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Add echo_async_server example#862
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242 changes: 242 additions & 0 deletionslibs/network/example/http/echo_async_server.cpp
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| // Copyright 2018 Martin Trenkmann | ||
| // Based on cpp-netlib/libs/network/example/http/fileserver.cpp | ||
| // Distributed under the Boost Software License, Version 1.0. | ||
| // (See accompanying file LICENSE_1_0.txt or copy at | ||
| // http://www.boost.org/LICENSE_1_0.txt) | ||
| // This example implements a minimal echo server that receives plain text via | ||
| // POST requests and sends the same text back to the client (with an additional | ||
| // newline appended for nicer output). Since the server uses asynchronous I/O, | ||
| // the body data is not available through request.body, but must be read using | ||
| // connection->read(callback). | ||
| // | ||
| // This code is minimal, it does not... | ||
| // - handle any kinds of errors, | ||
| // - look at the URI path (request.destination), | ||
| // - handle request methods other than POST (request.method), | ||
| // - check for too large bodies (which make the server vulnerable to attacks), | ||
| // - model state, e.g. database connections (this type of context should be | ||
| // injected into the post_request_handler constructor). | ||
| // | ||
| // About handling large body data: | ||
| // According to https://tools.ietf.org/html/rfc2616#section-8.2.3, HTTP clients | ||
| // may send a "Expect: 100-continue" header before sending large body data in | ||
| // order to negotiate whether the server is willing to accept the data. If the | ||
| // server agrees, it should send an interim response with a "100 Continue" | ||
| // status code. The client then should start sending the data and upon | ||
| // completion, the server should send a final response including a status code | ||
| // and possibly headers and body data. | ||
| // | ||
| // About cpp-netlib 0.13 and the "Expect: 100-continue" header: | ||
| // When a client sends a POST request with a "Expect: 100-continue" header, the | ||
| // callback passed into connection->read() gets triggered with an empty chunk of | ||
| // data. As described before, the server should then send an "100 Continue" | ||
| // interim response, but this seems to be not supported by the library at the | ||
| // moment, because trying to set and send a status code on the connection object | ||
| // more than once throws an exception. However, since clients are allowed to | ||
| // send data even though they never received a "100 Continue", the server should | ||
| // continue reading data from the connection, by calling connection->read() | ||
| // again, until the expected number of bytes, based on the "Content-Length" | ||
| // header, has been received. | ||
| // | ||
| // About curl and the "Expect: 100-continue" header: | ||
| // According to https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Expect | ||
| // no common browsers make use of the "Expect" header, but some other clients | ||
| // such as curl do so by default. In fact, curl sends a "Expect: 100-continue" | ||
| // header with POST requests that contain at least 1KiB of data (see example | ||
| // session below). Fortunately, curl also starts sending the data if it does | ||
| // not receive a "100 Continue" status code after a timeout of 1 second, which | ||
| // makes it "compatible" with servers that cannot send interim responses such as | ||
| // cpp-netlib 0.13. | ||
| // | ||
| // The timeout in curl is configurable via "--expect100-timeout <seconds>" | ||
| // command line argument. The minimum value seems to be 1 second. | ||
| // | ||
| // Example session: | ||
| // Two POST requests are sent to the echo server using curl. The first one with | ||
| // data less than 1KiB, the second one with data more than 1KiB which shows the | ||
| // use of the "Expect: 100-continue" header. | ||
| // | ||
| // The "lorem" command generates lorem ipsum text. It can be installed via | ||
| // "sudo apt-get install libtext-lorem-perl" on Debian-based systems. | ||
| // | ||
| // 1. Sending less than 1KiB | ||
| // ------------------------- | ||
| // | ||
| // $ curl -v -H 'Content-Type: text/plain' -d "$(lorem -s 3 | fold)" http://localhost:8000 | ||
| // * Rebuilt URL to: http://localhost:8000/ | ||
| // * Trying 127.0.0.1... | ||
| // * Connected to localhost (127.0.0.1) port 8000 (#0) | ||
| // > POST / HTTP/1.1 | ||
| // > Host: localhost:8000 | ||
| // > User-Agent: curl/7.47.0 | ||
| // > Accept: */* | ||
| // > Content-Type: text/plain | ||
| // > Content-Length: 155 | ||
| // > | ||
| // * upload completely sent off: 155 out of 155 bytes | ||
| // < HTTP/1.1 200 OK | ||
| // < Content-Type: text/plain | ||
| // < Content-Length: 156 | ||
| // < | ||
| // Iusto autem omnis necessitatibus quia omnis nemo sequi. Occaecati est explicabo | ||
| // qui placeat ipsa debitis fugit sit. Quasi sequi in est eius qui molestiae. | ||
| // * Connection #0 to host localhost left intact | ||
| // | ||
| // SERVER OUTPUT | ||
| // | ||
| // Host: localhost:8000 | ||
| // User-Agent: curl/7.47.0 | ||
| // Accept: */* | ||
| // Content-Type: text/plain | ||
| // Content-Length: 155 | ||
| // Chunk size: 155 | ||
| // | ||
| // 2. Sending more than 1KiB | ||
| // ------------------------- | ||
| // | ||
| // $ curl -v -H 'Content-Type: text/plain' -d "$(lorem -s 30 | fold)" http://localhost:8000 | ||
| // * Rebuilt URL to: http://localhost:8000/ | ||
| // * Trying 127.0.0.1... | ||
| // * Connected to localhost (127.0.0.1) port 8000 (#0) | ||
| // > POST / HTTP/1.1 | ||
| // > Host: localhost:8000 | ||
| // > User-Agent: curl/7.47.0 | ||
| // > Accept: */* | ||
| // > Content-Type: text/plain | ||
| // > Content-Length: 1324 | ||
| // > Expect: 100-continue | ||
| // > | ||
| // * Done waiting for 100-continue | ||
| // * We are completely uploaded and fine | ||
| // < HTTP/1.1 200 OK | ||
| // < Content-Type: text/plain | ||
| // < Content-Length: 1325 | ||
| // < | ||
| // Fugit quo aliquid in et consectetur sed id. Aliquam dolor optio labore sit autem | ||
| // . Culpa at omnis et consectetur minima nostrum sed. Veniam similique dolorum des | ||
| // erunt aut et et aut quo. Laudantium nesciunt est repellat. Dolores adipisci alia | ||
| // s dicta dicta. Impedit porro pariatur quisquam sit ex ducimus a. Consequatur ius | ||
| // to possimus in sint nesciunt molestiae fugiat et. Est praesentium quos quam libe | ||
| // ro vel nostrum placeat consequuntur. Tempora nihil aut aliquam. Atque ab sunt ut | ||
| // sed quo ut. Quia qui omnis non. In laboriosam possimus laboriosam consequatur v | ||
| // el dolores. Reprehenderit totam quis dolore debitis ullam. Aut iure omnis invent | ||
| // ore quaerat aut veniam vel magni. Temporibus voluptatibus accusamus qui facilis | ||
| // at aut. Voluptatem provident incidunt officia. Quos quo autem quae illo. Modi am | ||
| // et quis eveniet. Nemo tenetur quia unde. Velit molestiae laborum eum. Repellat m | ||
| // olestias eos eos accusantium dolorem molestias pariatur ex. Nihil dolorum possim | ||
| // us ut ut beatae. Quia nam sit aut voluptatum maiores quibusdam id aliquid. Nulla | ||
| // numquam rem quo doloremque ut ut. Aspernatur accusamus illo illo dolores repudi | ||
| // andae dicta reiciendis. Quis laborum magni et incidunt nihil. Ea quia consequunt | ||
| // ur quos minima aut veniam ratione sed. Ea deleniti accusamus est quo nisi. Quia | ||
| // quibusdam et aut reiciendis. | ||
| // * Connection #0 to host localhost left intact | ||
| // | ||
| // SERVER OUTPUT | ||
| // | ||
| // Host: localhost:8000 | ||
| // User-Agent: curl/7.47.0 | ||
| // Accept: */* | ||
| // Content-Type: text/plain | ||
| // Content-Length: 1324 | ||
| // Expect: 100-continue | ||
| // Chunk size: 0 | ||
| // Chunk size: 1024 | ||
| // Chunk size: 300 | ||
| #include <boost/asio/signal_set.hpp> | ||
| #include <boost/network/protocol/http/server.hpp> | ||
| #include <cassert> | ||
| #include <memory> | ||
| #include <string> | ||
| #include <vector> | ||
| namespace http = boost::network::http; | ||
| struct request_handler; | ||
| using echo_server = http::server<request_handler>; | ||
| struct post_request_handler | ||
| : public std::enable_shared_from_this<post_request_handler> { | ||
| explicit post_request_handler(const echo_server::request& request) | ||
| : content_length_(0) { | ||
| for (const auto& header : request.headers) { | ||
| std::cout << header.name << ": " << header.value << '\n'; | ||
| if (boost::iequals(header.name, "content-length")) { | ||
| content_length_ = std::stoul(header.value); | ||
| } | ||
| } | ||
| } | ||
| void operator()(echo_server::connection::input_range chunk, | ||
| boost::system::error_code ec, size_t chunk_size, | ||
| echo_server::connection_ptr connection) { | ||
| assert(chunk.size() == chunk_size); | ||
| std::cout << "Chunk size: " << chunk_size << '\n'; | ||
| if (ec) { | ||
| std::cerr << "Error code: " << ec << '\n'; | ||
| return; | ||
| } | ||
| body_.append(chunk.begin(), chunk.end()); | ||
| if (body_.size() < content_length_) { | ||
| auto self = this->shared_from_this(); | ||
| connection->read([self](echo_server::connection::input_range chunk, | ||
| boost::system::error_code ec, size_t chunk_size, | ||
| echo_server::connection_ptr connection) { | ||
| (*self)(chunk, ec, chunk_size, connection); | ||
| }); | ||
| return; | ||
| } | ||
| body_.push_back('\n'); | ||
| std::vector<echo_server::response_header> headers; | ||
| headers.push_back({"Content-Type", "text/plain"}); | ||
| headers.push_back({"Content-Length", std::to_string(body_.size())}); | ||
| connection->set_status(echo_server::connection::ok); | ||
| connection->set_headers(headers); | ||
| connection->write(body_); | ||
| } | ||
| private: | ||
| size_t content_length_; | ||
| std::string body_; | ||
| }; | ||
| struct request_handler { | ||
| void operator()(const echo_server::request& request, | ||
| echo_server::connection_ptr connection) { | ||
| if (request.method == "POST") { | ||
| auto h = std::make_shared<post_request_handler>(request); | ||
| connection->read([h](echo_server::connection::input_range chunk, | ||
| boost::system::error_code ec, size_t chunk_size, | ||
| echo_server::connection_ptr connection) { | ||
| (*h)(chunk, ec, chunk_size, connection); | ||
| }); | ||
| } | ||
| } | ||
| }; | ||
| int main() { | ||
| try { | ||
| request_handler handler; | ||
| auto io_service = std::make_shared<boost::asio::io_service>(); | ||
| echo_server server( | ||
| echo_server::options(handler).io_service(io_service).port("8000")); | ||
| server.run(); | ||
| // Clean shutdown when pressing Ctrl+C. | ||
| boost::asio::signal_set signals(*io_service, SIGINT, SIGTERM); | ||
| signals.async_wait([&server](const boost::system::error_code& ec, | ||
| int /* signal_number */) { | ||
| if (!ec) { | ||
| server.stop(); | ||
| } | ||
| }); | ||
| return EXIT_SUCCESS; | ||
| } catch (const std::exception& error) { | ||
| std::cerr << error.what() << std::endl; | ||
| return EXIT_FAILURE; | ||
| } | ||
| } |
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