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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\Command\CommandInterface;
use Predis\CommunicationException;
use Predis\Connection\CompositeConnectionInterface;
use Predis\Protocol\ProtocolException;
use Predis\Protocol\ProtocolProcessorInterface;
use Predis\Response\Error as ErrorResponse;
use Predis\Response\Iterator\MultiBulk as MultiBulkIterator;
use Predis\Response\Status as StatusResponse;
/**
* Protocol processor for the standard Redis wire protocol.
*
* @link http://redis.io/topics/protocol
*
* @author Daniele Alessandri <suppakilla@gmail.com>
*/
class ProtocolProcessor implements ProtocolProcessorInterface
{
protected $mbiterable;
protected $serializer;
/**
*
*/
public function __construct()
{
$this->mbiterable = false;
$this->serializer = new RequestSerializer();
}
/**
* {@inheritdoc}
*/
public function write(CompositeConnectionInterface $connection, CommandInterface $command)
{
$request = $this->serializer->serialize($command);
$connection->writeBuffer($request);
}
/**
* {@inheritdoc}
*/
public function read(CompositeConnectionInterface $connection)
{
$chunk = $connection->readLine();
$prefix = $chunk[0];
$payload = substr($chunk, 1);
switch ($prefix) {
case '+':
return new StatusResponse($payload);
case '$':
$size = (int) $payload;
if ($size === -1) {
return;
}
return substr($connection->readBuffer($size + 2), 0, -2);
case '*':
$count = (int) $payload;
if ($count === -1) {
return;
}
if ($this->mbiterable) {
return new MultiBulkIterator($connection, $count);
}
$multibulk = array();
for ($i = 0; $i < $count; ++$i) {
$multibulk[$i] = $this->read($connection);
}
return $multibulk;
case ':':
$integer = (int) $payload;
return $integer == $payload ? $integer : $payload;
case '-':
return new ErrorResponse($payload);
default:
CommunicationException::handle(new ProtocolException(
$connection, "Unknown response prefix: '$prefix'."
));
return;
}
}
/**
* Enables or disables returning multibulk responses as specialized PHP
* iterators used to stream bulk elements of a multibulk response instead
* returning a plain array.
*
* Streamable multibulk responses are not globally supported by the
* abstractions built-in into Predis, such as transactions or pipelines.
* Use them with care!
*
* @param bool $value Enable or disable streamable multibulk responses.
*/
public function useIterableMultibulk($value)
{
$this->mbiterable = (bool) $value;
}
}