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<?php
/*
* This file is part of the Predis package.
*
* (c) Daniele Alessandri <suppakilla@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Predis\Protocol\Text;
use Predis\CommunicationException;
use Predis\Connection\CompositeConnectionInterface;
use Predis\Protocol\ProtocolException;
use Predis\Protocol\ResponseReaderInterface;
/**
* Response reader for the standard Redis wire protocol.
*
* @link http://redis.io/topics/protocol
*
* @author Daniele Alessandri <suppakilla@gmail.com>
*/
class ResponseReader implements ResponseReaderInterface
{
protected $handlers;
/**
*
*/
public function __construct()
{
$this->handlers = $this->getDefaultHandlers();
}
/**
* Returns the default handlers for the supported type of responses.
*
* @return array
*/
protected function getDefaultHandlers()
{
return array(
'+' => new Handler\StatusResponse(),
'-' => new Handler\ErrorResponse(),
':' => new Handler\IntegerResponse(),
'$' => new Handler\BulkResponse(),
'*' => new Handler\MultiBulkResponse(),
);
}
/**
* Sets the handler for the specified prefix identifying the response type.
*
* @param string $prefix Identifier of the type of response.
* @param Handler\ResponseHandlerInterface $handler Response handler.
*/
public function setHandler($prefix, Handler\ResponseHandlerInterface $handler)
{
$this->handlers[$prefix] = $handler;
}
/**
* Returns the response handler associated to a certain type of response.
*
* @param string $prefix Identifier of the type of response.
*
* @return Handler\ResponseHandlerInterface
*/
public function getHandler($prefix)
{
if (isset($this->handlers[$prefix])) {
return $this->handlers[$prefix];
}
return;
}
/**
* {@inheritdoc}
*/
public function read(CompositeConnectionInterface $connection)
{
$header = $connection->readLine();
if ($header === '') {
$this->onProtocolError($connection, 'Unexpected empty reponse header.');
}
$prefix = $header[0];
if (!isset($this->handlers[$prefix])) {
$this->onProtocolError($connection, "Unknown response prefix: '$prefix'.");
}
$payload = $this->handlers[$prefix]->handle($connection, substr($header, 1));
return $payload;
}
/**
* Handles protocol errors generated while reading responses from a
* connection.
*
* @param CompositeConnectionInterface $connection Redis connection that generated the error.
* @param string $message Error message.
*/
protected function onProtocolError(CompositeConnectionInterface $connection, $message)
{
CommunicationException::handle(
new ProtocolException($connection, $message)
);
}
}