2 Copyright (C) 2013-2018 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 <dcp/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;
42 using dcp::raw_convert;
44 EncodeServerFinder* EncodeServerFinder::_instance = 0;
46 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));
59 #ifdef DCPOMATIC_LINUX
60 pthread_setname_np (_search_thread->native_handle(), "encode-server-search");
61 pthread_setname_np (_listen_thread->native_handle(), "encode-server-listen");
66 EncodeServerFinder::~EncodeServerFinder ()
72 EncodeServerFinder::stop ()
76 _search_condition.notify_all ();
78 /* Ideally this would be a DCPOMATIC_ASSERT(_search_thread->joinable()) but we
79 can't throw exceptions from a destructor.
81 if (_search_thread->joinable ()) {
82 _search_thread->join ();
85 delete _search_thread;
88 _listen_io_service.stop ();
90 /* Ideally this would be a DCPOMATIC_ASSERT(_listen_thread->joinable()) but we
91 can't throw exceptions from a destructor.
93 if (_listen_thread->joinable ()) {
94 _listen_thread->join ();
97 delete _listen_thread;
100 boost::mutex::scoped_lock lm (_servers_mutex);
101 _good_servers.clear ();
102 _bad_servers.clear ();
106 EncodeServerFinder::search_thread ()
109 boost::system::error_code error;
110 boost::asio::io_service io_service;
111 boost::asio::ip::udp::socket socket (io_service);
112 socket.open (boost::asio::ip::udp::v4(), error);
114 throw NetworkError ("failed to set up broadcast socket");
117 socket.set_option (boost::asio::ip::udp::socket::reuse_address (true));
118 socket.set_option (boost::asio::socket_base::broadcast (true));
120 string const data = DCPOMATIC_HELLO;
123 if (Config::instance()->use_any_servers ()) {
124 /* Broadcast to look for servers */
126 boost::asio::ip::udp::endpoint end_point (boost::asio::ip::address_v4::broadcast(), HELLO_PORT);
127 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
133 /* Query our `definite' servers (if there are any) */
134 vector<string> servers = Config::instance()->servers ();
135 for (vector<string>::const_iterator i = servers.begin(); i != servers.end(); ++i) {
136 if (server_found (*i)) {
137 /* Don't bother asking a server that we already know about */
141 boost::asio::ip::udp::resolver resolver (io_service);
142 boost::asio::ip::udp::resolver::query query (*i, raw_convert<string> (HELLO_PORT));
143 boost::asio::ip::udp::endpoint end_point (*resolver.resolve (query));
144 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
150 boost::mutex::scoped_lock lm (_search_condition_mutex);
151 _search_condition.timed_wait (lm, boost::get_system_time() + boost::posix_time::seconds (10));
160 EncodeServerFinder::listen_thread ()
162 using namespace boost::asio::ip;
165 _listen_acceptor.reset (
166 new tcp::acceptor (_listen_io_service, tcp::endpoint (tcp::v4(), is_batch_converter ? BATCH_SERVER_PRESENCE_PORT : MAIN_SERVER_PRESENCE_PORT))
169 boost::throw_exception (NetworkError (_("Could not listen for remote encode servers. Perhaps another instance of DCP-o-matic is running.")));
173 _listen_io_service.run ();
181 EncodeServerFinder::start_accept ()
183 shared_ptr<Socket> socket (new Socket ());
184 _listen_acceptor->async_accept (
186 boost::bind (&EncodeServerFinder::handle_accept, this, boost::asio::placeholders::error, socket)
191 EncodeServerFinder::handle_accept (boost::system::error_code ec, shared_ptr<Socket> socket)
199 socket->read (reinterpret_cast<uint8_t*> (&length), sizeof (uint32_t));
200 length = ntohl (length);
202 scoped_array<char> buffer (new char[length]);
203 socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
205 string s (buffer.get());
206 shared_ptr<cxml::Document> xml (new cxml::Document ("ServerAvailable"));
207 xml->read_string (s);
209 string const ip = socket->socket().remote_endpoint().address().to_string ();
210 if (!server_found (ip)) {
211 EncodeServerDescription sd (ip, xml->number_child<int>("Threads"), xml->optional_number_child<int>("Version").get_value_or(0));
212 if (sd.link_version() == SERVER_LINK_VERSION) {
213 boost::mutex::scoped_lock lm (_servers_mutex);
214 _good_servers.push_back (sd);
216 boost::mutex::scoped_lock lm (_servers_mutex);
217 _bad_servers.push_back (sd);
219 emit (boost::bind (boost::ref (ServersListChanged)));
226 EncodeServerFinder::server_found (string ip) const
228 boost::mutex::scoped_lock lm (_servers_mutex);
229 list<EncodeServerDescription>::const_iterator i = _good_servers.begin();
230 while (i != _good_servers.end() && i->host_name() != ip) {
234 if (i != _good_servers.end()) {
238 i = _bad_servers.begin();
239 while (i != _bad_servers.end() && i->host_name() != ip) {
243 return i != _bad_servers.end ();
247 EncodeServerFinder::instance ()
250 _instance = new EncodeServerFinder ();
258 EncodeServerFinder::drop ()
264 list<EncodeServerDescription>
265 EncodeServerFinder::good_servers () const
267 boost::mutex::scoped_lock lm (_servers_mutex);
268 return _good_servers;
271 list<EncodeServerDescription>
272 EncodeServerFinder::bad_servers () const
274 boost::mutex::scoped_lock lm (_servers_mutex);
279 EncodeServerFinder::config_changed (Config::Property what)
281 if (what == Config::USE_ANY_SERVERS || what == Config::SERVERS) {
283 boost::mutex::scoped_lock lm (_servers_mutex);
284 _good_servers.clear ();
285 _bad_servers.clear ();
287 ServersListChanged ();
288 _search_condition.notify_all ();