2 Copyright (C) 2013-2015 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #include "server_finder.h"
21 #include "exceptions.h"
25 #include "ui_signaller.h"
26 #include "dcpomatic_socket.h"
27 #include "raw_convert.h"
28 #include <libcxml/cxml.h>
29 #include <boost/lambda/lambda.hpp>
37 using boost::shared_ptr;
38 using boost::scoped_array;
39 using boost::weak_ptr;
41 ServerFinder* ServerFinder::_instance = 0;
43 ServerFinder::ServerFinder ()
45 , _broadcast_thread (0)
49 _broadcast_thread = new boost::thread (boost::bind (&ServerFinder::broadcast_thread, this));
50 _listen_thread = new boost::thread (boost::bind (&ServerFinder::listen_thread, this));
53 ServerFinder::~ServerFinder ()
57 _broadcast_thread->interrupt ();
58 _broadcast_thread->join ();
60 _listen_io_service.stop ();
61 _listen_thread->join ();
65 ServerFinder::broadcast_thread ()
68 boost::system::error_code error;
69 boost::asio::io_service io_service;
70 boost::asio::ip::udp::socket socket (io_service);
71 socket.open (boost::asio::ip::udp::v4(), error);
73 throw NetworkError ("failed to set up broadcast socket");
76 socket.set_option (boost::asio::ip::udp::socket::reuse_address (true));
77 socket.set_option (boost::asio::socket_base::broadcast (true));
79 string const data = DCPOMATIC_HELLO;
82 if (Config::instance()->use_any_servers ()) {
83 /* Broadcast to look for servers */
85 boost::asio::ip::udp::endpoint end_point (boost::asio::ip::address_v4::broadcast(), Config::instance()->server_port_base() + 1);
86 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
92 /* Query our `definite' servers (if there are any) */
93 vector<string> servers = Config::instance()->servers ();
94 for (vector<string>::const_iterator i = servers.begin(); i != servers.end(); ++i) {
95 if (server_found (*i)) {
96 /* Don't bother asking a server that we already know about */
100 boost::asio::ip::udp::resolver resolver (io_service);
101 boost::asio::ip::udp::resolver::query query (*i, raw_convert<string> (Config::instance()->server_port_base() + 1));
102 boost::asio::ip::udp::endpoint end_point (*resolver.resolve (query));
103 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
110 boost::thread::sleep (boost::get_system_time() + boost::posix_time::seconds (10));
111 } catch (boost::thread_interrupted& e) {
122 ServerFinder::listen_thread ()
124 using namespace boost::asio::ip;
127 _listen_acceptor.reset (new tcp::acceptor (_listen_io_service, tcp::endpoint (tcp::v4(), Config::instance()->server_port_base() + 1)));
129 boost::throw_exception (NetworkError (_("Could not listen for remote encode servers. Perhaps another instance of DCP-o-matic is running.")));
133 _listen_io_service.run ();
141 ServerFinder::start_accept ()
143 shared_ptr<Socket> socket (new Socket ());
144 _listen_acceptor->async_accept (
146 boost::bind (&ServerFinder::handle_accept, this, boost::asio::placeholders::error, socket)
151 ServerFinder::handle_accept (boost::system::error_code ec, shared_ptr<Socket> socket)
159 socket->read (reinterpret_cast<uint8_t*> (&length), sizeof (uint32_t));
160 length = ntohl (length);
162 scoped_array<char> buffer (new char[length]);
163 socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
165 string s (buffer.get());
166 shared_ptr<cxml::Document> xml (new cxml::Document ("ServerAvailable"));
167 xml->read_string (s);
169 string const ip = socket->socket().remote_endpoint().address().to_string ();
170 if (!server_found (ip)) {
171 ServerDescription sd (ip, xml->number_child<int> ("Threads"));
173 boost::mutex::scoped_lock lm (_mutex);
174 _servers.push_back (sd);
176 ui_signaller->emit (boost::bind (boost::ref (ServerFound), sd));
183 ServerFinder::server_found (string ip) const
185 boost::mutex::scoped_lock lm (_mutex);
186 list<ServerDescription>::const_iterator i = _servers.begin();
187 while (i != _servers.end() && i->host_name() != ip) {
191 return i != _servers.end ();
194 boost::signals2::connection
195 ServerFinder::connect (boost::function<void (ServerDescription)> fn)
197 boost::mutex::scoped_lock lm (_mutex);
199 /* Emit the current list of servers */
200 for (list<ServerDescription>::iterator i = _servers.begin(); i != _servers.end(); ++i) {
204 return ServerFound.connect (fn);
208 ServerFinder::instance ()
211 _instance = new ServerFinder ();
218 ServerFinder::drop ()