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|
<?php
namespace Pheanstalk;
use Pheanstalk\Socket\NativeSocket;
/**
* A connection to a beanstalkd server
*
* @author Paul Annesley
* @package Pheanstalk
* @license http://www.opensource.org/licenses/mit-license.php
*/
class Connection
{
const CRLF = "\r\n";
const CRLF_LENGTH = 2;
const DEFAULT_CONNECT_TIMEOUT = 2;
// responses which are global errors, mapped to their exception short-names
private static $_errorResponses = array(
Response::RESPONSE_OUT_OF_MEMORY => 'OutOfMemory',
Response::RESPONSE_INTERNAL_ERROR => 'InternalError',
Response::RESPONSE_DRAINING => 'Draining',
Response::RESPONSE_BAD_FORMAT => 'BadFormat',
Response::RESPONSE_UNKNOWN_COMMAND => 'UnknownCommand',
);
// responses which are followed by data
private static $_dataResponses = array(
Response::RESPONSE_RESERVED,
Response::RESPONSE_FOUND,
Response::RESPONSE_OK,
);
private $_socket;
private $_hostname;
private $_port;
private $_connectTimeout;
private $_connectPersistent;
/**
* @param string $hostname
* @param int $port
* @param float $connectTimeout
* @param bool $connectPersistent
*/
public function __construct($hostname, $port, $connectTimeout = null, $connectPersistent = false)
{
if (is_null($connectTimeout) || !is_numeric($connectTimeout)) {
$connectTimeout = self::DEFAULT_CONNECT_TIMEOUT;
}
$this->_hostname = $hostname;
$this->_port = $port;
$this->_connectTimeout = $connectTimeout;
$this->_connectPersistent = $connectPersistent;
}
/**
* Sets a manually created socket, used for unit testing.
*
* @param Socket $socket
* @return $this
*/
public function setSocket(Socket $socket)
{
$this->_socket = $socket;
return $this;
}
/**
* @return bool
*/
public function hasSocket()
{
return isset($this->_socket);
}
/**
* Disconnect the socket.
* Subsequent socket operations will create a new connection.
*/
public function disconnect()
{
$this->_getSocket()->disconnect();
$this->_socket = null;
}
/**
* @param object $command Command
* @return object Response
* @throws Exception\ClientException
*/
public function dispatchCommand($command)
{
$socket = $this->_getSocket();
$to_send = $command->getCommandLine().self::CRLF;
if ($command->hasData()) {
$to_send .= $command->getData().self::CRLF;
}
$socket->write($to_send);
$responseLine = $socket->getLine();
$responseName = preg_replace('#^(\S+).*$#s', '$1', $responseLine);
if (isset(self::$_errorResponses[$responseName])) {
$exception = sprintf(
'\Pheanstalk\Exception\Server%sException',
self::$_errorResponses[$responseName]
);
throw new $exception(sprintf(
"%s in response to '%s'",
$responseName,
$command
));
}
if (in_array($responseName, self::$_dataResponses)) {
$dataLength = preg_replace('#^.*\b(\d+)$#', '$1', $responseLine);
$data = $socket->read($dataLength);
$crlf = $socket->read(self::CRLF_LENGTH);
if ($crlf !== self::CRLF) {
throw new Exception\ClientException(sprintf(
'Expected %u bytes of CRLF after %u bytes of data',
self::CRLF_LENGTH,
$dataLength
));
}
} else {
$data = null;
}
return $command
->getResponseParser()
->parseResponse($responseLine, $data);
}
/**
* Returns the connect timeout for this connection.
*
* @return float
*/
public function getConnectTimeout()
{
return $this->_connectTimeout;
}
/**
* Returns the host for this connection.
*
* @return string
*/
public function getHost()
{
return $this->_hostname;
}
/**
* Returns the port for this connection.
*
* @return int
*/
public function getPort()
{
return $this->_port;
}
// ----------------------------------------
/**
* Socket handle for the connection to beanstalkd
*
* @return Socket
* @throws Exception\ConnectionException
*/
private function _getSocket()
{
if (!isset($this->_socket)) {
$this->_socket = new NativeSocket(
$this->_hostname,
$this->_port,
$this->_connectTimeout,
$this->_connectPersistent
);
}
return $this->_socket;
}
/**
* Checks connection to the beanstalkd socket
*
* @return true|false
*/
public function isServiceListening()
{
try {
$this->_getSocket();
return true;
} catch (Exception\ConnectionException $e) {
return false;
}
}
}
|
