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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
namespace Wikimedia\ObjectCache;
use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerInterface;
use Redis;
use RedisException;
/**
* Wrapper class for Redis connections that automatically reuses connections (via RAII pattern)
*
* This class proxies a Redis class instance from the php-redis PECL extension.
* All its methods can be called the same way.
*
* @see <https://github.com/phpredis/phpredis#table-of-contents>
*
* @ingroup Cache
* @since 1.21
*/
class RedisConnRef implements LoggerAwareInterface {
/** @var RedisConnectionPool */
protected $pool;
/** @var Redis */
protected $conn;
/** @var string */
protected $server;
/** @var string|null */
protected $lastError;
/**
* @var LoggerInterface
*/
protected $logger;
/**
* No authentication errors.
*/
private const AUTH_NO_ERROR = 200;
/**
* Temporary authentication error; recovered by reauthenticating.
*/
private const AUTH_ERROR_TEMPORARY = 201;
/**
* Authentication error was permanent and could not be recovered.
*/
private const AUTH_ERROR_PERMANENT = 202;
/**
* @param RedisConnectionPool $pool
* @param string $server
* @param Redis $conn
* @param LoggerInterface $logger
*/
public function __construct(
RedisConnectionPool $pool, $server, Redis $conn, LoggerInterface $logger
) {
$this->pool = $pool;
$this->server = $server;
$this->conn = $conn;
$this->logger = $logger;
}
public function setLogger( LoggerInterface $logger ): void {
$this->logger = $logger;
}
/**
* @return string
* @since 1.23
*/
public function getServer() {
return $this->server;
}
public function getLastError() {
return $this->lastError;
}
public function clearLastError() {
$this->lastError = null;
}
/**
* Magic __call handler for most Redis functions.
*
* @param string $name
* @param array $arguments
* @return mixed
* @throws RedisException
*/
public function __call( $name, $arguments ) {
// Work around https://github.com/nicolasff/phpredis/issues/70
$lname = strtolower( $name );
if (
( $lname === 'blpop' || $lname === 'brpop' || $lname === 'brpoplpush' )
&& count( $arguments ) > 1
) {
// Get timeout off the end since it is always required and argument length can vary
$timeout = end( $arguments );
// Only give the additional one second buffer if not requesting an infinite timeout
$this->pool->resetTimeout( $this->conn, ( $timeout > 0 ? $timeout + 1 : $timeout ) );
}
return $this->tryCall( $name, $arguments );
}
/**
* Do the method call in the common try catch handler.
*
* @param string $method
* @param array $arguments
* @return mixed
* @throws RedisException
*/
private function tryCall( $method, $arguments ) {
$this->conn->clearLastError();
try {
$res = $this->conn->$method( ...$arguments );
$authError = $this->checkAuthentication();
if ( $authError === self::AUTH_ERROR_TEMPORARY ) {
$res = $this->conn->$method( ...$arguments );
}
if ( $authError === self::AUTH_ERROR_PERMANENT ) {
throw new RedisException( "Failure reauthenticating to Redis." );
}
return $res;
} finally {
$this->postCallCleanup();
}
}
/**
* Key Scan
* Handle this explicitly due to needing the iterator passed by reference.
* See: https://github.com/phpredis/phpredis#scan
*
* @param int &$iterator
* @param string|null $pattern
* @param int|null $count
* @return array
*/
public function scan( &$iterator, $pattern = null, $count = null ) {
return $this->tryCall( 'scan', [ &$iterator, $pattern, $count ] );
}
/**
* Set Scan
* Handle this explicitly due to needing the iterator passed by reference.
* See: https://github.com/phpredis/phpredis#sScan
*
* @param string $key
* @param int &$iterator
* @param string|null $pattern
* @param int|null $count
* @return array
*/
public function sScan( $key, &$iterator, $pattern = null, $count = null ) {
return $this->tryCall( 'sScan', [ $key, &$iterator, $pattern, $count ] );
}
/**
* Hash Scan
* Handle this explicitly due to needing the iterator passed by reference.
* See: https://github.com/phpredis/phpredis#hScan
*
* @param string $key
* @param int &$iterator
* @param string|null $pattern
* @param int|null $count
* @return array
*/
public function hScan( $key, &$iterator, $pattern = null, $count = null ) {
return $this->tryCall( 'hScan', [ $key, &$iterator, $pattern, $count ] );
}
/**
* Sorted Set Scan
* Handle this explicitly due to needing the iterator passed by reference.
* See: https://github.com/phpredis/phpredis#hScan
*
* @param string $key
* @param int &$iterator
* @param string|null $pattern
* @param int|null $count
* @return array
*/
public function zScan( $key, &$iterator, $pattern = null, $count = null ) {
return $this->tryCall( 'zScan', [ $key, &$iterator, $pattern, $count ] );
}
/**
* Handle authentication errors and automatically reauthenticate.
*
* @return int self::AUTH_NO_ERROR, self::AUTH_ERROR_TEMPORARY, or self::AUTH_ERROR_PERMANENT
*/
private function checkAuthentication() {
$lastError = $this->conn->getLastError();
if ( $lastError && preg_match( '/^ERR operation not permitted\b/', $lastError ) ) {
if ( !$this->pool->reauthenticateConnection( $this->server, $this->conn ) ) {
return self::AUTH_ERROR_PERMANENT;
}
$this->conn->clearLastError();
$this->logger->info(
"Used automatic re-authentication for Redis.",
[ 'redis_server' => $this->server ]
);
return self::AUTH_ERROR_TEMPORARY;
}
return self::AUTH_NO_ERROR;
}
/**
* Post Redis call cleanup.
*
* @return void
*/
private function postCallCleanup() {
$this->lastError = $this->conn->getLastError() ?: $this->lastError;
// Restore original timeout in the case of blocking calls.
$this->pool->resetTimeout( $this->conn );
}
/**
* @param string $script
* @param array $params
* @param int $numKeys
* @return mixed
* @throws RedisException
*/
public function luaEval( $script, array $params, $numKeys ) {
$sha1 = sha1( $script ); // 40 char hex
$conn = $this->conn; // convenience
$server = $this->server; // convenience
// Try to run the server-side cached copy of the script
$conn->clearLastError();
$res = $conn->evalSha( $sha1, $params, $numKeys );
// If we got a permission error reply that means that (a) we are not in
// multi()/pipeline() and (b) some connection problem likely occurred. If
// the password the client gave was just wrong, an exception should have
// been thrown back in getConnection() previously.
$lastError = $conn->getLastError();
if ( $lastError && preg_match( '/^ERR operation not permitted\b/', $lastError ) ) {
$this->pool->reauthenticateConnection( $server, $conn );
$conn->clearLastError();
$res = $conn->eval( $script, $params, $numKeys );
$this->logger->info(
"Used automatic re-authentication for Lua script '$sha1'.",
[ 'redis_server' => $server ]
);
}
// If the script is not in cache, use eval() to retry and cache it
$lastError = $conn->getLastError();
if ( $lastError && preg_match( '/^NOSCRIPT/', $lastError ) ) {
$conn->clearLastError();
$res = $conn->eval( $script, $params, $numKeys );
$this->logger->info(
"Used eval() for Lua script '$sha1'.",
[ 'redis_server' => $server ]
);
}
$lastError = $conn->getLastError();
if ( $lastError ) { // script bug?
$this->logger->error(
'Lua script error on server "{redis_server}": {lua_error}',
[
'redis_server' => $server,
'lua_error' => $lastError
]
);
$this->lastError = $lastError;
}
return $res;
}
/**
* @param Redis $conn
* @return bool
*/
public function isConnIdentical( Redis $conn ) {
return $this->conn === $conn;
}
public function __destruct() {
$this->pool->freeConnection( $this->server, $this->conn );
}
}
/** @deprecated class alias since 1.43 */
class_alias( RedisConnRef::class, 'RedisConnRef' );