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Server.php
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Server.php
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<?php
/**
* This code is free software; you can redistribute it and/or modify it under
* the terms of the new BSD License.
*
* Copyright (c) 2011, Sebastian Staudt
*
* @license http://www.opensource.org/licenses/bsd-license.php New BSD License
*/
/**
* This class is subclassed by all classes implementing server functionality
*
* It provides basic name resolution features and the ability to rotate
* between different IP addresses belonging to a single DNS name.
*
* @author Sebastian Staudt
* @package steam-condenser
* @subpackage servers
*/
abstract class Server {
/**
* @var array The currently selected IP address of this server
*/
protected $ipAddress;
/**
* @var array The IP addresses of this server
*/
protected $ipAddresses;
/**
* @var int The index of the currently selected IP address
*/
protected $ipIndex;
/**
* @var int The port of this server
*/
protected $port;
/**
* Creates a new server instance with the given address and port
*
* @param string $address Either an IP address, a DNS name or one of them
* combined with the port number. If a port number is given, e.g.
* 'server.example.com:27016' it will override the second argument.
* @param int $port The port the server is listening on
* @see initSocket()
* @throws SteamCondenserException if an host name cannot be resolved
*/
public function __construct($address, $port = null) {
$address = strval($address);
if(strpos($address, ':') !== false) {
$address = explode(':', $address, 2);
$port = $address[1];
$address = $address[0];
}
$this->ipAddresses = array();
$this->ipIndex = 0;
$this->port = intval($port);
$addresses = gethostbynamel($address);
if(empty($addresses)) {
throw new SteamCondenserException("Cannot resolve $address");
}
foreach($addresses as $address) {
$this->ipAddresses[] = $address;
}
$this->ipAddress = $this->ipAddresses[0];
$this->initSocket();
}
/**
* Rotate this server's IP address to the next one in the IP list
*
* If this method returns <var>true</var>, it indicates that all IP
* addresses have been used, hinting at the server(s) being unreachable. An
* appropriate action should be taken to inform the user.
*
* Servers with only one IP address will always cause this method to return
* <var>true</var> and the sockets will not be reinitialized.
*
* @return bool <var>true</var>, if the IP list reached its end. If the
* list contains only one IP address, this method will instantly
* return <var>true</var>
* @see initSocket()
*/
public function rotateIp() {
if(sizeof($this->ipAddresses) == 1) {
return true;
}
$this->ipIndex = ($this->ipIndex + 1) % sizeof($this->ipAddresses);
$this->ipAddress = $this->ipAddresses[$this->ipIndex];
$this->initSocket();
return $this->ipIndex == 0;
}
/**
* Initializes the socket(s) to communicate with the server
*
* Must be implemented in subclasses to prepare sockets for server
* communication
*/
protected abstract function initSocket();
}