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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\PubSub;
use InvalidArgumentException;
/**
* Method-dispatcher loop built around the client-side abstraction of a Redis
* PUB / SUB context.
*/
class DispatcherLoop
{
private $pubsub;
protected $callbacks;
protected $defaultCallback;
protected $subscriptionCallback;
/**
* @param Consumer $pubsub PubSub consumer instance used by the loop.
*/
public function __construct(Consumer $pubsub)
{
$this->callbacks = [];
$this->pubsub = $pubsub;
}
/**
* Checks if the passed argument is a valid callback.
*
* @param mixed $callable A callback.
*
* @throws InvalidArgumentException
*/
protected function assertCallback($callable)
{
if (!is_callable($callable)) {
throw new InvalidArgumentException('The given argument must be a callable object.');
}
}
/**
* Returns the underlying PUB / SUB context.
*
* @return Consumer
*/
public function getPubSubConsumer()
{
return $this->pubsub;
}
/**
* Sets a callback that gets invoked upon new subscriptions.
*
* @param mixed $callable A callback.
*/
public function subscriptionCallback($callable = null)
{
if (isset($callable)) {
$this->assertCallback($callable);
}
$this->subscriptionCallback = $callable;
}
/**
* Sets a callback that gets invoked when a message is received on a
* channel that does not have an associated callback.
*
* @param mixed $callable A callback.
*/
public function defaultCallback($callable = null)
{
if (isset($callable)) {
$this->assertCallback($callable);
}
$this->subscriptionCallback = $callable;
}
/**
* Binds a callback to a channel.
*
* @param string $channel Channel name.
* @param callable $callback A callback.
*/
public function attachCallback($channel, $callback)
{
$callbackName = $this->getPrefixKeys() . $channel;
$this->assertCallback($callback);
$this->callbacks[$callbackName] = $callback;
$this->pubsub->subscribe($channel);
}
/**
* Stops listening to a channel and removes the associated callback.
*
* @param string $channel Redis channel.
*/
public function detachCallback($channel)
{
$callbackName = $this->getPrefixKeys() . $channel;
if (isset($this->callbacks[$callbackName])) {
unset($this->callbacks[$callbackName]);
$this->pubsub->unsubscribe($channel);
}
}
/**
* Starts the dispatcher loop.
*/
public function run()
{
foreach ($this->pubsub as $message) {
$kind = $message->kind;
if ($kind !== Consumer::MESSAGE && $kind !== Consumer::PMESSAGE) {
if (isset($this->subscriptionCallback)) {
$callback = $this->subscriptionCallback;
call_user_func($callback, $message, $this);
}
continue;
}
if (isset($this->callbacks[$message->channel])) {
$callback = $this->callbacks[$message->channel];
call_user_func($callback, $message->payload, $this);
} elseif (isset($this->defaultCallback)) {
$callback = $this->defaultCallback;
call_user_func($callback, $message, $this);
}
}
}
/**
* Terminates the dispatcher loop.
*/
public function stop()
{
$this->pubsub->stop();
}
/**
* Return the prefix used for keys.
*
* @return string
*/
protected function getPrefixKeys()
{
$options = $this->pubsub->getClient()->getOptions();
if (isset($options->prefix)) {
return $options->prefix->getPrefix();
}
return '';
}
}
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