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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\Transaction;
use Exception;
use InvalidArgumentException;
use Predis\ClientContextInterface;
use Predis\ClientException;
use Predis\ClientInterface;
use Predis\Command\CommandInterface;
use Predis\CommunicationException;
use Predis\Connection\Cluster\ClusterInterface;
use Predis\NotSupportedException;
use Predis\Protocol\ProtocolException;
use Predis\Response\ErrorInterface as ErrorResponseInterface;
use Predis\Response\ServerException;
use Predis\Response\Status as StatusResponse;
use SplQueue;
/**
* Client-side abstraction of a Redis transaction based on MULTI / EXEC.
*
* {@inheritdoc}
*/
class MultiExec implements ClientContextInterface
{
private $state;
protected $client;
protected $commands;
protected $exceptions = true;
protected $attempts = 0;
protected $watchKeys = [];
protected $modeCAS = false;
/**
* @param ClientInterface $client Client instance used by the transaction.
* @param array $options Initialization options.
*/
public function __construct(ClientInterface $client, array $options = null)
{
$this->assertClient($client);
$this->client = $client;
$this->state = new MultiExecState();
$this->configure($client, $options ?: []);
$this->reset();
}
/**
* Checks if the passed client instance satisfies the required conditions
* needed to initialize the transaction object.
*
* @param ClientInterface $client Client instance used by the transaction object.
*
* @throws NotSupportedException
*/
private function assertClient(ClientInterface $client)
{
if ($client->getConnection() instanceof ClusterInterface) {
throw new NotSupportedException(
'Cannot initialize a MULTI/EXEC transaction over cluster connections.'
);
}
if (!$client->getCommandFactory()->supports('MULTI', 'EXEC', 'DISCARD')) {
throw new NotSupportedException(
'MULTI, EXEC and DISCARD are not supported by the current command factory.'
);
}
}
/**
* Configures the transaction using the provided options.
*
* @param ClientInterface $client Underlying client instance.
* @param array $options Array of options for the transaction.
**/
protected function configure(ClientInterface $client, array $options)
{
if (isset($options['exceptions'])) {
$this->exceptions = (bool) $options['exceptions'];
} else {
$this->exceptions = $client->getOptions()->exceptions;
}
if (isset($options['cas'])) {
$this->modeCAS = (bool) $options['cas'];
}
if (isset($options['watch']) && $keys = $options['watch']) {
$this->watchKeys = $keys;
}
if (isset($options['retry'])) {
$this->attempts = (int) $options['retry'];
}
}
/**
* Resets the state of the transaction.
*/
protected function reset()
{
$this->state->reset();
$this->commands = new SplQueue();
}
/**
* Initializes the transaction context.
*/
protected function initialize()
{
if ($this->state->isInitialized()) {
return;
}
if ($this->modeCAS) {
$this->state->flag(MultiExecState::CAS);
}
if ($this->watchKeys) {
$this->watch($this->watchKeys);
}
$cas = $this->state->isCAS();
$discarded = $this->state->isDiscarded();
if (!$cas || ($cas && $discarded)) {
$this->call('MULTI');
if ($discarded) {
$this->state->unflag(MultiExecState::CAS);
}
}
$this->state->unflag(MultiExecState::DISCARDED);
$this->state->flag(MultiExecState::INITIALIZED);
}
/**
* Dynamically invokes a Redis command with the specified arguments.
*
* @param string $method Command ID.
* @param array $arguments Arguments for the command.
*
* @return mixed
*/
public function __call($method, $arguments)
{
return $this->executeCommand(
$this->client->createCommand($method, $arguments)
);
}
/**
* Executes a Redis command bypassing the transaction logic.
*
* @param string $commandID Command ID.
* @param array $arguments Arguments for the command.
*
* @return mixed
* @throws ServerException
*/
protected function call($commandID, array $arguments = [])
{
$response = $this->client->executeCommand(
$this->client->createCommand($commandID, $arguments)
);
if ($response instanceof ErrorResponseInterface) {
throw new ServerException($response->getMessage());
}
return $response;
}
/**
* Executes the specified Redis command.
*
* @param CommandInterface $command Command instance.
*
* @return $this|mixed
* @throws AbortedMultiExecException
* @throws CommunicationException
*/
public function executeCommand(CommandInterface $command)
{
$this->initialize();
if ($this->state->isCAS()) {
return $this->client->executeCommand($command);
}
$response = $this->client->getConnection()->executeCommand($command);
if ($response instanceof StatusResponse && $response == 'QUEUED') {
$this->commands->enqueue($command);
} elseif ($response instanceof ErrorResponseInterface) {
throw new AbortedMultiExecException($this, $response->getMessage());
} else {
$this->onProtocolError('The server did not return a +QUEUED status response.');
}
return $this;
}
/**
* Executes WATCH against one or more keys.
*
* @param string|array $keys One or more keys.
*
* @return mixed
* @throws NotSupportedException
* @throws ClientException
*/
public function watch($keys)
{
if (!$this->client->getCommandFactory()->supports('WATCH')) {
throw new NotSupportedException('WATCH is not supported by the current command factory.');
}
if ($this->state->isWatchAllowed()) {
throw new ClientException('Sending WATCH after MULTI is not allowed.');
}
$response = $this->call('WATCH', is_array($keys) ? $keys : [$keys]);
$this->state->flag(MultiExecState::WATCH);
return $response;
}
/**
* Finalizes the transaction by executing MULTI on the server.
*
* @return MultiExec
*/
public function multi()
{
if ($this->state->check(MultiExecState::INITIALIZED | MultiExecState::CAS)) {
$this->state->unflag(MultiExecState::CAS);
$this->call('MULTI');
} else {
$this->initialize();
}
return $this;
}
/**
* Executes UNWATCH.
*
* @return MultiExec
* @throws NotSupportedException
*/
public function unwatch()
{
if (!$this->client->getCommandFactory()->supports('UNWATCH')) {
throw new NotSupportedException(
'UNWATCH is not supported by the current command factory.'
);
}
$this->state->unflag(MultiExecState::WATCH);
$this->__call('UNWATCH', []);
return $this;
}
/**
* Resets the transaction by UNWATCH-ing the keys that are being WATCHed and
* DISCARD-ing pending commands that have been already sent to the server.
*
* @return MultiExec
*/
public function discard()
{
if ($this->state->isInitialized()) {
$this->call($this->state->isCAS() ? 'UNWATCH' : 'DISCARD');
$this->reset();
$this->state->flag(MultiExecState::DISCARDED);
}
return $this;
}
/**
* Executes the whole transaction.
*
* @return mixed
*/
public function exec()
{
return $this->execute();
}
/**
* Checks the state of the transaction before execution.
*
* @param mixed $callable Callback for execution.
*
* @throws InvalidArgumentException
* @throws ClientException
*/
private function checkBeforeExecution($callable)
{
if ($this->state->isExecuting()) {
throw new ClientException(
'Cannot invoke "execute" or "exec" inside an active transaction context.'
);
}
if ($callable) {
if (!is_callable($callable)) {
throw new InvalidArgumentException('The argument must be a callable object.');
}
if (!$this->commands->isEmpty()) {
$this->discard();
throw new ClientException(
'Cannot execute a transaction block after using fluent interface.'
);
}
} elseif ($this->attempts) {
$this->discard();
throw new ClientException(
'Automatic retries are supported only when a callable block is provided.'
);
}
}
/**
* Handles the actual execution of the whole transaction.
*
* @param mixed $callable Optional callback for execution.
*
* @return array
* @throws CommunicationException
* @throws AbortedMultiExecException
* @throws ServerException
*/
public function execute($callable = null)
{
$this->checkBeforeExecution($callable);
$execResponse = null;
$attempts = $this->attempts;
do {
if ($callable) {
$this->executeTransactionBlock($callable);
}
if ($this->commands->isEmpty()) {
if ($this->state->isWatching()) {
$this->discard();
}
return;
}
$execResponse = $this->call('EXEC');
if ($execResponse === null) {
if ($attempts === 0) {
throw new AbortedMultiExecException(
$this, 'The current transaction has been aborted by the server.'
);
}
$this->reset();
continue;
}
break;
} while ($attempts-- > 0);
$response = [];
$commands = $this->commands;
$size = count($execResponse);
if ($size !== count($commands)) {
$this->onProtocolError('EXEC returned an unexpected number of response items.');
}
for ($i = 0; $i < $size; ++$i) {
$cmdResponse = $execResponse[$i];
if ($cmdResponse instanceof ErrorResponseInterface && $this->exceptions) {
throw new ServerException($cmdResponse->getMessage());
}
$response[$i] = $commands->dequeue()->parseResponse($cmdResponse);
}
return $response;
}
/**
* Passes the current transaction object to a callable block for execution.
*
* @param mixed $callable Callback.
*
* @throws CommunicationException
* @throws ServerException
*/
protected function executeTransactionBlock($callable)
{
$exception = null;
$this->state->flag(MultiExecState::INSIDEBLOCK);
try {
call_user_func($callable, $this);
} catch (CommunicationException $exception) {
// NOOP
} catch (ServerException $exception) {
// NOOP
} catch (Exception $exception) {
$this->discard();
}
$this->state->unflag(MultiExecState::INSIDEBLOCK);
if ($exception) {
throw $exception;
}
}
/**
* Helper method for protocol errors encountered inside the transaction.
*
* @param string $message Error message.
*/
private function onProtocolError($message)
{
// Since a MULTI/EXEC block cannot be initialized when using aggregate
// connections we can safely assume that Predis\Client::getConnection()
// will return a Predis\Connection\NodeConnectionInterface instance.
CommunicationException::handle(new ProtocolException(
$this->client->getConnection(), $message
));
}
}
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