--- /dev/null
+/*
+ Copyright (C) 2013-2015 Carl Hetherington <cth@carlh.net>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "encode_server_finder.h"
+#include "exceptions.h"
+#include "util.h"
+#include "config.h"
+#include "cross.h"
+#include "encode_server_description.h"
+#include "dcpomatic_socket.h"
+#include "raw_convert.h"
+#include <libcxml/cxml.h>
+#include <boost/lambda/lambda.hpp>
+#include <iostream>
+
+#include "i18n.h"
+
+using std::string;
+using std::list;
+using std::vector;
+using std::cout;
+using boost::shared_ptr;
+using boost::scoped_array;
+using boost::weak_ptr;
+
+EncodeServerFinder* EncodeServerFinder::_instance = 0;
+
+EncodeServerFinder::EncodeServerFinder ()
+ : _disabled (false)
+ , _search_thread (0)
+ , _listen_thread (0)
+ , _stop (false)
+{
+ Config::instance()->Changed.connect (boost::bind (&EncodeServerFinder::config_changed, this, _1));
+}
+
+void
+EncodeServerFinder::start ()
+{
+ _search_thread = new boost::thread (boost::bind (&EncodeServerFinder::search_thread, this));
+ _listen_thread = new boost::thread (boost::bind (&EncodeServerFinder::listen_thread, this));
+}
+
+EncodeServerFinder::~EncodeServerFinder ()
+{
+ _stop = true;
+
+ _search_condition.notify_all ();
+ if (_search_thread) {
+ DCPOMATIC_ASSERT (_search_thread->joinable ());
+ _search_thread->join ();
+ }
+
+ _listen_io_service.stop ();
+ if (_listen_thread) {
+ DCPOMATIC_ASSERT (_listen_thread->joinable ());
+ _listen_thread->join ();
+ }
+}
+
+void
+EncodeServerFinder::search_thread ()
+try
+{
+ boost::system::error_code error;
+ boost::asio::io_service io_service;
+ boost::asio::ip::udp::socket socket (io_service);
+ socket.open (boost::asio::ip::udp::v4(), error);
+ if (error) {
+ throw NetworkError ("failed to set up broadcast socket");
+ }
+
+ socket.set_option (boost::asio::ip::udp::socket::reuse_address (true));
+ socket.set_option (boost::asio::socket_base::broadcast (true));
+
+ string const data = DCPOMATIC_HELLO;
+
+ while (!_stop) {
+ if (Config::instance()->use_any_servers ()) {
+ /* Broadcast to look for servers */
+ try {
+ boost::asio::ip::udp::endpoint end_point (boost::asio::ip::address_v4::broadcast(), Config::instance()->server_port_base() + 1);
+ socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
+ } catch (...) {
+
+ }
+ }
+
+ /* Query our `definite' servers (if there are any) */
+ vector<string> servers = Config::instance()->servers ();
+ for (vector<string>::const_iterator i = servers.begin(); i != servers.end(); ++i) {
+ if (server_found (*i)) {
+ /* Don't bother asking a server that we already know about */
+ continue;
+ }
+ try {
+ boost::asio::ip::udp::resolver resolver (io_service);
+ boost::asio::ip::udp::resolver::query query (*i, raw_convert<string> (Config::instance()->server_port_base() + 1));
+ boost::asio::ip::udp::endpoint end_point (*resolver.resolve (query));
+ socket.send_to (boost::asio::buffer (data.c_str(), data.size() + 1), end_point);
+ } catch (...) {
+
+ }
+ }
+
+ boost::mutex::scoped_lock lm (_search_condition_mutex);
+ _search_condition.timed_wait (lm, boost::get_system_time() + boost::posix_time::seconds (10));
+ }
+}
+catch (...)
+{
+ store_current ();
+}
+
+void
+EncodeServerFinder::listen_thread ()
+try {
+ using namespace boost::asio::ip;
+
+ try {
+ _listen_acceptor.reset (new tcp::acceptor (_listen_io_service, tcp::endpoint (tcp::v4(), Config::instance()->server_port_base() + 1)));
+ } catch (...) {
+ boost::throw_exception (NetworkError (_("Could not listen for remote encode servers. Perhaps another instance of DCP-o-matic is running.")));
+ }
+
+ start_accept ();
+ _listen_io_service.run ();
+}
+catch (...)
+{
+ store_current ();
+}
+
+void
+EncodeServerFinder::start_accept ()
+{
+ shared_ptr<Socket> socket (new Socket ());
+ _listen_acceptor->async_accept (
+ socket->socket(),
+ boost::bind (&EncodeServerFinder::handle_accept, this, boost::asio::placeholders::error, socket)
+ );
+}
+
+void
+EncodeServerFinder::handle_accept (boost::system::error_code ec, shared_ptr<Socket> socket)
+{
+ if (ec) {
+ start_accept ();
+ return;
+ }
+
+ uint32_t length;
+ socket->read (reinterpret_cast<uint8_t*> (&length), sizeof (uint32_t));
+ length = ntohl (length);
+
+ scoped_array<char> buffer (new char[length]);
+ socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
+
+ string s (buffer.get());
+ shared_ptr<cxml::Document> xml (new cxml::Document ("ServerAvailable"));
+ xml->read_string (s);
+
+ string const ip = socket->socket().remote_endpoint().address().to_string ();
+ if (!server_found (ip) && xml->optional_number_child<int>("Version").get_value_or (0) == SERVER_LINK_VERSION) {
+ EncodeServerDescription sd (ip, xml->number_child<int> ("Threads"));
+ {
+ boost::mutex::scoped_lock lm (_servers_mutex);
+ _servers.push_back (sd);
+ }
+ emit (boost::bind (boost::ref (ServersListChanged)));
+ }
+
+ start_accept ();
+}
+
+bool
+EncodeServerFinder::server_found (string ip) const
+{
+ boost::mutex::scoped_lock lm (_servers_mutex);
+ list<EncodeServerDescription>::const_iterator i = _servers.begin();
+ while (i != _servers.end() && i->host_name() != ip) {
+ ++i;
+ }
+
+ return i != _servers.end ();
+}
+
+EncodeServerFinder*
+EncodeServerFinder::instance ()
+{
+ if (!_instance) {
+ _instance = new EncodeServerFinder ();
+ _instance->start ();
+ }
+
+ return _instance;
+}
+
+void
+EncodeServerFinder::drop ()
+{
+ delete _instance;
+ _instance = 0;
+}
+
+list<EncodeServerDescription>
+EncodeServerFinder::servers () const
+{
+ boost::mutex::scoped_lock lm (_servers_mutex);
+ return _servers;
+}
+
+void
+EncodeServerFinder::config_changed (Config::Property what)
+{
+ if (what == Config::USE_ANY_SERVERS || what == Config::SERVERS) {
+ {
+ boost::mutex::scoped_lock lm (_servers_mutex);
+ _servers.clear ();
+ }
+ ServersListChanged ();
+ _search_condition.notify_all ();
+ }
+}
projects / dcpomatic.git / blobdiff