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/lexical_cast.hpp>
  31 #include <boost/scoped_array.hpp>
  32 #include <libcxml/cxml.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 boost::lexical_cast;
  60 using libdcp::Size;
  61
  62 ServerDescription::ServerDescription (shared_ptr<const cxml::Node> node)
  63 {
  64         _host_name = node->string_child ("HostName");
  65         _threads = node->number_child<int> ("Threads");
  66 }
  67
  68 void
  69 ServerDescription::as_xml (xmlpp::Node* root) const
  70 {
  71         root->add_child("HostName")->add_child_text (_host_name);
  72         root->add_child("Threads")->add_child_text (boost::lexical_cast<string> (_threads));
  73 }
  74
  75 /** Create a server description from a string of metadata returned from as_metadata().
  76  *  @param v Metadata.
  77  *  @return ServerDescription, or 0.
  78  */
  79 optional<ServerDescription>
  80 ServerDescription::create_from_metadata (string v)
  81 {
  82         vector<string> b;
  83         split (b, v, is_any_of (" "));
  84
  85         if (b.size() != 2) {
  86                 return optional<ServerDescription> ();
  87         }
  88
  89         return ServerDescription (b[0], atoi (b[1].c_str ()));
  90 }
  91
  92 Server::Server (shared_ptr<Log> log, bool verbose)
  93         : _log (log)
  94         , _verbose (verbose)
  95 {
  96
  97 }
  98
  99 /** @param after_read Filled in with gettimeofday() after reading the input from the network.
 100  *  @param after_encode Filled in with gettimeofday() after encoding the image.
 101  */
 102 int
 103 Server::process (shared_ptr<Socket> socket, struct timeval& after_read, struct timeval& after_encode)
 104 {
 105         uint32_t length = socket->read_uint32 ();
 106         scoped_array<char> buffer (new char[length]);
 107         socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
 108
 109         stringstream s (buffer.get());
 110         shared_ptr<cxml::Document> xml (new cxml::Document ("EncodingRequest"));
 111         xml->read_stream (s);
 112         if (xml->number_child<int> ("Version") != SERVER_LINK_VERSION) {
 113                 cerr << "Mismatched server/client versions\n";
 114                 _log->log ("Mismatched server/client versions");
 115                 return -1;
 116         }
 117
 118         libdcp::Size size (
 119                 xml->number_child<int> ("Width"), xml->number_child<int> ("Height")
 120                 );
 121
 122         shared_ptr<Image> image (new Image (PIX_FMT_RGB24, size, true));
 123
 124         image->read_from_socket (socket);
 125         DCPVideoFrame dcp_video_frame (image, xml, _log);
 126
 127         gettimeofday (&after_read, 0);
 128
 129         shared_ptr<EncodedData> encoded = dcp_video_frame.encode_locally ();
 130
 131         gettimeofday (&after_encode, 0);
 132
 133         try {
 134                 encoded->send (socket);
 135         } catch (std::exception& e) {
 136                 _log->log (String::compose (
 137                                    "Send failed; frame %1, data size %2, pixel format %3, image size %4x%5, %6 components",
 138                                    dcp_video_frame.frame(), encoded->size(), image->pixel_format(), image->size().width, image->size().height, image->components()
 139                                    )
 140                         );
 141                 throw;
 142         }
 143
 144         return dcp_video_frame.frame ();
 145 }
 146
 147 void
 148 Server::worker_thread ()
 149 {
 150         while (1) {
 151                 boost::mutex::scoped_lock lock (_worker_mutex);
 152                 while (_queue.empty ()) {
 153                         _worker_condition.wait (lock);
 154                 }
 155
 156                 shared_ptr<Socket> socket = _queue.front ();
 157                 _queue.pop_front ();
 158
 159                 lock.unlock ();
 160
 161                 int frame = -1;
 162                 string ip;
 163
 164                 struct timeval start;
 165                 struct timeval after_read;
 166                 struct timeval after_encode;
 167                 struct timeval end;
 168
 169                 gettimeofday (&start, 0);
 170
 171                 try {
 172                         frame = process (socket, after_read, after_encode);
 173                         ip = socket->socket().remote_endpoint().address().to_string();
 174                 } catch (std::exception& e) {
 175                         _log->log (String::compose ("Error: %1", e.what()));
 176                 }
 177
 178                 gettimeofday (&end, 0);
 179
 180                 socket.reset ();
 181
 182                 lock.lock ();
 183
 184                 if (frame >= 0) {
 185                         struct timeval end;
 186                         gettimeofday (&end, 0);
 187
 188                         stringstream message;
 189                         message.precision (2);
 190                         message << fixed
 191                                 << "Encoded frame " << frame << " from " << ip << ": "
 192                                 << "receive " << (seconds(after_read) - seconds(start)) << "s "
 193                                 << "encode " << (seconds(after_encode) - seconds(after_read)) << "s "
 194                                 << "send " << (seconds(end) - seconds(after_encode)) << "s.";
 195
 196                         if (_verbose) {
 197                                 cout << message.str() << "\n";
 198                         }
 199
 200                         _log->log (message.str ());
 201                 }
 202
 203                 _worker_condition.notify_all ();
 204         }
 205 }
 206
 207 void
 208 Server::run (int num_threads)
 209 {
 210         _log->log (String::compose ("Server starting with %1 threads", num_threads));
 211         if (_verbose) {
 212                 cout << "DCP-o-matic server started with " << num_threads << " threads.\n";
 213         }
 214
 215         for (int i = 0; i < num_threads; ++i) {
 216                 _worker_threads.push_back (new thread (bind (&Server::worker_thread, this)));
 217         }
 218
 219         _broadcast.thread = new thread (bind (&Server::broadcast_thread, this));
 220
 221         boost::asio::io_service io_service;
 222
 223         boost::asio::ip::tcp::acceptor acceptor (
 224                 io_service,
 225                 boost::asio::ip::tcp::endpoint (boost::asio::ip::tcp::v4(), Config::instance()->server_port_base ())
 226                 );
 227
 228         while (1) {
 229                 shared_ptr<Socket> socket (new Socket);
 230                 acceptor.accept (socket->socket ());
 231
 232                 boost::mutex::scoped_lock lock (_worker_mutex);
 233
 234                 /* Wait until the queue has gone down a bit */
 235                 while (int (_queue.size()) >= num_threads * 2) {
 236                         _worker_condition.wait (lock);
 237                 }
 238
 239                 _queue.push_back (socket);
 240                 _worker_condition.notify_all ();
 241         }
 242 }
 243
 244 void
 245 Server::broadcast_thread ()
 246 {
 247         boost::asio::io_service io_service;
 248
 249         boost::asio::ip::address address = boost::asio::ip::address_v4::any ();
 250         boost::asio::ip::udp::endpoint listen_endpoint (address, Config::instance()->server_port_base() + 1);
 251
 252         _broadcast.socket = new boost::asio::ip::udp::socket (io_service);
 253         _broadcast.socket->open (listen_endpoint.protocol ());
 254         _broadcast.socket->bind (listen_endpoint);
 255
 256         _broadcast.socket->async_receive_from (
 257                 boost::asio::buffer (_broadcast.buffer, sizeof (_broadcast.buffer)),
 258                 _broadcast.send_endpoint,
 259                 boost::bind (&Server::broadcast_received, this)
 260                 );
 261
 262         io_service.run ();
 263 }
 264
 265 void
 266 Server::broadcast_received ()
 267 {
 268         _broadcast.buffer[sizeof(_broadcast.buffer) - 1] = '\0';
 269
 270         if (strcmp (_broadcast.buffer, DCPOMATIC_HELLO) == 0) {
 271                 /* Reply to the client saying what we can do */
 272                 xmlpp::Document doc;
 273                 xmlpp::Element* root = doc.create_root_node ("ServerAvailable");
 274                 root->add_child("Threads")->add_child_text (lexical_cast<string> (_worker_threads.size ()));
 275                 stringstream xml;
 276                 doc.write_to_stream (xml, "UTF-8");
 277
 278                 shared_ptr<Socket> socket (new Socket);
 279                 try {
 280                         socket->connect (boost::asio::ip::tcp::endpoint (_broadcast.send_endpoint.address(), Config::instance()->server_port_base() + 1));
 281                         socket->write (xml.str().length() + 1);
 282                         socket->write ((uint8_t *) xml.str().c_str(), xml.str().length() + 1);
 283                 } catch (...) {
 284
 285                 }
 286         }
 287
 288         _broadcast.socket->async_receive_from (
 289                 boost::asio::buffer (_broadcast.buffer, sizeof (_broadcast.buffer)),
 290                 _broadcast.send_endpoint, boost::bind (&Server::broadcast_received, this)
 291                 );
 292 }