RedisBackend.php

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<?php
 
/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */
 
namespace ‪TYPO3\CMS\Core\Cache\Backend;
 
use ‪TYPO3\CMS\Core\Cache\Exception;
use ‪TYPO3\CMS\Core\Cache\Exception\InvalidDataException;
use ‪TYPO3\CMS\Core\Utility\StringUtility;
 
class ‪RedisBackend extends ‪AbstractBackend implements ‪TaggableBackendInterface
{
    const ‪FAKED_UNLIMITED_LIFETIME = 31536000;
    const ‪IDENTIFIER_DATA_PREFIX = 'identData:';
    const ‪IDENTIFIER_TAGS_PREFIX = 'identTags:';
    const ‪TAG_IDENTIFIERS_PREFIX = 'tagIdents:';
    protected ‪$redis;
 
    protected ‪$connected = false;
 
    protected ‪$persistentConnection = false;
 
    protected ‪$hostname = '127.0.0.1';
 
    protected ‪$port = 6379;
 
    protected ‪$database = 0;
 
    protected ‪$password = '';
 
    protected ‪$compression = false;
 
    protected ‪$compressionLevel = -1;
 
    protected ‪$connectionTimeout = 0;
 
    public function ‪__construct(‪$context, array $options = [])
    {
        if (!extension_loaded('redis')) {
            throw new ‪Exception('The PHP extension "redis" must be installed and loaded in order to use the redis backend.', 1279462933);
        }
        parent::__construct(‪$context, $options);
    }
 
    public function ‪initializeObject()
    {
        $this->redis = new \Redis();
        try {
            if ($this->persistentConnection) {
                $this->connected = $this->redis->pconnect($this->hostname, $this->port, $this->connectionTimeout, (string)$this->database);
            } else {
                $this->connected = $this->redis->connect($this->hostname, $this->port, $this->connectionTimeout);
            }
        } catch (\Exception $e) {
            $this->logger->alert('Could not connect to redis server.', ['exception' => $e]);
        }
        if ($this->connected) {
            if ($this->password !== '') {
                $success = $this->redis->auth($this->password);
                if (!$success) {
                    throw new Exception('The given password was not accepted by the redis server.', 1279765134);
                }
            }
            if ($this->database >= 0) {
                $success = $this->redis->select($this->database);
                if (!$success) {
                    throw new Exception('The given database "' . $this->database . '" could not be selected.', 1279765144);
                }
            }
        }
    }
 
    public function ‪setPersistentConnection(‪$persistentConnection)
    {
        $this->persistentConnection = ‪$persistentConnection;
    }
 
    public function ‪setHostname(‪$hostname)
    {
        $this->hostname = ‪$hostname;
    }
 
    public function ‪setPort(‪$port)
    {
        $this->port = ‪$port;
    }
 
    public function ‪setDatabase(‪$database)
    {
        if (!is_int(‪$database)) {
            throw new \InvalidArgumentException('The specified database number is of type "' . gettype(‪$database) . '" but an integer is expected.', 1279763057);
        }
        if (‪$database < 0) {
            throw new \InvalidArgumentException('The specified database "' . ‪$database . '" must be greater or equal than zero.', 1279763534);
        }
        $this->database = ‪$database;
    }
 
    public function ‪setPassword(‪$password)
    {
        $this->password = ‪$password;
    }
 
    public function ‪setCompression(‪$compression)
    {
        if (!is_bool(‪$compression)) {
            throw new \InvalidArgumentException('The specified compression of type "' . gettype(‪$compression) . '" but a boolean is expected.', 1289679153);
        }
        $this->compression = ‪$compression;
    }
 
    public function ‪setCompressionLevel(‪$compressionLevel)
    {
        if (!is_int(‪$compressionLevel)) {
            throw new \InvalidArgumentException('The specified compression of type "' . gettype(‪$compressionLevel) . '" but an integer is expected.', 1289679154);
        }
        if (‪$compressionLevel >= -1 && ‪$compressionLevel <= 9) {
            $this->compressionLevel = ‪$compressionLevel;
        } else {
            throw new \InvalidArgumentException('The specified compression level must be an integer between -1 and 9.', 1289679155);
        }
    }
 
    public function ‪setConnectionTimeout(‪$connectionTimeout)
    {
        if (!is_int(‪$connectionTimeout)) {
            throw new \InvalidArgumentException('The specified connection timeout is of type "' . gettype(‪$connectionTimeout) . '" but an integer is expected.', 1487849315);
        }
 
        if (‪$connectionTimeout < 0) {
            throw new \InvalidArgumentException('The specified connection timeout "' . ‪$connectionTimeout . '" must be greater or equal than zero.', 1487849326);
        }
 
        $this->connectionTimeout = ‪$connectionTimeout;
    }
 
    public function set($entryIdentifier, $data, array $tags = [], $lifetime = null)
    {
        if (!$this->‪canBeUsedInStringContext($entryIdentifier)) {
            throw new \InvalidArgumentException('The specified identifier is of type "' . gettype($entryIdentifier) . '" which can\'t be converted to string.', 1377006651);
        }
        if (!is_string($data)) {
            throw new InvalidDataException('The specified data is of type "' . gettype($data) . '" but a string is expected.', 1279469941);
        }
        $lifetime = $lifetime ?? ‪$this->defaultLifetime;
        if (!is_int($lifetime)) {
            throw new \InvalidArgumentException('The specified lifetime is of type "' . gettype($lifetime) . '" but an integer or NULL is expected.', 1279488008);
        }
        if ($lifetime < 0) {
            throw new \InvalidArgumentException('The specified lifetime "' . $lifetime . '" must be greater or equal than zero.', 1279487573);
        }
        if ($this->connected) {
            $expiration = $lifetime === 0 ? ‪self::FAKED_UNLIMITED_LIFETIME : $lifetime;
            if ($this->compression) {
                $data = gzcompress($data, $this->compressionLevel);
            }
            $this->redis->setex(self::IDENTIFIER_DATA_PREFIX . $entryIdentifier, $expiration, $data);
            $addTags = $tags;
            $removeTags = [];
            $existingTags = $this->redis->sMembers(self::IDENTIFIER_TAGS_PREFIX . $entryIdentifier);
            if (!empty($existingTags)) {
                $addTags = array_diff($tags, $existingTags);
                $removeTags = array_diff($existingTags, $tags);
            }
            if (!empty($removeTags) || !empty($addTags)) {
                $queue = $this->redis->multi(\Redis::PIPELINE);
                foreach ($removeTags as $tag) {
                    $queue->sRem(self::IDENTIFIER_TAGS_PREFIX . $entryIdentifier, $tag);
                    $queue->sRem(self::TAG_IDENTIFIERS_PREFIX . $tag, $entryIdentifier);
                }
                foreach ($addTags as $tag) {
                    $queue->sAdd(self::IDENTIFIER_TAGS_PREFIX . $entryIdentifier, $tag);
                    $queue->sAdd(self::TAG_IDENTIFIERS_PREFIX . $tag, $entryIdentifier);
                }
                $queue->exec();
            }
        }
    }
 
    public function get($entryIdentifier)
    {
        if (!$this->‪canBeUsedInStringContext($entryIdentifier)) {
            throw new \InvalidArgumentException('The specified identifier is of type "' . gettype($entryIdentifier) . '" which can\'t be converted to string.', 1377006652);
        }
        $storedEntry = false;
        if ($this->connected) {
            $storedEntry = $this->redis->get(self::IDENTIFIER_DATA_PREFIX . $entryIdentifier);
        }
        if ($this->compression && (string)$storedEntry !== '') {
            $storedEntry = gzuncompress((string)$storedEntry);
        }
        return $storedEntry;
    }
 
    public function ‪has($entryIdentifier)
    {
        if (!$this->‪canBeUsedInStringContext($entryIdentifier)) {
            throw new \InvalidArgumentException('The specified identifier is of type "' . gettype($entryIdentifier) . '" which can\'t be converted to string.', 1377006653);
        }
        return $this->connected && $this->redis->exists(self::IDENTIFIER_DATA_PREFIX . $entryIdentifier);
    }
 
    public function remove($entryIdentifier)
    {
        if (!$this->‪canBeUsedInStringContext($entryIdentifier)) {
            throw new \InvalidArgumentException('The specified identifier is of type "' . gettype($entryIdentifier) . '" which can\'t be converted to string.', 1377006654);
        }
        $elementsDeleted = false;
        if ($this->connected) {
            if ($this->redis->exists(self::IDENTIFIER_DATA_PREFIX . $entryIdentifier)) {
                $assignedTags = $this->redis->sMembers(self::IDENTIFIER_TAGS_PREFIX . $entryIdentifier);
                $queue = $this->redis->multi(\Redis::PIPELINE);
                foreach ($assignedTags as $tag) {
                    $queue->sRem(self::TAG_IDENTIFIERS_PREFIX . $tag, $entryIdentifier);
                }
                $queue->del(self::IDENTIFIER_DATA_PREFIX . $entryIdentifier, self::IDENTIFIER_TAGS_PREFIX . $entryIdentifier);
                $queue->exec();
                $elementsDeleted = true;
            }
        }
        return $elementsDeleted;
    }
 
    public function ‪findIdentifiersByTag($tag)
    {
        if (!$this->‪canBeUsedInStringContext($tag)) {
            throw new \InvalidArgumentException('The specified tag is of type "' . gettype($tag) . '" which can\'t be converted to string.', 1377006655);
        }
        $foundIdentifiers = [];
        if ($this->connected) {
            $foundIdentifiers = $this->redis->sMembers(self::TAG_IDENTIFIERS_PREFIX . $tag);
        }
        return $foundIdentifiers;
    }
 
    public function ‪flush()
    {
        if ($this->connected) {
            $this->redis->flushDB();
        }
    }
 
    public function ‪flushByTag($tag)
    {
        if (!$this->‪canBeUsedInStringContext($tag)) {
            throw new \InvalidArgumentException('The specified tag is of type "' . gettype($tag) . '" which can\'t be converted to string.', 1377006656);
        }
        if ($this->connected) {
            $identifiers = $this->redis->sMembers(self::TAG_IDENTIFIERS_PREFIX . $tag);
            if (!empty($identifiers)) {
                $this->‪removeIdentifierEntriesAndRelations($identifiers, [$tag]);
            }
        }
    }
 
    public function ‪collectGarbage()
    {
        $identifierToTagsKeys = $this->redis->keys(self::IDENTIFIER_TAGS_PREFIX . '*');
        foreach ($identifierToTagsKeys as $identifierToTagsKey) {
            [, $identifier] = explode(':', $identifierToTagsKey);
            // Check if the data entry still exists
            if (!$this->redis->exists(self::IDENTIFIER_DATA_PREFIX . $identifier)) {
                $tagsToRemoveIdentifierFrom = $this->redis->sMembers($identifierToTagsKey);
                $queue = $this->redis->multi(\Redis::PIPELINE);
                $queue->del($identifierToTagsKey);
                foreach ($tagsToRemoveIdentifierFrom as $tag) {
                    $queue->sRem(self::TAG_IDENTIFIERS_PREFIX . $tag, $identifier);
                }
                $queue->exec();
            }
        }
    }
 
    protected function ‪removeIdentifierEntriesAndRelations(array $identifiers, array $tags)
    {
        // Set a temporary entry which holds all identifiers that need to be removed from
        // the tag to identifiers sets
        $uniqueTempKey = 'temp:' . ‪StringUtility::getUniqueId();
        $prefixedKeysToDelete = [$uniqueTempKey];
        $prefixedIdentifierToTagsKeysToDelete = [];
        foreach ($identifiers as $identifier) {
            $prefixedKeysToDelete[] = self::IDENTIFIER_DATA_PREFIX . $identifier;
            $prefixedIdentifierToTagsKeysToDelete[] = self::IDENTIFIER_TAGS_PREFIX . $identifier;
        }
        foreach ($tags as $tag) {
            $prefixedKeysToDelete[] = self::TAG_IDENTIFIERS_PREFIX . $tag;
        }
        $tagToIdentifiersSetsToRemoveIdentifiersFrom = $this->redis->sUnion($prefixedIdentifierToTagsKeysToDelete);
        // Remove the tag to identifier set of the given tags, they will be removed anyway
        $tagToIdentifiersSetsToRemoveIdentifiersFrom = array_diff($tagToIdentifiersSetsToRemoveIdentifiersFrom, $tags);
        // Diff all identifiers that must be removed from tag to identifiers sets off from a
        // tag to identifiers set and store result in same tag to identifiers set again
        $queue = $this->redis->multi(\Redis::PIPELINE);
        foreach ($identifiers as $identifier) {
            $queue->sAdd($uniqueTempKey, $identifier);
        }
        foreach ($tagToIdentifiersSetsToRemoveIdentifiersFrom as $tagToIdentifiersSet) {
            $queue->sDiffStore(self::TAG_IDENTIFIERS_PREFIX . $tagToIdentifiersSet, self::TAG_IDENTIFIERS_PREFIX . $tagToIdentifiersSet, $uniqueTempKey);
        }
        $queue->del(array_merge($prefixedKeysToDelete, $prefixedIdentifierToTagsKeysToDelete));
        $queue->exec();
    }
 
    protected function ‪canBeUsedInStringContext($variable)
    {
        return is_scalar($variable) || (is_object($variable) && method_exists($variable, '__toString'));
    }
}