diff options
Diffstat (limited to '3rdparty/asio/src/examples/cpp03/porthopper/client.cpp')
-rw-r--r-- | 3rdparty/asio/src/examples/cpp03/porthopper/client.cpp | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/3rdparty/asio/src/examples/cpp03/porthopper/client.cpp b/3rdparty/asio/src/examples/cpp03/porthopper/client.cpp deleted file mode 100644 index 15d8e4803c1..00000000000 --- a/3rdparty/asio/src/examples/cpp03/porthopper/client.cpp +++ /dev/null @@ -1,192 +0,0 @@ -// -// client.cpp -// ~~~~~~~~~~ -// -// Copyright (c) 2003-2016 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 <asio.hpp> -#include <boost/lambda/lambda.hpp> -#include <boost/lambda/bind.hpp> -#include <boost/lambda/if.hpp> -#include <boost/shared_ptr.hpp> -#include <algorithm> -#include <cstdlib> -#include <exception> -#include <iostream> -#include <string> -#include "protocol.hpp" - -using namespace boost; -using asio::ip::tcp; -using asio::ip::udp; - -int main(int argc, char* argv[]) -{ - try - { - if (argc != 3) - { - std::cerr << "Usage: client <host> <port>\n"; - return 1; - } - using namespace std; // For atoi. - std::string host_name = argv[1]; - std::string port = argv[2]; - - asio::io_context io_context; - - // Determine the location of the server. - tcp::resolver resolver(io_context); - tcp::endpoint remote_endpoint = *resolver.resolve(host_name, port).begin(); - - // Establish the control connection to the server. - tcp::socket control_socket(io_context); - control_socket.connect(remote_endpoint); - - // Create a datagram socket to receive data from the server. - boost::shared_ptr<udp::socket> data_socket( - new udp::socket(io_context, udp::endpoint(udp::v4(), 0))); - - // Determine what port we will receive data on. - udp::endpoint data_endpoint = data_socket->local_endpoint(); - - // Ask the server to start sending us data. - control_request start = control_request::start(data_endpoint.port()); - asio::write(control_socket, start.to_buffers()); - - unsigned long last_frame_number = 0; - for (;;) - { - // Receive 50 messages on the current data socket. - for (int i = 0; i < 50; ++i) - { - // Receive a frame from the server. - frame f; - data_socket->receive(f.to_buffers(), 0); - if (f.number() > last_frame_number) - { - last_frame_number = f.number(); - std::cout << "\n" << f.payload(); - } - } - - // Time to switch to a new socket. To ensure seamless handover we will - // continue to receive packets using the old socket until data arrives on - // the new one. - std::cout << " Starting renegotiation"; - - // Create the new data socket. - boost::shared_ptr<udp::socket> new_data_socket( - new udp::socket(io_context, udp::endpoint(udp::v4(), 0))); - - // Determine the new port we will use to receive data. - udp::endpoint new_data_endpoint = new_data_socket->local_endpoint(); - - // Ask the server to switch over to the new port. - control_request change = control_request::change( - data_endpoint.port(), new_data_endpoint.port()); - asio::error_code control_result; - asio::async_write(control_socket, change.to_buffers(), - ( - lambda::var(control_result) = lambda::_1 - )); - - // Try to receive a frame from the server on the new data socket. If we - // successfully receive a frame on this new data socket we can consider - // the renegotation complete. In that case we will close the old data - // socket, which will cause any outstanding receive operation on it to be - // cancelled. - frame f1; - asio::error_code new_data_socket_result; - new_data_socket->async_receive(f1.to_buffers(), - ( - // Note: lambda::_1 is the first argument to the callback handler, - // which in this case is the error code for the operation. - lambda::var(new_data_socket_result) = lambda::_1, - lambda::if_(!lambda::_1) - [ - // We have successfully received a frame on the new data socket, - // so we can close the old data socket. This will cancel any - // outstanding receive operation on the old data socket. - lambda::var(data_socket) = boost::shared_ptr<udp::socket>() - ] - )); - - // This loop will continue until we have successfully completed the - // renegotiation (i.e. received a frame on the new data socket), or some - // unrecoverable error occurs. - bool done = false; - while (!done) - { - // Even though we're performing a renegotation, we want to continue - // receiving data as smoothly as possible. Therefore we will continue to - // try to receive a frame from the server on the old data socket. If we - // receive a frame on this socket we will interrupt the io_context, - // print the frame, and resume waiting for the other operations to - // complete. - frame f2; - done = true; // Let's be optimistic. - if (data_socket) // Might have been closed by new_data_socket's handler. - { - data_socket->async_receive(f2.to_buffers(), 0, - ( - lambda::if_(!lambda::_1) - [ - // We have successfully received a frame on the old data - // socket. Stop the io_context so that we can print it. - lambda::bind(&asio::io_context::stop, &io_context), - lambda::var(done) = false - ] - )); - } - - // Run the operations in parallel. This will block until all operations - // have finished, or until the io_context is interrupted. (No threads!) - io_context.restart(); - io_context.run(); - - // If the io_context.run() was interrupted then we have received a frame - // on the old data socket. We need to keep waiting for the renegotation - // operations to complete. - if (!done) - { - if (f2.number() > last_frame_number) - { - last_frame_number = f2.number(); - std::cout << "\n" << f2.payload(); - } - } - } - - // Since the loop has finished, we have either successfully completed - // the renegotation, or an error has occurred. First we'll check for - // errors. - if (control_result) - throw asio::system_error(control_result); - if (new_data_socket_result) - throw asio::system_error(new_data_socket_result); - - // If we get here it means we have successfully started receiving data on - // the new data socket. This new data socket will be used from now on - // (until the next time we renegotiate). - std::cout << " Renegotiation complete"; - data_socket = new_data_socket; - data_endpoint = new_data_endpoint; - if (f1.number() > last_frame_number) - { - last_frame_number = f1.number(); - std::cout << "\n" << f1.payload(); - } - } - } - catch (std::exception& e) - { - std::cerr << "Exception: " << e.what() << std::endl; - } - - return 0; -} |