = web_posts_strlen(post_multi_names, post_multi_values, MULTI_POST_NDATA);
post_buff = malloc(post_buff_len);
web_posts_str(post_buff, &post_buff_len, post_multi_names, post_multi_values, MULTI_POST_NDATA);
}
else
{
post_buff_len = web_post_strlen(post_single_name, post_single_value);
post_buff = malloc(post_buff_len);
web_post_str(post_buff, &post_buff_len, post_single_name, post_single_value);
}
if (post_buff)
{
ret = wget_post(url, post_buff, buffer, buffer_len, wget_cb, NULL);
}
}
else
{
ret = wget(url, buffer, buffer_len, wget_cb , NULL);
}
if (ret < 0)
{
printf("get json size: %d\n",g_json_bufflen);
}
else if (!is_debug)
{
g_has_json = false;
if (wgetjson_json_parse(g_json_buff) == OK && g_has_json)
{
printf("Parse OK\n");
}
else
{
printf("Parse error\n");
}
g_has_json = false;
}
wgetjson_json_release();
free(buffer);
if (post_buff)
{
free(post_buff);
}
return 0;
}
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