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 boost::shared_ptr;
  51 using boost::algorithm::is_any_of;
  52 using boost::algorithm::split;
  53 using boost::thread;
  54 using boost::bind;
  55 using boost::scoped_array;
  56 using boost::optional;
  57 using boost::lexical_cast;
  58 using libdcp::Size;
  59
  60 ServerDescription::ServerDescription (shared_ptr<const cxml::Node> node)
  61 {
  62         _host_name = node->string_child ("HostName");
  63         _threads = node->number_child<int> ("Threads");
  64 }
  65
  66 void
  67 ServerDescription::as_xml (xmlpp::Node* root) const
  68 {
  69         root->add_child("HostName")->add_child_text (_host_name);
  70         root->add_child("Threads")->add_child_text (boost::lexical_cast<string> (_threads));
  71 }
  72
  73 /** Create a server description from a string of metadata returned from as_metadata().
  74  *  @param v Metadata.
  75  *  @return ServerDescription, or 0.
  76  */
  77 optional<ServerDescription>
  78 ServerDescription::create_from_metadata (string v)
  79 {
  80         vector<string> b;
  81         split (b, v, is_any_of (" "));
  82
  83         if (b.size() != 2) {
  84                 return optional<ServerDescription> ();
  85         }
  86
  87         return ServerDescription (b[0], atoi (b[1].c_str ()));
  88 }
  89
  90 Server::Server (shared_ptr<Log> log, bool verbose)
  91         : _log (log)
  92         , _verbose (verbose)
  93 {
  94
  95 }
  96
  97 int
  98 Server::process (shared_ptr<Socket> socket)
  99 {
 100         uint32_t length = socket->read_uint32 ();
 101         scoped_array<char> buffer (new char[length]);
 102         socket->read (reinterpret_cast<uint8_t*> (buffer.get()), length);
 103
 104         stringstream s (buffer.get());
 105         shared_ptr<cxml::Document> xml (new cxml::Document ("EncodingRequest"));
 106         xml->read_stream (s);
 107         if (xml->number_child<int> ("Version") != SERVER_LINK_VERSION) {
 108                 cerr << "Mismatched server/client versions\n";
 109                 _log->log ("Mismatched server/client versions");
 110                 return -1;
 111         }
 112
 113         libdcp::Size size (
 114                 xml->number_child<int> ("Width"), xml->number_child<int> ("Height")
 115                 );
 116
 117         shared_ptr<Image> image (new Image (PIX_FMT_RGB24, size, true));
 118
 119         image->read_from_socket (socket);
 120         DCPVideoFrame dcp_video_frame (image, xml, _log);
 121
 122         shared_ptr<EncodedData> encoded = dcp_video_frame.encode_locally ();
 123         try {
 124                 encoded->send (socket);
 125         } catch (std::exception& e) {
 126                 _log->log (String::compose (
 127                                    "Send failed; frame %1, data size %2, pixel format %3, image size %4x%5, %6 components",
 128                                    dcp_video_frame.frame(), encoded->size(), image->pixel_format(), image->size().width, image->size().height, image->components()
 129                                    )
 130                         );
 131                 throw;
 132         }
 133
 134         return dcp_video_frame.frame ();
 135 }
 136
 137 void
 138 Server::worker_thread ()
 139 {
 140         while (1) {
 141                 boost::mutex::scoped_lock lock (_worker_mutex);
 142                 while (_queue.empty ()) {
 143                         _worker_condition.wait (lock);
 144                 }
 145
 146                 shared_ptr<Socket> socket = _queue.front ();
 147                 _queue.pop_front ();
 148
 149                 lock.unlock ();
 150
 151                 int frame = -1;
 152
 153                 struct timeval start;
 154                 gettimeofday (&start, 0);
 155
 156                 try {
 157                         frame = process (socket);
 158                 } catch (std::exception& e) {
 159                         _log->log (String::compose ("Error: %1", e.what()));
 160                 }
 161
 162                 string const ip = socket->socket().remote_endpoint().address().to_string();
 163                 socket.reset ();
 164
 165                 lock.lock ();
 166
 167                 if (frame >= 0) {
 168                         struct timeval end;
 169                         gettimeofday (&end, 0);
 170
 171                         string const message = String::compose (
 172                                 "Encoded frame %1 from %2 in %3s", frame, ip, seconds(end) - seconds(start)
 173                                 );
 174
 175                         if (_verbose) {
 176                                 cout << message << "\n";
 177                         }
 178
 179                         _log->log (message);
 180                 }
 181
 182                 _worker_condition.notify_all ();
 183         }
 184 }
 185
 186 void
 187 Server::run (int num_threads)
 188 {
 189         _log->log (String::compose ("Server starting with %1 threads", num_threads));
 190         if (_verbose) {
 191                 cout << "DCP-o-matic server started with " << num_threads << " threads.\n";
 192         }
 193
 194         for (int i = 0; i < num_threads; ++i) {
 195                 _worker_threads.push_back (new thread (bind (&Server::worker_thread, this)));
 196         }
 197
 198         _broadcast.thread = new thread (bind (&Server::broadcast_thread, this));
 199
 200         boost::asio::io_service io_service;
 201
 202         boost::asio::ip::tcp::acceptor acceptor (
 203                 io_service,
 204                 boost::asio::ip::tcp::endpoint (boost::asio::ip::tcp::v4(), Config::instance()->server_port_base ())
 205                 );
 206
 207         while (1) {
 208                 shared_ptr<Socket> socket (new Socket);
 209                 acceptor.accept (socket->socket ());
 210
 211                 boost::mutex::scoped_lock lock (_worker_mutex);
 212
 213                 /* Wait until the queue has gone down a bit */
 214                 while (int (_queue.size()) >= num_threads * 2) {
 215                         _worker_condition.wait (lock);
 216                 }
 217
 218                 _queue.push_back (socket);
 219                 _worker_condition.notify_all ();
 220         }
 221 }
 222
 223 void
 224 Server::broadcast_thread ()
 225 {
 226         boost::asio::io_service io_service;
 227
 228         boost::asio::ip::address address = boost::asio::ip::address_v4::any ();
 229         boost::asio::ip::udp::endpoint listen_endpoint (address, Config::instance()->server_port_base() + 1);
 230
 231         _broadcast.socket = new boost::asio::ip::udp::socket (io_service);
 232         _broadcast.socket->open (listen_endpoint.protocol ());
 233         _broadcast.socket->bind (listen_endpoint);
 234
 235         _broadcast.socket->async_receive_from (
 236                 boost::asio::buffer (_broadcast.buffer, sizeof (_broadcast.buffer)),
 237                 _broadcast.send_endpoint,
 238                 boost::bind (&Server::broadcast_received, this)
 239                 );
 240
 241         io_service.run ();
 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 (lexical_cast<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 }