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;
33 using boost::shared_ptr;
34 using boost::scoped_array;
35 using boost::lexical_cast;
37 ServerFinder* ServerFinder::_instance = 0;
39 ServerFinder::ServerFinder ()
41 , _broadcast_thread (0)
44 _broadcast_thread = new boost::thread (boost::bind (&ServerFinder::broadcast_thread, this));
45 _listen_thread = new boost::thread (boost::bind (&ServerFinder::listen_thread, this));
49 ServerFinder::broadcast_thread ()
51 boost::system::error_code error;
52 boost::asio::io_service io_service;
53 boost::asio::ip::udp::socket socket (io_service);
54 socket.open (boost::asio::ip::udp::v4(), error);
56 throw NetworkError ("failed to set up broadcast socket");
59 socket.set_option (boost::asio::ip::udp::socket::reuse_address (true));
60 socket.set_option (boost::asio::socket_base::broadcast (true));
62 string const data = DCPOMATIC_HELLO;
65 if (Config::instance()->use_any_servers ()) {
66 /* Broadcast to look for servers */
67 boost::asio::ip::udp::endpoint end_point (boost::asio::ip::address_v4::broadcast(), Config::instance()->server_port_base() + 1);
68 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
71 /* Query our `definite' servers (if there are any) */
72 vector<string> servers = Config::instance()->servers ();
73 for (vector<string>::const_iterator i = servers.begin(); i != servers.end(); ++i) {
74 if (server_found (*i)) {
75 /* Don't bother asking a server that we already know about */
79 boost::asio::ip::udp::resolver resolver (io_service);
80 boost::asio::ip::udp::resolver::query query (*i, lexical_cast<string> (Config::instance()->server_port_base() + 1));
81 boost::asio::ip::udp::endpoint end_point (*resolver.resolve (query));
82 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
93 ServerFinder::listen_thread ()
96 shared_ptr<Socket> sock (new Socket (10));
99 sock->accept (Config::instance()->server_port_base() + 1);
100 } catch (std::exception& e) {
104 uint32_t length = sock->read_uint32 ();
105 scoped_array<char> buffer (new char[length]);
106 sock->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
108 stringstream s (buffer.get());
109 shared_ptr<cxml::Document> xml (new cxml::Document ("ServerAvailable"));
110 xml->read_stream (s);
112 string const ip = sock->socket().remote_endpoint().address().to_string ();
113 if (!server_found (ip)) {
114 ServerDescription sd (ip, xml->number_child<int> ("Threads"));
115 _servers.push_back (sd);
116 ui_signaller->emit (boost::bind (boost::ref (ServerFound), sd));
122 ServerFinder::server_found (string ip) const
124 boost::mutex::scoped_lock lm (_mutex);
125 list<ServerDescription>::const_iterator i = _servers.begin();
126 while (i != _servers.end() && i->host_name() != ip) {
130 return i != _servers.end ();
134 ServerFinder::connect (boost::function<void (ServerDescription)> fn)
140 boost::mutex::scoped_lock lm (_mutex);
142 /* Emit the current list of servers */
143 for (list<ServerDescription>::iterator i = _servers.begin(); i != _servers.end(); ++i) {
147 ServerFound.connect (fn);
151 ServerFinder::instance ()
154 _instance = new ServerFinder ();