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author Justin Kerk <dopefishjustin@gmail.com>2020-05-22 23:49:41 -0700
committer Justin Kerk <dopefishjustin@gmail.com>2020-05-22 23:49:41 -0700
commitd9138cb8e0c877478c6da076a737d64fde57597d (patch)
tree97e4466f78bb8ecaec4d88d6687c0b1c7be51210 /3rdparty
parent4c2424c805b22b6aa828735db52eb243b19c808e (diff)
rv unintentional change (nw)
Diffstat (limited to '3rdparty')
-rw-r--r--3rdparty/asio/src/examples/cpp03/timeouts/blocking_tcp_client.cpp242
1 files changed, 242 insertions, 0 deletions
diff --git a/3rdparty/asio/src/examples/cpp03/timeouts/blocking_tcp_client.cpp b/3rdparty/asio/src/examples/cpp03/timeouts/blocking_tcp_client.cpp
new file mode 100644
index 00000000000..69d467af1bb
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp03/timeouts/blocking_tcp_client.cpp
@@ -0,0 +1,242 @@
+//
+// blocking_tcp_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/connect.hpp"
+#include "asio/deadline_timer.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 "asio/thread.hpp"
+#include <cstdlib>
+#include <iostream>
+#include <string>
+#include <boost/lambda/bind.hpp>
+#include <boost/lambda/lambda.hpp>
+
+using asio::deadline_timer;
+using asio::ip::tcp;
+using boost::lambda::bind;
+using boost::lambda::var;
+using boost::lambda::_1;
+
+//----------------------------------------------------------------------
+
+//
+// This class manages socket timeouts by applying the concept of a deadline.
+// Each asynchronous operation is given a deadline by which it must complete.
+// Deadlines are enforced by an "actor" that persists for the lifetime of the
+// client object:
+//
+// +----------------+
+// | |
+// | check_deadline |<---+
+// | | |
+// +----------------+ | async_wait()
+// | |
+// +---------+
+//
+// If the actor determines that the deadline has expired, the socket is closed
+// and any outstanding operations are consequently cancelled. The socket
+// operations themselves use boost::lambda function objects as completion
+// handlers. For a given socket operation, the client object runs the
+// io_context to block thread execution until the actor completes.
+//
+class client
+{
+public:
+ client()
+ : socket_(io_context_),
+ deadline_(io_context_)
+ {
+ // No deadline is required until the first socket operation is started. We
+ // set the deadline to positive infinity so that the actor takes no action
+ // until a specific deadline is set.
+ deadline_.expires_at(boost::posix_time::pos_infin);
+
+ // Start the persistent actor that checks for deadline expiry.
+ check_deadline();
+ }
+
+ void connect(const std::string& host, const std::string& service,
+ boost::posix_time::time_duration timeout)
+ {
+ // Resolve the host name and service to a list of endpoints.
+ tcp::resolver::results_type endpoints =
+ tcp::resolver(io_context_).resolve(host, service);
+
+ // Set a deadline for the asynchronous operation. As a host name may
+ // resolve to multiple endpoints, this function uses the composed operation
+ // async_connect. The deadline applies to the entire operation, rather than
+ // individual connection attempts.
+ deadline_.expires_from_now(timeout);
+
+ // Set up the variable that receives the result of the asynchronous
+ // operation. The error code is set to would_block to signal that the
+ // operation is incomplete. Asio guarantees that its asynchronous
+ // operations will never fail with would_block, so any other value in
+ // ec indicates completion.
+ asio::error_code ec = asio::error::would_block;
+
+ // Start the asynchronous operation itself. The boost::lambda function
+ // object is used as a callback and will update the ec variable when the
+ // operation completes. The blocking_udp_client.cpp example shows how you
+ // can use boost::bind rather than boost::lambda.
+ asio::async_connect(socket_, endpoints, var(ec) = _1);
+
+ // Block until the asynchronous operation has completed.
+ do io_context_.run_one(); while (ec == asio::error::would_block);
+
+ // Determine whether a connection was successfully established. The
+ // deadline actor may have had a chance to run and close our socket, even
+ // though the connect operation notionally succeeded. Therefore we must
+ // check whether the socket is still open before deciding if we succeeded
+ // or failed.
+ if (ec || !socket_.is_open())
+ throw asio::system_error(
+ ec ? ec : asio::error::operation_aborted);
+ }
+
+ std::string read_line(boost::posix_time::time_duration timeout)
+ {
+ // Set a deadline for the asynchronous operation. Since this function uses
+ // a composed operation (async_read_until), the deadline applies to the
+ // entire operation, rather than individual reads from the socket.
+ deadline_.expires_from_now(timeout);
+
+ // Set up the variable that receives the result of the asynchronous
+ // operation. The error code is set to would_block to signal that the
+ // operation is incomplete. Asio guarantees that its asynchronous
+ // operations will never fail with would_block, so any other value in
+ // ec indicates completion.
+ asio::error_code ec = asio::error::would_block;
+
+ // Start the asynchronous operation itself. The boost::lambda function
+ // object is used as a callback and will update the ec variable when the
+ // operation completes. The blocking_udp_client.cpp example shows how you
+ // can use boost::bind rather than boost::lambda.
+ asio::async_read_until(socket_, input_buffer_, '\n', var(ec) = _1);
+
+ // Block until the asynchronous operation has completed.
+ do io_context_.run_one(); while (ec == asio::error::would_block);
+
+ if (ec)
+ throw asio::system_error(ec);
+
+ std::string line;
+ std::istream is(&input_buffer_);
+ std::getline(is, line);
+ return line;
+ }
+
+ void write_line(const std::string& line,
+ boost::posix_time::time_duration timeout)
+ {
+ std::string data = line + "\n";
+
+ // Set a deadline for the asynchronous operation. Since this function uses
+ // a composed operation (async_write), the deadline applies to the entire
+ // operation, rather than individual writes to the socket.
+ deadline_.expires_from_now(timeout);
+
+ // Set up the variable that receives the result of the asynchronous
+ // operation. The error code is set to would_block to signal that the
+ // operation is incomplete. Asio guarantees that its asynchronous
+ // operations will never fail with would_block, so any other value in
+ // ec indicates completion.
+ asio::error_code ec = asio::error::would_block;
+
+ // Start the asynchronous operation itself. The boost::lambda function
+ // object is used as a callback and will update the ec variable when the
+ // operation completes. The blocking_udp_client.cpp example shows how you
+ // can use boost::bind rather than boost::lambda.
+ asio::async_write(socket_, asio::buffer(data), var(ec) = _1);
+
+ // Block until the asynchronous operation has completed.
+ do io_context_.run_one(); while (ec == asio::error::would_block);
+
+ if (ec)
+ throw asio::system_error(ec);
+ }
+
+private:
+ void check_deadline()
+ {
+ // Check whether the deadline has passed. We compare the deadline against
+ // the current time since a new asynchronous operation may have moved the
+ // deadline before this actor had a chance to run.
+ if (deadline_.expires_at() <= deadline_timer::traits_type::now())
+ {
+ // The deadline has passed. The socket is closed so that any outstanding
+ // asynchronous operations are cancelled. This allows the blocked
+ // connect(), read_line() or write_line() functions to return.
+ asio::error_code ignored_ec;
+ socket_.close(ignored_ec);
+
+ // There is no longer an active deadline. The expiry is set to positive
+ // infinity so that the actor takes no action until a new deadline is set.
+ deadline_.expires_at(boost::posix_time::pos_infin);
+ }
+
+ // Put the actor back to sleep.
+ deadline_.async_wait(bind(&client::check_deadline, this));
+ }
+
+ asio::io_context io_context_;
+ tcp::socket socket_;
+ deadline_timer deadline_;
+ asio::streambuf input_buffer_;
+};
+
+//----------------------------------------------------------------------
+
+int main(int argc, char* argv[])
+{
+ try
+ {
+ if (argc != 4)
+ {
+ std::cerr << "Usage: blocking_tcp <host> <port> <message>\n";
+ return 1;
+ }
+
+ client c;
+ c.connect(argv[1], argv[2], boost::posix_time::seconds(10));
+
+ boost::posix_time::ptime time_sent =
+ boost::posix_time::microsec_clock::universal_time();
+
+ c.write_line(argv[3], boost::posix_time::seconds(10));
+
+ for (;;)
+ {
+ std::string line = c.read_line(boost::posix_time::seconds(10));
+
+ // Keep going until we get back the line that was sent.
+ if (line == argv[3])
+ break;
+ }
+
+ boost::posix_time::ptime time_received =
+ boost::posix_time::microsec_clock::universal_time();
+
+ std::cout << "Round trip time: ";
+ std::cout << (time_received - time_sent).total_microseconds();
+ std::cout << " microseconds\n";
+ }
+ catch (std::exception& e)
+ {
+ std::cerr << "Exception: " << e.what() << "\n";
+ }
+
+ return 0;
+}