228 lines
6.7 KiB
C++
228 lines
6.7 KiB
C++
/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2022 Nils Carlson
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef NGHTTP2_ASIO_GRPC_SERVER_H
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#define NGHTTP2_ASIO_GRPC_SERVER_H
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#include <nghttp2/asio_http2_server.h>
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#include <iostream>
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namespace nghttp2 {
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namespace asio_grpc {
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namespace server {
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extern "C" {
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struct __attribute__((packed)) grpc_header {
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uint8_t flags;
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uint32_t length;
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};
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}
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template< typename T, typename U> class grpc_unary_request;
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template< typename U> class grpc_unary_response;
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template<typename T, typename U> using on_unary_grpc = std::function< void(const grpc_unary_request< T, U > &&, grpc_unary_response< U > &&) >;
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class grpc_unary_request_impl
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{
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};
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template< typename T, typename U> class grpc_unary_request
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{
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public:
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grpc_unary_request( const on_unary_grpc< T, U> &on_unary_grpc,
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const ::nghttp2::asio_http2::server::request &request ) :
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on_unary_grpc_{ on_unary_grpc },
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request_{ request }
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{
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}
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void receive_message( grpc_unary_request< T, U > &&grpc_unary_request,
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grpc_unary_response< U > &&grpc_unary_response )
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{
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grpc_header header = { 0, 0 };
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std::string buffer;
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bool have_header = false;
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grpc_unary_request.request_.on_data([header, buffer, have_header,
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grpc_unary_request = std::move(grpc_unary_request),
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grpc_unary_response = std::move(grpc_unary_response)] (const uint8_t *data, std::size_t len) mutable
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{
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if (len == 0)
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{
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return;
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}
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std::copy_n(data, len, std::back_inserter(buffer));
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if (!have_header && buffer.size() >= sizeof (header))
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{
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memcpy(&header, buffer.data(), sizeof (header));
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header.length = ntohl(header.length);
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have_header = true;
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}
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if (have_header && buffer.size() >= (header.length + sizeof (header) ))
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{
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auto parsed = grpc_unary_request.get_message().ParseFromArray( buffer.data() + sizeof (header), header.length );
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if (!parsed)
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{
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// error!
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}
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buffer.erase(0, sizeof(header));
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have_header = false;
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if (parsed)
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{
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grpc_unary_request.on_unary_grpc_( std::move( grpc_unary_request ), std::move( grpc_unary_response ) );
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}
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}
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});
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}
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T &get_message()
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{
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return message_;
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}
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const T &get_message() const
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{
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return message_;
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}
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private:
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T message_;
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on_unary_grpc< T, U> on_unary_grpc_;
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const ::nghttp2::asio_http2::server::request &request_;
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};
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template< typename U> class grpc_unary_response
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{
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public:
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grpc_unary_response( const ::nghttp2::asio_http2::server::response &response ) :
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response_{ response }
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{}
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void write_response( )
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{
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::nghttp2::asio_http2::header_map grpc_response_header;
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::nghttp2::asio_http2::header_value grpc_status_value = { "0", 0 };
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grpc_response_header.insert({ "content-type", {"application/grpc", 0} });
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response_.write_head(200, grpc_response_header);
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auto encoded = message_.SerializeAsString();
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if (encoded.empty())
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{
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std::cerr << "Encoding gailed\n";
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// error!
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}
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std::vector<char> buf;
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buf.resize(sizeof (grpc_header) + encoded.size() );
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std::cerr << "buf size: " << buf.size() << "\n";
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grpc_header *header = reinterpret_cast<grpc_header *>(buf.data());
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header->flags = 0;
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header->length = htonl( encoded.size() );
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std::copy_n(encoded.data(), encoded.size(), buf.data() + sizeof(grpc_header ));
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std::cerr << "message size: " << ntohl(reinterpret_cast<const grpc_header *>(buf.data())->length) << "\n";
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std::size_t count = 0;
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response_.end([=](uint8_t *data, std::size_t len, uint32_t *data_flags) mutable {
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*data_flags |= NGHTTP2_DATA_FLAG_EOF | NGHTTP2_DATA_FLAG_NO_END_STREAM;
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std::cerr << "len " << len << " bytes\n";
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std::cerr << "count " << count << " bytes\n";
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std::size_t to_copy = std::min(buf.size() - count, len );
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std::copy_n( buf.data() + count, to_copy, data );
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std::cerr << "Copied " << to_copy << " bytes\n";
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count += to_copy;
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if (count == buf.size())
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{
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::nghttp2::asio_http2::header_map grpc_response_trailer;
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grpc_response_trailer.insert({ "grpc-status", {"0", 0} });
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response_.write_trailer(grpc_response_trailer);
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std::cerr << "Wrote all data!\n";
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}
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return to_copy;
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});
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}
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U &getMessage()
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{
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return message_;
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}
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private:
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U message_;
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const ::nghttp2::asio_http2::server::response &response_;
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};
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template<typename T, typename U>
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class grpc_unary_handler
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{
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public:
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grpc_unary_handler(on_unary_grpc<T,U> &&on_request ) :
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on_request_{on_request}
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{
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}
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void operator()( const ::nghttp2::asio_http2::server::request &req, const ::nghttp2::asio_http2::server::response &res ) const
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{
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grpc_unary_request<T,U> request{ on_request_, req };
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grpc_unary_response<U> response{ res };
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request.receive_message(std::move(request), std::move(response));
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}
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private:
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on_unary_grpc< T, U > on_request_;
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};
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} // namespace client
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} // namespace asio_grpc
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} // namespace nghttp2
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#endif // NGHTTP2_ASIO_HTTP2_CLIENT_H
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