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