2 Copyright (C) 2013-2014 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 <libdcp/raw_convert.h>
22 #include "server_finder.h"
23 #include "exceptions.h"
27 #include "ui_signaller.h"
30 using std::stringstream;
34 using boost::shared_ptr;
35 using boost::scoped_array;
36 using libdcp::raw_convert;
38 ServerFinder* ServerFinder::_instance = 0;
40 ServerFinder::ServerFinder ()
42 , _broadcast_thread (0)
45 _broadcast_thread = new boost::thread (boost::bind (&ServerFinder::broadcast_thread, this));
46 _listen_thread = new boost::thread (boost::bind (&ServerFinder::listen_thread, this));
50 ServerFinder::broadcast_thread ()
53 boost::system::error_code error;
54 boost::asio::io_service io_service;
55 boost::asio::ip::udp::socket socket (io_service);
56 socket.open (boost::asio::ip::udp::v4(), error);
58 throw NetworkError ("failed to set up broadcast socket");
61 socket.set_option (boost::asio::ip::udp::socket::reuse_address (true));
62 socket.set_option (boost::asio::socket_base::broadcast (true));
64 string const data = DCPOMATIC_HELLO;
67 if (Config::instance()->use_any_servers ()) {
68 /* Broadcast to look for servers */
70 boost::asio::ip::udp::endpoint end_point (boost::asio::ip::address_v4::broadcast(), Config::instance()->server_port_base() + 1);
71 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
77 /* Query our `definite' servers (if there are any) */
78 vector<string> servers = Config::instance()->servers ();
79 for (vector<string>::const_iterator i = servers.begin(); i != servers.end(); ++i) {
80 if (server_found (*i)) {
81 /* Don't bother asking a server that we already know about */
85 boost::asio::ip::udp::resolver resolver (io_service);
86 boost::asio::ip::udp::resolver::query query (*i, raw_convert<string> (Config::instance()->server_port_base() + 1));
87 boost::asio::ip::udp::endpoint end_point (*resolver.resolve (query));
88 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
103 ServerFinder::listen_thread ()
107 shared_ptr<Socket> sock (new Socket (60));
110 sock->accept (Config::instance()->server_port_base() + 1);
111 } catch (std::exception& e) {
115 uint32_t length = sock->read_uint32 ();
116 scoped_array<char> buffer (new char[length]);
117 sock->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
119 stringstream s (buffer.get());
120 shared_ptr<cxml::Document> xml (new cxml::Document ("ServerAvailable"));
121 xml->read_stream (s);
123 string const ip = sock->socket().remote_endpoint().address().to_string ();
124 if (!server_found (ip)) {
125 ServerDescription sd (ip, xml->number_child<int> ("Threads"));
126 _servers.push_back (sd);
127 ui_signaller->emit (boost::bind (boost::ref (ServerFound), sd));
137 ServerFinder::server_found (string ip) const
139 boost::mutex::scoped_lock lm (_mutex);
140 list<ServerDescription>::const_iterator i = _servers.begin();
141 while (i != _servers.end() && i->host_name() != ip) {
145 return i != _servers.end ();
149 ServerFinder::connect (boost::function<void (ServerDescription)> fn)
155 boost::mutex::scoped_lock lm (_mutex);
157 /* Emit the current list of servers */
158 for (list<ServerDescription>::iterator i = _servers.begin(); i != _servers.end(); ++i) {
162 ServerFound.connect (fn);
166 ServerFinder::instance ()
169 _instance = new ServerFinder ();