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 <string>
  26 #include <vector>
  27 #include <sstream>
  28 #include <iostream>
  29 #include <boost/algorithm/string.hpp>
  30 #include <boost/scoped_array.hpp>
  31 #include <libcxml/cxml.h>
  32 #include <dcp/raw_convert.h>
  33 #include "server.h"
  34 #include "util.h"
  35 #include "scaler.h"
  36 #include "image.h"
  37 #include "dcp_video.h"
  38 #include "config.h"
  39 #include "cross.h"
  40 #include "player_video.h"
  41 #include "encoded_data.h"
  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::stringstream;
  52 using std::multimap;
  53 using std::vector;
  54 using std::list;
  55 using std::cout;
  56 using std::cerr;
  57 using std::setprecision;
  58 using std::fixed;
  59 using boost::shared_ptr;
  60 using boost::algorithm::is_any_of;
  61 using boost::algorithm::split;
  62 using boost::thread;
  63 using boost::bind;
  64 using boost::scoped_array;
  65 using boost::optional;
  66 using dcp::Size;
  67 using dcp::raw_convert;
  68
  69 Server::Server (shared_ptr<Log> log, bool verbose)
  70         : _terminate (false)
  71         , _log (log)
  72         , _verbose (verbose)
  73         , _acceptor (_io_service, boost::asio::ip::tcp::endpoint (boost::asio::ip::tcp::v4(), Config::instance()->server_port_base()))
  74 {
  75
  76 }
  77
  78 Server::~Server ()
  79 {
  80         {
  81                 boost::mutex::scoped_lock lm (_worker_mutex);
  82                 _terminate = true;
  83                 _empty_condition.notify_all ();
  84         }
  85
  86         for (vector<boost::thread*>::iterator i = _worker_threads.begin(); i != _worker_threads.end(); ++i) {
  87                 (*i)->join ();
  88                 delete *i;
  89         }
  90
  91         _io_service.stop ();
  92
  93         _broadcast.io_service.stop ();
  94         _broadcast.thread->join ();
  95 }
  96
  97 /** @param after_read Filled in with gettimeofday() after reading the input from the network.
  98  *  @param after_encode Filled in with gettimeofday() after encoding the image.
  99  */
 100 int
 101 Server::process (shared_ptr<Socket> socket, struct timeval& after_read, struct timeval& after_encode)
 102 {
 103         uint32_t length = socket->read_uint32 ();
 104         scoped_array<char> buffer (new char[length]);
 105         socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
 106
 107         stringstream s (buffer.get());
 108         shared_ptr<cxml::Document> xml (new cxml::Document ("EncodingRequest"));
 109         xml->read_stream (s);
 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, _log));
 117
 118         DCPVideo dcp_video_frame (pvf, xml, _log);
 119
 120         gettimeofday (&after_read, 0);
 121
 122         shared_ptr<EncodedData> encoded = dcp_video_frame.encode_locally ();
 123
 124         gettimeofday (&after_encode, 0);
 125
 126         try {
 127                 encoded->send (socket);
 128         } catch (std::exception& e) {
 129                 cerr << "Send failed; frame " << dcp_video_frame.index() << "\n";
 130                 LOG_ERROR ("Send failed; frame %1", dcp_video_frame.index());
 131                 throw;
 132         }
 133
 134         return dcp_video_frame.index ();
 135 }
 136
 137 void
 138 Server::worker_thread ()
 139 {
 140         while (true) {
 141                 boost::mutex::scoped_lock lock (_worker_mutex);
 142                 while (_queue.empty () && !_terminate) {
 143                         _empty_condition.wait (lock);
 144                 }
 145
 146                 if (_terminate) {
 147                         return;
 148                 }
 149
 150                 shared_ptr<Socket> socket = _queue.front ();
 151                 _queue.pop_front ();
 152
 153                 lock.unlock ();
 154
 155                 int frame = -1;
 156                 string ip;
 157
 158                 struct timeval start;
 159                 struct timeval after_read;
 160                 struct timeval after_encode;
 161                 struct timeval end;
 162
 163                 gettimeofday (&start, 0);
 164
 165                 try {
 166                         frame = process (socket, after_read, after_encode);
 167                         ip = socket->socket().remote_endpoint().address().to_string();
 168                 } catch (std::exception& e) {
 169                         cerr << "Error: " << e.what() << "\n";
 170                         LOG_ERROR ("Error: %1", e.what());
 171                 }
 172
 173                 gettimeofday (&end, 0);
 174
 175                 socket.reset ();
 176
 177                 lock.lock ();
 178
 179                 if (frame >= 0) {
 180                         struct timeval end;
 181                         gettimeofday (&end, 0);
 182
 183                         stringstream message;
 184                         message.precision (2);
 185                         message << fixed
 186                                 << "Encoded frame " << frame << " from " << ip << ": "
 187                                 << "receive " << (seconds(after_read) - seconds(start)) << "s "
 188                                 << "encode " << (seconds(after_encode) - seconds(after_read)) << "s "
 189                                 << "send " << (seconds(end) - seconds(after_encode)) << "s.";
 190
 191                         if (_verbose) {
 192                                 cout << message.str() << "\n";
 193                         }
 194
 195                         LOG_GENERAL_NC (message.str ());
 196                 }
 197
 198                 _full_condition.notify_all ();
 199         }
 200 }
 201
 202 void
 203 Server::run (int num_threads)
 204 {
 205         LOG_GENERAL ("Server starting with %1 threads", num_threads);
 206         if (_verbose) {
 207                 cout << "DCP-o-matic server starting with " << num_threads << " threads.\n";
 208         }
 209
 210         for (int i = 0; i < num_threads; ++i) {
 211                 _worker_threads.push_back (new thread (bind (&Server::worker_thread, this)));
 212         }
 213
 214         _broadcast.thread = new thread (bind (&Server::broadcast_thread, this));
 215
 216         start_accept ();
 217         _io_service.run ();
 218 }
 219
 220 void
 221 Server::broadcast_thread ()
 222 try
 223 {
 224         boost::asio::ip::address address = boost::asio::ip::address_v4::any ();
 225         boost::asio::ip::udp::endpoint listen_endpoint (address, Config::instance()->server_port_base() + 1);
 226
 227         _broadcast.socket = new boost::asio::ip::udp::socket (_broadcast.io_service);
 228         _broadcast.socket->open (listen_endpoint.protocol ());
 229         _broadcast.socket->bind (listen_endpoint);
 230
 231         _broadcast.socket->async_receive_from (
 232                 boost::asio::buffer (_broadcast.buffer, sizeof (_broadcast.buffer)),
 233                 _broadcast.send_endpoint,
 234                 boost::bind (&Server::broadcast_received, this)
 235                 );
 236
 237         _broadcast.io_service.run ();
 238 }
 239 catch (...)
 240 {
 241         store_current ();
 242 }
 243
 244 void
 245 Server::broadcast_received ()
 246 {
 247         _broadcast.buffer[sizeof(_broadcast.buffer) - 1] = '\0';
 248
 249         if (strcmp (_broadcast.buffer, DCPOMATIC_HELLO) == 0) {
 250                 /* Reply to the client saying what we can do */
 251                 xmlpp::Document doc;
 252                 xmlpp::Element* root = doc.create_root_node ("ServerAvailable");
 253                 root->add_child("Threads")->add_child_text (raw_convert<string> (_worker_threads.size ()));
 254                 stringstream xml;
 255                 doc.write_to_stream (xml, "UTF-8");
 256
 257                 shared_ptr<Socket> socket (new Socket);
 258                 try {
 259                         socket->connect (boost::asio::ip::tcp::endpoint (_broadcast.send_endpoint.address(), Config::instance()->server_port_base() + 1));
 260                         socket->write (xml.str().length() + 1);
 261                         socket->write ((uint8_t *) xml.str().c_str(), xml.str().length() + 1);
 262                 } catch (...) {
 263
 264                 }
 265         }
 266
 267         _broadcast.socket->async_receive_from (
 268                 boost::asio::buffer (_broadcast.buffer, sizeof (_broadcast.buffer)),
 269                 _broadcast.send_endpoint, boost::bind (&Server::broadcast_received, this)
 270                 );
 271 }
 272
 273 void
 274 Server::start_accept ()
 275 {
 276         if (_terminate) {
 277                 return;
 278         }
 279
 280         shared_ptr<Socket> socket (new Socket);
 281         _acceptor.async_accept (socket->socket (), boost::bind (&Server::handle_accept, this, socket, boost::asio::placeholders::error));
 282 }
 283
 284 void
 285 Server::handle_accept (shared_ptr<Socket> socket, boost::system::error_code const & error)
 286 {
 287         if (error) {
 288                 return;
 289         }
 290
 291         boost::mutex::scoped_lock lock (_worker_mutex);
 292
 293         /* Wait until the queue has gone down a bit */
 294         while (_queue.size() >= _worker_threads.size() * 2 && !_terminate) {
 295                 _full_condition.wait (lock);
 296         }
 297
 298         _queue.push_back (socket);
 299         _empty_condition.notify_all ();
 300
 301         start_accept ();
 302 }
 303