src/lib/server.cc

   1 /*
   2     Copyright (C) 2012-2015 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 "compose.hpp"
  36 #include <libcxml/cxml.h>
  37 #include <boost/algorithm/string.hpp>
  38 #include <boost/scoped_array.hpp>
  39 #include <string>
  40 #include <vector>
  41 #include <iostream>
  42
  43 #include "i18n.h"
  44
  45 #define LOG_GENERAL(...)    _log->log (String::compose (__VA_ARGS__), Log::TYPE_GENERAL);
  46 #define LOG_GENERAL_NC(...) _log->log (__VA_ARGS__, Log::TYPE_GENERAL);
  47 #define LOG_ERROR(...)      _log->log (String::compose (__VA_ARGS__), Log::TYPE_ERROR);
  48 #define LOG_ERROR_NC(...)   _log->log (__VA_ARGS__, Log::TYPE_ERROR);
  49
  50 using std::string;
  51 using std::vector;
  52 using std::list;
  53 using std::cout;
  54 using std::cerr;
  55 using std::fixed;
  56 using boost::shared_ptr;
  57 using boost::thread;
  58 using boost::bind;
  59 using boost::scoped_array;
  60 using boost::optional;
  61 using dcp::Size;
  62
  63 Server::Server (shared_ptr<Log> log, bool verbose)
  64         : _terminate (false)
  65         , _log (log)
  66         , _verbose (verbose)
  67         , _acceptor (_io_service, boost::asio::ip::tcp::endpoint (boost::asio::ip::tcp::v4(), Config::instance()->server_port_base()))
  68 {
  69
  70 }
  71
  72 Server::~Server ()
  73 {
  74         {
  75                 boost::mutex::scoped_lock lm (_worker_mutex);
  76                 _terminate = true;
  77                 _empty_condition.notify_all ();
  78         }
  79
  80         for (vector<boost::thread*>::iterator i = _worker_threads.begin(); i != _worker_threads.end(); ++i) {
  81                 (*i)->join ();
  82                 delete *i;
  83         }
  84
  85         _io_service.stop ();
  86
  87         _broadcast.io_service.stop ();
  88         _broadcast.thread->join ();
  89 }
  90
  91 /** @param after_read Filled in with gettimeofday() after reading the input from the network.
  92  *  @param after_encode Filled in with gettimeofday() after encoding the image.
  93  */
  94 int
  95 Server::process (shared_ptr<Socket> socket, struct timeval& after_read, struct timeval& after_encode)
  96 {
  97         uint32_t length = socket->read_uint32 ();
  98         scoped_array<char> buffer (new char[length]);
  99         socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
 100
 101         string s (buffer.get());
 102         shared_ptr<cxml::Document> xml (new cxml::Document ("EncodingRequest"));
 103         xml->read_string (s);
 104         /* This is a double-check; the server shouldn't even be on the candidate list
 105            if it is the wrong version, but it doesn't hurt to make sure here.
 106         */
 107         if (xml->number_child<int> ("Version") != SERVER_LINK_VERSION) {
 108                 cerr << "Mismatched server/client versions\n";
 109                 LOG_ERROR_NC ("Mismatched server/client versions");
 110                 return -1;
 111         }
 112
 113         shared_ptr<PlayerVideo> pvf (new PlayerVideo (xml, socket));
 114
 115         DCPVideo dcp_video_frame (pvf, xml, _log);
 116
 117         gettimeofday (&after_read, 0);
 118
 119         Data encoded = dcp_video_frame.encode_locally (boost::bind (&Log::dcp_log, _log.get(), _1, _2));
 120
 121         gettimeofday (&after_encode, 0);
 122
 123         try {
 124                 socket->write (encoded.size ());
 125                 socket->write (encoded.data ().get (), encoded.size ());
 126         } catch (std::exception& e) {
 127                 cerr << "Send failed; frame " << dcp_video_frame.index() << "\n";
 128                 LOG_ERROR ("Send failed; frame %1", dcp_video_frame.index());
 129                 throw;
 130         }
 131
 132         return dcp_video_frame.index ();
 133 }
 134
 135 void
 136 Server::worker_thread ()
 137 {
 138         while (true) {
 139                 boost::mutex::scoped_lock lock (_worker_mutex);
 140                 while (_queue.empty () && !_terminate) {
 141                         _empty_condition.wait (lock);
 142                 }
 143
 144                 if (_terminate) {
 145                         return;
 146                 }
 147
 148                 shared_ptr<Socket> socket = _queue.front ();
 149                 _queue.pop_front ();
 150
 151                 lock.unlock ();
 152
 153                 int frame = -1;
 154                 string ip;
 155
 156                 struct timeval start;
 157                 struct timeval after_read;
 158                 struct timeval after_encode;
 159                 struct timeval end;
 160
 161                 gettimeofday (&start, 0);
 162
 163                 try {
 164                         frame = process (socket, after_read, after_encode);
 165                         ip = socket->socket().remote_endpoint().address().to_string();
 166                 } catch (std::exception& e) {
 167                         cerr << "Error: " << e.what() << "\n";
 168                         LOG_ERROR ("Error: %1", e.what());
 169                 }
 170
 171                 gettimeofday (&end, 0);
 172
 173                 socket.reset ();
 174
 175                 lock.lock ();
 176
 177                 if (frame >= 0) {
 178                         struct timeval end;
 179                         gettimeofday (&end, 0);
 180
 181                         SafeStringStream message;
 182                         message.precision (2);
 183                         message << fixed
 184                                 << "Encoded frame " << frame << " from " << ip << ": "
 185                                 << "receive " << (seconds(after_read) - seconds(start)) << "s "
 186                                 << "encode " << (seconds(after_encode) - seconds(after_read)) << "s "
 187                                 << "send " << (seconds(end) - seconds(after_encode)) << "s.";
 188
 189                         if (_verbose) {
 190                                 cout << message.str() << "\n";
 191                         }
 192
 193                         LOG_GENERAL_NC (message.str ());
 194                 }
 195
 196                 _full_condition.notify_all ();
 197         }
 198 }
 199
 200 void
 201 Server::run (int num_threads)
 202 {
 203         LOG_GENERAL ("Server starting with %1 threads", num_threads);
 204         if (_verbose) {
 205                 cout << "DCP-o-matic server starting with " << num_threads << " threads.\n";
 206         }
 207
 208         for (int i = 0; i < num_threads; ++i) {
 209                 _worker_threads.push_back (new thread (bind (&Server::worker_thread, this)));
 210         }
 211
 212         _broadcast.thread = new thread (bind (&Server::broadcast_thread, this));
 213
 214         start_accept ();
 215         _io_service.run ();
 216 }
 217
 218 void
 219 Server::broadcast_thread ()
 220 try
 221 {
 222         boost::asio::ip::address address = boost::asio::ip::address_v4::any ();
 223         boost::asio::ip::udp::endpoint listen_endpoint (address, Config::instance()->server_port_base() + 1);
 224
 225         _broadcast.socket = new boost::asio::ip::udp::socket (_broadcast.io_service);
 226         _broadcast.socket->open (listen_endpoint.protocol ());
 227         _broadcast.socket->bind (listen_endpoint);
 228
 229         _broadcast.socket->async_receive_from (
 230                 boost::asio::buffer (_broadcast.buffer, sizeof (_broadcast.buffer)),
 231                 _broadcast.send_endpoint,
 232                 boost::bind (&Server::broadcast_received, this)
 233                 );
 234
 235         _broadcast.io_service.run ();
 236 }
 237 catch (...)
 238 {
 239         store_current ();
 240 }
 241
 242 void
 243 Server::broadcast_received ()
 244 {
 245         _broadcast.buffer[sizeof(_broadcast.buffer) - 1] = '\0';
 246
 247         if (strcmp (_broadcast.buffer, DCPOMATIC_HELLO) == 0) {
 248                 /* Reply to the client saying what we can do */
 249                 xmlpp::Document doc;
 250                 xmlpp::Element* root = doc.create_root_node ("ServerAvailable");
 251                 root->add_child("Threads")->add_child_text (raw_convert<string> (_worker_threads.size ()));
 252                 root->add_child("Version")->add_child_text (raw_convert<string> (SERVER_LINK_VERSION));
 253                 string xml = doc.write_to_string ("UTF-8");
 254
 255                 if (_verbose) {
 256                         cout << "Offering services to master " << _broadcast.send_endpoint.address().to_string () << "\n";
 257                 }
 258                 shared_ptr<Socket> socket (new Socket);
 259                 try {
 260                         socket->connect (boost::asio::ip::tcp::endpoint (_broadcast.send_endpoint.address(), Config::instance()->server_port_base() + 1));
 261                         socket->write (xml.length() + 1);
 262                         socket->write ((uint8_t *) xml.c_str(), xml.length() + 1);
 263                 } catch (...) {
 264
 265                 }
 266         }
 267
 268         _broadcast.socket->async_receive_from (
 269                 boost::asio::buffer (_broadcast.buffer, sizeof (_broadcast.buffer)),
 270                 _broadcast.send_endpoint, boost::bind (&Server::broadcast_received, this)
 271                 );
 272 }
 273
 274 void
 275 Server::start_accept ()
 276 {
 277         if (_terminate) {
 278                 return;
 279         }
 280
 281         shared_ptr<Socket> socket (new Socket);
 282         _acceptor.async_accept (socket->socket (), boost::bind (&Server::handle_accept, this, socket, boost::asio::placeholders::error));
 283 }
 284
 285 void
 286 Server::handle_accept (shared_ptr<Socket> socket, boost::system::error_code const & error)
 287 {
 288         if (error) {
 289                 return;
 290         }
 291
 292         boost::mutex::scoped_lock lock (_worker_mutex);
 293
 294         /* Wait until the queue has gone down a bit */
 295         while (_queue.size() >= _worker_threads.size() * 2 && !_terminate) {
 296                 _full_condition.wait (lock);
 297         }
 298
 299         _queue.push_back (socket);
 300         _empty_condition.notify_all ();
 301
 302         start_accept ();
 303 }