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Thus if you configure redis with the right eviction policy you can be safe this tag <> cache * relationship survives eviction (cache cleanup when Redis runs out of memory). * * Redis server 2.8+ with any `volatile-*` eviction policy, OR `noeviction` if you're sure memory will NEVER fill up * * Design limitations: * - Max 4 billion cache keys per cache tag as limited by Redis Set datatype. * E.g. If you use a "all" items tag for expiry instead of clear(), that limits you to 4 billion cache items also. * * @see https://redis.io/topics/lru-cache#eviction-policies Documentation for Redis eviction policies. * @see https://redis.io/topics/data-types#sets Documentation for Redis Set datatype. * * @author Nicolas Grekas * @author André Rømcke */ class RedisTagAwareAdapter extends AbstractTagAwareAdapter { use RedisTrait; /** * On cache items without a lifetime set, we set it to 100 days. This is to make sure cache items are * preferred to be evicted over tag Sets, if eviction policy is configured according to requirements. */ private const DEFAULT_CACHE_TTL = 8640000; /** * detected eviction policy used on Redis server. */ private string $redisEvictionPolicy; private string $namespace; public function __construct(\Redis|\RedisArray|\RedisCluster|\Predis\ClientInterface|RedisProxy|RedisClusterProxy $redis, string $namespace = '', int $defaultLifetime = 0, MarshallerInterface $marshaller = null) { if ($redis instanceof \Predis\ClientInterface && $redis->getConnection() instanceof ClusterInterface && !$redis->getConnection() instanceof PredisCluster) { throw new InvalidArgumentException(sprintf('Unsupported Predis cluster connection: only "%s" is, "%s" given.', PredisCluster::class, get_debug_type($redis->getConnection()))); } if (\defined('Redis::OPT_COMPRESSION') && ($redis instanceof \Redis || $redis instanceof \RedisArray || $redis instanceof \RedisCluster)) { $compression = $redis->getOption(\Redis::OPT_COMPRESSION); foreach (\is_array($compression) ? $compression : [$compression] as $c) { if (\Redis::COMPRESSION_NONE !== $c) { throw new InvalidArgumentException(sprintf('phpredis compression must be disabled when using "%s", use "%s" instead.', static::class, DeflateMarshaller::class)); } } } $this->init($redis, $namespace, $defaultLifetime, new TagAwareMarshaller($marshaller)); $this->namespace = $namespace; } /** * {@inheritdoc} */ protected function doSave(array $values, int $lifetime, array $addTagData = [], array $delTagData = []): array { $eviction = $this->getRedisEvictionPolicy(); if ('noeviction' !== $eviction && !str_starts_with($eviction, 'volatile-')) { throw new LogicException(sprintf('Redis maxmemory-policy setting "%s" is *not* supported by RedisTagAwareAdapter, use "noeviction" or "volatile-*" eviction policies.', $eviction)); } // serialize values if (!$serialized = $this->marshaller->marshall($values, $failed)) { return $failed; } // While pipeline isn't supported on RedisCluster, other setups will at least benefit from doing this in one op $results = $this->pipeline(static function () use ($serialized, $lifetime, $addTagData, $delTagData, $failed) { // Store cache items, force a ttl if none is set, as there is no MSETEX we need to set each one foreach ($serialized as $id => $value) { yield 'setEx' => [ $id, 0 >= $lifetime ? self::DEFAULT_CACHE_TTL : $lifetime, $value, ]; } // Add and Remove Tags foreach ($addTagData as $tagId => $ids) { if (!$failed || $ids = array_diff($ids, $failed)) { yield 'sAdd' => array_merge([$tagId], $ids); } } foreach ($delTagData as $tagId => $ids) { if (!$failed || $ids = array_diff($ids, $failed)) { yield 'sRem' => array_merge([$tagId], $ids); } } }); foreach ($results as $id => $result) { // Skip results of SADD/SREM operations, they'll be 1 or 0 depending on if set value already existed or not if (is_numeric($result)) { continue; } // setEx results if (true !== $result && (!$result instanceof Status || Status::get('OK') !== $result)) { $failed[] = $id; } } return $failed; } /** * {@inheritdoc} */ protected function doDeleteYieldTags(array $ids): iterable { $lua = <<<'EOLUA' local v = redis.call('GET', KEYS[1]) local e = redis.pcall('UNLINK', KEYS[1]) if type(e) ~= 'number' then redis.call('DEL', KEYS[1]) end if not v or v:len() <= 13 or v:byte(1) ~= 0x9D or v:byte(6) ~= 0 or v:byte(10) ~= 0x5F then return '' end return v:sub(14, 13 + v:byte(13) + v:byte(12) * 256 + v:byte(11) * 65536) EOLUA; $results = $this->pipeline(function () use ($ids, $lua) { foreach ($ids as $id) { yield 'eval' => $this->redis instanceof \Predis\ClientInterface ? [$lua, 1, $id] : [$lua, [$id], 1]; } }); foreach ($results as $id => $result) { if ($result instanceof \RedisException || $result instanceof ErrorInterface) { CacheItem::log($this->logger, 'Failed to delete key "{key}": '.$result->getMessage(), ['key' => substr($id, \strlen($this->namespace)), 'exception' => $result]); continue; } try { yield $id => !\is_string($result) || '' === $result ? [] : $this->marshaller->unmarshall($result); } catch (\Exception $e) { yield $id => []; } } } /** * {@inheritdoc} */ protected function doDeleteTagRelations(array $tagData): bool { $results = $this->pipeline(static function () use ($tagData) { foreach ($tagData as $tagId => $idList) { array_unshift($idList, $tagId); yield 'sRem' => $idList; } }); foreach ($results as $result) { // no-op } return true; } /** * {@inheritdoc} */ protected function doInvalidate(array $tagIds): bool { // This script scans the set of items linked to tag: it empties the set // and removes the linked items. When the set is still not empty after // the scan, it means we're in cluster mode and that the linked items // are on other nodes: we move the links to a temporary set and we // gargage collect that set from the client side. $lua = <<<'EOLUA' redis.replicate_commands() local cursor = '0' local id = KEYS[1] repeat local result = redis.call('SSCAN', id, cursor, 'COUNT', 5000); cursor = result[1]; local rems = {} for _, v in ipairs(result[2]) do local ok, _ = pcall(redis.call, 'DEL', ARGV[1]..v) if ok then table.insert(rems, v) end end if 0 < #rems then redis.call('SREM', id, unpack(rems)) end until '0' == cursor; redis.call('SUNIONSTORE', '{'..id..'}'..id, id) redis.call('DEL', id) return redis.call('SSCAN', '{'..id..'}'..id, '0', 'COUNT', 5000) EOLUA; $results = $this->pipeline(function () use ($tagIds, $lua) { if ($this->redis instanceof \Predis\ClientInterface) { $prefix = $this->redis->getOptions()->prefix ? $this->redis->getOptions()->prefix->getPrefix() : ''; } elseif (\is_array($prefix = $this->redis->getOption(\Redis::OPT_PREFIX) ?? '')) { $prefix = current($prefix); } foreach ($tagIds as $id) { yield 'eval' => $this->redis instanceof \Predis\ClientInterface ? [$lua, 1, $id, $prefix] : [$lua, [$id, $prefix], 1]; } }); $lua = <<<'EOLUA' redis.replicate_commands() local id = KEYS[1] local cursor = table.remove(ARGV) redis.call('SREM', '{'..id..'}'..id, unpack(ARGV)) return redis.call('SSCAN', '{'..id..'}'..id, cursor, 'COUNT', 5000) EOLUA; $success = true; foreach ($results as $id => $values) { if ($values instanceof \RedisException || $values instanceof ErrorInterface) { CacheItem::log($this->logger, 'Failed to invalidate key "{key}": '.$values->getMessage(), ['key' => substr($id, \strlen($this->namespace)), 'exception' => $values]); $success = false; continue; } [$cursor, $ids] = $values; while ($ids || '0' !== $cursor) { $this->doDelete($ids); $evalArgs = [$id, $cursor]; array_splice($evalArgs, 1, 0, $ids); if ($this->redis instanceof \Predis\ClientInterface) { array_unshift($evalArgs, $lua, 1); } else { $evalArgs = [$lua, $evalArgs, 1]; } $results = $this->pipeline(function () use ($evalArgs) { yield 'eval' => $evalArgs; }); foreach ($results as [$cursor, $ids]) { // no-op } } } return $success; } private function getRedisEvictionPolicy(): string { if (isset($this->redisEvictionPolicy)) { return $this->redisEvictionPolicy; } $hosts = $this->getHosts(); $host = reset($hosts); if ($host instanceof \Predis\Client && $host->getConnection() instanceof ReplicationInterface) { // Predis supports info command only on the master in replication environments $hosts = [$host->getClientFor('master')]; } foreach ($hosts as $host) { $info = $host->info('Memory'); if ($info instanceof ErrorInterface) { continue; } $info = $info['Memory'] ?? $info; return $this->redisEvictionPolicy = $info['maxmemory_policy']; } return $this->redisEvictionPolicy = ''; } }