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C++と色々

主にC++やプログラムに関する記事を投稿します。

Asioで非同期Http通信

Boost.Asioから切り離したAsioライブラリがあります。

asio C++ library

名前空間が違うぐらいでほとんどBoost.Asioと同じように使えます。Boost.AsioがBoost.SystemErrorやBoost.DateTimeに依存しているのに対し、独立して動くという点が嬉しいです。

試しに非同期にhttp通信するコードを書いてみました。以前の記事との違いは非同期になった点です。以前の記事は同期処理になっています。

Boost.AsioでHTTP通信 - C++と色々

AsioのExapmlesには非同期のHttp通信はありませんが、 Boost.AsioのC++03のExamplesに非同期Http通信クライアントのサンプルコードが有るため、それの名前空間を修正して使ってみました。

サンプルそのままだと動かない部分があったので修正を加えています。またエラー処理は一番外側のtry-catch以外全く書いていませんのでご注意下さい。

動作環境はVisual Studio 2015とNuGetで取れる最新のAsio 1.10.2です。2016/4/8現在のAsio自体の最新は1.10.6です。

javascriptなどでは見慣れたコールバック地獄になっています。今後の目標はfutureやコルーチンを使った実装でコールバック地獄を緩和することです。

#define ASIO_ERROR_CATEGORY_NOEXCEPT noexcept
#include <asio.hpp>
#include <iostream>
#include <thread>
#include <sstream>
#include <memory>

int main()
{
    try {
        asio::io_service io;
        asio::ip::tcp::resolver resolver{io};
        asio::ip::tcp::resolver::query query{"www.boost.org", "http"};
        asio::ip::tcp::socket socket{io};
        resolver.async_resolve(query, [&](auto const&, asio::ip::tcp::resolver::iterator endpoint) {
            std::cout << "resolve" << std::endl;
            asio::async_connect(socket, endpoint, [&](auto const&, auto) {
                std::cout << "connect" << std::endl;
                std::ostringstream os;
                os << "GET " << "/" << " HTTP/1.0\r\n";
                os << "Host: " << "www.boost.org" << "\r\n";
                os << "Accept: */*\r\n";
                os << "Connection: close\r\n\r\n";
                asio::async_write(socket, asio::buffer(os.str().data(), os.str().size()), [&](auto error_code, auto) {
                    std::cout << "write" << std::endl;
                    auto response = std::make_shared<asio::streambuf>();
                    asio::async_read(socket, *response, [&, response](auto, auto) {
                        std::cout << "read" << std::endl;
                        std::istream iss(response.get());
                        std::string buf;
                        while (iss && std::getline(iss, buf)) {
                            std::cout << buf << std::endl;
                        }
                    });
                });
            });
        });
        std::thread thread{[&io] { io.run(); }};
        thread.join();
    } catch (std::exception const& e) {
        std::cout << e.what() << std::endl;
    }
}

実行結果例

resolve
connect
write
read
HTTP/1.1 200 OK
Date: Thu, 07 Apr 2016 20:17:18 GMT
Server: Apache/2.2.15 (Red Hat)
Accept-Ranges: bytes
Connection: close
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続行するには何かキーを押してください . . .