summaryrefslogtreecommitdiffstatshomepage
path: root/3rdparty/asio/src/examples/cpp03/porthopper
diff options
context:
space:
mode:
Diffstat (limited to '3rdparty/asio/src/examples/cpp03/porthopper')
-rw-r--r--3rdparty/asio/src/examples/cpp03/porthopper/.gitignore11
-rw-r--r--3rdparty/asio/src/examples/cpp03/porthopper/client.cpp192
-rw-r--r--3rdparty/asio/src/examples/cpp03/porthopper/protocol.hpp156
-rw-r--r--3rdparty/asio/src/examples/cpp03/porthopper/server.cpp189
4 files changed, 548 insertions, 0 deletions
diff --git a/3rdparty/asio/src/examples/cpp03/porthopper/.gitignore b/3rdparty/asio/src/examples/cpp03/porthopper/.gitignore
new file mode 100644
index 00000000000..692ea7e7e65
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp03/porthopper/.gitignore
@@ -0,0 +1,11 @@
+.deps
+.dirstamp
+*.o
+*.obj
+*.exe
+client
+server
+*.ilk
+*.manifest
+*.pdb
+*.tds
diff --git a/3rdparty/asio/src/examples/cpp03/porthopper/client.cpp b/3rdparty/asio/src/examples/cpp03/porthopper/client.cpp
new file mode 100644
index 00000000000..15d8e4803c1
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp03/porthopper/client.cpp
@@ -0,0 +1,192 @@
+//
+// 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;
+}
diff --git a/3rdparty/asio/src/examples/cpp03/porthopper/protocol.hpp b/3rdparty/asio/src/examples/cpp03/porthopper/protocol.hpp
new file mode 100644
index 00000000000..c79bc6b49f4
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp03/porthopper/protocol.hpp
@@ -0,0 +1,156 @@
+//
+// protocol.hpp
+// ~~~~~~~~~~~~
+//
+// 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)
+//
+
+#ifndef PORTHOPPER_PROTOCOL_HPP
+#define PORTHOPPER_PROTOCOL_HPP
+
+#include <boost/array.hpp>
+#include <asio.hpp>
+#include <cstring>
+#include <iomanip>
+#include <string>
+#include <strstream>
+
+// This request is sent by the client to the server over a TCP connection.
+// The client uses it to perform three functions:
+// - To request that data start being sent to a given port.
+// - To request that data is no longer sent to a given port.
+// - To change the target port to another.
+class control_request
+{
+public:
+ // Construct an empty request. Used when receiving.
+ control_request()
+ {
+ }
+
+ // Create a request to start sending data to a given port.
+ static const control_request start(unsigned short port)
+ {
+ return control_request(0, port);
+ }
+
+ // Create a request to stop sending data to a given port.
+ static const control_request stop(unsigned short port)
+ {
+ return control_request(port, 0);
+ }
+
+ // Create a request to change the port that data is sent to.
+ static const control_request change(
+ unsigned short old_port, unsigned short new_port)
+ {
+ return control_request(old_port, new_port);
+ }
+
+ // Get the old port. Returns 0 for start requests.
+ unsigned short old_port() const
+ {
+ std::istrstream is(data_, encoded_port_size);
+ unsigned short port = 0;
+ is >> std::setw(encoded_port_size) >> std::hex >> port;
+ return port;
+ }
+
+ // Get the new port. Returns 0 for stop requests.
+ unsigned short new_port() const
+ {
+ std::istrstream is(data_ + encoded_port_size, encoded_port_size);
+ unsigned short port = 0;
+ is >> std::setw(encoded_port_size) >> std::hex >> port;
+ return port;
+ }
+
+ // Obtain buffers for reading from or writing to a socket.
+ boost::array<asio::mutable_buffer, 1> to_buffers()
+ {
+ boost::array<asio::mutable_buffer, 1> buffers
+ = { { asio::buffer(data_) } };
+ return buffers;
+ }
+
+private:
+ // Construct with specified old and new ports.
+ control_request(unsigned short old_port_number,
+ unsigned short new_port_number)
+ {
+ std::ostrstream os(data_, control_request_size);
+ os << std::setw(encoded_port_size) << std::hex << old_port_number;
+ os << std::setw(encoded_port_size) << std::hex << new_port_number;
+ }
+
+ // The length in bytes of a control_request and its components.
+ enum
+ {
+ encoded_port_size = 4, // 16-bit port in hex.
+ control_request_size = encoded_port_size * 2
+ };
+
+ // The encoded request data.
+ char data_[control_request_size];
+};
+
+// This frame is sent from the server to subscribed clients over UDP.
+class frame
+{
+public:
+ // The maximum allowable length of the payload.
+ enum { payload_size = 32 };
+
+ // Construct an empty frame. Used when receiving.
+ frame()
+ {
+ }
+
+ // Construct a frame with specified frame number and payload.
+ frame(unsigned long frame_number, const std::string& payload_data)
+ {
+ std::ostrstream os(data_, frame_size);
+ os << std::setw(encoded_number_size) << std::hex << frame_number;
+ os << std::setw(payload_size)
+ << std::setfill(' ') << payload_data.substr(0, payload_size);
+ }
+
+ // Get the frame number.
+ unsigned long number() const
+ {
+ std::istrstream is(data_, encoded_number_size);
+ unsigned long frame_number = 0;
+ is >> std::setw(encoded_number_size) >> std::hex >> frame_number;
+ return frame_number;
+ }
+
+ // Get the payload data.
+ const std::string payload() const
+ {
+ return std::string(data_ + encoded_number_size, payload_size);
+ }
+
+ // Obtain buffers for reading from or writing to a socket.
+ boost::array<asio::mutable_buffer, 1> to_buffers()
+ {
+ boost::array<asio::mutable_buffer, 1> buffers
+ = { { asio::buffer(data_) } };
+ return buffers;
+ }
+
+private:
+ // The length in bytes of a frame and its components.
+ enum
+ {
+ encoded_number_size = 8, // Frame number in hex.
+ frame_size = encoded_number_size + payload_size
+ };
+
+ // The encoded frame data.
+ char data_[frame_size];
+};
+
+#endif // PORTHOPPER_PROTOCOL_HPP
diff --git a/3rdparty/asio/src/examples/cpp03/porthopper/server.cpp b/3rdparty/asio/src/examples/cpp03/porthopper/server.cpp
new file mode 100644
index 00000000000..b98a7d4b24d
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp03/porthopper/server.cpp
@@ -0,0 +1,189 @@
+//
+// server.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/bind.hpp>
+#include <boost/shared_ptr.hpp>
+#include <cmath>
+#include <cstdlib>
+#include <exception>
+#include <iostream>
+#include <set>
+#include "protocol.hpp"
+
+using asio::ip::tcp;
+using asio::ip::udp;
+
+typedef boost::shared_ptr<tcp::socket> tcp_socket_ptr;
+typedef boost::shared_ptr<asio::deadline_timer> timer_ptr;
+typedef boost::shared_ptr<control_request> control_request_ptr;
+
+class server
+{
+public:
+ // Construct the server to wait for incoming control connections.
+ server(asio::io_context& io_context, unsigned short port)
+ : acceptor_(io_context, tcp::endpoint(tcp::v4(), port)),
+ timer_(io_context),
+ udp_socket_(io_context, udp::endpoint(udp::v4(), 0)),
+ next_frame_number_(1)
+ {
+ // Start waiting for a new control connection.
+ tcp_socket_ptr new_socket(
+ new tcp::socket(acceptor_.get_executor().context()));
+ acceptor_.async_accept(*new_socket,
+ boost::bind(&server::handle_accept, this,
+ asio::placeholders::error, new_socket));
+
+ // Start the timer used to generate outgoing frames.
+ timer_.expires_from_now(boost::posix_time::milliseconds(100));
+ timer_.async_wait(boost::bind(&server::handle_timer, this));
+ }
+
+ // Handle a new control connection.
+ void handle_accept(const asio::error_code& ec, tcp_socket_ptr socket)
+ {
+ if (!ec)
+ {
+ // Start receiving control requests on the connection.
+ control_request_ptr request(new control_request);
+ asio::async_read(*socket, request->to_buffers(),
+ boost::bind(&server::handle_control_request, this,
+ asio::placeholders::error, socket, request));
+ }
+
+ // Start waiting for a new control connection.
+ tcp_socket_ptr new_socket(
+ new tcp::socket(acceptor_.get_executor().context()));
+ acceptor_.async_accept(*new_socket,
+ boost::bind(&server::handle_accept, this,
+ asio::placeholders::error, new_socket));
+ }
+
+ // Handle a new control request.
+ void handle_control_request(const asio::error_code& ec,
+ tcp_socket_ptr socket, control_request_ptr request)
+ {
+ if (!ec)
+ {
+ // Delay handling of the control request to simulate network latency.
+ timer_ptr delay_timer(
+ new asio::deadline_timer(acceptor_.get_executor().context()));
+ delay_timer->expires_from_now(boost::posix_time::seconds(2));
+ delay_timer->async_wait(
+ boost::bind(&server::handle_control_request_timer, this,
+ socket, request, delay_timer));
+ }
+ }
+
+ void handle_control_request_timer(tcp_socket_ptr socket,
+ control_request_ptr request, timer_ptr /*delay_timer*/)
+ {
+ // Determine what address this client is connected from, since
+ // subscriptions must be stored on the server as a complete endpoint, not
+ // just a port. We use the non-throwing overload of remote_endpoint() since
+ // it may fail if the socket is no longer connected.
+ asio::error_code ec;
+ tcp::endpoint remote_endpoint = socket->remote_endpoint(ec);
+ if (!ec)
+ {
+ // Remove old port subscription, if any.
+ if (unsigned short old_port = request->old_port())
+ {
+ udp::endpoint old_endpoint(remote_endpoint.address(), old_port);
+ subscribers_.erase(old_endpoint);
+ std::cout << "Removing subscription " << old_endpoint << std::endl;
+ }
+
+ // Add new port subscription, if any.
+ if (unsigned short new_port = request->new_port())
+ {
+ udp::endpoint new_endpoint(remote_endpoint.address(), new_port);
+ subscribers_.insert(new_endpoint);
+ std::cout << "Adding subscription " << new_endpoint << std::endl;
+ }
+ }
+
+ // Wait for next control request on this connection.
+ asio::async_read(*socket, request->to_buffers(),
+ boost::bind(&server::handle_control_request, this,
+ asio::placeholders::error, socket, request));
+ }
+
+ // Every time the timer fires we will generate a new frame and send it to all
+ // subscribers.
+ void handle_timer()
+ {
+ // Generate payload.
+ double x = next_frame_number_ * 0.2;
+ double y = std::sin(x);
+ int char_index = static_cast<int>((y + 1.0) * (frame::payload_size / 2));
+ std::string payload;
+ for (int i = 0; i < frame::payload_size; ++i)
+ payload += (i == char_index ? '*' : '.');
+
+ // Create the frame to be sent to all subscribers.
+ frame f(next_frame_number_++, payload);
+
+ // Send frame to all subscribers. We can use synchronous calls here since
+ // UDP send operations typically do not block.
+ std::set<udp::endpoint>::iterator j;
+ for (j = subscribers_.begin(); j != subscribers_.end(); ++j)
+ {
+ asio::error_code ec;
+ udp_socket_.send_to(f.to_buffers(), *j, 0, ec);
+ }
+
+ // Wait for next timeout.
+ timer_.expires_from_now(boost::posix_time::milliseconds(100));
+ timer_.async_wait(boost::bind(&server::handle_timer, this));
+ }
+
+private:
+ // The acceptor used to accept incoming control connections.
+ tcp::acceptor acceptor_;
+
+ // The timer used for generating data.
+ asio::deadline_timer timer_;
+
+ // The socket used to send data to subscribers.
+ udp::socket udp_socket_;
+
+ // The next frame number.
+ unsigned long next_frame_number_;
+
+ // The set of endpoints that are subscribed.
+ std::set<udp::endpoint> subscribers_;
+};
+
+int main(int argc, char* argv[])
+{
+ try
+ {
+ if (argc != 2)
+ {
+ std::cerr << "Usage: server <port>\n";
+ return 1;
+ }
+
+ asio::io_context io_context;
+
+ using namespace std; // For atoi.
+ server s(io_context, atoi(argv[1]));
+
+ io_context.run();
+ }
+ catch (std::exception& e)
+ {
+ std::cerr << "Exception: " << e.what() << std::endl;
+ }
+
+ return 0;
+}