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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;
use Predis\ClientConfiguration;
use Predis\Command\Redis\FUNCTIONS;
/**
* Command factory for mainline Redis servers.
*
* This factory is intended to handle standard commands implemented by mainline
* Redis servers. By default it maps a command ID to a specific command handler
* class in the Predis\Command\Redis namespace but this can be overridden for
* any command ID simply by defining a new command handler class implementing
* Predis\Command\CommandInterface.
*/
class RedisFactory extends Factory
{
private const COMMANDS_NAMESPACE = "Predis\Command\Redis";
public function __construct()
{
$this->commands = [
'ECHO' => 'Predis\Command\Redis\ECHO_',
'EVAL' => 'Predis\Command\Redis\EVAL_',
'OBJECT' => 'Predis\Command\Redis\OBJECT_',
// Class name corresponds to PHP reserved word "function", added mapping to bypass restrictions
'FUNCTION' => FUNCTIONS::class,
];
}
/**
* {@inheritdoc}
*/
public function getCommandClass(string $commandID): ?string
{
$commandID = strtoupper($commandID);
if (isset($this->commands[$commandID]) || array_key_exists($commandID, $this->commands)) {
return $this->commands[$commandID];
}
$commandClass = $this->resolve($commandID);
if (null === $commandClass) {
return null;
}
$this->commands[$commandID] = $commandClass;
return $commandClass;
}
/**
* {@inheritdoc}
*/
public function undefine(string $commandID): void
{
// NOTE: we explicitly associate `NULL` to the command ID in the map
// instead of the parent's `unset()` because our subclass tries to load
// a predefined class from the Predis\Command\Redis namespace when no
// explicit mapping is defined, see RedisFactory::getCommandClass() for
// details of the implementation of this mechanism.
$this->commands[strtoupper($commandID)] = null;
}
/**
* Resolves command object from given command ID.
*
* @param string $commandID Command ID of virtual method call
* @return string|null FQDN of corresponding command object
*/
private function resolve(string $commandID): ?string
{
if (class_exists($commandClass = self::COMMANDS_NAMESPACE . '\\' . $commandID)) {
return $commandClass;
}
$commandModule = $this->resolveCommandModuleByPrefix($commandID);
if (null === $commandModule) {
return null;
}
if (class_exists($commandClass = self::COMMANDS_NAMESPACE . '\\' . $commandModule . '\\' . $commandID)) {
return $commandClass;
}
return null;
}
private function resolveCommandModuleByPrefix(string $commandID): ?string
{
foreach (ClientConfiguration::getModules() as $module) {
if (preg_match("/^{$module['commandPrefix']}/", $commandID)) {
return $module['name'];
}
}
return null;
}
}