2 Copyright (C) 2013 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 <libcxml/cxml.h>
21 #include "server_finder.h"
22 #include "exceptions.h"
26 #include "ui_signaller.h"
29 using std::stringstream;
31 using boost::shared_ptr;
32 using boost::scoped_array;
34 ServerFinder* ServerFinder::_instance = 0;
36 ServerFinder::ServerFinder ()
37 : _broadcast_thread (0)
40 _broadcast_thread = new boost::thread (boost::bind (&ServerFinder::broadcast_thread, this));
41 _listen_thread = new boost::thread (boost::bind (&ServerFinder::listen_thread, this));
45 ServerFinder::broadcast_thread ()
47 boost::system::error_code error;
48 boost::asio::io_service io_service;
49 boost::asio::ip::udp::socket socket (io_service);
50 socket.open (boost::asio::ip::udp::v4(), error);
52 throw NetworkError ("failed to set up broadcast socket");
55 socket.set_option (boost::asio::ip::udp::socket::reuse_address (true));
56 socket.set_option (boost::asio::socket_base::broadcast (true));
58 boost::asio::ip::udp::endpoint end_point (boost::asio::ip::address_v4::broadcast(), Config::instance()->server_port_base() + 1);
61 string const data = DCPOMATIC_HELLO;
62 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
68 ServerFinder::listen_thread ()
71 shared_ptr<Socket> sock (new Socket (10));
74 sock->accept (Config::instance()->server_port_base() + 1);
75 } catch (std::exception& e) {
79 uint32_t length = sock->read_uint32 ();
80 scoped_array<char> buffer (new char[length]);
81 sock->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
83 stringstream s (buffer.get());
84 shared_ptr<cxml::Document> xml (new cxml::Document ("ServerAvailable"));
87 boost::mutex::scoped_lock lm (_mutex);
89 string const ip = sock->socket().remote_endpoint().address().to_string ();
90 list<ServerDescription>::const_iterator i = _servers.begin();
91 while (i != _servers.end() && i->host_name() != ip) {
95 if (i == _servers.end ()) {
96 ServerDescription sd (ip, xml->number_child<int> ("Threads"));
97 _servers.push_back (sd);
98 ui_signaller->emit (boost::bind (boost::ref (ServerFound), sd));
104 ServerFinder::connect (boost::function<void (ServerDescription)> fn)
106 boost::mutex::scoped_lock lm (_mutex);
108 /* Emit the current list of servers */
109 for (list<ServerDescription>::iterator i = _servers.begin(); i != _servers.end(); ++i) {
113 ServerFound.connect (fn);
117 ServerFinder::instance ()
120 _instance = new ServerFinder ();