Gwill / cinatra

modern c++(c++17), cross-platform, header-only, easy to use http framework

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cinatra--一个高效易用的c++ http框架

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目录

使用cinatra常见问题汇总(FAQ)

cinatra简介

cinatra是一个高性能易用的http框架,它是用modern c++(c++17)开发的,它的目标是提供一个快速开发的c++ http框架。它的主要特点如下:

  1. 统一而简单的接口
  2. header-only
  3. 跨平台
  4. 高效
  5. 支持面向切面编程

cinatra目前支持了http1.1/1.0, ssl和websocket, 你可以用它轻易地开发一个http服务器,比如常见的数据库访问服务器、文件上传下载服务器、实时消息推送服务器,你也可以基于cinatra开发一个mqtt服务器。 cinatra是世界上性能最好的http服务器之一,性能测试详见性能测试

谁在用cinatra

cinatra目前被很多公司在使用,在这里可以看到谁在用cinatra.

如何使用

编译依赖

cinatra是基于boost.asio开发的,所以需要boost库。不过,cinatra同时也支持了ASIO_STANDALONE,你不必一定需要boost库。

cinatra需要的依赖项:

  1. C++17 编译器 (gcc 7.2, clang 4.0, Visual Studio 2017 update 15.5,或者更高的版本)
  2. Boost.Asio(或者独立的 Asio)
  3. Boost.System

使用

cinatra是header-only的,直接引用头文件既可。

快速示例

示例1:一个简单的hello world

#include "cinatra.hpp"
using namespace cinatra;

int main() {
	int max_thread_num = std::thread::hardware_concurrency();
	http_server server(max_thread_num);
	server.listen("0.0.0.0", "8080");
	server.set_http_handler<GET, POST>("/", [](request& req, response& res) {
		res.set_status_and_content(status_type::ok, "hello world");
	});

	server.run();
	return 0;
}

5行代码就可以实现一个简单http服务器了,用户不需要关注多少细节,直接写业务逻辑就行了。

示例2:展示如何取header和query以及错误返回

#include "cinatra.hpp"
using namespace cinatra;

int main() {
	http_server server(std::thread::hardware_concurrency());
	server.listen("0.0.0.0", "8080");
	server.set_http_handler<GET, POST>("/test", [](request& req, response& res) {
		auto name = req.get_header_value("name");
		if (name.empty()) {
			res.set_status_and_content(status_type::bad_request, "no name");
			return;
		}

		auto id = req.get_query_value("id");
		if (id.empty()) {
			res.set_status_and_content(status_type::bad_request);
			return;
		}

		res.set_status_and_content(status_type::ok, "hello world");
	});

	server.run();
	return 0;
}

示例3:面向切面的http服务器

#include "cinatra.hpp"
using namespace cinatra;

//日志切面
struct log_t
{
	bool before(request& req, response& res) {
		std::cout << "before log" << std::endl;
		return true;
	}

	bool after(request& req, response& res) {
		std::cout << "after log" << std::endl;
		return true;
	}
};

//校验的切面
struct check {
	bool before(request& req, response& res) {
		std::cout << "before check" << std::endl;
		if (req.get_header_value("name").empty()) {
			res.set_status_and_content(status_type::bad_request);
			return false;
		}
		return true;
	}

	bool after(request& req, response& res) {
		std::cout << "after check" << std::endl;
		return true;
	}
};

//将信息从中间件传输到处理程序
struct get_data {
	bool before(request& req, response& res) {
		req.set_aspect_data("hello", std::string("hello world"));
		return true;
	}
}

int main() {
	http_server server(std::thread::hardware_concurrency());
	server.listen("0.0.0.0", "8080");
	server.set_http_handler<GET, POST>("/aspect", [](request& req, response& res) {
		res.set_status_and_content(status_type::ok, "hello world");
	}, check{}, log_t{});

	server.set_http_handler<GET,POST>("/aspect/data", [](request& req, response& res) {
		std::string hello = req.get_aspect_data<std::string>("hello");
		res.set_status_and_content(status_type::ok, std::move(hello));
	}, get_data{});

	server.run();
	return 0;
}

本例中有两个切面,一个校验http请求的切面,一个是日志切面,这个切面用户可以根据需求任意增加。本例会先检查http请求的合法性,如果不合法就会返回bad request,合法就会进入下一个切面,即日志切面,日志切面会打印出一个before表示进入业务逻辑之前的处理,业务逻辑完成之后会打印after表示业务逻辑结束之后的处理。

示例4:文件上传

cinatra目前支持了multipart和octet-stream格式的上传。

multipart文件上传

#include <atomic>
#include "cinatra.hpp"
using namespace cinatra;

int main() {
	http_server server(std::thread::hardware_concurrency());
	server.listen("0.0.0.0", "8080");

	//http upload(multipart)
	server.set_http_handler<GET, POST>("/upload_multipart", [](request& req, response& res) {
		assert(req.get_content_type() == content_type::multipart);
		
		auto& files = req.get_upload_files();
		for (auto& file : files) {
			std::cout << file.get_file_path() << " " << file.get_file_size() << std::endl;
		}

		res.set_status_and_content(status_type::ok, "multipart finished");
	});

	server.run();
	return 0;
}

短短几行代码就可以实现一个http文件上传的服务器了,包含了异常处理和错误处理。

octet-stream文件上传

#include <atomic>
#include "cinatra.hpp"
using namespace cinatra;

int main() {
	http_server server(std::thread::hardware_concurrency());
	server.listen("0.0.0.0", "8080");

	//http upload(octet-stream)
	server.set_http_handler<GET, POST>("/upload_octet_stream", [](request& req, response& res) {
		assert(req.get_content_type() == content_type::octet_stream);
		auto& files = req.get_upload_files();
		for (auto& file : files) {
			std::cout << file.get_file_path() << " " << file.get_file_size() << std::endl;
		}

		res.set_status_and_content(status_type::ok, "octet-stream finished");
	});

	server.run();
	return 0;
}

示例5:文件下载

cinatra提供下载功能非常简单,不需要编写代码,具体方法:
1. 启动cinatra server
2. 将要下载的文件放到http server同一级的www目录下即可。
3. 如何下载:如果你把test.txt放到www之后,那么直接通过http://127.0.0.1:8090/test.txt下载即可。
//chunked download
//cinatra will send you the file, if the file is big file(more than 5M) the file will be downloaded by chunked. support continues download

示例6:websocket

#include "cinatra.hpp"
using namespace cinatra;

int main() {
	http_server server(std::thread::hardware_concurrency());
	server.listen("0.0.0.0", "8080");

	//web socket
	server.set_http_handler<GET, POST>("/ws", [](request& req, response& res) {
		assert(req.get_content_type() == content_type::websocket);

		req.on(ws_open, [](request& req){
			std::cout << "websocket start" << std::endl;
		});

		req.on(ws_message, [](request& req) {
			auto part_data = req.get_part_data();
			//echo
			std::string str = std::string(part_data.data(), part_data.length());
			req.get_conn<cinatra::NonSSL>()->send_ws_string(std::move(str));
			std::cout << part_data.data() << std::endl;
		});

		req.on(ws_error, [](request& req) {
			std::cout << "websocket pack error or network error" << std::endl;
		});
	});

	server.run();
	return 0;
}

示例7:io_service_inplace

本代码演示如何使用io_service_inplace,然后自己控制http server的运行线程以及循环。 使用 [http://[::1]:8080/close] (IPv6) 或者 [http://127.0.0.1:8080/close] (IPv4) 来关闭http server。

#include "cinatra.hpp"
using namespace cinatra;

int main() {

	bool is_running = true;
	http_server_<io_service_inplace> server;
	server.listen("8080");

	server.set_http_handler<GET, POST>("/", [](request& req, response& res) {
		res.set_status_and_content(status_type::ok, "hello world");
	});

	server.set_http_handler<GET, POST>("/close", [&](request& req, response& res) {
		res.set_status_and_content(status_type::ok, "will close");

		is_running = false;
		server.stop();
	});

	while(is_running)
		server.poll_one();

	return 0;
}

cinatra客户端使用

同步发get/post消息

同步和异步发送接口都是返回response_data,它有4个字段分别是:网络错误码、http状态码、返回的消息、返回的header。

void print(const response_data& result) {
    print(result.ec, result.status, result.resp_body, result.resp_headers.second);
}

void test_sync_client() {
    auto client = cinatra::client_factory::instance().new_client();
    std::string uri = "http://www.baidu.com";
    std::string uri1 = "http://cn.bing.com";
    std::string uri2 = "https://www.baidu.com";
    std::string uri3 = "https://cn.bing.com";
    
    response_data result = client->get(uri);
    print(result);

    response_data result1 = client->get(uri1);
    print(result1);

    print(client->post(uri, "hello"));
    print(client->post(uri1, "hello"));

#ifdef CINATRA_ENABLE_SSL
    response_data result2 = client->get(uri2);
    print(result2);

    response_data result3 = client->get(uri3);
    print(result3);

    response_data result4 = client->get(uri3);
    print(result4);

    response_data result5 = client->get(uri2);
    print(result5);
#endif
}

异步发get/post消息

void test_async_client() {
    
    std::string uri = "http://www.baidu.com";
    std::string uri1 = "http://cn.bing.com";
    std::string uri2 = "https://www.baidu.com";
    std::string uri3 = "https://cn.bing.com";

    {
        auto client = cinatra::client_factory::instance().new_client();
        client->async_get(uri, [](response_data data) {
            print(data);
        });
    }
    
    {
        auto client = cinatra::client_factory::instance().new_client();
        client->async_get(uri1, [](response_data data) {
            print(data);
        });
    }

    {
        auto client = cinatra::client_factory::instance().new_client();
        client->async_post(uri, "hello", [](response_data data) {
            print(data);
        });
    }

#ifdef CINATRA_ENABLE_SSL
    {
        auto client = cinatra::client_factory::instance().new_client();
        client->async_get(uri2, [](response_data data) {
            print(data);
        });
    }

    {
        auto client = cinatra::client_factory::instance().new_client();
        client->async_get(uri3, [](response_data data) {
            print(data);
        });
    }
#endif
}

文件上传

异步multipart文件上传。

void test_upload() {
    std::string uri = "http://cn.bing.com/";
    auto client = cinatra::client_factory::instance().new_client();
    client->upload(uri, "boost_1_72_0.7z", [](response_data data) {
        if (data.ec) {
            std::cout << data.ec.message() << "\n";
            return;
        }

        std::cout << data.resp_body << "\n"; //finished upload
    });
}

文件下载

提供了两个异步chunked下载接口,一个是直接下载到文件,一个是chunk回调给用户,由用户自己去处理下载的chunk数据

void test_download() {
    std::string uri = "http://www.httpwatch.com/httpgallery/chunked/chunkedimage.aspx";

    {
        auto client = cinatra::client_factory::instance().new_client();
        client->download(uri, "test.jpg", [](response_data data) {
            if (data.ec) {
                std::cout << data.ec.message() << "\n";
                return;
            }

            std::cout << "finished download\n";
        });
    }

    {
        auto client = cinatra::client_factory::instance().new_client();
        client->download(uri, [](auto ec, auto data) {
            if (ec) {
                std::cout << ec.message() << "\n";
                return;
            }

            if (data.empty()) {
                std::cout << "finished all \n";
            }
            else {
                std::cout << data.size() << "\n";
            }
        });
    }
}

性能测试

测试用例:

qps

qps-pipeline

注意事项

websocket的业务函数是会多次进入的,因此写业务逻辑的时候需要注意,推荐按照示例中的方式去做。

联系方式

purecpp@163.com

qq群:340713904

http://purecpp.org/

https://github.com/qicosmos/cinatra

About

modern c++(c++17), cross-platform, header-only, easy to use http framework

License:MIT License


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