c++ - nghttp2 asio 连接到 Apple 推送通知超时

Question

我正在使用 nghttp2_asio 连接到 Apple Push Notifications 开发者服务。我正在尝试关注 APN guide as written :

Keep your connections with APNs open across multiple notifications; do not repeatedly open and close connections. APNs treats rapid connection and disconnection as a denial-of-service attack. You should leave a connection open unless you know it will be idle for an extended period of time

所以我试图以连接不会超时的方式编写它。但是，我的连接确实在大约一分钟后超时。我看到为非 nghttp2_asio 发送 PING 帧，但不是为 asio 版本发送，正如 Apple 所说:

You can check the health of your connection using an HTTP/2 PING frame.

如何保持与 APN 的连接？

代码

#include <nghttp2/asio_http2_client.h>

#include <boost/asio/io_service.hpp>
#include <boost/asio/ssl/context.hpp>

#include <boost/uuid/uuid.hpp>
#include <boost/uuid/uuid_generators.hpp>
#include <boost/uuid/uuid_io.hpp>

#include <iostream>

#define LOG_EASY( STREAM ) std::cout << __PRETTY_FUNCTION__ << ": " << STREAM << std::endl;

int main( int argc, char *argv[] )
{
    boost::asio::io_service io_service;
    boost::asio::ssl::context ssl_context( boost::asio::ssl::context::sslv23 );

    std::string hostname( "https://api.development.push.apple.com:443" );

    // The context options
    ssl_context.set_options( boost::asio::ssl::context::default_workarounds |
            boost::asio::ssl::context::no_sslv2 |
            boost::asio::ssl::context::single_dh_use );

    // Now put it up
    ssl_context.use_private_key_file( "/home/mike/dev/cpp/sw/run/certs/apn.key", boost::asio::ssl::context::pem );
    ssl_context.use_certificate_file( "/home/mike/dev/cpp/sw/run/certs/apn.crt", boost::asio::ssl::context::pem );

    boost::system::error_code ec;
    nghttp2::asio_http2::client::configure_tls_context( ec, ssl_context );
    boost::asio::detail::throw_error( ec ); // Throw as necessary

    // Make the new session
    nghttp2::asio_http2::client::session session( io_service,
            ssl_context,
            "api.development.push.apple.com",
            "443" );

    // On connect callberk
    session.on_connect( [ &session, &hostname ]( boost::asio::ip::tcp::resolver::iterator endpoint ) {
        LOG_EASY( "Connected!" );

        // Error cheek
        boost::system::error_code e;

        // Generate a crazy filename
        boost::uuids::uuid uuid = boost::uuids::random_generator()();

        // Header merp
        nghttp2::asio_http2::header_map headers;
        headers.emplace( "apns-id", (nghttp2::asio_http2::header_value){ boost::uuids::to_string( uuid ), false } );
        headers.emplace( "apns-expiration", (nghttp2::asio_http2::header_value){ "0", false } );
        headers.emplace( "apns-priority", (nghttp2::asio_http2::header_value){ "10", false } );
        headers.emplace( "apns-topic", (nghttp2::asio_http2::header_value){ "com.company.App-Topic", false } );

        // Send a test push
        const nghttp2::asio_http2::client::request *request = session.submit( e,
                    "POST",
                    hostname+"/3/device/129a46cbac12d8c523aaf8a1758d07f0fc8b291c776aed4a7dc6f1535be1521e",
                    "{ \"aps\" : { \"alert\" : \"Hello\" } }",
                    headers );

        boost::asio::detail::throw_error( e ); // Throw as necessary

        // Now hook
        request->on_response( []( const nghttp2::asio_http2::client::response &response ){
            LOG_EASY( "response received! Status code: " << response.status_code() );

            response.on_data( []( const uint8_t *data, std::size_t len ) {
                LOG_EASY( "Response length: " << len );
                LOG_EASY( std::string( (const char *)data, len ) );
            } );
        } );

        // On push
        request->on_push( []( const nghttp2::asio_http2::client::request &push ){
            LOG_EASY( "push request received!" );

            push.on_response( []( const nghttp2::asio_http2::client::response &res ){
                LOG_EASY( "push response received!" );

                res.on_data( []( const uint8_t *data, std::size_t len ) {
                    LOG_EASY( std::string( (const char *)data, len ) );
                });
            });

        } );

        // On close
        request->on_close( []( uint32_t error_code ){
            LOG_EASY( "Request close: " << error_code );
        } );
    } );

    // On error kerlbook
    session.on_error( []( const boost::system::error_code &error ) {
        LOG_EASY( error.message() );
    } );

    // Run the servace
    io_service.run();
}

输出

main(int, char**)::<lambda(boost::asio::ip::basic_resolver<boost::asio::ip::tcp>::iterator)>: Connected!
main(int, char**)::<lambda(boost::asio::ip::basic_resolver<boost::asio::ip::tcp>::iterator)>::<lambda(const nghttp2::asio_http2::client::response&)>: response received! Status code: 200
main(int, char**)::<lambda(boost::asio::ip::basic_resolver<boost::asio::ip::tcp>::iterator)>::<lambda(const nghttp2::asio_http2::client::response&)>::<lambda(const uint8_t*, std::size_t)>: Response length: 0
main(int, char**)::<lambda(boost::asio::ip::basic_resolver<boost::asio::ip::tcp>::iterator)>::<lambda(const nghttp2::asio_http2::client::response&)>::<lambda(const uint8_t*, std::size_t)>: 
main(int, char**)::<lambda(boost::asio::ip::basic_resolver<boost::asio::ip::tcp>::iterator)>::<lambda(uint32_t)>: Request close: 0
main(int, char**)::<lambda(const boost::system::error_code&)>: Connection timed out

Answer 1

感谢 nghttp2 的开发人员，现在无需修改上述代码即可使用此功能。

https://github.com/nghttp2/nghttp2/issues/847