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- //
- // connect_pair.cpp
- // ~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2019 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 <iostream>
- #include <string>
- #include <cctype>
- #include <boost/asio.hpp>
- #include <boost/thread/thread.hpp>
- #if defined(BOOST_ASIO_HAS_LOCAL_SOCKETS)
- using boost::asio::local::stream_protocol;
- class uppercase_filter
- {
- public:
- uppercase_filter(stream_protocol::socket sock)
- : socket_(std::move(sock))
- {
- read();
- }
- private:
- void read()
- {
- socket_.async_read_some(boost::asio::buffer(data_),
- [this](boost::system::error_code ec, std::size_t size)
- {
- if (!ec)
- {
- // Compute result.
- for (std::size_t i = 0; i < size; ++i)
- data_[i] = std::toupper(data_[i]);
- // Send result.
- write(size);
- }
- else
- {
- throw boost::system::system_error(ec);
- }
- });
- }
- void write(std::size_t size)
- {
- boost::asio::async_write(socket_, boost::asio::buffer(data_, size),
- [this](boost::system::error_code ec, std::size_t /*size*/)
- {
- if (!ec)
- {
- // Wait for request.
- read();
- }
- else
- {
- throw boost::system::system_error(ec);
- }
- });
- }
- stream_protocol::socket socket_;
- std::array<char, 512> data_;
- };
- int main()
- {
- try
- {
- boost::asio::io_context io_context;
- // Create a connected pair and pass one end to a filter.
- stream_protocol::socket socket(io_context);
- stream_protocol::socket filter_socket(io_context);
- boost::asio::local::connect_pair(socket, filter_socket);
- uppercase_filter filter(std::move(filter_socket));
- // The io_context runs in a background thread to perform filtering.
- boost::thread thread(
- [&io_context]()
- {
- try
- {
- io_context.run();
- }
- catch (std::exception& e)
- {
- std::cerr << "Exception in thread: " << e.what() << "\n";
- std::exit(1);
- }
- });
- for (;;)
- {
- // Collect request from user.
- std::cout << "Enter a string: ";
- std::string request;
- std::getline(std::cin, request);
- // Send request to filter.
- boost::asio::write(socket, boost::asio::buffer(request));
- // Wait for reply from filter.
- std::vector<char> reply(request.size());
- boost::asio::read(socket, boost::asio::buffer(reply));
- // Show reply to user.
- std::cout << "Result: ";
- std::cout.write(&reply[0], request.size());
- std::cout << std::endl;
- }
- }
- catch (std::exception& e)
- {
- std::cerr << "Exception: " << e.what() << "\n";
- std::exit(1);
- }
- }
- #else // defined(BOOST_ASIO_HAS_LOCAL_SOCKETS)
- # error Local sockets not available on this platform.
- #endif // defined(BOOST_ASIO_HAS_LOCAL_SOCKETS)
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