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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 Closure;
use InvalidArgumentException;
use Predis\Command\CommandInterface;
use Predis\NotSupportedException;
use Predis\Protocol\ProtocolException;
use Predis\Response\Error as ErrorResponse;
use Predis\Response\Status as StatusResponse;
/**
* This class implements a Predis connection that actually talks with Webdis
* instead of connecting directly to Redis. It relies on the cURL extension to
* communicate with the web server and the phpiredis extension to parse the
* protocol for responses returned in the http response bodies.
*
* Some features are not yet available or they simply cannot be implemented:
* - Pipelining commands.
* - Publish / Subscribe.
* - MULTI / EXEC transactions (not yet supported by Webdis).
*
* The connection parameters supported by this class are:
*
* - scheme: must be 'http'.
* - host: hostname or IP address of the server.
* - port: TCP port of the server.
* - timeout: timeout to perform the connection (default is 5 seconds).
* - user: username for authentication.
* - pass: password for authentication.
*
* @see http://webd.is
* @see http://github.com/nicolasff/webdis
* @see http://github.com/seppo0010/phpiredis
* @deprecated 2.1.2
*/
class WebdisConnection implements NodeConnectionInterface
{
private $parameters;
private $resource;
private $reader;
/**
* @param ParametersInterface $parameters Initialization parameters for the connection.
*
* @throws InvalidArgumentException
*/
public function __construct(ParametersInterface $parameters)
{
$this->assertExtensions();
if ($parameters->scheme !== 'http') {
throw new InvalidArgumentException("Invalid scheme: '{$parameters->scheme}'.");
}
$this->parameters = $parameters;
$this->resource = $this->createCurl();
$this->reader = $this->createReader();
}
/**
* Frees the underlying cURL and protocol reader resources when the garbage
* collector kicks in.
*/
public function __destruct()
{
curl_close($this->resource);
phpiredis_reader_destroy($this->reader);
}
/**
* Helper method used to throw on unsupported methods.
*
* @param string $method Name of the unsupported method.
*
* @throws NotSupportedException
*/
private function throwNotSupportedException($method)
{
$class = __CLASS__;
throw new NotSupportedException("The method $class::$method() is not supported.");
}
/**
* Checks if the cURL and phpiredis extensions are loaded in PHP.
*/
private function assertExtensions()
{
if (!extension_loaded('curl')) {
throw new NotSupportedException(
'The "curl" extension is required by this connection backend.'
);
}
if (!extension_loaded('phpiredis')) {
throw new NotSupportedException(
'The "phpiredis" extension is required by this connection backend.'
);
}
}
/**
* Initializes cURL.
*
* @return resource
*/
private function createCurl()
{
$parameters = $this->getParameters();
$timeout = (isset($parameters->timeout) ? (float) $parameters->timeout : 5.0) * 1000;
if (filter_var($host = $parameters->host, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
$host = "[$host]";
}
$options = [
CURLOPT_FAILONERROR => true,
CURLOPT_CONNECTTIMEOUT_MS => $timeout,
CURLOPT_URL => "$parameters->scheme://$host:$parameters->port",
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_POST => true,
CURLOPT_WRITEFUNCTION => [$this, 'feedReader'],
];
if (isset($parameters->user, $parameters->pass)) {
$options[CURLOPT_USERPWD] = "{$parameters->user}:{$parameters->pass}";
}
curl_setopt_array($resource = curl_init(), $options);
return $resource;
}
/**
* Initializes the phpiredis protocol reader.
*
* @return resource
*/
private function createReader()
{
$reader = phpiredis_reader_create();
phpiredis_reader_set_status_handler($reader, $this->getStatusHandler());
phpiredis_reader_set_error_handler($reader, $this->getErrorHandler());
return $reader;
}
/**
* Returns the handler used by the protocol reader for inline responses.
*
* @return Closure
*/
protected function getStatusHandler()
{
static $statusHandler;
if (!$statusHandler) {
$statusHandler = function ($payload) {
return StatusResponse::get($payload);
};
}
return $statusHandler;
}
/**
* Returns the handler used by the protocol reader for error responses.
*
* @return Closure
*/
protected function getErrorHandler()
{
static $errorHandler;
if (!$errorHandler) {
$errorHandler = function ($errorMessage) {
return new ErrorResponse($errorMessage);
};
}
return $errorHandler;
}
/**
* Feeds the phpredis reader resource with the data read from the network.
*
* @param resource $resource Reader resource.
* @param string $buffer Buffer of data read from a connection.
*
* @return int
*/
protected function feedReader($resource, $buffer)
{
phpiredis_reader_feed($this->reader, $buffer);
return strlen($buffer);
}
/**
* {@inheritdoc}
*/
public function connect()
{
// NOOP
}
/**
* {@inheritdoc}
*/
public function disconnect()
{
// NOOP
}
/**
* {@inheritdoc}
*/
public function isConnected()
{
return true;
}
/**
* Checks if the specified command is supported by this connection class.
*
* @param CommandInterface $command Command instance.
*
* @return string
* @throws NotSupportedException
*/
protected function getCommandId(CommandInterface $command)
{
switch ($commandID = $command->getId()) {
case 'AUTH':
case 'SELECT':
case 'MULTI':
case 'EXEC':
case 'WATCH':
case 'UNWATCH':
case 'DISCARD':
case 'MONITOR':
throw new NotSupportedException("Command '$commandID' is not allowed by Webdis.");
default:
return $commandID;
}
}
/**
* {@inheritdoc}
*/
public function writeRequest(CommandInterface $command)
{
$this->throwNotSupportedException(__FUNCTION__);
}
/**
* {@inheritdoc}
*/
public function readResponse(CommandInterface $command)
{
$this->throwNotSupportedException(__FUNCTION__);
}
/**
* {@inheritdoc}
*/
public function executeCommand(CommandInterface $command)
{
$resource = $this->resource;
$commandId = $this->getCommandId($command);
if ($arguments = $command->getArguments()) {
$arguments = implode('/', array_map('urlencode', $arguments));
$serializedCommand = "$commandId/$arguments.raw";
} else {
$serializedCommand = "$commandId.raw";
}
curl_setopt($resource, CURLOPT_POSTFIELDS, $serializedCommand);
if (curl_exec($resource) === false) {
$error = trim(curl_error($resource));
$errno = curl_errno($resource);
throw new ConnectionException($this, "$error{$this->getParameters()}]", $errno);
}
if (phpiredis_reader_get_state($this->reader) !== PHPIREDIS_READER_STATE_COMPLETE) {
throw new ProtocolException($this, phpiredis_reader_get_error($this->reader));
}
return phpiredis_reader_get_reply($this->reader);
}
/**
* {@inheritdoc}
*/
public function getResource()
{
return $this->resource;
}
/**
* {@inheritdoc}
*/
public function getParameters()
{
return $this->parameters;
}
/**
* {@inheritdoc}
*/
public function addConnectCommand(CommandInterface $command)
{
$this->throwNotSupportedException(__FUNCTION__);
}
/**
* {@inheritdoc}
*/
public function read()
{
$this->throwNotSupportedException(__FUNCTION__);
}
/**
* {@inheritdoc}
*/
public function __toString()
{
return "{$this->parameters->host}:{$this->parameters->port}";
}
/**
* {@inheritdoc}
*/
public function __sleep()
{
return ['parameters'];
}
/**
* {@inheritdoc}
*/
public function __wakeup()
{
$this->assertExtensions();
$this->resource = $this->createCurl();
$this->reader = $this->createReader();
}
}
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