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 <dcp/raw_convert.h>
22 #include "server_finder.h"
23 #include "exceptions.h"
27 #include "ui_signaller.h"
35 using boost::shared_ptr;
36 using boost::scoped_array;
37 using dcp::raw_convert;
39 ServerFinder* ServerFinder::_instance = 0;
41 ServerFinder::ServerFinder ()
43 , _broadcast_thread (0)
46 _broadcast_thread = new boost::thread (boost::bind (&ServerFinder::broadcast_thread, this));
47 _listen_thread = new boost::thread (boost::bind (&ServerFinder::listen_thread, this));
51 ServerFinder::broadcast_thread ()
54 boost::system::error_code error;
55 boost::asio::io_service io_service;
56 boost::asio::ip::udp::socket socket (io_service);
57 socket.open (boost::asio::ip::udp::v4(), error);
59 throw NetworkError ("failed to set up broadcast socket");
62 socket.set_option (boost::asio::ip::udp::socket::reuse_address (true));
63 socket.set_option (boost::asio::socket_base::broadcast (true));
65 string const data = DCPOMATIC_HELLO;
68 if (Config::instance()->use_any_servers ()) {
69 /* Broadcast to look for servers */
71 boost::asio::ip::udp::endpoint end_point (boost::asio::ip::address_v4::broadcast(), Config::instance()->server_port_base() + 1);
72 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
78 /* Query our `definite' servers (if there are any) */
79 vector<string> servers = Config::instance()->servers ();
80 for (vector<string>::const_iterator i = servers.begin(); i != servers.end(); ++i) {
81 if (server_found (*i)) {
82 /* Don't bother asking a server that we already know about */
86 boost::asio::ip::udp::resolver resolver (io_service);
87 boost::asio::ip::udp::resolver::query query (*i, raw_convert<string> (Config::instance()->server_port_base() + 1));
88 boost::asio::ip::udp::endpoint end_point (*resolver.resolve (query));
89 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
104 ServerFinder::listen_thread ()
107 using namespace boost::asio::ip;
109 boost::asio::io_service io_service;
110 boost::scoped_ptr<tcp::acceptor> acceptor;
112 acceptor.reset (new tcp::acceptor (io_service, tcp::endpoint (tcp::v4(), Config::instance()->server_port_base() + 1)));
114 boost::throw_exception (NetworkError (_("Could not listen for remote encode servers. Perhaps another instance of DCP-o-matic is running.")));
118 tcp::socket socket (io_service);
119 acceptor->accept (socket);
121 /* XXX: these reads should have timeouts, otherwise we will stop finding servers
122 if one dies during this conversation
126 boost::asio::read (socket, boost::asio::buffer (&length, sizeof (uint32_t)));
127 length = ntohl (length);
129 scoped_array<char> buffer (new char[length]);
130 boost::asio::read (socket, boost::asio::buffer (reinterpret_cast<uint8_t*> (buffer.get ()), length));
132 string s (buffer.get());
133 shared_ptr<cxml::Document> xml (new cxml::Document ("ServerAvailable"));
134 xml->read_string (s);
136 string const ip = socket.remote_endpoint().address().to_string ();
137 if (!server_found (ip)) {
138 ServerDescription sd (ip, xml->number_child<int> ("Threads"));
139 _servers.push_back (sd);
140 ui_signaller->emit (boost::bind (boost::ref (ServerFound), sd));
150 ServerFinder::server_found (string ip) const
152 boost::mutex::scoped_lock lm (_mutex);
153 list<ServerDescription>::const_iterator i = _servers.begin();
154 while (i != _servers.end() && i->host_name() != ip) {
158 return i != _servers.end ();
162 ServerFinder::connect (boost::function<void (ServerDescription)> fn)
168 boost::mutex::scoped_lock lm (_mutex);
170 /* Emit the current list of servers */
171 for (list<ServerDescription>::iterator i = _servers.begin(); i != _servers.end(); ++i) {
175 ServerFound.connect (fn);
179 ServerFinder::instance ()
182 _instance = new ServerFinder ();