summaryrefslogtreecommitdiffstatshomepage
path: root/3rdparty/asio/src/examples/cpp11/timeouts/blocking_token_tcp_client.cpp
diff options
context:
space:
mode:
Diffstat (limited to '3rdparty/asio/src/examples/cpp11/timeouts/blocking_token_tcp_client.cpp')
-rw-r--r--3rdparty/asio/src/examples/cpp11/timeouts/blocking_token_tcp_client.cpp171
1 files changed, 171 insertions, 0 deletions
diff --git a/3rdparty/asio/src/examples/cpp11/timeouts/blocking_token_tcp_client.cpp b/3rdparty/asio/src/examples/cpp11/timeouts/blocking_token_tcp_client.cpp
new file mode 100644
index 00000000000..085570d8b78
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp11/timeouts/blocking_token_tcp_client.cpp
@@ -0,0 +1,171 @@
+//
+// blocking_token_tcp_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 "asio/connect.hpp"
+#include "asio/io_context.hpp"
+#include "asio/ip/tcp.hpp"
+#include "asio/read_until.hpp"
+#include "asio/streambuf.hpp"
+#include "asio/system_error.hpp"
+#include "asio/write.hpp"
+#include <cstdlib>
+#include <iostream>
+#include <memory>
+#include <string>
+
+using asio::ip::tcp;
+
+// NOTE: This example uses the new form of the asio::async_result trait.
+// For an example that works with the Networking TS style of completion tokens,
+// please see an older version of asio.
+
+// We will use our sockets only with an io_context.
+using tcp_socket = asio::basic_stream_socket<
+ tcp, asio::io_context::executor_type>;
+
+//----------------------------------------------------------------------
+
+// A custom completion token that makes asynchronous operations behave as
+// though they are blocking calls with a timeout.
+struct close_after
+{
+ close_after(std::chrono::steady_clock::duration t, tcp_socket& s)
+ : timeout_(t), socket_(s)
+ {
+ }
+
+ // The maximum time to wait for an asynchronous operation to complete.
+ std::chrono::steady_clock::duration timeout_;
+
+ // The socket to be closed if the operation does not complete in time.
+ tcp_socket& socket_;
+};
+
+namespace asio {
+
+// The async_result template is specialised to allow the close_after token to
+// be used with asynchronous operations that have a completion signature of
+// void(error_code, T). Generalising this for all completion signature forms is
+// left as an exercise for the reader.
+template <typename T>
+class async_result<close_after, void(std::error_code, T)>
+{
+public:
+ // The initiate() function is used to launch the asynchronous operation by
+ // calling the operation's initiation function object. For the close_after
+ // completion token, we use this function to run the io_context until the
+ // operation is complete.
+ template <typename Init, typename... Args>
+ static T initiate(Init init, close_after token, Args&&... args)
+ {
+ asio::io_context& io_context = asio::query(
+ token.socket_.get_executor(), asio::execution::context);
+
+ // Call the operation's initiation function object to start the operation.
+ // A lambda is supplied as the completion handler, to be called when the
+ // operation completes.
+ std::error_code error;
+ T result;
+ init([&](std::error_code e, T t)
+ {
+ error = e;
+ result = t;
+ }, std::forward<Args>(args)...);
+
+ // Restart the io_context, as it may have been left in the "stopped" state
+ // by a previous operation.
+ io_context.restart();
+
+ // Block until the asynchronous operation has completed, or timed out. If
+ // the pending asynchronous operation is a composed operation, the deadline
+ // applies to the entire operation, rather than individual operations on
+ // the socket.
+ io_context.run_for(token.timeout_);
+
+ // If the asynchronous operation completed successfully then the io_context
+ // would have been stopped due to running out of work. If it was not
+ // stopped, then the io_context::run_for call must have timed out and the
+ // operation is still incomplete.
+ if (!io_context.stopped())
+ {
+ // Close the socket to cancel the outstanding asynchronous operation.
+ token.socket_.close();
+
+ // Run the io_context again until the operation completes.
+ io_context.run();
+ }
+
+ // If the operation failed, throw an exception. Otherwise return the result.
+ return error ? throw std::system_error(error) : result;
+ }
+};
+
+} // namespace asio
+
+//----------------------------------------------------------------------
+
+int main(int argc, char* argv[])
+{
+ try
+ {
+ if (argc != 4)
+ {
+ std::cerr << "Usage: blocking_tcp_client <host> <port> <message>\n";
+ return 1;
+ }
+
+ asio::io_context io_context;
+
+ // Resolve the host name and service to a list of endpoints.
+ auto endpoints = tcp::resolver(io_context).resolve(argv[1], argv[2]);
+
+ tcp_socket socket(io_context);
+
+ // Run an asynchronous connect operation with a timeout.
+ asio::async_connect(socket, endpoints,
+ close_after(std::chrono::seconds(10), socket));
+
+ auto time_sent = std::chrono::steady_clock::now();
+
+ // Run an asynchronous write operation with a timeout.
+ std::string msg = argv[3] + std::string("\n");
+ asio::async_write(socket, asio::buffer(msg),
+ close_after(std::chrono::seconds(10), socket));
+
+ for (std::string input_buffer;;)
+ {
+ // Run an asynchronous read operation with a timeout.
+ std::size_t n = asio::async_read_until(socket,
+ asio::dynamic_buffer(input_buffer), '\n',
+ close_after(std::chrono::seconds(10), socket));
+
+ std::string line(input_buffer.substr(0, n - 1));
+ input_buffer.erase(0, n);
+
+ // Keep going until we get back the line that was sent.
+ if (line == argv[3])
+ break;
+ }
+
+ auto time_received = std::chrono::steady_clock::now();
+
+ std::cout << "Round trip time: ";
+ std::cout << std::chrono::duration_cast<
+ std::chrono::microseconds>(
+ time_received - time_sent).count();
+ std::cout << " microseconds\n";
+ }
+ catch (std::exception& e)
+ {
+ std::cerr << "Exception: " << e.what() << "\n";
+ }
+
+ return 0;
+}