基于Asio实现一个简易的httpclient
Asio是C++的一个高性能网络编程
库,提供了跨平台的网络和底层I/O编程
接口,包括tcp,udp等sockets通信,以及异步编程模型
。它的设计目标是为C++开发者提供一种简单、直接的方式来处理网络通信和并行I/O操作,同时保持高效和灵活性。
知识点
- 使用
asio::io_context ioctx;
作为整个网络IO和回调的上下文 - 使用
std::thread processor;
作为ioctx的执行线程,只需要在线程函数里执行ioctx.run()即可触发io事件循环工作 - 使用
asio::executor_work_guard<asio::io_context::executor_type> work;
保证ioctx不会因为没有执行任务而结束,导致线程退出 - 使用
asio::ip::tcp::resolver resolver_;
进行dns域名解析 - 使用
std::promise/std::future
进行异步任务同步等待,类似于javascript的async/await
源码
https://github.com/samxfb/cpp-httpclient
编译输出cpp-httpclient
Usage:
./cpp-httpclient [ip] [port] [method:GET/POST...] [url/path]
./cpp-httpclient --host [host] [method:GET/POST...] [url/path]
测试用例
1、借助在线的http服务(https://httpbin.org/)
./cpp-httpclient --host httpbin.org GET /get
connect httpbin.org [ip 184.73.216.86, port 80]
RESULT: HTTP/1.1 200 OK
response message:
{
"args": {},
"headers": {
"Accept": "*/*",
"Host": "httpbin.org",
"X-Amzn-Trace-Id": "Root=1-65ab4f91-7370ba8a2d5dee213fb955d6"
},
"origin": "218.108.104.131",
"url": "http://httpbin.org/get"
}
2、自己搭建一个简易的静态http服务器
- 基于apache搭建
- 使用python自带的http.server模块
python3 -m http.server 9000, 端口号为9000
- 基于Node.js的轻量级静态HTTP服务器http-server
安装:npm install -g http-server
运行:http-server --port 9000
以下测试启动node.js http-server进行:
(base) sam@SamdeMacBook-Pro:~/Desktop/test/cpp-httpclient$ http-server --port 9000
Starting up http-server, serving ./
http-server version: 14.1.1
http-server settings:
CORS: disabled
Cache: 3600 seconds
Connection Timeout: 120 seconds
Directory Listings: visible
AutoIndex: visible
Serve GZIP Files: false
Serve Brotli Files: false
Default File Extension: none
Available on:
http://127.0.0.1:9000
http://10.18.146.230:9000
Hit CTRL-C to stop the server
http客户端请求
./cpp-httpclient 127.0.0.1 9000 GET /build.sh
RESULT: HTTP/1.1 200 OK
response message:
#!/bin/bash
g++ -std=c++11 -I. -I./thirdparty/asio/asio/include -pthread -o cpp-httpclient test.cpp