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 ()
48 _search_thread = new boost::thread (boost::bind (&ServerFinder::search_thread, this));
49 _listen_thread = new boost::thread (boost::bind (&ServerFinder::listen_thread, this));
50 Config::instance()->Changed.connect (boost::bind (&ServerFinder::config_changed, this, _1));
53 ServerFinder::~ServerFinder ()
57 _search_condition.notify_all ();
58 _search_thread->join ();
60 _listen_io_service.stop ();
61 _listen_thread->join ();
65 ServerFinder::search_thread ()
68 boost::system::error_code error;
69 boost::asio::io_service io_service;
70 boost::asio::ip::udp::socket socket (io_service);
71 socket.open (boost::asio::ip::udp::v4(), error);
73 throw NetworkError ("failed to set up broadcast socket");
76 socket.set_option (boost::asio::ip::udp::socket::reuse_address (true));
77 socket.set_option (boost::asio::socket_base::broadcast (true));
79 string const data = DCPOMATIC_HELLO;
82 if (Config::instance()->use_any_servers ()) {
83 /* Broadcast to look for servers */
85 boost::asio::ip::udp::endpoint end_point (boost::asio::ip::address_v4::broadcast(), Config::instance()->server_port_base() + 1);
86 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
92 /* Query our `definite' servers (if there are any) */
93 vector<string> servers = Config::instance()->servers ();
94 for (vector<string>::const_iterator i = servers.begin(); i != servers.end(); ++i) {
95 if (server_found (*i)) {
96 /* Don't bother asking a server that we already know about */
100 boost::asio::ip::udp::resolver resolver (io_service);
101 boost::asio::ip::udp::resolver::query query (*i, raw_convert<string> (Config::instance()->server_port_base() + 1));
102 boost::asio::ip::udp::endpoint end_point (*resolver.resolve (query));
103 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
109 boost::mutex::scoped_lock lm (_search_condition_mutex);
110 _search_condition.timed_wait (lm, boost::get_system_time() + boost::posix_time::seconds (10));
119 ServerFinder::listen_thread ()
121 using namespace boost::asio::ip;
124 _listen_acceptor.reset (new tcp::acceptor (_listen_io_service, tcp::endpoint (tcp::v4(), Config::instance()->server_port_base() + 1)));
126 boost::throw_exception (NetworkError (_("Could not listen for remote encode servers. Perhaps another instance of DCP-o-matic is running.")));
130 _listen_io_service.run ();
138 ServerFinder::start_accept ()
140 shared_ptr<Socket> socket (new Socket ());
141 _listen_acceptor->async_accept (
143 boost::bind (&ServerFinder::handle_accept, this, boost::asio::placeholders::error, socket)
148 ServerFinder::handle_accept (boost::system::error_code ec, shared_ptr<Socket> socket)
156 socket->read (reinterpret_cast<uint8_t*> (&length), sizeof (uint32_t));
157 length = ntohl (length);
159 scoped_array<char> buffer (new char[length]);
160 socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
162 string s (buffer.get());
163 shared_ptr<cxml::Document> xml (new cxml::Document ("ServerAvailable"));
164 xml->read_string (s);
166 string const ip = socket->socket().remote_endpoint().address().to_string ();
167 if (!server_found (ip) && xml->optional_number_child<int>("Version").get_value_or (0) == SERVER_LINK_VERSION) {
168 ServerDescription sd (ip, xml->number_child<int> ("Threads"));
170 boost::mutex::scoped_lock lm (_mutex);
171 _servers.push_back (sd);
173 emit (boost::bind (boost::ref (ServersListChanged)));
180 ServerFinder::server_found (string ip) const
182 boost::mutex::scoped_lock lm (_mutex);
183 list<ServerDescription>::const_iterator i = _servers.begin();
184 while (i != _servers.end() && i->host_name() != ip) {
188 return i != _servers.end ();
192 ServerFinder::instance ()
195 _instance = new ServerFinder ();
202 ServerFinder::drop ()
208 list<ServerDescription>
209 ServerFinder::servers () const
211 boost::mutex::scoped_lock lm (_mutex);
216 ServerFinder::config_changed (Config::Property what)
218 if (what == Config::USE_ANY_SERVERS || what == Config::SERVERS) {
220 boost::mutex::scoped_lock lm (_mutex);
223 ServersListChanged ();
229 ServerFinder::search_now ()
231 _search_condition.notify_all ();