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 ()
50 Config::instance()->Changed.connect (boost::bind (&EncodeServerFinder::config_changed, this, _1));
54 EncodeServerFinder::start ()
56 _search_thread = new boost::thread (boost::bind (&EncodeServerFinder::search_thread, this));
57 _listen_thread = new boost::thread (boost::bind (&EncodeServerFinder::listen_thread, this));
61 EncodeServerFinder::~EncodeServerFinder ()
67 EncodeServerFinder::stop ()
71 _search_condition.notify_all ();
73 /* Ideally this would be a DCPOMATIC_ASSERT(_search_thread->joinable()) but we
74 can't throw exceptions from a destructor.
76 if (_search_thread->joinable ()) {
77 _search_thread->join ();
80 delete _search_thread;
83 _listen_io_service.stop ();
85 /* Ideally this would be a DCPOMATIC_ASSERT(_listen_thread->joinable()) but we
86 can't throw exceptions from a destructor.
88 if (_listen_thread->joinable ()) {
89 _listen_thread->join ();
92 delete _listen_thread;
95 boost::mutex::scoped_lock lm (_servers_mutex);
100 EncodeServerFinder::search_thread ()
103 boost::system::error_code error;
104 boost::asio::io_service io_service;
105 boost::asio::ip::udp::socket socket (io_service);
106 socket.open (boost::asio::ip::udp::v4(), error);
108 throw NetworkError ("failed to set up broadcast socket");
111 socket.set_option (boost::asio::ip::udp::socket::reuse_address (true));
112 socket.set_option (boost::asio::socket_base::broadcast (true));
114 string const data = DCPOMATIC_HELLO;
117 if (Config::instance()->use_any_servers ()) {
118 /* Broadcast to look for servers */
120 boost::asio::ip::udp::endpoint end_point (boost::asio::ip::address_v4::broadcast(), Config::instance()->server_port_base() + 1);
121 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
127 /* Query our `definite' servers (if there are any) */
128 vector<string> servers = Config::instance()->servers ();
129 for (vector<string>::const_iterator i = servers.begin(); i != servers.end(); ++i) {
130 if (server_found (*i)) {
131 /* Don't bother asking a server that we already know about */
135 boost::asio::ip::udp::resolver resolver (io_service);
136 boost::asio::ip::udp::resolver::query query (*i, raw_convert<string> (Config::instance()->server_port_base() + 1));
137 boost::asio::ip::udp::endpoint end_point (*resolver.resolve (query));
138 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
144 boost::mutex::scoped_lock lm (_search_condition_mutex);
145 _search_condition.timed_wait (lm, boost::get_system_time() + boost::posix_time::seconds (10));
154 EncodeServerFinder::listen_thread ()
156 using namespace boost::asio::ip;
159 _listen_acceptor.reset (new tcp::acceptor (_listen_io_service, tcp::endpoint (tcp::v4(), Config::instance()->server_port_base() + 1)));
161 boost::throw_exception (NetworkError (_("Could not listen for remote encode servers. Perhaps another instance of DCP-o-matic is running.")));
165 _listen_io_service.run ();
173 EncodeServerFinder::start_accept ()
175 shared_ptr<Socket> socket (new Socket ());
176 _listen_acceptor->async_accept (
178 boost::bind (&EncodeServerFinder::handle_accept, this, boost::asio::placeholders::error, socket)
183 EncodeServerFinder::handle_accept (boost::system::error_code ec, shared_ptr<Socket> socket)
191 socket->read (reinterpret_cast<uint8_t*> (&length), sizeof (uint32_t));
192 length = ntohl (length);
194 scoped_array<char> buffer (new char[length]);
195 socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
197 string s (buffer.get());
198 shared_ptr<cxml::Document> xml (new cxml::Document ("ServerAvailable"));
199 xml->read_string (s);
201 string const ip = socket->socket().remote_endpoint().address().to_string ();
202 if (!server_found (ip) && xml->optional_number_child<int>("Version").get_value_or (0) == SERVER_LINK_VERSION) {
203 EncodeServerDescription sd (ip, xml->number_child<int> ("Threads"));
205 boost::mutex::scoped_lock lm (_servers_mutex);
206 _servers.push_back (sd);
208 emit (boost::bind (boost::ref (ServersListChanged)));
215 EncodeServerFinder::server_found (string ip) const
217 boost::mutex::scoped_lock lm (_servers_mutex);
218 list<EncodeServerDescription>::const_iterator i = _servers.begin();
219 while (i != _servers.end() && i->host_name() != ip) {
223 return i != _servers.end ();
227 EncodeServerFinder::instance ()
230 _instance = new EncodeServerFinder ();
238 EncodeServerFinder::drop ()
244 list<EncodeServerDescription>
245 EncodeServerFinder::servers () const
247 boost::mutex::scoped_lock lm (_servers_mutex);
252 EncodeServerFinder::config_changed (Config::Property what)
254 if (what == Config::USE_ANY_SERVERS || what == Config::SERVERS) {
256 boost::mutex::scoped_lock lm (_servers_mutex);
259 ServersListChanged ();
260 _search_condition.notify_all ();