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 boost::optional;
43 using dcp::raw_convert;
45 EncodeServerFinder* EncodeServerFinder::_instance = 0;
47 EncodeServerFinder::EncodeServerFinder ()
52 Config::instance()->Changed.connect (boost::bind (&EncodeServerFinder::config_changed, this, _1));
56 EncodeServerFinder::start ()
58 _search_thread = new boost::thread (boost::bind (&EncodeServerFinder::search_thread, this));
59 _listen_thread = new boost::thread (boost::bind (&EncodeServerFinder::listen_thread, this));
60 #ifdef DCPOMATIC_LINUX
61 pthread_setname_np (_search_thread->native_handle(), "encode-server-search");
62 pthread_setname_np (_listen_thread->native_handle(), "encode-server-listen");
67 EncodeServerFinder::~EncodeServerFinder ()
73 EncodeServerFinder::stop ()
77 _search_condition.notify_all ();
79 /* Ideally this would be a DCPOMATIC_ASSERT(_search_thread->joinable()) but we
80 can't throw exceptions from a destructor.
82 if (_search_thread->joinable ()) {
83 _search_thread->join ();
86 delete _search_thread;
89 _listen_io_service.stop ();
91 /* Ideally this would be a DCPOMATIC_ASSERT(_listen_thread->joinable()) but we
92 can't throw exceptions from a destructor.
94 if (_listen_thread->joinable ()) {
95 _listen_thread->join ();
98 delete _listen_thread;
101 boost::mutex::scoped_lock lm (_servers_mutex);
102 _good_servers.clear ();
103 _bad_servers.clear ();
107 remove_missing (list<EncodeServerDescription>& servers, int since)
109 bool removed = false;
110 list<EncodeServerDescription>::iterator i = servers.begin();
111 while (i != servers.end()) {
112 if (i->last_seen_seconds() > since) {
113 list<EncodeServerDescription>::iterator j = i;
126 EncodeServerFinder::search_thread ()
129 boost::system::error_code error;
130 boost::asio::io_service io_service;
131 boost::asio::ip::udp::socket socket (io_service);
132 socket.open (boost::asio::ip::udp::v4(), error);
134 throw NetworkError ("failed to set up broadcast socket");
137 socket.set_option (boost::asio::ip::udp::socket::reuse_address (true));
138 socket.set_option (boost::asio::socket_base::broadcast (true));
140 string const data = DCPOMATIC_HELLO;
141 int const interval = 10;
144 if (Config::instance()->use_any_servers ()) {
145 /* Broadcast to look for servers */
147 boost::asio::ip::udp::endpoint end_point (boost::asio::ip::address_v4::broadcast(), HELLO_PORT);
148 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
154 /* Query our `definite' servers (if there are any) */
155 vector<string> servers = Config::instance()->servers ();
156 for (vector<string>::const_iterator i = servers.begin(); i != servers.end(); ++i) {
157 if (server_found (*i)) {
158 /* Don't bother asking a server that we already know about */
162 boost::asio::ip::udp::resolver resolver (io_service);
163 boost::asio::ip::udp::resolver::query query (*i, raw_convert<string> (HELLO_PORT));
164 boost::asio::ip::udp::endpoint end_point (*resolver.resolve (query));
165 socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
171 /* Discard servers that we haven't seen for a while */
173 boost::mutex::scoped_lock lm (_servers_mutex);
174 bool g = remove_missing(_good_servers, 2 * interval);
175 bool b = remove_missing(_bad_servers, 2 * interval);
177 emit (boost::bind (boost::ref (ServersListChanged)));
181 boost::mutex::scoped_lock lm (_search_condition_mutex);
182 _search_condition.timed_wait (lm, boost::get_system_time() + boost::posix_time::seconds (interval));
191 EncodeServerFinder::listen_thread ()
193 using namespace boost::asio::ip;
196 _listen_acceptor.reset (
197 new tcp::acceptor (_listen_io_service, tcp::endpoint (tcp::v4(), is_batch_converter ? BATCH_SERVER_PRESENCE_PORT : MAIN_SERVER_PRESENCE_PORT))
200 boost::throw_exception (NetworkError (_("Could not listen for remote encode servers. Perhaps another instance of DCP-o-matic is running.")));
204 _listen_io_service.run ();
212 EncodeServerFinder::start_accept ()
214 shared_ptr<Socket> socket (new Socket ());
215 _listen_acceptor->async_accept (
217 boost::bind (&EncodeServerFinder::handle_accept, this, boost::asio::placeholders::error, socket)
222 EncodeServerFinder::handle_accept (boost::system::error_code ec, shared_ptr<Socket> socket)
230 socket->read (reinterpret_cast<uint8_t*> (&length), sizeof (uint32_t));
231 length = ntohl (length);
233 scoped_array<char> buffer (new char[length]);
234 socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
236 string s (buffer.get());
237 shared_ptr<cxml::Document> xml (new cxml::Document ("ServerAvailable"));
238 xml->read_string (s);
240 string const ip = socket->socket().remote_endpoint().address().to_string ();
241 optional<list<EncodeServerDescription>::iterator> found = server_found (ip);
243 (*found)->set_seen ();
245 EncodeServerDescription sd (ip, xml->number_child<int>("Threads"), xml->optional_number_child<int>("Version").get_value_or(0));
246 if (sd.link_version() == SERVER_LINK_VERSION) {
247 boost::mutex::scoped_lock lm (_servers_mutex);
248 _good_servers.push_back (sd);
250 boost::mutex::scoped_lock lm (_servers_mutex);
251 _bad_servers.push_back (sd);
253 emit (boost::bind (boost::ref (ServersListChanged)));
259 optional<list<EncodeServerDescription>::iterator>
260 EncodeServerFinder::server_found (string ip)
262 boost::mutex::scoped_lock lm (_servers_mutex);
263 list<EncodeServerDescription>::iterator i = _good_servers.begin();
264 while (i != _good_servers.end() && i->host_name() != ip) {
268 if (i != _good_servers.end()) {
272 i = _bad_servers.begin();
273 while (i != _bad_servers.end() && i->host_name() != ip) {
277 if (i != _bad_servers.end()) {
281 return optional<list<EncodeServerDescription>::iterator>();
285 EncodeServerFinder::instance ()
288 _instance = new EncodeServerFinder ();
296 EncodeServerFinder::drop ()
302 list<EncodeServerDescription>
303 EncodeServerFinder::good_servers () const
305 boost::mutex::scoped_lock lm (_servers_mutex);
306 return _good_servers;
309 list<EncodeServerDescription>
310 EncodeServerFinder::bad_servers () const
312 boost::mutex::scoped_lock lm (_servers_mutex);
317 EncodeServerFinder::config_changed (Config::Property what)
319 if (what == Config::USE_ANY_SERVERS || what == Config::SERVERS) {
321 boost::mutex::scoped_lock lm (_servers_mutex);
322 _good_servers.clear ();
323 _bad_servers.clear ();
325 ServersListChanged ();
326 _search_condition.notify_all ();