<?php
/**
 * A TCP connection helper class
 *
 * @author		Roland Haeder <webmaster@ship-simu.org>
 * @version		0.0.0
 * @copyright	Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2011 Core Developer Team
 * @license		GNU GPL 3.0 or any newer version
 * @link		http://www.ship-simu.org
 * @todo		Find an interface for hub helper
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
class TcpConnectionHelper extends BaseConnectionHelper implements Helper {
	/**
	 * Protected constructor
	 *
	 * @return	void
	 */
	protected function __construct () {
		// Call parent constructor
		parent::__construct(__CLASS__);

		// Set protocol
		$this->setProtocol('tcp');
	}

	/**
	 * Creates a socket resource ("connection") for given recipient in package data
	 *
	 * @param	$packageData		Raw package data
	 * @return	$socketResource		Socket resource
	 * @throws	InvalidSocketException	If the socket is invalid
	 */
	public static function createConnectionFromPackageData (array $packageData) {
		// Create an instance
		$helperInstance = new TcpConnectionHelper();

		// Create a socket instance
		$socketResource = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

		// Is the socket resource valid?
		if (!is_resource($socketResource)) {
			// Something bad happened
			throw new InvalidSocketException(array($helperInstance, gettype($socketResource), 0, 'invalid'), BaseListener::EXCEPTION_INVALID_SOCKET);
		} // END - if

		// Get socket error code for verification
		$socketError = socket_last_error($socketResource);

		// Check if there was an error else
		if ($socketError > 0) {
			// Then throw again
			throw new InvalidSocketException(array($helperInstance, gettype($socketResource), $socketError, socket_strerror($socketError)), BaseListener::EXCEPTION_INVALID_SOCKET);
		} // END - if

		// Set the option to reuse the port
		if (!socket_set_option($socketResource, SOL_SOCKET, SO_REUSEADDR, 1)) {
			// Get socket error code for verification
			$socketError = socket_last_error($socketResource);

			// Get error message
			$errorMessage = socket_strerror($socketError);

			// Shutdown this socket
			$helperInstance->shutdownSocket($socketResource);

			// And throw again
			throw new InvalidSocketException(array($helperInstance, gettype($socketResource), $socketError, $errorMessage), BaseListener::EXCEPTION_INVALID_SOCKET);
		} // END - if

		// Now, we want non-blocking mode
		if (!socket_set_nonblock($socketResource)) {
			// Get socket error code for verification
			$socketError = socket_last_error($socketResource);

			// Get error message
			$errorMessage = socket_strerror($socketError);

			// Shutdown this socket
			$helperInstance->shutdownSocket($socketResource);

			// And throw again
			throw new InvalidSocketException(array($helperInstance, gettype($socketResource), $socketError, $errorMessage), BaseListener::EXCEPTION_INVALID_SOCKET);
		} // END - if

		// Set the resource
		$helperInstance->setSocketResource($socketResource);

		// Resolve any session ids; 0 = IP, 1 = Port
		$recipientData = explode(':', HubTools::resolveSessionId($packageData['recipient']));

		// Set ip/port
		$helperInstance->setAddress($recipientData[0]);
		$helperInstance->setPort($recipientData[1]);

		// Debug message
		$helperInstance->debugOutput('CONNECTION: Connecting to ' . $recipientData[0] . ':' . $recipientData[1]);

		// Now connect to it
		if (!@socket_connect($socketResource, $recipientData[0], $recipientData[1])) {
			// Get socket error code for verification
			$socketError = socket_last_error($socketResource);

			// And throw again, but not for 'Operation now in progress', we should wait a little
			if ($socketError != 115) {
				// Get error message
				$errorMessage = socket_strerror($socketError);

				// Shutdown this socket
				$helperInstance->shutdownSocket($socketResource);

				// Throw it again
				throw new InvalidSocketException(array($helperInstance, gettype($socketResource), $socketError, $errorMessage), BaseListener::EXCEPTION_INVALID_SOCKET);
			} else {
				// Debug output
				$helperInstance->debugOutput('CONNECTION: Operation is in progress, this usual for non-blocking connections.');
			}
		} // END - if

		// Okay, that should be it. So return it...
		return $socketResource;
	}

	/**
	 * Do the shutdown sequence for TCP connections
	 *
	 * @todo	We may want to implement a filter for ease notification of other objects like our pool
	 * @return	void
	 * @throws	SocketShutdownException		If the current socket could not be shut down
	 */
	public function doShutdown () {
		// Clear any previous errors
		socket_clear_error($this->getSocketResource());

		// Call the shutdown function on the currently set socket
		if (!@socket_shutdown($this->getSocketResource())) {
			// Could not shutdown socket, this is fine if e.g. the other side is not connected, so analyse it
			if (socket_last_error($this->getSocketResource()) != 107) {
				// Something bad happened while we shutdown a socket
				throw new SocketShutdownException($this, BaseListener::EXCEPTION_INVALID_SOCKET);
			} // END - if
		} // END - if

		// Mark this connection as shutted down
		$this->markConnectionShutdown();
	}
}

// [EOF]
?>