boost库http服务器

boost库http服务器

基于boost标准C++库,使用协程和beast实现http服务器,仅添加支持post和get方法。

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

namespace beast = boost::beast;         // from 
namespace http = beast::http;           // from 
namespace net = boost::asio;            // from 
using tcp = boost::asio::ip::tcp;       // from 
using namespace std;

typedef std::string (*pgetfunc)(void);
typedef std::string (*ppostfunc)(const std::string);
/******************************************* get ************************************************/
std::string print_cc(void)
{
	std::cout << "======== c c ========" << std::endl;
	return std::string("print_cc");
}

std::string print_dd(void)
{
	std::cout << "======== d d ========" << std::endl;
	return std::string("print_dd");
}


std::map get_supported = {
	{"/aa/bb/cc", print_cc},
	{"/aa/bb/dd", print_dd},
};

/******************************************** post *********************************************/
std::string print_ee(std::string strJson)
{
	std::cout << "======== e e ========" << strJson << std::endl;
	return std::string("print_cc");
}

std::string print_ff(std::string strJson)
{
	std::cout << "======== f f ========" << strJson << std::endl;
	return std::string("print_dd");
}


std::map post_supported = {
	{"/aa/bb/ee", print_ee},
	{"/aa/bb/ff", print_ff},
};


//------------------------------------------------------------------------------
auto select_protocol = [](beast::string_view offered_tokens) -> std::string
{
    // tokenize the Sec-Websocket-Protocol header offered by the client
    http::token_list offered( offered_tokens );

    // an array of protocols supported by this server
    // in descending order of preference
    static const std::array
        supported = {
        "/aa/bb/cc",
        "/aa/bb/dd",
        "/aa/bb/ee",
		"/aa/bb/ff"
    };

    std::string result;
	auto iter = std::find(std::begin(supported), std::end(supported), offered_tokens);
	if (iter != std::end(supported)){
		result.assign(offered_tokens.begin(), offered_tokens.end());
	}

    return result;
};

// Return a reasonable mime type based on the extension of a file.
beast::string_view
mime_type(beast::string_view path)
{
    using beast::iequals;
    auto const ext = [&path]
    {
        auto const pos = path.rfind(".");
        if(pos == beast::string_view::npos)
            return beast::string_view{};
        return path.substr(pos);
    }();
    if(iequals(ext, ".htm"))  return "text/html";
    if(iequals(ext, ".html")) return "text/html";
    if(iequals(ext, ".php"))  return "text/html";
    if(iequals(ext, ".css"))  return "text/css";
    if(iequals(ext, ".txt"))  return "text/plain";
    if(iequals(ext, ".js"))   return "application/javascript";
    if(iequals(ext, ".json")) return "application/json";
    if(iequals(ext, ".xml"))  return "application/xml";
    if(iequals(ext, ".swf"))  return "application/x-shockwave-flash";
    if(iequals(ext, ".flv"))  return "video/x-flv";
    if(iequals(ext, ".png"))  return "image/png";
    if(iequals(ext, ".jpe"))  return "image/jpeg";
    if(iequals(ext, ".jpeg")) return "image/jpeg";
    if(iequals(ext, ".jpg"))  return "image/jpeg";
    if(iequals(ext, ".gif"))  return "image/gif";
    if(iequals(ext, ".bmp"))  return "image/bmp";
    if(iequals(ext, ".ico"))  return "image/vnd.microsoft.icon";
    if(iequals(ext, ".tiff")) return "image/tiff";
    if(iequals(ext, ".tif"))  return "image/tiff";
    if(iequals(ext, ".svg"))  return "image/svg+xml";
    if(iequals(ext, ".svgz")) return "image/svg+xml";
    return "application/text";
}

// This function produces an HTTP response for the given
// request. The type of the response object depends on the
// contents of the request, so the interface requires the
// caller to pass a generic lambda for receiving the response.
template<
    class Body, class Allocator,
    class Send>
void
handle_request(
    beast::string_view doc_root,
    http::request>&& req,
    Send&& send)
{
    // 返回正常请求响应
    auto const success_request =
    [&req](beast::string_view body)
    {
        http::response res{http::status::ok, req.version()};
        res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
        res.set(http::field::content_type, "text/html");
        res.keep_alive(req.keep_alive());
        res.body() = std::string(body);
        res.prepare_payload();
        return res;
    };
    // 返回错误请求响应
    auto const bad_request =
    [&req](beast::string_view why)
    {
        http::response res{http::status::bad_request, req.version()};
        res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
        res.set(http::field::content_type, "text/html");
        res.keep_alive(req.keep_alive());
        res.body() = std::string(why);
        res.prepare_payload();
        return res;
    };

    // 返回为查找到请求响应
    auto const not_found =
    [&req](beast::string_view method, beast::string_view target)
    {
        http::response res{http::status::not_found, req.version()};
        res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
        res.set(http::field::content_type, "text/html");
        res.keep_alive(req.keep_alive());
        res.body() = "The '" + std::string(method) + "' resource '" + std::string(target) + "' was not found.";
        res.prepare_payload();
        return res;
    };

    auto const server_error =
    [&req](beast::string_view what)
    {
        http::response res{http::status::internal_server_error, req.version()};
        res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
        res.set(http::field::content_type, "text/html");
        res.keep_alive(req.keep_alive());
        res.body() = "An error occurred: '" + std::string(what) + "'";
        res.prepare_payload();
        return res;
    };
    // 确保我们能处理这个方法
    if(req.method() != http::verb::get && req.method() != http::verb::head && req.method() != http::verb::post)
        return send(bad_request("Unknown HTTP-method"));
    // 请求路径必须是绝对路径且不包含 "..".
    if( req.target().empty() || req.target()[0] != '/' ||
        req.target().find("..") != beast::string_view::npos)
        return send(bad_request("Illegal request-target"));
	/****************************************************************************************************************/
    // 响应HEAD请求
    if(req.method() == http::verb::head) {
		auto const size = 0;
        http::response res{http::status::ok, req.version()};
        res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
        res.set(http::field::content_type, mime_type(path));
        res.content_length(size);
        res.keep_alive(req.keep_alive());
        return send(std::move(res));
    }
	/****************************************************************************************************************/
    // 响应GET请求
    if(req.method() == http::verb::get){
		std::string protocol = select_protocol(req.target());
		
		if(get_supported.count(protocol) >0 ) {
			std::string body = get_supported[protocol]();
			return send(success_request(body));
		} else {
			return send(not_found(req.method(), req.target()));
		}
	}
	/****************************************************************************************************************/
    // 响应POST请求
	if(req.method()== http::verb::post){
		std::string protocol = select_protocol(req.target());
		
		if(post_supported.count(protocol) >0 ){
			std::string body = post_supported[protocol](req.body());
			return send(success_request(body));
		} else {
			return send(not_found(req.method(), req.target()));
		}
	}
}

//------------------------------------------------------------------------------

// Report a failure
void http_fail(beast::error_code ec, char const* what)
{
    std::cerr << what << ": " << ec.message() << "\n";
}

// This is the C++11 equivalent of a generic lambda.
// The function object is used to send an HTTP message.
template
struct send_lambda
{
    Stream& stream_;
    bool& close_;
    beast::error_code& ec_;

    explicit
    send_lambda(
        Stream& stream,
        bool& close,
        beast::error_code& ec)
        : stream_(stream)
        , close_(close)
        , ec_(ec)
    {
    }

    template
    void
    operator()(http::message&& msg) const
    {
        // Determine if we should close the connection after
        close_ = msg.need_eof();

        // We need the serializer here because the serializer requires
        // a non-const file_body, and the message oriented version of
        // http::write only works with const messages.
        http::serializer sr{msg};
        http::write(stream_, sr, ec_);
    }
};

// Handles an HTTP server connection
void
do_session(
    beast::tcp_stream& stream,
    std::shared_ptr const& doc_root,
    net::yield_context yield)
{
    bool close = false;
    beast::error_code ec;

    // This buffer is required to persist across reads
    beast::flat_buffer buffer;

    // This lambda is used to send messages
    send_lambda lambda{stream, close, ec, yield};

    for(;;)
    {
        // Set the timeout.
        stream.expires_after(std::chrono::seconds(30));

        // Read a request
        http::request req;
        http::async_read(stream, buffer, req, yield[ec]);
        if(ec == http::error::end_of_stream)
            break;
        if(ec)
            return fail(ec, "read");
		
        // Send the response
        handle_request(*doc_root, std::move(req), lambda);
        if(ec)
            return fail(ec, "write");
        if(close)
        {
            // This means we should close the connection, usually because
            // the response indicated the "Connection: close" semantic.
            break;
        }
    }

    // Send a TCP shutdown
    stream.socket().shutdown(tcp::socket::shutdown_send, ec);

    // At this point the connection is closed gracefully
}

//------------------------------------------------------------------------------

// Accepts incoming connections and launches the sessions
void
do_listen(
    net::io_context& ioc,
    tcp::endpoint endpoint,
    std::shared_ptr const& doc_root,
    net::yield_context yield)
{
    beast::error_code ec;

    // Open the acceptor
    tcp::acceptor acceptor(ioc);
    acceptor.open(endpoint.protocol(), ec);
    if(ec)
        return fail(ec, "open");

    // Allow address reuse
    acceptor.set_option(net::socket_base::reuse_address(true), ec);
    if(ec)
        return fail(ec, "set_option");

    // Bind to the server address
    acceptor.bind(endpoint, ec);
    if(ec)
        return fail(ec, "bind");

    // Start listening for connections
    acceptor.listen(net::socket_base::max_listen_connections, ec);
    if(ec)
        return fail(ec, "listen");

    for(;;)
    {
        tcp::socket socket(ioc);
        acceptor.async_accept(socket, yield[ec]);
        if(ec)
            fail(ec, "accept");
        else
            boost::asio::spawn(
                acceptor.get_executor(),
                std::bind(
                    &do_session,
                    beast::tcp_stream(std::move(socket)),
                    doc_root,
                    std::placeholders::_1));
    }
}

int main(int argc, char* argv[])
{
    auto const address = net::ip::make_address("192.168.31.111");
    auto const port = static_cast(std::atoi("8066"));
    auto const doc_root = std::make_shared("/");
    auto const threads = std::max(1, std::atoi("2"));

    // The io_context is required for all I/O
    net::io_context ioc{threads};

    // Spawn a listening port
    boost::asio::spawn(ioc,
        std::bind(
            &do_listen,
            std::ref(ioc),
            tcp::endpoint{address, port},
            doc_root,
            std::placeholders::_1));

    // Run the I/O service on the requested number of threads
    std::vector v;
    v.reserve(threads - 1);
    for(auto i = threads - 1; i > 0; --i)
        v.emplace_back(
        [&ioc]
        {
            ioc.run();
        });
    ioc.run();

    return EXIT_SUCCESS;
}

编译:

g++ -g -std=gnu++11 -o server http_server_coro.cpp -I/websocket/boost_1_73_0/  -L/websocket/boost_1_73_0/stage/lib  -lboost_context -lboost_coroutine -lboost_chrono -lpthread

 

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