application/hub/main/helper/connection/tcp/class_TcpConnectionHelper.php

   1 <?php
   2 /**
   3  * A TCP connection helper class
   4  *
   5  * @author              Roland Haeder <webmaster@ship-simu.org>
   6  * @version             0.0.0
   7  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2012 Core Developer Team
   8  * @license             GNU GPL 3.0 or any newer version
   9  * @link                http://www.ship-simu.org
  10  * @todo                Find an interface for hub helper
  11  *
  12  * This program is free software: you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation, either version 3 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  24  */
  25 class TcpConnectionHelper extends BaseConnectionHelper implements ConnectionHelper {
  26         /**
  27          * Protected constructor
  28          *
  29          * @return      void
  30          */
  31         protected function __construct () {
  32                 // Call parent constructor
  33                 parent::__construct(__CLASS__);
  34
  35                 // Set protocol
  36                 $this->setProtocol('tcp');
  37         }
  38
  39         /**
  40          * Creates a half-connected socket resource ("connection") for given
  41          * recipient in package data. After you called this method you still need to
  42          * connect to the other node.
  43          *
  44          * @param       $packageData            Raw package data
  45          * @return      $socketResource         Socket resource
  46          * @throws      SocketCreationException         If the socket could not be created
  47          * @throws      SocketOptionException           If a socket option could not be set
  48          * @throws      SocketConnectionException       If a connection could not be opened
  49          * @todo        $errorCode/-Message are now in handleSocketError()'s call-back methods
  50          */
  51         public static function createConnectionFromPackageData (array $packageData) {
  52                 // Create an instance
  53                 $helperInstance = new TcpConnectionHelper();
  54
  55                 // Create a socket instance
  56                 $socketResource = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
  57
  58                 // Is the socket resource valid?
  59                 if (!is_resource($socketResource)) {
  60                         /*
  61                          * Something bad happened, calling handleSocketError() is not
  62                          * possible here because that method would throw an
  63                          * InvalidSocketException back.
  64                          */
  65                         throw new SocketCreationException(array($helperInstance, gettype($socketResource)), BaseListener::EXCEPTION_SOCKET_CREATION_FAILED);
  66                 } // END - if
  67
  68                 // Get socket error code for verification
  69                 $socketError = socket_last_error($socketResource);
  70
  71                 // Check if there was an error else
  72                 if ($socketError > 0) {
  73                         // Handle this socket error with a faked recipientData array
  74                         $helperInstance->handleSocketError(__METHOD__, __LINE__, $socketResource, array('0.0.0.0', '0'));
  75
  76                         // Then throw again
  77                         throw new SocketCreationException(array($helperInstance, gettype($socketResource), $socketError, socket_strerror($socketError)), BaseListener::EXCEPTION_SOCKET_CREATION_FAILED);
  78                 } // END - if
  79
  80                 // Set the resource
  81                 $helperInstance->setSocketResource($socketResource);
  82
  83                 // Init connection
  84                 $helperInstance->initConnection();
  85
  86                 // @TODO The whole resolving part should be moved out and made more configurable
  87                 // Init recipient data
  88                 $recipientData = NULL;
  89
  90                 // Try to solve the recipient
  91                 try {
  92                         // Resolve any session ids; 0 = IP, 1 = Port
  93                         $recipientData = explode(':', HubTools::resolveSessionId($packageData[NetworkPackage::PACKAGE_DATA_RECIPIENT]));
  94                 } catch (NoValidHostnameException $e) {
  95                         // Debug message
  96                         self::createDebugInstance(__CLASS__)->debugOutput('CONNECTION-HELPER[' . __LINE__ . ']: Failed to resolve ' . $packageData[NetworkPackage::PACKAGE_DATA_RECIPIENT] . ':' . $e->getMessage());
  97
  98                         // Is the recipient equal as configured IP
  99                         if (substr($packageData[NetworkPackage::PACKAGE_DATA_RECIPIENT], 0, strlen($helperInstance->getConfigInstance()->getConfigEntry('external_ip'))) == $helperInstance->getConfigInstance()->getConfigEntry('external_ip')) {
 100                                 // This connects to ship-simu.org and requests /ip.php which will return our external IP number
 101                                 $recipientData[0] = ConsoleTools::determineExternalIp();
 102
 103                                 // Do we have hostname:ip match?
 104                                 if (strpos($packageData[NetworkPackage::PACKAGE_DATA_RECIPIENT], ':') === false) {
 105                                         // No hostname:ip!
 106                                         $helperInstance->debugInstance($packageData[NetworkPackage::PACKAGE_DATA_RECIPIENT] . ' does not contain ":". Please fix this.');
 107                                 } // END - if
 108
 109                                 // "explode" the hostname:ip, so index 1 will be the port number
 110                                 $recipientArray = explode(':', $packageData[NetworkPackage::PACKAGE_DATA_RECIPIENT]);
 111
 112                                 // Add the port
 113                                 $recipientData[1] = $recipientArray[1];
 114                         } else {
 115                                 // It doesn't match, we need to take care of this later
 116                                 $helperInstance->debugInstance($packageData[NetworkPackage::PACKAGE_DATA_RECIPIENT] . '!=' . $helperInstance->getConfigInstance()->getConfigEntry('external_ip'));
 117                         }
 118                 }
 119
 120                 // Set ip/port
 121                 $helperInstance->setAddress($recipientData[0]);
 122                 $helperInstance->setPort($recipientData[1]);
 123
 124                 // Now connect to it
 125                 if (!$helperInstance->connectToPeerByRecipientData($recipientData)) {
 126                         // Handle socket error
 127                         $helperInstance->handleSocketError(__METHOD__, __LINE__, $socketResource, $recipientData);
 128                 } // END - if
 129
 130                 // Okay, that should be it. Return it...
 131                 return $socketResource;
 132         }
 133
 134         /**
 135          * Do the shutdown sequence for this connection helper
 136          *
 137          * @return      void
 138          * @throws      SocketShutdownException         If the current socket could not be shut down
 139          * @todo        We may want to implement a filter for ease notification of other objects like our pool
 140          */
 141         public function doShutdown () {
 142                 // Debug message
 143                 self::createDebugInstance(__CLASS__)->debugOutput('HELPER[' . __LINE__ . ']: Shutting down socket resource ' . $this->getSocketResource());
 144
 145                 // Clear any previous errors
 146                 socket_clear_error($this->getSocketResource());
 147
 148                 // Call the shutdown function on the currently set socket
 149                 if (!socket_shutdown($this->getSocketResource())) {
 150                         // Could not shutdown socket, this is fine if e.g. the other side is not connected, so analyse it
 151                         if (socket_last_error($this->getSocketResource()) != 107) {
 152                                 // Something bad happened while we shutdown a socket
 153                                 throw new SocketShutdownException($this, BaseListener::EXCEPTION_INVALID_SOCKET);
 154                         } // END - if
 155                 } // END - if
 156
 157                 // Try to make blocking IO for socket_close()
 158                 socket_set_block($this->getSocketResource());
 159
 160                 // Drop all data (don't sent any on socket closure)
 161                 socket_set_option($this->getSocketResource(), SOL_SOCKET, SO_LINGER, array('l_onoff' => 1, 'l_linger' => 0));
 162
 163                 // Finally close socket to free some resources
 164                 socket_close($this->getSocketResource());
 165
 166                 // Mark this connection as shutted down
 167                 $this->markConnectionShuttedDown();
 168         }
 169 }
 170
 171 // [EOF]
 172 ?>