2 Copyright (C) 2013-2015 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
21 #include "encode_server_finder.h"
22 #include "exceptions.h"
26 #include "encode_server_description.h"
27 #include "dcpomatic_socket.h"
28 #include "raw_convert.h"
29 #include <libcxml/cxml.h>
30 #include <boost/lambda/lambda.hpp>
39 using boost::shared_ptr;
40 using boost::scoped_array;
41 using boost::weak_ptr;
43 EncodeServerFinder* EncodeServerFinder::_instance = 0;
45 EncodeServerFinder::EncodeServerFinder ()
51 Config::instance()->Changed.connect (boost::bind (&EncodeServerFinder::config_changed, this, _1));
55 EncodeServerFinder::start ()
57 _search_thread = new boost::thread (boost::bind (&EncodeServerFinder::search_thread, this));
58 _listen_thread = new boost::thread (boost::bind (&EncodeServerFinder::listen_thread, this));
61 EncodeServerFinder::~EncodeServerFinder ()
65 _search_condition.notify_all ();
67 /* Ideally this would be a DCPOMATIC_ASSERT(_search_thread->joinable()) but we
68 can't throw exceptions from a destructor.
70 if (_search_thread->joinable ()) {
71 _search_thread->join ();
75 _listen_io_service.stop ();
77 /* Ideally this would be a DCPOMATIC_ASSERT(_listen_thread->joinable()) but we
78 can't throw exceptions from a destructor.
80 if (_listen_thread->joinable ()) {
81 _listen_thread->join ();
87 EncodeServerFinder::search_thread ()
90 boost::system::error_code error;
91 boost::asio::io_service io_service;
92 boost::asio::ip::udp::socket socket (io_service);
93 socket.open (boost::asio::ip::udp::v4(), error);
95 throw NetworkError ("failed to set up broadcast socket");
98 socket.set_option (boost::asio::ip::udp::socket::reuse_address (true));
99 socket.set_option (boost::asio::socket_base::broadcast (true));
101 string const data = DCPOMATIC_HELLO;
104 if (Config::instance()->use_any_servers ()) {
105 /* Broadcast to look for servers */
107 boost::asio::ip::udp::endpoint end_point (boost::asio::ip::address_v4::broadcast(), Config::instance()->server_port_base() + 1);
108 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
114 /* Query our `definite' servers (if there are any) */
115 vector<string> servers = Config::instance()->servers ();
116 for (vector<string>::const_iterator i = servers.begin(); i != servers.end(); ++i) {
117 if (server_found (*i)) {
118 /* Don't bother asking a server that we already know about */
122 boost::asio::ip::udp::resolver resolver (io_service);
123 boost::asio::ip::udp::resolver::query query (*i, raw_convert<string> (Config::instance()->server_port_base() + 1));
124 boost::asio::ip::udp::endpoint end_point (*resolver.resolve (query));
125 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
131 boost::mutex::scoped_lock lm (_search_condition_mutex);
132 _search_condition.timed_wait (lm, boost::get_system_time() + boost::posix_time::seconds (10));
141 EncodeServerFinder::listen_thread ()
143 using namespace boost::asio::ip;
146 _listen_acceptor.reset (new tcp::acceptor (_listen_io_service, tcp::endpoint (tcp::v4(), Config::instance()->server_port_base() + 1)));
148 boost::throw_exception (NetworkError (_("Could not listen for remote encode servers. Perhaps another instance of DCP-o-matic is running.")));
152 _listen_io_service.run ();
160 EncodeServerFinder::start_accept ()
162 shared_ptr<Socket> socket (new Socket ());
163 _listen_acceptor->async_accept (
165 boost::bind (&EncodeServerFinder::handle_accept, this, boost::asio::placeholders::error, socket)
170 EncodeServerFinder::handle_accept (boost::system::error_code ec, shared_ptr<Socket> socket)
178 socket->read (reinterpret_cast<uint8_t*> (&length), sizeof (uint32_t));
179 length = ntohl (length);
181 scoped_array<char> buffer (new char[length]);
182 socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
184 string s (buffer.get());
185 shared_ptr<cxml::Document> xml (new cxml::Document ("ServerAvailable"));
186 xml->read_string (s);
188 string const ip = socket->socket().remote_endpoint().address().to_string ();
189 if (!server_found (ip) && xml->optional_number_child<int>("Version").get_value_or (0) == SERVER_LINK_VERSION) {
190 EncodeServerDescription sd (ip, xml->number_child<int> ("Threads"));
192 boost::mutex::scoped_lock lm (_servers_mutex);
193 _servers.push_back (sd);
195 emit (boost::bind (boost::ref (ServersListChanged)));
202 EncodeServerFinder::server_found (string ip) const
204 boost::mutex::scoped_lock lm (_servers_mutex);
205 list<EncodeServerDescription>::const_iterator i = _servers.begin();
206 while (i != _servers.end() && i->host_name() != ip) {
210 return i != _servers.end ();
214 EncodeServerFinder::instance ()
217 _instance = new EncodeServerFinder ();
225 EncodeServerFinder::drop ()
231 list<EncodeServerDescription>
232 EncodeServerFinder::servers () const
234 boost::mutex::scoped_lock lm (_servers_mutex);
239 EncodeServerFinder::config_changed (Config::Property what)
241 if (what == Config::USE_ANY_SERVERS || what == Config::SERVERS) {
243 boost::mutex::scoped_lock lm (_servers_mutex);
246 ServersListChanged ();
247 _search_condition.notify_all ();