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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\Pipeline;
use Exception;
use InvalidArgumentException;
use Predis\ClientContextInterface;
use Predis\ClientException;
use Predis\ClientInterface;
use Predis\Command\CommandInterface;
use Predis\Connection\ConnectionInterface;
use Predis\Connection\Replication\ReplicationInterface;
use Predis\Response\ErrorInterface as ErrorResponseInterface;
use Predis\Response\ResponseInterface;
use Predis\Response\ServerException;
use SplQueue;
/**
* Implementation of a command pipeline in which write and read operations of
* Redis commands are pipelined to alleviate the effects of network round-trips.
*
* {@inheritdoc}
*/
class Pipeline implements ClientContextInterface
{
private $client;
private $pipeline;
private $responses = [];
private $running = false;
/**
* @param ClientInterface $client Client instance used by the context.
*/
public function __construct(ClientInterface $client)
{
$this->client = $client;
$this->pipeline = new SplQueue();
}
/**
* Queues a command into the pipeline buffer.
*
* @param string $method Command ID.
* @param array $arguments Arguments for the command.
*
* @return $this
*/
public function __call($method, $arguments)
{
$command = $this->client->createCommand($method, $arguments);
$this->recordCommand($command);
return $this;
}
/**
* Queues a command instance into the pipeline buffer.
*
* @param CommandInterface $command Command to be queued in the buffer.
*/
protected function recordCommand(CommandInterface $command)
{
$this->pipeline->enqueue($command);
}
/**
* Queues a command instance into the pipeline buffer.
*
* @param CommandInterface $command Command instance to be queued in the buffer.
*
* @return $this
*/
public function executeCommand(CommandInterface $command)
{
$this->recordCommand($command);
return $this;
}
/**
* Throws an exception on -ERR responses returned by Redis.
*
* @param ConnectionInterface $connection Redis connection that returned the error.
* @param ErrorResponseInterface $response Instance of the error response.
*
* @throws ServerException
*/
protected function exception(ConnectionInterface $connection, ErrorResponseInterface $response)
{
$connection->disconnect();
$message = $response->getMessage();
throw new ServerException($message);
}
/**
* Returns the underlying connection to be used by the pipeline.
*
* @return ConnectionInterface
*/
protected function getConnection()
{
$connection = $this->getClient()->getConnection();
if ($connection instanceof ReplicationInterface) {
$connection->switchToMaster();
}
return $connection;
}
/**
* Implements the logic to flush the queued commands and read the responses
* from the current connection.
*
* @param ConnectionInterface $connection Current connection instance.
* @param SplQueue $commands Queued commands.
*
* @return array
*/
protected function executePipeline(ConnectionInterface $connection, SplQueue $commands)
{
foreach ($commands as $command) {
$connection->writeRequest($command);
}
$responses = [];
$exceptions = $this->throwServerExceptions();
while (!$commands->isEmpty()) {
$command = $commands->dequeue();
$response = $connection->readResponse($command);
if (!$response instanceof ResponseInterface) {
$responses[] = $command->parseResponse($response);
} elseif ($response instanceof ErrorResponseInterface && $exceptions) {
$this->exception($connection, $response);
} else {
$responses[] = $response;
}
}
return $responses;
}
/**
* Flushes the buffer holding all of the commands queued so far.
*
* @param bool $send Specifies if the commands in the buffer should be sent to Redis.
*
* @return $this
*/
public function flushPipeline($send = true)
{
if ($send && !$this->pipeline->isEmpty()) {
$responses = $this->executePipeline($this->getConnection(), $this->pipeline);
$this->responses = array_merge($this->responses, $responses);
} else {
$this->pipeline = new SplQueue();
}
return $this;
}
/**
* Marks the running status of the pipeline.
*
* @param bool $bool Sets the running status of the pipeline.
*
* @throws ClientException
*/
private function setRunning($bool)
{
if ($bool && $this->running) {
throw new ClientException('The current pipeline context is already being executed.');
}
$this->running = $bool;
}
/**
* Handles the actual execution of the whole pipeline.
*
* @param mixed $callable Optional callback for execution.
*
* @return array
* @throws Exception
* @throws InvalidArgumentException
*/
public function execute($callable = null)
{
if ($callable && !is_callable($callable)) {
throw new InvalidArgumentException('The argument must be a callable object.');
}
$exception = null;
$this->setRunning(true);
try {
if ($callable) {
call_user_func($callable, $this);
}
$this->flushPipeline();
} catch (Exception $exception) {
// NOOP
}
$this->setRunning(false);
if ($exception) {
throw $exception;
}
return $this->responses;
}
/**
* Returns if the pipeline should throw exceptions on server errors.
*
* @return bool
*/
protected function throwServerExceptions()
{
return (bool) $this->client->getOptions()->exceptions;
}
/**
* Returns the underlying client instance used by the pipeline object.
*
* @return ClientInterface
*/
public function getClient()
{
return $this->client;
}
}
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