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The BOOST_ASIO_HANDLER_LOCATION((file_name, line, function_name)) macro
may be used to inform the handler tracking mechanism of a source
location. This macro declares an object that is placed on the stack.
When an asynchronous operation is launched with location information, it
outputs lines using the <action> 'n^m', prior to the 'n*m' line that
signifies the beginning of the asynchronous operation. For example:
@asio|1589423304.861944|>7|ec=system:0,bytes_transferred=5
@asio|1589423304.861952|7^8|in 'async_write' (./../../../include/asio/impl/write.hpp:330)
@asio|1589423304.861952|7^8|called from 'do_write' (handler_tracking/async_tcp_echo_server.cpp:62)
@asio|1589423304.861952|7^8|called from 'operator()' (handler_tracking/async_tcp_echo_server.cpp:51)
@asio|1589423304.861952|7*8|socket@0x7ff61c008230.async_send
@asio|1589423304.861975|.8|non_blocking_send,ec=system:0,bytes_transferred=5
@asio|1589423304.861980|<7|
If std::source_location or std::experimental::source_location are
available, the use_awaitable_t token (when default-constructed or used
as a default completion token) will also cause handler tracking to
output a source location for each newly created asynchronous operation.
A use_awaitable_t object may also be explicitly constructed with location
information.
136 lines
2.7 KiB
C++
136 lines
2.7 KiB
C++
//
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// async_tcp_echo_server.cpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include <cstdlib>
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#include <iostream>
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#include <memory>
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#include <utility>
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#include <boost/asio.hpp>
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using boost::asio::ip::tcp;
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// Define a helper macro to invoke BOOST_ASIO_HANDLER_LOCATION with the current
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// file name, line number, and function name. For the function name, you might
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// also consider using __PRETTY_FUNCTION__, BOOST_CURRENT_FUNCTION, or a hand-
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// crafted name. For C++20 or later, you may also use std::source_location.
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#define HANDLER_LOCATION \
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BOOST_ASIO_HANDLER_LOCATION((__FILE__, __LINE__, __func__))
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class session
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: public std::enable_shared_from_this<session>
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{
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public:
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session(tcp::socket socket)
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: socket_(std::move(socket))
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{
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}
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void start()
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{
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HANDLER_LOCATION;
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do_read();
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}
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private:
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void do_read()
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{
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HANDLER_LOCATION;
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auto self(shared_from_this());
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socket_.async_read_some(boost::asio::buffer(data_, max_length),
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[this, self](boost::system::error_code ec, std::size_t length)
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{
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HANDLER_LOCATION;
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if (!ec)
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{
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do_write(length);
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}
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});
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}
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void do_write(std::size_t length)
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{
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HANDLER_LOCATION;
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auto self(shared_from_this());
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boost::asio::async_write(socket_, boost::asio::buffer(data_, length),
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[this, self](boost::system::error_code ec, std::size_t /*length*/)
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{
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HANDLER_LOCATION;
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if (!ec)
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{
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do_read();
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}
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});
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}
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tcp::socket socket_;
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enum { max_length = 1024 };
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char data_[max_length];
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};
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class server
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{
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public:
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server(boost::asio::io_context& io_context, short port)
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: acceptor_(io_context, tcp::endpoint(tcp::v4(), port))
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{
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do_accept();
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}
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private:
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void do_accept()
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{
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HANDLER_LOCATION;
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acceptor_.async_accept(
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[this](boost::system::error_code ec, tcp::socket socket)
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{
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HANDLER_LOCATION;
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if (!ec)
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{
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std::make_shared<session>(std::move(socket))->start();
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}
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do_accept();
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});
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}
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tcp::acceptor acceptor_;
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};
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int main(int argc, char* argv[])
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{
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try
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{
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if (argc != 2)
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{
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std::cerr << "Usage: async_tcp_echo_server <port>\n";
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return 1;
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}
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boost::asio::io_context io_context;
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server s(io_context, std::atoi(argv[1]));
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io_context.run();
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}
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catch (std::exception& e)
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{
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std::cerr << "Exception: " << e.what() << "\n";
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}
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return 0;
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}
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