src/lib/server.cc

   1 /*
   2     Copyright (C) 2012 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_frame.h"
  38 #include "config.h"
  39 #include "cross.h"
  40
  41 #include "i18n.h"
  42
  43 using std::string;
  44 using std::stringstream;
  45 using std::multimap;
  46 using std::vector;
  47 using std::list;
  48 using std::cout;
  49 using std::cerr;
  50 using std::setprecision;
  51 using std::fixed;
  52 using boost::shared_ptr;
  53 using boost::algorithm::is_any_of;
  54 using boost::algorithm::split;
  55 using boost::thread;
  56 using boost::bind;
  57 using boost::scoped_array;
  58 using boost::optional;
  59 using dcp::Size;
  60 using dcp::raw_convert;
  61
  62 Server::Server (shared_ptr<Log> log, bool verbose)
  63         : _log (log)
  64         , _verbose (verbose)
  65 {
  66
  67 }
  68
  69 /** @param after_read Filled in with gettimeofday() after reading the input from the network.
  70  *  @param after_encode Filled in with gettimeofday() after encoding the image.
  71  */
  72 int
  73 Server::process (shared_ptr<Socket> socket, struct timeval& after_read, struct timeval& after_encode)
  74 {
  75         uint32_t length = socket->read_uint32 ();
  76         scoped_array<char> buffer (new char[length]);
  77         socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
  78
  79         stringstream s (buffer.get());
  80         shared_ptr<cxml::Document> xml (new cxml::Document ("EncodingRequest"));
  81         xml->read_stream (s);
  82         if (xml->number_child<int> ("Version") != SERVER_LINK_VERSION) {
  83                 cerr << "Mismatched server/client versions\n";
  84                 _log->log ("Mismatched server/client versions");
  85                 return -1;
  86         }
  87
  88         dcp::Size size (
  89                 xml->number_child<int> ("Width"), xml->number_child<int> ("Height")
  90                 );
  91
  92         shared_ptr<Image> image (new Image (PIX_FMT_RGB24, size, true));
  93
  94         image->read_from_socket (socket);
  95         DCPVideoFrame dcp_video_frame (image, xml, _log);
  96
  97         gettimeofday (&after_read, 0);
  98
  99         shared_ptr<EncodedData> encoded = dcp_video_frame.encode_locally ();
 100
 101         gettimeofday (&after_encode, 0);
 102
 103         try {
 104                 encoded->send (socket);
 105         } catch (std::exception& e) {
 106                 _log->log (String::compose (
 107                                    "Send failed; frame %1, data size %2, pixel format %3, image size %4x%5, %6 components",
 108                                    dcp_video_frame.frame(), encoded->size(), image->pixel_format(), image->size().width, image->size().height, image->components()
 109                                    )
 110                         );
 111                 throw;
 112         }
 113
 114         return dcp_video_frame.frame ();
 115 }
 116
 117 void
 118 Server::worker_thread ()
 119 {
 120         while (1) {
 121                 boost::mutex::scoped_lock lock (_worker_mutex);
 122                 while (_queue.empty ()) {
 123                         _worker_condition.wait (lock);
 124                 }
 125
 126                 shared_ptr<Socket> socket = _queue.front ();
 127                 _queue.pop_front ();
 128
 129                 lock.unlock ();
 130
 131                 int frame = -1;
 132                 string ip;
 133
 134                 struct timeval start;
 135                 struct timeval after_read;
 136                 struct timeval after_encode;
 137                 struct timeval end;
 138
 139                 gettimeofday (&start, 0);
 140
 141                 try {
 142                         frame = process (socket, after_read, after_encode);
 143                         ip = socket->socket().remote_endpoint().address().to_string();
 144                 } catch (std::exception& e) {
 145                         _log->log (String::compose ("Error: %1", e.what()));
 146                 }
 147
 148                 gettimeofday (&end, 0);
 149
 150                 socket.reset ();
 151
 152                 lock.lock ();
 153
 154                 if (frame >= 0) {
 155                         struct timeval end;
 156                         gettimeofday (&end, 0);
 157
 158                         stringstream message;
 159                         message.precision (2);
 160                         message << fixed
 161                                 << "Encoded frame " << frame << " from " << ip << ": "
 162                                 << "receive " << (seconds(after_read) - seconds(start)) << "s "
 163                                 << "encode " << (seconds(after_encode) - seconds(after_read)) << "s "
 164                                 << "send " << (seconds(end) - seconds(after_encode)) << "s.";
 165
 166                         if (_verbose) {
 167                                 cout << message.str() << "\n";
 168                         }
 169
 170                         _log->log (message.str ());
 171                 }
 172
 173                 _worker_condition.notify_all ();
 174         }
 175 }
 176
 177 void
 178 Server::run (int num_threads)
 179 {
 180         _log->log (String::compose ("Server starting with %1 threads", num_threads));
 181         if (_verbose) {
 182                 cout << "DCP-o-matic server starting with " << num_threads << " threads.\n";
 183         }
 184
 185         for (int i = 0; i < num_threads; ++i) {
 186                 _worker_threads.push_back (new thread (bind (&Server::worker_thread, this)));
 187         }
 188
 189         _broadcast.thread = new thread (bind (&Server::broadcast_thread, this));
 190
 191         boost::asio::io_service io_service;
 192
 193         boost::asio::ip::tcp::acceptor acceptor (
 194                 io_service,
 195                 boost::asio::ip::tcp::endpoint (boost::asio::ip::tcp::v4(), Config::instance()->server_port_base ())
 196                 );
 197
 198         while (1) {
 199                 shared_ptr<Socket> socket (new Socket);
 200                 acceptor.accept (socket->socket ());
 201
 202                 boost::mutex::scoped_lock lock (_worker_mutex);
 203
 204                 /* Wait until the queue has gone down a bit */
 205                 while (int (_queue.size()) >= num_threads * 2) {
 206                         _worker_condition.wait (lock);
 207                 }
 208
 209                 _queue.push_back (socket);
 210                 _worker_condition.notify_all ();
 211         }
 212 }
 213
 214 void
 215 Server::broadcast_thread ()
 216 try
 217 {
 218         boost::asio::io_service io_service;
 219
 220         boost::asio::ip::address address = boost::asio::ip::address_v4::any ();
 221         boost::asio::ip::udp::endpoint listen_endpoint (address, Config::instance()->server_port_base() + 1);
 222
 223         _broadcast.socket = new boost::asio::ip::udp::socket (io_service);
 224         _broadcast.socket->open (listen_endpoint.protocol ());
 225         _broadcast.socket->bind (listen_endpoint);
 226
 227         _broadcast.socket->async_receive_from (
 228                 boost::asio::buffer (_broadcast.buffer, sizeof (_broadcast.buffer)),
 229                 _broadcast.send_endpoint,
 230                 boost::bind (&Server::broadcast_received, this)
 231                 );
 232
 233         io_service.run ();
 234 }
 235 catch (...)
 236 {
 237         store_current ();
 238 }
 239
 240 void
 241 Server::broadcast_received ()
 242 {
 243         _broadcast.buffer[sizeof(_broadcast.buffer) - 1] = '\0';
 244
 245         if (strcmp (_broadcast.buffer, DCPOMATIC_HELLO) == 0) {
 246                 /* Reply to the client saying what we can do */
 247                 xmlpp::Document doc;
 248                 xmlpp::Element* root = doc.create_root_node ("ServerAvailable");
 249                 root->add_child("Threads")->add_child_text (raw_convert<string> (_worker_threads.size ()));
 250                 stringstream xml;
 251                 doc.write_to_stream (xml, "UTF-8");
 252
 253                 shared_ptr<Socket> socket (new Socket);
 254                 try {
 255                         socket->connect (boost::asio::ip::tcp::endpoint (_broadcast.send_endpoint.address(), Config::instance()->server_port_base() + 1));
 256                         socket->write (xml.str().length() + 1);
 257                         socket->write ((uint8_t *) xml.str().c_str(), xml.str().length() + 1);
 258                 } catch (...) {
 259
 260                 }
 261         }
 262
 263         _broadcast.socket->async_receive_from (
 264                 boost::asio::buffer (_broadcast.buffer, sizeof (_broadcast.buffer)),
 265                 _broadcast.send_endpoint, boost::bind (&Server::broadcast_received, this)
 266                 );
 267 }