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<?php
/**
* Cake Socket connection class.
*
* PHP 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package Cake.Network
* @since CakePHP(tm) v 1.2.0
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/
App::uses('Validation', 'Utility');
/**
* Cake network socket connection class.
*
* Core base class for network communication.
*
* @package Cake.Network
*/
class CakeSocket {
/**
* Object description
*
* @var string
*/
public $description = 'Remote DataSource Network Socket Interface';
/**
* Base configuration settings for the socket connection
*
* @var array
*/
protected $_baseConfig = array(
'persistent' => false,
'host' => 'localhost',
'protocol' => 'tcp',
'port' => 80,
'timeout' => 30
);
/**
* Configuration settings for the socket connection
*
* @var array
*/
public $config = array();
/**
* Reference to socket connection resource
*
* @var resource
*/
public $connection = null;
/**
* This boolean contains the current state of the CakeSocket class
*
* @var boolean
*/
public $connected = false;
/**
* This variable contains an array with the last error number (num) and string (str)
*
* @var array
*/
public $lastError = array();
/**
* Constructor.
*
* @param array $config Socket configuration, which will be merged with the base configuration
* @see CakeSocket::$_baseConfig
*/
public function __construct($config = array()) {
$this->config = array_merge($this->_baseConfig, $config);
if (!is_numeric($this->config['protocol'])) {
$this->config['protocol'] = getprotobyname($this->config['protocol']);
}
}
/**
* Connect the socket to the given host and port.
*
* @return boolean Success
* @throws SocketException
*/
public function connect() {
if ($this->connection != null) {
$this->disconnect();
}
$scheme = null;
if (isset($this->config['request']) && $this->config['request']['uri']['scheme'] == 'https') {
$scheme = 'ssl://';
}
if ($this->config['persistent'] == true) {
$this->connection = @pfsockopen($scheme . $this->config['host'], $this->config['port'], $errNum, $errStr, $this->config['timeout']);
} else {
$this->connection = @fsockopen($scheme . $this->config['host'], $this->config['port'], $errNum, $errStr, $this->config['timeout']);
}
if (!empty($errNum) || !empty($errStr)) {
$this->setLastError($errNum, $errStr);
throw new SocketException($errStr, $errNum);
}
$this->connected = is_resource($this->connection);
if ($this->connected) {
stream_set_timeout($this->connection, $this->config['timeout']);
}
return $this->connected;
}
/**
* Get the host name of the current connection.
*
* @return string Host name
*/
public function host() {
if (Validation::ip($this->config['host'])) {
return gethostbyaddr($this->config['host']);
}
return gethostbyaddr($this->address());
}
/**
* Get the IP address of the current connection.
*
* @return string IP address
*/
public function address() {
if (Validation::ip($this->config['host'])) {
return $this->config['host'];
}
return gethostbyname($this->config['host']);
}
/**
* Get all IP addresses associated with the current connection.
*
* @return array IP addresses
*/
public function addresses() {
if (Validation::ip($this->config['host'])) {
return array($this->config['host']);
}
return gethostbynamel($this->config['host']);
}
/**
* Get the last error as a string.
*
* @return string Last error
*/
public function lastError() {
if (!empty($this->lastError)) {
return $this->lastError['num'] . ': ' . $this->lastError['str'];
}
return null;
}
/**
* Set the last error.
*
* @param integer $errNum Error code
* @param string $errStr Error string
* @return void
*/
public function setLastError($errNum, $errStr) {
$this->lastError = array('num' => $errNum, 'str' => $errStr);
}
/**
* Write data to the socket.
*
* @param string $data The data to write to the socket
* @return boolean Success
*/
public function write($data) {
if (!$this->connected) {
if (!$this->connect()) {
return false;
}
}
$totalBytes = strlen($data);
for ($written = 0, $rv = 0; $written < $totalBytes; $written += $rv) {
$rv = fwrite($this->connection, substr($data, $written));
if ($rv === false || $rv === 0) {
return $written;
}
}
return $written;
}
/**
* Read data from the socket. Returns false if no data is available or no connection could be
* established.
*
* @param integer $length Optional buffer length to read; defaults to 1024
* @return mixed Socket data
*/
public function read($length = 1024) {
if (!$this->connected) {
if (!$this->connect()) {
return false;
}
}
if (!feof($this->connection)) {
$buffer = fread($this->connection, $length);
$info = stream_get_meta_data($this->connection);
if ($info['timed_out']) {
$this->setLastError(E_WARNING, __d('cake_dev', 'Connection timed out'));
return false;
}
return $buffer;
}
return false;
}
/**
* Disconnect the socket from the current connection.
*
* @return boolean Success
*/
public function disconnect() {
if (!is_resource($this->connection)) {
$this->connected = false;
return true;
}
$this->connected = !fclose($this->connection);
if (!$this->connected) {
$this->connection = null;
}
return !$this->connected;
}
/**
* Destructor, used to disconnect from current connection.
*
*/
public function __destruct() {
$this->disconnect();
}
/**
* Resets the state of this Socket instance to it's initial state (before Object::__construct got executed)
*
* @param array $state Array with key and values to reset
* @return boolean True on success
*/
public function reset($state = null) {
if (empty($state)) {
static $initalState = array();
if (empty($initalState)) {
$initalState = get_class_vars(__CLASS__);
}
$state = $initalState;
}
foreach ($state as $property => $value) {
$this->{$property} = $value;
}
return true;
}
}
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