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