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Diffstat (limited to '3rdparty/asio/src/examples/cpp11/chat/posix_chat_client.cpp')
-rw-r--r-- | 3rdparty/asio/src/examples/cpp11/chat/posix_chat_client.cpp | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/3rdparty/asio/src/examples/cpp11/chat/posix_chat_client.cpp b/3rdparty/asio/src/examples/cpp11/chat/posix_chat_client.cpp new file mode 100644 index 00000000000..a77b8cfb001 --- /dev/null +++ b/3rdparty/asio/src/examples/cpp11/chat/posix_chat_client.cpp @@ -0,0 +1,198 @@ +// +// posix_chat_client.cpp +// ~~~~~~~~~~~~~~~~~~~~~ +// +// Copyright (c) 2003-2024 Christopher M. Kohlhoff (chris at kohlhoff dot com) +// +// 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) +// + +#include <array> +#include <cstdlib> +#include <cstring> +#include <iostream> +#include "asio.hpp" +#include "chat_message.hpp" + +#if defined(ASIO_HAS_POSIX_STREAM_DESCRIPTOR) + +using asio::ip::tcp; +namespace posix = asio::posix; + +class posix_chat_client +{ +public: + posix_chat_client(asio::io_context& io_context, + const tcp::resolver::results_type& endpoints) + : socket_(io_context), + input_(io_context, ::dup(STDIN_FILENO)), + output_(io_context, ::dup(STDOUT_FILENO)), + input_buffer_(chat_message::max_body_length) + { + do_connect(endpoints); + } + +private: + void do_connect(const tcp::resolver::results_type& endpoints) + { + asio::async_connect(socket_, endpoints, + [this](std::error_code ec, tcp::endpoint) + { + if (!ec) + { + do_read_header(); + do_read_input(); + } + }); + } + + void do_read_header() + { + asio::async_read(socket_, + asio::buffer(read_msg_.data(), chat_message::header_length), + [this](std::error_code ec, std::size_t /*length*/) + { + if (!ec && read_msg_.decode_header()) + { + do_read_body(); + } + else + { + close(); + } + }); + } + + void do_read_body() + { + asio::async_read(socket_, + asio::buffer(read_msg_.body(), read_msg_.body_length()), + [this](std::error_code ec, std::size_t /*length*/) + { + if (!ec) + { + do_write_output(); + } + else + { + close(); + } + }); + } + + void do_write_output() + { + // Write out the message we just received, terminated by a newline. + static char eol[] = { '\n' }; + std::array<asio::const_buffer, 2> buffers = {{ + asio::buffer(read_msg_.body(), read_msg_.body_length()), + asio::buffer(eol) }}; + asio::async_write(output_, buffers, + [this](std::error_code ec, std::size_t /*length*/) + { + if (!ec) + { + do_read_header(); + } + else + { + close(); + } + }); + } + + void do_read_input() + { + // Read a line of input entered by the user. + asio::async_read_until(input_, input_buffer_, '\n', + [this](std::error_code ec, std::size_t length) + { + if (!ec) + { + // Write the message (minus the newline) to the server. + write_msg_.body_length(length - 1); + input_buffer_.sgetn(write_msg_.body(), length - 1); + input_buffer_.consume(1); // Remove newline from input. + write_msg_.encode_header(); + do_write_message(); + } + else if (ec == asio::error::not_found) + { + // Didn't get a newline. Send whatever we have. + write_msg_.body_length(input_buffer_.size()); + input_buffer_.sgetn(write_msg_.body(), input_buffer_.size()); + write_msg_.encode_header(); + do_write_message(); + } + else + { + close(); + } + }); + } + + void do_write_message() + { + asio::async_write(socket_, + asio::buffer(write_msg_.data(), write_msg_.length()), + [this](std::error_code ec, std::size_t /*length*/) + { + if (!ec) + { + do_read_input(); + } + else + { + close(); + } + }); + } + + void close() + { + // Cancel all outstanding asynchronous operations. + socket_.close(); + input_.close(); + output_.close(); + } + +private: + tcp::socket socket_; + posix::stream_descriptor input_; + posix::stream_descriptor output_; + chat_message read_msg_; + chat_message write_msg_; + asio::streambuf input_buffer_; +}; + +int main(int argc, char* argv[]) +{ + try + { + if (argc != 3) + { + std::cerr << "Usage: posix_chat_client <host> <port>\n"; + return 1; + } + + asio::io_context io_context; + + tcp::resolver resolver(io_context); + tcp::resolver::results_type endpoints = resolver.resolve(argv[1], argv[2]); + + posix_chat_client c(io_context, endpoints); + + io_context.run(); + } + catch (std::exception& e) + { + std::cerr << "Exception: " << e.what() << "\n"; + } + + return 0; +} + +#else // defined(ASIO_HAS_POSIX_STREAM_DESCRIPTOR) +int main() {} +#endif // defined(ASIO_HAS_POSIX_STREAM_DESCRIPTOR) |