application/hub/main/listener/tcp/class_TcpListener.php

   1 <?php
   2 /**
   3  * A TCP connection listener
   4  *
   5  * @author              Roland Haeder <webmaster@ship-simu.org>
   6  * @version             0.0.0
   7  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 Hub Developer Team
   8  * @license             GNU GPL 3.0 or any newer version
   9  * @link                http://www.ship-simu.org
  10  *
  11  * This program is free software: you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation, either version 3 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  23  */
  24 class TcpListener extends BaseListener implements Listenable {
  25         /**
  26          * Protected constructor
  27          *
  28          * @return      void
  29          */
  30         protected function __construct () {
  31                 // Call parent constructor
  32                 parent::__construct(__CLASS__);
  33         }
  34
  35         /**
  36          * Creates an instance of this class
  37          *
  38          * @param       $nodeInstance           A NodeHelper instance
  39          * @return      $listenerInstance       An instance a prepared listener class
  40          */
  41         public final static function createTcpListener (NodeHelper $nodeInstance) {
  42                 // Get new instance
  43                 $listenerInstance = new TcpListener();
  44
  45                 // Set the application instance
  46                 $listenerInstance->setNodeInstance($nodeInstance);
  47
  48                 // Set the protocol to TCP
  49                 $listenerInstance->setProtocol('tcp');
  50
  51                 // Return the prepared instance
  52                 return $listenerInstance;
  53         }
  54
  55         /**
  56          * Initializes the listener by setting up the required socket server
  57          *
  58          * @return      void
  59          * @throws      InvalidSocketException  Thrown if the socket could not be initialized
  60          */
  61         public function initListener() {
  62                 // Create a streaming socket, of type TCP/IP
  63                 $mainSocket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
  64
  65                 // Is the socket resource valid?
  66                 if (!is_resource($mainSocket)) {
  67                         // Something bad happened
  68                         throw new InvalidSocketException(array($this, gettype($mainSocket), 0, 'invalid'), BaseListener::EXCEPTION_INVALID_SOCKET);
  69                 } // END - if
  70
  71                 // Get socket error code for verification
  72                 $socketError = socket_last_error($mainSocket);
  73
  74                 // Check if there was an error else
  75                 if ($socketError > 0) {
  76                         // Then throw again
  77                         throw new InvalidSocketException(array($this, gettype($mainSocket), $socketError, socket_strerror($socketError)), BaseListener::EXCEPTION_INVALID_SOCKET);
  78                 } // END - if
  79
  80                 // Set the option to reuse the port
  81                 if (!socket_set_option($mainSocket, SOL_SOCKET, SO_REUSEADDR, 1)) {
  82                         // Get socket error code for verification
  83                         $socketError = socket_last_error($mainSocket);
  84
  85                         // Get error message
  86                         $errorMessage = socket_strerror($socketError);
  87
  88                         // Shutdown this socket
  89                         $this->shutdownSocket($mainSocket);
  90
  91                         // And throw again
  92                         throw new InvalidSocketException(array($this, gettype($mainSocket), $socketError, $errorMessage), BaseListener::EXCEPTION_INVALID_SOCKET);
  93                 } // END - if
  94
  95                 // Now, we want non-blocking mode
  96                 $this->debugOutput('LISTENER: Setting non-blocking mode.');
  97                 if (!socket_set_nonblock($mainSocket)) {
  98                         // Get socket error code for verification
  99                         $socketError = socket_last_error($mainSocket);
 100
 101                         // Get error message
 102                         $errorMessage = socket_strerror($socketError);
 103
 104                         // Shutdown this socket
 105                         $this->shutdownSocket($mainSocket);
 106
 107                         // And throw again
 108                         throw new InvalidSocketException(array($this, gettype($mainSocket), $socketError, $errorMessage), BaseListener::EXCEPTION_INVALID_SOCKET);
 109                 } // END - if
 110
 111                 // "Bind" the socket to the given address, on given port so this means
 112                 // that all connections on this port are now our resposibility to
 113                 // send/recv data, disconnect, etc..
 114                 $this->debugOutput('LISTENER: Binding to address ' . $this->getListenAddress() . ':' . $this->getListenPort());
 115                 if (!socket_bind($mainSocket, $this->getListenAddress(), $this->getListenPort())) {
 116                         // Get socket error code for verification
 117                         $socketError = socket_last_error($mainSocket);
 118
 119                         // Get error message
 120                         $errorMessage = socket_strerror($socketError);
 121
 122                         // Shutdown this socket
 123                         $this->shutdownSocket($mainSocket);
 124
 125                         // And throw again
 126                         throw new InvalidSocketException(array($this, gettype($mainSocket), $socketError, $errorMessage), BaseListener::EXCEPTION_INVALID_SOCKET);
 127                 } // END - if
 128
 129                 // Start listen for connections
 130                 $this->debugOutput('LISTENER: Listening for connections.');
 131                 if (!socket_listen($mainSocket)) {
 132                         // Get socket error code for verification
 133                         $socketError = socket_last_error($mainSocket);
 134
 135                         // Get error message
 136                         $errorMessage = socket_strerror($socketError);
 137
 138                         // Shutdown this socket
 139                         $this->shutdownSocket($mainSocket);
 140
 141                         // And throw again
 142                         throw new InvalidSocketException(array($this, gettype($mainSocket), $socketError, $errorMessage), BaseListener::EXCEPTION_INVALID_SOCKET);
 143                 } // END - if
 144
 145                 // Set the main socket
 146                 $this->setSocketResource($mainSocket);
 147
 148                 // Initialize the client pool instance
 149                 $poolInstance = ObjectFactory::createObjectByConfiguredName('client_pool_class', array($this));
 150
 151                 // Add main socket
 152                 $poolInstance->addClient($mainSocket);
 153
 154                 // And add it to this listener
 155                 $this->setPoolInstance($poolInstance);
 156
 157                 // Initialize iterator for listening on packages
 158                 $iteratorInstance = ObjectFactory::createObjectByConfiguredName('network_listen_iterator_class', array($poolInstance->getPoolEntriesInstance()));
 159
 160                 // Rewind it and remember it in this class
 161                 $iteratorInstance->rewind();
 162                 $this->setIteratorInstance($iteratorInstance);
 163
 164                 // Initialize the network package handler
 165                 $packageInstance = ObjectFactory::createObjectByConfiguredName('tcp_network_package_handler_class');
 166
 167                 // Set it in this class
 168                 $this->setPackageInstance($packageInstance);
 169
 170                 // Output message
 171                 $this->debugOutput('LISTENER: TCP listener now ready on IP ' . $this->getListenAddress() . ', port ' . $this->getListenPort() . ' for service.');
 172         }
 173
 174         /**
 175          * "Listens" for incoming network packages
 176          *
 177          * @return      void
 178          */
 179         public function doListen () {
 180                 // Get all readers
 181                 $readers = $this->getPoolInstance()->getAllSockets();
 182                 $writers = array();
 183                 $excepts = array();
 184
 185                 // Check if we have some clients left
 186                 $left = socket_select(
 187                         $readers,
 188                         $writers,
 189                         $excepts,
 190                         0,
 191                         150
 192                 );
 193
 194                 // Some new clients found?
 195                 if ($left < 1) {
 196                         // Nothing new found
 197                         return;
 198                 } // END - if
 199
 200                 // Do we have changed clients?
 201                 if (in_array($this->getSocketResource(), $readers)) {
 202                         // Then accept it
 203                         $newSocket = socket_accept($this->getSocketResource());
 204
 205                         // We want non-blocking here, too
 206                         if (!socket_set_nonblock($newSocket)) {
 207                                 // Get socket error code for verification
 208                                 $socketError = socket_last_error($newSocket);
 209
 210                                 // Get error message
 211                                 $errorMessage = socket_strerror($socketError);
 212
 213                                 // Shutdown this socket
 214                                 $this->shutdownSocket($newSocket);
 215
 216                                 // And throw again
 217                                 throw new InvalidSocketException(array($this, gettype($newSocket), $socketError, $errorMessage), BaseListener::EXCEPTION_INVALID_SOCKET);
 218                         } // END - if
 219
 220                         // Add it to the clients
 221                         $this->getPoolInstance()->addClient($newSocket);
 222                 } // END - if
 223
 224                 // Do we have to rewind?
 225                 if (!$this->getIteratorInstance()->valid()) {
 226                         // Rewind the list
 227                         $this->getIteratorInstance()->rewind();
 228                 } // END - if
 229
 230                 // Get the current value
 231                 $current = $this->getIteratorInstance()->current();
 232
 233                 // Handle it here, if not main socket
 234                 if ($current !== $this->getSocketResource()) {
 235                         // ... or else it will raise warnings like 'Transport endpoint is not connected'
 236                         $this->getPackageInstance()->processResourcePackage($current);
 237                 } // END - if
 238
 239                 // Advance to next entry. This should be the last line
 240                 $this->getIteratorInstance()->next();
 241         }
 242 }
 243
 244 // [EOF]
 245 ?>