File "RelayConnection.php"
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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\Connection;
use InvalidArgumentException;
use Predis\ClientException;
use Predis\Command\CommandInterface;
use Predis\NotSupportedException;
use Predis\Response\ServerException;
use Relay\Exception as RelayException;
use Relay\Relay;
/**
* This class provides the implementation of a Predis connection that
* uses Relay for network communication and in-memory caching.
*
* Using Relay allows for:
* 1) significantly faster reads thanks to in-memory caching
* 2) fast data serialization using igbinary
* 3) fast data compression using lzf, lz4 or zstd
*
* Usage of igbinary serialization and zstd compresses reduces
* network traffic and Redis memory usage by ~75%.
*
* For instructions on how to install the Relay extension, please consult
* the repository of the project: https://relay.so/docs/installation
*
* The connection parameters supported by this class are:
*
* - scheme: it can be either 'tcp', 'tls' or 'unix'.
* - host: hostname or IP address of the server.
* - port: TCP port of the server.
* - path: path of a UNIX domain socket when scheme is 'unix'.
* - timeout: timeout to perform the connection.
* - read_write_timeout: timeout of read / write operations.
* - cache: whether to use in-memory caching
* - serializer: data serializer
* - compression: data compression algorithm
*
* @see https://github.com/cachewerk/relay
*/
class RelayConnection extends StreamConnection
{
use RelayMethods;
/**
* The Relay instance.
*
* @var \Relay\Relay
*/
protected $client;
/**
* These commands must be called on the client, not using `Relay::rawCommand()`.
*
* @var string[]
*/
public $atypicalCommands = [
'AUTH',
'SELECT',
'TYPE',
'MULTI',
'EXEC',
'DISCARD',
'WATCH',
'UNWATCH',
'SUBSCRIBE',
'UNSUBSCRIBE',
'PSUBSCRIBE',
'PUNSUBSCRIBE',
'SSUBSCRIBE',
'SUNSUBSCRIBE',
];
/**
* {@inheritdoc}
*/
public function __construct(ParametersInterface $parameters)
{
$this->assertExtensions();
$this->parameters = $this->assertParameters($parameters);
$this->client = $this->createClient();
}
/**
* {@inheritdoc}
*/
public function isConnected()
{
return $this->client->isConnected();
}
/**
* {@inheritdoc}
*/
public function disconnect()
{
if ($this->client->isConnected()) {
$this->client->close();
}
}
/**
* Checks if the Relay extension is loaded in PHP.
*/
private function assertExtensions()
{
if (!extension_loaded('relay')) {
throw new NotSupportedException(
'The "relay" extension is required by this connection backend.'
);
}
}
/**
* {@inheritdoc}
*/
protected function assertParameters(ParametersInterface $parameters)
{
if (!in_array($parameters->scheme, ['tcp', 'tls', 'unix', 'redis', 'rediss'])) {
throw new InvalidArgumentException("Invalid scheme: '{$parameters->scheme}'.");
}
if (!in_array($parameters->serializer, [null, 'php', 'igbinary', 'msgpack', 'json'])) {
throw new InvalidArgumentException("Invalid serializer: '{$parameters->serializer}'.");
}
if (!in_array($parameters->compression, [null, 'lzf', 'lz4', 'zstd'])) {
throw new InvalidArgumentException("Invalid compression algorithm: '{$parameters->compression}'.");
}
return $parameters;
}
/**
* Creates a new instance of the client.
*
* @return \Relay\Relay
*/
private function createClient()
{
$client = new Relay();
// throw when errors occur and return `null` for non-existent keys
$client->setOption(Relay::OPT_PHPREDIS_COMPATIBILITY, false);
// use reply literals
$client->setOption(Relay::OPT_REPLY_LITERAL, true);
// disable Relay's command/connection retry
$client->setOption(Relay::OPT_MAX_RETRIES, 0);
// whether to use in-memory caching
$client->setOption(Relay::OPT_USE_CACHE, $this->parameters->cache ?? true);
// set data serializer
$client->setOption(Relay::OPT_SERIALIZER, constant(sprintf(
'%s::SERIALIZER_%s',
Relay::class,
strtoupper($this->parameters->serializer ?? 'none')
)));
// set data compression algorithm
$client->setOption(Relay::OPT_COMPRESSION, constant(sprintf(
'%s::COMPRESSION_%s',
Relay::class,
strtoupper($this->parameters->compression ?? 'none')
)));
return $client;
}
/**
* Returns the underlying client.
*
* @return \Relay\Relay
*/
public function getClient()
{
return $this->client;
}
/**
* {@inheritdoc}
*/
protected function getIdentifier()
{
return $this->client->endpointId();
}
/**
* {@inheritdoc}
*/
protected function createStreamSocket(ParametersInterface $parameters, $address, $flags)
{
$timeout = isset($parameters->timeout) ? (float) $parameters->timeout : 5.0;
$retry_interval = 0;
$read_timeout = 5.0;
if (isset($parameters->read_write_timeout)) {
$read_timeout = (float) $parameters->read_write_timeout;
$read_timeout = $read_timeout > 0 ? $read_timeout : 0;
}
try {
$this->client->connect(
$parameters->path ?? $parameters->host,
isset($parameters->path) ? 0 : $parameters->port,
$timeout,
null,
$retry_interval,
$read_timeout
);
} catch (RelayException $ex) {
$this->onConnectionError($ex->getMessage(), $ex->getCode());
}
return $this->client;
}
/**
* {@inheritdoc}
*/
public function executeCommand(CommandInterface $command)
{
if (!$this->client->isConnected()) {
$this->getResource();
}
try {
$name = $command->getId();
// When using compression or a serializer, we'll need a dedicated
// handler for `Predis\Command\RawCommand` calls, currently both
// parameters are unsupported until a future Relay release
return in_array($name, $this->atypicalCommands)
? $this->client->{$name}(...$command->getArguments())
: $this->client->rawCommand($name, ...$command->getArguments());
} catch (RelayException $ex) {
throw $this->onCommandError($ex, $command);
}
}
/**
* {@inheritdoc}
*/
public function onCommandError(RelayException $exception, CommandInterface $command)
{
$code = $exception->getCode();
$message = $exception->getMessage();
if (strpos($message, 'RELAY_ERR_IO')) {
return new ConnectionException($this, $message, $code, $exception);
}
if (strpos($message, 'RELAY_ERR_REDIS')) {
return new ServerException($message, $code, $exception);
}
if (strpos($message, 'RELAY_ERR_WRONGTYPE') && strpos($message, "Got reply-type 'status'")) {
$message = 'Operation against a key holding the wrong kind of value';
}
return new ClientException($message, $code, $exception);
}
/**
* Applies the configured serializer and compression to given value.
*
* @param mixed $value
* @return string
*/
public function pack($value)
{
return $this->client->_pack($value);
}
/**
* Deserializes and decompresses to given value.
*
* @param mixed $value
* @return string
*/
public function unpack($value)
{
return $this->client->_unpack($value);
}
/**
* {@inheritdoc}
*/
public function writeRequest(CommandInterface $command)
{
throw new NotSupportedException('The "relay" extension does not support writing requests.');
}
/**
* {@inheritdoc}
*/
public function readResponse(CommandInterface $command)
{
throw new NotSupportedException('The "relay" extension does not support reading responses.');
}
/**
* {@inheritdoc}
*/
public function __destruct()
{
$this->disconnect();
}
/**
* {@inheritdoc}
*/
public function __wakeup()
{
$this->assertExtensions();
$this->client = $this->createClient();
}
}