src/lib/server.cc

   1 /*
   2     Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 /** @file src/server.cc
  21  *  @brief Class to describe a server to which we can send
  22  *  encoding work, and a class to implement such a server.
  23  */
  24
  25 #include "server.h"
  26 #include "dcpomatic_socket.h"
  27 #include "image.h"
  28 #include "dcp_video.h"
  29 #include "config.h"
  30 #include "cross.h"
  31 #include "player_video.h"
  32 #include "data.h"
  33 #include "safe_stringstream.h"
  34 #include "raw_convert.h"
  35 #include <libcxml/cxml.h>
  36 #include <boost/algorithm/string.hpp>
  37 #include <boost/scoped_array.hpp>
  38 #include <string>
  39 #include <vector>
  40 #include <iostream>
  41
  42 #include "i18n.h"
  43
  44 #define LOG_GENERAL(...)    _log->log (String::compose (__VA_ARGS__), Log::TYPE_GENERAL);
  45 #define LOG_GENERAL_NC(...) _log->log (__VA_ARGS__, Log::TYPE_GENERAL);
  46 #define LOG_ERROR(...)      _log->log (String::compose (__VA_ARGS__), Log::TYPE_ERROR);
  47 #define LOG_ERROR_NC(...)   _log->log (__VA_ARGS__, Log::TYPE_ERROR);
  48
  49 using std::string;
  50 using std::multimap;
  51 using std::vector;
  52 using std::list;
  53 using std::cout;
  54 using std::cerr;
  55 using std::setprecision;
  56 using std::fixed;
  57 using boost::shared_ptr;
  58 using boost::algorithm::is_any_of;
  59 using boost::algorithm::split;
  60 using boost::thread;
  61 using boost::bind;
  62 using boost::scoped_array;
  63 using boost::optional;
  64 using dcp::Size;
  65
  66 Server::Server (shared_ptr<Log> log, bool verbose)
  67         : _terminate (false)
  68         , _log (log)
  69         , _verbose (verbose)
  70         , _acceptor (_io_service, boost::asio::ip::tcp::endpoint (boost::asio::ip::tcp::v4(), Config::instance()->server_port_base()))
  71 {
  72
  73 }
  74
  75 Server::~Server ()
  76 {
  77         {
  78                 boost::mutex::scoped_lock lm (_worker_mutex);
  79                 _terminate = true;
  80                 _empty_condition.notify_all ();
  81         }
  82
  83         for (vector<boost::thread*>::iterator i = _worker_threads.begin(); i != _worker_threads.end(); ++i) {
  84                 (*i)->join ();
  85                 delete *i;
  86         }
  87
  88         _io_service.stop ();
  89
  90         _broadcast.io_service.stop ();
  91         _broadcast.thread->join ();
  92 }
  93
  94 /** @param after_read Filled in with gettimeofday() after reading the input from the network.
  95  *  @param after_encode Filled in with gettimeofday() after encoding the image.
  96  */
  97 int
  98 Server::process (shared_ptr<Socket> socket, struct timeval& after_read, struct timeval& after_encode)
  99 {
 100         uint32_t length = socket->read_uint32 ();
 101         scoped_array<char> buffer (new char[length]);
 102         socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
 103
 104         string s (buffer.get());
 105         shared_ptr<cxml::Document> xml (new cxml::Document ("EncodingRequest"));
 106         xml->read_string (s);
 107         /* This is a double-check; the server shouldn't even be on the candidate list
 108            if it is the wrong version, but it doesn't hurt to make sure here.
 109         */
 110         if (xml->number_child<int> ("Version") != SERVER_LINK_VERSION) {
 111                 cerr << "Mismatched server/client versions\n";
 112                 LOG_ERROR_NC ("Mismatched server/client versions");
 113                 return -1;
 114         }
 115
 116         shared_ptr<PlayerVideo> pvf (new PlayerVideo (xml, socket));
 117
 118         DCPVideo dcp_video_frame (pvf, xml, _log);
 119
 120         gettimeofday (&after_read, 0);
 121
 122         Data encoded = dcp_video_frame.encode_locally (boost::bind (&Log::dcp_log, _log.get(), _1, _2));
 123
 124         gettimeofday (&after_encode, 0);
 125
 126         try {
 127                 socket->write (encoded.size ());
 128                 socket->write (encoded.data ().get (), encoded.size ());
 129         } catch (std::exception& e) {
 130                 cerr << "Send failed; frame " << dcp_video_frame.index() << "\n";
 131                 LOG_ERROR ("Send failed; frame %1", dcp_video_frame.index());
 132                 throw;
 133         }
 134
 135         return dcp_video_frame.index ();
 136 }
 137
 138 void
 139 Server::worker_thread ()
 140 {
 141         while (true) {
 142                 boost::mutex::scoped_lock lock (_worker_mutex);
 143                 while (_queue.empty () && !_terminate) {
 144                         _empty_condition.wait (lock);
 145                 }
 146
 147                 if (_terminate) {
 148                         return;
 149                 }
 150
 151                 shared_ptr<Socket> socket = _queue.front ();
 152                 _queue.pop_front ();
 153
 154                 lock.unlock ();
 155
 156                 int frame = -1;
 157                 string ip;
 158
 159                 struct timeval start;
 160                 struct timeval after_read;
 161                 struct timeval after_encode;
 162                 struct timeval end;
 163
 164                 gettimeofday (&start, 0);
 165
 166                 try {
 167                         frame = process (socket, after_read, after_encode);
 168                         ip = socket->socket().remote_endpoint().address().to_string();
 169                 } catch (std::exception& e) {
 170                         cerr << "Error: " << e.what() << "\n";
 171                         LOG_ERROR ("Error: %1", e.what());
 172                 }
 173
 174                 gettimeofday (&end, 0);
 175
 176                 socket.reset ();
 177
 178                 lock.lock ();
 179
 180                 if (frame >= 0) {
 181                         struct timeval end;
 182                         gettimeofday (&end, 0);
 183
 184                         SafeStringStream message;
 185                         message.precision (2);
 186                         message << fixed
 187                                 << "Encoded frame " << frame << " from " << ip << ": "
 188                                 << "receive " << (seconds(after_read) - seconds(start)) << "s "
 189                                 << "encode " << (seconds(after_encode) - seconds(after_read)) << "s "
 190                                 << "send " << (seconds(end) - seconds(after_encode)) << "s.";
 191
 192                         if (_verbose) {
 193                                 cout << message.str() << "\n";
 194                         }
 195
 196                         LOG_GENERAL_NC (message.str ());
 197                 }
 198
 199                 _full_condition.notify_all ();
 200         }
 201 }
 202
 203 void
 204 Server::run (int num_threads)
 205 {
 206         LOG_GENERAL ("Server starting with %1 threads", num_threads);
 207         if (_verbose) {
 208                 cout << "DCP-o-matic server starting with " << num_threads << " threads.\n";
 209         }
 210
 211         for (int i = 0; i < num_threads; ++i) {
 212                 _worker_threads.push_back (new thread (bind (&Server::worker_thread, this)));
 213         }
 214
 215         _broadcast.thread = new thread (bind (&Server::broadcast_thread, this));
 216
 217         start_accept ();
 218         _io_service.run ();
 219 }
 220
 221 void
 222 Server::broadcast_thread ()
 223 try
 224 {
 225         boost::asio::ip::address address = boost::asio::ip::address_v4::any ();
 226         boost::asio::ip::udp::endpoint listen_endpoint (address, Config::instance()->server_port_base() + 1);
 227
 228         _broadcast.socket = new boost::asio::ip::udp::socket (_broadcast.io_service);
 229         _broadcast.socket->open (listen_endpoint.protocol ());
 230         _broadcast.socket->bind (listen_endpoint);
 231
 232         _broadcast.socket->async_receive_from (
 233                 boost::asio::buffer (_broadcast.buffer, sizeof (_broadcast.buffer)),
 234                 _broadcast.send_endpoint,
 235                 boost::bind (&Server::broadcast_received, this)
 236                 );
 237
 238         _broadcast.io_service.run ();
 239 }
 240 catch (...)
 241 {
 242         store_current ();
 243 }
 244
 245 void
 246 Server::broadcast_received ()
 247 {
 248         _broadcast.buffer[sizeof(_broadcast.buffer) - 1] = '\0';
 249
 250         if (strcmp (_broadcast.buffer, DCPOMATIC_HELLO) == 0) {
 251                 /* Reply to the client saying what we can do */
 252                 xmlpp::Document doc;
 253                 xmlpp::Element* root = doc.create_root_node ("ServerAvailable");
 254                 root->add_child("Threads")->add_child_text (raw_convert<string> (_worker_threads.size ()));
 255                 root->add_child("Version")->add_child_text (raw_convert<string> (SERVER_LINK_VERSION));
 256                 string xml = doc.write_to_string ("UTF-8");
 257
 258                 if (_verbose) {
 259                         cout << "Offering services to master " << _broadcast.send_endpoint.address().to_string () << "\n";
 260                 }
 261                 shared_ptr<Socket> socket (new Socket);
 262                 try {
 263                         socket->connect (boost::asio::ip::tcp::endpoint (_broadcast.send_endpoint.address(), Config::instance()->server_port_base() + 1));
 264                         socket->write (xml.length() + 1);
 265                         socket->write ((uint8_t *) xml.c_str(), xml.length() + 1);
 266                 } catch (...) {
 267
 268                 }
 269         }
 270
 271         _broadcast.socket->async_receive_from (
 272                 boost::asio::buffer (_broadcast.buffer, sizeof (_broadcast.buffer)),
 273                 _broadcast.send_endpoint, boost::bind (&Server::broadcast_received, this)
 274                 );
 275 }
 276
 277 void
 278 Server::start_accept ()
 279 {
 280         if (_terminate) {
 281                 return;
 282         }
 283
 284         shared_ptr<Socket> socket (new Socket);
 285         _acceptor.async_accept (socket->socket (), boost::bind (&Server::handle_accept, this, socket, boost::asio::placeholders::error));
 286 }
 287
 288 void
 289 Server::handle_accept (shared_ptr<Socket> socket, boost::system::error_code const & error)
 290 {
 291         if (error) {
 292                 return;
 293         }
 294
 295         boost::mutex::scoped_lock lock (_worker_mutex);
 296
 297         /* Wait until the queue has gone down a bit */
 298         while (_queue.size() >= _worker_threads.size() * 2 && !_terminate) {
 299                 _full_condition.wait (lock);
 300         }
 301
 302         _queue.push_back (socket);
 303         _empty_condition.notify_all ();
 304
 305         start_accept ();
 306 }
 307