AliOS Things 3.0应用笔记：http client简单应用

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简介： AliOS Things 3.0版本新增加了httpc组件（http 客户端组件），httpc组件支持多种RESTful的API调用，包括GET、POST、PUT、HEAD等，也支持https安全协议。

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简介
准备工作
创建应用工程
编写应用代码
- 添加http组件
- 天气API说明
- 使用http组件
- 完整源码
编译运行
参考文档

简介AliOS Things 3.0版本于9月27日在云栖大会正式发布，在新版本中带来了全新的应用开发框架，帮助用户快速构建自己的应用。使用户可以更专注于自身应用的开发。
AliOS Things 3.0版本新增加了httpc组件（http 客户端组件），httpc组件支持多种RESTful的API调用，包括GET、POST、PUT、HEAD等，也支持https安全协议。
准备工作参考 AliOS Things Environment Setup 和 AliOS Things 3.0 应用开发指南搭建好AliOS Things 3.0的应用开发环境。AliOS Things 3.0 应用开发指南 > AliOS Studio中创建应用工程
本示例新建的应用工程名称为httpclient_app，选择的开发板为developerkit。
编写应用代码新建好的应用工程文件如下面所示：

.httpclient_app
├── .aos             # AliOS Things 3.0 应用工程描述
├── .vscode          # AliOS Studio 配置文件
├── Config.in       # Menuconfig 配置文件
├── README.md       # 应用说明文档
├── aos.mk          # 编译文件
├── app_main.c       # 应用示例代码
└── k_app_config.h    # 内核配置

添加http组件aos-cube会自动根据include的头文件来自动添加组件。
http组件需要用到全局宏：BUILD_AOS，所以需要在aos.mk中额外增加一个全局宏定义：

GLOBAL_DEFINES += BUILD_AOS

天气API说明本示例使用http组件，发送http get请求获取天气数据，天气的API是中国天气网提供的API：http://www.weather.com.cn/data/sk/101210101.html，其中101210101代表是杭州。
使用curl命令可以测试该API接口：

$ curl http://www.weather.com.cn/data/sk/101210101.html
{"weatherinfo":{"city":"杭州","cityid":"101210101","temp":"24.8","WD":"东北风","WS":"小于3级","SD":"81%","AP":"1000.3hPa","njd":"暂无实况","WSE":"<3","time":"17:50","sm":"2.1","isRadar":"1","Radar":"JC_RADAR_AZ9571_JB"}}%

或者也可以在浏览器打开该链接测试API接口。
使用http组件本示例主要使用到了http如下接口，详细的http对外提供的接口和参数说明请参考include/network/http/http.h：

/* httpc 初始化 */
int8_t http_client_initialize(void);

/* 创建一个httpc实例 */
httpc_handle_t httpc_init(httpc_connection_t *settings);

/* 销毁一个httpc实例 */
int8_t httpc_deinit(httpc_handle_t httpc);

/* 发送http请求 */
int8_t httpc_send_request(httpc_handle_t httpc, int8_t method, char *uri,
                        const char *hdr, const char *content_type,
                        const char *param, uint16_t param_len);

/* 构建http请求header */
int32_t httpc_construct_header(char *buf, uint16_t buf_size, const char *name, const char *data);

/* 等待接口http返回 */
int32_t httpc_recv_response(httpc_handle_t httpc, uint8_t *rsp, uint32_t rsp_size,
                        http_rsp_info_t *info, uint32_t timeout);

完整源码
本示例应用的工程源码点击这里下载。
注意：需要更改app_main.c中的WIFI_SSID 和 WIFI_PASSWD 为你的路由器信息。
aos.mk：

NAME := httpclient_app

$(NAME)_MBINS_TYPE := app
$(NAME)_VERSION := 1.0.0
$(NAME)_SUMMARY := httpclient_app

$(NAME)_SOURCES += app_main.c

GLOBAL_DEFINES += BUILD_AOS

GLOBAL_INCLUDES += ./

$(NAME)_COMPONENTS_CUSTOMIZED := http yloop
$(NAME)_COMPONENTS += $($(NAME)_COMPONENTS_CUSTOMIZED)

app_main.c：

/*
* Copyright (C) 2015-2017 Alibaba Group Holding Limited
*/

#include

#include
#include
#include
#include

#define WIFI_SSID "aiot"
#define WIFI_PASSWD "12345678"

#define REQ_BUF_SIZE 2048
#define RSP_BUF_SIZE 4096
#define HTTP_UP_HDR_SIZE 128

/* weather api hostname */
#define WEATHER_HOSTNAME "http://www.weather.com.cn/"
/* weather api uri */
#define WEATHER_URI "data/sk/101210101.html"

static httpc_handle_t httpc_handle = 0;
static httpc_connection_t settings;

/* buffer for send & receive */
static uint8_t rsp_buf[RSP_BUF_SIZE] = {0};
static uint8_t req_buf[REQ_BUF_SIZE] = {0};

/* send http get request */
char *get_weather(void)
{
int fd;
char hdr[HTTP_UP_HDR_SIZE] = {0};
int32_t ret;
http_rsp_info_t rsp_info;

http_client_initialize();

/* create socket */
if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
      printf("alloc socket fd failn");
      goto exit;
}
memset(&settings, 0, sizeof(settings));
settings.socket    = fd;
settings.server_name  = WEATHER_HOSTNAME;
settings.req_buf    = req_buf;
settings.req_buf_size = REQ_BUF_SIZE;

/* httpc initialization */
if ((httpc_handle = httpc_init(&settings)) == 0) {
      printf("http session init failn");
      close(fd);
      goto exit;
}

/* construct httc header: set accept content type */
if ((httpc_construct_header(
         hdr, HTTP_UP_HDR_SIZE, "Accept",
         "text/xml,text/javascript,text/html,application/json")) < 0) {
      printf("http construct header failn");
      goto exit;
}

/* send get request */
if ((httpc_send_request(httpc_handle, HTTP_GET, WEATHER_URI, hdr,
                        "application/json", NULL, 0)) != HTTP_SUCCESS) {
      printf("httpc_send_request failn");
      goto exit;
}

/* get response */
if ((httpc_recv_response(httpc_handle, rsp_buf, RSP_BUF_SIZE, &rsp_info,
                           10000)) < 0) {
      printf("httpc_recv_response failn");
      goto exit;
}

printf("http session %x, buf size %d bytes, recv %d bytes data", httpc_handle,
      RSP_BUF_SIZE, rsp_info.rsp_len);
// if (rsp_info.rsp_len > 0) {
//    printf("%s", rsp_buf);
// }

if (rsp_info.message_complete) {
      // printf("message_complete");
      close(settings.socket);
      httpc_deinit(httpc_handle);
      return rsp_info.body_start;
}

exit:
close(settings.socket);
httpc_deinit(httpc_handle);
return NULL;
}

/* task for get weather */
static void get_weather_task(void *arg)
{
char *weather_data = NULL;

/* get weather data */
if((weather_data = get_weather()) != NULL){
      aos_msleep(200);
      printf("********************** weather data **********************rn");
      printf("%srn", weather_data);
      printf("**********************************************************rn");
      return;
}

printf("weather request errorrn");
}

/* wifi event */
static void wifi_service_event(input_event_t *event, void *priv_data)
{
static char ip[16] = {0};
static int get_weather_started = 0;

if (event->type != EV_WIFI && event->code != CODE_WIFI_ON_GOT_IP) {
      return;
}

netmgr_wifi_get_ip(ip);

/* start up only once */
if (get_weather_started == 1) {
      return;
}

/* check if ip is available */
if (0 == strcmp(ip, "0.0.0.0")) {
      printf("ip invailablen");
      return;
}
get_weather_started = 1;
printf("wifi connected, ip:%sn", ip);

aos_task_new("get_weather", get_weather_task, NULL, 1024 * 4);
}

/* task for connect wifi */
static void wifi_connect(void *arg)
{
/* network init */
netmgr_init();
netmgr_start(false);
aos_msleep(100);

/* connect to wifi */
printf("rnConnecting to wifi: ssid:[%s], passwd:[%s]rn", WIFI_SSID, WIFI_PASSWD);
netmgr_connect(WIFI_SSID, WIFI_PASSWD, 10 * 1000);
}
/**********************user code*************************/
int application_start(int argc, char *argv[])
{
#ifdef WITH_SAL
sal_add_dev(NULL, NULL);
sal_init();
#endif

/* register wifi event */
aos_register_event_filter(EV_WIFI, wifi_service_event, NULL);

aos_task_new("wifi_connect", wifi_connect, NULL, 2048);

/* loop for schedule */
aos_loop_run();
}

编译运行
点击编译和烧录。运行后，在串口日志最后面就能看的获取到的天气信息。
运行效果：

[ 0.050]AOS sensor:  drv_acc_st_lsm6dsl_init successfully

[ 0.060]AOS sensor:  drv_gyro_st_lsm6dsl_init gyro do not need reset

[ 0.070]AOS sensor:  drv_gyro_st_lsm6dsl_init successfully

[ 0.080]AOS sensor:  drv_als_liteon_ltr553_init successfully

[ 0.090]AOS sensor:  drv_ps_liteon_ltr553_init successfully

[ 0.100]AOS sensor:  drv_baro_bosch_bmp280_init successfully

[ 0.110]AOS sensor:  drv_mag_memsic_mmc3680kj_init successfully

[ 0.120]AOS sensor:  drv_humi_sensirion_shtc1_init successfully

[ 0.130]AOS sensor:  drv_temp_sensirion_shtc1_init successfully

         Welcome to AliOS Things
[ 0.150]sal_wifi Uart dev is not configured, use the default cfg

uart 1 enter uart_receive_start_dma instance 0x40004800ip invailable

Connecting to wifi: ssid:[aiot], passwd:[12345678]
wifi connected, ip:192.168.43.111
[[hhttttppcc]][[000088665500]]  hhttttppcc__sseenndd__rreeqquueesstt,,  sseenndd  rreeqquueesstt  hheeaaddeerr

vGoErTk s/pdaactea//gsikt/h1u0b1/2A1l0i1O0S1-.Thhtimnlg sH/TbToPa/r1d./1d
2Ulsoepre-rAkgietn/ta:o sA/lbioOaSr-dH_TcTlPi-.Ccl i2e1n6t
1

Cache-Control: no-cache
Connection: close
Host: www.weather.com.cn
Accept: text/xml,text/javascript,text/html,application/json
Content-Type: application/json

socket 0, len 238
[httpc][009130] httpc_send_request, connect 0
[httpc][009160] httpc_send_request, send 238, ret 0
[httpc][019170] on_message_begin, HTTP response (headers), method GET
[httpc][019170] on_status, HTTP response status OK
[httpc][019180] print_header_field, len 4, Date
[httpc][019190] print_header_field, len 29, Wed, 09 Oct 2019 07:32:13 GMT
[httpc][019200] print_header_field, len 12, Content-Type
[httpc][019200] print_header_field, len 9, text/html
[httpc][019210] print_header_field, len 17, Transfer-Encoding
[httpc][019220] print_header_field, len 7, chunked
[httpc][019220] print_header_field, len 10, Connection
[httpc][019230] print_header_field, len 5, close
[httpc][019240] print_header_field, len 6, Server
[httpc][019240] print_header_field, len 9, openresty
[httpc][019250] print_header_field, len 16, X-Xss-Protection
[httpc][019260] print_header_field, len 1, 1
[httpc][019260] print_header_field, len 10, Set-Cookie
[httpc][019270] print_header_field, len 8, HttpOnly
[httpc][019280] print_header_field, len 3, Age
[httpc][019280] print_header_field, len 4, 2068
[httpc][019290] print_header_field, len 5, X-Via
[httpc][019300] print_header_field, len 125, 1.1 PSbjsdBGPvu28:10 (Cdn Cache Server V2.0), 1.1 zhdx147:10 (Cdn Cache Server V2.0), 1.1 huadxin69:7 (Cdn Cache Server V2.0)
[httpc][019320] on_headers_complete, headers complete
[httpc][019320] on_message_complete, HTTP GET response (complete)
http session 20002298, buf size 4096 bytes, recv 578 bytes data[  19.340]sal_wifi HAL_SAL_Close 778 failed
********************** weather data **********************
{"weatherinfo":{"city":"杭州","cityid":"101210101","temp":"24.8","WD":"东北风","WS":"小于3级","SD":"81%","AP":"1000.3hPa","njd":"暂无实况","WSE":"<3","time":"17:50","sm":"2.1","isRadar":"1","Radar":"JC_RADAR_AZ9571_JB"}}

**********************************************************