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 "dcpomatic_socket.h"
26 #include "raw_convert.h"
27 #include <libcxml/cxml.h>
28 #include <boost/lambda/lambda.hpp>
36 using boost::shared_ptr;
37 using boost::scoped_array;
38 using boost::weak_ptr;
40 ServerFinder* ServerFinder::_instance = 0;
42 ServerFinder::ServerFinder ()
44 , _broadcast_thread (0)
48 _broadcast_thread = new boost::thread (boost::bind (&ServerFinder::broadcast_thread, this));
49 _listen_thread = new boost::thread (boost::bind (&ServerFinder::listen_thread, this));
52 ServerFinder::~ServerFinder ()
56 _broadcast_thread->interrupt ();
57 _broadcast_thread->join ();
59 _listen_io_service.stop ();
60 _listen_thread->join ();
64 ServerFinder::broadcast_thread ()
67 boost::system::error_code error;
68 boost::asio::io_service io_service;
69 boost::asio::ip::udp::socket socket (io_service);
70 socket.open (boost::asio::ip::udp::v4(), error);
72 throw NetworkError ("failed to set up broadcast socket");
75 socket.set_option (boost::asio::ip::udp::socket::reuse_address (true));
76 socket.set_option (boost::asio::socket_base::broadcast (true));
78 string const data = DCPOMATIC_HELLO;
81 if (Config::instance()->use_any_servers ()) {
82 /* Broadcast to look for servers */
84 boost::asio::ip::udp::endpoint end_point (boost::asio::ip::address_v4::broadcast(), Config::instance()->server_port_base() + 1);
85 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
91 /* Query our `definite' servers (if there are any) */
92 vector<string> servers = Config::instance()->servers ();
93 for (vector<string>::const_iterator i = servers.begin(); i != servers.end(); ++i) {
94 if (server_found (*i)) {
95 /* Don't bother asking a server that we already know about */
99 boost::asio::ip::udp::resolver resolver (io_service);
100 boost::asio::ip::udp::resolver::query query (*i, raw_convert<string> (Config::instance()->server_port_base() + 1));
101 boost::asio::ip::udp::endpoint end_point (*resolver.resolve (query));
102 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
109 boost::thread::sleep (boost::get_system_time() + boost::posix_time::seconds (10));
110 } catch (boost::thread_interrupted& e) {
121 ServerFinder::listen_thread ()
123 using namespace boost::asio::ip;
126 _listen_acceptor.reset (new tcp::acceptor (_listen_io_service, tcp::endpoint (tcp::v4(), Config::instance()->server_port_base() + 1)));
128 boost::throw_exception (NetworkError (_("Could not listen for remote encode servers. Perhaps another instance of DCP-o-matic is running.")));
132 _listen_io_service.run ();
140 ServerFinder::start_accept ()
142 shared_ptr<Socket> socket (new Socket ());
143 _listen_acceptor->async_accept (
145 boost::bind (&ServerFinder::handle_accept, this, boost::asio::placeholders::error, socket)
150 ServerFinder::handle_accept (boost::system::error_code ec, shared_ptr<Socket> socket)
158 socket->read (reinterpret_cast<uint8_t*> (&length), sizeof (uint32_t));
159 length = ntohl (length);
161 scoped_array<char> buffer (new char[length]);
162 socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
164 string s (buffer.get());
165 shared_ptr<cxml::Document> xml (new cxml::Document ("ServerAvailable"));
166 xml->read_string (s);
168 string const ip = socket->socket().remote_endpoint().address().to_string ();
169 if (!server_found (ip) && xml->optional_number_child<int>("Version").get_value_or (0) == SERVER_LINK_VERSION) {
170 ServerDescription sd (ip, xml->number_child<int> ("Threads"));
172 boost::mutex::scoped_lock lm (_mutex);
173 _servers.push_back (sd);
175 emit (boost::bind (boost::ref (ServerFound), sd));
182 ServerFinder::server_found (string ip) const
184 boost::mutex::scoped_lock lm (_mutex);
185 list<ServerDescription>::const_iterator i = _servers.begin();
186 while (i != _servers.end() && i->host_name() != ip) {
190 return i != _servers.end ();
193 boost::signals2::connection
194 ServerFinder::connect (boost::function<void (ServerDescription)> fn)
196 boost::mutex::scoped_lock lm (_mutex);
198 /* Emit the current list of servers */
199 for (list<ServerDescription>::iterator i = _servers.begin(); i != _servers.end(); ++i) {
203 return ServerFound.connect (fn);
207 ServerFinder::instance ()
210 _instance = new ServerFinder ();
217 ServerFinder::drop ()