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@ -1,338 +1,95 @@
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# WebClient介绍 #
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# WebClient
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本章节是webclient的使用和API说明，描述了如何使用webclient与WEB Server通信。
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## 1、介绍
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WebClient 软件包是 RT_Thread 自主研发的，基于 HTTP 协议的客户端的实现，它提供设备与 HTTP Server 的通讯的基本功能。
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### webclient设计简介 ###
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WebClient 软件包功能特点如下：
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webclient是**HTTP**协议的客户端工具，提供与WEB Server通信的基本功能。
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- 支持 IPV4/IPV6 地址；
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一般而言，设备端运行RT-Thread开源实时系统，并使用webclient提供的API与 HTTP 服务器交互。
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- 支持 GET/POST 命令；
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- 支持文件的上传和下载功能；
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- 支持 HTTPS 加密传输；
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- 完善的头部数据添加和处理方式。
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### webclient会话结构体定义 ###
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更多软件包介绍请查看 [详细介绍](docs/introduction.md)。
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webclient底层操作接口都使用了统一的webclient客户端会话: `struct webclient_session`，它被定义成:
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### 1.1 目录结构
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``` C
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WebClient 软件包目录结构如下所示：
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struct webclient_session
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{
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/* the session socket */
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int socket;
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/* the response code of HTTP request */
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int response;
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/* transfer encoding */
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char *transfer_encoding;
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int chunk_sz;
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int chunk_offset;
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/* content_type of HTTP response */
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char *content_type;
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/* content_length of HTTP response */
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int content_length;
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/* last modified timestamp of resource */
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char *last_modified;
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/* location */
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char *location;
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/* server host */
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char *host;
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/* HTTP request */
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char *request;
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/* private for webclient session. */
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/* position of reading */
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unsigned int position;
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/* remainder of content reading */
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size_t content_length_remainder;
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};
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```
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```
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webclient
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其中当服务端有回应时:
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├───docs
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│ └───figures // 文档使用图片
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* response：会存储服务端的相应代码，如果成功，服务端回复:200；详细描述请参考 HTTP 状态码表。
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│ │ api.md // API 使用说明
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* content_type：服务端提供的内容类型。
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│ │ introduction.md // 介绍文档
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* content_length：服务端返回的数据长度。
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│ │ principle.md // 实现原理
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│ │ README.md // 文档结构说明
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│ │ samples.md // 软件包示例
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│ │ user-guide.md // 使用说明
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## webclient API说明 ##
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│ └───version.md // 版本
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├───inc // 头文件
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├───src // 源文件
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### webclient会话接口 ###
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├───samples // 示例代码
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| | webclient_get_sample // GET 请求示例代码
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│ └───webclient_post_sample // POST 请求示例代码
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webclient底层接口定义了面向http这层的公共访问接口（流方式接口），可以基于这层接口进行底层的http操作。
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│ LICENSE // 软件包许可证
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│ README.md // 软件包使用说明
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└───SConscript // RT-Thread 默认的构建脚本
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#### webclient_open ####
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``` C
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struct webclient_session* webclient_open(const char* URI);
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```
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```
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* 功能: 打开一个webclient客户端
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### 1.2 许可证
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* 参数1: URI 指向相应的网址，可以包括域名，特殊的端口号等。例如:
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`URI = "http://www.test.com:8080/index.html"`
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* 返回值: 成功返回一个webclient客户端会话；失败返回RT_NULL
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webclient_open用于打开一个webclient会话，默认方法为get。
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WebClient 软件包遵循 LGPLv2.1 许可，详见 LICENSE 文件。
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返回时，客户端就已经解析了http返回头部，里面有status_code及resp_len。
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根据这些信息可以做进一步处理，如使用webclient_read读取服务器返回的数据。
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### 1.3 依赖
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#### webclient_open_header ####
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- RT_Thread 3.0+
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``` C
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- [mbedtls 软件包](https://github.com/RT-Thread-packages/mbedtls)（如果开启 HTTPS 支持）
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struct webclient_session*
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webclient_open_header(const char* URI, int method,
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const char* header, size_t header_sz);
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```
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* 功能: 在打开会话时可以加入一些自定义的HTTP请求头信息
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## 2、获取软件包
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* 参数1: URI，指向相应的网址，可以包括域名，特殊的端口号等。例如:
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`URI = "http://www.test.com:8080/index.html"`
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使用 WebClient 软件包需要在 RT-Thread 的包管理中选中它，具体路径如下：
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* 参数2: method，定义了打开URI的方法，当前支持GET（WEBCLIENT_GET）或POST（WEBCLIENT_POST)
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* 参数3: header信息，例如:
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``` C
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"Host: www.host.com\r\n"
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"User-Agent: YourAgent\r\n"
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"Content-Type: application/x-www-form-urlencoded\r\n"
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```
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```
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RT-Thread online packages
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header信息中必须使用"CR+LF"(回车+换行)作为分隔符和结束符。
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IoT - internet of things --->
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header中每项应该符合HTTP的协议标准。
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[*] WebClient: A HTTP/HTTPS Client for RT-Thread
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而一些基本的信息，例如Host，HTTP/1.0等信息，如果header中不存在，webclient会自动添加。
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[ ] Enable support tls protocol
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[ ] Enable webclient GET/POST samples
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* 返回值: 成功返回一个webclient客户端会话；失败返回RT_NULL
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Version (latest) --->
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webclient_open_header用于打开一个webclient会话，method由用户指定。
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相比webclient_open接口，webclient_open_header可以自定义请求的header。
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#### webclient_close ####
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``` C
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int webclient_close(struct webclient_session* session);
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```
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```
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* 功能: 关闭一个webclient客户端
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**Enable support tls protocol** ：开启 HTTPS 支持；
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* 参数1: session指向要关闭的webclient客户端会话
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* 返回值: 0
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webclient_close用于关闭webclient一个会话。
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**Enable webclient GET/POST samples** ：添加示例代码；
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**Version** ：配置软件包版本。
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配置完成后让 RT-Thread 的包管理器自动更新，或者使用 pkgs --update 命令更新包到 BSP 中。
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## 3、使用 WebClient 软件包
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- 软件包详细介绍，请参考 [软件包介绍](docs/introduction.md)
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### webclient数据接口 ###
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- 如何从零开始使用，请参考 [用户手册](docs/user-guide.md)
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- 完整的 API 文档，请参考 [API 手册](docs/api.md)
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#### webclient_read ####
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- 详细的示例介绍，请参考 [示例文档](docs/samples.md)
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- 软件包工作原理，请参考 [工作原理](docs/principle.md)
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``` C
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- 更多**详细介绍文档**位于 [`/docs`](/docs) 文件夹下，**使用软件包进行开发前请务必查看**。
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int webclient_read (struct webclient_session* session,
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unsigned char *buffer, size_t size);
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```
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* 功能: 从http连接中读取一段数据（非服务端响应的http header）
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* 参数1: session，一个webclient客户端会话
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* 参数2: buffer，保存从http连接中读取的数据的缓冲区
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* 参数3: size，每次读取的最大数据
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* 返回值: 成功返回读到的数据长度；失败返回负数
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webclient_read从webclient会话中读取数据。
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## 4、注意事项
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#### webclient_write ####
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``` C
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int webclient_write(struct webclient_session* session,
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const unsigned char *buffer, size_t size);
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```
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* 功能: 向http连接发送一段数据
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- WebClient 软件包连接 HTTPS 服务器时需要开启 WebClient 中对 TLS 功能的支持。
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* 参数1: session，一个webclient客户端会话
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- WebClient 软件包版本更新（`V1.0.0 -> V2.0.0`）后软件包中函数接口和使用流程都有所变化，若开发者代码中使用之前接口，可以适配最新版本接口，或者在版本号配置中选择 `V1.0.0` 版本。
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* 参数2: buffer，要发送的数据的缓冲区
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* 参数3: size，要发送的数据的长度
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* 返回值: 成功发送的数据长度
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webclient_write向webclient会话写入数据。
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### webclient应用接口 ###
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## 5、联系方式 & 感谢
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#### webclient传输数据 ####
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``` C
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int webclient_transfer(const char* URI, const char* header,
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size_t header_sz,
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const char* data, size_t data_sz,
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char *result, size_t result_sz);
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```
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* 功能: 向指定的URI传递数据data（同时也设置附加的HTTP请求头部信息为header)，并读取结果到result缓冲区中。函数返回读取到的数据长度。
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* 参数1: URI，指向相应的网址，可以包括域名，特殊的端口号等。
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* 参数2: header信息。
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* 参数4: header信息的长度。
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* 参数4: data，要发送的数据
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* 参数5: size，要发送的数据的长度
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* 参数6: result，用于保存从服务器接收到的数据缓冲区，当不需要保存时，可以为空。
|
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|
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* 参数7: result_sz，用于保存从服务器接收到的数据缓冲区长度。
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* 返回值: 成功发送的数据长度
|
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> 注：webclient_transfer会自动创建一个session，并在传输完成后关闭session。
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#### webclient文件下载 ####
|
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|
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|
|
|
``` C
|
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|
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int webclient_get_file(const char* URI, const char* filename);
|
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```
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|
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|
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这个函数用于从URI下载一个文件，并保存到filename指定的路径上。保存的文件仅包括服务端提供的文件，而不包括HTTP响应的头部信息。例如下面的例子:
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``` C
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|
|
/*
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* 服务端的文件test.txt，放于webroot目录下(web路径的根目录下)，其内容是:
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* "this is a test.\n"
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*/
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|
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void test(void)
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{
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|
/* 下载test.txt文件 */
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webclient_get_file("http://www.test.com/test.txt", "/test.txt");
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}
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/*
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* 保存在本地根目录的test.txt文件的内容是:
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* "this is a test.\n"
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*/
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```
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|
#### webclient文件上传 ####
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|
|
``` C
|
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|
|
int webclient_post_file(const char* URI,
|
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|
|
const char* filename,
|
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|
|
const char* form_data);
|
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|
|
```
|
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|
|
这个函数用于从filename路径的文件中读取数据，并向URI以POST方法发送这个文件的
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|
|
内容；
|
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|
|
例如用于上传的form是:
|
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|
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|
|
|
|
|
|
|
``` C
|
|
|
|
|
|
|
|
<form action="uploader.php" method="post" enctype="multipart/form-data">
|
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|
|
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|
|
<label for="file">Filename:</label>
|
|
|
|
|
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|
|
<input type="file" name="file" id="file" />
|
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|
|
<br />
|
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|
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|
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|
|
<input type="submit" name="submit" value="Submit" />
|
|
|
|
|
|
|
|
</form>
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
参数form_data可以填充服务端关心的类型信息，例如:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
``` C
|
|
|
|
|
|
|
|
"name=\"file\"; filename=\"test.txt\""
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
这样，服务端可以得到filename的值是“test.txt”。
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
## webclient测试及示例程序 ##
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
下面的例子是一个使用webclient底层接口的例子
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
``` C
|
|
|
|
|
|
|
|
#include <http_client.h>
|
|
|
|
|
|
|
|
#include <dfs_posix.h>
|
|
|
|
|
|
|
|
#define BUF_SZ 4096
|
|
|
|
|
|
|
|
void webclient_test(void)
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
int fd = -1;
|
|
|
|
|
|
|
|
int offset;
|
|
|
|
|
|
|
|
rt_uint8_t* ptr = RT_NULL;
|
|
|
|
|
|
|
|
struct webclient_session* session = RT_NULL; /* webclient客户端会话 */
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
session = webclient_open("http://www.test.com/index.html");
|
|
|
|
|
|
|
|
if (session == RT_NULL)
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
rt_kprintf("open website failed.\n");
|
|
|
|
|
|
|
|
goto __exit;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (session->response != 200)
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
/* 服务端给出错误的响应 */
|
|
|
|
|
|
|
|
rt_kprintf("wrong response: %d\n", session->response);
|
|
|
|
|
|
|
|
goto __exit;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (strcmp(session->content_type, "text/html") != 0)
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
/* 不是自己关心的内容类别，退出 */
|
|
|
|
|
|
|
|
rt_kprintf("context_type: %d\n", session->content_type);
|
|
|
|
|
|
|
|
goto __exit;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
fd = open("/index.html", O_WRONLY | O_CREAT, 0);
|
|
|
|
|
|
|
|
if (fd < 0)
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
/* 创建文件出错，返回 */
|
|
|
|
|
|
|
|
rt_kprintf("open file failed\n");
|
|
|
|
|
|
|
|
goto __exit;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* 分配需要的缓冲 */
|
|
|
|
|
|
|
|
ptr = rt_malloc (BUF_SZ);
|
|
|
|
|
|
|
|
if (ptr == RT_NULL)
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
rt_kprintf("out of memory\n");
|
|
|
|
|
|
|
|
goto __exit;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if (session->content_length == 0)
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
/* 如果服务端未给出数据内容长度，读取数据直到服务端关闭连接 */
|
|
|
|
|
|
|
|
while (1)
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
length = webclient_read(session, ptr, BUF_SZ);
|
|
|
|
|
|
|
|
if (length > 0) write(fd, ptr, length);
|
|
|
|
|
|
|
|
else break;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
else
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
for (offset = 0; offset < session->content_length; )
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
/* 从连接读取数据 */
|
|
|
|
|
|
|
|
length = webclient_read(session, ptr,
|
|
|
|
|
|
|
|
session->content_length - offset > BUF_SZ?
|
|
|
|
|
|
|
|
BUF_SZ:session->content_length - offset);
|
|
|
|
|
|
|
|
/* 写入到文件中 */
|
|
|
|
|
|
|
|
if (length > 0) write(fd, ptr, length);
|
|
|
|
|
|
|
|
else break;
|
|
|
|
|
|
|
|
/* 挪动偏移位置 */
|
|
|
|
|
|
|
|
offset += length;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
__exit: /* 退出出口 */
|
|
|
|
|
|
|
|
if (session != RT_NULL) webclient_close(session);
|
|
|
|
|
|
|
|
if (fd >= 0) close(fd);
|
|
|
|
|
|
|
|
if (ptr != RT_NULL) rt_free(ptr);
|
|
|
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
- 维护：RT-Thread 开发团队
|
|
|
|
|
|
|
|
- 主页：https://github.com/RT-Thread-packages/webclient
|
chenyong
7 years ago