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<?php
/*
* This file is part of the Predis package.
*
* (c) 2009-2020 Daniele Alessandri
* (c) 2021-2023 Till Krüss
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Predis\Command;
/**
* Base class used to implement an higher level abstraction for commands based
* on Lua scripting with EVAL and EVALSHA.
*
* @see http://redis.io/commands/eval
*/
abstract class ScriptCommand extends Command
{
/**
* {@inheritdoc}
*/
public function getId()
{
return 'EVALSHA';
}
/**
* Gets the body of a Lua script.
*
* @return string
*/
abstract public function getScript();
/**
* Calculates the SHA1 hash of the body of the script.
*
* @return string SHA1 hash.
*/
public function getScriptHash()
{
return sha1($this->getScript());
}
/**
* Specifies the number of arguments that should be considered as keys.
*
* The default behaviour for the base class is to return 0 to indicate that
* all the elements of the arguments array should be considered as keys, but
* subclasses can enforce a static number of keys.
*
* @return int
*/
protected function getKeysCount()
{
return 0;
}
/**
* Returns the elements from the arguments that are identified as keys.
*
* @return array
*/
public function getKeys()
{
return array_slice($this->getArguments(), 2, $this->getKeysCount());
}
/**
* {@inheritdoc}
*/
public function setArguments(array $arguments)
{
if (($numkeys = $this->getKeysCount()) && $numkeys < 0) {
$numkeys = count($arguments) + $numkeys;
}
$arguments = array_merge([$this->getScriptHash(), (int) $numkeys], $arguments);
parent::setArguments($arguments);
}
/**
* Returns arguments for EVAL command.
*
* @return array
*/
public function getEvalArguments()
{
$arguments = $this->getArguments();
$arguments[0] = $this->getScript();
return $arguments;
}
/**
* Returns the equivalent EVAL command as a raw command instance.
*
* @return RawCommand
*/
public function getEvalCommand()
{
return new RawCommand('EVAL', $this->getEvalArguments());
}
}